author | nemo |
Wed, 24 Aug 2011 15:09:41 -0400 | |
changeset 5676 | a655dfab27d7 |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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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 groupbook; /* huffbook for partitioning */ |
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int secondstages[64]; /* expanded out to pointers in lookup */ |
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int booklist[256]; /* 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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