зеркало из https://github.com/mozilla/pjs.git
120 строки
4.9 KiB
C
120 строки
4.9 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 1994-2009 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function: basic shared codebook operations
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last mod: $Id: codebook.h 17030 2010-03-25 06:52:55Z xiphmont $
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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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long *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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/* for decode, the below are ordered by bitreversed codeword and only
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used entries are 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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int *dec_index; /* only used if sparseness collapsed */
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char *dec_codelengths;
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ogg_uint32_t *dec_firsttable;
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int dec_firsttablen;
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int dec_maxlength;
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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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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(codebook *dest,const static_codebook *source);
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extern void vorbis_book_clear(codebook *b);
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extern float *_book_unquantize(const static_codebook *b,int n,int *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 int _ilog(unsigned int v);
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extern long _book_maptype1_quantvals(const static_codebook *b);
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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 static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b);
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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(codebook *book, oggpack_buffer *b);
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extern long vorbis_book_decodevs_add(codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodev_set(codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodev_add(codebook *book, float *a,
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oggpack_buffer *b,int n);
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extern long vorbis_book_decodevv_add(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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