void SoundFileWriterOgg::write(const Int16* samples, Uint64 count)
{
// Vorbis has issues with buffers that are too large, so we ask for 64K
static const int bufferSize = 65536;
// A frame contains a sample from each channel
int frameCount = static_cast<int>(count / m_channelCount);
while (frameCount > 0)
{
// Prepare a buffer to hold our samples
float** buffer = vorbis_analysis_buffer(&m_state, bufferSize);
assert(buffer);
// Write the samples to the buffer, converted to float
for (int i = 0; i < std::min(frameCount, bufferSize); ++i)
for (unsigned int j = 0; j < m_channelCount; ++j)
buffer[j][i] = *samples++ / 32767.0f;
// Tell the library how many samples we've written
vorbis_analysis_wrote(&m_state, std::min(frameCount, bufferSize));
frameCount -= bufferSize;
// Flush any produced block
flushBlocks();
}
}
Block *ABFile::getWriteBlock(off_t offset) {
Lock l(mMutex);
int blocknr = BLOCKNR(offset);
std::_Rb_tree_iterator<std::pair<const int, Block*> > blockit;
blockit = mBlocks.find(blocknr);
if (blockit == mBlocks.end()) {
Block *block = new Block(this, blocknr);
block->mLastUse = mCounter++;
mBlocks[blocknr] = block;
flushBlocks();
return block;
} else
return blockit->second;
}
void SoundFileWriterOgg::close()
{
if (m_file.is_open())
{
// Submit an empty packet to mark the end of stream
vorbis_analysis_wrote(&m_state, 0);
flushBlocks();
// Close the file
m_file.close();
}
// Clear all the ogg/vorbis structures
ogg_stream_clear(&m_ogg);
vorbis_dsp_clear(&m_state);
vorbis_info_clear(&m_vorbis);
}