/******************************************************************** * * * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * * * * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * * * * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * * * ******************************************************************** function: basic shared codebook operations ********************************************************************/ #ifndef _V_CODEBOOK_H_ #define _V_CODEBOOK_H_ #include <ogg/ogg.h> /* This structure encapsulates huffman and VQ style encoding books; it doesn't do anything specific to either. valuelist/quantlist are nonNULL (and q_* significant) only if there's entry->value mapping to be done. If encode-side mapping must be done (and thus the entry needs to be hunted), the auxiliary encode pointer will point to a decision tree. This is true of both VQ and huffman, but is mostly useful with VQ. */ typedef struct static_codebook{ long dim; /* codebook dimensions (elements per vector) */ long entries; /* codebook entries */ long *lengthlist; /* codeword lengths in bits */ /* mapping ***************************************************************/ int maptype; /* 0=none 1=implicitly populated values from map column 2=listed arbitrary values */ /* The below does a linear, single monotonic sequence mapping. */ long q_min; /* packed 32 bit float; quant value 0 maps to minval */ long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ int q_quant; /* bits: 0 < quant <= 16 */ int q_sequencep; /* bitflag */ long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map map == 2: list of dim*entries quantized entry vals */ } static_codebook; typedef struct codebook{ long dim; /* codebook dimensions (elements per vector) */ long entries; /* codebook entries */ long used_entries; /* populated codebook entries */ /* the below are ordered by bitreversed codeword and only used entries are populated */ int binarypoint; ogg_int32_t *valuelist; /* list of dim*entries actual entry values */ ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ int *dec_index; char *dec_codelengths; ogg_uint32_t *dec_firsttable; int dec_firsttablen; int dec_maxlength; long q_min; /* packed 32 bit float; quant value 0 maps to minval */ long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ } codebook; extern void vorbis_staticbook_destroy(static_codebook *b); extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); extern void vorbis_book_clear(codebook *b); extern long _book_maptype1_quantvals(const static_codebook *b); extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a, oggpack_buffer *b,int n,int point); extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a, oggpack_buffer *b,int n,int point); extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a, oggpack_buffer *b,int n,int point); extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a, long off,int ch, oggpack_buffer *b,int n,int point); extern int _ilog(unsigned int v); #endif