97 lines
3.3 KiB
C++
97 lines
3.3 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 "MediaTrackGraph.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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}
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AudioCaptureTrack::~AudioCaptureTrack() { MOZ_COUNT_DTOR(AudioCaptureTrack); }
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void AudioCaptureTrack::Start() {
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QueueControlMessageWithNoShutdown(
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[self = RefPtr{this}, this] { mStarted = true; });
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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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AudioChunk* mixed = mMixer.MixedChunk();
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MOZ_ASSERT(mixed->ChannelCount() == MONO);
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// Now we have mixed data, simply append it.
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GetData<AudioSegment>()->AppendAndConsumeChunk(std::move(*mixed));
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}
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}
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uint32_t AudioCaptureTrack::NumberOfChannels() const {
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return GetData<AudioSegment>()->MaxChannelCount();
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}
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} // namespace mozilla
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