public bool TryDequeue (out FLACPacket packet)
{
return mQueue.TryDequeue (out packet);
}
public void Enqueue (FLACPacket packet)
{
mQueue.Enqueue (packet);
}
public bool TryPeek (out FLACPacket packet)
{
return mQueue.TryPeek (out packet);
}
/// <summary>
/// FLAC Write Call Back - libFlac notifies back on a frame that was read from the source file and written as a frame
/// </summary>
/// <param name="context"></param>
/// <param name="frame"></param>
/// <param name="buffer"></param>
/// <param name="clientData"></param>
protected LibFLAC.StreamDecoderWriteStatus WriteCallback(IntPtr context, IntPtr frame, IntPtr buffer, IntPtr clientData)
{
// Read the FLAC Frame into a memory samples buffer (m_flacSamples)
LibFLAC.FlacFrame flacFrame = (LibFLAC.FlacFrame)Marshal.PtrToStructure(frame, typeof(LibFLAC.FlacFrame));
// TODO: Write functions for handling 8-bit audio as well
if (flacFrame.Header.BitsPerSample != 16)
{
mLogger.Warning(string.Format("FLAC: Unsupported bit-rate: {0}", flacFrame.Header.BitsPerSample));
return LibFLAC.StreamDecoderWriteStatus.WriteStatusAbort;
}
// TODO : POSSIBLE OPTIMIZATION - FLACPacket object pool
var packet = new FLACPacket ();
packet.Channels = flacFrame.Header.Channels;
//packet.Format = this.Format;
packet.SampleRate = flacFrame.Header.SampleRate;
packet.BlockSize = flacFrame.Header.BlockSize;
packet.Offset = 0;
CopyRawFLACBufferData (buffer, 0, ref mFLACChannelData_Mono_0, packet.BlockSize);
// 16 bit only
if (packet.Channels == 2)
{
// Stereo
CopyRawFLACBufferData (buffer, 1, ref mFLACChannelData_Stereo_1, packet.BlockSize);
// TODO : POSSIBLE OPTIMIZATION - byte[] object pool
packet.Data = new byte[4 * packet.BlockSize];
uint writePosition = 0;
for(uint i = 0; i < packet.BlockSize; i++)
{
int leftChannel = mFLACChannelData_Mono_0[i];
int rightChannel = mFLACChannelData_Stereo_1[i];
packet.Data[writePosition++] = (byte)(leftChannel >> 0);
packet.Data[writePosition++] =(byte)(leftChannel >> 8);
packet.Data[writePosition++] = (byte)(rightChannel >> 0);
packet.Data[writePosition++] = (byte)(rightChannel >> 8);
}
}
else
{
// TODO : POSSIBLE OPTIMIZATION - byte[] object pool
packet.Data = new byte[2 * packet.BlockSize];
uint writePosition = 0;
// Mono
for(uint i = 0; i < packet.BlockSize; i++)
{
int leftChannel = mFLACChannelData_Mono_0[i];
packet.Data[writePosition++] = (byte)(leftChannel >> 0);
packet.Data[writePosition++] = (byte)(leftChannel >> 8);
}
}
mPacketQueue.Enqueue (packet);
return LibFLAC.StreamDecoderWriteStatus.WriteStatusContinue;
}