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

2011-05-30 11:22:19 +00:00
parent 01813fe945
commit 77ae29bc81
1153 changed files with 404089 additions and 0 deletions
--- a/modules/video_coding/main/source/inter_frame_delay.h
+++ b/modules/video_coding/main/source/inter_frame_delay.h
@@ -0,0 +1,66 @@
+/*
+ *  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 WEBRTC_MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
+#define WEBRTC_MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
+
+#include "typedefs.h"
+
+namespace webrtc
+{
+
+class VCMInterFrameDelay
+{
+public:
+    VCMInterFrameDelay();
+
+    // Resets the estimate. Zeros are given as parameters.
+    void Reset();
+
+    // Calculates the delay of a frame with the given timestamp.
+    // This method is called when the frame is complete.
+    //
+    // Input:
+    //          - timestamp         : RTP timestamp of a received frame
+    //          - *delay            : Pointer to memory where the result should be stored
+    //          - currentWallClock  : The current time in milliseconds.
+    //                                Should be -1 for normal operation, only used for testing.
+    // Return value                 : true if OK, false when reordered timestamps
+    bool CalculateDelay(WebRtc_UWord32 timestamp,
+                        WebRtc_Word64 *delay,
+                        WebRtc_Word64 currentWallClock = -1);
+
+    // Returns the current difference between incoming timestamps
+    //
+    // Return value                 : Wrap-around compensated difference between incoming
+    //                                timestamps.
+    WebRtc_UWord32 CurrentTimeStampDiffMs() const;
+
+private:
+    // Controls if the RTP timestamp counter has had a wrap around
+    // between the current and the previously received frame.
+    //
+    // Input:
+    //          - timestmap         : RTP timestamp of the current frame.
+    void CheckForWrapArounds(WebRtc_UWord32 timestamp);
+
+    WebRtc_Word64         _zeroWallClock; // Local timestamp of the first video packet received
+    WebRtc_Word32         _wrapArounds;   // Number of wrapArounds detected
+    // The previous timestamp passed to the delay estimate
+    WebRtc_UWord32        _prevTimestamp;
+    // The previous wall clock timestamp used by the delay estimate
+    WebRtc_Word64         _prevWallClock;
+    // Wrap-around compensated difference between incoming timestamps
+    WebRtc_Word64         _dTS;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_