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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "WAVDecoder.h"
#include "AudioSampleFormat.h"
#include "BufferReader.h"
#include "VideoUtils.h"
#include "mozilla/Casting.h"
#include "mozilla/SyncRunnable.h"
namespace mozilla {
int16_t DecodeALawSample(uint8_t aValue) {
aValue = aValue ^ 0x55;
int8_t sign = (aValue & 0x80) ? -1 : 1;
uint8_t exponent = (aValue & 0x70) >> 4;
uint8_t mantissa = aValue & 0x0F;
int16_t sample = mantissa << 4;
switch (exponent) {
case 0:
sample += 8;
break;
case 1:
sample += 0x108;
break;
default:
sample += 0x108;
sample <<= exponent - 1;
}
return sign * sample;
}
int16_t DecodeULawSample(uint8_t aValue) {
aValue = aValue ^ 0xFF;
int8_t sign = (aValue & 0x80) ? -1 : 1;
uint8_t exponent = (aValue & 0x70) >> 4;
uint8_t mantissa = aValue & 0x0F;
int16_t sample = (33 + 2 * mantissa) * (2 << (exponent + 1)) - 33;
return sign * sample;
}
WaveDataDecoder::WaveDataDecoder(const CreateDecoderParams& aParams)
: mInfo(aParams.AudioConfig()) {}
RefPtr<ShutdownPromise> WaveDataDecoder::Shutdown() {
// mThread may not be set if Init hasn't been called first.
MOZ_ASSERT(!mThread || mThread->IsOnCurrentThread());
return ShutdownPromise::CreateAndResolve(true, __func__);
}
RefPtr<MediaDataDecoder::InitPromise> WaveDataDecoder::Init() {
mThread = GetCurrentSerialEventTarget();
return InitPromise::CreateAndResolve(TrackInfo::kAudioTrack, __func__);
}
RefPtr<MediaDataDecoder::DecodePromise> WaveDataDecoder::Decode(
MediaRawData* aSample) {
MOZ_ASSERT(mThread->IsOnCurrentThread());
size_t aLength = aSample->Size();
BufferReader aReader(aSample->Data(), aLength);
int64_t aOffset = aSample->mOffset;
int32_t frames = aLength * 8 / mInfo.mBitDepth / mInfo.mChannels;
AlignedAudioBuffer buffer(frames * mInfo.mChannels);
if (!buffer) {
return DecodePromise::CreateAndReject(
MediaResult(NS_ERROR_OUT_OF_MEMORY, __func__), __func__);
}
for (int i = 0; i < frames; ++i) {
for (unsigned int j = 0; j < mInfo.mChannels; ++j) {
if (mInfo.mProfile == 3) { // IEEE Float Data
auto res = aReader.ReadLEU32();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
float sample = BitwiseCast<float>(res.unwrap());
buffer[i * mInfo.mChannels + j] =
FloatToAudioSample<AudioDataValue>(sample);
} else if (mInfo.mProfile == 6) { // ALAW Data
auto res = aReader.ReadU8();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
int16_t decoded = DecodeALawSample(res.unwrap());
buffer[i * mInfo.mChannels + j] =
IntegerToAudioSample<AudioDataValue>(decoded);
} else if (mInfo.mProfile == 7) { // ULAW Data
auto res = aReader.ReadU8();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
int16_t decoded = DecodeULawSample(res.unwrap());
buffer[i * mInfo.mChannels + j] =
IntegerToAudioSample<AudioDataValue>(decoded);
} else { // PCM Data
if (mInfo.mBitDepth == 8) {
auto res = aReader.ReadU8();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
buffer[i * mInfo.mChannels + j] =
UInt8bitToAudioSample<AudioDataValue>(res.unwrap());
} else if (mInfo.mBitDepth == 16) {
auto res = aReader.ReadLE16();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
buffer[i * mInfo.mChannels + j] =
IntegerToAudioSample<AudioDataValue>(res.unwrap());
} else if (mInfo.mBitDepth == 24) {
auto res = aReader.ReadLE24();
if (res.isErr()) {
return DecodePromise::CreateAndReject(
MediaResult(res.unwrapErr(), __func__), __func__);
}
buffer[i * mInfo.mChannels + j] =
Int24bitToAudioSample<AudioDataValue>(res.unwrap());
}
}
}
}
return DecodePromise::CreateAndResolve(
DecodedData{new AudioData(aOffset, aSample->mTime, std::move(buffer),
mInfo.mChannels, mInfo.mRate)},
__func__);
}
RefPtr<MediaDataDecoder::DecodePromise> WaveDataDecoder::Drain() {
MOZ_ASSERT(mThread->IsOnCurrentThread());
return DecodePromise::CreateAndResolve(DecodedData(), __func__);
}
RefPtr<MediaDataDecoder::FlushPromise> WaveDataDecoder::Flush() {
MOZ_ASSERT(mThread->IsOnCurrentThread());
return FlushPromise::CreateAndResolve(true, __func__);
}
/* static */
bool WaveDataDecoder::IsWave(const nsACString& aMimeType) {
// Some WebAudio uses "audio/x-wav",
// WAVdemuxer uses "audio/wave; codecs=aNum".
return aMimeType.EqualsLiteral("audio/x-wav") ||
aMimeType.EqualsLiteral("audio/wave; codecs=1") ||
aMimeType.EqualsLiteral("audio/wave; codecs=3") ||
aMimeType.EqualsLiteral("audio/wave; codecs=6") ||
aMimeType.EqualsLiteral("audio/wave; codecs=7") ||
aMimeType.EqualsLiteral("audio/wave; codecs=65534");
}
} // namespace mozilla
#undef LOG
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