// aTime is the time in ms the samples were inserted into MediaStreamGraph
nsresult
AudioStream::Write(const AudioDataValue* aBuf, uint32_t aFrames)
{
MonitorAutoLock mon(mMonitor);
if (mState == ERRORED) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(mState == INITIALIZED || mState == STARTED || mState == RUNNING,
"Stream write in unexpected state.");
// Downmix to Stereo.
if (mChannels > 2 && mChannels <= 8) {
DownmixAudioToStereo(const_cast<AudioDataValue*> (aBuf), mChannels, aFrames);
} else if (mChannels > 8) {
return NS_ERROR_FAILURE;
}
if (mChannels >= 2 && mIsMonoAudioEnabled) {
DownmixStereoToMono(const_cast<AudioDataValue*> (aBuf), aFrames);
}
const uint8_t* src = reinterpret_cast<const uint8_t*>(aBuf);
uint32_t bytesToCopy = FramesToBytes(aFrames);
while (bytesToCopy > 0) {
uint32_t available = std::min(bytesToCopy, mBuffer.Available());
MOZ_ASSERT(available % mBytesPerFrame == 0,
"Must copy complete frames.");
mBuffer.AppendElements(src, available);
src += available;
bytesToCopy -= available;
if (bytesToCopy > 0) {
// If we are not playing, but our buffer is full, start playing to make
// room for soon-to-be-decoded data.
if (mState != STARTED && mState != RUNNING) {
MOZ_LOG(gAudioStreamLog, LogLevel::Warning, ("Starting stream %p in Write (%u waiting)",
this, bytesToCopy));
StartUnlocked();
if (mState == ERRORED) {
return NS_ERROR_FAILURE;
}
}
MOZ_LOG(gAudioStreamLog, LogLevel::Warning, ("Stream %p waiting in Write() (%u waiting)",
this, bytesToCopy));
mon.Wait();
}
}
mWritten += aFrames;
return NS_OK;
}
bool
AudioStream::Downmix(Chunk* aChunk)
{
if (aChunk->Rate() != mInRate) {
LOGW("mismatched sample %u, mInRate=%u", aChunk->Rate(), mInRate);
return false;
}
if (aChunk->Channels() > 8) {
return false;
}
if (aChunk->Channels() > 2 && aChunk->Channels() <= 8) {
DownmixAudioToStereo(aChunk->GetWritable(),
aChunk->Channels(),
aChunk->Frames());
}
if (aChunk->Channels() >= 2 && mIsMonoAudioEnabled) {
DownmixStereoToMono(aChunk->GetWritable(), aChunk->Frames());
}
return true;
}
