uint32_t
FormatParser::Parse(ByteReader& aReader)
{
while (aReader.CanRead8() && !mFmtChunk.ParseNext(aReader.ReadU8())) { }
if (mFmtChunk.IsValid()) {
return FMT_CHUNK_MIN_SIZE;
}
return 0;
}
uint32_t
RIFFParser::Parse(ByteReader& aReader)
{
while (aReader.CanRead8() && !mRiffHeader.ParseNext(aReader.ReadU8())) { }
if (mRiffHeader.IsValid()) {
return RIFF_CHUNK_SIZE;
}
return 0;
}
uint32_t
HeaderParser::Parse(ByteReader& aReader)
{
while (aReader.CanRead8() && !mHeader.ParseNext(aReader.ReadU8())) { }
if (mHeader.IsValid()) {
return CHUNK_HEAD_SIZE;
}
return 0;
}
bool
WaveDataDecoder::DoDecode(MediaRawData* aSample)
{
size_t aLength = aSample->Size();
ByteReader aReader = ByteReader(aSample->Data(), aLength);
int64_t aOffset = aSample->mOffset;
uint64_t aTstampUsecs = aSample->mTime;
int32_t frames = aLength * 8 / mInfo.mBitDepth / mInfo.mChannels;
auto buffer = MakeUnique<AudioDataValue[]>(frames * mInfo.mChannels);
for (int i = 0; i < frames; ++i) {
for (unsigned int j = 0; j < mInfo.mChannels; ++j) {
if (mInfo.mBitDepth == 8) {
uint8_t v = aReader.ReadU8();
buffer[i * mInfo.mChannels + j] =
UInt8bitToAudioSample<AudioDataValue>(v);
} else if (mInfo.mBitDepth == 16) {
int16_t v = aReader.ReadLE16();
buffer[i * mInfo.mChannels + j] =
IntegerToAudioSample<AudioDataValue>(v);
} else if (mInfo.mBitDepth == 24) {
int32_t v = aReader.ReadLE24();
buffer[i * mInfo.mChannels + j] =
Int24bitToAudioSample<AudioDataValue>(v);
}
}
}
aReader.DiscardRemaining();
int64_t duration = frames / mInfo.mRate;
mCallback->Output(new AudioData(aOffset,
aTstampUsecs,
duration,
frames,
Move(buffer),
mInfo.mChannels,
mInfo.mRate));
mFrames += frames;
return true;
}
