private IEnumerator <ArraySegment <byte> > ReadFlacSpliter(FlacStreaminfo info, Stream body)
{
IFlacReader reader = null;
try
{
streaminfo = info;
ValidateBitPerSample(streaminfo.BitsPerSample);
ValidateTotalSamples(streaminfo.TotalSampleCount);
reader = new FlacSpliteReader(streaminfo, body, true);
InitializeHelpers(reader);
while (reader.Read())
{
if (reader.RecordType == FlacRecordType.Frame)
{
yield return(ReadFrame(reader));
}
}
}
finally
{
if (reader != null)
{
reader.Close();
}
}
}
private void InitializeHelpers(IFlacReader reader)
{
sampleTransform = WaveSampleTransformerFactory.CreateWaveSampleTransformer(reader.Streaminfo.BitsPerSample);
int bufferSize =
reader.Streaminfo.MaxBlockSize * ((reader.Streaminfo.ChannelsCount * reader.Streaminfo.BitsPerSample) >> 3);
pcmBuffer = new byte[bufferSize];
}
internal override IEnumerable <int> MixSamples(IFlacReader reader)
{
int blockSize = reader.BlockSize;
int channelCount = reader.Streaminfo.ChannelsCount;
List <int[]> channelData = new List <int[]>(channelCount);
while (reader.Read() && reader.RecordType == FlacRecordType.Subframe)
{
int[] data = reader.ReadSubframeValues();
channelData.Add(data);
}
for (int i = 0; i < blockSize; i++)
{
for (int j = 0; j < channelCount; j++)
{
yield return(channelData[j][i]);
}
}
}
internal override IEnumerable <int> MixSamples(IFlacReader reader)
{
if (!reader.Read() || reader.RecordType != FlacRecordType.Subframe)
{
throw new FlacException("Right channel expected");
}
int[] left = reader.ReadSubframeValues();
if (!reader.Read() || reader.RecordType != FlacRecordType.Subframe)
{
throw new FlacException("Side channel expected");
}
int[] side = reader.ReadSubframeValues();
for (int i = 0; i < left.Length; i++)
{
yield return(left[i]);
yield return(left[i] - side[i]);
}
reader.Read();
}
internal override IEnumerable <int> MixSamples(IFlacReader reader)
{
if (!reader.Read() || reader.RecordType != FlacRecordType.Subframe)
{
throw new FlacException("Mid channel expected");
}
int[] mid = reader.ReadSubframeValues();
if (!reader.Read() || reader.RecordType != FlacRecordType.Subframe)
{
throw new FlacException("Side channel expected");
}
int[] side = reader.ReadSubframeValues();
for (int i = 0; i < mid.Length; i++)
{
int right = mid[i] - (side[i] >> 1);
yield return(right + side[i]);
yield return(right);
}
reader.Read();
}
private ArraySegment <byte> ReadFrame(IFlacReader reader)
{
int read = sampleTransform.PackData(reader.GetValues(), pcmBuffer);
return(new ArraySegment <byte>(pcmBuffer, 0, read));
}
internal abstract IEnumerable <int> MixSamples(IFlacReader reader);
