uint32_t
BufferedAudioStream::Available()
{
MonitorAutoLock mon(mMonitor);
NS_ABORT_IF_FALSE(mBuffer.Length() % mBytesPerFrame == 0, "Buffer invariant violated.");
return BytesToFrames(mBuffer.Available());
}
void
BufferedAudioStream::Drain()
{
MonitorAutoLock mon(mMonitor);
if (mState != STARTED) {
NS_ASSERTION(mBuffer.Available() == 0, "Draining with unplayed audio");
return;
}
mState = DRAINING;
while (mState == DRAINING) {
mon.Wait();
}
}
nsresult
nsBufferedAudioStream::Write(const AudioDataValue* aBuf, uint32_t aFrames)
{
MonitorAutoLock mon(mMonitor);
if (!mCubebStream || mState == ERRORED) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(mState == INITIALIZED || mState == STARTED, "Stream write in unexpected state.");
const uint8_t* src = reinterpret_cast<const uint8_t*>(aBuf);
uint32_t bytesToCopy = aFrames * mBytesPerFrame;
while (bytesToCopy > 0) {
uint32_t available = NS_MIN(bytesToCopy, mBuffer.Available());
NS_ABORT_IF_FALSE(available % mBytesPerFrame == 0, "Must copy complete frames.");
mBuffer.AppendElements(src, available);
src += available;
bytesToCopy -= available;
if (mState != STARTED) {
int r;
{
MonitorAutoUnlock mon(mMonitor);
r = cubeb_stream_start(mCubebStream);
}
mState = r == CUBEB_OK ? STARTED : ERRORED;
}
if (mState != STARTED) {
return NS_ERROR_FAILURE;
}
if (bytesToCopy > 0) {
mon.Wait();
}
}
return NS_OK;
}
nsresult
BufferedAudioStream::Write(const AudioDataValue* aBuf, uint32_t aFrames)
{
MonitorAutoLock mon(mMonitor);
if (!mCubebStream || mState == ERRORED) {
return NS_ERROR_FAILURE;
}
NS_ASSERTION(mState == INITIALIZED || mState == STARTED,
"Stream write in unexpected state.");
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());
NS_ABORT_IF_FALSE(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) {
StartUnlocked();
if (mState != STARTED) {
return NS_ERROR_FAILURE;
}
}
mon.Wait();
}
}
mWritten += aFrames;
return NS_OK;
}
