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annotate libs/vorbis/backends.h @ 0:b2f14e535253

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
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nuclear@0 1 /********************************************************************
nuclear@0 2 * *
nuclear@0 3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
nuclear@0 4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
nuclear@0 5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
nuclear@0 6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
nuclear@0 7 * *
nuclear@0 8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
nuclear@0 9 * by the Xiph.Org Foundation http://www.xiph.org/ *
nuclear@0 10 * *
nuclear@0 11 ********************************************************************
nuclear@0 12
nuclear@0 13 function: libvorbis backend and mapping structures; needed for
nuclear@0 14 static mode headers
nuclear@0 15 last mod: $Id: backends.h 16962 2010-03-11 07:30:34Z xiphmont $
nuclear@0 16
nuclear@0 17 ********************************************************************/
nuclear@0 18
nuclear@0 19 /* this is exposed up here because we need it for static modes.
nuclear@0 20 Lookups for each backend aren't exposed because there's no reason
nuclear@0 21 to do so */
nuclear@0 22
nuclear@0 23 #ifndef _vorbis_backend_h_
nuclear@0 24 #define _vorbis_backend_h_
nuclear@0 25
nuclear@0 26 #include "codec_internal.h"
nuclear@0 27
nuclear@0 28 /* this would all be simpler/shorter with templates, but.... */
nuclear@0 29 /* Floor backend generic *****************************************/
nuclear@0 30 typedef struct{
nuclear@0 31 void (*pack) (vorbis_info_floor *,oggpack_buffer *);
nuclear@0 32 vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
nuclear@0 33 vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_floor *);
nuclear@0 34 void (*free_info) (vorbis_info_floor *);
nuclear@0 35 void (*free_look) (vorbis_look_floor *);
nuclear@0 36 void *(*inverse1) (struct vorbis_block *,vorbis_look_floor *);
nuclear@0 37 int (*inverse2) (struct vorbis_block *,vorbis_look_floor *,
nuclear@0 38 void *buffer,float *);
nuclear@0 39 } vorbis_func_floor;
nuclear@0 40
nuclear@0 41 typedef struct{
nuclear@0 42 int order;
nuclear@0 43 long rate;
nuclear@0 44 long barkmap;
nuclear@0 45
nuclear@0 46 int ampbits;
nuclear@0 47 int ampdB;
nuclear@0 48
nuclear@0 49 int numbooks; /* <= 16 */
nuclear@0 50 int books[16];
nuclear@0 51
nuclear@0 52 float lessthan; /* encode-only config setting hacks for libvorbis */
nuclear@0 53 float greaterthan; /* encode-only config setting hacks for libvorbis */
nuclear@0 54
nuclear@0 55 } vorbis_info_floor0;
nuclear@0 56
nuclear@0 57
nuclear@0 58 #define VIF_POSIT 63
nuclear@0 59 #define VIF_CLASS 16
nuclear@0 60 #define VIF_PARTS 31
nuclear@0 61 typedef struct{
nuclear@0 62 int partitions; /* 0 to 31 */
nuclear@0 63 int partitionclass[VIF_PARTS]; /* 0 to 15 */
nuclear@0 64
nuclear@0 65 int class_dim[VIF_CLASS]; /* 1 to 8 */
nuclear@0 66 int class_subs[VIF_CLASS]; /* 0,1,2,3 (bits: 1<<n poss) */
nuclear@0 67 int class_book[VIF_CLASS]; /* subs ^ dim entries */
nuclear@0 68 int class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
nuclear@0 69
nuclear@0 70
nuclear@0 71 int mult; /* 1 2 3 or 4 */
nuclear@0 72 int postlist[VIF_POSIT+2]; /* first two implicit */
nuclear@0 73
nuclear@0 74
nuclear@0 75 /* encode side analysis parameters */
nuclear@0 76 float maxover;
nuclear@0 77 float maxunder;
nuclear@0 78 float maxerr;
nuclear@0 79
nuclear@0 80 float twofitweight;
nuclear@0 81 float twofitatten;
nuclear@0 82
nuclear@0 83 int n;
nuclear@0 84
nuclear@0 85 } vorbis_info_floor1;
nuclear@0 86
nuclear@0 87 /* Residue backend generic *****************************************/
nuclear@0 88 typedef struct{
nuclear@0 89 void (*pack) (vorbis_info_residue *,oggpack_buffer *);
nuclear@0 90 vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
nuclear@0 91 vorbis_look_residue *(*look) (vorbis_dsp_state *,
nuclear@0 92 vorbis_info_residue *);
nuclear@0 93 void (*free_info) (vorbis_info_residue *);
nuclear@0 94 void (*free_look) (vorbis_look_residue *);
nuclear@0 95 long **(*class) (struct vorbis_block *,vorbis_look_residue *,
nuclear@0 96 int **,int *,int);
nuclear@0 97 int (*forward) (oggpack_buffer *,struct vorbis_block *,
nuclear@0 98 vorbis_look_residue *,
nuclear@0 99 int **,int *,int,long **,int);
nuclear@0 100 int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
nuclear@0 101 float **,int *,int);
nuclear@0 102 } vorbis_func_residue;
nuclear@0 103
nuclear@0 104 typedef struct vorbis_info_residue0{
nuclear@0 105 /* block-partitioned VQ coded straight residue */
nuclear@0 106 long begin;
nuclear@0 107 long end;
nuclear@0 108
nuclear@0 109 /* first stage (lossless partitioning) */
nuclear@0 110 int grouping; /* group n vectors per partition */
nuclear@0 111 int partitions; /* possible codebooks for a partition */
nuclear@0 112 int partvals; /* partitions ^ groupbook dim */
nuclear@0 113 int groupbook; /* huffbook for partitioning */
nuclear@0 114 int secondstages[64]; /* expanded out to pointers in lookup */
nuclear@0 115 int booklist[512]; /* list of second stage books */
nuclear@0 116
nuclear@0 117 const int classmetric1[64];
nuclear@0 118 const int classmetric2[64];
nuclear@0 119 } vorbis_info_residue0;
nuclear@0 120
nuclear@0 121 /* Mapping backend generic *****************************************/
nuclear@0 122 typedef struct{
nuclear@0 123 void (*pack) (vorbis_info *,vorbis_info_mapping *,
nuclear@0 124 oggpack_buffer *);
nuclear@0 125 vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
nuclear@0 126 void (*free_info) (vorbis_info_mapping *);
nuclear@0 127 int (*forward) (struct vorbis_block *vb);
nuclear@0 128 int (*inverse) (struct vorbis_block *vb,vorbis_info_mapping *);
nuclear@0 129 } vorbis_func_mapping;
nuclear@0 130
nuclear@0 131 typedef struct vorbis_info_mapping0{
nuclear@0 132 int submaps; /* <= 16 */
nuclear@0 133 int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
nuclear@0 134
nuclear@0 135 int floorsubmap[16]; /* [mux] submap to floors */
nuclear@0 136 int residuesubmap[16]; /* [mux] submap to residue */
nuclear@0 137
nuclear@0 138 int coupling_steps;
nuclear@0 139 int coupling_mag[256];
nuclear@0 140 int coupling_ang[256];
nuclear@0 141
nuclear@0 142 } vorbis_info_mapping0;
nuclear@0 143
nuclear@0 144 #endif