private WriteStatus Write(IntPtr context, IntPtr frame, IntPtr buffer, IntPtr userData)
{
FlacFrame f = (FlacFrame)Marshal.PtrToStructure(frame, typeof(FlacFrame));
int samplesPerChannel = f.Header.BlockSize;
inputBitDepth = f.Header.BitsPerSample;
inputChannels = f.Header.Channels;
inputSampleRate = f.Header.SampleRate;
if (!writer.HasHeader)
{
writer.WriteHeader(inputSampleRate, inputBitDepth, inputChannels);
}
if (totalSamples < 0)
{
totalSamples = FLAC__stream_decoder_get_total_samples(context);
}
if (samples == null)
{
samples = new int[samplesPerChannel * inputChannels];
}
if (samplesChannel == null)
{
samplesChannel = new float[inputChannels];
}
for (int i = 0; i < inputChannels; i++)
{
IntPtr pChannelBits = Marshal.ReadIntPtr(buffer, i * IntPtr.Size);
Marshal.Copy(pChannelBits, samples, i * samplesPerChannel, samplesPerChannel);
}
// For each channel, there are BlockSize number of samples, so let's process these.
for (int i = 0; i < samplesPerChannel; i++)
{
for (int c = 0; c < inputChannels; c++)
{
int v = samples[i + c * samplesPerChannel];
switch (inputBitDepth / 8)
{
case sizeof(short): // 16-bit
writer.WriteInt16(v);
break;
case sizeof(int) - sizeof(byte): // 24-bit
writer.WriteInt24(v);
break;
default:
throw new NotSupportedException("Input FLAC bit depth is not supported!");
}
}
processedSamples += 1;
}
//// Show progress
//if (totalSamples > 0)
// ConsoleProgress.Update(processedSamples, totalSamples);
return(WriteStatus.Continue);
}
