git-svn-id: http://webrtc.googlecode.com/svn/trunk@156 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/src/modules/video_coding/main/source/inter_frame_delay.h b/src/modules/video_coding/main/source/inter_frame_delay.h
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+/*
+ * 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_
