1 /********************************************************************
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. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
9 * by the Xiph.Org Foundation https://xiph.org/ *
11 ********************************************************************
13 function: libvorbis backend and mapping structures; needed for
16 ********************************************************************/
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
22 #ifndef _vorbis_backend_h_
23 #define _vorbis_backend_h_
25 #include "codec_internal.h"
27 /* this would all be simpler/shorter with templates, but.... */
28 /* Floor backend generic *****************************************/
30 void (*pack) (vorbis_info_floor *,oggpack_buffer *);
31 vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
32 vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_floor *);
33 void (*free_info) (vorbis_info_floor *);
34 void (*free_look) (vorbis_look_floor *);
35 void *(*inverse1) (struct vorbis_block *,vorbis_look_floor *);
36 int (*inverse2) (struct vorbis_block *,vorbis_look_floor *,
37 void *buffer,float *);
48 int numbooks; /* <= 16 */
51 float lessthan; /* encode-only config setting hacks for libvorbis */
52 float greaterthan; /* encode-only config setting hacks for libvorbis */
61 int partitions; /* 0 to 31 */
62 int partitionclass[VIF_PARTS]; /* 0 to 15 */
64 int class_dim[VIF_CLASS]; /* 1 to 8 */
65 int class_subs[VIF_CLASS]; /* 0,1,2,3 (bits: 1<<n poss) */
66 int class_book[VIF_CLASS]; /* subs ^ dim entries */
67 int class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
70 int mult; /* 1 2 3 or 4 */
71 int postlist[VIF_POSIT+2]; /* first two implicit */
74 /* encode side analysis parameters */
86 /* Residue backend generic *****************************************/
88 void (*pack) (vorbis_info_residue *,oggpack_buffer *);
89 vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
90 vorbis_look_residue *(*look) (vorbis_dsp_state *,
91 vorbis_info_residue *);
92 void (*free_info) (vorbis_info_residue *);
93 void (*free_look) (vorbis_look_residue *);
94 long **(*class) (struct vorbis_block *,vorbis_look_residue *,
96 int (*forward) (oggpack_buffer *,struct vorbis_block *,
97 vorbis_look_residue *,
98 int **,int *,int,long **,int);
99 int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
101 } vorbis_func_residue;
103 typedef struct vorbis_info_residue0{
104 /* block-partitioned VQ coded straight residue */
108 /* first stage (lossless partitioning) */
109 int grouping; /* group n vectors per partition */
110 int partitions; /* possible codebooks for a partition */
111 int partvals; /* partitions ^ groupbook dim */
112 int groupbook; /* huffbook for partitioning */
113 int secondstages[64]; /* expanded out to pointers in lookup */
114 int booklist[512]; /* list of second stage books */
116 const int classmetric1[64];
117 const int classmetric2[64];
118 } vorbis_info_residue0;
120 /* Mapping backend generic *****************************************/
122 void (*pack) (vorbis_info *,vorbis_info_mapping *,
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;
130 typedef struct vorbis_info_mapping0{
131 int submaps; /* <= 16 */
132 int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
134 int floorsubmap[16]; /* [mux] submap to floors */
135 int residuesubmap[16]; /* [mux] submap to residue */
138 int coupling_mag[256];
139 int coupling_ang[256];
141 } vorbis_info_mapping0;