/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MOZILLA_CROSS_GRAPH_TRACK_H_
#define MOZILLA_CROSS_GRAPH_TRACK_H_
#include "AudioDriftCorrection.h"
#include "AudioSegment.h"
#include "ForwardedInputTrack.h"
#include "mozilla/SPSCQueue.h"
#include "mozilla/UniquePtr.h"
namespace mozilla {
class CrossGraphReceiver;
}
namespace mozilla::dom {
class AudioStreamTrack;
}
namespace mozilla {
/**
* CrossGraphTransmitter and CrossGraphPort are currently unused, but intended
* for connecting MediaTracks of different MediaTrackGraphs with different
* sample rates or clock sources for bug 1674892.
*
* Create with MediaTrackGraph::CreateCrossGraphTransmitter()
*/
class CrossGraphTransmitter :
public ProcessedMediaTrack {
public:
CrossGraphTransmitter(TrackRate aSampleRate,
RefPtr<CrossGraphReceiver> aReceiver);
CrossGraphTransmitter* AsCrossGraphTransmitter() override {
return this; }
uint32_t NumberOfChannels()
const override {
MOZ_CRASH(
"CrossGraphTransmitter has no segment. It cannot be played out.");
}
void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
private:
const RefPtr<CrossGraphReceiver> mReceiver;
};
/**
* Create with MediaTrackGraph::CreateCrossGraphReceiver()
*/
class CrossGraphReceiver :
public ProcessedMediaTrack {
public:
CrossGraphReceiver(TrackRate aSampleRate, TrackRate aTransmitterRate);
CrossGraphReceiver* AsCrossGraphReceiver() override {
return this; }
uint32_t NumberOfChannels()
const override;
void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
int EnqueueAudio(AudioChunk& aChunk);
private:
SPSCQueue<AudioChunk> mCrossThreadFIFO{30};
// Indicates that tre CrossGraphTransmitter has started sending frames. It
// is false untill the point, transmitter has sent the first valid frame.
// Accessed in GraphThread only.
bool mTransmitterHasStarted =
false;
// Correct the drift between transmitter and receiver. Reciever (this class)
// is considered as the master clock.
// Accessed in GraphThread only.
AudioDriftCorrection mDriftCorrection;
};
class CrossGraphPort final {
public:
static UniquePtr<CrossGraphPort> Connect(
const RefPtr<dom::AudioStreamTrack>& aStreamTrack,
MediaTrackGraph* aPartnerGraph);
~CrossGraphPort();
const RefPtr<CrossGraphTransmitter> mTransmitter;
const RefPtr<CrossGraphReceiver> mReceiver;
private:
explicit CrossGraphPort(RefPtr<MediaInputPort> aTransmitterPort,
RefPtr<CrossGraphTransmitter> aTransmitter,
RefPtr<CrossGraphReceiver> aReceiver)
: mTransmitter(std::move(aTransmitter)),
mReceiver(std::move(aReceiver)),
mTransmitterPort(std::move(aTransmitterPort)) {
MOZ_ASSERT(mTransmitter);
MOZ_ASSERT(mReceiver);
MOZ_ASSERT(mTransmitterPort);
}
// The port that connects the input track to the transmitter.
const RefPtr<MediaInputPort> mTransmitterPort;
};
}
// namespace mozilla
#endif /* MOZILLA_CROSS_GRAPH_TRACK_H_ */
