git-svn-id: http://webrtc.googlecode.com/svn/trunk@4 4adac7df-926f-26a2-2b94-8c16560cd09d

modules/video_processing/main/OWNERS

@@ -0,0 +1,4 @@
+holmer@google.com
+mikhal@google.com
+marpan@google.com
+hlundin@google.com

modules/video_processing/main/interface/video_processing.h

@@ -0,0 +1,379 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * video_processing.h
+ * This header file contains the API required for the video
+ * processing module class.
+ */
+
+
+#ifndef WEBRTC_MODULES_INTERFACE_VIDEO_PROCESSING_H
+#define WEBRTC_MODULES_INTERFACE_VIDEO_PROCESSING_H
+
+#include "module.h"
+#include "module_common_types.h"
+#include "video_processing_defines.h"
+
+/**
+   The module is largely intended to process video streams, except functionality 
+   provided by static functions which operate independent of previous frames. It
+   is recommended, but not required that a unique instance be used for each 
+   concurrently processed stream. Similarly, it is recommended to call Reset()
+   before switching to a new stream, but this is not absolutely required.
+   
+   The module provides basic thread safety by permitting only a single function to
+   execute concurrently.
+*/
+
+namespace webrtc {
+
+class VideoProcessingModule : public Module
+{
+public:
+    /**
+       Structure to hold frame statistics. Populate it with GetFrameStats().
+    */
+    struct FrameStats
+    {
+        FrameStats() :
+            mean(0),
+            sum(0),
+            numPixels(0),
+            subSamplWidth(0),
+            subSamplHeight(0)
+        {
+            memset(hist, 0, sizeof(hist));
+        }
+
+        WebRtc_UWord32 hist[256];      /**< Histogram of frame */
+        WebRtc_UWord32 mean;           /**< Mean value of frame */
+        WebRtc_UWord32 sum;            /**< Sum of frame */
+        WebRtc_UWord32 numPixels;      /**< Number of pixels */
+        WebRtc_UWord8  subSamplWidth;  /**< Subsampling rate of width in powers of 2 */
+        WebRtc_UWord8  subSamplHeight; /**< Subsampling rate of height in powers of 2 */
+    };
+
+    /**
+       Specifies the warning types returned by BrightnessDetection().
+    */
+    enum BrightnessWarning 
+    {
+        kNoWarning,                /**< Frame has acceptable brightness */
+        kDarkWarning,              /**< Frame is too dark */
+        kBrightWarning            /**< Frame is too bright */
+    };
+
+    /*
+       Creates a VPM object.
+      
+       \param[in] id
+           Unique identifier of this object.
+      
+       \return Pointer to a VPM object.
+    */
+    static VideoProcessingModule* Create(WebRtc_Word32 id);
+
+    /**
+       Destroys a VPM object.
+      
+       \param[in] module
+           Pointer to the VPM object to destroy.
+    */
+    static void Destroy(VideoProcessingModule* module);
+
+    /**
+       Retrieves the version of the module and its components.
+      
+       \param[in,out] version
+           Buffer to which the null-terminated version string will be copied.
+      
+       \param[in,out] remainingBufferInBytes 
+           Bytes remaining between the supplied position and the end of the buffer.
+           This will reflect the new remaining size at return.
+       
+       \param[in,out] position
+           Position in bytes within the buffer to place the version string. This 
+           will reflect the first byte position following the version string at 
+           return. 
+      
+       \return 0 on success, -1 on failure.
+    */
+    static WebRtc_Word32 GetVersion(WebRtc_Word8* version,
+                                  WebRtc_UWord32& remainingBufferInBytes,
+                                  WebRtc_UWord32& position);
+
+    /**
+       Not supported.
+    */
+    virtual WebRtc_Word32 TimeUntilNextProcess() { return -1; }
+
+    /**
+       Not supported.
+    */
+    virtual WebRtc_Word32 Process() { return -1; }
+
+    /**
+       Resets all processing components to their initial states. This should be
+       called whenever a new video stream is started.
+    */
+    virtual void Reset() = 0;
+
+    /**
+       Retrieves statistics for the input frame. This function must be used to
+       prepare a FrameStats struct for use in certain VPM functions.
+      
+       \param[out] stats
+           The frame statistics will be stored here on return.
+      
+       \param[in]  frame
+           Pointer to the video frame.
+      
+       \param[in]  width
+           Frame width in pixels.
+      
+       \param[in]  height
+           Frame height in pixels.
+      
+       \return 0 on success, -1 on failure.
+    */
+    static WebRtc_Word32 GetFrameStats(FrameStats& stats,
+                                     const WebRtc_UWord8* frame,
+                                     WebRtc_UWord32 width,
+                                     WebRtc_UWord32 height);
+
+    /**
+       \overload
+    */
+     static WebRtc_Word32 GetFrameStats(FrameStats& stats,
+                                     const VideoFrame& frame);
+
+    /**
+       Checks the validity of a FrameStats struct. Currently, valid implies only
+       that is had changed from its initialized state.
+      
+       \param[in] stats
+           Frame statistics.
+      
+       \return True on valid stats, false on invalid stats.
+    */
+    static bool ValidFrameStats(const FrameStats& stats);
+
+    /**
+       Returns a FrameStats struct to its intialized state.
+      
+       \param[in,out] stats
+           Frame statistics.
+    */
+    static void ClearFrameStats(FrameStats& stats);
+
+    /**
+       Enhances the color of an image through a constant mapping. Only the 
+       chrominance is altered. Has a fixed-point implementation.
+      
+       \param[in,out] frame
+           Pointer to the video frame.
+      
+       \param[in]     width
+           Frame width in pixels.
+      
+       \param[in]     height
+           Frame height in pixels.
+      
+       \return 0 on success, -1 on failure.
+    */
+    static WebRtc_Word32 ColorEnhancement(WebRtc_UWord8* frame,
+                                        WebRtc_UWord32 width,
+                                        WebRtc_UWord32 height);
+
+    /**
+       \overload
+    */
+    static WebRtc_Word32 ColorEnhancement(VideoFrame& frame);
+
+    /**
+       Detects and removes camera flicker from a video stream. Every frame from the
+       stream must be passed in. A frame will only be altered if flicker has been
+       detected. Has a fixed-point implementation.
+      
+       \param[in,out] frame
+           Pointer to the video frame.
+      
+       \param[in]     width
+           Frame width in pixels.
+      
+       \param[in]     height
+           Frame height in pixels.
+      
+       \param[in]     timestamp
+           Frame timestamp in 90 kHz format.
+      
+       \param[in,out] stats
+           Frame statistics provided by GetFrameStats(). On return the stats will
+           be reset to zero if the frame was altered. Call GetFrameStats() again
+           if the statistics for the altered frame are required.
+      
+       \return 0 on success, -1 on failure.
+    */
+    virtual WebRtc_Word32 Deflickering(WebRtc_UWord8* frame,
+                                     WebRtc_UWord32 width,
+                                     WebRtc_UWord32 height,
+                                     WebRtc_UWord32 timestamp,
+                                     FrameStats& stats) = 0;
+    
+    /**
+       \overload
+    */
+    virtual WebRtc_Word32 Deflickering(VideoFrame& frame,
+                                     FrameStats& stats) = 0;
+
+    /**
+       Denoises a video frame. Every frame from the stream should be passed in.
+       Has a fixed-point implementation.
+      
+       \param[in,out] frame
+           Pointer to the video frame.
+      
+       \param[in]     width
+           Frame width in pixels.
+      
+       \param[in]     height
+           Frame height in pixels.
+      
+       \return The number of modified pixels on success, -1 on failure.
+    */
+    virtual WebRtc_Word32 Denoising(WebRtc_UWord8* frame,
+                                  WebRtc_UWord32 width,
+                                  WebRtc_UWord32 height) = 0;
+    
+    /**
+       \overload
+    */
+    virtual WebRtc_Word32 Denoising(VideoFrame& frame) = 0;
+
+    /**
+       Detects if a video frame is excessively bright or dark. Returns a warning if
+       this is the case. Multiple frames should be passed in before expecting a 
+       warning. Has a floating-point implementation.
+      
+       \param[in] frame
+           Pointer to the video frame.
+      
+       \param[in]     width
+           Frame width in pixels.
+      
+       \param[in]     height
+           Frame height in pixels.
+      
+       \param[in] stats
+           Frame statistics provided by GetFrameStats().
+      
+       \return A member of BrightnessWarning on success, -1 on error
+    */
+    virtual WebRtc_Word32 BrightnessDetection(const WebRtc_UWord8* frame,
+                                            WebRtc_UWord32 width,
+                                            WebRtc_UWord32 height,
+                                            const FrameStats& stats) = 0;
+
+    /**
+       \overload
+    */
+    virtual WebRtc_Word32 BrightnessDetection(const VideoFrame& frame,
+                                            const FrameStats& stats) = 0;
+
+
+    /**
+    The following functions refer to the pre-processor unit within VPM. The pre-processor
+    perfoms spatial/temporal decimation and content analysis on the frames prior to encoding.
+    */
+	
+    /**
+    Enable/disable temporal decimation
+
+    \param[in] enable when true, temporal decimation is enabled
+    */
+    virtual void EnableTemporalDecimation(bool enable) = 0;
+	
+    /**
+   Set target resolution
+    
+   \param[in] width
+   Target width
+    
+   \param[in] height
+   Target height
+    
+    \param[in] frameRate
+    Target frameRate
+           
+    \return VPM_OK on success, a negative value on error (see error codes)
+
+    */
+    virtual WebRtc_Word32 SetTargetResolution(WebRtc_UWord32 width, WebRtc_UWord32 height, WebRtc_UWord32 frameRate) = 0;
+    
+    /**
+    Set max frame rate
+    \param[in] maxFrameRate: maximum frame rate (limited to native frame rate)
+
+    \return VPM_OK on success, a negative value on error (see error codes)
+    */
+    virtual WebRtc_Word32 SetMaxFrameRate(WebRtc_UWord32 maxFrameRate) = 0;
+
+    /**
+    Get decimated(target) frame rate
+    */
+    virtual WebRtc_UWord32 DecimatedFrameRate() = 0;
+	
+    /**
+    Get decimated(target) frame width
+    */
+    virtual WebRtc_UWord32 DecimatedWidth() const = 0;
+
+    /**
+    Get decimated(target) frame height
+    */
+    virtual WebRtc_UWord32 DecimatedHeight() const = 0 ;
+
+    /**
+    Set the spatial resampling settings of the VPM: The resampler may either be disabled or one of the following:
+    scaling to a close to target dimension followed by crop/pad
+
+    \param[in] resamplingMode
+    Set resampling mode (a member of VideoFrameResampling)
+    */
+    virtual void SetInputFrameResampleMode(VideoFrameResampling resamplingMode) = 0;
+  
+    /**
+    Get Processed (decimated) frame
+	  
+    \param[in] frame pointer to the video frame.
+	  
+	  \param[in] processedFrame pointer (double) to the processed frame
+    
+    \return VPM_OK on success, a negative value on error (see error codes)
+    */
+    virtual WebRtc_Word32 PreprocessFrame(const VideoFrame* frame, VideoFrame** processedFrame) = 0;
+
+    /**
+    Return content metrics for the last processed frame
+    */
+    virtual VideoContentMetrics* ContentMetrics() const = 0 ;
+
+    /**
+    Enable content analysis
+    */
+    virtual void EnableContentAnalysis(bool enable) = 0;
+
+};
+
+} //namespace
+
+#endif
+

modules/video_processing/main/interface/video_processing_defines.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * video_processing_defines.h
+ * This header file includes the definitions used in the video processor module
+ */
+
+#ifndef WEBRTC_MODULES_INTERFACE_VIDEO_PROCESSING_DEFINES_H
+#define WEBRTC_MODULES_INTERFACE_VIDEO_PROCESSING_DEFINES_H
+
+#include "typedefs.h"
+
+namespace webrtc {
+
+// Error codes
+#define VPM_OK                   0
+#define VPM_GENERAL_ERROR       -1
+#define VPM_MEMORY              -2
+#define VPM_PARAMETER_ERROR     -3
+#define VPM_UNINITIALIZED       -4
+#define VPM_UNIMPLEMENTED       -5
+
+enum VideoFrameResampling
+{
+    kNoRescaling,         // disables rescaling
+    kFastRescaling,       // fast up/down scaling; crop/pad when needed.
+    kBiLinear,            // bi-linear interpolation
+};
+
+} //namespace
+
+#endif

modules/video_processing/main/source/brightness_detection.cc

@@ -0,0 +1,195 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "video_processing.h"
+#include "brightness_detection.h"
+#include "trace.h"
+
+#include <math.h>
+
+namespace webrtc {
+
+VPMBrightnessDetection::VPMBrightnessDetection() :
+    _id(0)
+{
+    Reset();
+}
+
+VPMBrightnessDetection::~VPMBrightnessDetection()
+{
+}
+
+WebRtc_Word32
+VPMBrightnessDetection::ChangeUniqueId(const WebRtc_Word32 id)
+{
+    _id = id;
+    return VPM_OK;
+}
+
+void
+VPMBrightnessDetection::Reset()
+{
+    _frameCntBright = 0;
+    _frameCntDark = 0;
+}
+
+WebRtc_Word32
+VPMBrightnessDetection::ProcessFrame(const WebRtc_UWord8* frame,
+                                     const WebRtc_UWord32 width,
+                                     const WebRtc_UWord32 height,
+                                     const VideoProcessingModule::FrameStats& stats)
+{
+    if (frame == NULL)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Null frame pointer");
+        return VPM_PARAMETER_ERROR;
+    }
+    
+    if (width == 0 || height == 0)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Invalid frame size");
+        return VPM_PARAMETER_ERROR;
+    }
+
+    if (!VideoProcessingModule::ValidFrameStats(stats))
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Invalid frame stats");
+        return VPM_PARAMETER_ERROR;
+    }
+
+    const WebRtc_UWord8 frameCntAlarm = 2;
+
+    // Get proportion in lowest bins 
+    WebRtc_UWord8 lowTh = 20;
+    float propLow = 0;
+    for (WebRtc_UWord32 i = 0; i < lowTh; i++)
+    {
+        propLow += stats.hist[i];
+    }
+    propLow /= stats.numPixels;
+
+    // Get proportion in highest bins 
+    unsigned char highTh = 230;
+    float propHigh = 0;
+    for (WebRtc_UWord32 i = highTh; i < 256; i++)
+    {
+        propHigh += stats.hist[i];
+    }
+    propHigh /= stats.numPixels;
+
+    if(propHigh < 0.4)
+    {
+        if (stats.mean < 90 || stats.mean > 170)
+        {
+            // Standard deviation of Y
+            float stdY = 0;
+            for (WebRtc_UWord32 h = 0; h < height; h += (1 << stats.subSamplHeight))
+            {
+                WebRtc_UWord32 row = h*width;
+                for (WebRtc_UWord32 w = 0; w < width; w += (1 << stats.subSamplWidth))
+                {
+                    stdY += (frame[w + row] - stats.mean) * (frame[w + row] - stats.mean);
+                }
+            }           
+            stdY = sqrt(stdY / stats.numPixels);
+
+            // Get percentiles
+            WebRtc_UWord32 sum = 0;
+            WebRtc_UWord32 medianY = 140;
+            WebRtc_UWord32 perc05 = 0;
+            WebRtc_UWord32 perc95 = 255;
+            float posPerc05 = stats.numPixels * 0.05f;
+            float posMedian = stats.numPixels * 0.5f;
+            float posPerc95 = stats.numPixels * 0.95f;
+            for (WebRtc_UWord32 i = 0; i < 256; i++)
+            {
+                sum += stats.hist[i];
+
+                if (sum < posPerc05)
+                {
+                    perc05 = i;     // 5th perc
+                }
+                if (sum < posMedian)
+                {
+                    medianY = i;    // 50th perc
+                }
+                if (sum < posPerc95)
+                {
+                    perc95 = i;     // 95th perc
+                }
+                else
+                {
+                    break;
+                }
+            }
+
+            // Check if image is too dark
+            if ((stdY < 55) && (perc05 < 50))
+            { 
+                if (medianY < 60 || stats.mean < 80 ||  perc95 < 130 || propLow > 0.20)
+                {
+                    _frameCntDark++;
+                }
+                else
+                {
+                    _frameCntDark = 0;
+                }
+            } 
+            else
+            {
+                _frameCntDark = 0;
+            }
+
+            // Check if image is too bright
+            if ((stdY < 52) && (perc95 > 200) && (medianY > 160))
+            {
+                if (medianY > 185 || stats.mean > 185 || perc05 > 140 || propHigh > 0.25)
+                {
+                    _frameCntBright++;  
+                }
+                else 
+                {
+                    _frameCntBright = 0;
+                }
+            } 
+            else
+            {
+                _frameCntBright = 0;
+            }
+
+        } 
+        else
+        {
+            _frameCntDark = 0;
+            _frameCntBright = 0;
+        }
+
+    } 
+    else
+    {
+        _frameCntBright++;
+        _frameCntDark = 0;
+    }
+    
+    if (_frameCntDark > frameCntAlarm)
+    {
+        return VideoProcessingModule::kDarkWarning;
+    }
+    else if (_frameCntBright > frameCntAlarm)
+    {
+        return VideoProcessingModule::kBrightWarning;
+    }
+    else
+    {
+        return VideoProcessingModule::kNoWarning;
+    }
+}
+
+} //namespace

modules/video_processing/main/source/brightness_detection.h

@@ -0,0 +1,46 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * brightness_detection.h
+ */
+#ifndef VPM_BRIGHTNESS_DETECTION_H
+#define VPM_BRIGHTNESS_DETECTION_H
+
+#include "typedefs.h"
+#include "video_processing.h"
+
+namespace webrtc {
+
+class VPMBrightnessDetection
+{
+public:
+    VPMBrightnessDetection();
+    ~VPMBrightnessDetection();
+
+    WebRtc_Word32 ChangeUniqueId(WebRtc_Word32 id);
+
+    void Reset();
+
+    WebRtc_Word32 ProcessFrame(const WebRtc_UWord8* frame,
+                             WebRtc_UWord32 width,
+                             WebRtc_UWord32 height,
+                             const VideoProcessingModule::FrameStats& stats);
+
+private:
+    WebRtc_Word32 _id;
+
+    WebRtc_UWord32 _frameCntBright;
+    WebRtc_UWord32 _frameCntDark;
+};
+
+} //namespace
+
+#endif // VPM_BRIGHTNESS_DETECTION_H

modules/video_processing/main/source/color_enhancement.cc

@@ -0,0 +1,68 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "color_enhancement.h"
+#include "color_enhancement_private.h"
+#include "trace.h"
+#include <cstdlib>  // NULL
+
+namespace webrtc {
+
+namespace VideoProcessing
+{ 
+    WebRtc_Word32
+    ColorEnhancement(WebRtc_UWord8* frame,
+                     const WebRtc_UWord32 width,
+                     const WebRtc_UWord32 height)
+    {
+        // pointers to U and V color pixels
+        WebRtc_UWord8* ptrU;
+        WebRtc_UWord8* ptrV;
+        WebRtc_UWord8 tempChroma;
+        const WebRtc_UWord32 numPixels = width * height;
+
+
+        if (frame == NULL)
+        {
+            WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1, "Null frame pointer");
+            return VPM_GENERAL_ERROR;
+        }
+
+        if (width == 0 || height == 0)
+        {
+            WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1, "Invalid frame size");
+            return VPM_GENERAL_ERROR;
+        }
+        
+        // set pointers to first U and V pixels
+        
+        // stream format:
+        // | numPixels bytes luminance | numPixels/4 bytes chroma U | numPixels/4 chroma V |
+        
+        ptrU = frame + numPixels;       // skip luminance
+        ptrV = ptrU + (numPixels>>2);
+
+        // loop through all chrominance pixels and modify color
+        for (WebRtc_UWord32 ix = 0; ix < (numPixels>>2); ix++)
+        {
+            tempChroma = colorTable[*ptrU][*ptrV];
+            *ptrV = colorTable[*ptrV][*ptrU];
+            *ptrU = tempChroma;
+            
+            // increment pointers
+            ptrU++;
+            ptrV++;
+        }
+        return VPM_OK;
+    }
+
+} //namespace
+
+} //namespace webrtc

modules/video_processing/main/source/color_enhancement.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * color_enhancement.h
+ */
+#ifndef VPM_COLOR_ENHANCEMENT_H
+#define VPM_COLOR_ENHANCEMENT_H
+
+#include "typedefs.h"
+#include "video_processing.h"
+
+namespace webrtc {
+
+namespace VideoProcessing
+{
+    WebRtc_Word32 ColorEnhancement(WebRtc_UWord8* frame,
+                                 WebRtc_UWord32 width,
+                                 WebRtc_UWord32 height);
+}
+
+} //namespace
+
+#endif // VPM_COLOR_ENHANCEMENT_H

modules/video_processing/main/source/color_enhancement_private.h

@@ -0,0 +1,273 @@
+#ifndef VPM_COLOR_ENHANCEMENT_PRIVATE_H
+#define VPM_COLOR_ENHANCEMENT_PRIVATE_H
+
+#include "typedefs.h"
+
+namespace webrtc {
+
+//Table created with Matlab script createTable.m
+//Usage:
+//    Umod=colorTable[U][V]
+//    Vmod=colorTable[V][U]
+static const WebRtc_UWord8 colorTable[256][256] = {
+    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
+    {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
+    {2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2},
+    {3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3},
+    {4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4},
+    {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5},
+    {6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6},
+    {7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7},
+    {8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8},
+    {9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9},
+    {10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10},
+    {11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11},
+    {12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12},
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+    {247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247, 247},
+    {248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248, 248},
+    {249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249, 249},
+    {250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250, 250},
+    {251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251, 251},
+    {252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252},
+    {253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253, 253},
+    {254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254, 254},
+    {255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}
+};
+
+} //namespace
+
+#endif // VPM_COLOR_ENHANCEMENT_PRIVATE_H

modules/video_processing/main/source/content_analysis.cc

@@ -0,0 +1,336 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "content_analysis.h"
+#include "tick_util.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+namespace webrtc {
+
+VPMContentAnalysis::VPMContentAnalysis():
+_origFrame(NULL),
+_prevFrame(NULL),
+_firstFrame(true),
+_width(0),
+_height(0),
+_motionMagnitudeNZ(0.0f),
+_spatialPredErr(0.0f),
+_spatialPredErrH(0.0f),
+_spatialPredErrV(0.0f),
+_sizeZeroMotion(0.0f),
+_motionPredErr(0.0f),
+_motionHorizontalness(0.0f),
+_motionClusterDistortion(0.0f),
+_CAInit(false),
+_cMetrics(NULL)
+{
+    Release();
+}
+
+VPMContentAnalysis::~VPMContentAnalysis()
+{
+    Release();
+}
+
+
+
+VideoContentMetrics*
+VPMContentAnalysis::ComputeContentMetrics(const VideoFrame* inputFrame)
+{
+    if (inputFrame == NULL)
+    {
+        return NULL;
+    }
+
+    //Init if needed (native dimension change)
+    if (_width != inputFrame->Width() || _height != inputFrame->Height())
+    {
+        Initialize((WebRtc_UWord16)inputFrame->Width(), (WebRtc_UWord16)inputFrame->Height());
+    }
+
+    _origFrame = inputFrame->Buffer();
+
+    //compute spatial metrics: 3 spatial prediction errors
+    ComputeSpatialMetrics();
+
+    //compute motion metrics
+    if (_firstFrame == false)
+        ComputeMotionMetrics();
+
+   // saving current frame as previous one: Y only
+   memcpy(_prevFrame, _origFrame, _width * _height);
+
+   _firstFrame =  false;
+   _CAInit = true;
+
+    return ContentMetrics();
+}
+
+WebRtc_Word32
+VPMContentAnalysis::Release()
+{
+    if (_cMetrics != NULL)
+    {
+        delete _cMetrics;
+       _cMetrics = NULL;
+    }
+
+    if (_prevFrame != NULL)
+    {
+        delete [] _prevFrame;
+        _prevFrame = NULL;
+    }
+
+    _width = 0;
+    _height = 0;
+    _firstFrame = true;
+
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMContentAnalysis::Initialize(WebRtc_UWord16 width, WebRtc_UWord16 height)
+{
+   _width = width;
+   _height = height;
+   _firstFrame = true;
+
+    if (_cMetrics != NULL)
+    {
+        delete _cMetrics;
+    }
+    _cMetrics = new VideoContentMetrics();
+    if (_cMetrics == NULL)
+    {
+        return VPM_MEMORY;
+    }
+
+    if (_prevFrame != NULL)
+    {
+        delete [] _prevFrame;
+    }
+    _prevFrame = new WebRtc_UWord8[_width * _height] ; // Y only
+    if (_prevFrame == NULL)
+    {
+        return VPM_MEMORY;
+    }
+
+    return VPM_OK;
+}
+
+
+//Compute motion metrics: magnitude over non-zero motion vectors, and size of zero cluster
+WebRtc_Word32
+VPMContentAnalysis::ComputeMotionMetrics()
+{
+
+    //Motion metrics: only one is derived from normalized  (MAD) temporal difference
+    TemporalDiffMetric();
+
+	  return VPM_OK;
+}
+
+
+//Normalized temporal difference (MAD): used as a motion level metric
+//Normalize MAD by spatial contrast: images with more contrast (pixel variance) likely have larger temporal difference
+//To reduce complexity, we compute the metric for a reduced set of points.
+WebRtc_Word32
+VPMContentAnalysis::TemporalDiffMetric()
+{
+
+    //size of original frame
+    WebRtc_UWord16 sizei = _height;
+    WebRtc_UWord16 sizej = _width;
+
+    //skip parameter: # of skipped pixels along x & y direction: for complexity reduction
+    WebRtc_UWord8 skipNum = 1; // 1 == all pixels, 2 == 1/4 reduction, 3 == 1/9 reduction
+
+    //use skipNum = 2 for 4CIF, WHD
+    if ( (sizei >=  576) && (sizej >= 704) )
+    {
+        skipNum = 2;
+    }
+    //use skipNum = 3 for FULLL_HD images
+    if ( (sizei >=  1080) && (sizej >= 1920) )
+    {
+        skipNum = 3;
+    }
+
+    float contrast = 0.0f;
+    float tempDiffAvg = 0.0f;
+    float pixelSumAvg = 0.0f;
+    float pixelSqSumAvg = 0.0f;
+
+    WebRtc_UWord32 tempDiffSum = 0;
+    WebRtc_UWord32 pixelSum = 0;
+    WebRtc_UWord32 pixelSqSum = 0;
+
+    WebRtc_UWord8 bord = 8; //avoid boundary
+    WebRtc_UWord32 numPixels = 0; //counter for # of pixels
+    WebRtc_UWord32 ssn;
+
+    for(WebRtc_UWord16 i = bord; i < sizei - bord; i += skipNum)
+    for(WebRtc_UWord16 j = bord; j < sizej - bord; j += skipNum)
+    {
+        numPixels += 1;
+        ssn =  i * sizej + j;
+
+        WebRtc_UWord8 currPixel  = _origFrame[ssn];
+        WebRtc_UWord8 prevPixel  = _prevFrame[ssn];
+
+        tempDiffSum += (WebRtc_UWord32) abs((WebRtc_Word16)(currPixel - prevPixel));
+        pixelSum += (WebRtc_UWord32) _origFrame[ssn];
+        pixelSqSum += (WebRtc_UWord32) (_origFrame[ssn] * _origFrame[ssn]);
+    }
+
+    //default
+    _motionMagnitudeNZ = 0.0f;
+
+    if (tempDiffSum == 0)
+    {
+        return VPM_OK;
+    }
+
+    //normalize over all pixels
+    tempDiffAvg = (float)tempDiffSum / (float)(numPixels);
+    pixelSumAvg = (float)pixelSum / (float)(numPixels);
+    pixelSqSumAvg = (float)pixelSqSum / (float)(numPixels);
+    contrast = pixelSqSumAvg - (pixelSumAvg * pixelSumAvg);
+
+    if (contrast > 0.0)
+    {
+        contrast = sqrt(contrast);
+       _motionMagnitudeNZ = tempDiffAvg/contrast;
+    }
+
+    return VPM_OK;
+
+}
+
+
+//Compute spatial metrics: 
+//To reduce complexity, we compute the metric for a reduced set of points.
+//The spatial metrics are rough estimates of the prediction error cost for each QM spatial mode: 2x2,1x2,2x1
+//The metrics are a simple estimate of the up-sampling prediction error, estimated assuming sub-sampling for decimation (no filtering),
+//and up-sampling back up with simple bilinear interpolation.
+WebRtc_Word32
+VPMContentAnalysis::ComputeSpatialMetrics()
+{
+    //size of original frame
+    WebRtc_UWord16 sizei = _height;
+    WebRtc_UWord16 sizej = _width;
+
+    //skip parameter: # of skipped pixels along x & y direction: for complexity reduction
+    WebRtc_UWord8 skipNum = 1; // 1 == all pixels, 2 == 1/4 reduction, 3 == 1/9 reduction
+
+    //use skipNum = 2 for 4CIF, WHD
+    if ( (sizei >=  576) && (sizej >= 704) )
+    {
+        skipNum = 2;
+    }
+    //use skipNum = 3 for FULLL_HD images
+    if ( (sizei >=  1080) && (sizej >= 1920) )
+    {
+        skipNum = 3;
+    }
+
+    float spatialErr = 0.0f;
+    float spatialErrH = 0.0f;
+    float spatialErrV = 0.0f;
+
+    //pixel mean square average: used to normalize the spatial metrics
+    float pixelMSA = 0;
+    float norm = 1.0f;
+
+    WebRtc_UWord8 bord = 8; //avoid boundary
+    WebRtc_UWord32 numPixels = 0; //counter for # of pixels
+
+    WebRtc_UWord32 ssn1,ssn2,ssn3,ssn4,ssn5;
+
+    WebRtc_UWord32 spatialErrSum = 0;
+    WebRtc_UWord32 spatialErrVSum = 0;
+    WebRtc_UWord32 spatialErrHSum = 0;
+
+    for(WebRtc_UWord16 i = bord; i < sizei - bord; i += skipNum)
+    for(WebRtc_UWord16 j = bord; j < sizej - bord; j += skipNum)
+    {
+        numPixels += 1;
+        ssn1=  i * sizej + j;
+        ssn2 = (i + 1) * sizej + j;	//bottom
+        ssn3 = (i - 1) * sizej + j; //top
+        ssn4 = i * sizej + j + 1;	//right
+        ssn5 = i * sizej + j - 1;	//left
+
+        WebRtc_UWord16 refPixel1  = _origFrame[ssn1] << 1;
+        WebRtc_UWord16 refPixel2  = _origFrame[ssn1] << 2;
+
+        WebRtc_UWord8 bottPixel = _origFrame[ssn2];
+        WebRtc_UWord8 topPixel = _origFrame[ssn3];
+        WebRtc_UWord8 rightPixel = _origFrame[ssn4];
+        WebRtc_UWord8 leftPixel = _origFrame[ssn5];
+
+        spatialErrSum +=  (WebRtc_UWord32) abs((WebRtc_Word16)(refPixel2 - (WebRtc_UWord16)(bottPixel + topPixel + leftPixel + rightPixel)));
+        spatialErrVSum +=  (WebRtc_UWord32) abs((WebRtc_Word16)(refPixel1 - (WebRtc_UWord16)(bottPixel + topPixel)));
+        spatialErrHSum +=  (WebRtc_UWord32) abs((WebRtc_Word16)(refPixel1 - (WebRtc_UWord16)(leftPixel + rightPixel)));
+
+        pixelMSA += (float)_origFrame[ssn1];
+    }
+
+    //normalize over all pixels
+    spatialErr = (float)spatialErrSum / (float)(4 * numPixels);
+    spatialErrH = (float)spatialErrHSum / (float)(2 * numPixels);
+    spatialErrV = (float)spatialErrVSum / (float)(2 * numPixels);
+    norm = (float)pixelMSA / float(numPixels);
+
+   
+    //normalize to RMS pixel level: use avg pixel level for now
+
+    //2X2:
+    _spatialPredErr = spatialErr / (norm);
+
+    //1X2:
+    _spatialPredErrH = spatialErrH / (norm);
+
+    //2X1:
+    _spatialPredErrV = spatialErrV / (norm);
+
+
+    return VPM_OK;
+}
+
+
+VideoContentMetrics*
+VPMContentAnalysis::ContentMetrics()
+{
+    if (_CAInit == false)
+    {
+        return NULL;
+    }
+
+
+    _cMetrics->spatialPredErr = _spatialPredErr;
+    _cMetrics->spatialPredErrH = _spatialPredErrH;
+    _cMetrics->spatialPredErrV = _spatialPredErrV;
+    //normalized temporal difference (MAD)
+    _cMetrics->motionMagnitudeNZ = _motionMagnitudeNZ;
+
+    //Set to zero: not computed
+    _cMetrics->motionPredErr = _motionPredErr;
+    _cMetrics->sizeZeroMotion = _sizeZeroMotion;
+    _cMetrics->motionHorizontalness = _motionHorizontalness;
+    _cMetrics->motionClusterDistortion = _motionClusterDistortion;
+
+    return _cMetrics;
+
+}
+
+} //namespace

modules/video_processing/main/source/content_analysis.h

@@ -0,0 +1,84 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * content_analysis.h
+ */
+
+#ifndef VPM_CONTENT_ANALYSIS_H
+#define VPM_CONTENT_ANALYSIS_H
+
+#include "typedefs.h"
+#include "module_common_types.h"
+
+#include "spatial_resampler.h"
+
+namespace webrtc {
+
+class VPMContentAnalysis
+{
+public:
+    VPMContentAnalysis();
+    ~VPMContentAnalysis();
+
+    //Initialize ContentAnalysis - should be called prior to extractContentFeature
+    //Inputs:	   width, height
+    //Return value:   0 if OK, negative value upon error
+    WebRtc_Word32 Initialize( WebRtc_UWord16 width,  WebRtc_UWord16 height);
+	
+    //Extract content Feature - main function of ContentAnalysis
+    //Input:		new frame
+    //Return value:    pointer to structure containing content Analysis metrics or NULL value upon error
+    VideoContentMetrics* ComputeContentMetrics(const VideoFrame* inputFrame);
+
+    //Release all allocated memory
+    //Output: 0 if OK, negative value upon error
+    WebRtc_Word32 Release();
+
+private:
+
+    //return motion metrics
+    VideoContentMetrics* ContentMetrics();
+
+    //Normalized temporal difference metric: for motion magnitude
+    WebRtc_Word32 TemporalDiffMetric();
+
+    //Motion metric method: call 2 metrics (magnitude and size)
+    WebRtc_Word32 ComputeMotionMetrics();
+
+    //Spatial metric method: computes the 3 frame-average spatial prediction errors (1x2,2x1,2x2)
+    WebRtc_Word32 ComputeSpatialMetrics();
+
+    const WebRtc_UWord8*       _origFrame;
+    WebRtc_UWord8*             _prevFrame;
+    WebRtc_UWord16             _width;
+    WebRtc_UWord16             _height;
+
+
+    //Content Metrics:
+    //stores the local average of the metrics
+    float                  _motionMagnitudeNZ;  //for motion class
+    float                  _spatialPredErr;    //for spatial class
+    float                  _spatialPredErrH;   //for spatial class
+    float                  _spatialPredErrV;   //for spatial class
+    float                  _sizeZeroMotion;     //for motion class
+    float                  _motionPredErr;     //for complexity class:
+    float                  _motionHorizontalness;    //for coherence class
+    float                  _motionClusterDistortion;  //for coherence class
+
+    bool                   _firstFrame;
+    bool                   _CAInit;
+    VideoContentMetrics*   _cMetrics;
+
+}; // end of VPMContentAnalysis class definition
+
+} // namespace
+
+#endif

modules/video_processing/main/source/deflickering.cc

@@ -0,0 +1,445 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "deflickering.h"
+#include "trace.h"
+#include "signal_processing_library.h"
+#include "sort.h"
+
+namespace webrtc {
+
+// Detection constants
+enum { kFrequencyDeviation = 39 };      // (Q4) Maximum allowed deviation for detection
+enum { kMinFrequencyToDetect = 32 };    // (Q4) Minimum frequency that can be detected
+enum { kNumFlickerBeforeDetect = 2 };   // Number of flickers before we accept detection
+enum { kMeanValueScaling = 4 };         // (Q4) In power of 2
+enum { kZeroCrossingDeadzone = 10 };    // Deadzone region in terms of pixel values
+
+// Deflickering constants
+// Compute the quantiles over 1 / DownsamplingFactor of the image.
+enum { kDownsamplingFactor = 8 };
+enum { kLog2OfDownsamplingFactor = 3 };
+
+// To generate in Matlab:
+// >> probUW16 = round(2^11 * [0.05,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,0.95,0.97]);
+// >> fprintf('%d, ', probUW16)
+// Resolution reduced to avoid overflow when multiplying with the (potentially) large 
+// number of pixels.
+const WebRtc_UWord16 VPMDeflickering::_probUW16[kNumProbs] =
+    {102, 205, 410, 614, 819, 1024, 1229, 1434, 1638, 1843, 1946, 1987}; // <Q11>
+
+// To generate in Matlab:
+// >> numQuants = 14; maxOnlyLength = 5;
+// >> weightUW16 = round(2^15 * [linspace(0.5, 1.0, numQuants - maxOnlyLength)]);
+// >> fprintf('%d, %d,\n ', weightUW16);
+const WebRtc_UWord16 VPMDeflickering::_weightUW16[kNumQuants - kMaxOnlyLength] =
+    {16384, 18432, 20480, 22528, 24576, 26624, 28672, 30720, 32768}; // <Q15>
+ 
+VPMDeflickering::VPMDeflickering() :
+    _id(0)
+{
+    Reset();
+}
+
+VPMDeflickering::~VPMDeflickering()
+{
+}
+
+WebRtc_Word32
+VPMDeflickering::ChangeUniqueId(const WebRtc_Word32 id)
+{
+    _id = id;
+    return 0;
+}
+
+void
+VPMDeflickering::Reset()
+{
+    _meanBufferLength = 0;
+    _detectionState = 0;
+    _frameRate = 0;
+
+    memset(_meanBuffer, 0, sizeof(WebRtc_Word32) * kMeanBufferLength);
+    memset(_timestampBuffer, 0, sizeof(WebRtc_Word32) * kMeanBufferLength);
+
+    // Initialize the history with a uniformly distributed histogram
+    _quantHistUW8[0][0] = 0;
+    _quantHistUW8[0][kNumQuants - 1] = 255;
+    for (WebRtc_Word32 i = 0; i < kNumProbs; i++)
+    {
+        _quantHistUW8[0][i + 1] = static_cast<WebRtc_UWord8>((WEBRTC_SPL_UMUL_16_16(
+            _probUW16[i], 255) + (1 << 10)) >> 11); // Unsigned round. <Q0>
+    }
+    
+    for (WebRtc_Word32 i = 1; i < kFrameHistorySize; i++)
+    {
+        memcpy(_quantHistUW8[i], _quantHistUW8[0], sizeof(WebRtc_UWord8) * kNumQuants);
+    }
+}
+
+WebRtc_Word32
+VPMDeflickering::ProcessFrame(WebRtc_UWord8* frame,
+                              const WebRtc_UWord32 width,
+                              const WebRtc_UWord32 height,
+                              const WebRtc_UWord32 timestamp,
+                              VideoProcessingModule::FrameStats& stats)
+{
+    WebRtc_UWord32 frameMemory;
+    WebRtc_UWord8 quantUW8[kNumQuants];
+    WebRtc_UWord8 maxQuantUW8[kNumQuants];
+    WebRtc_UWord8 minQuantUW8[kNumQuants];
+    WebRtc_UWord16 targetQuantUW16[kNumQuants];
+    WebRtc_UWord16 incrementUW16;
+    WebRtc_UWord8 mapUW8[256];
+
+    WebRtc_UWord16 tmpUW16;
+    WebRtc_UWord32 tmpUW32;
+
+    if (frame == NULL)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Null frame pointer");
+        return VPM_GENERAL_ERROR;
+    }
+
+    // Stricter height check due to subsampling size calculation below.
+    if (width == 0 || height < 2)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Invalid frame size");
+        return VPM_GENERAL_ERROR;
+    }
+
+    if (!VideoProcessingModule::ValidFrameStats(stats))
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Invalid frame stats");
+        return VPM_GENERAL_ERROR;
+    }
+
+    if (PreDetection(timestamp, stats) == -1)
+    {
+        return VPM_GENERAL_ERROR;
+    }
+
+    // Flicker detection
+    WebRtc_Word32 detFlicker = DetectFlicker();
+    if (detFlicker < 0)
+    { // Error
+        return VPM_GENERAL_ERROR;
+    }
+    else if (detFlicker != 1)
+    {
+        return 0;
+    }
+
+    // Size of luminance component
+    const WebRtc_UWord32 ySize = height * width;
+
+    const WebRtc_UWord32 ySubSize = width * (((height - 1) >>
+        kLog2OfDownsamplingFactor) + 1);
+    WebRtc_UWord8* ySorted = new WebRtc_UWord8[ySubSize];
+    WebRtc_UWord32 sortRowIdx = 0;
+    for (WebRtc_UWord32 i = 0; i < height; i += kDownsamplingFactor)
+    {
+        memcpy(ySorted + sortRowIdx * width, frame + i * width, width);
+        sortRowIdx++;
+    }
+    
+    webrtc::Sort(ySorted, ySubSize, webrtc::TYPE_UWord8);
+
+    WebRtc_UWord32 probIdxUW32 = 0;
+    quantUW8[0] = 0;
+    quantUW8[kNumQuants - 1] = 255;
+
+    // Ensure we won't get an overflow below.
+    // In practice, the number of subsampled pixels will not become this large.
+    if (ySubSize > (1 << 21) - 1)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, 
+            "Subsampled number of pixels too large");
+        return -1;
+    }
+
+    for (WebRtc_Word32 i = 0; i < kNumProbs; i++)
+    {
+        probIdxUW32 = WEBRTC_SPL_UMUL_32_16(ySubSize, _probUW16[i]) >> 11; // <Q0>
+        quantUW8[i + 1] = ySorted[probIdxUW32];
+    }
+
+    delete [] ySorted;
+    ySorted = NULL;
+
+    // Shift history for new frame.
+    memmove(_quantHistUW8[1], _quantHistUW8[0], (kFrameHistorySize - 1) * kNumQuants *
+        sizeof(WebRtc_UWord8));
+    // Store current frame in history.
+    memcpy(_quantHistUW8[0], quantUW8, kNumQuants * sizeof(WebRtc_UWord8));
+
+    // We use a frame memory equal to the ceiling of half the frame rate to ensure we
+    // capture an entire period of flicker.
+    frameMemory = (_frameRate + (1 << 5)) >> 5; // Unsigned ceiling. <Q0>
+                                                // _frameRate in Q4.
+    if (frameMemory > kFrameHistorySize)
+    {
+        frameMemory = kFrameHistorySize;
+    }
+
+    // Get maximum and minimum.
+    for (WebRtc_Word32 i = 0; i < kNumQuants; i++)
+    {
+        maxQuantUW8[i] = 0;
+        minQuantUW8[i] = 255;
+        for (WebRtc_UWord32 j = 0; j < frameMemory; j++)
+        {
+            if (_quantHistUW8[j][i] > maxQuantUW8[i])
+            {
+                maxQuantUW8[i] = _quantHistUW8[j][i];
+            }
+
+            if (_quantHistUW8[j][i] < minQuantUW8[i])
+            {
+                minQuantUW8[i] = _quantHistUW8[j][i];
+            }
+        }
+    }
+    
+    // Get target quantiles.
+    for (WebRtc_Word32 i = 0; i < kNumQuants - kMaxOnlyLength; i++)
+    {
+        targetQuantUW16[i] = static_cast<WebRtc_UWord16>((WEBRTC_SPL_UMUL_16_16(
+            _weightUW16[i], maxQuantUW8[i]) + WEBRTC_SPL_UMUL_16_16((1 << 15) -
+            _weightUW16[i], minQuantUW8[i])) >> 8); // <Q7>
+    }
+
+    for (WebRtc_Word32 i = kNumQuants - kMaxOnlyLength; i < kNumQuants; i++)
+    {
+        targetQuantUW16[i] = ((WebRtc_UWord16)maxQuantUW8[i]) << 7;
+    }
+
+    // Compute the map from input to output pixels.
+    WebRtc_UWord16 mapUW16; // <Q7>
+    for (WebRtc_Word32 i = 1; i < kNumQuants; i++)
+    {
+        // As quant and targetQuant are limited to UWord8, we're safe to use Q7 here.
+        tmpUW32 = static_cast<WebRtc_UWord32>(targetQuantUW16[i] -
+            targetQuantUW16[i - 1]); // <Q7>
+        tmpUW16 = static_cast<WebRtc_UWord16>(quantUW8[i] - quantUW8[i - 1]); // <Q0>
+
+        if (tmpUW16 > 0)
+        {
+            incrementUW16 = static_cast<WebRtc_UWord16>(WebRtcSpl_DivU32U16(tmpUW32,
+                tmpUW16)); // <Q7>
+         }
+        else
+        {
+            // The value is irrelevant; the loop below will only iterate once.
+            incrementUW16 = 0;
+        }
+
+        mapUW16 = targetQuantUW16[i - 1];
+        for (WebRtc_UWord32 j = quantUW8[i - 1]; j < (WebRtc_UWord32)(quantUW8[i] + 1); j++)
+        {
+            mapUW8[j] = (WebRtc_UWord8)((mapUW16 + (1 << 6)) >> 7); // Unsigned round. <Q0>
+            mapUW16 += incrementUW16;
+        }
+    }
+
+    // Map to the output frame.
+    for (WebRtc_UWord32 i = 0; i < ySize; i++)
+    {
+        frame[i] = mapUW8[frame[i]];
+    }
+
+    // Frame was altered, so reset stats.
+    VideoProcessingModule::ClearFrameStats(stats);
+
+    return 0;
+}
+
+/**
+   Performs some pre-detection operations. Must be called before 
+   DetectFlicker().
+
+   \param[in] timestamp Timestamp of the current frame.
+   \param[in] stats     Statistics of the current frame.
+ 
+   \return 0: Success\n
+           2: Detection not possible due to flickering frequency too close to
+              zero.\n
+          -1: Error
+*/
+WebRtc_Word32
+VPMDeflickering::PreDetection(const WebRtc_UWord32 timestamp,
+                              const VideoProcessingModule::FrameStats& stats)
+{
+    WebRtc_Word32 meanVal; // Mean value of frame (Q4)
+    WebRtc_UWord32 frameRate = 0;
+    WebRtc_Word32 meanBufferLength; // Temp variable
+
+    meanVal = ((stats.sum << kMeanValueScaling) / stats.numPixels);
+    /* Update mean value buffer.
+     * This should be done even though we might end up in an unreliable detection.
+     */
+    memmove(_meanBuffer + 1, _meanBuffer, (kMeanBufferLength - 1) * sizeof(WebRtc_Word32));
+    _meanBuffer[0] = meanVal;
+
+    /* Update timestamp buffer.
+     * This should be done even though we might end up in an unreliable detection.
+     */
+    memmove(_timestampBuffer + 1, _timestampBuffer, (kMeanBufferLength - 1) *
+        sizeof(WebRtc_UWord32));
+    _timestampBuffer[0] = timestamp;
+
+    /* Compute current frame rate (Q4) */
+    if (_timestampBuffer[kMeanBufferLength - 1] != 0)
+    {
+        frameRate = ((90000 << 4) * (kMeanBufferLength - 1));
+        frameRate /= (_timestampBuffer[0] - _timestampBuffer[kMeanBufferLength - 1]);
+    }else if (_timestampBuffer[1] != 0)
+    {
+        frameRate = (90000 << 4) / (_timestampBuffer[0] - _timestampBuffer[1]);
+    }
+
+    /* Determine required size of mean value buffer (_meanBufferLength) */
+    if (frameRate == 0) {
+        meanBufferLength = 1;
+    }
+    else {
+        meanBufferLength = (kNumFlickerBeforeDetect * frameRate) / kMinFrequencyToDetect;
+    }
+    /* Sanity check of buffer length */
+    if (meanBufferLength >= kMeanBufferLength)
+    {
+        /* Too long buffer. The flickering frequency is too close to zero, which
+         * makes the estimation unreliable.
+         */
+        _meanBufferLength = 0;
+        return 2;
+    }
+    _meanBufferLength = meanBufferLength;
+
+    if ((_timestampBuffer[_meanBufferLength - 1] != 0) && (_meanBufferLength != 1))
+    {
+        frameRate = ((90000 << 4) * (_meanBufferLength - 1));
+        frameRate /= (_timestampBuffer[0] - _timestampBuffer[_meanBufferLength - 1]);
+    }else if (_timestampBuffer[1] != 0)
+    {
+        frameRate = (90000 << 4) / (_timestampBuffer[0] - _timestampBuffer[1]);
+    }
+    _frameRate = frameRate;
+
+    return 0;
+}
+
+/**
+   This function detects flicker in the video stream. As a side effect the mean value
+   buffer is updated with the new mean value.
+ 
+   \return 0: No flickering detected\n
+           1: Flickering detected\n
+           2: Detection not possible due to unreliable frequency interval
+          -1: Error
+*/
+WebRtc_Word32 VPMDeflickering::DetectFlicker()
+{
+    /* Local variables */
+    WebRtc_UWord32  i;
+    WebRtc_Word32  freqEst;       // (Q4) Frequency estimate to base detection upon
+    WebRtc_Word32  retVal = -1;
+
+    /* Sanity check for _meanBufferLength */
+    if (_meanBufferLength < 2)
+    {
+        /* Not possible to estimate frequency */
+        return(2);
+    }
+    /* Count zero crossings with a dead zone to be robust against noise.
+     * If the noise std is 2 pixel this corresponds to about 95% confidence interval.
+     */
+    WebRtc_Word32 deadzone = (kZeroCrossingDeadzone << kMeanValueScaling); // Q4
+    WebRtc_Word32 meanOfBuffer = 0; // Mean value of mean value buffer
+    WebRtc_Word32 numZeros     = 0; // Number of zeros that cross the deadzone
+    WebRtc_Word32 cntState     = 0; // State variable for zero crossing regions
+    WebRtc_Word32 cntStateOld  = 0; // Previous state variable for zero crossing regions
+
+    for (i = 0; i < _meanBufferLength; i++)
+    {
+        meanOfBuffer += _meanBuffer[i];
+    }
+    meanOfBuffer += (_meanBufferLength >> 1); // Rounding, not truncation
+    meanOfBuffer /= _meanBufferLength;
+
+    /* Count zero crossings */
+    cntStateOld = (_meanBuffer[0] >= (meanOfBuffer + deadzone));
+    cntStateOld -= (_meanBuffer[0] <= (meanOfBuffer - deadzone));
+    for (i = 1; i < _meanBufferLength; i++)
+    {
+        cntState = (_meanBuffer[i] >= (meanOfBuffer + deadzone));
+        cntState -= (_meanBuffer[i] <= (meanOfBuffer - deadzone));
+        if (cntStateOld == 0)
+        {
+            cntStateOld = -cntState;
+        }
+        if (((cntState + cntStateOld) == 0) && (cntState != 0))
+        {
+            numZeros++;
+            cntStateOld = cntState;
+        }
+    }
+    /* END count zero crossings */
+
+    /* Frequency estimation according to:
+     * freqEst = numZeros * frameRate / 2 / _meanBufferLength;
+     *
+     * Resolution is set to Q4
+     */
+    freqEst = ((numZeros * 90000) << 3);
+    freqEst /= (_timestampBuffer[0] - _timestampBuffer[_meanBufferLength - 1]);
+
+    /* Translate frequency estimate to regions close to 100 and 120 Hz */
+    WebRtc_UWord8 freqState = 0; // Current translation state;
+                               // (0) Not in interval,
+                               // (1) Within valid interval,
+                               // (2) Out of range
+    WebRtc_Word32 freqAlias = freqEst;
+    if (freqEst > kMinFrequencyToDetect)
+    {
+        WebRtc_UWord8 aliasState = 1;
+        while(freqState == 0)
+        {
+            /* Increase frequency */
+            freqAlias += (aliasState * _frameRate);
+            freqAlias += ((freqEst << 1) * (1 - (aliasState << 1)));
+            /* Compute state */
+            freqState = (abs(freqAlias - (100 << 4)) <= kFrequencyDeviation);
+            freqState += (abs(freqAlias - (120 << 4)) <= kFrequencyDeviation);
+            freqState += 2 * (freqAlias > ((120 << 4) + kFrequencyDeviation));
+            /* Switch alias state */
+            aliasState++;
+            aliasState &= 0x01;
+        }
+    }
+    /* Is frequency estimate within detection region? */
+    if (freqState == 1)
+    {
+        retVal = 1;
+    }else if (freqState == 0)
+    {
+        retVal = 2;
+    }else
+    {
+        retVal = 0;
+    }
+    return retVal;
+}
+
+} //namespace

modules/video_processing/main/source/deflickering.h

@@ -0,0 +1,69 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * deflickering.h
+ */
+
+#ifndef VPM_DEFLICKERING_H
+#define VPM_DEFLICKERING_H
+
+#include "typedefs.h"
+#include "video_processing.h"
+
+#include <cstring>  // NULL
+
+namespace webrtc {
+
+class VPMDeflickering
+{
+public:
+    VPMDeflickering();
+    ~VPMDeflickering();
+
+    WebRtc_Word32 ChangeUniqueId(WebRtc_Word32 id);
+
+    void Reset();
+
+    WebRtc_Word32 ProcessFrame(WebRtc_UWord8* frame,
+                             WebRtc_UWord32 width,
+                             WebRtc_UWord32 height,
+                             WebRtc_UWord32 timestamp,
+                             VideoProcessingModule::FrameStats& stats);
+private:
+    WebRtc_Word32 PreDetection(WebRtc_UWord32 timestamp,
+                             const VideoProcessingModule::FrameStats& stats);
+
+    WebRtc_Word32 DetectFlicker();
+
+    enum { kMeanBufferLength = 32 };
+    enum { kFrameHistorySize = 15 };
+    enum { kNumProbs = 12 };
+    enum { kNumQuants = kNumProbs + 2 };
+    enum { kMaxOnlyLength = 5 };
+
+    WebRtc_Word32 _id;
+
+    WebRtc_UWord32  _meanBufferLength;
+    WebRtc_UWord8   _detectionState;    // 0: No flickering
+                                      // 1: Flickering detected
+                                      // 2: In flickering
+    WebRtc_Word32    _meanBuffer[kMeanBufferLength];
+    WebRtc_UWord32   _timestampBuffer[kMeanBufferLength];
+    WebRtc_UWord32   _frameRate;
+    static const WebRtc_UWord16 _probUW16[kNumProbs];
+    static const WebRtc_UWord16 _weightUW16[kNumQuants - kMaxOnlyLength];
+    WebRtc_UWord8 _quantHistUW8[kFrameHistorySize][kNumQuants];
+};
+
+} //namespace
+
+#endif // VPM_DEFLICKERING_H
+

modules/video_processing/main/source/denoising.cc

@@ -0,0 +1,180 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "denoising.h"
+#include "trace.h"
+
+#include <cstring>
+
+namespace webrtc {
+
+enum { kSubsamplingTime = 0 };       // Down-sampling in time (unit: number of frames)
+enum { kSubsamplingWidth = 3 };      // Sub-sampling in width (unit: power of 2)
+enum { kSubsamplingHeight = 2 };     // Sub-sampling in height (unit: power of 2)
+enum { kDenoiseFiltParam = 179 };    // (Q8) De-noising filter parameter
+enum { kDenoiseFiltParamRec = 77 };  // (Q8) 1 - filter parameter
+enum { kDenoiseThreshold = 19200 };  // (Q8) De-noising threshold level
+
+VPMDenoising::VPMDenoising() :
+    _id(0),
+    _moment1(NULL),
+    _moment2(NULL)
+{
+    Reset();
+}
+
+VPMDenoising::~VPMDenoising()
+{
+    if (_moment1)
+    {
+        delete [] _moment1;
+        _moment1 = NULL;
+    }
+    
+    if (_moment2)
+    {
+        delete [] _moment2;
+        _moment2 = NULL;
+    }
+}
+
+WebRtc_Word32
+VPMDenoising::ChangeUniqueId(const WebRtc_Word32 id)
+{
+    _id = id;
+    return VPM_OK;
+}
+
+void
+VPMDenoising::Reset()
+{
+    _frameSize = 0;
+    _denoiseFrameCnt = 0;
+
+    if (_moment1)
+    {
+        delete [] _moment1;
+        _moment1 = NULL;
+    }
+    
+    if (_moment2)
+    {
+        delete [] _moment2;
+        _moment2 = NULL;
+    }
+}
+
+WebRtc_Word32
+VPMDenoising::ProcessFrame(WebRtc_UWord8* frame,
+                           const WebRtc_UWord32 width,
+                           const WebRtc_UWord32 height)
+{
+    WebRtc_Word32     thevar;
+    WebRtc_UWord32    k;
+    WebRtc_UWord32    jsub, ksub;
+    WebRtc_Word32     diff0;
+    WebRtc_UWord32    tmpMoment1;
+    WebRtc_UWord32    tmpMoment2;
+    WebRtc_UWord32    tmp;
+    WebRtc_Word32     numPixelsChanged = 0;
+
+    if (frame == NULL)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Null frame pointer");
+        return VPM_GENERAL_ERROR;
+    }
+
+    if (width == 0 || height == 0)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, _id, "Invalid frame size");
+        return VPM_GENERAL_ERROR;
+    }
+
+    /* Size of luminance component */
+    const WebRtc_UWord32 ysize  = height * width;
+
+    /* Initialization */
+    if (ysize != _frameSize)
+    {
+        delete [] _moment1;
+        _moment1 = NULL;
+
+        delete [] _moment2;
+        _moment2 = NULL;
+    }
+    _frameSize = ysize;
+
+    if (!_moment1)
+    {
+        _moment1 = new WebRtc_UWord32[ysize];
+        memset(_moment1, 0, sizeof(WebRtc_UWord32)*ysize);
+    }
+    
+    if (!_moment2)
+    {
+        _moment2 = new WebRtc_UWord32[ysize];
+        memset(_moment2, 0, sizeof(WebRtc_UWord32)*ysize);
+    }
+
+    /* Apply de-noising on each pixel, but update variance sub-sampled */
+    for (WebRtc_UWord32 i = 0; i < height; i++)
+    { // Collect over height
+        k = i * width;
+        ksub = ((i >> kSubsamplingHeight) << kSubsamplingHeight) * width;
+        for (WebRtc_UWord32 j = 0; j < width; j++)
+        { // Collect over width
+            jsub = ((j >> kSubsamplingWidth) << kSubsamplingWidth);
+            /* Update mean value for every pixel and every frame */
+            tmpMoment1 = _moment1[k + j];
+            tmpMoment1 *= kDenoiseFiltParam; // Q16
+            tmpMoment1 += ((kDenoiseFiltParamRec * ((WebRtc_UWord32)frame[k + j])) << 8);
+            tmpMoment1 >>= 8; // Q8
+            _moment1[k + j] = tmpMoment1;
+
+            tmpMoment2 = _moment2[ksub + jsub];
+            if ((ksub == k) && (jsub == j) && (_denoiseFrameCnt == 0))
+            {
+                tmp = ((WebRtc_UWord32)frame[k + j] * (WebRtc_UWord32)frame[k + j]);
+                tmpMoment2 *= kDenoiseFiltParam; // Q16
+                tmpMoment2 += ((kDenoiseFiltParamRec * tmp)<<8);
+                tmpMoment2 >>= 8; // Q8
+            }
+            _moment2[k + j] = tmpMoment2;
+            /* Current event = deviation from mean value */
+            diff0 = ((WebRtc_Word32)frame[k + j] << 8) - _moment1[k + j];
+            /* Recent events = variance (variations over time) */
+            thevar = _moment2[k + j];
+            thevar -= ((_moment1[k + j] * _moment1[k + j]) >> 8);
+            /***************************************************************************
+             * De-noising criteria, i.e., when should we replace a pixel by its mean
+             *
+             * 1) recent events are minor
+             * 2) current events are minor
+             ***************************************************************************/
+            if ((thevar < kDenoiseThreshold)
+                && ((diff0 * diff0 >> 8) < kDenoiseThreshold))
+            { // Replace with mean
+                frame[k + j] = (WebRtc_UWord8)(_moment1[k + j] >> 8);
+                numPixelsChanged++;
+            }
+        }
+    }
+
+    /* Update frame counter */
+    _denoiseFrameCnt++;
+    if (_denoiseFrameCnt > kSubsamplingTime)
+    {
+        _denoiseFrameCnt = 0;
+    }
+
+    return numPixelsChanged;
+}
+
+} //namespace

modules/video_processing/main/source/denoising.h

@@ -0,0 +1,48 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * denoising.h
+ */
+#ifndef VPM_DENOISING_H
+#define VPM_DENOISING_H
+
+#include "typedefs.h"
+#include "video_processing.h"
+
+namespace webrtc {
+
+class VPMDenoising
+{
+public:
+    VPMDenoising();
+    ~VPMDenoising();
+
+    WebRtc_Word32 ChangeUniqueId(WebRtc_Word32 id);
+
+    void Reset();
+
+    WebRtc_Word32 ProcessFrame(WebRtc_UWord8* frame,
+                             WebRtc_UWord32 width,
+                             WebRtc_UWord32 height);
+
+private:
+    WebRtc_Word32 _id;
+
+    WebRtc_UWord32*   _moment1;           // (Q8) First order moment (mean)
+    WebRtc_UWord32*   _moment2;           // (Q8) Second order moment
+    WebRtc_UWord32    _frameSize;         // Size (# of pixels) of frame
+    WebRtc_Word32     _denoiseFrameCnt;   // Counter for subsampling in time
+};
+
+} //namespace
+
+#endif // VPM_DENOISING_H
+  

modules/video_processing/main/source/frame_preprocessor.cc

@@ -0,0 +1,188 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "frame_preprocessor.h"
+#include "trace.h"
+
+namespace webrtc {
+
+VPMFramePreprocessor::VPMFramePreprocessor():
+_id(0),
+_contentMetrics(NULL),
+_nativeHeight(0),
+_nativeWidth(0),
+_resampledFrame(),
+_enableCA(false)
+{
+    _spatialResampler = new VPMSimpleSpatialResampler();
+    _ca = new VPMContentAnalysis();
+    _vd = new VPMVideoDecimator();
+}
+
+VPMFramePreprocessor::~VPMFramePreprocessor()
+{
+    Reset();
+    delete _spatialResampler;
+    delete _ca;
+    delete _vd;
+    _resampledFrame.Free(); // is this needed?
+}
+
+WebRtc_Word32
+VPMFramePreprocessor::ChangeUniqueId(const WebRtc_Word32 id)
+{
+    _id = id;
+    return VPM_OK;
+}
+
+void 
+VPMFramePreprocessor::Reset()
+{
+    _nativeWidth = 0;
+    _nativeHeight = 0;
+    _ca->Release();
+    _vd->Reset();
+    _contentMetrics = NULL;
+    _spatialResampler->Reset();
+    _enableCA = false;
+}
+	
+    
+void 
+VPMFramePreprocessor::EnableTemporalDecimation(bool enable)
+{
+    _vd->EnableTemporalDecimation(enable);
+}
+void
+VPMFramePreprocessor::EnableContentAnalysis(bool enable)
+{
+    _enableCA = enable;
+}
+
+void 
+VPMFramePreprocessor::SetInputFrameResampleMode(VideoFrameResampling resamplingMode)
+{
+    _spatialResampler->SetInputFrameResampleMode(resamplingMode);
+}
+
+    
+WebRtc_Word32
+VPMFramePreprocessor::SetMaxFrameRate(WebRtc_UWord32 maxFrameRate)
+{
+    if (maxFrameRate == 0)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+    //Max allowed frame rate
+    _maxFrameRate = maxFrameRate;
+
+    return _vd->SetMaxFrameRate(maxFrameRate);
+}
+    
+
+WebRtc_Word32
+VPMFramePreprocessor::SetTargetResolution(WebRtc_UWord32 width, WebRtc_UWord32 height, WebRtc_UWord32 frameRate)
+{
+    if ( (width == 0) || (height == 0) || (frameRate == 0))
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+    WebRtc_Word32 retVal = 0;
+    retVal = _spatialResampler->SetTargetFrameSize(width, height);
+    if (retVal < 0)
+    {
+        return retVal;
+    }
+    retVal = _vd->SetTargetFrameRate(frameRate);
+    if (retVal < 0)
+    {
+        return retVal;
+    }
+
+	  return VPM_OK;
+}
+
+void 
+VPMFramePreprocessor::UpdateIncomingFrameRate()
+{
+    _vd->UpdateIncomingFrameRate();
+}
+
+WebRtc_UWord32
+VPMFramePreprocessor::DecimatedFrameRate()
+{
+    return _vd->DecimatedFrameRate();
+}
+
+
+WebRtc_UWord32
+VPMFramePreprocessor::DecimatedWidth() const
+{
+    return _spatialResampler->TargetWidth();
+}
+
+
+WebRtc_UWord32
+VPMFramePreprocessor::DecimatedHeight() const
+{
+    return _spatialResampler->TargetHeight();
+}
+
+
+WebRtc_Word32
+VPMFramePreprocessor::PreprocessFrame(const VideoFrame* frame, VideoFrame** processedFrame)
+{
+    if (frame == NULL)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+    else if (frame->Height() == 0 || frame->Width() == 0)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+    _vd->UpdateIncomingFrameRate();
+
+    if (_vd->DropFrame())
+    {
+        WEBRTC_TRACE(webrtc::kTraceStream, webrtc::kTraceVideo, _id, "Drop frame due to frame rate");
+        return 1;// drop 1 frame
+    }
+
+    //Resizing incoming frame.
+    // Note that we must make a copy of it. We are not allowed to resample the input frame.
+    WebRtc_Word32 ret = _spatialResampler->ResampleFrame(*frame, _resampledFrame);
+    if (ret != VPM_OK)
+    {
+        return ret;
+    }
+
+    *processedFrame = &_resampledFrame;
+
+    // Perform content analysis on the resampled frame
+    if (_enableCA)
+    {
+        _contentMetrics = _ca->ComputeContentMetrics(&_resampledFrame);
+        //Update native values:
+        _contentMetrics->nativeHeight = frame->Height();
+        _contentMetrics->nativeWidth = frame->Width();
+
+        _contentMetrics->nativeFrameRate = _maxFrameRate; // max value as set by user 
+    }
+    return VPM_OK;
+}
+
+
+VideoContentMetrics*
+VPMFramePreprocessor::ContentMetrics() const
+{
+    return _contentMetrics;
+}
+
+} //namespace

modules/video_processing/main/source/frame_preprocessor.h

@@ -0,0 +1,82 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * frame_preprocessor.h
+ */
+#ifndef VPM_FRAME_PREPROCESSOR_H
+#define VPM_FRAME_PREPROCESSOR_H
+
+#include "typedefs.h"
+#include "video_processing.h"
+#include "content_analysis.h"
+#include "spatial_resampler.h"
+#include "video_decimator.h"
+
+namespace webrtc {
+
+
+class VPMFramePreprocessor
+{
+public:
+
+    VPMFramePreprocessor();
+    ~VPMFramePreprocessor();
+
+    WebRtc_Word32 ChangeUniqueId(const WebRtc_Word32 id);
+
+    void Reset();
+
+    // Enable temporal decimation
+    void EnableTemporalDecimation(bool enable);
+
+    void SetInputFrameResampleMode(VideoFrameResampling resamplingMode);
+
+    //Enable content analysis
+    void EnableContentAnalysis(bool enable);
+
+    //Set max frame rate
+    WebRtc_Word32 SetMaxFrameRate(WebRtc_UWord32 maxFrameRate);
+
+    //Set target resolution: frame rate and dimension
+    WebRtc_Word32 SetTargetResolution(WebRtc_UWord32 width, WebRtc_UWord32 height, WebRtc_UWord32 frameRate);
+
+    //Update incoming frame rate/dimension
+    void UpdateIncomingFrameRate();
+
+    WebRtc_Word32 updateIncomingFrameSize(WebRtc_UWord32 width, WebRtc_UWord32 height);
+
+    //Set decimated values: frame rate/dimension
+    WebRtc_UWord32 DecimatedFrameRate();
+    WebRtc_UWord32 DecimatedWidth() const;
+    WebRtc_UWord32 DecimatedHeight() const;
+
+    //Preprocess output:
+    WebRtc_Word32 PreprocessFrame(const VideoFrame* frame, VideoFrame** processedFrame);
+    VideoContentMetrics* ContentMetrics() const;
+
+private:
+
+    WebRtc_Word32              _id;
+    VideoContentMetrics*      _contentMetrics;
+    WebRtc_UWord32             _nativeHeight;
+    WebRtc_UWord32             _nativeWidth;
+    WebRtc_UWord32             _maxFrameRate;
+    VideoFrame           _resampledFrame;
+    VPMSpatialResampler*     _spatialResampler;
+    VPMContentAnalysis*      _ca;
+    VPMVideoDecimator*       _vd;
+    bool                     _enableCA;
+    
+}; // end of VPMFramePreprocessor class definition
+
+} //namespace
+
+#endif // VPM_FRAME_PREPROCESS_H

modules/video_processing/main/source/spatial_resampler.cc

@@ -0,0 +1,355 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "spatial_resampler.h"
+
+
+namespace webrtc {
+
+VPMSimpleSpatialResampler::VPMSimpleSpatialResampler()
+:
+_resamplingMode(kFastRescaling),
+_targetWidth(0),
+_targetHeight(0),
+_interpolatorPtr(NULL)
+{
+}
+
+VPMSimpleSpatialResampler::~VPMSimpleSpatialResampler()
+{
+    Release();
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::Release()
+{
+    if (_interpolatorPtr != NULL)
+    {
+        delete _interpolatorPtr;
+        _interpolatorPtr = NULL;
+    }
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::SetTargetFrameSize(WebRtc_UWord32 width,
+                                              WebRtc_UWord32 height)
+{
+    if (_resamplingMode == kNoRescaling)
+    {
+        return VPM_OK;
+    }
+
+    if (width < 1 || height < 1)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+
+    _targetWidth = width;
+    _targetHeight = height;
+
+    return VPM_OK;
+}
+
+void
+VPMSimpleSpatialResampler::SetInputFrameResampleMode(VideoFrameResampling
+                                                     resamplingMode)
+{
+    _resamplingMode = resamplingMode;
+}
+
+void
+VPMSimpleSpatialResampler::Reset()
+{
+    _resamplingMode = kFastRescaling;
+    _targetWidth = 0;
+    _targetHeight = 0;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::ResampleFrame(const VideoFrame& inFrame,
+                                         VideoFrame& outFrame)
+{
+    WebRtc_Word32 ret;
+
+    if (_resamplingMode == kNoRescaling)
+    {
+        return outFrame.CopyFrame(inFrame);
+    }
+    else if (_targetWidth < 1 || _targetHeight < 1)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+
+    // Check if re-sampling is needed
+    if ((inFrame.Width() == _targetWidth) && (inFrame.Height() == _targetHeight))
+    {
+        return outFrame.CopyFrame(inFrame);
+    }
+    if (_resamplingMode == kBiLinear)
+    {
+        return BiLinearInterpolation(inFrame, outFrame);
+    }
+
+    outFrame.SetTimeStamp(inFrame.TimeStamp());
+
+    WebRtc_UWord32 currentLength = inFrame.Width() * inFrame.Height() * 3 / 2;
+    if (_targetWidth > inFrame.Width() && ( ExactMultiplier(inFrame.Width(),
+                                                            inFrame.Height())))
+    {
+        // The codec might want to pad this later... adding 8 pixels
+        const WebRtc_UWord32 requiredSize = (_targetWidth + 8) *
+                                            (_targetHeight + 8) * 3 / 2;
+        outFrame.VerifyAndAllocate(requiredSize);
+        return UpsampleFrame(inFrame, outFrame);
+    }
+    else
+    {
+        // 1 cut/pad
+        // 2 scale factor 2X (in both cases if required)
+        WebRtc_UWord32 croppedWidth = inFrame.Width();
+        WebRtc_UWord32 croppedHeight = inFrame.Height();
+
+        //Calculates cropped dimensions
+        CropSize(inFrame.Width(), inFrame.Height(), croppedWidth, croppedHeight);
+
+        VideoFrame* targetFrame;
+        outFrame.VerifyAndAllocate(croppedWidth * croppedHeight * 3 / 2);
+        targetFrame = &outFrame;
+
+        ConvertI420ToI420(inFrame.Buffer(), inFrame.Width(), inFrame.Height(),
+                          targetFrame->Buffer(), croppedWidth, croppedHeight);
+        targetFrame->SetWidth(croppedWidth);
+        targetFrame->SetHeight(croppedHeight);
+        //We have correct aspect ratio, sub-sample with a multiple of two to get
+        //close to the target size
+        ret = SubsampleMultipleOf2(*targetFrame);
+
+        if (ret != VPM_OK)
+        {
+            return ret;
+        }
+    }
+
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::UpsampleFrame(const VideoFrame& inFrame,
+                                         VideoFrame& outFrame)
+{
+    outFrame.CopyFrame(inFrame);
+    WebRtc_UWord32 currentLength = inFrame.Width() * inFrame.Height() * 3 / 2;
+
+    float ratioWidth = _targetWidth / (float)inFrame.Width();
+    float ratioHeight = _targetHeight / (float)inFrame.Height();
+
+    WebRtc_UWord32 scaledWidth = 0;
+    WebRtc_UWord32 scaledHeight = 0;
+    bool scaled = true;
+
+    if(ratioWidth > 1 || ratioHeight > 1)
+    {
+        // scale up
+        if(ratioWidth <= 1.5 && ratioHeight <= 1.5)
+        {
+            // scale up 1.5
+            currentLength = ScaleI420Up3_2(inFrame.Width(), inFrame.Height(),
+                                           outFrame.Buffer(), outFrame.Size(),
+                                           scaledWidth, scaledHeight);
+        }
+        else if(ratioWidth <= 2 && ratioHeight <= 2)
+        {
+            // scale up 2
+            currentLength = ScaleI420Up2(inFrame.Width(), inFrame.Height(),
+                                         outFrame.Buffer(), outFrame.Size(),
+                                         scaledWidth, scaledHeight);
+        }
+        else if(ratioWidth <= 2.25 && ratioHeight <= 2.25)
+        {
+            // scale up 2.25
+            currentLength = ScaleI420Up3_2(inFrame.Width(), inFrame.Height(),
+                                           outFrame.Buffer(), outFrame.Size(),
+                                           scaledWidth, scaledHeight);
+            currentLength = ScaleI420Up3_2(scaledWidth, scaledHeight,
+                                           outFrame.Buffer(), outFrame.Size(),
+                                           scaledWidth, scaledHeight);
+        }
+        else if(ratioWidth <= 3 && ratioHeight <= 3)
+        {
+            // scale up 3
+            currentLength = ScaleI420Up2(inFrame.Width(), inFrame.Height(),
+                                         outFrame.Buffer(), outFrame.Size(),
+                                         scaledWidth, scaledHeight);
+            currentLength = ScaleI420Up3_2(scaledWidth, scaledHeight,
+                                           outFrame.Buffer(), outFrame.Size(),
+                                           scaledWidth, scaledHeight);
+        }
+        else if(ratioWidth <= 4 && ratioHeight <= 4)
+        {
+            // scale up 4
+            currentLength = ScaleI420Up2(inFrame.Width(), inFrame.Height(),
+                                         outFrame.Buffer(), outFrame.Size(),
+                                         scaledWidth, scaledHeight);
+            currentLength = ScaleI420Up2(scaledWidth, scaledHeight,
+                                         outFrame.Buffer(), outFrame.Size(),
+                                         scaledWidth, scaledHeight);
+        }
+
+        //TODO: what if ratioWidth/Height >= 8 ?
+
+        if (scaledWidth <= 0 || scaledHeight <= 0)
+        {
+            return VPM_GENERAL_ERROR;
+        }
+
+        if ((static_cast<WebRtc_UWord32>(scaledWidth) > _targetWidth) ||
+            (static_cast<WebRtc_UWord32>(scaledHeight) > _targetHeight))
+        {
+            currentLength = CutI420Frame(outFrame.Buffer(), scaledWidth,
+                                         scaledHeight, _targetWidth,
+                                         _targetHeight);
+        }
+    }
+    else
+    {
+        return VPM_GENERAL_ERROR;
+    }
+
+    outFrame.SetWidth(_targetWidth);
+    outFrame.SetHeight(_targetHeight);
+    outFrame.SetLength(_targetWidth * _targetHeight * 3 / 2);
+
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::CropSize(WebRtc_UWord32 width, WebRtc_UWord32 height,
+                                    WebRtc_UWord32& croppedWidth,
+                                    WebRtc_UWord32& croppedHeight) const
+{
+    // Crop the image to a width and height  which is a
+    // multiple of two, so that we can do a simpler scaling.
+    croppedWidth = _targetWidth;
+    croppedHeight = _targetHeight;
+
+    if (width >= 8 * _targetWidth && height >= 8 * _targetHeight)
+    {
+        croppedWidth = 8 * _targetWidth;
+        croppedHeight = 8 * _targetHeight;
+    }
+    else if (width >= 4 * _targetWidth && height >= 4 * _targetHeight)
+    {
+        croppedWidth = 4 * _targetWidth;
+        croppedHeight = 4 * _targetHeight;
+    }
+    else if (width >= 2 * _targetWidth && height >= 2 * _targetHeight)
+    {
+        croppedWidth = 2 * _targetWidth;
+        croppedHeight = 2 * _targetHeight;
+    }
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::SubsampleMultipleOf2(VideoFrame& frame)
+{
+    WebRtc_UWord32 tempWidth = frame.Width();
+    WebRtc_UWord32 tempHeight = frame.Height();
+
+    while (tempWidth / _targetWidth >= 2 && tempHeight / _targetHeight >= 2)
+    {
+        ScaleI420FrameQuarter(tempWidth, tempHeight, frame.Buffer());
+        tempWidth /= 2;
+        tempHeight /= 2;
+    }
+    frame.SetWidth(tempWidth);
+    frame.SetHeight(tempHeight);
+    frame.SetLength(frame.Width() * frame.Height() * 3 / 2);
+
+    return VPM_OK;
+}
+
+
+bool
+VPMSimpleSpatialResampler::ExactMultiplier(WebRtc_UWord32 width,
+                                           WebRtc_UWord32 height) const
+{
+    bool exactMultiplier = false;
+    if (_targetWidth % width == 0 && _targetHeight % height == 0)
+    {
+        // we have a multiple, is it an even multiple?
+        WebRtc_Word32 widthMultiple = _targetWidth / width;
+        WebRtc_Word32 heightMultiple = _targetHeight / height;
+        if (widthMultiple == 2 && heightMultiple == 2 ||
+            widthMultiple == 4 && heightMultiple == 4 ||
+            widthMultiple == 8 && heightMultiple == 8 ||
+            widthMultiple == 1 && heightMultiple == 1)
+        {
+            exactMultiplier = true;
+        }
+    }
+    return exactMultiplier;
+}
+
+WebRtc_Word32
+VPMSimpleSpatialResampler::BiLinearInterpolation(const VideoFrame& inFrame,
+                                                 VideoFrame& outFrame)
+{
+    WebRtc_Word32 retVal;
+
+   if (_interpolatorPtr == NULL)
+   {
+       _interpolatorPtr = new interpolator();
+       if (_interpolatorPtr == NULL)
+       {
+           return VPM_MEMORY;
+       }
+   }
+   // set bi-linear interpolator
+   retVal =  _interpolatorPtr->Set(inFrame.Width(), inFrame.Height(),
+                                   _targetWidth, _targetHeight,
+                                   kI420, kI420, kBilinear );
+    if (retVal < 0 )
+    {
+        return retVal;
+    }
+
+    //Verify size of output buffer
+    outFrame.VerifyAndAllocate(_targetHeight * _targetWidth * 3 / 2);
+
+    //interpolate frame
+    retVal = _interpolatorPtr->Interpolate(inFrame.Buffer(), outFrame.Buffer());
+    //returns height
+    if (retVal < 0)
+        return retVal;
+
+    //Set output frame parameters
+    outFrame.SetHeight(_targetHeight);
+    outFrame.SetWidth(_targetWidth);
+    outFrame.SetLength(_targetHeight * _targetWidth * 3 / 2);
+    outFrame.SetTimeStamp(inFrame.TimeStamp());
+    return VPM_OK;
+}
+
+WebRtc_UWord32
+VPMSimpleSpatialResampler::TargetHeight()
+{
+    return _targetHeight;
+}
+
+WebRtc_UWord32
+VPMSimpleSpatialResampler::TargetWidth()
+{
+    return _targetWidth;
+}
+
+
+} //namespace

modules/video_processing/main/source/spatial_resampler.h

@@ -0,0 +1,78 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * spatial_resampler.h
+ */
+
+#ifndef VPM_SPATIAL_RESAMPLER_H
+#define VPM_SPATIAL_RESAMPLER_H
+
+#include "typedefs.h"
+
+#include "module_common_types.h"
+#include "video_processing_defines.h"
+
+#include "vplib.h"
+#include "interpolator.h"
+
+namespace webrtc {
+
+class VPMSpatialResampler
+{
+public:
+    virtual ~VPMSpatialResampler() {};
+    virtual WebRtc_Word32 SetTargetFrameSize(WebRtc_UWord32 width,
+                                             WebRtc_UWord32 height) = 0;
+    virtual void SetInputFrameResampleMode(VideoFrameResampling
+                                           resamplingMode) = 0;
+    virtual void Reset() = 0;
+    virtual WebRtc_Word32 ResampleFrame(const VideoFrame& inFrame,
+                                        VideoFrame& outFrame) = 0;
+    virtual WebRtc_UWord32 TargetWidth() = 0;
+    virtual WebRtc_UWord32 TargetHeight() = 0;
+    virtual WebRtc_Word32 Release() = 0;
+};
+
+class VPMSimpleSpatialResampler : public VPMSpatialResampler
+{
+public:
+    VPMSimpleSpatialResampler();
+    ~VPMSimpleSpatialResampler();
+    virtual WebRtc_Word32 SetTargetFrameSize(WebRtc_UWord32 width,
+                                             WebRtc_UWord32 height);
+    virtual void SetInputFrameResampleMode(VideoFrameResampling resamplingMode);
+    virtual void Reset();
+    virtual WebRtc_Word32 ResampleFrame(const VideoFrame& inFrame,
+                                        VideoFrame& outFrame);
+    virtual WebRtc_UWord32 TargetWidth();
+    virtual WebRtc_UWord32 TargetHeight();
+    virtual WebRtc_Word32 Release();
+
+private:
+    WebRtc_Word32 UpsampleFrame(const VideoFrame& inFrame, VideoFrame& outFrame);
+    WebRtc_Word32 CropSize(WebRtc_UWord32 width, WebRtc_UWord32 height,
+                           WebRtc_UWord32& croppedWidth,
+                           WebRtc_UWord32& croppedHeight) const;
+    WebRtc_Word32 SubsampleMultipleOf2(VideoFrame& frame);
+    bool ExactMultiplier(WebRtc_UWord32 width, WebRtc_UWord32 height) const;
+    WebRtc_Word32 BiLinearInterpolation(const VideoFrame& inFrame,
+                                        VideoFrame& outFrame);
+
+
+    VideoFrameResampling         _resamplingMode;
+    WebRtc_UWord32               _targetWidth;
+    WebRtc_UWord32               _targetHeight;
+    interpolator*                _interpolatorPtr;
+};
+
+} //namespace
+
+#endif

modules/video_processing/main/source/video_decimator.cc

@@ -0,0 +1,235 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "video_decimator.h"
+#include "tick_util.h"
+#include "video_processing.h"
+
+#define VD_MIN(a, b) ((a) < (b)) ? (a) : (b)
+
+namespace webrtc {
+
+VPMVideoDecimator::VPMVideoDecimator()
+:
+_overShootModifier(0),
+_dropCount(0),
+_keepCount(0),
+_targetFrameRate(30),
+_incomingFrameRate(0.0f),
+_maxFrameRate(30),
+_incomingFrameTimes(),
+_enableTemporalDecimation(true)
+{
+    Reset();
+}
+
+VPMVideoDecimator::~VPMVideoDecimator()
+{
+	//
+}
+
+void
+VPMVideoDecimator::Reset() 
+{
+   _overShootModifier = 0;
+    _dropCount = 0;
+    _keepCount = 0;
+    _targetFrameRate = 30;
+    _incomingFrameRate = 0.0f;
+    _maxFrameRate = 30;
+    memset(_incomingFrameTimes, 0, sizeof(_incomingFrameTimes));
+    _enableTemporalDecimation = true;
+}
+
+void
+VPMVideoDecimator::EnableTemporalDecimation(bool enable)
+{
+    _enableTemporalDecimation = enable;
+}
+WebRtc_Word32
+VPMVideoDecimator::SetMaxFrameRate(WebRtc_UWord32 maxFrameRate)
+{
+    if (maxFrameRate == 0)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+
+    _maxFrameRate = maxFrameRate;
+    
+    if (_targetFrameRate > _maxFrameRate)
+    {
+        _targetFrameRate = _maxFrameRate;
+
+    }
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VPMVideoDecimator::SetTargetFrameRate(WebRtc_UWord32 frameRate)
+{
+    if (frameRate == 0)
+    {
+        return VPM_PARAMETER_ERROR;
+    }
+    if (frameRate > _maxFrameRate)
+    {
+        //override
+        _targetFrameRate = _maxFrameRate;
+    }
+    else
+    {
+        _targetFrameRate = frameRate;
+    }
+    return VPM_OK;
+}
+
+bool
+VPMVideoDecimator::DropFrame()
+{
+    if (!_enableTemporalDecimation)
+    {
+        return false;
+    }
+
+    if (_incomingFrameRate <= 0)
+    {
+        return false;
+    }
+
+    const WebRtc_UWord32 incomingFrameRate = static_cast<WebRtc_UWord32>(_incomingFrameRate + 0.5f);
+
+    if (_targetFrameRate == 0)
+    {
+        return true;
+    }
+    
+    bool drop = false; 
+    if (incomingFrameRate > _targetFrameRate)
+    {       
+        WebRtc_Word32 overshoot = _overShootModifier + (incomingFrameRate - _targetFrameRate);
+        if(overshoot < 0)
+        {
+            overshoot = 0;
+            _overShootModifier = 0;
+        }
+        
+        if (overshoot && 2 * overshoot < (WebRtc_Word32) incomingFrameRate)
+        {
+
+            if (_dropCount) // Just got here so drop to be sure.
+            {
+                _dropCount = 0;         
+                return true;
+            }                        
+            const WebRtc_UWord32 dropVar = incomingFrameRate / overshoot;
+
+            if (_keepCount >= dropVar)
+            {
+                drop = true;                           
+                _overShootModifier = -((WebRtc_Word32) incomingFrameRate % overshoot) / 3;
+                _keepCount = 1;
+            }
+            else
+            {                        
+                
+                _keepCount++;
+            }
+        }
+        else
+        {
+            _keepCount = 0;         
+            const WebRtc_UWord32 dropVar = overshoot / _targetFrameRate;
+            if (_dropCount < dropVar)
+            {                
+                drop = true;
+                _dropCount++;                
+            }
+            else
+            {
+                _overShootModifier = overshoot % _targetFrameRate;
+                drop = false;
+                _dropCount = 0;                
+            }
+        }
+    }
+
+    return drop;
+}
+
+
+WebRtc_UWord32
+VPMVideoDecimator::DecimatedFrameRate()
+{
+    ProcessIncomingFrameRate(TickTime::MillisecondTimestamp());
+    if (!_enableTemporalDecimation)
+    {
+        return static_cast<WebRtc_UWord32>(_incomingFrameRate + 0.5f);
+    }
+    return VD_MIN(_targetFrameRate, static_cast<WebRtc_UWord32>(_incomingFrameRate + 0.5f));
+}
+
+WebRtc_UWord32
+VPMVideoDecimator::InputFrameRate()
+{
+    ProcessIncomingFrameRate(TickTime::MillisecondTimestamp());
+    return static_cast<WebRtc_UWord32>(_incomingFrameRate + 0.5f);
+}
+
+void
+VPMVideoDecimator::UpdateIncomingFrameRate()
+{
+   WebRtc_Word64 now = TickTime::MillisecondTimestamp();
+    if(_incomingFrameTimes[0] == 0)
+    {
+        // first no shift
+    } else
+    {
+        // shift 
+        for(int i = (kFrameCountHistorySize - 2); i >= 0 ; i--)
+        {
+            _incomingFrameTimes[i+1] = _incomingFrameTimes[i];
+        }
+    }
+    _incomingFrameTimes[0] = now;
+    ProcessIncomingFrameRate(now);
+}
+
+void 
+VPMVideoDecimator::ProcessIncomingFrameRate(WebRtc_Word64 now)
+{
+   WebRtc_Word32 num = 0;
+    WebRtc_Word32 nrOfFrames = 0;
+    for(num = 1; num < (kFrameCountHistorySize - 1); num++)
+    {
+        if (_incomingFrameTimes[num] <= 0 ||
+            now - _incomingFrameTimes[num] > kFrameHistoryWindowMs) // don't use data older than 2sec
+        {
+            break;
+        } else
+        {
+            nrOfFrames++;
+        }
+    }
+    if (num > 1)
+    {
+        WebRtc_Word64 diff = now - _incomingFrameTimes[num-1];
+        _incomingFrameRate = 1.0;
+        if(diff >0)
+        {
+            _incomingFrameRate = nrOfFrames * 1000.0f / static_cast<float>(diff);
+        }
+    }
+    else
+    {
+        _incomingFrameRate = static_cast<float>(nrOfFrames);
+    }
+}
+
+} //namespace

modules/video_processing/main/source/video_decimator.h

@@ -0,0 +1,65 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * video_decimator.h
+ */
+#ifndef VPM_VIDEO_DECIMATOR_H
+#define VPM_VIDEO_DECIMATOR_H
+
+#include "typedefs.h"
+#include "module_common_types.h"
+
+namespace webrtc {
+
+class VPMVideoDecimator
+{
+public:
+    VPMVideoDecimator();
+    ~VPMVideoDecimator();
+    
+    void Reset();
+    
+    void EnableTemporalDecimation(bool enable);
+    
+    WebRtc_Word32 SetMaxFrameRate(WebRtc_UWord32 maxFrameRate);
+    WebRtc_Word32 SetTargetFrameRate(WebRtc_UWord32 frameRate);
+
+    bool DropFrame();
+    
+    void UpdateIncomingFrameRate();
+
+    // Get Decimated Frame Rate/Dimensions
+    WebRtc_UWord32 DecimatedFrameRate();
+
+    //Get input frame rate
+    WebRtc_UWord32 InputFrameRate();
+
+private:
+    void ProcessIncomingFrameRate(WebRtc_Word64 now);
+
+    enum { kFrameCountHistorySize = 90};
+    enum { kFrameHistoryWindowMs = 2000};
+
+    // Temporal decimation
+    WebRtc_Word32         _overShootModifier;
+    WebRtc_UWord32        _dropCount;
+    WebRtc_UWord32        _keepCount;
+    WebRtc_UWord32        _targetFrameRate;
+    float               _incomingFrameRate;
+    WebRtc_UWord32        _maxFrameRate;
+    WebRtc_Word64         _incomingFrameTimes[kFrameCountHistorySize];
+    bool                _enableTemporalDecimation;
+
+};
+
+} //namespace
+
+#endif

modules/video_processing/main/source/video_processing.gyp

@@ -0,0 +1,63 @@
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'includes': [
+    '../../../../common_settings.gypi', # Common settings
+  ],
+  'targets': [
+    {
+      'target_name': 'video_processing',
+      'type': '<(library)',
+      'dependencies': [
+        '../../../../common_audio/signal_processing_library/main/source/spl.gyp:spl',
+        '../../../../common_video/vplib/main/source/vplib.gyp:webrtc_vplib',
+        '../../../../system_wrappers/source/system_wrappers.gyp:system_wrappers',
+        '../../../utility/source/utility.gyp:webrtc_utility',
+      ],
+      'include_dirs': [
+        '../interface',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../interface',
+        ],
+      },
+      'sources': [
+        # interfaces
+        '../interface/video_processing.h',
+        '../interface/video_processing_defines.h',
+
+        # headers
+        'video_processing_impl.h',
+        'brightness_detection.h',
+        'color_enhancement.h',
+        'color_enhancement_private.h',
+        'content_analysis.h',
+        'deflickering.h',
+        'denoising.h',
+        'frame_preprocessor.h',
+        'spatial_resampler.h',
+        'video_decimator.h',
+
+        # sources
+        'video_processing_impl.cc',
+        'brightness_detection.cc',
+        'color_enhancement.cc',
+        'content_analysis.cc',
+        'deflickering.cc',
+        'denoising.cc',
+        'frame_preprocessor.cc',
+        'spatial_resampler.cc',
+        'video_decimator.cc',
+      ], # source
+    },
+  ],
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2:

modules/video_processing/main/source/video_processing_impl.cc

@@ -0,0 +1,368 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "video_processing_impl.h"
+#include "critical_section_wrapper.h"
+#include "trace.h"
+
+#include <cassert>
+
+namespace webrtc {
+
+namespace
+{
+    void
+    SetSubSampling(VideoProcessingModule::FrameStats& stats,
+                   const WebRtc_Word32 width,
+                   const WebRtc_Word32 height)
+    {
+        if (width * height >= 640 * 480)
+        {
+            stats.subSamplWidth = 3; 
+            stats.subSamplHeight = 3;
+        }
+        else if (width * height >= 352 * 288)
+        {
+            stats.subSamplWidth = 2; 
+            stats.subSamplHeight = 2;
+        }
+        else if (width * height >= 176 * 144)
+        {
+            stats.subSamplWidth = 1; 
+            stats.subSamplHeight = 1;
+        }
+        else
+        {
+            stats.subSamplWidth = 0; 
+            stats.subSamplHeight = 0;
+        }
+    }
+}
+
+VideoProcessingModule*
+VideoProcessingModule::Create(const WebRtc_Word32 id)
+{
+    WEBRTC_TRACE(webrtc::kTraceModuleCall, webrtc::kTraceVideoPreocessing, id, 
+               "VideoProcessingModule::Create()");
+
+    return new VideoProcessingModuleImpl(id);
+}
+
+void
+VideoProcessingModule::Destroy(VideoProcessingModule* module)
+{
+    if (module)
+    {
+        WEBRTC_TRACE(webrtc::kTraceModuleCall, webrtc::kTraceVideoPreocessing,
+            static_cast<VideoProcessingModuleImpl*>(module)->Id(),
+                "VideoProcessingModule::destroy()");
+        delete static_cast<VideoProcessingModuleImpl*>(module);
+    }
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::ChangeUniqueId(const WebRtc_Word32 id)
+{
+    CriticalSectionScoped mutex(_mutex);
+    WEBRTC_TRACE(webrtc::kTraceModuleCall, webrtc::kTraceVideoPreocessing, _id, "ChangeUniqueId(new id:%d)", id);   
+    _id = id;
+    _brightnessDetection.ChangeUniqueId(id);
+    _deflickering.ChangeUniqueId(id);
+    _denoising.ChangeUniqueId(id);
+    _framePreProcessor.ChangeUniqueId(id);
+    return VPM_OK;
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Version(WebRtc_Word8* version,
+                                       WebRtc_UWord32& remainingBufferInBytes,
+                                       WebRtc_UWord32& position) const
+{
+    CriticalSectionScoped mutex(_mutex);
+    WEBRTC_TRACE(webrtc::kTraceModuleCall, webrtc::kTraceVideoPreocessing, _id, "Version(bufferLength:%d)",
+        remainingBufferInBytes);
+    return GetVersion(version, remainingBufferInBytes, position);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Id() const
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _id;
+}
+
+WebRtc_Word32
+VideoProcessingModule::GetVersion(WebRtc_Word8* version,
+                                      WebRtc_UWord32& remainingBufferInBytes,
+                                      WebRtc_UWord32& position)
+{
+    if (version == NULL)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1,
+            "Null version pointer");
+        return -1;
+    }
+    WebRtc_Word8 ourVersion[] = "VideoProcessingModule 1.1.0";
+    WebRtc_UWord32 ourLength = (WebRtc_UWord32)sizeof(ourVersion); // Includes null termination.
+    if (remainingBufferInBytes < ourLength)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1,
+            "Buffer of insufficient length");
+        return VPM_PARAMETER_ERROR;
+    }
+    memcpy(&version[position], ourVersion, ourLength);
+    remainingBufferInBytes -= ourLength;
+    position += ourLength;
+
+    return VPM_OK;
+}
+
+VideoProcessingModuleImpl::VideoProcessingModuleImpl(const WebRtc_Word32 id) :
+    _id(id),
+    _mutex(*CriticalSectionWrapper::CreateCriticalSection())
+{
+    _brightnessDetection.ChangeUniqueId(id);
+    _deflickering.ChangeUniqueId(id);
+    _denoising.ChangeUniqueId(id);
+    _framePreProcessor.ChangeUniqueId(id);
+    WEBRTC_TRACE(webrtc::kTraceMemory, webrtc::kTraceVideoPreocessing, _id, "Created");
+}
+
+
+VideoProcessingModuleImpl::~VideoProcessingModuleImpl()
+{
+    WEBRTC_TRACE(webrtc::kTraceMemory, webrtc::kTraceVideoPreocessing, _id, "Destroyed");
+    
+    delete &_mutex;
+}
+
+void
+VideoProcessingModuleImpl::Reset()
+{
+    CriticalSectionScoped mutex(_mutex);
+    _deflickering.Reset();
+    _denoising.Reset();
+    _brightnessDetection.Reset();
+    _framePreProcessor.Reset();
+
+}
+
+WebRtc_Word32
+VideoProcessingModule::GetFrameStats(FrameStats& stats,
+                                         const VideoFrame& frame)
+{
+    return GetFrameStats(stats, frame.Buffer(), frame.Width(), frame.Height());
+}
+
+WebRtc_Word32
+VideoProcessingModule::GetFrameStats(FrameStats& stats,
+                                         const WebRtc_UWord8* frame,
+                                         const WebRtc_UWord32 width,
+                                         const WebRtc_UWord32 height)
+{
+    if (frame == NULL)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1, "Null frame pointer");
+        return VPM_PARAMETER_ERROR;
+    }
+    
+    if (width == 0 || height == 0)
+    {
+        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoPreocessing, -1, "Invalid frame size");
+        return VPM_PARAMETER_ERROR;
+    }
+
+    ClearFrameStats(stats); // The histogram needs to be zeroed out.
+    SetSubSampling(stats, width, height);
+
+    // Compute histogram and sum of frame
+    for (WebRtc_UWord32 i = 0; i < height; i += (1 << stats.subSamplHeight))
+    {
+        WebRtc_Word32 k = i * width;
+        for (WebRtc_UWord32 j = 0; j < width; j += (1 << stats.subSamplWidth))
+        { 
+            stats.hist[frame[k + j]]++;
+            stats.sum += frame[k + j];
+        }
+    }
+
+    stats.numPixels = (width * height) / ((1 << stats.subSamplWidth) * (1 << stats.subSamplHeight));
+    assert(stats.numPixels > 0);
+
+    // Compute mean value of frame
+    stats.mean = stats.sum / stats.numPixels;
+    
+    return VPM_OK;
+}
+
+bool
+VideoProcessingModule::ValidFrameStats(const FrameStats& stats)
+{
+    if (stats.numPixels == 0)
+    {
+        return false;
+    }
+
+    return true;
+}
+
+void
+VideoProcessingModule::ClearFrameStats(FrameStats& stats)
+{
+    stats.mean = 0;
+    stats.sum = 0;
+    stats.numPixels = 0;
+    stats.subSamplWidth = 0;
+    stats.subSamplHeight = 0;
+    memset(stats.hist, 0, sizeof(stats.hist));
+}
+
+WebRtc_Word32
+VideoProcessingModule::ColorEnhancement(VideoFrame& frame)
+{
+    return ColorEnhancement(frame.Buffer(), frame.Width(), frame.Height());
+}
+
+WebRtc_Word32
+VideoProcessingModule::ColorEnhancement(WebRtc_UWord8* frame,
+                                            const WebRtc_UWord32 width,
+                                            const WebRtc_UWord32 height)
+{
+    return VideoProcessing::ColorEnhancement(frame, width, height);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Deflickering(VideoFrame& frame,
+                                            FrameStats& stats)
+{
+    return Deflickering(frame.Buffer(), frame.Width(), frame.Height(), 
+        frame.TimeStamp(), stats);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Deflickering(WebRtc_UWord8* frame,
+                                            const WebRtc_UWord32 width,
+                                            const WebRtc_UWord32 height,
+                                            const WebRtc_UWord32 timestamp,
+                                            FrameStats& stats)
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _deflickering.ProcessFrame(frame, width, height, timestamp, stats);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Denoising(VideoFrame& frame)
+{
+    return Denoising(frame.Buffer(), frame.Width(), frame.Height());
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::Denoising(WebRtc_UWord8* frame,
+                                         const WebRtc_UWord32 width,
+                                         const WebRtc_UWord32 height)
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _denoising.ProcessFrame(frame, width, height);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::BrightnessDetection(const VideoFrame& frame,
+                                                   const FrameStats& stats)
+{
+    return BrightnessDetection(frame.Buffer(), frame.Width(), frame.Height(), stats);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::BrightnessDetection(const WebRtc_UWord8* frame,
+                                                   const WebRtc_UWord32 width,
+                                                   const WebRtc_UWord32 height,
+                                                   const FrameStats& stats)
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _brightnessDetection.ProcessFrame(frame, width, height, stats);
+}
+
+
+void 
+VideoProcessingModuleImpl::EnableTemporalDecimation(bool enable)
+{
+    CriticalSectionScoped mutex(_mutex);
+    _framePreProcessor.EnableTemporalDecimation(enable);
+}
+
+
+void 
+VideoProcessingModuleImpl::SetInputFrameResampleMode(VideoFrameResampling resamplingMode)
+{
+    CriticalSectionScoped cs(_mutex);
+    _framePreProcessor.SetInputFrameResampleMode(resamplingMode);
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::SetMaxFrameRate(WebRtc_UWord32 maxFrameRate)
+{
+    CriticalSectionScoped cs(_mutex);
+    return _framePreProcessor.SetMaxFrameRate(maxFrameRate);
+
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::SetTargetResolution(WebRtc_UWord32 width, WebRtc_UWord32 height, WebRtc_UWord32 frameRate)
+{
+    CriticalSectionScoped cs(_mutex);
+    return _framePreProcessor.SetTargetResolution(width, height, frameRate);
+}
+
+
+WebRtc_UWord32
+VideoProcessingModuleImpl::DecimatedFrameRate()
+{
+    CriticalSectionScoped cs(_mutex);
+    return  _framePreProcessor.DecimatedFrameRate();
+}
+
+
+WebRtc_UWord32
+VideoProcessingModuleImpl::DecimatedWidth() const
+{
+    CriticalSectionScoped cs(_mutex);
+    return _framePreProcessor.DecimatedWidth();
+}
+
+WebRtc_UWord32
+VideoProcessingModuleImpl::DecimatedHeight() const
+{
+    CriticalSectionScoped cs(_mutex);
+    return _framePreProcessor.DecimatedHeight();
+}
+
+WebRtc_Word32
+VideoProcessingModuleImpl::PreprocessFrame(const VideoFrame *frame, VideoFrame **processedFrame)
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _framePreProcessor.PreprocessFrame(frame, processedFrame);
+}
+
+VideoContentMetrics*
+VideoProcessingModuleImpl::ContentMetrics() const
+{
+    CriticalSectionScoped mutex(_mutex);
+    return _framePreProcessor.ContentMetrics();
+}
+
+
+void
+VideoProcessingModuleImpl::EnableContentAnalysis(bool enable)
+{
+    CriticalSectionScoped mutex(_mutex);
+    _framePreProcessor.EnableContentAnalysis(enable);
+}
+
+} //namespace

modules/video_processing/main/source/video_processing_impl.h

@@ -0,0 +1,106 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * video_processing_impl.h
+ */
+#ifndef WEBRTC_MODULE_VIDEO_PROCESSING_IMPL_H
+#define WEBRTC_MODULE_VIDEO_PROCESSING_IMPL_H
+
+#include "video_processing.h"
+#include "brightness_detection.h"
+#include "color_enhancement.h"
+#include "deflickering.h"
+#include "denoising.h"
+#include "frame_preprocessor.h"
+
+namespace webrtc {
+class CriticalSectionWrapper;
+
+class VideoProcessingModuleImpl : public VideoProcessingModule
+{
+public:
+  
+    VideoProcessingModuleImpl(WebRtc_Word32 id);
+    
+    virtual ~VideoProcessingModuleImpl();
+
+    virtual WebRtc_Word32 Version(WebRtc_Word8* version,
+                                WebRtc_UWord32& remainingBufferInBytes,
+                                WebRtc_UWord32& position) const;
+
+    WebRtc_Word32 Id() const;
+
+    virtual WebRtc_Word32 ChangeUniqueId(const WebRtc_Word32 id);
+
+    virtual void Reset();
+
+    virtual WebRtc_Word32 Deflickering(WebRtc_UWord8* frame,
+                                     WebRtc_UWord32 width,
+                                     WebRtc_UWord32 height,
+                                     WebRtc_UWord32 timestamp,
+                                     FrameStats& stats);
+    
+    virtual WebRtc_Word32 Deflickering(VideoFrame& frame,
+                                     FrameStats& stats);
+
+    virtual WebRtc_Word32 Denoising(WebRtc_UWord8* frame,
+                                  WebRtc_UWord32 width,
+                                  WebRtc_UWord32 height);
+    
+    virtual WebRtc_Word32 Denoising(VideoFrame& frame);
+
+    virtual WebRtc_Word32 BrightnessDetection(const WebRtc_UWord8* frame,
+                                            WebRtc_UWord32 width,
+                                            WebRtc_UWord32 height,
+                                            const FrameStats& stats);
+
+    virtual WebRtc_Word32 BrightnessDetection(const VideoFrame& frame,
+                                            const FrameStats& stats);
+
+
+    //Frame pre-processor functions
+
+    //Enable temporal decimation
+    virtual void EnableTemporalDecimation(bool enable);
+
+    virtual void SetInputFrameResampleMode(VideoFrameResampling resamplingMode);
+
+    //Enable content analysis
+    virtual void EnableContentAnalysis(bool enable);
+
+    //Set max frame rate
+    virtual WebRtc_Word32 SetMaxFrameRate(WebRtc_UWord32 maxFrameRate);
+	
+    // Set Target Resolution: frame rate and dimension
+    virtual WebRtc_Word32 SetTargetResolution(WebRtc_UWord32 width, WebRtc_UWord32 height, WebRtc_UWord32 frameRate);
+
+    // Get decimated values: frame rate/dimension
+    virtual WebRtc_UWord32 DecimatedFrameRate();
+    virtual WebRtc_UWord32 DecimatedWidth() const;
+    virtual WebRtc_UWord32 DecimatedHeight() const;
+
+    // Preprocess:
+    virtual WebRtc_Word32 PreprocessFrame(const VideoFrame* frame, VideoFrame** processedFrame);
+    virtual VideoContentMetrics* ContentMetrics() const;
+
+private:
+    WebRtc_Word32            _id;
+    CriticalSectionWrapper&   _mutex;
+    
+    VPMDeflickering            _deflickering;
+    VPMDenoising               _denoising;
+    VPMBrightnessDetection     _brightnessDetection;
+    VPMFramePreprocessor       _framePreProcessor;
+};
+
+} // namespace
+
+#endif

modules/video_processing/main/test/unit_test/brightness_detection_test.cc

@@ -0,0 +1,107 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "unit_test.h"
+#include "video_processing.h"
+
+using namespace webrtc;
+
+TEST_F(VideoProcessingModuleTest, BrightnessDetection)
+{
+    WebRtc_UWord32 frameNum = 0;
+    WebRtc_Word32 brightnessWarning = 0;
+    WebRtc_UWord32 warningCount = 0;
+    while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength)
+    {
+        frameNum++;
+        VideoProcessingModule::FrameStats stats;
+        ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+        ASSERT_GE(brightnessWarning = _vpm->BrightnessDetection(_videoFrame, stats), 0);
+        if (brightnessWarning != VideoProcessingModule::kNoWarning)
+        {
+            warningCount++;
+        }
+    }
+    ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+    // Expect few warnings
+    float warningProportion = static_cast<float>(warningCount) / frameNum * 100;
+    printf("\nWarning proportions:\n");
+    printf("Stock foreman: %.1f %%\n", warningProportion);
+    EXPECT_LT(warningProportion, 10);
+
+    rewind(_sourceFile);
+    frameNum = 0;
+    warningCount = 0;
+    while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength &&
+        frameNum < 300)
+    {
+        frameNum++;
+
+        WebRtc_UWord8* frame = _videoFrame.Buffer();
+        WebRtc_UWord32 yTmp = 0;
+        for (WebRtc_UWord32 yIdx = 0; yIdx < _width * _height; yIdx++)
+        {
+            yTmp = frame[yIdx] << 1;
+            if (yTmp > 255)
+            {
+                yTmp = 255;
+            }
+            frame[yIdx] = static_cast<WebRtc_UWord8>(yTmp);
+        }
+
+        VideoProcessingModule::FrameStats stats;
+        ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+        ASSERT_GE(brightnessWarning = _vpm->BrightnessDetection(_videoFrame, stats), 0);
+        EXPECT_NE(VideoProcessingModule::kDarkWarning, brightnessWarning);
+        if (brightnessWarning == VideoProcessingModule::kBrightWarning)
+        {
+            warningCount++;
+        }
+    }
+    ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+    // Expect many brightness warnings
+    warningProportion = static_cast<float>(warningCount) / frameNum * 100;
+    printf("Bright foreman: %.1f %%\n", warningProportion);
+    EXPECT_GT(warningProportion, 95);
+
+    rewind(_sourceFile);
+    frameNum = 0;
+    warningCount = 0;
+    while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength &&
+        frameNum < 300)
+    {
+        frameNum++;
+
+        WebRtc_UWord8* frame = _videoFrame.Buffer();
+        WebRtc_Word32 yTmp = 0;
+        for (WebRtc_UWord32 yIdx = 0; yIdx < _width * _height; yIdx++)
+        {
+            yTmp = frame[yIdx] >> 1;
+            frame[yIdx] = static_cast<WebRtc_UWord8>(yTmp);
+        }
+
+        VideoProcessingModule::FrameStats stats;
+        ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+        ASSERT_GE(brightnessWarning = _vpm->BrightnessDetection(_videoFrame, stats), 0);
+        EXPECT_NE(VideoProcessingModule::kBrightWarning, brightnessWarning);
+        if (brightnessWarning == VideoProcessingModule::kDarkWarning)
+        {
+            warningCount++;
+        }
+    }
+    ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+    // Expect many darkness warnings
+    warningProportion = static_cast<float>(warningCount) / frameNum * 100;
+    printf("Dark foreman: %.1f %%\n\n", warningProportion);
+    EXPECT_GT(warningProportion, 90);
+}

modules/video_processing/main/test/unit_test/color_enhancement_test.cc

@@ -0,0 +1,109 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "unit_test.h"
+#include "video_processing.h"
+#include "vplib.h"
+#include "tick_util.h"
+
+#include <cstdio>
+#include <cstdlib>
+
+using namespace webrtc;
+
+TEST_F(VideoProcessingModuleTest, ColorEnhancement)
+{
+    TickTime t0;
+    TickTime t1;
+    TickInterval accTicks;
+
+    FILE* modFile = fopen("foremanColorEnhancedVPM.yuv", "w+b");
+    ASSERT_TRUE(modFile != NULL) << "Could not open output file.\n";
+        
+    WebRtc_UWord32 frameNum = 0;
+    while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength)
+    {
+        frameNum++;
+        t0 = TickTime::Now();
+        ASSERT_EQ(0, VideoProcessingModule::ColorEnhancement(_videoFrame));
+        t1 = TickTime::Now();
+        accTicks += t1 - t0;
+        fwrite(_videoFrame.Buffer(), 1, _frameLength, modFile);
+    }
+    ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+    printf("\nTime per frame: %d us \n", 
+        static_cast<int>(accTicks.Microseconds() / frameNum));
+    rewind(modFile);
+
+    printf("Comparing files...\n\n");
+    FILE* refFile = fopen("foremanColorEnhanced.yuv", "rb");
+    ASSERT_TRUE(refFile != NULL) << "Cannot open reference file foremanColorEnhanced.yuv\n"
+        "Create the reference by running Matlab script createTable.m.";
+
+    // get file lenghts
+    ASSERT_EQ(0, fseek(refFile, 0L, SEEK_END));
+    long refLen = ftell(refFile);
+    ASSERT_NE(-1L, refLen);
+    rewind(refFile);
+    ASSERT_EQ(0, fseek(modFile, 0L, SEEK_END));
+    long testLen = ftell(modFile);
+    ASSERT_NE(-1L, testLen);
+    rewind(modFile);
+    ASSERT_EQ(refLen, testLen) << "File lengths differ.";
+	
+    VideoFrame refVideoFrame;
+    refVideoFrame.VerifyAndAllocate(_frameLength);
+    refVideoFrame.SetWidth(_width);
+    refVideoFrame.SetHeight(_height);
+
+    // Compare frame-by-frame.
+    while (fread(_videoFrame.Buffer(), 1, _frameLength, modFile) == _frameLength)
+    {
+        ASSERT_EQ(_frameLength, fread(refVideoFrame.Buffer(), 1, _frameLength, refFile));
+        EXPECT_EQ(0, memcmp(_videoFrame.Buffer(), refVideoFrame.Buffer(), _frameLength));
+    }
+    ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+    // Verify that all color pixels are enhanced, that no luminance values are altered,
+    // and that the function does not write outside the vector.
+    WebRtc_UWord32 safeGuard = 1000;
+    WebRtc_UWord32 numPixels = 352*288; // CIF size
+    WebRtc_UWord8 *testFrame = new WebRtc_UWord8[numPixels + (numPixels / 2) + (2 * safeGuard)];
+    WebRtc_UWord8 *refFrame = new WebRtc_UWord8[numPixels + (numPixels / 2) + (2 * safeGuard)];
+
+    // use value 128 as probe value, since we know that this will be changed in the enhancement
+    memset(testFrame, 128, safeGuard);
+    memset(&testFrame[safeGuard], 128, numPixels);
+    memset(&testFrame[safeGuard + numPixels], 128, numPixels / 2);
+    memset(&testFrame[safeGuard + numPixels + (numPixels / 2)], 128, safeGuard);
+
+    memcpy(refFrame, testFrame, numPixels + (numPixels / 2) + (2 * safeGuard));
+
+    ASSERT_EQ(0, VideoProcessingModule::ColorEnhancement(&testFrame[safeGuard], 352, 288));
+
+    EXPECT_EQ(0, memcmp(testFrame, refFrame, safeGuard)) <<
+        "Function is writing outside the frame memory.";
+    
+    EXPECT_EQ(0, memcmp(&testFrame[safeGuard + numPixels + (numPixels / 2)], 
+        &refFrame[safeGuard + numPixels + (numPixels / 2)], safeGuard)) <<
+        "Function is writing outside the frame memory.";
+
+    EXPECT_EQ(0, memcmp(&testFrame[safeGuard], &refFrame[safeGuard], numPixels)) <<
+        "Function is modifying the luminance.";
+
+    EXPECT_NE(0, memcmp(&testFrame[safeGuard + numPixels],
+        &refFrame[safeGuard + numPixels], numPixels / 2)) <<
+        "Function is not modifying all chrominance pixels";
+
+    delete [] testFrame;
+    delete [] refFrame;
+}
+

modules/video_processing/main/test/unit_test/createTable.m

@@ -0,0 +1,179 @@
+% Create the color enhancement look-up table and write it to
+% file colorEnhancementTable.cpp. Copy contents of that file into
+% the source file for the color enhancement function.
+
+clear
+close all
+
+
+% First, define the color enhancement in a normalized domain
+
+% Compander function is defined in three radial zones.
+% 1. From 0 to radius r0, the compander function
+% is a second-order polynomial intersecting the points (0,0)
+% and (r0, r0), and with a slope B in (0,0).
+% 2. From r0 to r1, the compander is a third-order polynomial
+% intersecting the points (r0, r0) and (r1, r1), and with the
+% same slope as the first part in the point (r0, r0) and slope
+% equal to 1 in (r1, r1).
+% 3. For radii larger than r1, the compander function is the
+% unity scale function (no scaling at all).
+
+r0=0.07; % Dead zone radius (must be > 0)
+r1=0.6; % Enhancement zone radius (must be > r0 and < 1)
+B=0.2; % initial slope of compander function (between 0 and 1)
+
+x0=linspace(0,r0).'; % zone 1
+x1=linspace(r0,r1).'; % zone 2
+x2=linspace(r1,1).'; % zone 3
+
+A=(1-B)/r0;
+f0=A*x0.^2+B*x0; % compander function in zone 1
+
+% equation system for finding second zone parameters
+M=[r0^3 r0^2 r0 1; 
+    3*r0^2 2*r0 1 0;
+    3*r1^2 2*r1 1 0;
+    r1^3 r1^2 r1 1];
+m=[A*r0^2+B*r0; 2*A*r0+B; 1; r1];
+% solve equations
+theta=M\m;
+
+% compander function in zone 1
+f1=[x1.^3 x1.^2 x1 ones(size(x1))]*theta;
+
+x=[x0; x1; x2];
+f=[f0; f1; x2];
+
+% plot it
+figure(1)
+plot(x,f,x,x,':')
+xlabel('Normalized radius')
+ylabel('Modified radius')
+
+
+% Now, create the look-up table in the integer color space
+[U,V]=meshgrid(0:255, 0:255); % U-V space
+U0=U;
+V0=V;
+
+% Conversion matrix from normalized YUV to RGB
+T=[1 0 1.13983; 1 -0.39465 -0.58060; 1 2.03211 0];
+Ylum=0.5;
+
+figure(2)
+Z(:,:,1)=Ylum + (U-127)/256*T(1,2) + (V-127)/256*T(1,3);
+Z(:,:,2)=Ylum + (U-127)/256*T(2,2) + (V-127)/256*T(2,3);
+Z(:,:,3)=Ylum + (U-127)/256*T(3,2) + (V-127)/256*T(3,3);
+Z=max(Z,0);
+Z=min(Z,1);
+subplot(121)
+image(Z);
+axis square
+axis off
+set(gcf,'color','k')
+
+R = sqrt((U-127).^2 + (V-127).^2);
+Rnorm = R/127;
+RnormMod = Rnorm;
+RnormMod(RnormMod==0)=1; % avoid division with zero
+
+% find indices to pixels in dead-zone (zone 1)
+ix=find(Rnorm<=r0);
+scaleMatrix = (A*Rnorm(ix).^2 + B*Rnorm(ix))./RnormMod(ix);
+U(ix)=(U(ix)-127).*scaleMatrix+127;
+V(ix)=(V(ix)-127).*scaleMatrix+127;
+
+% find indices to pixels in zone 2
+ix=find(Rnorm>r0 & Rnorm<=r1);
+scaleMatrix = (theta(1)*Rnorm(ix).^3 + theta(2)*Rnorm(ix).^2 + ...
+    theta(3)*Rnorm(ix) + theta(4)) ./ RnormMod(ix);
+U(ix)=(U(ix)-127).*scaleMatrix + 127;
+V(ix)=(V(ix)-127).*scaleMatrix + 127;
+
+% round to integer values and saturate
+U=round(U);
+V=round(V);
+U=max(min(U,255),0);
+V=max(min(V,255),0);
+
+Z(:,:,1)=Ylum + (U-127)/256*T(1,2) + (V-127)/256*T(1,3);
+Z(:,:,2)=Ylum + (U-127)/256*T(2,2) + (V-127)/256*T(2,3);
+Z(:,:,3)=Ylum + (U-127)/256*T(3,2) + (V-127)/256*T(3,3);
+Z=max(Z,0);
+Z=min(Z,1);
+subplot(122)
+image(Z);
+axis square
+axis off
+
+figure(3)
+subplot(121)
+mesh(U-U0)
+subplot(122)
+mesh(V-V0)
+
+
+
+% Last, write to file
+% Write only one matrix, since U=V'
+
+fid = fopen('../out/Debug/colorEnhancementTable.h','wt');
+if fid==-1
+    error('Cannot open file colorEnhancementTable.cpp');
+end
+
+fprintf(fid,'//colorEnhancementTable.h\n\n');
+fprintf(fid,'//Copy the constant table to the appropriate header file.\n\n');
+
+fprintf(fid,'//Table created with Matlab script createTable.m\n\n');
+fprintf(fid,'//Usage:\n');
+fprintf(fid,'//    Umod=colorTable[U][V]\n');
+fprintf(fid,'//    Vmod=colorTable[V][U]\n');
+
+fprintf(fid,'static unsigned char colorTable[%i][%i] = {\n', size(U,1), size(U,2));
+
+for u=1:size(U,2)
+    fprintf(fid,'    {%i', U(1,u));
+    for v=2:size(U,1)
+        fprintf(fid,', %i', U(v,u));
+    end
+    fprintf(fid,'}');
+    if u<size(U,2)
+        fprintf(fid,',');
+    end
+    fprintf(fid,'\n');
+end
+fprintf(fid,'};\n\n');
+fclose(fid);
+fprintf('done');
+
+
+answ=input('Create test vector (takes some time...)? y/n : ','s');
+if answ ~= 'y'
+    return
+end
+
+% Also, create test vectors
+
+% Read test file foreman.yuv
+fprintf('Reading test file...')
+[y,u,v]=readYUV420file('../out/Debug/testFiles/foreman_cif.yuv',352,288);
+fprintf(' done\n');
+unew=uint8(zeros(size(u)));
+vnew=uint8(zeros(size(v)));
+
+% traverse all frames
+for k=1:size(y,3)
+    fprintf('Frame %i\n', k);
+    for r=1:size(u,1)
+        for c=1:size(u,2)
+            unew(r,c,k) = uint8(U(double(v(r,c,k))+1, double(u(r,c,k))+1));
+            vnew(r,c,k) = uint8(V(double(v(r,c,k))+1, double(u(r,c,k))+1));
+        end
+    end
+end
+      
+fprintf('\nWriting modified test file...')
+writeYUV420file('../out/Debug/foremanColorEnhanced.yuv',y,unew,vnew);
+fprintf(' done\n');

modules/video_processing/main/test/unit_test/deflickering_test.cc

@@ -0,0 +1,81 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "unit_test.h"
+#include "video_processing.h"
+#include "tick_util.h"
+
+#include <cstdio>
+#include <cstdlib>
+
+using namespace webrtc;
+
+TEST_F(VideoProcessingModuleTest, Deflickering)
+{
+    enum { NumRuns = 30 };
+    WebRtc_UWord32 frameNum = 0;
+    const WebRtc_UWord32 frameRate = 15;
+
+    WebRtc_Word64 minRuntime = 0;
+    WebRtc_Word64 avgRuntime = 0;
+
+    // Close automatically opened Foreman.
+    fclose(_sourceFile);
+    _sourceFile  = fopen("deflicker_testfile_before.yuv", "rb");
+    ASSERT_TRUE(_sourceFile != NULL) <<
+        "Cannot read input file deflicker_testfile_before.yuv\n";
+
+    FILE* deflickerFile = fopen("deflicker_testfile.yuv", "wb");
+    ASSERT_TRUE(deflickerFile != NULL) << "Could not open output file.\n";
+
+    printf("\nRun time [us / frame]:\n");
+    for (WebRtc_UWord32 runIdx = 0; runIdx < NumRuns; runIdx++)
+    {
+        TickTime t0;
+        TickTime t1;
+        TickInterval accTicks;
+        WebRtc_UWord32 timeStamp = 1;
+
+        frameNum = 0;
+        while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength)
+        {
+            frameNum++;
+            _videoFrame.SetTimeStamp(timeStamp);
+
+            t0 = TickTime::Now();           
+            VideoProcessingModule::FrameStats stats;
+            ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+            ASSERT_EQ(0, _vpm->Deflickering(_videoFrame, stats));
+            t1 = TickTime::Now();
+            accTicks += t1 - t0;
+            
+            if (runIdx == 0)
+            {
+                fwrite(_videoFrame.Buffer(), 1, _frameLength, deflickerFile);
+            }
+            timeStamp += (90000 / frameRate);
+        }
+        ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+        printf("%u\n", static_cast<int>(accTicks.Microseconds() / frameNum));
+        if (accTicks.Microseconds() < minRuntime || runIdx == 0)
+        {
+            minRuntime = accTicks.Microseconds();
+        }
+        avgRuntime += accTicks.Microseconds();
+
+        rewind(_sourceFile);
+    }
+
+    printf("\nAverage run time = %d us / frame\n", 
+        static_cast<int>(avgRuntime / frameNum / NumRuns));
+    printf("Min run time = %d us / frame\n\n", 
+        static_cast<int>(minRuntime / frameNum));
+}

modules/video_processing/main/test/unit_test/denoising_test.cc

@@ -0,0 +1,118 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "unit_test.h"
+#include "video_processing.h"
+
+#include "tick_util.h"
+
+#include <cstdio>
+#include <cstdlib>
+
+using namespace webrtc;
+
+TEST_F(VideoProcessingModuleTest, Denoising)
+{
+    enum { NumRuns = 10 };
+    WebRtc_UWord32 frameNum = 0;
+
+    WebRtc_Word64 minRuntime = 0;
+    WebRtc_Word64 avgRuntime = 0;
+
+    FILE* denoiseFile = fopen("denoise_testfile.yuv", "wb");
+    ASSERT_TRUE(denoiseFile != NULL) << "Could not open output file.\n";
+
+    FILE* noiseFile = fopen("noise_testfile.yuv", "wb");
+    ASSERT_TRUE(noiseFile != NULL) << "Could not open noisy file.\n";
+
+    printf("\nRun time [us / frame]:\n");
+    for (WebRtc_UWord32 runIdx = 0; runIdx < NumRuns; runIdx++)
+    {
+        TickTime t0;
+        TickTime t1;
+        TickInterval accTicks;
+        WebRtc_Word32 modifiedPixels = 0;
+
+        frameNum = 0;
+        while (fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile) == _frameLength)
+        {
+            frameNum++;
+            WebRtc_UWord8* sourceBuffer = _videoFrame.Buffer();
+
+            // Add noise to a part in video stream
+            // Random noise
+            // TODO: investigate the effectiveness of this test.
+
+            //for(WebRtc_UWord32 ir = 0; ir < _frameLength; ir++)
+            //    sourceBuffer[ir] = 128
+            for (WebRtc_UWord32 ir = 0; ir < _height; ir++)
+            {
+                WebRtc_UWord32 ik = ir * _width;
+                for (WebRtc_UWord32 ic = 0; ic < _width; ic++)
+                {
+                    WebRtc_UWord8 r = rand() % 16;
+                    r -= 8;
+                    if (ir < _height / 4)
+                        r = 0;
+                    if (ir >= 3 * _height / 4)
+                        r = 0;
+                    if (ic < _width / 4)
+                        r = 0;
+                    if (ic >= 3 * _width / 4)
+                        r = 0;
+
+                    /*WebRtc_UWord8 pixelValue = 0;
+                    if (ir >= _height / 2)
+                    { // Region 3 or 4
+                        pixelValue = 170;
+                    }
+                    if (ic >= _width / 2)
+                    { // Region 2 or 4
+                        pixelValue += 85;
+                    }
+                    pixelValue += r;
+                    sourceBuffer[ik + ic] = pixelValue;
+                    */
+                    sourceBuffer[ik + ic] += r;
+                }
+            }
+
+            if (runIdx == 0)
+            {
+                fwrite(_videoFrame.Buffer(), 1, _frameLength, noiseFile);
+            }
+            
+            t0 = TickTime::Now();            
+            ASSERT_GE(modifiedPixels = _vpm->Denoising(_videoFrame), 0);
+            t1 = TickTime::Now();
+            accTicks += t1 - t0;
+            
+            if (runIdx == 0)
+            {
+                fwrite(_videoFrame.Buffer(), 1, _frameLength, denoiseFile);
+            }
+        }
+        ASSERT_NE(0, feof(_sourceFile)) << "Error reading source file";
+
+        printf("%u\n", static_cast<int>(accTicks.Microseconds() / frameNum));
+        if (accTicks.Microseconds() < minRuntime || runIdx == 0)
+        {
+            minRuntime = accTicks.Microseconds();
+        }
+        avgRuntime += accTicks.Microseconds();
+
+        rewind(_sourceFile);
+    }
+
+    printf("\nAverage run time = %d us / frame\n", 
+        static_cast<int>(avgRuntime / frameNum / NumRuns));
+    printf("Min run time = %d us / frame\n\n", 
+        static_cast<int>(minRuntime / frameNum));
+}

modules/video_processing/main/test/unit_test/readYUV420file.m

@@ -0,0 +1,45 @@
+function [Y,U,V] = readYUV420file(filename, width, height)
+% [Y,U,V] = readYUVfile(filename, width, height)
+
+fid = fopen(filename,'rb');
+if fid==-1
+    error(['Cannot open file ' filename]);
+end
+
+% Number of pixels per image
+nPx=width*height;
+
+% nPx bytes luminance, nPx/4 bytes U, nPx/4 bytes V
+frameSizeBytes = nPx*1.5; 
+
+% calculate number of frames
+fseek(fid,0,'eof'); % move to end of file
+fileLen=ftell(fid); % number of bytes
+fseek(fid,0,'bof'); % rewind to start
+
+% calculate number of frames
+numFrames = floor(fileLen/frameSizeBytes);
+
+Y=uint8(zeros(height,width,numFrames));
+U=uint8(zeros(height/2,width/2,numFrames));
+V=uint8(zeros(height/2,width/2,numFrames));
+
+[X,nBytes]=fread(fid, frameSizeBytes, 'uchar');
+
+for k=1:numFrames
+    
+    % Store luminance
+    Y(:,:,k)=uint8(reshape(X(1:nPx), width, height).');
+    
+    % Store U channel
+    U(:,:,k)=uint8(reshape(X(nPx + (1:nPx/4)), width/2, height/2).');
+
+    % Store V channel
+    V(:,:,k)=uint8(reshape(X(nPx + nPx/4 + (1:nPx/4)), width/2, height/2).');
+    
+    % Read next frame
+    [X,nBytes]=fread(fid, frameSizeBytes, 'uchar');
+end
+
+    
+fclose(fid);

modules/video_processing/main/test/unit_test/unit_test.cc

@@ -0,0 +1,375 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "unit_test.h"
+#include "trace.h"
+#include "tick_util.h"
+
+#ifdef WIN32
+#include <vld.h> // Visual Leak Detector
+#endif
+
+#ifdef WIN32
+#pragma message("Using Google C++ Testing Framework")
+#endif
+
+using namespace webrtc;
+
+void TestSize(VideoFrame& sourceFrame, WebRtc_UWord32 targetWidth, WebRtc_UWord32 targetHeight,
+              WebRtc_UWord32 mode, VideoProcessingModule *vpm);
+
+class VPMEnvironment : public ::testing::Environment
+{
+public:
+    virtual void SetUp()
+    {
+        Trace::CreateTrace();
+        ASSERT_EQ(0, Trace::SetTraceFile("VPMTrace.txt"));
+    }
+
+    virtual void TearDown()
+    {
+        Trace::ReturnTrace();
+    }
+};
+VideoProcessingModuleTest::VideoProcessingModuleTest() :
+    _vpm(NULL),
+    _sourceFile(NULL),
+    _width(352),
+    _height(288),
+    _frameLength(CalcBufferSize(kI420, 352, 288))
+{
+}
+
+void VideoProcessingModuleTest::SetUp()
+{
+    _vpm = VideoProcessingModule::Create(0);
+    ASSERT_TRUE(_vpm != NULL);
+
+    ASSERT_EQ(0, _videoFrame.VerifyAndAllocate(_frameLength));
+    _videoFrame.SetWidth(_width);
+    _videoFrame.SetHeight(_height);
+
+    _sourceFile  = fopen("testFiles/foreman_cif.yuv","rb");
+    ASSERT_TRUE(_sourceFile != NULL) <<
+        "Cannot read source file: testFiles/foreman_cif.yuv\n";
+}
+
+void VideoProcessingModuleTest::TearDown()
+{
+    if (_sourceFile != NULL)
+    {
+        ASSERT_EQ(0, fclose(_sourceFile));
+    }
+    _sourceFile = NULL;
+
+    if (_vpm != NULL)
+    {
+        VideoProcessingModule::Destroy(_vpm);
+    }
+    _vpm = NULL;
+}
+
+TEST_F(VideoProcessingModuleTest, GetVersionTest)
+{
+    WebRtc_Word8 version[255];
+    WebRtc_UWord32 remainingBuffer = sizeof(version);
+    WebRtc_UWord32 position = 0;
+
+    EXPECT_EQ(-1, VideoProcessingModule::GetVersion(NULL, remainingBuffer, position));
+    EXPECT_EQ(-1, _vpm->GetVersion(NULL, remainingBuffer, position));
+
+    WebRtc_UWord32 badRemainingBuffer = 5;
+    EXPECT_EQ(-3, VideoProcessingModule::GetVersion(version, badRemainingBuffer, position));
+    EXPECT_EQ(-3, _vpm->GetVersion(version, badRemainingBuffer, position));
+
+    EXPECT_EQ(0, VideoProcessingModule::GetVersion(version, remainingBuffer, position));
+    EXPECT_EQ(remainingBuffer, sizeof(version) - position);
+    printf("\n%s\n\n", version);
+
+    EXPECT_EQ(0, _vpm->GetVersion(&version[position], remainingBuffer, position));
+    EXPECT_EQ(remainingBuffer, sizeof(version) - position);
+}
+
+TEST_F(VideoProcessingModuleTest, HandleNullBuffer)
+{
+    VideoProcessingModule::FrameStats stats;
+    ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+    // Video frame with unallocated buffer.
+    VideoFrame videoFrame;
+    videoFrame.SetWidth(_width);
+    videoFrame.SetHeight(_height);
+
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, NULL, _width, _height));
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, videoFrame));
+
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(NULL, _width, _height));
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(videoFrame));
+
+    EXPECT_EQ(-1, _vpm->Deflickering(NULL, _width, _height, 0, stats));
+    EXPECT_EQ(-1, _vpm->Deflickering(videoFrame, stats));
+
+    EXPECT_EQ(-1, _vpm->Denoising(NULL, _width, _height));
+    EXPECT_EQ(-1, _vpm->Denoising(videoFrame));
+
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(NULL, _width, _height, stats));
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(videoFrame, stats));
+
+    EXPECT_EQ(VPM_PARAMETER_ERROR, _vpm->PreprocessFrame(NULL, NULL));
+
+}
+
+TEST_F(VideoProcessingModuleTest, HandleBadStats)
+{
+    VideoProcessingModule::FrameStats stats;
+    
+    ASSERT_EQ(_frameLength, fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile));
+    
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame.Buffer(), _width, _height, 0, stats));
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame, stats));
+
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame.Buffer(), _width, _height, stats));
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame, stats));
+}
+
+TEST_F(VideoProcessingModuleTest, HandleBadSize)
+{
+    VideoProcessingModule::FrameStats stats;
+    ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+
+    // Bad width
+    _videoFrame.SetWidth(0);
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, _videoFrame.Buffer(), 0, _height));
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, _videoFrame));
+    
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(_videoFrame.Buffer(), 0, _height));
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(_videoFrame));
+
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame.Buffer(), 0, _height, 0, stats));
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame, stats));
+
+    EXPECT_EQ(-1, _vpm->Denoising(_videoFrame.Buffer(), 0, _height));
+    EXPECT_EQ(-1, _vpm->Denoising(_videoFrame));
+
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame.Buffer(), 0, _height, stats));
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame, stats));
+
+
+    // Bad height
+    _videoFrame.SetWidth(_width);
+    _videoFrame.SetHeight(0);
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, _videoFrame.Buffer(), _width, 0));
+    EXPECT_EQ(-3, _vpm->GetFrameStats(stats, _videoFrame));
+   
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(_videoFrame.Buffer(), _width, 0));
+    EXPECT_EQ(-1, _vpm->ColorEnhancement(_videoFrame));
+
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame.Buffer(), _width, 0, 0, stats));
+    EXPECT_EQ(-1, _vpm->Deflickering(_videoFrame, stats));
+
+    EXPECT_EQ(-1, _vpm->Denoising(_videoFrame.Buffer(), _width, 0));
+    EXPECT_EQ(-1, _vpm->Denoising(_videoFrame));
+
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame.Buffer(), _width, 0, stats));
+    EXPECT_EQ(-3, _vpm->BrightnessDetection(_videoFrame, stats));
+
+    EXPECT_EQ(VPM_PARAMETER_ERROR, _vpm->SetTargetResolution(0,0,0));
+    EXPECT_EQ(VPM_PARAMETER_ERROR, _vpm->SetMaxFrameRate(0));
+
+    VideoFrame *outFrame = NULL;
+    EXPECT_EQ(VPM_PARAMETER_ERROR, _vpm->PreprocessFrame(&_videoFrame, &outFrame));
+
+}
+
+TEST_F(VideoProcessingModuleTest, IdenticalResultsAfterReset)
+{
+    VideoFrame videoFrame2;
+    VideoProcessingModule::FrameStats stats;
+
+    ASSERT_EQ(0, videoFrame2.VerifyAndAllocate(_frameLength));
+    videoFrame2.SetWidth(_width);
+    videoFrame2.SetHeight(_height);
+
+    // Only testing non-static functions here.
+    ASSERT_EQ(_frameLength, fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile));
+    ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+    memcpy(videoFrame2.Buffer(), _videoFrame.Buffer(), _frameLength);
+    ASSERT_EQ(0, _vpm->Deflickering(_videoFrame, stats));
+    _vpm->Reset();
+    // Retrieve frame stats again in case Deflickering() has zeroed them.
+    ASSERT_EQ(0, _vpm->GetFrameStats(stats, videoFrame2));
+    ASSERT_EQ(0, _vpm->Deflickering(videoFrame2, stats));
+    EXPECT_EQ(0, memcmp(_videoFrame.Buffer(), videoFrame2.Buffer(), _frameLength));
+
+    ASSERT_EQ(_frameLength, fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile));
+    memcpy(videoFrame2.Buffer(), _videoFrame.Buffer(), _frameLength);
+    ASSERT_GE(_vpm->Denoising(_videoFrame), 0);
+    _vpm->Reset();
+    ASSERT_GE(_vpm->Denoising(videoFrame2), 0);
+    EXPECT_EQ(0, memcmp(_videoFrame.Buffer(), videoFrame2.Buffer(), _frameLength));
+
+    ASSERT_EQ(_frameLength, fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile));
+    ASSERT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+    memcpy(videoFrame2.Buffer(), _videoFrame.Buffer(), _frameLength);
+    ASSERT_EQ(0, _vpm->BrightnessDetection(_videoFrame, stats));
+    _vpm->Reset();
+    ASSERT_EQ(0, _vpm->BrightnessDetection(videoFrame2, stats));
+    EXPECT_EQ(0, memcmp(_videoFrame.Buffer(), videoFrame2.Buffer(), _frameLength));
+
+}
+
+TEST_F(VideoProcessingModuleTest, FrameStats)
+{
+    VideoProcessingModule::FrameStats stats;
+    ASSERT_EQ(_frameLength, fread(_videoFrame.Buffer(), 1, _frameLength, _sourceFile));
+
+    EXPECT_EQ(false, _vpm->ValidFrameStats(stats));
+    EXPECT_EQ(0, _vpm->GetFrameStats(stats, _videoFrame));
+    EXPECT_EQ(true, _vpm->ValidFrameStats(stats));
+
+    printf("\nFrameStats\n");
+    printf("mean: %u\nnumPixels: %u\nsubSamplWidth: %u\nsumSamplHeight: %u\nsum: %u\n\n",
+        static_cast<unsigned int>(stats.mean),
+        static_cast<unsigned int>(stats.numPixels),
+        static_cast<unsigned int>(stats.subSamplHeight), 
+        static_cast<unsigned int>(stats.subSamplWidth),
+        static_cast<unsigned int>(stats.sum));
+
+    _vpm->ClearFrameStats(stats);
+    EXPECT_EQ(false, _vpm->ValidFrameStats(stats));
+}
+
+TEST_F(VideoProcessingModuleTest, PreprocessorLogic)
+{
+    // disable temporal sampling
+    _vpm->EnableTemporalDecimation(false);
+    ASSERT_EQ(VPM_OK, _vpm->SetMaxFrameRate(30));
+    ASSERT_EQ(VPM_OK, _vpm->SetTargetResolution(100, 100, 15));
+    //revert 
+    _vpm->EnableTemporalDecimation(true);
+    ASSERT_EQ(VPM_OK, _vpm->SetTargetResolution(100, 100, 30));
+    // disable spatial sampling
+    _vpm->SetInputFrameResampleMode(kNoRescaling);
+    ASSERT_EQ(VPM_OK, _vpm->SetTargetResolution(100, 100, 30));
+    VideoFrame *outFrame = NULL;
+    ASSERT_EQ(VPM_OK, _vpm->PreprocessFrame(&_videoFrame, &outFrame));
+    ASSERT_EQ(_videoFrame.Height() , outFrame->Height());
+    ASSERT_EQ(_videoFrame.Width() , outFrame->Width());
+
+}
+
+TEST_F(VideoProcessingModuleTest, Resampler)
+{
+    enum { NumRuns = 1 };
+    WebRtc_UWord32 frameNum = 0;
+
+    WebRtc_Word64 minRuntime = 0;
+    WebRtc_Word64 avgRuntime = 0;
+
+    TickTime t0;
+    TickTime t1;
+    TickInterval accTicks;
+    WebRtc_Word32 modifiedPixels = 0;
+    WebRtc_Word32 height = 288;
+    WebRtc_Word32 width = 352;
+    WebRtc_Word32 lengthSourceFrame = width*height*3/2;
+
+    rewind(_sourceFile);
+    ASSERT_TRUE(_sourceFile != NULL) <<
+        "Cannot read input file \n";
+
+    // CA not needed here
+    _vpm->EnableContentAnalysis(false);
+    // no temporal decimation
+    _vpm->EnableTemporalDecimation(false);
+
+    // reading test frame
+    VideoFrame sourceFrame;
+    ASSERT_EQ(0, sourceFrame.VerifyAndAllocate(lengthSourceFrame));
+    fread(sourceFrame.Buffer(), 1, lengthSourceFrame, _sourceFile);
+    ASSERT_EQ(0, sourceFrame.SetLength(lengthSourceFrame));
+    sourceFrame.SetHeight(height);
+    sourceFrame.SetWidth(width);
+
+    for (WebRtc_UWord32 runIdx = 0; runIdx < NumRuns; runIdx++)
+    {
+        // initiate test timer
+        t0 = TickTime::Now();
+
+        // kFastRescaling
+        _vpm->SetInputFrameResampleMode(kFastRescaling);
+        //TESTING DIFFERENT SIZES
+        TestSize(sourceFrame, 100, 50, 1, _vpm);          // Cut, decimation 1x, interpolate
+        TestSize(sourceFrame, 352/2, 288/2, 1, _vpm);     // Even decimation
+        TestSize(sourceFrame, 352, 288, 1, _vpm);         // No resampling
+        TestSize(sourceFrame, 2*352, 2*288,1,  _vpm);     // Even upsampling
+        TestSize(sourceFrame, 400, 256, 1, _vpm);         // Upsampling 1.5x and cut
+        TestSize(sourceFrame, 960, 720, 1, _vpm);         // Upsampling 3.5x and cut
+        TestSize(sourceFrame, 1280, 720, 1, _vpm);        // Upsampling 4x and cut
+
+        //kBiLinear
+        _vpm->SetInputFrameResampleMode(kBiLinear);
+        //TESTING DIFFERENT SIZES
+        TestSize(sourceFrame, 352/4, 288/4, 2, _vpm);
+        TestSize(sourceFrame, 352/2, 288/2, 2, _vpm);
+        TestSize(sourceFrame, 2*352, 2*288,2, _vpm);
+        TestSize(sourceFrame, 480, 640, 2, _vpm);
+        TestSize(sourceFrame, 960, 720, 2, _vpm);
+        TestSize(sourceFrame, 1280, 720, 2, _vpm);
+        // stop timer
+        t1 = TickTime::Now();
+        accTicks += t1 - t0;
+
+        if (accTicks.Microseconds() < minRuntime || runIdx == 0)
+        {
+            minRuntime = accTicks.Microseconds();
+        }
+        avgRuntime += accTicks.Microseconds();
+    }
+
+    sourceFrame.Free();
+
+     printf("\nAverage run time = %d us / frame\n",
+        //static_cast<int>(avgRuntime / frameNum / NumRuns));
+        static_cast<int>(avgRuntime));
+    printf("Min run time = %d us / frame\n\n",
+        //static_cast<int>(minRuntime / frameNum));
+        static_cast<int>(minRuntime));
+
+}
+
+void TestSize(VideoFrame& sourceFrame, WebRtc_UWord32 targetWidth, WebRtc_UWord32 targetHeight,
+              WebRtc_UWord32 mode, VideoProcessingModule *vpm)
+{
+    VideoFrame *outFrame = NULL;
+    std::ostringstream filename;
+    filename << "Resampler_"<< mode <<"_" << targetWidth << "x" << targetHeight << "_30Hz_P420.yuv";
+    std::cout << "Watch " << filename.str() << " and verify that it is okay." << std::endl;
+    FILE* standAloneFile = fopen(filename.str().c_str(), "wb");
+    ASSERT_EQ(VPM_OK, vpm->SetTargetResolution(targetWidth, targetHeight, 30));
+    ASSERT_EQ(VPM_OK, vpm->PreprocessFrame(&sourceFrame, &outFrame));
+    ASSERT_EQ((targetWidth * targetHeight * 3 / 2), outFrame->Length());
+
+    // Write to file for visual inspection
+    fwrite(outFrame->Buffer(), 1, outFrame->Length(), standAloneFile);
+
+    outFrame->Free();
+    fclose(standAloneFile);
+}
+
+int main(int argc, char** argv)
+{
+
+    ::testing::InitGoogleTest(&argc, argv);
+    VPMEnvironment* env = new VPMEnvironment;
+    ::testing::AddGlobalTestEnvironment(env);
+
+    return RUN_ALL_TESTS();
+}

modules/video_processing/main/test/unit_test/unit_test.h

@@ -0,0 +1,38 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef UNIT_TEST_H
+#define UNIT_TEST_H
+
+#include "video_processing.h"
+
+#include "vplib.h"
+
+#include <gtest/gtest.h>
+
+using namespace webrtc;
+
+class VideoProcessingModuleTest : public ::testing::Test
+{
+protected:
+    VideoProcessingModuleTest();
+    virtual void SetUp();
+    virtual void TearDown();
+    
+    VideoProcessingModule* _vpm;
+    FILE* _sourceFile;
+    VideoFrame _videoFrame;
+    const WebRtc_UWord32 _width;
+    const WebRtc_UWord32 _height;
+    const WebRtc_UWord32 _frameLength;
+};
+
+
+#endif // UNIT_TEST_H

modules/video_processing/main/test/unit_test/writeYUV420file.m

@@ -0,0 +1,22 @@
+function writeYUV420file(filename, Y, U, V)
+% writeYUV420file(filename, Y, U, V)
+
+fid = fopen(filename,'wb');
+if fid==-1
+    error(['Cannot open file ' filename]);
+end
+
+numFrames=size(Y,3);
+
+for k=1:numFrames
+   % Write luminance
+   fwrite(fid,uint8(Y(:,:,k).'), 'uchar');
+   
+   % Write U channel
+   fwrite(fid,uint8(U(:,:,k).'), 'uchar');
+   
+   % Write V channel
+   fwrite(fid,uint8(V(:,:,k).'), 'uchar');
+end
+
+fclose(fid);

modules/video_processing/main/test/vpm_tests.gyp

@@ -0,0 +1,55 @@
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'includes': [
+    '../../../../common_settings.gypi', # Common settings
+  ],
+  'targets': [
+    {
+     'target_name': 'VPMUnitTest',
+      'type': 'executable',
+      'dependencies': [
+         '../source/video_processing.gyp:video_processing',
+         '../../../utility/source/utility.gyp:webrtc_utility',
+        # The tests are based on gtest
+        '../../../../../testing/gtest.gyp:gtest',
+        '../../../../../testing/gtest.gyp:gtest_main',
+      ],
+      'include_dirs': [
+         '../../../../system_wrappers/interface',
+         '../../../../common_video/vplib/main/interface',
+      ],
+      'sources': [
+
+        # headers
+        'unit_test/unit_test.h',
+        
+        # sources
+        'unit_test/brightness_detection_test.cc',
+        'unit_test/color_enhancement_test.cc',
+        'unit_test/deflickering_test.cc',
+        'unit_test/denoising_test.cc',
+        'unit_test/unit_test.cc',  
+
+      ], # source
+      
+      'conditions': [
+      
+        ['OS=="linux"', {
+          'cflags': [
+            '-fexceptions',
+          ],
+        }],
+        
+      ], # conditions
+    },
+  ],
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2: