ref: 53d55013598d7cd214d01cbf0b026844fe7ca8d2
dir: /sys/src/cmd/audio/libvorbis/backends.h/
/******************************************************************** * * * 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