1 /******************************************************************** 2 * * 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * 7 * * 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 * 9 * by the Xiph.Org Foundation http://www.xiph.org/ * 10 * * 11 ******************************************************************** 12 13 function: basic shared codebook operations 14 last mod: $Id: codebook.h 17030 2010-03-25 06:52:55Z xiphmont $ 15 16 ********************************************************************/ 17 18 #ifndef _V_CODEBOOK_H_ 19 #define _V_CODEBOOK_H_ 20 21 #include <ogg/ogg.h> 22 23 /* This structure encapsulates huffman and VQ style encoding books; it 24 doesn't do anything specific to either. 25 26 valuelist/quantlist are nonNULL (and q_* significant) only if 27 there's entry->value mapping to be done. 28 29 If encode-side mapping must be done (and thus the entry needs to be 30 hunted), the auxiliary encode pointer will point to a decision 31 tree. This is true of both VQ and huffman, but is mostly useful 32 with VQ. 33 34 */ 35 36 typedef struct static_codebook{ 37 long dim; /* codebook dimensions (elements per vector) */ 38 long entries; /* codebook entries */ 39 long *lengthlist; /* codeword lengths in bits */ 40 41 /* mapping ***************************************************************/ 42 int maptype; /* 0=none 43 1=implicitly populated values from map column 44 2=listed arbitrary values */ 45 46 /* The below does a linear, single monotonic sequence mapping. */ 47 long q_min; /* packed 32 bit float; quant value 0 maps to minval */ 48 long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ 49 int q_quant; /* bits: 0 < quant <= 16 */ 50 int q_sequencep; /* bitflag */ 51 52 long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map 53 map == 2: list of dim*entries quantized entry vals 54 */ 55 int allocedp; 56 } static_codebook; 57 58 typedef struct codebook{ 59 long dim; /* codebook dimensions (elements per vector) */ 60 long entries; /* codebook entries */ 61 long used_entries; /* populated codebook entries */ 62 const static_codebook *c; 63 64 /* for encode, the below are entry-ordered, fully populated */ 65 /* for decode, the below are ordered by bitreversed codeword and only 66 used entries are populated */ 67 float *valuelist; /* list of dim*entries actual entry values */ 68 ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ 69 70 int *dec_index; /* only used if sparseness collapsed */ 71 char *dec_codelengths; 72 ogg_uint32_t *dec_firsttable; 73 int dec_firsttablen; 74 int dec_maxlength; 75 76 /* The current encoder uses only centered, integer-only lattice books. */ 77 int quantvals; 78 int minval; 79 int delta; 80 } codebook; 81 82 extern void vorbis_staticbook_destroy(static_codebook *b); 83 extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source); 84 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); 85 extern void vorbis_book_clear(codebook *b); 86 87 extern float *_book_unquantize(const static_codebook *b,int n,int *map); 88 extern float *_book_logdist(const static_codebook *b,float *vals); 89 extern float _float32_unpack(long val); 90 extern long _float32_pack(float val); 91 extern int _best(codebook *book, float *a, int step); 92 extern int _ilog(unsigned int v); 93 extern long _book_maptype1_quantvals(const static_codebook *b); 94 95 extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul); 96 extern long vorbis_book_codeword(codebook *book,int entry); 97 extern long vorbis_book_codelen(codebook *book,int entry); 98 99 100 101 extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b); 102 extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); 103 104 extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b); 105 106 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); 107 extern long vorbis_book_decodevs_add(codebook *book, float *a, 108 oggpack_buffer *b,int n); 109 extern long vorbis_book_decodev_set(codebook *book, float *a, 110 oggpack_buffer *b,int n); 111 extern long vorbis_book_decodev_add(codebook *book, float *a, 112 oggpack_buffer *b,int n); 113 extern long vorbis_book_decodevv_add(codebook *book, float **a, 114 long off,int ch, 115 oggpack_buffer *b,int n); 116 117 118 119 #endif 120
