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493 lines
18 KiB
C++
493 lines
18 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 "MediaStreamGraphImpl.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeExternalInputStream.h"
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#include "speex/speex_resampler.h"
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using namespace mozilla::dom;
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namespace mozilla {
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AudioNodeExternalInputStream::AudioNodeExternalInputStream(AudioNodeEngine* aEngine, TrackRate aSampleRate)
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: AudioNodeStream(aEngine, MediaStreamGraph::INTERNAL_STREAM, aSampleRate)
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, mCurrentOutputPosition(0)
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{
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MOZ_COUNT_CTOR(AudioNodeExternalInputStream);
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}
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AudioNodeExternalInputStream::~AudioNodeExternalInputStream()
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{
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MOZ_COUNT_DTOR(AudioNodeExternalInputStream);
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}
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AudioNodeExternalInputStream::TrackMapEntry::~TrackMapEntry()
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{
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if (mResampler) {
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speex_resampler_destroy(mResampler);
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}
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}
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uint32_t
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AudioNodeExternalInputStream::GetTrackMapEntry(const StreamBuffer::Track& aTrack,
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GraphTime aFrom)
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{
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AudioSegment* segment = aTrack.Get<AudioSegment>();
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// Check the map for an existing entry corresponding to the input track.
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for (uint32_t i = 0; i < mTrackMap.Length(); ++i) {
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TrackMapEntry* map = &mTrackMap[i];
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if (map->mTrackID == aTrack.GetID()) {
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return i;
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}
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}
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// Determine channel count by finding the first entry with non-silent data.
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AudioSegment::ChunkIterator ci(*segment);
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while (!ci.IsEnded() && ci->IsNull()) {
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ci.Next();
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}
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if (ci.IsEnded()) {
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// The track is entirely silence so far, we can ignore it for now.
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return nsTArray<TrackMapEntry>::NoIndex;
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}
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// Create a speex resampler with the same sample rate and number of channels
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// as the track.
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SpeexResamplerState* resampler = nullptr;
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uint32_t channelCount = (*ci).mChannelData.Length();
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if (aTrack.GetRate() != mSampleRate) {
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resampler = speex_resampler_init(channelCount,
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aTrack.GetRate(), mSampleRate, SPEEX_RESAMPLER_QUALITY_DEFAULT, nullptr);
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speex_resampler_skip_zeros(resampler);
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}
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TrackMapEntry* map = mTrackMap.AppendElement();
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map->mEndOfConsumedInputTicks = 0;
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map->mEndOfLastInputIntervalInInputStream = -1;
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map->mEndOfLastInputIntervalInOutputStream = -1;
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map->mSamplesPassedToResampler =
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TimeToTicksRoundUp(aTrack.GetRate(), GraphTimeToStreamTime(aFrom));
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map->mResampler = resampler;
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map->mResamplerChannelCount = channelCount;
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map->mTrackID = aTrack.GetID();
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return mTrackMap.Length() - 1;
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}
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static const uint32_t SPEEX_RESAMPLER_PROCESS_MAX_OUTPUT = 1000;
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template <typename T> static int
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SpeexResamplerProcess(SpeexResamplerState* aResampler,
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uint32_t aChannel,
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const T* aInput, uint32_t* aIn,
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float* aOutput, uint32_t* aOut);
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template <> int
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SpeexResamplerProcess<float>(SpeexResamplerState* aResampler,
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uint32_t aChannel,
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const float* aInput, uint32_t* aIn,
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float* aOutput, uint32_t* aOut)
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{
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NS_ASSERTION(*aOut <= SPEEX_RESAMPLER_PROCESS_MAX_OUTPUT, "Bad aOut");
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return speex_resampler_process_float(aResampler, aChannel, aInput, aIn, aOutput, aOut);
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}
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template <> int
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SpeexResamplerProcess<int16_t>(SpeexResamplerState* aResampler,
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uint32_t aChannel,
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const int16_t* aInput, uint32_t* aIn,
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float* aOutput, uint32_t* aOut)
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{
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NS_ASSERTION(*aOut <= SPEEX_RESAMPLER_PROCESS_MAX_OUTPUT, "Bad aOut");
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int16_t tmp[SPEEX_RESAMPLER_PROCESS_MAX_OUTPUT];
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int result = speex_resampler_process_int(aResampler, aChannel, aInput, aIn, tmp, aOut);
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if (result == RESAMPLER_ERR_SUCCESS) {
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for (uint32_t i = 0; i < *aOut; ++i) {
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aOutput[i] = AudioSampleToFloat(tmp[i]);
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}
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}
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return result;
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}
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template <typename T> static void
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ResampleChannelBuffer(SpeexResamplerState* aResampler, uint32_t aChannel,
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const T* aInput, uint32_t aInputDuration,
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nsTArray<float>* aOutput)
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{
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if (!aResampler) {
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float* out = aOutput->AppendElements(aInputDuration);
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for (uint32_t i = 0; i < aInputDuration; ++i) {
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out[i] = AudioSampleToFloat(aInput[i]);
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}
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return;
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}
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uint32_t processed = 0;
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while (processed < aInputDuration) {
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uint32_t prevLength = aOutput->Length();
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float* output = aOutput->AppendElements(SPEEX_RESAMPLER_PROCESS_MAX_OUTPUT);
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uint32_t in = aInputDuration - processed;
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uint32_t out = aOutput->Length() - prevLength;
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SpeexResamplerProcess(aResampler, aChannel,
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aInput + processed, &in,
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output, &out);
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processed += in;
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aOutput->SetLength(prevLength + out);
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}
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}
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class SharedChannelArrayBuffer : public ThreadSharedObject {
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public:
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SharedChannelArrayBuffer(nsTArray<nsTArray<float> >* aBuffers)
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{
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mBuffers.SwapElements(*aBuffers);
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}
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nsTArray<nsTArray<float> > mBuffers;
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};
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void
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AudioNodeExternalInputStream::TrackMapEntry::ResampleChannels(const nsTArray<const void*>& aBuffers,
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uint32_t aInputDuration,
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AudioSampleFormat aFormat,
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float aVolume)
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{
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NS_ASSERTION(aBuffers.Length() == mResamplerChannelCount,
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"Channel count must be correct here");
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nsAutoTArray<nsTArray<float>,2> resampledBuffers;
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resampledBuffers.SetLength(aBuffers.Length());
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nsTArray<float> samplesAdjustedForVolume;
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nsAutoTArray<const float*,2> bufferPtrs;
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bufferPtrs.SetLength(aBuffers.Length());
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for (uint32_t i = 0; i < aBuffers.Length(); ++i) {
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AudioSampleFormat format = aFormat;
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const void* buffer = aBuffers[i];
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if (aVolume != 1.0f) {
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format = AUDIO_FORMAT_FLOAT32;
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samplesAdjustedForVolume.SetLength(aInputDuration);
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switch (aFormat) {
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case AUDIO_FORMAT_FLOAT32:
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ConvertAudioSamplesWithScale(static_cast<const float*>(buffer),
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samplesAdjustedForVolume.Elements(),
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aInputDuration, aVolume);
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break;
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case AUDIO_FORMAT_S16:
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ConvertAudioSamplesWithScale(static_cast<const int16_t*>(buffer),
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samplesAdjustedForVolume.Elements(),
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aInputDuration, aVolume);
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break;
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default:
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MOZ_ASSERT(false);
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return;
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}
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buffer = samplesAdjustedForVolume.Elements();
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}
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switch (format) {
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case AUDIO_FORMAT_FLOAT32:
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ResampleChannelBuffer(mResampler, i,
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static_cast<const float*>(buffer),
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aInputDuration, &resampledBuffers[i]);
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break;
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case AUDIO_FORMAT_S16:
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ResampleChannelBuffer(mResampler, i,
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static_cast<const int16_t*>(buffer),
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aInputDuration, &resampledBuffers[i]);
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break;
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default:
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MOZ_ASSERT(false);
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return;
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}
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bufferPtrs[i] = resampledBuffers[i].Elements();
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NS_ASSERTION(i == 0 ||
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resampledBuffers[i].Length() == resampledBuffers[0].Length(),
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"Resampler made different decisions for different channels!");
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}
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uint32_t length = resampledBuffers[0].Length();
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nsRefPtr<ThreadSharedObject> buf = new SharedChannelArrayBuffer(&resampledBuffers);
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mResampledData.AppendFrames(buf.forget(), bufferPtrs, length);
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}
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void
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AudioNodeExternalInputStream::TrackMapEntry::ResampleInputData(AudioSegment* aSegment)
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{
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AudioSegment::ChunkIterator ci(*aSegment);
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while (!ci.IsEnded()) {
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const AudioChunk& chunk = *ci;
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nsAutoTArray<const void*,2> channels;
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if (chunk.GetDuration() > UINT32_MAX) {
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// This will cause us to OOM or overflow below. So let's just bail.
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NS_ERROR("Chunk duration out of bounds");
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return;
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}
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uint32_t duration = uint32_t(chunk.GetDuration());
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if (chunk.IsNull()) {
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nsAutoTArray<AudioDataValue,1024> silence;
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silence.SetLength(duration);
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PodZero(silence.Elements(), silence.Length());
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channels.SetLength(mResamplerChannelCount);
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for (uint32_t i = 0; i < channels.Length(); ++i) {
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channels[i] = silence.Elements();
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}
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ResampleChannels(channels, duration, AUDIO_OUTPUT_FORMAT, 0.0f);
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} else if (chunk.mChannelData.Length() == mResamplerChannelCount) {
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// Common case, since mResamplerChannelCount is set to the first chunk's
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// number of channels.
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channels.AppendElements(chunk.mChannelData);
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ResampleChannels(channels, duration, chunk.mBufferFormat, chunk.mVolume);
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} else {
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// Uncommon case. Since downmixing requires channels to be floats,
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// convert everything to floats now.
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uint32_t upChannels = GetAudioChannelsSuperset(chunk.mChannelData.Length(), mResamplerChannelCount);
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nsTArray<float> buffer;
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if (chunk.mBufferFormat == AUDIO_FORMAT_FLOAT32) {
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channels.AppendElements(chunk.mChannelData);
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} else {
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NS_ASSERTION(chunk.mBufferFormat == AUDIO_FORMAT_S16, "Unknown format");
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if (duration > UINT32_MAX/chunk.mChannelData.Length()) {
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NS_ERROR("Chunk duration out of bounds");
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return;
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}
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buffer.SetLength(chunk.mChannelData.Length()*duration);
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for (uint32_t i = 0; i < chunk.mChannelData.Length(); ++i) {
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const int16_t* samples = static_cast<const int16_t*>(chunk.mChannelData[i]);
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float* converted = &buffer[i*duration];
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for (uint32_t j = 0; j < duration; ++j) {
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converted[j] = AudioSampleToFloat(samples[j]);
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}
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channels.AppendElement(converted);
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}
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}
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nsTArray<float> zeroes;
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if (channels.Length() < upChannels) {
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zeroes.SetLength(duration);
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PodZero(zeroes.Elements(), zeroes.Length());
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AudioChannelsUpMix(&channels, upChannels, zeroes.Elements());
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}
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if (channels.Length() == mResamplerChannelCount) {
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ResampleChannels(channels, duration, AUDIO_FORMAT_FLOAT32, chunk.mVolume);
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} else {
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nsTArray<float> output;
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if (duration > UINT32_MAX/mResamplerChannelCount) {
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NS_ERROR("Chunk duration out of bounds");
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return;
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}
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output.SetLength(duration*mResamplerChannelCount);
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nsAutoTArray<float*,2> outputPtrs;
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nsAutoTArray<const void*,2> outputPtrsConst;
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for (uint32_t i = 0; i < mResamplerChannelCount; ++i) {
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outputPtrs.AppendElement(output.Elements() + i*duration);
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outputPtrsConst.AppendElement(outputPtrs[i]);
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}
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AudioChannelsDownMix(channels, outputPtrs.Elements(), outputPtrs.Length(), duration);
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ResampleChannels(outputPtrsConst, duration, AUDIO_FORMAT_FLOAT32, chunk.mVolume);
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}
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}
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ci.Next();
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}
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}
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/**
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* Copies the data in aInput to aOffsetInBlock within aBlock. All samples must
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* be float. Both chunks must have the same number of channels (or else
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* aInput is null). aBlock must have been allocated with AllocateInputBlock.
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*/
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static void
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CopyChunkToBlock(const AudioChunk& aInput, AudioChunk *aBlock, uint32_t aOffsetInBlock)
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{
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uint32_t d = aInput.GetDuration();
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for (uint32_t i = 0; i < aBlock->mChannelData.Length(); ++i) {
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float* out = static_cast<float*>(const_cast<void*>(aBlock->mChannelData[i])) +
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aOffsetInBlock;
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if (aInput.IsNull()) {
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PodZero(out, d);
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} else {
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const float* in = static_cast<const float*>(aInput.mChannelData[i]);
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ConvertAudioSamplesWithScale(in, out, d, aInput.mVolume);
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}
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}
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}
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/**
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* Converts the data in aSegment to a single chunk aChunk. Every chunk in
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* aSegment must have the same number of channels (or be null). aSegment must have
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* duration WEBAUDIO_BLOCK_SIZE. Every chunk in aSegment must be in float format.
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*/
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static void
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ConvertSegmentToAudioBlock(AudioSegment* aSegment, AudioChunk* aBlock)
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{
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NS_ASSERTION(aSegment->GetDuration() == WEBAUDIO_BLOCK_SIZE, "Bad segment duration");
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{
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AudioSegment::ChunkIterator ci(*aSegment);
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NS_ASSERTION(!ci.IsEnded(), "Segment must have at least one chunk");
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AudioChunk& firstChunk = *ci;
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ci.Next();
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if (ci.IsEnded()) {
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*aBlock = firstChunk;
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return;
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}
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while (ci->IsNull() && !ci.IsEnded()) {
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ci.Next();
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}
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if (ci.IsEnded()) {
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// All null.
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aBlock->SetNull(WEBAUDIO_BLOCK_SIZE);
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return;
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}
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AllocateAudioBlock(ci->mChannelData.Length(), aBlock);
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}
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AudioSegment::ChunkIterator ci(*aSegment);
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uint32_t duration = 0;
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while (!ci.IsEnded()) {
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CopyChunkToBlock(*ci, aBlock, duration);
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duration += ci->GetDuration();
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ci.Next();
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}
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}
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void
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AudioNodeExternalInputStream::ProduceOutput(GraphTime aFrom, GraphTime aTo)
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{
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// According to spec, number of outputs is always 1.
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mLastChunks.SetLength(1);
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// GC stuff can result in our input stream being destroyed before this stream.
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// Handle that.
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if (mInputs.IsEmpty()) {
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mLastChunks[0].SetNull(WEBAUDIO_BLOCK_SIZE);
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AdvanceOutputSegment();
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return;
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}
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MOZ_ASSERT(mInputs.Length() == 1);
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MediaStream* source = mInputs[0]->GetSource();
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nsAutoTArray<AudioSegment,1> audioSegments;
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nsAutoTArray<bool,1> trackMapEntriesUsed;
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uint32_t inputChannels = 0;
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for (StreamBuffer::TrackIter tracks(source->mBuffer, MediaSegment::AUDIO);
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!tracks.IsEnded(); tracks.Next()) {
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const StreamBuffer::Track& inputTrack = *tracks;
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// Create a TrackMapEntry if necessary.
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uint32_t trackMapIndex = GetTrackMapEntry(inputTrack, aFrom);
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// Maybe there's nothing in this track yet. If so, ignore it. (While the
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// track is only playing silence, we may not be able to determine the
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// correct number of channels to start resampling.)
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if (trackMapIndex == nsTArray<TrackMapEntry>::NoIndex) {
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continue;
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}
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while (trackMapEntriesUsed.Length() <= trackMapIndex) {
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trackMapEntriesUsed.AppendElement(false);
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}
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trackMapEntriesUsed[trackMapIndex] = true;
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TrackMapEntry* trackMap = &mTrackMap[trackMapIndex];
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AudioSegment segment;
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GraphTime next;
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TrackRate inputTrackRate = inputTrack.GetRate();
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for (GraphTime t = aFrom; t < aTo; t = next) {
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MediaInputPort::InputInterval interval = mInputs[0]->GetNextInputInterval(t);
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interval.mEnd = std::min(interval.mEnd, aTo);
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if (interval.mStart >= interval.mEnd)
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break;
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next = interval.mEnd;
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// Ticks >= startTicks and < endTicks are in the interval
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StreamTime outputEnd = GraphTimeToStreamTime(interval.mEnd);
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TrackTicks startTicks = trackMap->mSamplesPassedToResampler + segment.GetDuration();
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StreamTime outputStart = GraphTimeToStreamTime(interval.mStart);
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NS_ASSERTION(startTicks == TimeToTicksRoundUp(inputTrackRate, outputStart),
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"Samples missing");
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TrackTicks endTicks = TimeToTicksRoundUp(inputTrackRate, outputEnd);
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TrackTicks ticks = endTicks - startTicks;
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if (interval.mInputIsBlocked) {
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segment.AppendNullData(ticks);
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} else {
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// See comments in TrackUnionStream::CopyTrackData
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StreamTime inputStart = source->GraphTimeToStreamTime(interval.mStart);
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StreamTime inputEnd = source->GraphTimeToStreamTime(interval.mEnd);
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TrackTicks inputTrackEndPoint =
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inputTrack.IsEnded() ? inputTrack.GetEnd() : TRACK_TICKS_MAX;
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if (trackMap->mEndOfLastInputIntervalInInputStream != inputStart ||
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trackMap->mEndOfLastInputIntervalInOutputStream != outputStart) {
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// Start of a new series of intervals where neither stream is blocked.
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trackMap->mEndOfConsumedInputTicks = TimeToTicksRoundDown(inputTrackRate, inputStart) - 1;
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}
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TrackTicks inputStartTicks = trackMap->mEndOfConsumedInputTicks;
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TrackTicks inputEndTicks = inputStartTicks + ticks;
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trackMap->mEndOfConsumedInputTicks = inputEndTicks;
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trackMap->mEndOfLastInputIntervalInInputStream = inputEnd;
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trackMap->mEndOfLastInputIntervalInOutputStream = outputEnd;
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if (inputStartTicks < 0) {
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// Data before the start of the track is just null.
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segment.AppendNullData(-inputStartTicks);
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inputStartTicks = 0;
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}
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if (inputEndTicks > inputStartTicks) {
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segment.AppendSlice(*inputTrack.GetSegment(),
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std::min(inputTrackEndPoint, inputStartTicks),
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std::min(inputTrackEndPoint, inputEndTicks));
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}
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// Pad if we're looking past the end of the track
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segment.AppendNullData(std::max<TrackTicks>(0, inputEndTicks - inputTrackEndPoint));
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}
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}
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trackMap->mSamplesPassedToResampler += segment.GetDuration();
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trackMap->ResampleInputData(&segment);
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if (trackMap->mResampledData.GetDuration() < mCurrentOutputPosition + WEBAUDIO_BLOCK_SIZE) {
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// We don't have enough data. Delay it.
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trackMap->mResampledData.InsertNullDataAtStart(
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mCurrentOutputPosition + WEBAUDIO_BLOCK_SIZE - trackMap->mResampledData.GetDuration());
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}
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audioSegments.AppendElement()->AppendSlice(trackMap->mResampledData,
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mCurrentOutputPosition, mCurrentOutputPosition + WEBAUDIO_BLOCK_SIZE);
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trackMap->mResampledData.ForgetUpTo(mCurrentOutputPosition + WEBAUDIO_BLOCK_SIZE);
|
|
inputChannels = GetAudioChannelsSuperset(inputChannels, trackMap->mResamplerChannelCount);
|
|
}
|
|
|
|
for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
|
|
if (i >= int32_t(trackMapEntriesUsed.Length()) || !trackMapEntriesUsed[i]) {
|
|
mTrackMap.RemoveElementAt(i);
|
|
}
|
|
}
|
|
|
|
uint32_t outputChannels = ComputeFinalOuputChannelCount(inputChannels);
|
|
|
|
if (outputChannels) {
|
|
AllocateAudioBlock(outputChannels, &mLastChunks[0]);
|
|
nsAutoTArray<float,GUESS_AUDIO_CHANNELS*WEBAUDIO_BLOCK_SIZE> downmixBuffer;
|
|
for (uint32_t i = 0; i < audioSegments.Length(); ++i) {
|
|
AudioChunk tmpChunk;
|
|
ConvertSegmentToAudioBlock(&audioSegments[i], &tmpChunk);
|
|
if (!tmpChunk.IsNull()) {
|
|
AccumulateInputChunk(i, tmpChunk, &mLastChunks[0], &downmixBuffer);
|
|
}
|
|
}
|
|
} else {
|
|
mLastChunks[0].SetNull(WEBAUDIO_BLOCK_SIZE);
|
|
}
|
|
mCurrentOutputPosition += WEBAUDIO_BLOCK_SIZE;
|
|
|
|
// Using AudioNodeStream's AdvanceOutputSegment to push the media stream graph along with null data.
|
|
AdvanceOutputSegment();
|
|
}
|
|
|
|
}
|