ref: 2d221e61e3820a007ff2204adb73ad3ab27010c6
dir: /sys/src/cmd/audio/libvorbis/codebook.h/
/******************************************************************** * * * THIS FILE IS PART OF THE OggVorbis SOFTWARE 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 SOURCE CODE IS (C) COPYRIGHT 1994-2015 * * by the Xiph.Org Foundation http://www.xiph.org/ * * * ******************************************************************** function: basic shared codebook operations last mod: $Id: codebook.h 19457 2015-03-03 00:15:29Z giles $ ********************************************************************/ #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 */ char *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 */ int allocedp; } static_codebook; typedef struct codebook{ long dim; /* codebook dimensions (elements per vector) */ long entries; /* codebook entries */ long used_entries; /* populated codebook entries */ const static_codebook *c; /* for encode, the below are entry-ordered, fully populated */ /* for decode, the below are ordered by bitreversed codeword and only used entries are populated */ float *valuelist; /* list of dim*entries actual entry values */ ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ int *dec_index; /* only used if sparseness collapsed */ char *dec_codelengths; ogg_uint32_t *dec_firsttable; int dec_firsttablen; int dec_maxlength; /* The current encoder uses only centered, integer-only lattice books. */ int quantvals; int minval; int delta; } codebook; extern void vorbis_staticbook_destroy(static_codebook *b); extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source); extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); extern void vorbis_book_clear(codebook *b); extern float *_book_unquantize(const static_codebook *b,int n,int *map); extern float *_book_logdist(const static_codebook *b,float *vals); extern float _float32_unpack(long val); extern long _float32_pack(float val); extern int _best(codebook *book, float *a, int step); extern long _book_maptype1_quantvals(const static_codebook *b); extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul); extern long vorbis_book_codeword(codebook *book,int entry); extern long vorbis_book_codelen(codebook *book,int entry); extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b); extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b); extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); extern long vorbis_book_decodevs_add(codebook *book, float *a, oggpack_buffer *b,int n); extern long vorbis_book_decodev_set(codebook *book, float *a, oggpack_buffer *b,int n); extern long vorbis_book_decodev_add(codebook *book, float *a, oggpack_buffer *b,int n); extern long vorbis_book_decodevv_add(codebook *book, float **a, long off,int ch, oggpack_buffer *b,int n); #endif