61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
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#define MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
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#include <stdint.h>
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namespace webrtc {
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class VCMInterFrameDelay {
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public:
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explicit VCMInterFrameDelay(int64_t currentWallClock);
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// Resets the estimate. Zeros are given as parameters.
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void Reset(int64_t currentWallClock);
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// Calculates the delay of a frame with the given timestamp.
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// This method is called when the frame is complete.
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//
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// Input:
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// - timestamp : RTP timestamp of a received frame.
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// - *delay : Pointer to memory where the result should be
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// stored.
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// - currentWallClock : The current time in milliseconds.
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// Should be -1 for normal operation, only used
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// for testing.
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// Return value : true if OK, false when reordered timestamps.
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bool CalculateDelay(uint32_t timestamp,
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int64_t* delay,
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int64_t currentWallClock);
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private:
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// Controls if the RTP timestamp counter has had a wrap around between the
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// current and the previously received frame.
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//
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// Input:
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// - timestamp : RTP timestamp of the current frame.
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void CheckForWrapArounds(uint32_t timestamp);
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int64_t _zeroWallClock; // Local timestamp of the first video packet received
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int32_t _wrapArounds; // Number of wrapArounds detected
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// The previous timestamp passed to the delay estimate
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uint32_t _prevTimestamp;
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// The previous wall clock timestamp used by the delay estimate
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int64_t _prevWallClock;
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// Wrap-around compensated difference between incoming timestamps
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int64_t _dTS;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_
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