151 lines
6.7 KiB
C
151 lines
6.7 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
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* by the Xiph.Org Foundation https://xiph.org/ *
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* *
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********************************************************************
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function: basic shared codebook operations
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********************************************************************/
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#ifndef _V_CODEBOOK_H_
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#define _V_CODEBOOK_H_
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#include <ogg/ogg.h>
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/* This structure encapsulates huffman and VQ style encoding books; it
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doesn't do anything specific to either.
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valuelist/quantlist are nonNULL (and q_* significant) only if
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there's entry->value mapping to be done.
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If encode-side mapping must be done (and thus the entry needs to be
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hunted), the auxiliary encode pointer will point to a decision
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tree. This is true of both VQ and huffman, but is mostly useful
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with VQ.
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*/
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typedef struct static_codebook{
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long dim; /* codebook dimensions (elements per vector) */
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long entries; /* codebook entries */
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char *lengthlist; /* codeword lengths in bits */
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/* mapping ***************************************************************/
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int maptype; /* 0=none
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1=implicitly populated values from map column
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2=listed arbitrary values */
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/* The below does a linear, single monotonic sequence mapping. */
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long q_min; /* packed 32 bit float; quant value 0 maps to minval */
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long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */
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int q_quant; /* bits: 0 < quant <= 16 */
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int q_sequencep; /* bitflag */
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long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map
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map == 2: list of dim*entries quantized entry vals
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*/
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int allocedp;
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} static_codebook;
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typedef struct codebook{
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long dim; /* codebook dimensions (elements per vector) */
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long entries; /* codebook entries */
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long used_entries; /* populated codebook entries */
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const static_codebook *c;
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/* for encode, the below are entry-ordered, fully populated */
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float *valuelist; /* list of dim*entries actual entry values */
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ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */
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/* The current encoder uses only centered, integer-only lattice books. */
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int quantvals;
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int minval;
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int delta;
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} codebook;
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typedef struct dec_codebook{
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signed char dim; /* codebook dimensions (elements per vector) */
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signed char minlength;
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signed char maxlength;
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signed char firsttablen; /* number of bits in decode fastpath table */
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ogg_int32_t entries; /* codebook entries */
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ogg_int32_t hi_max; /* the maximum value of the fastpath hi hint */
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signed char hint_shift; /* the amount to shift the hints */
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/* The below does a linear, single monotonic sequence mapping. */
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signed char maptype;
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signed char q_quant; /* bits: 0 < quant <= 16 */
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signed char q_sequencep; /* bitflag */
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ogg_uint32_t q_min; /* packed 32 bit float;
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quant value 0 maps to minval */
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ogg_uint32_t q_delta; /* packed 32 bit float; val 1 - val 0 == delta */
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ogg_uint16_t *quantlist; /* map == 1:
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(int)(entries^(1/dim)) element column map
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map == 2:
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list of dim*entries quantized entry vals */
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ogg_uint32_t *firsttable; /* decode fastpath lookup table */
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/* the below are ordered by bitreversed codeword and only used entries are
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populated */
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ogg_uint32_t *codelist; /* unordered: list of codewords for each entry.
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ordered: sentinel value for each length as large
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as any codeword (of that length or shorter)
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with any trailing bits appended. */
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signed char *codelengths;/* unordered: length of each codeword.
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ordered: unused (NULL). */
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ogg_int32_t *index; /* unordered: a mapping from codeword index (in the
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collapsed, sorted list in codelist) to the entry
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in the original (possibly-sparse) codebook.
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ordered: cumulative count of entries for each
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length (starting from the minimum length). */
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float *valuelist; /* list of dim*entries actual entry values */
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} dec_codebook;
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extern void vorbis_staticbook_destroy(static_codebook *b);
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extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);
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extern int vorbis_book_init_decode(dec_codebook *c);
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extern void vorbis_book_clear(codebook *b);
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extern void vorbis_decbook_clear(dec_codebook *c);
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extern void _book_unquantize(float *r,const dec_codebook *b,int n,
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ogg_int64_t *map);
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extern float *_book_logdist(const static_codebook *b,float *vals);
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extern float _float32_unpack(long val);
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extern long _float32_pack(float val);
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extern int _best(codebook *book, float *a, int step);
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extern long _book_maptype1_quantvals(long dim, long entries);
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extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);
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extern long vorbis_book_codeword(codebook *book,int entry);
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extern long vorbis_book_codelen(codebook *book,int entry);
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extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);
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extern int vorbis_decbook_unpack(dec_codebook *c,oggpack_buffer *opb);
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extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b);
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extern long vorbis_book_decode(dec_codebook *book, oggpack_buffer *b);
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extern long vorbis_book_decodevs_add(dec_codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodev_set(dec_codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodev_add(dec_codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodevv_add(dec_codebook *book, float **a,
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long off,int ch,
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oggpack_buffer *b,int n);
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#endif
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