1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libtremor/lib/backends.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,131 @@
1.4 +/********************************************************************
1.5 + * *
1.6 + * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
1.7 + * *
1.8 + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
1.9 + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
1.10 + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
1.11 + * *
1.12 + * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
1.13 + * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
1.14 + * *
1.15 + ********************************************************************
1.16 +
1.17 + function: backend and mapping structures
1.18 +
1.19 + ********************************************************************/
1.20 +
1.21 +/* this is exposed up here because we need it for static modes.
1.22 + Lookups for each backend aren't exposed because there's no reason
1.23 + to do so */
1.24 +
1.25 +#ifndef _vorbis_backend_h_
1.26 +#define _vorbis_backend_h_
1.27 +
1.28 +#include "codec_internal.h"
1.29 +
1.30 +/* this would all be simpler/shorter with templates, but.... */
1.31 +/* Transform backend generic *************************************/
1.32 +
1.33 +/* only mdct right now. Flesh it out more if we ever transcend mdct
1.34 + in the transform domain */
1.35 +
1.36 +/* Floor backend generic *****************************************/
1.37 +typedef struct{
1.38 + vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
1.39 + vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
1.40 + vorbis_info_floor *);
1.41 + void (*free_info) (vorbis_info_floor *);
1.42 + void (*free_look) (vorbis_look_floor *);
1.43 + void *(*inverse1) (struct vorbis_block *,vorbis_look_floor *);
1.44 + int (*inverse2) (struct vorbis_block *,vorbis_look_floor *,
1.45 + void *buffer,ogg_int32_t *);
1.46 +} vorbis_func_floor;
1.47 +
1.48 +typedef struct{
1.49 + int order;
1.50 + long rate;
1.51 + long barkmap;
1.52 +
1.53 + int ampbits;
1.54 + int ampdB;
1.55 +
1.56 + int numbooks; /* <= 16 */
1.57 + int books[16];
1.58 +
1.59 +} vorbis_info_floor0;
1.60 +
1.61 +#define VIF_POSIT 63
1.62 +#define VIF_CLASS 16
1.63 +#define VIF_PARTS 31
1.64 +typedef struct{
1.65 + int partitions; /* 0 to 31 */
1.66 + int partitionclass[VIF_PARTS]; /* 0 to 15 */
1.67 +
1.68 + int class_dim[VIF_CLASS]; /* 1 to 8 */
1.69 + int class_subs[VIF_CLASS]; /* 0,1,2,3 (bits: 1<<n poss) */
1.70 + int class_book[VIF_CLASS]; /* subs ^ dim entries */
1.71 + int class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
1.72 +
1.73 +
1.74 + int mult; /* 1 2 3 or 4 */
1.75 + int postlist[VIF_POSIT+2]; /* first two implicit */
1.76 +
1.77 +} vorbis_info_floor1;
1.78 +
1.79 +/* Residue backend generic *****************************************/
1.80 +typedef struct{
1.81 + vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
1.82 + vorbis_look_residue *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
1.83 + vorbis_info_residue *);
1.84 + void (*free_info) (vorbis_info_residue *);
1.85 + void (*free_look) (vorbis_look_residue *);
1.86 + int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
1.87 + ogg_int32_t **,int *,int);
1.88 +} vorbis_func_residue;
1.89 +
1.90 +typedef struct vorbis_info_residue0{
1.91 +/* block-partitioned VQ coded straight residue */
1.92 + long begin;
1.93 + long end;
1.94 +
1.95 + /* first stage (lossless partitioning) */
1.96 + int grouping; /* group n vectors per partition */
1.97 + int partitions; /* possible codebooks for a partition */
1.98 + int partvals; /* partitions ^ groupbook dim */
1.99 + int groupbook; /* huffbook for partitioning */
1.100 + int secondstages[64]; /* expanded out to pointers in lookup */
1.101 + int booklist[512]; /* list of second stage books */
1.102 +} vorbis_info_residue0;
1.103 +
1.104 +/* Mapping backend generic *****************************************/
1.105 +typedef struct{
1.106 + vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
1.107 + vorbis_look_mapping *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
1.108 + vorbis_info_mapping *);
1.109 + void (*free_info) (vorbis_info_mapping *);
1.110 + void (*free_look) (vorbis_look_mapping *);
1.111 + int (*inverse) (struct vorbis_block *vb,vorbis_look_mapping *);
1.112 +} vorbis_func_mapping;
1.113 +
1.114 +typedef struct vorbis_info_mapping0{
1.115 + int submaps; /* <= 16 */
1.116 + int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
1.117 +
1.118 + int floorsubmap[16]; /* [mux] submap to floors */
1.119 + int residuesubmap[16]; /* [mux] submap to residue */
1.120 +
1.121 + int psy[2]; /* by blocktype; impulse/padding for short,
1.122 + transition/normal for long */
1.123 +
1.124 + int coupling_steps;
1.125 + int coupling_mag[256];
1.126 + int coupling_ang[256];
1.127 +} vorbis_info_mapping0;
1.128 +
1.129 +#endif
1.130 +
1.131 +
1.132 +
1.133 +
1.134 +
