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/* -*- 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/. */
#include "AudioChunkList.h"
namespace mozilla {
AudioChunkList::AudioChunkList(uint32_t aTotalDuration, uint32_t aChannels,
const PrincipalHandle& aPrincipalHandle)
: mPrincipalHandle(aPrincipalHandle) {
uint32_t numOfChunks = aTotalDuration / mChunkCapacity;
if (aTotalDuration % mChunkCapacity) {
++numOfChunks;
}
CreateChunks(numOfChunks, aChannels);
}
void AudioChunkList::CreateChunks(uint32_t aNumOfChunks, uint32_t aChannels) {
MOZ_ASSERT(!mChunks.Length());
MOZ_ASSERT(aNumOfChunks);
MOZ_ASSERT(aChannels);
mChunks.AppendElements(aNumOfChunks);
for (AudioChunk& chunk : mChunks) {
AutoTArray<nsTArray<float>, 2> buffer;
buffer.AppendElements(aChannels);
AutoTArray<const float*, 2> bufferPtrs;
bufferPtrs.AppendElements(aChannels);
for (uint32_t i = 0; i < aChannels; ++i) {
float* ptr = buffer[i].AppendElements(mChunkCapacity);
bufferPtrs[i] = ptr;
}
chunk.mBuffer = new mozilla::SharedChannelArrayBuffer(std::move(buffer));
chunk.mChannelData.AppendElements(aChannels);
for (uint32_t i = 0; i < aChannels; ++i) {
chunk.mChannelData[i] = bufferPtrs[i];
}
}
}
void AudioChunkList::UpdateToMonoOrStereo(uint32_t aChannels) {
MOZ_ASSERT(mChunks.Length());
MOZ_ASSERT(mSampleFormat == AUDIO_FORMAT_S16 ||
mSampleFormat == AUDIO_FORMAT_FLOAT32);
MOZ_ASSERT(aChannels == 1 || aChannels == 2);
for (AudioChunk& chunk : mChunks) {
MOZ_ASSERT(chunk.ChannelCount() != (uint32_t)aChannels);
MOZ_ASSERT(chunk.ChannelCount() == 1 || chunk.ChannelCount() == 2);
chunk.mChannelData.SetLengthAndRetainStorage(aChannels);
if (mSampleFormat == AUDIO_FORMAT_S16) {
SharedChannelArrayBuffer<short>* channelArray =
static_cast<SharedChannelArrayBuffer<short>*>(chunk.mBuffer.get());
channelArray->mBuffers.SetLengthAndRetainStorage(aChannels);
if (aChannels == 2) {
// This an indirect allocation, unfortunately.
channelArray->mBuffers[1].SetLength(mChunkCapacity);
chunk.mChannelData[1] = channelArray->mBuffers[1].Elements();
}
} else {
SharedChannelArrayBuffer<float>* channelArray =
static_cast<SharedChannelArrayBuffer<float>*>(chunk.mBuffer.get());
channelArray->mBuffers.SetLengthAndRetainStorage(aChannels);
if (aChannels == 2) {
// This an indirect allocation, unfortunately.
channelArray->mBuffers[1].SetLength(mChunkCapacity);
chunk.mChannelData[1] = channelArray->mBuffers[1].Elements();
}
}
}
}
void AudioChunkList::SetSampleFormat(AudioSampleFormat aFormat) {
MOZ_ASSERT(mSampleFormat == AUDIO_FORMAT_SILENCE);
MOZ_ASSERT(aFormat == AUDIO_FORMAT_S16 || aFormat == AUDIO_FORMAT_FLOAT32);
mSampleFormat = aFormat;
if (mSampleFormat == AUDIO_FORMAT_S16) {
mChunkCapacity = 2 * mChunkCapacity;
}
}
AudioChunk& AudioChunkList::GetNext() {
AudioChunk& chunk = mChunks[mIndex];
MOZ_ASSERT(!chunk.mChannelData.IsEmpty());
MOZ_ASSERT(chunk.mBuffer);
MOZ_ASSERT(!chunk.mBuffer->IsShared());
MOZ_ASSERT(mSampleFormat == AUDIO_FORMAT_S16 ||
mSampleFormat == AUDIO_FORMAT_FLOAT32);
chunk.mDuration = 0;
chunk.mVolume = 1.0f;
chunk.mPrincipalHandle = mPrincipalHandle;
chunk.mBufferFormat = mSampleFormat;
IncrementIndex();
return chunk;
}
void AudioChunkList::Update(uint32_t aChannels) {
MOZ_ASSERT(mChunks.Length());
if (mChunks[0].ChannelCount() == aChannels) {
return;
}
// Special handling between mono and stereo to avoid reallocations.
if (aChannels <= 2 && mChunks[0].ChannelCount() <= 2) {
UpdateToMonoOrStereo(aChannels);
return;
}
uint32_t numOfChunks = mChunks.Length();
mChunks.ClearAndRetainStorage();
CreateChunks(numOfChunks, aChannels);
}
} // namespace mozilla
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