public unsafe FlacMetadataStreamInfo(Stream stream, Int32 length, bool lastBlock)
: base(FlacMetaDataType.StreamInfo, lastBlock, length)
{
//http://flac.sourceforge.net/format.html#metadata_block_streaminfo
BinaryReader reader = new BinaryReader(stream, Encoding.ASCII);
try
{
MinBlockSize = reader.ReadInt16();
MaxBlockSize = reader.ReadInt16();
}
catch (IOException e)
{
throw new FlacException(e, FlacLayer.Metadata);
}
int bytesToRead = (240 / 8) - 16;
byte[] buffer = reader.ReadBytes(bytesToRead);
if (buffer.Length != bytesToRead)
throw new FlacException(new EndOfStreamException("Could not read StreamInfo-content"), FlacLayer.Metadata);
fixed(byte *b = buffer)
{
FlacBitReader bitreader = new FlacBitReader(b, 0);
MinFrameSize = bitreader.ReadBits(24);
MaxFrameSize = bitreader.ReadBits(24);
SampleRate = (int)bitreader.ReadBits(20);
Channels = 1 + (int)bitreader.ReadBits(3);
BitsPerSample = 1 + (int)bitreader.ReadBits(5);
TotalSamples = (long)bitreader.ReadBits64(36);
MD5 = new String(reader.ReadChars(16));
}
}
public unsafe FlacMetadataStreamInfo(Stream stream, Int32 length, bool lastBlock)
: base(FlacMetaDataType.StreamInfo, lastBlock, length)
{
//http://flac.sourceforge.net/format.html#metadata_block_streaminfo
BinaryReader reader = new BinaryReader(stream, Encoding.ASCII);
try
{
MinBlockSize = reader.ReadInt16();
MaxBlockSize = reader.ReadInt16();
}
catch (IOException e)
{
throw new FlacException(e, FlacLayer.Metadata);
}
int bytesToRead = (240 / 8) - 16;
byte[] buffer = reader.ReadBytes(bytesToRead);
if (buffer.Length != bytesToRead)
throw new FlacException(new EndOfStreamException("Could not read StreamInfo-content"), FlacLayer.Metadata);
fixed (byte* b = buffer)
{
FlacBitReader bitreader = new FlacBitReader(b, 0);
MinFrameSize = bitreader.ReadBits(24);
MaxFrameSize = bitreader.ReadBits(24);
SampleRate = (int)bitreader.ReadBits(20);
Channels = 1 + (int)bitreader.ReadBits(3);
BitsPerSample = 1 + (int)bitreader.ReadBits(5);
TotalSamples = (long)bitreader.ReadBits64(36);
MD5 = new String(reader.ReadChars(16));
}
}
public unsafe FlacSubFrameLPC(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
//warmup
_warmup = new int[FlacConstant.MaxLpcOrder];
for (int i = 0; i < order; i++)
{
_warmup[i] = data.ResidualBuffer[i] = reader.ReadBitsSigned(bps);
}
//header
int u32 = (int)reader.ReadBits(FlacConstant.SubframeLpcQlpCoeffPrecisionLen);
if (u32 == (1 << FlacConstant.SubframeLpcQlpCoeffPrecisionLen) - 1)
{
Debug.WriteLine("Invalid FlacLPC qlp coeff precision.");
return; //return false;
}
_qlpCoeffPrecision = u32 + 1;
int level = reader.ReadBitsSigned(FlacConstant.SubframeLpcQlpShiftLen);
if (level < 0)
throw new Exception("negative shift");
_lpcShiftNeeded = level;
_qlpCoeffs = new int[FlacConstant.MaxLpcOrder];
//qlp coeffs
for (int i = 0; i < order; i++)
{
_qlpCoeffs[i] = reader.ReadBitsSigned(_qlpCoeffPrecision);
}
Residual = new FlacResidual(reader, header, data, order);
for (int i = 0; i < order; i++)
{
data.DestBuffer[i] = data.ResidualBuffer[i];
}
int i1 = order;
int result = 0;
while ((i1 >>= 1) != 0)
{
result++;
}
if (bps + _qlpCoeffPrecision + result <= 32)
{
if (bps <= 16 && _qlpCoeffPrecision <= 16)
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order); //Restore(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
else
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);
}
else
{
RestoreLPCSignalWide(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);//RestoreWide(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
}
public unsafe FlacSubFrameFixed(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
for (int i = 0; i < order; i++)
{
data.ResidualBuffer[i] = data.DestBuffer[i] = reader.ReadBitsSigned(bps);
}
Residual = new FlacResidual(reader, header, data, order); //necessary for decoding
RestoreSignal(data, header.BlockSize - order, order);
}
public unsafe FlacSubFrameFixed(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
for (int i = 0; i < order; i++)
{
data.ResidualBuffer[i] = data.DestBuffer[i] = reader.ReadBitsSigned(bps);
}
Residual = new FlacResidual(reader, header, data, order); //necessary for decoding
RestoreSignal(data, header.BlockSize - order, order);
}
private unsafe void ReadSubFrames()
{
List <FlacSubFrameBase> subFrames = new List <FlacSubFrameBase>();
//alocateOutput
var data = AllocOuputMemory();
_data = data;
byte[] buffer = new byte[0x20000];
if ((_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) > buffer.Length)
{
buffer = new byte[(_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) - FlacConstant.FrameHeaderSize];
}
int read = _stream.Read(buffer, 0, (int)Math.Min(buffer.Length, _stream.Length - _stream.Position));
fixed(byte *ptrBuffer = buffer)
{
FlacBitReader reader = new FlacBitReader(ptrBuffer, 0);
for (int c = 0; c < Header.Channels; c++)
{
int bps = Header.BitsPerSample;
if (Header.ChannelAssignment == ChannelAssignment.MidSide || Header.ChannelAssignment == ChannelAssignment.LeftSide)
{
bps += c;
}
else if (Header.ChannelAssignment == ChannelAssignment.RightSide)
{
bps += 1 - c;
}
var subframe = FlacSubFrameBase.GetSubFrame(reader, data[c], Header, bps);
subFrames.Add(subframe);
}
reader.Flush();
Crc16 = (ushort)reader.ReadBits(16);
_stream.Position -= read - reader.Position;
SamplesToBytes(_data);
//return reader.Position;
}
}
public unsafe static FlacMetadata FromStream(Stream stream)
{
bool lastBlock = false;
FlacMetaDataType type = FlacMetaDataType.Undef;
int length = 0;
byte[] b = new byte[4];
if (stream.Read(b, 0, 4) <= 0)
{
throw new FlacException(new EndOfStreamException("Could not read metadata"), FlacLayer.Metadata);
fixed(byte *headerBytes = b)
{
FlacBitReader bitReader = new FlacBitReader(headerBytes, 0);
lastBlock = bitReader.ReadBits(1) == 1;
type = (FlacMetaDataType)bitReader.ReadBits(7);
length = (int)bitReader.ReadBits(24);
////1000 0000
//if (((b[0] & 0x80) >> 7) == 1)
// lastBlock = true;
//type = (FlacMetaDataType)(b[0] & 0x7F);
//int length = (b[1] + (b[2] << 8) + (b[3] << 16));
}
FlacMetadata data;
long streamStartPosition = stream.Position;
if ((int)type < 0 || (int)type > 6)
return(null); }
switch (type)
{
case FlacMetaDataType.StreamInfo:
data = new FlacMetadataStreamInfo(stream, length, lastBlock);
break;
case FlacMetaDataType.Seektable:
data = new FlacMetadataSeekTable(stream, length, lastBlock);
break;
default:
data = new FlacMetadata(type, lastBlock, length);
break;
}
stream.Seek(length - (stream.Position - streamStartPosition), SeekOrigin.Current);
return(data);
}
public unsafe static FlacMetadata FromStream(Stream stream)
{
bool lastBlock = false;
FlacMetaDataType type = FlacMetaDataType.Undef;
int length = 0;
byte[] b = new byte[4];
if (stream.Read(b, 0, 4) <= 0)
throw new FlacException(new EndOfStreamException("Could not read metadata"), FlacLayer.Metadata);
fixed (byte* headerBytes = b)
{
FlacBitReader bitReader = new FlacBitReader(headerBytes, 0);
lastBlock = bitReader.ReadBits(1) == 1;
type = (FlacMetaDataType)bitReader.ReadBits(7);
length = (int)bitReader.ReadBits(24);
////1000 0000
//if (((b[0] & 0x80) >> 7) == 1)
// lastBlock = true;
//type = (FlacMetaDataType)(b[0] & 0x7F);
//int length = (b[1] + (b[2] << 8) + (b[3] << 16));
}
FlacMetadata data;
long streamStartPosition = stream.Position;
if ((int)type < 0 || (int)type > 6)
return null;
switch (type)
{
case FlacMetaDataType.StreamInfo:
data = new FlacMetadataStreamInfo(stream, length, lastBlock);
break;
case FlacMetaDataType.Seektable:
data = new FlacMetadataSeekTable(stream, length, lastBlock);
break;
default:
data = new FlacMetadata(type, lastBlock, length);
break;
}
stream.Seek(length - (stream.Position - streamStartPosition), SeekOrigin.Current);
return data;
}
public unsafe bool ProcessResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
data.Content.UpdateSize(PartitionOrder);
int porder = PartitionOrder;
FlacEntropyCoding codingMethod = CodingMethod;
int psize = header.BlockSize >> porder;
int resCnt = psize - order;
int ricelength = 4 + (int)codingMethod; //4bit = RICE I | 5bit = RICE II
//residual
int j = order;
int *r = data.ResidualBuffer + j;
int partitioncount = 1 << porder;
for (int p = 0; p < partitioncount; p++)
{
if (p == 1)
{
resCnt = psize;
}
int n = Math.Min(resCnt, header.BlockSize - j);
int k = Content.Parameters[p] = (int)reader.ReadBits(ricelength);
if (k == (1 << ricelength) - 1)
{
k = (int)reader.ReadBits(5);
for (int i = n; i > 0; i--)
{
*(r) = reader.ReadBitsSigned((int)k);
}
}
else
{
ReadFlacRiceBlock(reader, n, (int)k, r);
r += n;
}
j += n;
}
return(true);
}
private unsafe void ReadFlacRiceBlock(FlacBitReader reader, int nvals, int riceParameter, int *ptrDest)
{
fixed(byte *putable = FlacBitReader.UnaryTable)
{
uint mask = (1u << riceParameter) - 1;
if (riceParameter == 0)
{
for (int i = 0; i < nvals; i++)
{
*(ptrDest++) = reader.ReadUnarySigned();
}
}
else
{
for (int i = 0; i < nvals; i++)
{
uint bits = putable[reader.Cache >> 24];
uint msbs = bits;
while (bits == 8)
{
reader.SeekBits(8);
bits = putable[reader.Cache >> 24];
msbs += bits;
}
uint uval = 0;
if (riceParameter <= 16)
{
int btsk = riceParameter + (int)bits + 1;
uval = (msbs << riceParameter) | ((reader.Cache >> (32 - btsk)) & mask);
reader.SeekBits(btsk);
}
else
{
reader.SeekBits((int)(msbs & 7) + 1);
uval = (msbs << riceParameter) | ((reader.Cache >> (32 - riceParameter)));
reader.SeekBits(riceParameter);
}
*(ptrDest++) = (int)(uval >> 1 ^ -(int)(uval & 1));
}
}
}
}
private unsafe void ReadFlacRiceBlock(FlacBitReader reader, int nvals, int riceParameter, int* ptrDest)
{
fixed (byte* putable = FlacBitReader.UnaryTable)
{
uint mask = (1u << riceParameter) - 1;
if (riceParameter == 0)
{
for (int i = 0; i < nvals; i++)
{
*(ptrDest++) = reader.ReadUnarySigned();
}
}
else
{
for (int i = 0; i < nvals; i++)
{
uint bits = putable[reader.Cache >> 24];
uint msbs = bits;
while (bits == 8)
{
reader.SeekBits(8);
bits = putable[reader.Cache >> 24];
msbs += bits;
}
uint uval = 0;
if (riceParameter <= 16)
{
int btsk = riceParameter + (int)bits + 1;
uval = (msbs << riceParameter) | ((reader.Cache >> (32 - btsk)) & mask);
reader.SeekBits(btsk);
}
else
{
reader.SeekBits((int)(msbs & 7) + 1);
uval = (msbs << riceParameter) | ((reader.Cache >> (32 - riceParameter)));
reader.SeekBits(riceParameter);
}
*(ptrDest++) = (int)(uval >> 1 ^ -(int)(uval & 1));
}
}
}
}
public unsafe bool ProcessResidual(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int order)
{
data.Content.UpdateSize(PartitionOrder);
int porder = PartitionOrder;
FlacEntropyCoding codingMethod = CodingMethod;
int psize = header.BlockSize >> porder;
int resCnt = psize - order;
int ricelength = 4 + (int)codingMethod; //4bit = RICE I | 5bit = RICE II
//residual
int j = order;
int* r = data.ResidualBuffer + j;
int partitioncount = 1 << porder;
for (int p = 0; p < partitioncount; p++)
{
if (p == 1) resCnt = psize;
int n = Math.Min(resCnt, header.BlockSize - j);
int k = Content.Parameters[p] = (int)reader.ReadBits(ricelength);
if (k == (1 << ricelength) - 1)
{
k = (int)reader.ReadBits(5);
for (int i = n; i > 0; i--)
{
*(r) = reader.ReadBitsSigned((int)k);
}
}
else
{
ReadFlacRiceBlock(reader, n, (int)k, r);
r += n;
}
j += n;
}
return true;
}
private unsafe bool ParseHeader(ref byte *headerBuffer, FlacMetadataStreamInfo streamInfo)
{
const string loggerLocation = "FlacFrameHeader.ParseHeader(byte*, FlacMetadataStreamInfo)";
int x = -1; //tmp value to store in
if (headerBuffer[0] == 0xFF && headerBuffer[1] >> 1 == 0x7C) //sync bits
{
if ((headerBuffer[1] & 0x02) != 0) // ...10 2. letzes bits muss 0 sein
{
Error("Invalid FlacFrame. Reservedbit_0 is 1", loggerLocation);
return(false);
}
byte * __headerbufferPtr = headerBuffer;
FlacBitReader reader = new FlacBitReader(__headerbufferPtr, 0);
#region blocksize
//blocksize
x = headerBuffer[2] >> 4;
int blocksize = -1;
if (x == 0)
{
Error("Invalid Blocksize value: 0", loggerLocation);
return(false);
}
else if (x == 1)
{
blocksize = 192;
}
else if (x >= 2 && x <= 5)
{
blocksize = 576 << (x - 2);
}
else if (x == 6 || x == 7)
{
_blocksizeHint = x;
}
else if (x >= 8 && x <= 15)
{
blocksize = 256 << (x - 8);
}
else
{
Error("Invalid Blocksize value: " + x, loggerLocation);
return(false);
}
BlockSize = blocksize;
#endregion blocksize
#region samplerate
//samplerate
x = headerBuffer[2] & 0x0F;
int sampleRate = -1;
if (x == 0)
{
if (streamInfo != null)
{
sampleRate = streamInfo.SampleRate;
}
else
{
Error("Missing Samplerate. Samplerate Index = 0 && streamInfoMetaData == null.", loggerLocation);
return(false);
}
}
else if (x >= 1 && x <= 11)
{
sampleRate = FlacConstant.SampleRateTable[x];
}
else if (x >= 12 && x <= 14)
{
_sampleRateHint = x;
}
else
{
Error("Invalid SampleRate value: " + x, loggerLocation);
return(false);
}
SampleRate = sampleRate;
#endregion samplerate
#region channels
x = headerBuffer[3] >> 4; //cc: unsigned
int channels = -1;
if ((x & 8) != 0)
{
channels = 2;
if ((x & 7) > 2 || (x & 7) < 0)
{
Error("Invalid ChannelAssignment", loggerLocation);
return(false);
}
else
{
ChannelAssignment = (ChannelAssignment)((x & 7) + 1);
}
}
else
{
channels = x + 1;
ChannelAssignment = ChannelAssignment.Independent;
}
Channels = channels;
#endregion channels
#region bitspersample
x = (headerBuffer[3] & 0x0E) >> 1;
int bitsPerSample = -1;
if (x == 0)
{
if (streamInfo != null)
{
bitsPerSample = streamInfo.BitsPerSample;
}
else
{
Error("Missing BitsPerSample. Index = 0 && streamInfoMetaData == null.", loggerLocation);
return(false);
}
}
else if (x == 3 || x >= 7 || x < 0)
{
Error("Invalid BitsPerSampleIndex", loggerLocation);
return(false);
}
else
{
bitsPerSample = FlacConstant.BitPerSampleTable[x];
}
BitsPerSample = bitsPerSample;
#endregion bitspersample
if ((headerBuffer[3] & 0x01) != 0) // reserved bit -> 0
{
Error("Invalid FlacFrame. Reservedbit_1 is 1", loggerLocation);
return(false);
}
//reader.SkipBits(4 * 8); //erste 3 bytes headerbytes überspringen, da diese schon ohne reader verarbeitet
reader.ReadBits(32);
//BYTE 4
#region utf8
//variable blocksize
if ((headerBuffer[1] & 0x01) != 0 ||
(streamInfo != null && streamInfo.MinBlockSize != streamInfo.MaxBlockSize))
{
ulong samplenumber;
if (reader.ReadUTF8_64(out samplenumber) && samplenumber != ulong.MaxValue)
{
NumberType = FlacNumberType.SampleNumber;
SampleNumber = samplenumber;
}
else
{
Error("Invalid UTF8 Samplenumber coding.", loggerLocation);
return(false);
}
}
else //fixed blocksize
{
uint framenumber;// = reader.ReadUTF8();
if (reader.ReadUTF8_32(out framenumber) && framenumber != uint.MaxValue)
{
NumberType = FlacNumberType.FrameNumber;
FrameNumber = framenumber;
}
else
{
Error("Invalid UTF8 Framenumber coding.", loggerLocation);
return(false);
}
}
#endregion utf8
#region read hints
//blocksize am ende des frameheaders
if (_blocksizeHint != 0)
{
x = (int)reader.ReadBits(8);
if (_blocksizeHint == 7)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
BlockSize = x + 1;
}
//samplerate am ende des frameheaders
if (_sampleRateHint != 0)
{
x = (int)reader.ReadBits(8);
if (_sampleRateHint != 12)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
if (_sampleRateHint == 12)
{
SampleRate = x * 1000;
}
else if (_sampleRateHint == 13)
{
SampleRate = x;
}
else
{
SampleRate = x * 10;
}
}
#endregion read hints
//if (Channels == 1 && BitsPerSample == 24 && SampleRate == 44100)
// System.Diagnostics.Debugger.Break();
if (DoCRC)
{
var crc8 = NAudio.Flac.CRC8.Instance.CalcCheckSum(reader.Buffer, 0, reader.Position);
CRC8 = (byte)reader.ReadBits(8);
if (CRC8 != crc8)
{
Error("CRC8 missmatch", loggerLocation);
return(false);
}
}
headerBuffer += reader.Position;
return(true);
}
Error("Invalid Syncbits", loggerLocation);
return(false);
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
int wastedBits = 0, order = 0;
uint x = reader.ReadBits(8);
bool hasWastedBits = (x & 1) != 0;
x &= 0xFE; //1111 1110
if (hasWastedBits)
{
int u = (int)reader.ReadUnary();
wastedBits = u + 1;
bps -= wastedBits;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return(null);
}
FlacSubFrameBase subFrame;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return(null);
}
if (x == 0)
{
subFrame = new FlacSubFrameConstant(reader, header, data, bps);
}
else if (x == 2)
{
//verbatim
subFrame = new FlacSubFrameVerbatim(reader, header, data, bps);
}
else if (x >= 16 && x <= 24)
{
//fixed
order = (int)((x >> 1) & 7);
subFrame = new FlacSubFrameFixed(reader, header, data, bps, order);
}
else if (x >= 64)
{
//lpc
order = (int)(((x >> 1) & 31) + 1);
subFrame = new FlacSubFrameLPC(reader, header, data, bps, order);
}
else
{
Debug.WriteLine("Invalid Flac-SubframeType: x = " + x + ".");
return(null);
}
if (hasWastedBits)
{
int *ptrDest = data.DestBuffer;
for (int i = 0; i < header.BlockSize; i++)
{
*(ptrDest++) <<= wastedBits;
}
}
//System.Diagnostics.Debug.WriteLine(subFrame.GetType().Name);
//check null removed
subFrame.WastedBits = wastedBits;
return(subFrame);
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
int wastedBits = 0, order = 0;
uint x = reader.ReadBits(8);
bool hasWastedBits = (x & 1) != 0;
x &= 0xFE; //1111 1110
if (hasWastedBits)
{
int u = (int)reader.ReadUnary();
wastedBits = u + 1;
bps -= wastedBits;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return null;
}
FlacSubFrameBase subFrame;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return null;
}
if (x == 0)
{
subFrame = new FlacSubFrameConstant(reader, header, data, bps);
}
else if (x == 2)
{
//verbatim
subFrame = new FlacSubFrameVerbatim(reader, header, data, bps);
}
else if (x >= 16 && x <= 24)
{
//fixed
order = (int)((x >> 1) & 7);
subFrame = new FlacSubFrameFixed(reader, header, data, bps, order);
}
else if (x >= 64)
{
//lpc
order = (int)(((x >> 1) & 31) + 1);
subFrame = new FlacSubFrameLPC(reader, header, data, bps, order);
}
else
{
Debug.WriteLine("Invalid Flac-SubframeType: x = " + x + ".");
return null;
}
if (hasWastedBits)
{
int* ptrDest = data.DestBuffer;
for (int i = 0; i < header.BlockSize; i++)
{
*(ptrDest++) <<= wastedBits;
}
}
//System.Diagnostics.Debug.WriteLine(subFrame.GetType().Name);
//check null removed
subFrame.WastedBits = wastedBits;
return subFrame;
}
private unsafe bool ParseHeader(ref byte* headerBuffer, FlacMetadataStreamInfo streamInfo)
{
const string loggerLocation = "FlacFrameHeader.ParseHeader(byte*, FlacMetadataStreamInfo)";
int x = -1; //tmp value to store in
if (headerBuffer[0] == 0xFF && headerBuffer[1] >> 1 == 0x7C) //sync bits
{
if ((headerBuffer[1] & 0x02) != 0) // ...10 2. letzes bits muss 0 sein
{
Error("Invalid FlacFrame. Reservedbit_0 is 1", loggerLocation);
return false;
}
byte* __headerbufferPtr = headerBuffer;
FlacBitReader reader = new FlacBitReader(__headerbufferPtr, 0);
#region blocksize
//blocksize
x = headerBuffer[2] >> 4;
int blocksize = -1;
if (x == 0)
{
Error("Invalid Blocksize value: 0", loggerLocation);
return false;
}
else if (x == 1)
blocksize = 192;
else if (x >= 2 && x <= 5)
blocksize = 576 << (x - 2);
else if (x == 6 || x == 7)
_blocksizeHint = x;
else if (x >= 8 && x <= 15)
blocksize = 256 << (x - 8);
else
{
Error("Invalid Blocksize value: " + x, loggerLocation);
return false;
}
BlockSize = blocksize;
#endregion blocksize
#region samplerate
//samplerate
x = headerBuffer[2] & 0x0F;
int sampleRate = -1;
if (x == 0)
{
if (streamInfo != null)
sampleRate = streamInfo.SampleRate;
else
{
Error("Missing Samplerate. Samplerate Index = 0 && streamInfoMetaData == null.", loggerLocation);
return false;
}
}
else if (x >= 1 && x <= 11)
sampleRate = FlacConstant.SampleRateTable[x];
else if (x >= 12 && x <= 14)
_sampleRateHint = x;
else
{
Error("Invalid SampleRate value: " + x, loggerLocation);
return false;
}
SampleRate = sampleRate;
#endregion samplerate
#region channels
x = headerBuffer[3] >> 4; //cc: unsigned
int channels = -1;
if ((x & 8) != 0)
{
channels = 2;
if ((x & 7) > 2 || (x & 7) < 0)
{
Error("Invalid ChannelAssignment", loggerLocation);
return false;
}
else
ChannelAssignment = (ChannelAssignment)((x & 7) + 1);
}
else
{
channels = x + 1;
ChannelAssignment = ChannelAssignment.Independent;
}
Channels = channels;
#endregion channels
#region bitspersample
x = (headerBuffer[3] & 0x0E) >> 1;
int bitsPerSample = -1;
if (x == 0)
{
if (streamInfo != null)
bitsPerSample = streamInfo.BitsPerSample;
else
{
Error("Missing BitsPerSample. Index = 0 && streamInfoMetaData == null.", loggerLocation);
return false;
}
}
else if (x == 3 || x >= 7 || x < 0)
{
Error("Invalid BitsPerSampleIndex", loggerLocation);
return false;
}
else
bitsPerSample = FlacConstant.BitPerSampleTable[x];
BitsPerSample = bitsPerSample;
#endregion bitspersample
if ((headerBuffer[3] & 0x01) != 0) // reserved bit -> 0
{
Error("Invalid FlacFrame. Reservedbit_1 is 1", loggerLocation);
return false;
}
//reader.SkipBits(4 * 8); //erste 3 bytes headerbytes überspringen, da diese schon ohne reader verarbeitet
reader.ReadBits(32);
//BYTE 4
#region utf8
//variable blocksize
if ((headerBuffer[1] & 0x01) != 0 ||
(streamInfo != null && streamInfo.MinBlockSize != streamInfo.MaxBlockSize))
{
ulong samplenumber;
if (reader.ReadUTF8_64(out samplenumber) && samplenumber != ulong.MaxValue)
{
NumberType = FlacNumberType.SampleNumber;
SampleNumber = samplenumber;
}
else
{
Error("Invalid UTF8 Samplenumber coding.", loggerLocation);
return false;
}
}
else //fixed blocksize
{
uint framenumber;// = reader.ReadUTF8();
if (reader.ReadUTF8_32(out framenumber) && framenumber != uint.MaxValue)
{
NumberType = FlacNumberType.FrameNumber;
FrameNumber = framenumber;
}
else
{
Error("Invalid UTF8 Framenumber coding.", loggerLocation);
return false;
}
}
#endregion utf8
#region read hints
//blocksize am ende des frameheaders
if (_blocksizeHint != 0)
{
x = (int)reader.ReadBits(8);
if (_blocksizeHint == 7)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
BlockSize = x + 1;
}
//samplerate am ende des frameheaders
if (_sampleRateHint != 0)
{
x = (int)reader.ReadBits(8);
if (_sampleRateHint != 12)
{
x = (x << 8) | (int)reader.ReadBits(8);
}
if (_sampleRateHint == 12)
SampleRate = x * 1000;
else if (_sampleRateHint == 13)
SampleRate = x;
else
SampleRate = x * 10;
}
#endregion read hints
//if (Channels == 1 && BitsPerSample == 24 && SampleRate == 44100)
// System.Diagnostics.Debugger.Break();
if (DoCRC)
{
var crc8 = NAudio.Flac.CRC8.Instance.CalcCheckSum(reader.Buffer, 0, reader.Position);
CRC8 = (byte)reader.ReadBits(8);
if (CRC8 != crc8)
{
Error("CRC8 missmatch", loggerLocation);
return false;
}
}
headerBuffer += reader.Position;
return true;
}
Error("Invalid Syncbits", loggerLocation);
return false;
}
private unsafe void ReadSubFrames()
{
List<FlacSubFrameBase> subFrames = new List<FlacSubFrameBase>();
//alocateOutput
var data = AllocOuputMemory();
_data = data;
byte[] buffer = new byte[0x20000];
if ((_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) > buffer.Length)
{
buffer = new byte[(_streamInfo.MaxFrameSize * Header.Channels * Header.BitsPerSample * 2 >> 3) - FlacConstant.FrameHeaderSize];
}
int read = _stream.Read(buffer, 0, (int)Math.Min(buffer.Length, _stream.Length - _stream.Position));
fixed (byte* ptrBuffer = buffer)
{
FlacBitReader reader = new FlacBitReader(ptrBuffer, 0);
for (int c = 0; c < Header.Channels; c++)
{
int bps = Header.BitsPerSample;
if (Header.ChannelAssignment == ChannelAssignment.MidSide || Header.ChannelAssignment == ChannelAssignment.LeftSide)
bps += c;
else if (Header.ChannelAssignment == ChannelAssignment.RightSide)
bps += 1 - c;
var subframe = FlacSubFrameBase.GetSubFrame(reader, data[c], Header, bps);
subFrames.Add(subframe);
}
reader.Flush();
Crc16 = (ushort)reader.ReadBits(16);
_stream.Position -= read - reader.Position;
SamplesToBytes(_data);
//return reader.Position;
}
}
public unsafe FlacSubFrameLPC(FlacBitReader reader, FlacFrameHeader header, FlacSubFrameData data, int bps, int order)
: base(header)
{
//warmup
_warmup = new int[FlacConstant.MaxLpcOrder];
for (int i = 0; i < order; i++)
{
_warmup[i] = data.ResidualBuffer[i] = reader.ReadBitsSigned(bps);
}
//header
int u32 = (int)reader.ReadBits(FlacConstant.SubframeLpcQlpCoeffPrecisionLen);
if (u32 == (1 << FlacConstant.SubframeLpcQlpCoeffPrecisionLen) - 1)
{
Debug.WriteLine("Invalid FlacLPC qlp coeff precision.");
return; //return false;
}
_qlpCoeffPrecision = u32 + 1;
int level = reader.ReadBitsSigned(FlacConstant.SubframeLpcQlpShiftLen);
if (level < 0)
{
throw new Exception("negative shift");
}
_lpcShiftNeeded = level;
_qlpCoeffs = new int[FlacConstant.MaxLpcOrder];
//qlp coeffs
for (int i = 0; i < order; i++)
{
_qlpCoeffs[i] = reader.ReadBitsSigned(_qlpCoeffPrecision);
}
Residual = new FlacResidual(reader, header, data, order);
for (int i = 0; i < order; i++)
{
data.DestBuffer[i] = data.ResidualBuffer[i];
}
int i1 = order;
int result = 0;
while ((i1 >>= 1) != 0)
{
result++;
}
if (bps + _qlpCoeffPrecision + result <= 32)
{
if (bps <= 16 && _qlpCoeffPrecision <= 16)
{
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order); //Restore(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
else
{
RestoreLPCSignal(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);
}
}
else
{
RestoreLPCSignalWide(data.ResidualBuffer + order, data.DestBuffer + order, header.BlockSize - order, order);//RestoreWide(data.residualBuffer + order, data.destBuffer, Header.BlockSize - order, order, order);
}
}
