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132 lines
4.5 KiB
C
132 lines
4.5 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: backend and mapping structures
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********************************************************************/
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/* this is exposed up here because we need it for static modes.
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Lookups for each backend aren't exposed because there's no reason
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to do so */
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#ifndef _vorbis_backend_h_
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#define _vorbis_backend_h_
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#include "codec_internal.h"
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/* this would all be simpler/shorter with templates, but.... */
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/* Transform backend generic *************************************/
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/* only mdct right now. Flesh it out more if we ever transcend mdct
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in the transform domain */
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/* Floor backend generic *****************************************/
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typedef struct{
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vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
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vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
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vorbis_info_floor *);
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void (*free_info) (vorbis_info_floor *);
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void (*free_look) (vorbis_look_floor *);
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void *(*inverse1) (struct vorbis_block *,vorbis_look_floor *);
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int (*inverse2) (struct vorbis_block *,vorbis_look_floor *,
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void *buffer,ogg_int32_t *);
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} vorbis_func_floor;
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typedef struct{
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int order;
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long rate;
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long barkmap;
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int ampbits;
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int ampdB;
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int numbooks; /* <= 16 */
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int books[16];
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} vorbis_info_floor0;
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#define VIF_POSIT 63
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#define VIF_CLASS 16
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#define VIF_PARTS 31
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typedef struct{
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int partitions; /* 0 to 31 */
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int partitionclass[VIF_PARTS]; /* 0 to 15 */
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int class_dim[VIF_CLASS]; /* 1 to 8 */
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int class_subs[VIF_CLASS]; /* 0,1,2,3 (bits: 1<<n poss) */
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int class_book[VIF_CLASS]; /* subs ^ dim entries */
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int class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
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int mult; /* 1 2 3 or 4 */
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int postlist[VIF_POSIT+2]; /* first two implicit */
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} vorbis_info_floor1;
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/* Residue backend generic *****************************************/
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typedef struct{
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vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
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vorbis_look_residue *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
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vorbis_info_residue *);
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void (*free_info) (vorbis_info_residue *);
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void (*free_look) (vorbis_look_residue *);
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int (*inverse) (struct vorbis_block *,vorbis_look_residue *,
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ogg_int32_t **,int *,int);
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} vorbis_func_residue;
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typedef struct vorbis_info_residue0{
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/* block-partitioned VQ coded straight residue */
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long begin;
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long end;
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/* first stage (lossless partitioning) */
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int grouping; /* group n vectors per partition */
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int partitions; /* possible codebooks for a partition */
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int partvals; /* partitions ^ groupbook dim */
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int groupbook; /* huffbook for partitioning */
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int secondstages[64]; /* expanded out to pointers in lookup */
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int booklist[512]; /* list of second stage books */
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} vorbis_info_residue0;
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/* Mapping backend generic *****************************************/
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typedef struct{
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vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
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vorbis_look_mapping *(*look) (vorbis_dsp_state *,vorbis_info_mode *,
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vorbis_info_mapping *);
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void (*free_info) (vorbis_info_mapping *);
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void (*free_look) (vorbis_look_mapping *);
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int (*inverse) (struct vorbis_block *vb,vorbis_look_mapping *);
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} vorbis_func_mapping;
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typedef struct vorbis_info_mapping0{
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int submaps; /* <= 16 */
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int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */
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int floorsubmap[16]; /* [mux] submap to floors */
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int residuesubmap[16]; /* [mux] submap to residue */
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int psy[2]; /* by blocktype; impulse/padding for short,
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transition/normal for long */
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int coupling_steps;
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int coupling_mag[256];
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int coupling_ang[256];
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} vorbis_info_mapping0;
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#endif
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