зеркало из https://github.com/mozilla/gecko-dev.git
136 строки
4.6 KiB
C++
136 строки
4.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MediaTrackGraphImpl.h"
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#include "MediaTrackListener.h"
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#include "mozilla/MathAlgorithms.h"
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#include "mozilla/Unused.h"
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#include "AudioSegment.h"
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#include "mozilla/Logging.h"
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#include "mozilla/Attributes.h"
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#include "AudioCaptureTrack.h"
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#include "ImageContainer.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeTrack.h"
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#include "AudioNodeExternalInputTrack.h"
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#include "webaudio/MediaStreamAudioDestinationNode.h"
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#include <algorithm>
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#include "DOMMediaStream.h"
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using namespace mozilla::layers;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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namespace mozilla {
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// We are mixing to mono until PeerConnection can accept stereo
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static const uint32_t MONO = 1;
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AudioCaptureTrack::AudioCaptureTrack(TrackRate aRate)
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: ProcessedMediaTrack(aRate, MediaSegment::AUDIO, new AudioSegment()),
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mStarted(false) {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_COUNT_CTOR(AudioCaptureTrack);
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mMixer.AddCallback(WrapNotNull(this));
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}
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AudioCaptureTrack::~AudioCaptureTrack() {
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MOZ_COUNT_DTOR(AudioCaptureTrack);
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mMixer.RemoveCallback(this);
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}
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void AudioCaptureTrack::Start() {
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class Message : public ControlMessage {
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public:
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explicit Message(AudioCaptureTrack* aTrack)
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: ControlMessage(aTrack), mTrack(aTrack) {}
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virtual void Run() { mTrack->mStarted = true; }
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protected:
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AudioCaptureTrack* mTrack;
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};
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GraphImpl()->AppendMessage(MakeUnique<Message>(this));
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}
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void AudioCaptureTrack::ProcessInput(GraphTime aFrom, GraphTime aTo,
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uint32_t aFlags) {
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if (!mStarted) {
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return;
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}
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uint32_t inputCount = mInputs.Length();
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if (mEnded) {
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return;
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}
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// If the captured track is connected back to a object on the page (be it an
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// HTMLMediaElement with a track as source, or an AudioContext), a cycle
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// situation occur. This can work if it's an AudioContext with at least one
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// DelayNode, but the MTG will mute the whole cycle otherwise.
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if (InMutedCycle() || inputCount == 0) {
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GetData<AudioSegment>()->AppendNullData(aTo - aFrom);
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} else {
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// We mix down all the tracks of all inputs, to a stereo track. Everything
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// is {up,down}-mixed to stereo.
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mMixer.StartMixing();
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AudioSegment output;
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for (uint32_t i = 0; i < inputCount; i++) {
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MediaTrack* s = mInputs[i]->GetSource();
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AudioSegment* inputSegment = s->GetData<AudioSegment>();
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TrackTime inputStart = s->GraphTimeToTrackTimeWithBlocking(aFrom);
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TrackTime inputEnd = s->GraphTimeToTrackTimeWithBlocking(aTo);
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AudioSegment toMix;
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if (s->Ended() && inputSegment->GetDuration() <= inputStart) {
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toMix.AppendNullData(aTo - aFrom);
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} else {
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toMix.AppendSlice(*inputSegment, inputStart, inputEnd);
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// Care for tracks blocked in the [aTo, aFrom] range.
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if (inputEnd - inputStart < aTo - aFrom) {
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toMix.AppendNullData((aTo - aFrom) - (inputEnd - inputStart));
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}
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}
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toMix.Mix(mMixer, MONO, Graph()->GraphRate());
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}
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// This calls MixerCallback below
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mMixer.FinishMixing();
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}
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}
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void AudioCaptureTrack::MixerCallback(AudioDataValue* aMixedBuffer,
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AudioSampleFormat aFormat,
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uint32_t aChannels, uint32_t aFrames,
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uint32_t aSampleRate) {
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AutoTArray<nsTArray<AudioDataValue>, MONO> output;
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AutoTArray<const AudioDataValue*, MONO> bufferPtrs;
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output.SetLength(MONO);
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bufferPtrs.SetLength(MONO);
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uint32_t written = 0;
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// We need to copy here, because the mixer will reuse the storage, we should
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// not hold onto it. Buffers are in planar format.
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for (uint32_t channel = 0; channel < aChannels; channel++) {
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AudioDataValue* out = output[channel].AppendElements(aFrames);
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PodCopy(out, aMixedBuffer + written, aFrames);
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bufferPtrs[channel] = out;
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written += aFrames;
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}
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AudioChunk chunk;
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chunk.mBuffer =
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new mozilla::SharedChannelArrayBuffer<AudioDataValue>(&output);
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chunk.mDuration = aFrames;
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chunk.mBufferFormat = aFormat;
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chunk.mChannelData.SetLength(MONO);
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for (uint32_t channel = 0; channel < aChannels; channel++) {
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chunk.mChannelData[channel] = bufferPtrs[channel];
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}
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// Now we have mixed data, simply append it.
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GetData<AudioSegment>()->AppendAndConsumeChunk(&chunk);
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}
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} // namespace mozilla
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