1 /********************************************************************
3 * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
6 * PLEASE READ THESE TERMS DISTRIBUTING. *
8 * THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and The XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: libvorbis backend and mapping structures; needed for
16 last mod: $Id: backends.h,v 1.9 2000/06/14 01:38:27 xiphmont Exp $
18 ********************************************************************/
20 /* this is exposed up here because we need it for static modes.
21 Lookups for each backend aren't exposed because there's no reason
24 #ifndef _vorbis_time_backend_h_
25 #define _vorbis_time_backend_h_
27 /* this would all be simpler/shorter with templates, but.... */
28 /* Transform backend generic *************************************/
30 /* only mdct right now. Flesh it out more if we ever transcend mdct
31 in the transform domain */
33 /* Time backend generic ******************************************/
35 void (*pack) (vorbis_info_time *,oggpack_buffer *);
36 vorbis_info_time *(*unpack)(vorbis_info *,oggpack_buffer *);
37 vorbis_look_time *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
39 void (*free_info) (vorbis_info_time *);
40 void (*free_look) (vorbis_look_time *);
41 int (*forward) (struct vorbis_block *,vorbis_look_time *,
43 int (*inverse) (struct vorbis_block *,vorbis_look_time *,
51 /* Floor backend generic *****************************************/
53 void (*pack) (vorbis_info_floor *,oggpack_buffer *);
54 vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
55 vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
57 vorbis_echstate_floor *(*state) (vorbis_info_floor *);
58 void (*free_info) (vorbis_info_floor *);
59 void (*free_look) (vorbis_look_floor *);
60 void (*free_state)(vorbis_echstate_floor *);
61 int (*forward) (struct vorbis_block *,vorbis_look_floor *,
62 double *,double *,vorbis_echstate_floor *);
63 int (*inverse) (struct vorbis_block *,vorbis_look_floor *,
75 int numbooks; /* <= 16 */
79 /* Residue backend generic *****************************************/
81 void (*pack) (vorbis_info_residue *,oggpack_buffer *);
82 vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
83 vorbis_look_residue *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
84 vorbis_info_residue *);
85 void (*free_info) (vorbis_info_residue *);
86 void (*free_look) (vorbis_look_residue *);
87 int (*forward) (struct vorbis_block *,vorbis_look_residue *,
89 int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
91 } vorbis_func_residue;
93 typedef struct vorbis_info_residue0{
94 /* block-partitioned VQ coded straight residue */
98 /* first stage (lossless partitioning) */
99 int grouping; /* group n vectors per partition */
100 int partitions; /* possible codebooks for a partition */
101 int groupbook; /* huffbook for partitioning */
102 int secondstages[64]; /* expanded out to pointers in lookup */
103 int booklist[256]; /* list of second stage books */
105 double entmax[64]; /* book entropy threshholds for *encode* */
106 double ampmax[64]; /* book amp threshholds for *encode* */
107 int subgrp[64]; /* book subgroup size for *encode* */
111 } vorbis_info_residue0;
113 /* Mapping backend generic *****************************************/
115 void (*pack) (vorbis_info *,vorbis_info_mapping *,
117 vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
118 vorbis_look_mapping *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
119 vorbis_info_mapping *);
120 void (*free_info) (vorbis_info_mapping *);
121 void (*free_look) (vorbis_look_mapping *);
122 int (*forward) (struct vorbis_block *vb,vorbis_look_mapping *);
123 int (*inverse) (struct vorbis_block *vb,vorbis_look_mapping *);
124 } vorbis_func_mapping;
126 typedef struct vorbis_info_mapping0{
127 int submaps; /* <= 16 */
128 int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
130 int timesubmap[16]; /* [mux] */
131 int floorsubmap[16]; /* [mux] submap to floors */
132 int residuesubmap[16]; /* [mux] submap to residue */
133 int psysubmap[16]; /* [mux]; encode only */
134 } vorbis_info_mapping0;