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

modules/video_coding/main/source/codec_timer.h

@@ -0,0 +1,61 @@
+/*
+ *  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_CODEC_TIMER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_
+
+#include "typedefs.h"
+#include "module_common_types.h"
+
+namespace webrtc
+{
+
+// MAX_HISTORY_SIZE * SHORT_FILTER_MS defines the window size in milliseconds
+#define MAX_HISTORY_SIZE 20
+#define SHORT_FILTER_MS 1000
+
+class VCMShortMaxSample
+{
+public:
+    VCMShortMaxSample() : shortMax(0), timeMs(-1) {};
+
+    WebRtc_Word32     shortMax;
+    WebRtc_Word64     timeMs;
+};
+
+class VCMCodecTimer
+{
+public:
+    VCMCodecTimer();
+
+    // Updates and returns the max filtered decode time.
+    WebRtc_Word32 StopTimer(WebRtc_Word64 startTimeMs, WebRtc_Word64 nowMs);
+
+    // Empty the list of timers.
+    void Reset();
+
+    // Get the required decode time in ms.
+    WebRtc_Word32 RequiredDecodeTimeMs(FrameType frameType) const;
+
+private:
+    void UpdateMaxHistory(WebRtc_Word32 decodeTime, WebRtc_Word64 now);
+    void MaxFilter(WebRtc_Word32 newTime, WebRtc_Word64 nowMs);
+    void ProcessHistory(WebRtc_Word64 nowMs);
+
+    WebRtc_Word32                     _filteredMax;
+    bool                              _firstDecodeTime;
+    WebRtc_Word32                     _shortMax;
+    VCMShortMaxSample                 _history[MAX_HISTORY_SIZE];
+
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_MODULES_VIDEO_CODING_CODEC_TIMER_H_