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Codec Namespace Reference

Simply supports a decoding variety of sample encodings. More...

Compounds
class	Codec::ALawDecoder
class	Codec::Codex
class	Codec::FibonacciDecoder
class	Codec::MuLawDecoder
Functions
bool	DecodeMuLaw (const unsigned char* src, signed short*& dest, unsigned long length)
bool	DecodeALaw (const unsigned char* src, signed short*& dest, unsigned long length)
bool	DecodeFibonacciDPCM (const unsigned char* src, unsigned char*& dest, unsigned long length)
bool	DecodeExponentialDPCM (const unsigned char* src, unsigned char*& dest, unsigned long length)
long	DecodeAdpcmSample (unsigned char adpcm, long& previous, int step_table_index)
	Decode Adaptive Differential Pulse Code Modulation. More...
unsigned char	EncodeAdpcmSample (unsigned char sample, long& previous, int& step_table_index)
bool	DecodeIT8bitSamples (const unsigned char* src, unsigned long srclen, unsigned char*& dest, unsigned long destlen, bool it215=false)
bool	DecodeIT16bitSamples (const short* src, short*& dest, unsigned long length)
unsigned long	Convert32 (unsigned long x)
unsigned short	Convert16 (unsigned short x)
unsigned short	LE16 (unsigned short x)
	Convert an unsigned short to little endian.
unsigned long	LE32 (unsigned long x)
	Convert an unsigned long to little endian.
unsigned short	BE16 (unsigned short x)
	Convert an unsigned short to big endian.
unsigned long	BE32 (unsigned long x)
	Convert an unsigned long to big endian.
unsigned short	Little (unsigned short& x)
signed short	Little (signed short& x)
unsigned long	Little (unsigned long& x)
signed long	Little (signed long& x)
unsigned short	Big (unsigned short& x)
signed short	Big (signed short& x)
unsigned long	Big (unsigned long& x)
signed long	Big (signed long& x)

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Detailed Description

Simply supports a decoding variety of sample encodings.

It also has some code for dealing with endianism.

Convert these to functors? -- Problem: some encodings encode from/to 4 bit values. This doesn't quite gel with functors.

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Function Documentation

long Codec::DecodeAdpcmSample ( unsigned char adpcm, long & previous, int step_table_index )

Decode Adaptive Differential Pulse Code Modulation. Compressed Samples are stored in four bits. Take the value of the stored sample, multiply it by the current step size and add it to the previous sample and you have the uncompressed value of the sample. The delta is the difference between the last sample and the current one. The step size is not stored directly instead 88 possible values are stored in a table.

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