| 1 | /********************************************************************
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| 2 | * *
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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| 7 | * *
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
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| 9 | * by the Xiph.Org Foundation https://xiph.org/ *
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| 10 | * *
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| 11 | ********************************************************************
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| 12 |
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| 13 | function: basic shared codebook operations
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| 14 |
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| 15 | ********************************************************************/
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| 16 |
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| 17 | #ifndef _V_CODEBOOK_H_
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| 18 | #define _V_CODEBOOK_H_
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| 19 |
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| 20 | #include <ogg/ogg.h>
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| 21 |
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| 22 | /* This structure encapsulates huffman and VQ style encoding books; it
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| 23 | doesn't do anything specific to either.
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| 24 |
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| 25 | valuelist/quantlist are nonNULL (and q_* significant) only if
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| 26 | there's entry->value mapping to be done.
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| 27 |
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| 28 | If encode-side mapping must be done (and thus the entry needs to be
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| 29 | hunted), the auxiliary encode pointer will point to a decision
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| 30 | tree. This is true of both VQ and huffman, but is mostly useful
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| 31 | with VQ.
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| 32 |
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| 33 | */
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| 34 |
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| 35 | typedef struct static_codebook{
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| 36 | long dim; /* codebook dimensions (elements per vector) */
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| 37 | long entries; /* codebook entries */
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| 38 | char *lengthlist; /* codeword lengths in bits */
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| 39 |
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| 40 | /* mapping ***************************************************************/
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| 41 | int maptype; /* 0=none
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| 42 | 1=implicitly populated values from map column
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| 43 | 2=listed arbitrary values */
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| 44 |
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| 45 | /* The below does a linear, single monotonic sequence mapping. */
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| 46 | long q_min; /* packed 32 bit float; quant value 0 maps to minval */
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| 47 | long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */
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| 48 | int q_quant; /* bits: 0 < quant <= 16 */
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| 49 | int q_sequencep; /* bitflag */
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| 50 |
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| 51 | long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map
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| 52 | map == 2: list of dim*entries quantized entry vals
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| 53 | */
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| 54 | int allocedp;
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| 55 | } static_codebook;
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| 56 |
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| 57 | typedef struct codebook{
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| 58 | long dim; /* codebook dimensions (elements per vector) */
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| 59 | long entries; /* codebook entries */
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| 60 | long used_entries; /* populated codebook entries */
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| 61 | const static_codebook *c;
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| 62 |
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| 63 | /* for encode, the below are entry-ordered, fully populated */
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| 64 | /* for decode, the below are ordered by bitreversed codeword and only
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| 65 | used entries are populated */
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| 66 | float *valuelist; /* list of dim*entries actual entry values */
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| 67 | ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */
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| 68 |
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| 69 | int *dec_index; /* only used if sparseness collapsed */
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| 70 | char *dec_codelengths;
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| 71 | ogg_uint32_t *dec_firsttable;
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| 72 | int dec_firsttablen;
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| 73 | int dec_maxlength;
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| 74 |
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| 75 | /* The current encoder uses only centered, integer-only lattice books. */
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| 76 | int quantvals;
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| 77 | int minval;
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| 78 | int delta;
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| 79 | } codebook;
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| 80 |
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| 81 | extern void vorbis_staticbook_destroy(static_codebook *b);
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| 82 | extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);
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| 83 | extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
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| 84 | extern void vorbis_book_clear(codebook *b);
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| 85 |
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| 86 | extern float *_book_unquantize(const static_codebook *b,int n,int *map);
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| 87 | extern float *_book_logdist(const static_codebook *b,float *vals);
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| 88 | extern float _float32_unpack(long val);
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| 89 | extern long _float32_pack(float val);
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| 90 | extern int _best(codebook *book, float *a, int step);
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| 91 | extern long _book_maptype1_quantvals(const static_codebook *b);
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| 92 |
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| 93 | extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);
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| 94 | extern long vorbis_book_codeword(codebook *book,int entry);
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| 95 | extern long vorbis_book_codelen(codebook *book,int entry);
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| 96 |
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| 97 |
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| 98 |
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| 99 | extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);
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| 100 | extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b);
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| 101 |
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| 102 | extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b);
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| 103 |
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| 104 | extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
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| 105 | extern long vorbis_book_decodevs_add(codebook *book, float *a,
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| 106 | oggpack_buffer *b,int n);
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| 107 | extern long vorbis_book_decodev_set(codebook *book, float *a,
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| 108 | oggpack_buffer *b,int n);
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| 109 | extern long vorbis_book_decodev_add(codebook *book, float *a,
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| 110 | oggpack_buffer *b,int n);
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| 111 | extern long vorbis_book_decodevv_add(codebook *book, float **a,
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| 112 | long off,int ch,
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| 113 | oggpack_buffer *b,int n);
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| 114 |
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| 115 |
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| 116 |
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| 117 | #endif
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