misc/libtremor/tremor/codebook.h
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6043:9bd2d6b1ba52 6045:9a7cc0f29430
       
     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.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_clear(static_codebook *b);
       
    80 extern void vorbis_staticbook_destroy(static_codebook *b);
       
    81 extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
       
    82 
       
    83 extern void vorbis_book_clear(codebook *b);
       
    84 extern long _book_maptype1_quantvals(const static_codebook *b);
       
    85 
       
    86 extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c);
       
    87 
       
    88 extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
       
    89 extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a, 
       
    90 				     oggpack_buffer *b,int n,int point);
       
    91 extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a, 
       
    92 				    oggpack_buffer *b,int n,int point);
       
    93 extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a, 
       
    94 				    oggpack_buffer *b,int n,int point);
       
    95 extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a,
       
    96 				     long off,int ch, 
       
    97 				    oggpack_buffer *b,int n,int point);
       
    98 
       
    99 extern int _ilog(unsigned int v);
       
   100 
       
   101 
       
   102 #endif