cannam@86: /******************************************************************** cannam@86: * * cannam@86: * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * cannam@86: * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * cannam@86: * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * cannam@86: * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * cannam@86: * * cannam@86: * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * cannam@86: * by the Xiph.Org Foundation http://www.xiph.org/ * cannam@86: * * cannam@86: ******************************************************************** cannam@86: cannam@86: function: basic shared codebook operations cannam@86: last mod: $Id: localcodebook.h 16959 2010-03-10 16:03:11Z xiphmont $ cannam@86: cannam@86: ********************************************************************/ cannam@86: cannam@86: #ifndef _V_CODEBOOK_H_ cannam@86: #define _V_CODEBOOK_H_ cannam@86: cannam@86: #include cannam@86: cannam@86: /* This structure encapsulates huffman and VQ style encoding books; it cannam@86: doesn't do anything specific to either. cannam@86: cannam@86: valuelist/quantlist are nonNULL (and q_* significant) only if cannam@86: there's entry->value mapping to be done. cannam@86: cannam@86: If encode-side mapping must be done (and thus the entry needs to be cannam@86: hunted), the auxiliary encode pointer will point to a decision cannam@86: tree. This is true of both VQ and huffman, but is mostly useful cannam@86: with VQ. cannam@86: cannam@86: */ cannam@86: cannam@86: typedef struct static_codebook{ cannam@86: long dim; /* codebook dimensions (elements per vector) */ cannam@86: long entries; /* codebook entries */ cannam@86: long *lengthlist; /* codeword lengths in bits */ cannam@86: cannam@86: /* mapping ***************************************************************/ cannam@86: int maptype; /* 0=none cannam@86: 1=implicitly populated values from map column cannam@86: 2=listed arbitrary values */ cannam@86: cannam@86: /* The below does a linear, single monotonic sequence mapping. */ cannam@86: long q_min; /* packed 32 bit float; quant value 0 maps to minval */ cannam@86: long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */ cannam@86: int q_quant; /* bits: 0 < quant <= 16 */ cannam@86: int q_sequencep; /* bitflag */ cannam@86: cannam@86: long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map cannam@86: map == 2: list of dim*entries quantized entry vals cannam@86: */ cannam@86: int allocedp; cannam@86: } static_codebook; cannam@86: cannam@86: typedef struct codebook{ cannam@86: long dim; /* codebook dimensions (elements per vector) */ cannam@86: long entries; /* codebook entries */ cannam@86: long used_entries; /* populated codebook entries */ cannam@86: static_codebook *c; cannam@86: cannam@86: /* for encode, the below are entry-ordered, fully populated */ cannam@86: /* for decode, the below are ordered by bitreversed codeword and only cannam@86: used entries are populated */ cannam@86: float *valuelist; /* list of dim*entries actual entry values */ cannam@86: ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */ cannam@86: cannam@86: int *dec_index; /* only used if sparseness collapsed */ cannam@86: char *dec_codelengths; cannam@86: ogg_uint32_t *dec_firsttable; cannam@86: int dec_firsttablen; cannam@86: int dec_maxlength; cannam@86: cannam@86: /* The current encoder uses only centered, integer-only lattice books. */ cannam@86: int quantvals; cannam@86: int minval; cannam@86: int delta; cannam@86: cannam@86: } codebook; cannam@86: cannam@86: extern void vorbis_staticbook_clear(static_codebook *b); cannam@86: extern void vorbis_staticbook_destroy(static_codebook *b); cannam@86: extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source); cannam@86: extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source); cannam@86: extern void vorbis_book_clear(codebook *b); cannam@86: cannam@86: extern float *_book_unquantize(const static_codebook *b,int n,int *map); cannam@86: extern float *_book_logdist(const static_codebook *b,float *vals); cannam@86: extern float _float32_unpack(long val); cannam@86: extern long _float32_pack(float val); cannam@86: extern int _best(codebook *book, float *a, int step); cannam@86: extern int _ilog(unsigned int v); cannam@86: extern long _book_maptype1_quantvals(const static_codebook *b); cannam@86: cannam@86: extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul); cannam@86: extern long vorbis_book_codeword(codebook *book,int entry); cannam@86: extern long vorbis_book_codelen(codebook *book,int entry); cannam@86: cannam@86: cannam@86: cannam@86: extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b); cannam@86: extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c); cannam@86: cannam@86: extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b); cannam@86: cannam@86: extern long vorbis_book_decode(codebook *book, oggpack_buffer *b); cannam@86: extern long vorbis_book_decodevs_add(codebook *book, float *a, cannam@86: oggpack_buffer *b,int n); cannam@86: extern long vorbis_book_decodev_set(codebook *book, float *a, cannam@86: oggpack_buffer *b,int n); cannam@86: extern long vorbis_book_decodev_add(codebook *book, float *a, cannam@86: oggpack_buffer *b,int n); cannam@86: extern long vorbis_book_decodevv_add(codebook *book, float **a, cannam@86: long off,int ch, cannam@86: oggpack_buffer *b,int n); cannam@86: cannam@86: cannam@86: cannam@86: #endif