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source: downloads/libvorbis-1.2.0/lib/backends.h @ 16

Last change on this file since 16 was 16, checked in by landauf, 16 years ago

added libvorbis
File size: 4.9 KB
Line 
1/********************************************************************
2 *                                                                  *
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
7 *                                                                  *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
9 * by the Xiph.Org Foundation http://www.xiph.org/                  *
10 *                                                                  *
11 ********************************************************************
12
13 function: libvorbis backend and mapping structures; needed for
14           static mode headers
15 last mod: $Id: backends.h 13293 2007-07-24 00:09:47Z xiphmont $
16
17 ********************************************************************/
18
19/* this is exposed up here because we need it for static modes.
20   Lookups for each backend aren't exposed because there's no reason
21   to do so */
22
23#ifndef _vorbis_backend_h_
24#define _vorbis_backend_h_
25
26#include "codec_internal.h"
27
28/* this would all be simpler/shorter with templates, but.... */
29/* Floor backend generic *****************************************/
30typedef struct{
31  void                   (*pack)  (vorbis_info_floor *,oggpack_buffer *);
32  vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
33  vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_floor *);
34  void (*free_info) (vorbis_info_floor *);
35  void (*free_look) (vorbis_look_floor *);
36  void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
37  int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
38                     void *buffer,float *);
39} vorbis_func_floor;
40
41typedef struct{
42  int   order;
43  long  rate;
44  long  barkmap;
45
46  int   ampbits;
47  int   ampdB;
48
49  int   numbooks; /* <= 16 */
50  int   books[16];
51
52  float lessthan;     /* encode-only config setting hacks for libvorbis */
53  float greaterthan;  /* encode-only config setting hacks for libvorbis */
54
55} vorbis_info_floor0;
56
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
75  /* encode side analysis parameters */
76  float maxover;     
77  float maxunder; 
78  float maxerr;   
79
80  float twofitweight; 
81  float twofitatten;
82
83  int   n;
84
85} vorbis_info_floor1;
86
87/* Residue backend generic *****************************************/
88typedef struct{
89  void                 (*pack)  (vorbis_info_residue *,oggpack_buffer *);
90  vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
91  vorbis_look_residue *(*look)  (vorbis_dsp_state *,
92                                 vorbis_info_residue *);
93  void (*free_info)    (vorbis_info_residue *);
94  void (*free_look)    (vorbis_look_residue *);
95  long **(*class)      (struct vorbis_block *,vorbis_look_residue *,
96                        float **,int *,int);
97  int  (*forward)      (oggpack_buffer *,struct vorbis_block *,
98                        vorbis_look_residue *,
99                        float **,float **,int *,int,long **);
100  int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
101                        float **,int *,int);
102} vorbis_func_residue;
103
104typedef struct vorbis_info_residue0{
105/* block-partitioned VQ coded straight residue */
106  long  begin;
107  long  end;
108
109  /* first stage (lossless partitioning) */
110  int    grouping;         /* group n vectors per partition */
111  int    partitions;       /* possible codebooks for a partition */
112  int    groupbook;        /* huffbook for partitioning */
113  int    secondstages[64]; /* expanded out to pointers in lookup */
114  int    booklist[256];    /* list of second stage books */
115
116  float  classmetric1[64]; 
117  float  classmetric2[64]; 
118
119} vorbis_info_residue0;
120
121/* Mapping backend generic *****************************************/
122typedef struct{
123  void                 (*pack)  (vorbis_info *,vorbis_info_mapping *,
124                                 oggpack_buffer *);
125  vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
126  void (*free_info)    (vorbis_info_mapping *);
127  int  (*forward)      (struct vorbis_block *vb);
128  int  (*inverse)      (struct vorbis_block *vb,vorbis_info_mapping *);
129} vorbis_func_mapping;
130
131typedef struct vorbis_info_mapping0{
132  int   submaps;  /* <= 16 */
133  int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
134 
135  int   floorsubmap[16];   /* [mux] submap to floors */
136  int   residuesubmap[16]; /* [mux] submap to residue */
137
138  int   coupling_steps;
139  int   coupling_mag[256];
140  int   coupling_ang[256];
141
142} vorbis_info_mapping0;
143
144#endif
145
146
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