| /* |
| * 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 "webrtc/typedefs.h" |
| |
| namespace webrtc |
| { |
| |
| class VCMInterFrameDelay |
| { |
| public: |
| 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 // WEBRTC_MODULES_VIDEO_CODING_INTER_FRAME_DELAY_H_ |