/********************************************************************
* *
* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
* *
* THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
* by the Xiph.Org Foundation https://xiph.org/ *
* *
********************************************************************
function: libvorbis backend and mapping structures; needed for
static mode headers
********************************************************************/
/* this is exposed up here because we need it for static modes.
Lookups for each backend aren't exposed because there's no reason
to do so */
#ifndef _vorbis_backend_h_
#define _vorbis_backend_h_
#include "codec_internal.h"
/* this would all be simpler/shorter with templates, but.... */
/* Floor backend generic *****************************************/
typedef struct{
void (*
pack) (vorbis_info_floor *,oggpack_buffer *);
vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *);
vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_floor *);
void (*free_info) (vorbis_info_floor *);
void (*free_look) (vorbis_look_floor *);
void *(*inverse1) (
struct vorbis_block *,vorbis_look_floor *);
int (*inverse2) (
struct vorbis_block *,vorbis_look_floor *,
void *buffer,
float *);
} vorbis_func_floor;
typedef struct{
int order;
long rate;
long barkmap;
int ampbits;
int ampdB;
int numbooks;
/* <= 16 */
int books[16];
float lessthan;
/* encode-only config setting hacks for libvorbis */
float greaterthan;
/* encode-only config setting hacks for libvorbis */
} vorbis_info_floor0;
#define VIF_POSIT 63
#define VIF_CLASS 16
#define VIF_PARTS 31
typedef struct{
int partitions;
/* 0 to 31 */
int partitionclass[VIF_PARTS];
/* 0 to 15 */
int class_dim[VIF_CLASS];
/* 1 to 8 */
int class_subs[VIF_CLASS];
/* 0,1,2,3 (bits: 1<<n poss) */
int class_book[VIF_CLASS];
/* subs ^ dim entries */
int class_subbook[VIF_CLASS][8];
/* [VIF_CLASS][subs] */
int mult;
/* 1 2 3 or 4 */
int postlist[VIF_POSIT+2];
/* first two implicit */
/* encode side analysis parameters */
float maxover;
float maxunder;
float maxerr;
float twofitweight;
float twofitatten;
int n;
} vorbis_info_floor1;
/* Residue backend generic *****************************************/
typedef struct{
void (*
pack) (vorbis_info_residue *,oggpack_buffer *);
vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
vorbis_look_residue *(*look) (vorbis_dsp_state *,
vorbis_info_residue *);
void (*free_info) (vorbis_info_residue *);
void (*free_look) (vorbis_look_residue *);
long **(*
class) (
struct vorbis_block *,vorbis_look_residue *,
int **,
int *,
int);
int (*forward) (oggpack_buffer *,
struct vorbis_block *,
vorbis_look_residue *,
int **,
int *,
int,
long **,
int);
int (*inverse) (
struct vorbis_block *,vorbis_look_residue *,
float **,
int *,
int);
} vorbis_func_residue;
typedef struct vorbis_info_residue0{
/* block-partitioned VQ coded straight residue */
long begin;
long end;
/* first stage (lossless partitioning) */
int grouping;
/* group n vectors per partition */
int partitions;
/* possible codebooks for a partition */
int partvals;
/* partitions ^ groupbook dim */
int groupbook;
/* huffbook for partitioning */
int secondstages[64];
/* expanded out to pointers in lookup */
int booklist[512];
/* list of second stage books */
const int classmetric1[64];
const int classmetric2[64];
} vorbis_info_residue0;
/* Mapping backend generic *****************************************/
typedef struct{
void (*
pack) (vorbis_info *,vorbis_info_mapping *,
oggpack_buffer *);
vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
void (*free_info) (vorbis_info_mapping *);
int (*forward) (
struct vorbis_block *vb);
int (*inverse) (
struct vorbis_block *vb,vorbis_info_mapping *);
} vorbis_func_mapping;
typedef struct vorbis_info_mapping0{
int submaps;
/* <= 16 */
int chmuxlist[256];
/* up to 256 channels in a Vorbis stream */
int floorsubmap[16];
/* [mux] submap to floors */
int residuesubmap[16];
/* [mux] submap to residue */
int coupling_steps;
int coupling_mag[256];
int coupling_ang[256];
} vorbis_info_mapping0;
#endif
