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/*
* 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_
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