1/*
2 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_
12#define WEBRTC_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_
13
14#include <list>
15
16#include "webrtc/system_wrappers/interface/rtp_to_ntp.h"
17#include "webrtc/typedefs.h"
18
19namespace webrtc {
20
21struct ViESyncDelay;
22
23class StreamSynchronization {
24 public:
25  struct Measurements {
26    Measurements() : rtcp(), latest_receive_time_ms(0), latest_timestamp(0) {}
27    RtcpList rtcp;
28    int64_t latest_receive_time_ms;
29    uint32_t latest_timestamp;
30  };
31
32  StreamSynchronization(int audio_channel_id, int video_channel_id);
33  ~StreamSynchronization();
34
35  bool ComputeDelays(int relative_delay_ms,
36                     int current_audio_delay_ms,
37                     int* extra_audio_delay_ms,
38                     int* total_video_delay_target_ms);
39
40  // On success |relative_delay| contains the number of milliseconds later video
41  // is rendered relative audio. If audio is played back later than video a
42  // |relative_delay| will be negative.
43  static bool ComputeRelativeDelay(const Measurements& audio_measurement,
44                                   const Measurements& video_measurement,
45                                   int* relative_delay_ms);
46  // Set target buffering delay - All audio and video will be delayed by at
47  // least target_delay_ms.
48  void SetTargetBufferingDelay(int target_delay_ms);
49
50 private:
51  ViESyncDelay* channel_delay_;
52  int audio_channel_id_;
53  int video_channel_id_;
54  int base_target_delay_ms_;
55  int avg_diff_ms_;
56};
57}  // namespace webrtc
58
59#endif  // WEBRTC_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_
60