Reland of Merge webrtc/video_engine/ into webrtc/video/

webrtc/video_engine/stream_synchronization.h

-/*
- *  Copyright (c) 2012 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_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_
-#define WEBRTC_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_
-
-#include <list>
-
-#include "webrtc/system_wrappers/include/rtp_to_ntp.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-struct ViESyncDelay;
-
-class StreamSynchronization {
- public:
-  struct Measurements {
-    Measurements() : rtcp(), latest_receive_time_ms(0), latest_timestamp(0) {}
-    RtcpList rtcp;
-    int64_t latest_receive_time_ms;
-    uint32_t latest_timestamp;
-  };
-
-  StreamSynchronization(uint32_t video_primary_ssrc, int audio_channel_id);
-  ~StreamSynchronization();
-
-  bool ComputeDelays(int relative_delay_ms,
-                     int current_audio_delay_ms,
-                     int* extra_audio_delay_ms,
-                     int* total_video_delay_target_ms);
-
-  // On success |relative_delay| contains the number of milliseconds later video
-  // is rendered relative audio. If audio is played back later than video a
-  // |relative_delay| will be negative.
-  static bool ComputeRelativeDelay(const Measurements& audio_measurement,
-                                   const Measurements& video_measurement,
-                                   int* relative_delay_ms);
-  // Set target buffering delay - All audio and video will be delayed by at
-  // least target_delay_ms.
-  void SetTargetBufferingDelay(int target_delay_ms);
-
- private:
-  ViESyncDelay* channel_delay_;
-  const uint32_t video_primary_ssrc_;
-  const int audio_channel_id_;
-  int base_target_delay_ms_;
-  int avg_diff_ms_;
-};
-}  // namespace webrtc
-
-#endif  // WEBRTC_VIDEO_ENGINE_STREAM_SYNCHRONIZATION_H_