private IEnumerator <ArraySegment <byte> > ReadFlac(FlacReader reader)
{
try
{
while (reader.Read())
{
if (reader.RecordType == FlacRecordType.MetadataBlock &&
reader.MetadataBlockType == FlacMetadataBlockType.Streaminfo)
{
streaminfo = reader.Streaminfo;
ValidateBitPerSample(streaminfo.BitsPerSample);
ValidateTotalSamples(streaminfo.TotalSampleCount);
InitializeHelpers(reader);
byte[] waveHeader = CreateWaveHeader();
yield return(new ArraySegment <byte>(waveHeader));
}
else if (reader.RecordType == FlacRecordType.Frame)
{
yield return(ReadFrame(reader));
}
}
}
finally
{
reader.Close();
}
}
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 ReadStreaminfo(int metadataBlockLength)
{
const int Md5Length = FlacCommons.Md5Length;
const int Md5Offset = FlacCommons.StreaminfoMetadataBlockLengh - Md5Length;
if (metadataBlockLength < FlacCommons.StreaminfoMetadataBlockLengh)
{
throw new FlacException("Invalid STREAMINFO block size");
}
byte[] data = ReadExactly(metadataBlockLength);
FlacStreaminfo streaminfo = new FlacStreaminfo();
streaminfo.MinBlockSize = data[0] << 8 | data[1];
streaminfo.MaxBlockSize = data[2] << 8 | data[3];
streaminfo.MinFrameSize = data[4] << 16 | data[5] << 8 | data[6];
streaminfo.MaxFrameSize = data[7] << 16 | data[8] << 8 | data[9];
streaminfo.SampleRate = (data[10] << 16 | data[11] << 8 | data[12]) >> 4;
streaminfo.ChannelsCount = ((data[12] >> 1) & 0x07) + 1;
streaminfo.BitsPerSample = ((data[12] & 0x01) << 4 | (data[13] >> 4)) + 1;
streaminfo.TotalSampleCount = ((long)(data[13] & 0x0F)) << 32 |
(long)data[14] << 24 | (uint)(data[15] << 16 | data[16] << 8 | data[17]);
streaminfo.MD5 = new byte[Md5Length];
Array.Copy(data, Md5Offset, streaminfo.MD5, 0, Md5Length);
this.streaminfo = streaminfo;
}
public void EndStream()
{
if (bufferSize > 0)
{
FlushBuffer();
}
buffer = null;
this.streaminfo = null;
}
public WaveOverFlacStream(FlacStreaminfo info, Stream Body)
{
if (Body == null)
{
throw new ArgumentNullException("reader");
}
this.dataSource = ReadFlacSpliter(info, Body);
this.mode = WaveOverFlacStreamMode.Decode;
}
public override void Write(byte[] buffer, int offset, int count)
{
int[] samples = new int[count * 8 / bitsPerSample];
if (bitsPerSample == 8)
{
for (int i = 0; i < count; i++)
{
samples[i] = buffer[offset + i];
}
}
else
{
unsafe {
if (offset + count > buffer.Length)
throw new IndexOutOfRangeException();
fixed(byte *rawdata = buffer)
{
if (bitsPerSample == 16)
{
short *data = (short *)(rawdata + offset);
for (int i = 0; i < count / 2; i++)
{
samples[i] = data[i];
}
}
else if (bitsPerSample == 32)
{
int *data = (int *)(rawdata + offset);
for (int i = 0; i < count / 4; i++)
{
samples[i] = data[i];
}
}
}
}
}
var streaminfo = new FlacBox.FlacStreaminfo();
streaminfo.ChannelsCount = 1;
streaminfo.SampleRate = 44100;
streaminfo.BitsPerSample = 16;
streaminfo.MinBlockSize = 4608;
streaminfo.MaxBlockSize = 4608;
writer.StartStreamNoHeader(streaminfo);
writer.WriteSamples(samples);
writer.EndStream();
}
public void StartStream(FlacStreaminfo streaminfo, FlacEncodingPolicy policy)
{
if (policy == null)
{
throw new ArgumentNullException("policy");
}
policy.Validate();
if (streaminfo == null)
{
throw new ArgumentNullException("baseStream");
}
this.streaminfo = streaminfo;
InitializeEstimation(policy);
InitializeBuffer();
WriteFlacHeader();
metaWriter = new StreaminfoWriter(streaminfo);
}
public StreaminfoWriter(FlacStreaminfo streaminfo)
{
this.streaminfo = streaminfo;
}
private IEnumerator<ArraySegment<byte>> ReadFlac(FlacReader reader)
{
try
{
while (reader.Read())
{
if (reader.RecordType == FlacRecordType.MetadataBlock &&
reader.MetadataBlockType == FlacMetadataBlockType.Streaminfo)
{
streaminfo = reader.Streaminfo;
ValidateBitPerSample(streaminfo.BitsPerSample);
ValidateTotalSamples(streaminfo.TotalSampleCount);
InitializeHelpers(reader);
byte[] waveHeader = CreateWaveHeader();
yield return new ArraySegment<byte>( waveHeader );
}
else if (reader.RecordType == FlacRecordType.Frame)
{
yield return ReadFrame(reader);
}
}
}
finally
{
reader.Close();
}
}
public void StartStream(FlacStreaminfo streaminfo)
{
StartStream(streaminfo, FlacEncodingPolicy.CreateFromLevel(DefaultEncodingPolicyLevel));
}
public void StartStream(FlacStreaminfo streaminfo, int level)
{
StartStream(streaminfo, FlacEncodingPolicy.CreateFromLevel(level));
}
private static void EstimateMinAndMaxFrameSize(FlacStreaminfo streaminfo)
{
// unknown
streaminfo.MinFrameSize = 0;
streaminfo.MaxFrameSize = 0;
}
public StreaminfoWriter(FlacStreaminfo streaminfo)
{
this.streaminfo = streaminfo;
}
private void ReadStreaminfo(int metadataBlockLength)
{
const int Md5Length = FlacCommons.Md5Length;
const int Md5Offset = FlacCommons.StreaminfoMetadataBlockLengh - Md5Length;
if (metadataBlockLength < FlacCommons.StreaminfoMetadataBlockLengh)
throw new FlacException("Invalid STREAMINFO block size");
byte[] data = ReadExactly(metadataBlockLength);
FlacStreaminfo streaminfo = new FlacStreaminfo();
streaminfo.MinBlockSize = data[0] << 8 | data[1];
streaminfo.MaxBlockSize = data[2] << 8 | data[3];
streaminfo.MinFrameSize = data[4] << 16 | data[5] << 8 | data[6];
streaminfo.MaxFrameSize = data[7] << 16 | data[8] << 8 | data[9];
streaminfo.SampleRate = (data[10] << 16 | data[11] << 8 | data[12]) >> 4;
streaminfo.ChannelsCount = ((data[12] >> 1) & 0x07) + 1;
streaminfo.BitsPerSample = ((data[12] & 0x01) << 4 | (data[13] >> 4)) + 1;
streaminfo.TotalSampleCount = ((long)(data[13] & 0x0F)) << 32 |
(long)data[14] << 24 | (uint)(data[15] << 16 | data[16] << 8 | data[17]);
streaminfo.MD5 = new byte[Md5Length];
Array.Copy(data, Md5Offset, streaminfo.MD5, 0, Md5Length);
this.streaminfo = streaminfo;
}
private IEnumerator<WriteRequest> WriteFlac(FlacWriter writer, int compressionLevel)
{
try
{
const int RiffHeaderLength = 12;
const int RiffBlockHeaderLength = 8;
const int MinFormatLength = 16;
const int MaxFormatLength = 128;
WriteRequest request = new WriteRequest();
byte[] waveHeader = new byte[RiffHeaderLength];
ArraySegment<byte> buffer = new ArraySegment<byte>(waveHeader);
do
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("RIFF header is expected");
} while (FillBuffer(ref buffer, request));
if (waveHeader[0] != 'R' || waveHeader[1] != 'I' || waveHeader[2] != 'F' || waveHeader[3] != 'F' ||
waveHeader[8] != 'W' || waveHeader[9] != 'A' || waveHeader[10] != 'V' || waveHeader[11] != 'E')
throw new FlacException("RIFF and WAVE header are expected");
long totalStreamLength = BitConverter.ToUInt32(waveHeader, 4);
do
{
byte[] blockHeader = new byte[RiffBlockHeaderLength];
buffer = new ArraySegment<byte>(blockHeader);
while (FillBuffer(ref buffer, request))
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("RIFF block expected");
}
if (blockHeader[0] == 'f' && blockHeader[1] == 'm' && blockHeader[2] == 't' && blockHeader[3] == ' ')
{
int formatBlockSize = BitConverter.ToInt32(blockHeader, 4);
if (formatBlockSize < MinFormatLength || formatBlockSize > MaxFormatLength)
throw new FlacException("Invalid format block size");
byte[] formatBlock = new byte[formatBlockSize];
buffer = new ArraySegment<byte>(formatBlock);
while (FillBuffer(ref buffer, request))
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("format block expected");
}
if(BitConverter.ToUInt16(formatBlock, 0) != 1)
throw new FlacException("Unsupported alignment in WAVE");
FlacStreaminfo streaminfo = new FlacStreaminfo();
streaminfo.ChannelsCount = BitConverter.ToUInt16(formatBlock, 2);
streaminfo.SampleRate = BitConverter.ToInt32(formatBlock, 4);
streaminfo.BitsPerSample = BitConverter.ToUInt16(formatBlock, 14);
streaminfo.MinBlockSize = FlacCommons.DefaultBlockSize;
streaminfo.MaxBlockSize = FlacCommons.DefaultBlockSize;
EstimateMinAndMaxFrameSize(streaminfo);
this.streaminfo = streaminfo;
}
else if (blockHeader[0] == 'd' && blockHeader[1] == 'a' && blockHeader[2] == 't' && blockHeader[3] == 'a')
{
uint dataBlockSize = BitConverter.ToUInt32(blockHeader, 4);
if (streaminfo == null)
throw new FlacException("Format block was not found");
int bytesPerInterChannelSample = (streaminfo.ChannelsCount * streaminfo.BitsPerSample) >> 3;
long totalSamples = dataBlockSize / bytesPerInterChannelSample;
streaminfo.TotalSampleCount = totalSamples;
sampleTransform = WaveSampleTransformerFactory.CreateWaveSampleTransformer(streaminfo.BitsPerSample);
try
{
writer.StartStream(streaminfo);
int samplesInBuffer = streaminfo.MaxBlockSize;
pcmBuffer = new byte[bytesPerInterChannelSample * samplesInBuffer];
long currentSample = 0;
int[] samples = new int[streaminfo.ChannelsCount * samplesInBuffer];
while (currentSample + samplesInBuffer <= totalSamples)
{
buffer = new ArraySegment<byte>(pcmBuffer);
while (FillBuffer(ref buffer, request))
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("data block expected");
}
sampleTransform.UnpackData(pcmBuffer, samples);
writer.WriteSamples(samples);
currentSample += samplesInBuffer;
}
if (currentSample < totalSamples)
{
int samplesLeft = (int)(totalSamples - currentSample);
buffer = new ArraySegment<byte>(pcmBuffer, 0, bytesPerInterChannelSample * samplesLeft);
while (FillBuffer(ref buffer, request))
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("data block expected");
}
samples = new int[streaminfo.ChannelsCount * samplesLeft];
sampleTransform.UnpackData(pcmBuffer, samples);
writer.WriteSamples(samples);
}
}
finally
{
writer.EndStream();
}
break;
}
else // otherwise skip
{
uint dataBlockSize = BitConverter.ToUInt32(blockHeader, 4);
byte[] extraData = new byte[(int)dataBlockSize];
buffer = new ArraySegment<byte>(extraData);
while (FillBuffer(ref buffer, request))
{
yield return request;
if (!request.IsDataPresent)
throw new FlacException("extra data is expected");
}
}
} while (request.IsDataPresent);
}
finally
{
writer.Close();
}
}
public FlacSpliteReader(FlacStreaminfo info, Stream baseStream, bool leaveOpen)
{
this.streaminfo = info;
this.baseStream = baseStream;
this.leaveOpen = leaveOpen;
}
public void EndStream()
{
if (bufferSize > 0) FlushBuffer();
buffer = null;
this.streaminfo = null;
}
public void StartStream(FlacStreaminfo streaminfo, FlacEncodingPolicy policy)
{
if (policy == null) throw new ArgumentNullException("policy");
policy.Validate();
if (streaminfo == null) throw new ArgumentNullException("baseStream");
this.streaminfo = streaminfo;
InitializeEstimation(policy);
InitializeBuffer();
WriteFlacHeader();
metaWriter = new StreaminfoWriter(streaminfo);
}
public void StartStream(FlacStreaminfo streaminfo, int level)
{
StartStream(streaminfo, FlacEncodingPolicy.CreateFromLevel(level));
}
public void StartStream(FlacStreaminfo streaminfo)
{
StartStream(streaminfo, FlacEncodingPolicy.CreateFromLevel(DefaultEncodingPolicyLevel));
}
private static void EstimateMinAndMaxFrameSize(FlacStreaminfo streaminfo)
{
// unknown
streaminfo.MinFrameSize = 0;
streaminfo.MaxFrameSize = 0;
}
private IEnumerator <WriteRequest> WriteFlac(FlacWriter writer, int compressionLevel)
{
try
{
const int RiffHeaderLength = 12;
const int RiffBlockHeaderLength = 8;
const int MinFormatLength = 16;
const int MaxFormatLength = 128;
WriteRequest request = new WriteRequest();
byte[] waveHeader = new byte[RiffHeaderLength];
ArraySegment <byte> buffer = new ArraySegment <byte>(waveHeader);
do
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("RIFF header is expected");
}
} while (FillBuffer(ref buffer, request));
if (waveHeader[0] != 'R' || waveHeader[1] != 'I' || waveHeader[2] != 'F' || waveHeader[3] != 'F' ||
waveHeader[8] != 'W' || waveHeader[9] != 'A' || waveHeader[10] != 'V' || waveHeader[11] != 'E')
{
throw new FlacException("RIFF and WAVE header are expected");
}
long totalStreamLength = BitConverter.ToUInt32(waveHeader, 4);
do
{
byte[] blockHeader = new byte[RiffBlockHeaderLength];
buffer = new ArraySegment <byte>(blockHeader);
while (FillBuffer(ref buffer, request))
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("RIFF block expected");
}
}
if (blockHeader[0] == 'f' && blockHeader[1] == 'm' && blockHeader[2] == 't' && blockHeader[3] == ' ')
{
int formatBlockSize = BitConverter.ToInt32(blockHeader, 4);
if (formatBlockSize < MinFormatLength || formatBlockSize > MaxFormatLength)
{
throw new FlacException("Invalid format block size");
}
byte[] formatBlock = new byte[formatBlockSize];
buffer = new ArraySegment <byte>(formatBlock);
while (FillBuffer(ref buffer, request))
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("format block expected");
}
}
if (BitConverter.ToUInt16(formatBlock, 0) != 1)
{
throw new FlacException("Unsupported alignment in WAVE");
}
FlacStreaminfo streaminfo = new FlacStreaminfo();
streaminfo.ChannelsCount = BitConverter.ToUInt16(formatBlock, 2);
streaminfo.SampleRate = BitConverter.ToInt32(formatBlock, 4);
streaminfo.BitsPerSample = BitConverter.ToUInt16(formatBlock, 14);
streaminfo.MinBlockSize = FlacCommons.DefaultBlockSize;
streaminfo.MaxBlockSize = FlacCommons.DefaultBlockSize;
EstimateMinAndMaxFrameSize(streaminfo);
this.streaminfo = streaminfo;
}
else if (blockHeader[0] == 'd' && blockHeader[1] == 'a' && blockHeader[2] == 't' && blockHeader[3] == 'a')
{
uint dataBlockSize = BitConverter.ToUInt32(blockHeader, 4);
if (streaminfo == null)
{
throw new FlacException("Format block was not found");
}
int bytesPerInterChannelSample = (streaminfo.ChannelsCount * streaminfo.BitsPerSample) >> 3;
long totalSamples = dataBlockSize / bytesPerInterChannelSample;
streaminfo.TotalSampleCount = totalSamples;
sampleTransform = WaveSampleTransformerFactory.CreateWaveSampleTransformer(streaminfo.BitsPerSample);
try
{
writer.StartStream(streaminfo);
int samplesInBuffer = streaminfo.MaxBlockSize;
pcmBuffer = new byte[bytesPerInterChannelSample * samplesInBuffer];
long currentSample = 0;
int[] samples = new int[streaminfo.ChannelsCount * samplesInBuffer];
while (currentSample + samplesInBuffer <= totalSamples)
{
buffer = new ArraySegment <byte>(pcmBuffer);
while (FillBuffer(ref buffer, request))
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("data block expected");
}
}
sampleTransform.UnpackData(pcmBuffer, samples);
writer.WriteSamples(samples);
currentSample += samplesInBuffer;
}
if (currentSample < totalSamples)
{
int samplesLeft = (int)(totalSamples - currentSample);
buffer = new ArraySegment <byte>(pcmBuffer, 0, bytesPerInterChannelSample * samplesLeft);
while (FillBuffer(ref buffer, request))
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("data block expected");
}
}
samples = new int[streaminfo.ChannelsCount * samplesLeft];
sampleTransform.UnpackData(pcmBuffer, samples);
writer.WriteSamples(samples);
}
}
finally
{
writer.EndStream();
}
break;
}
else // otherwise skip
{
uint dataBlockSize = BitConverter.ToUInt32(blockHeader, 4);
byte[] extraData = new byte[(int)dataBlockSize];
buffer = new ArraySegment <byte>(extraData);
while (FillBuffer(ref buffer, request))
{
yield return(request);
if (!request.IsDataPresent)
{
throw new FlacException("extra data is expected");
}
}
}
} while (request.IsDataPresent);
}
finally
{
writer.Close();
}
}
