From 74f4b1bc3b627ba4c7e03498234d88cacdfbe97b Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Wed, 29 Sep 2021 22:52:49 +0200
Subject: Squashed 'vorbis/' content from commit d22c3ab5f

git-subtree-dir: vorbis
git-subtree-split: d22c3ab5f633460abc2532feee60ca0892134cbf
---
 lib/backends.h | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 lib/backends.h

(limited to 'lib/backends.h')

diff --git a/lib/backends.h b/lib/backends.h
new file mode 100644
index 0000000..22809d4
--- /dev/null
+++ b/lib/backends.h
@@ -0,0 +1,143 @@
+/********************************************************************
+ *                                                                  *
+ * 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 http://www.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
-- 
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