public static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header,
int bitsPerSample)
{
unchecked
{
int wastedBits = 0, order;
var firstByte = reader.ReadBits(8);
if ((firstByte & 0x80) != 0) //Zero bit padding, to prevent sync-fooling string of 1s
{
Debug.WriteLine("Flacdecoder subframe-header got no zero-bit padding.");
return(null);
}
var hasWastedBits = (firstByte & 1) != 0; //Wasted bits-per-sample' flag
if (hasWastedBits)
{
var k = (int)reader.ReadUnary();
wastedBits = k + 1; //"k-1" follows -> add 1
bitsPerSample -= wastedBits;
}
FlacSubFrameBase subFrame;
var subframeType = (firstByte & 0x7E) >> 1; //0111 1110
if (subframeType == 0) //000000
{
subFrame = new FlacSubFrameConstant(reader, header, data, bitsPerSample);
}
else if (subframeType == 1) //000001
{
subFrame = new FlacSubFrameVerbatim(reader, header, data, bitsPerSample);
}
else if ((subframeType & 0x20) != 0) //100000 = 0x20
{
order = (int)(subframeType & 0x1F) + 1;
subFrame = new FlacSubFrameLPC(reader, header, data, bitsPerSample, order);
}
else if ((subframeType & 0x08) != 0) //001000 = 0x08
{
order = (int)(subframeType & 0x07);
if (order > 4)
{
return(null);
}
subFrame = new FlacSubFrameFixed(reader, header, data, bitsPerSample, order);
}
else
{
Debug.WriteLine($"Invalid Flac-SubframeType. SubframeType: 0x{subframeType:x}.");
return(null);
}
if (hasWastedBits)
{
var destination = data.DestinationBuffer.Span;
for (var i = 0; i < header.BlockSize; i++)
{
destination[i] <<= wastedBits;
}
}
return(subFrame);
}
}
public static unsafe FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bitsPerSample)
{
int wastedBits = 0, order;
uint firstByte = reader.ReadBits(8);
if ((firstByte & 0x80) != 0) //Zero bit padding, to prevent sync-fooling string of 1s
{
Debug.WriteLine("Flacdecoder subframe-header got no zero-bit padding.");
return null;
}
bool hasWastedBits = (firstByte & 1) != 0; //Wasted bits-per-sample' flag
if (hasWastedBits)
{
int k = (int)reader.ReadUnary();
wastedBits = k + 1; //"k-1" follows -> add 1
bitsPerSample -= wastedBits;
}
FlacSubFrameBase subFrame;
var subframeType = (firstByte & 0x7E) >> 1; //0111 1110
if (subframeType == 0) //000000
{
subFrame = new FlacSubFrameConstant(reader, header, data, bitsPerSample);
}
else if (subframeType == 1) //000001
{
subFrame = new FlacSubFrameVerbatim(reader, header, data, bitsPerSample);
}
else if ((subframeType & 0x08) != 0) //001000 = 0x08
{
order = (int) (subframeType & 0x07);
subFrame = new FlacSubFrameFixed(reader, header, data, bitsPerSample, order);
}
else if ((subframeType & 0x20) != 0) //100000 = 0x20
{
order = (int) (subframeType & 0x1F) + 1;
subFrame = new FlacSubFrameLPC(reader, header, data, bitsPerSample, order);
}
else
{
Debug.WriteLine(String.Format("Invalid Flac-SubframeType. SubframeType: 0x{0:x}.", subframeType));
return null;
}
if (hasWastedBits)
{
int* destination = data.DestinationBuffer;
for (int i = 0; i < header.BlockSize; i++)
{
*(destination++) <<= wastedBits;
}
}
#if FLAC_DEBUG
subFrame.WastedBits = wastedBits;
#endif
return subFrame;
}
public static unsafe FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
uint x;
int wastedBits = 0, totalBits = 0, order = 0;
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;
totalBits = bps;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return null;
}
FlacSubFrameBase subFrame = null;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return null;
}
else 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);
if (subFrame != null)
subFrame.WastedBits = wastedBits;
else
Debug.WriteLine("Unknown error while reading FlacSubFrameHeader");
return subFrame;
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bitsPerSample)
{
int wastedBits = 0, order;
uint firstByte = reader.ReadBits(8);
if ((firstByte & 0x80) != 0) //Zero bit padding, to prevent sync-fooling string of 1s
{
Debug.WriteLine("Flacdecoder subframe-header got no zero-bit padding.");
return(null);
}
bool hasWastedBits = (firstByte & 1) != 0; //Wasted bits-per-sample' flag
if (hasWastedBits)
{
int k = (int)reader.ReadUnary();
wastedBits = k + 1; //"k-1" follows -> add 1
bitsPerSample -= wastedBits;
}
FlacSubFrameBase subFrame;
var subframeType = (firstByte & 0x7E) >> 1; //0111 1110
if (subframeType == 0) //000000
{
subFrame = new FlacSubFrameConstant(reader, header, data, bitsPerSample);
}
else if (subframeType == 1) //000001
{
subFrame = new FlacSubFrameVerbatim(reader, header, data, bitsPerSample);
}
else if ((subframeType & 0x08) != 0) //001000 = 0x08
{
order = (int)(subframeType & 0x07);
subFrame = new FlacSubFrameFixed(reader, header, data, bitsPerSample, order);
}
else if ((subframeType & 0x20) != 0) //100000 = 0x20
{
order = (int)(subframeType & 0x1F) + 1;
subFrame = new FlacSubFrameLPC(reader, header, data, bitsPerSample, order);
}
else
{
Debug.WriteLine(String.Format("Invalid Flac-SubframeType. SubframeType: 0x{0:x}.", subframeType));
return(null);
}
if (hasWastedBits)
{
int *destination = data.DestinationBuffer;
for (int i = 0; i < header.BlockSize; i++)
{
*(destination++) <<= wastedBits;
}
}
#if FLAC_DEBUG
subFrame.WastedBits = wastedBits;
#endif
return(subFrame);
}
public unsafe static FlacSubFrameBase GetSubFrame(FlacBitReader reader, FlacSubFrameData data, FlacFrameHeader header, int bps)
{
uint x;
int wastedBits = 0, totalBits = 0, order = 0;
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;
totalBits = bps;
}
if ((x & 0x80) != 0)
{
Debug.WriteLine("Flacdecoder lost sync while reading FlacSubFrameHeader. [x & 0x80].");
return(null);
}
FlacSubFrameBase subFrame = null;
if ((x > 2 && x < 16) ||
(x > 24 && x < 64))
{
Debug.WriteLine("Invalid FlacSubFrameHeader. [" + x.ToString("x") + "]");
return(null);
}
else 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);
if (subFrame != null)
{
subFrame.WastedBits = wastedBits;
}
else
{
Debug.WriteLine("Unknown error while reading FlacSubFrameHeader");
}
return(subFrame);
}