backends.h - vx32 - Local 9vx git repository for patches.
(HTM) git clone git://r-36.net/vx32
(DIR) Log
(DIR) Files
(DIR) Refs
---
backends.h (5006B)
---
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 1994-2002 *
9 * by the XIPHOPHORUS Company 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 1919 2005-07-24 14:18:04Z baford $
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 *****************************************/
30 typedef 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
41 typedef 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
61 typedef 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 *****************************************/
88 typedef 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) (struct vorbis_block *,vorbis_look_residue *,
98 float **,float **,int *,int,long **);
99 int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
100 float **,int *,int);
101 } vorbis_func_residue;
102
103 typedef struct vorbis_info_residue0{
104 /* block-partitioned VQ coded straight residue */
105 long begin;
106 long end;
107
108 /* first stage (lossless partitioning) */
109 int grouping; /* group n vectors per partition */
110 int partitions; /* possible codebooks for a partition */
111 int groupbook; /* huffbook for partitioning */
112 int secondstages[64]; /* expanded out to pointers in lookup */
113 int booklist[256]; /* list of second stage books */
114
115 float classmetric1[64];
116 float classmetric2[64];
117
118 } vorbis_info_residue0;
119
120 /* Mapping backend generic *****************************************/
121 typedef struct{
122 void (*pack) (vorbis_info *,vorbis_info_mapping *,
123 oggpack_buffer *);
124 vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
125 void (*free_info) (vorbis_info_mapping *);
126 int (*forward) (struct vorbis_block *vb);
127 int (*inverse) (struct vorbis_block *vb,vorbis_info_mapping *);
128 } vorbis_func_mapping;
129
130 typedef struct vorbis_info_mapping0{
131 int submaps; /* <= 16 */
132 int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
133
134 int floorsubmap[16]; /* [mux] submap to floors */
135 int residuesubmap[16]; /* [mux] submap to residue */
136
137 int coupling_steps;
138 int coupling_mag[256];
139 int coupling_ang[256];
140
141 } vorbis_info_mapping0;
142
143 #endif
144
145