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Diffstat (limited to 'lib/codebook.h')
| -rw-r--r-- | lib/codebook.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/codebook.h b/lib/codebook.h new file mode 100644 index 0000000..08440c6 --- /dev/null +++ b/lib/codebook.h @@ -0,0 +1,117 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 * + * by the Xiph.Org Foundation http://www.xiph.org/ * + * * + ******************************************************************** + + function: basic shared codebook operations + + ********************************************************************/ + +#ifndef _V_CODEBOOK_H_ +#define _V_CODEBOOK_H_ + +#include <ogg/ogg.h> + +/* This structure encapsulates huffman and VQ style encoding books; it + doesn't do anything specific to either. + + valuelist/quantlist are nonNULL (and q_* significant) only if + there's entry->value mapping to be done. + + If encode-side mapping must be done (and thus the entry needs to be + hunted), the auxiliary encode pointer will point to a decision + tree. This is true of both VQ and huffman, but is mostly useful + with VQ. + +*/ + +typedef struct static_codebook{ + long dim; /* codebook dimensions (elements per vector) */ + long entries; /* codebook entries */ + char *lengthlist; /* codeword lengths in bits */ + + /* mapping ***************************************************************/ + int maptype; /* 0=none + 1=implicitly populated values from map column + 2=listed arbitrary values */ + + /* The below does a linear, single monotonic sequence mapping. */ + long q_min; /* packed 32 bit float; quant value 0 maps to minval */ + long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ + int q_quant; /* bits: 0 < quant <= 16 */ + int q_sequencep; /* bitflag */ + + long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map + map == 2: list of dim*entries quantized entry vals + */ + int allocedp; +} static_codebook; + +typedef struct codebook{ + long dim; /* codebook dimensions (elements per vector) */ + long entries; /* codebook entries */ + long used_entries; /* populated codebook entries */ + const static_codebook *c; + + /* for encode, the below are entry-ordered, fully populated */ + /* for decode, the below are ordered by bitreversed codeword and only + used entries are populated */ + float *valuelist; /* list of dim*entries actual entry values */ + ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ + + int *dec_index; /* only used if sparseness collapsed */ + char *dec_codelengths; + ogg_uint32_t *dec_firsttable; + int dec_firsttablen; + int dec_maxlength; + + /* The current encoder uses only centered, integer-only lattice books. */ + int quantvals; + int minval; + int delta; +} codebook; + +extern void vorbis_staticbook_destroy(static_codebook *b); +extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source); +extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); +extern void vorbis_book_clear(codebook *b); + +extern float *_book_unquantize(const static_codebook *b,int n,int *map); +extern float *_book_logdist(const static_codebook *b,float *vals); +extern float _float32_unpack(long val); +extern long _float32_pack(float val); +extern int _best(codebook *book, float *a, int step); +extern long _book_maptype1_quantvals(const static_codebook *b); + +extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul); +extern long vorbis_book_codeword(codebook *book,int entry); +extern long vorbis_book_codelen(codebook *book,int entry); + + + +extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b); +extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b); + +extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b); + +extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); +extern long vorbis_book_decodevs_add(codebook *book, float *a, + oggpack_buffer *b,int n); +extern long vorbis_book_decodev_set(codebook *book, float *a, + oggpack_buffer *b,int n); +extern long vorbis_book_decodev_add(codebook *book, float *a, + oggpack_buffer *b,int n); +extern long vorbis_book_decodevv_add(codebook *book, float **a, + long off,int ch, + oggpack_buffer *b,int n); + + + +#endif |