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comparison: media/libvorbis/lib/codebook.h
media/libvorbis/lib/codebook.h
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- TOR_BUG_9701
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| -1:000000000000 | 0:48bd14d285d8 |
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| 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 1994-2014 * | |
| 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 19057 2014-01-22 12:32:31Z 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 char *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 |
