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comparison: media/libtremor/lib/codebook.h
media/libtremor/lib/codebook.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:1d8b97f10974 |
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| 1 /******************************************************************** | |
| 2 * * | |
| 3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * | |
| 4 * * | |
| 5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * | |
| 6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * | |
| 7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * | |
| 8 * * | |
| 9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * | |
| 10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * | |
| 11 * * | |
| 12 ******************************************************************** | |
| 13 | |
| 14 function: basic shared codebook operations | |
| 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 } static_codebook; | |
| 56 | |
| 57 typedef struct codebook{ | |
| 58 long dim; /* codebook dimensions (elements per vector) */ | |
| 59 long entries; /* codebook entries */ | |
| 60 long used_entries; /* populated codebook entries */ | |
| 61 | |
| 62 /* the below are ordered by bitreversed codeword and only used | |
| 63 entries are populated */ | |
| 64 int binarypoint; | |
| 65 ogg_int32_t *valuelist; /* list of dim*entries actual entry values */ | |
| 66 ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ | |
| 67 | |
| 68 int *dec_index; | |
| 69 char *dec_codelengths; | |
| 70 ogg_uint32_t *dec_firsttable; | |
| 71 int dec_firsttablen; | |
| 72 int dec_maxlength; | |
| 73 | |
| 74 long q_min; /* packed 32 bit float; quant value 0 maps to minval */ | |
| 75 long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ | |
| 76 | |
| 77 } codebook; | |
| 78 | |
| 79 extern void vorbis_staticbook_destroy(static_codebook *b); | |
| 80 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); | |
| 81 | |
| 82 extern void vorbis_book_clear(codebook *b); | |
| 83 extern long _book_maptype1_quantvals(const static_codebook *b); | |
| 84 | |
| 85 extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); | |
| 86 | |
| 87 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); | |
| 88 extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a, | |
| 89 oggpack_buffer *b,int n,int point); | |
| 90 extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a, | |
| 91 oggpack_buffer *b,int n,int point); | |
| 92 extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a, | |
| 93 oggpack_buffer *b,int n,int point); | |
| 94 extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a, | |
| 95 long off,int ch, | |
| 96 oggpack_buffer *b,int n,int point); | |
| 97 | |
| 98 extern int _ilog(unsigned int v); | |
| 99 | |
| 100 | |
| 101 #endif |
