--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libtremor/tremor/backends.h Sun Oct 09 20:41:17 2011 +0200
@@ -0,0 +1,130 @@
+/********************************************************************
+ * *
+ * 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 groupbook; /* huffbook for partitioning */
+ int secondstages[64]; /* expanded out to pointers in lookup */
+ int booklist[256]; /* 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
+
+
+
+
+