From 56fbebdcf71ea7c8e64cb18ac3a78e5834134fa3 Mon Sep 17 00:00:00 2001
From: Monty <xiphmont@xiph.org>
Date: Mon, 2 Sep 2002 22:13:55 +0000
Subject: Put root level of Tremor in CVS

git-svn-id: https://svn.xiph.org/trunk/Tremor@3890 0101bb08-14d6-0310-b084-bc0e0c8e3800
---
 backends.h | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 backends.h

(limited to 'backends.h')

diff --git a/backends.h b/backends.h
new file mode 100644
index 0000000..046e680
--- /dev/null
+++ b/backends.h
@@ -0,0 +1,127 @@
+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
+ *                                                                  *
+ * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
+ * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
+ * ALL REDISTRIBUTION RIGHTS RESERVED.                              *
+ *                                                                  *
+ ********************************************************************
+
+ 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
+
+
+
+
+
-- 
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