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Diffstat (limited to 'media/libtremor/lib/backends.h')
| -rw-r--r-- | media/libtremor/lib/backends.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/media/libtremor/lib/backends.h b/media/libtremor/lib/backends.h new file mode 100644 index 000000000..52024219b --- /dev/null +++ b/media/libtremor/lib/backends.h @@ -0,0 +1,131 @@ +/******************************************************************** + * * + * 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 + + + + + |