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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 MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
#define MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
#include <stdint.h>
namespace webrtc {
class VCMInterFrameDelay {
public:
explicit VCMInterFrameDelay(int64_t currentWallClock);
// Resets the estimate. Zeros are given as parameters.
void Reset(int64_t currentWallClock);
// 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(uint32_t timestamp,
int64_t* delay,
int64_t currentWallClock);
// Returns the current difference between incoming timestamps
//
// Return value : Wrap-around compensated difference between
// incoming
// timestamps.
uint32_t 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(uint32_t timestamp);
int64_t _zeroWallClock; // Local timestamp of the first video packet received
int32_t _wrapArounds; // Number of wrapArounds detected
// The previous timestamp passed to the delay estimate
uint32_t _prevTimestamp;
// The previous wall clock timestamp used by the delay estimate
int64_t _prevWallClock;
// Wrap-around compensated difference between incoming timestamps
int64_t _dTS;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
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