/******************************************************************** * * * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * * * ******************************************************************** function: backend and mapping structures ********************************************************************/ /* 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.... */ /* Transform backend generic *************************************/ /* only mdct right now. Flesh it out more if we ever transcend mdct in the transform domain */ /* Floor backend generic *****************************************/ typedef struct{ vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *); vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_mode *, 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,ogg_int32_t *); } vorbis_func_floor; typedef struct{ int order; long rate; long barkmap; int ampbits; int ampdB; int numbooks; /* <= 16 */ int books[16]; } 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 */ } vorbis_info_floor1; /* Residue backend generic *****************************************/ typedef struct{ vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *); vorbis_look_residue *(*look) (vorbis_dsp_state *,vorbis_info_mode *, vorbis_info_residue *); void (*free_info) (vorbis_info_residue *); void (*free_look) (vorbis_look_residue *); int (*inverse) (struct vorbis_block *,vorbis_look_residue *, ogg_int32_t **,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 */ } vorbis_info_residue0; /* Mapping backend generic *****************************************/ typedef struct{ vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *); vorbis_look_mapping *(*look) (vorbis_dsp_state *,vorbis_info_mode *, vorbis_info_mapping *); void (*free_info) (vorbis_info_mapping *); void (*free_look) (vorbis_look_mapping *); int (*inverse) (struct vorbis_block *vb,vorbis_look_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 psy[2]; /* by blocktype; impulse/padding for short, transition/normal for long */ int coupling_steps; int coupling_mag[256]; int coupling_ang[256]; } vorbis_info_mapping0; #endif