/* this would all be simpler/shorter with templates, but.... */ /* Floor backend generic *****************************************/ typedefstruct{ 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;
typedefstruct{ 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 typedefstruct{ 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 */
typedefstruct 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 */
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