public IEnumerable<AudioChunk> StreamData( Stream source )
{
infoBuffer.Length = 0;
info = new AudioChunk();
PrimitiveReader reader = new PrimitiveReader( source );
string signature = reader.ReadASCIIString( 4 );
if( signature != "FORM" )
throw new InvalidDataException( "Invalid initial signature." );
reader.BigEndian = true;
int formChunkSize = reader.ReadInt32();
AppendInfoLine( 0, "-- Begin info --" );
AppendInfoLine( 0, "{0} (Chunk size: {1} bytes, {2} KB, {3} MB)", signature,
formChunkSize, formChunkSize / 1024, formChunkSize / 1024 / 1024 );
string format = reader.ReadASCIIString( 4 );
switch( format ) {
case "AIFF":
break;
//http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/Docs/AIFF-C.9.26.91.pdf
case "AIFC":
aifcFormat = true;
break;
default:
throw new InvalidDataException( "Invalid initial signature." );
}
AiffChunkHeader chunk;
while( true ) {
chunk = ReadChunkHeader( reader );
AppendInfoLine( 1, "{0} (Chunk size: {1})", chunk.Signature, chunk.DataSize );
if( chunk.Signature == "COMM" ) {
ProcessCommonChunk( chunk, reader );
} else if( chunk.Signature == "SSND" ) {
break;
} else {
SkipChunkData( reader, chunk.DataSize );
}
}
AppendInfoLine( 0, "-- End info --" );
fileinfo = infoBuffer.ToString();
return StreamDataCore( chunk, reader );
}
public IEnumerable<AudioChunk> StreamData( Stream source )
{
infoBuffer.Length = 0;
chunk = new AudioChunk();
PrimitiveReader reader = new PrimitiveReader( source );
string signature = reader.ReadASCIIString( 4 );
if( signature != ".snd" ) {
throw new InvalidDataException( "Invalid initial signature." );
}
AppendInfoLine( 0, "-- Begin info --" );
reader.BigEndian = true;
uint dataOffset = reader.ReadUInt32();
AppendInfoLine( 0, "Data offset: {0}", dataOffset );
uint dataSize = reader.ReadUInt32();
if( dataSize == 0xFFFFFFFF ) {
dataLength = source.Length - dataOffset;
} else {
dataLength = dataSize;
}
AppendInfoLine( 0, "Data length: {0}", dataLength );
AuEncoding encoding = (AuEncoding)reader.ReadUInt32();
AppendInfoLine( 0, "Encoding: {0}", encoding );
uint sampleRate = reader.ReadUInt32();
AppendInfoLine( 0, "Sample rate: {0}", sampleRate );
uint channels = reader.ReadUInt32();
AppendInfoLine( 0, "Channels: {0}", channels );
if( dataOffset > 24 ) {
int infoLength = (int)( dataOffset - 24 );
string info = reader.ReadASCIIString( infoLength );
AppendInfoLine( 0, "Info: {0}", info );
}
int bitsPerSample = bitsPerSampleEncoding[(int)encoding];
int adjustedBitsPerSample = paddedBitsPerSampleEncoding[(int)encoding];
bufferSize = (int)( sampleRate * channels * adjustedBitsPerSample / 8 );
AppendInfoLine( 0, "-- End info --" );
fileinfo = infoBuffer.ToString();
return StreamDataCore( reader );
}
void SendNextBuffer( AudioChunk chunk )
{
Console.WriteLine( "send buffer " + buffersIndex );
WaveHeader header = new WaveHeader();
byte[] data = chunk.Data;
GCHandle bufferHandle = GCHandle.Alloc( data, GCHandleType.Pinned );
header.DataBuffer = bufferHandle.AddrOfPinnedObject();
header.BufferLength = data.Length;
header.Loops = 1;
UserData userData = new UserData();
userData.BufferHandle = bufferHandle;
userData.Index = buffersIndex;
GCHandle userDataHandle = GCHandle.Alloc( userData, GCHandleType.Pinned );
header.UserData = GCHandle.ToIntPtr( userDataHandle );
buffers[buffersIndex] = header;
uint result = PrepareHeader( handle, ref buffers[buffersIndex], (uint)waveHeaderSize );
CheckError( result );
result = Write( handle, ref buffers[buffersIndex], (uint)waveHeaderSize );
CheckError( result );
}
void InitWinMm( AudioChunk chunk )
{
handle = IntPtr.Zero;
WaveFormatEx format = new WaveFormatEx();
format.Channels = (ushort)chunk.Channels;
format.ExtraSize = 0;
format.FormatTag = WaveFormatTag.Pcm;
format.BitsPerSample = (ushort)chunk.BitsPerSample;
format.BlockAlign = (ushort)( format.Channels * format.BitsPerSample / 8 );
format.SampleRate = (uint)chunk.Frequency;
format.AverageBytesPerSecond = chunk.Frequency * format.BlockAlign;
WaveOpenFlags flags = WaveOpenFlags.CallbackFunction;
callback = ProcessWaveOutCallback;
uint result = Open( out handle, new UIntPtr( (uint)0xFFFF ), ref format, callback, UIntPtr.Zero, flags );
CheckError( result );
}
public IEnumerable<AudioChunk> StreamData( Stream source )
{
PrimitiveReader reader = new PrimitiveReader( source );
reader.BigEndian = true;
while( true ) {
#region Frame header
FlacBitReader bitReader = new FlacBitReader( reader );
bitReader.BigEndian = true;
int syncCode = bitReader.ReadBits( 14 );
if( syncCode != 0x3FFE ) {
throw new InvalidDataException( "Invalid synchronisation code." );
}
int reserved = bitReader.ReadBit();
bool variableBlockSize = bitReader.ReadBit() != 0;
int blockSizeFlags = bitReader.ReadBits( 4 );
int sampleRateFlags = bitReader.ReadBits( 4 );
int channelAssignment = bitReader.ReadBits( 4 );
int sampleSizeFlags = bitReader.ReadBits( 3 );
if( bitReader.ReadBit() != 0 )
throw new InvalidDataException( "Reserved bit is not 0." );
byte[] numberData = ReadRawUTF8Char( reader );
/*int frameNumber = numberData[0];
for( int i = 1; i < numberData.Length; i++ ) {
frameNumber <<= 6;
frameNumber |= numberData[i];
}
Console.WriteLine( frameNumber );*/
int blockSize = 0;
if( blockSizeFlags == 0x0 ) {
throw new InvalidDataException( "0 is reserved for block sizes." );
} else if( blockSizeFlags == 0x1 ) {
blockSize = 192;
} else if( blockSizeFlags >= 0x2 && blockSizeFlags <= 0x5 ) {
blockSize = 576 * ( 1 << ( blockSizeFlags - 2 ) ); // 2^x.
} else if( blockSizeFlags == 0x6 ) {
blockSize = reader.ReadByte() + 1;
} else if( blockSizeFlags == 0x7 ) {
blockSize = reader.ReadUInt16() + 1;
} else {
blockSize = 256 * ( 1 << ( blockSizeFlags - 8 ) ); // 2^x.
}
int sampleRate = 0;
if( sampleRateFlags == 0x0 ) {
sampleRate = metaSampleRate;
} else if( sampleRateFlags >= 0x01 && sampleRateFlags <= 0xB ) {
sampleRate = sampleRates[sampleRateFlags];
} else if( sampleRateFlags == 0xC ) {
sampleRate = reader.ReadByte();
} else if( sampleRateFlags == 0xD ) {
sampleRate = reader.ReadUInt16();
} else if( sampleRateFlags == 0xE ) {
sampleRate = reader.ReadUInt16() * 10;
} else {
throw new InvalidDataException( "Invalid sample rate flag." );
}
int bitsPerSample;
if( sampleSizeFlags == 0 ) {
bitsPerSample = metaBitsPerSample;
} else if( sampleSizeFlags == 0x3 || sampleRateFlags == 0x7 ) {
throw new InvalidDataException( "Sample size is reserved." );
} else {
bitsPerSample = bitSampleSizes[sampleSizeFlags];
}
int channelsCount;
ChannelAssignment soundAssignment = (ChannelAssignment)channelAssignment;
if( channelAssignment < 0x08 ) {
channelsCount = channelAssignment + 1;
} else if( channelAssignment < 0x0B ) {
channelsCount = 2;
} else {
throw new InvalidDataException( "Channel assignment values > 1010 are reserved." );
}
byte crc8 = reader.ReadByte();
#endregion
#region Subframe
int[][] channelsData = new int[channelsCount][];
for( int i = 0; i < channelsCount; i++ ) {
if( bitReader.ReadBit() != 0 ) {
throw new InvalidDataException( "Padding bit should be 0." );
}
int[] channelData = null;
int subframeType = bitReader.ReadBits( 6 );
bool wastedBitsPerSampleFlag = bitReader.ReadBit() != 0;
int adjustedBitsPerSample = bitsPerSample;
switch( soundAssignment ) {
case ChannelAssignment.LeftSide:
if( i == 1 ) adjustedBitsPerSample++;
break;
case ChannelAssignment.RightSide:
if( i == 0 ) adjustedBitsPerSample++;
break;
case ChannelAssignment.MidSide:
if( i == 1 ) adjustedBitsPerSample++;
break;
}
int wastedBitsPerSample = 0;
if( wastedBitsPerSampleFlag ) {
wastedBitsPerSample = 1 + bitReader.ReadUnary();
}
if( subframeType == 0x00 ) {
channelData = ProcessConstantSubframe( bitReader, adjustedBitsPerSample, blockSize );
} else if( subframeType == 0x01 ) {
channelData = ProcessVerbatimSubframe( bitReader, adjustedBitsPerSample, blockSize );
} else {
if( ( subframeType & 0x20 ) != 0 ) {
int order = ( subframeType & 0x1F ) + 1;
channelData = ProcessLpcSubframe( bitReader, adjustedBitsPerSample, order, blockSize );
} else if( ( subframeType & 0x08 ) != 0 ) {
int order = subframeType & 0x07;
channelData = ProcessFixedSubframe( bitReader, adjustedBitsPerSample, order, blockSize );
}
}
channelsData[i] = channelData;
}
bitReader.SkipRemainingBits();
#endregion
// Transform the samples into left right
switch( soundAssignment ) {
case ChannelAssignment.LeftSide:
TransformSamplesLS( channelsData[0], channelsData[1] );
break;
case ChannelAssignment.RightSide:
TransformSamplesSR( channelsData[0], channelsData[1] );
break;
case ChannelAssignment.MidSide:
TransformSamplesMS( channelsData[0], channelsData[1] );
break;
}
int bytesPerSample = (int)Math.Ceiling( bitsPerSample / 8.0 );
byte[] data = new byte[channelsCount * bytesPerSample * blockSize];
bool use16Bits = bitsPerSample <= 16;
bool use8Bits = bitsPerSample <= 8;
int offset = 0;
for( int i = 0; i < blockSize; i++ ) {
for( int ch = 0; ch < channelsCount; ch++ ) {
int[] channelData = channelsData[ch];
if( use16Bits ) {
ushort sample = (ushort)channelData[i];
data[offset++] = (byte)( sample );
data[offset++] = (byte)( sample >> 8 );
} else if( use8Bits ) {
data[offset++] = (byte)channelData[i];
}
}
}
// Read frame footer
ushort crc16 = reader.ReadUInt16();
AudioChunk chunk = new AudioChunk();
chunk.Frequency = sampleRate;
chunk.Channels = channelsCount;
chunk.BitsPerSample = bitsPerSample;
chunk.Data = data;
yield return chunk;
}
}
