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/media/libtremor/lib/backends.h

http://github.com/zpao/v8monkey
C Header | 131 lines | 73 code | 29 blank | 29 comment | 0 complexity | 04345c1e38d4bd07faf96f4a37729ccb MD5 | raw file
  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: backend and mapping structures
 15
 16 ********************************************************************/
 17
 18/* this is exposed up here because we need it for static modes.
 19   Lookups for each backend aren't exposed because there's no reason
 20   to do so */
 21
 22#ifndef _vorbis_backend_h_
 23#define _vorbis_backend_h_
 24
 25#include "codec_internal.h"
 26
 27/* this would all be simpler/shorter with templates, but.... */
 28/* Transform backend generic *************************************/
 29
 30/* only mdct right now.  Flesh it out more if we ever transcend mdct
 31   in the transform domain */
 32
 33/* Floor backend generic *****************************************/
 34typedef struct{
 35  vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
 36  vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
 37				   vorbis_info_floor *);
 38  void (*free_info) (vorbis_info_floor *);
 39  void (*free_look) (vorbis_look_floor *);
 40  void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
 41  int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
 42		     void *buffer,ogg_int32_t *);
 43} vorbis_func_floor;
 44
 45typedef struct{
 46  int   order;
 47  long  rate;
 48  long  barkmap;
 49
 50  int   ampbits;
 51  int   ampdB;
 52
 53  int   numbooks; /* <= 16 */
 54  int   books[16];
 55
 56} vorbis_info_floor0;
 57
 58#define VIF_POSIT 63
 59#define VIF_CLASS 16
 60#define VIF_PARTS 31
 61typedef struct{
 62  int   partitions;                /* 0 to 31 */
 63  int   partitionclass[VIF_PARTS]; /* 0 to 15 */
 64
 65  int   class_dim[VIF_CLASS];        /* 1 to 8 */
 66  int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
 67  int   class_book[VIF_CLASS];       /* subs ^ dim entries */
 68  int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
 69
 70
 71  int   mult;                      /* 1 2 3 or 4 */ 
 72  int   postlist[VIF_POSIT+2];    /* first two implicit */ 
 73
 74} vorbis_info_floor1;
 75
 76/* Residue backend generic *****************************************/
 77typedef struct{
 78  vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
 79  vorbis_look_residue *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
 80				 vorbis_info_residue *);
 81  void (*free_info)    (vorbis_info_residue *);
 82  void (*free_look)    (vorbis_look_residue *);
 83  int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
 84			ogg_int32_t **,int *,int);
 85} vorbis_func_residue;
 86
 87typedef struct vorbis_info_residue0{
 88/* block-partitioned VQ coded straight residue */
 89  long  begin;
 90  long  end;
 91
 92  /* first stage (lossless partitioning) */
 93  int    grouping;         /* group n vectors per partition */
 94  int    partitions;       /* possible codebooks for a partition */
 95  int    partvals;         /* partitions ^ groupbook dim */
 96  int    groupbook;        /* huffbook for partitioning */
 97  int    secondstages[64]; /* expanded out to pointers in lookup */
 98  int    booklist[512];    /* list of second stage books */
 99} vorbis_info_residue0;
100
101/* Mapping backend generic *****************************************/
102typedef struct{
103  vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
104  vorbis_look_mapping *(*look)  (vorbis_dsp_state *,vorbis_info_mode *,
105				 vorbis_info_mapping *);
106  void (*free_info)    (vorbis_info_mapping *);
107  void (*free_look)    (vorbis_look_mapping *);
108  int  (*inverse)      (struct vorbis_block *vb,vorbis_look_mapping *);
109} vorbis_func_mapping;
110
111typedef struct vorbis_info_mapping0{
112  int   submaps;  /* <= 16 */
113  int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
114  
115  int   floorsubmap[16];   /* [mux] submap to floors */
116  int   residuesubmap[16]; /* [mux] submap to residue */
117
118  int   psy[2]; /* by blocktype; impulse/padding for short,
119                   transition/normal for long */
120
121  int   coupling_steps;
122  int   coupling_mag[256];
123  int   coupling_ang[256];
124} vorbis_info_mapping0;
125
126#endif
127
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