1 /********************************************************************
2  *                                                                  *
3  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
7  *                                                                  *
8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
10  *                                                                  *
11  ********************************************************************
12 
13  function: libvorbis backend and mapping structures; needed for
14            static mode headers
15  last mod: $Id: backends.h 16962 2010-03-11 07:30:34Z xiphmont $
16 
17  ********************************************************************/
18 
19 /* this is exposed up here because we need it for static modes.
20    Lookups for each backend aren't exposed because there's no reason
21    to do so */
22 
23 #ifndef _vorbis_backend_h_
24 #define _vorbis_backend_h_
25 
26 #include "codec_internal.h"
27 
28 /* this would all be simpler/shorter with templates, but.... */
29 /* Floor backend generic *****************************************/
30 typedef struct{
31   void                   (*pack)  (vorbis_info_floor *,oggpack_buffer *);
32   vorbis_info_floor     *(*unpack)(vorbis_info *,oggpack_buffer *);
33   vorbis_look_floor     *(*look)  (vorbis_dsp_state *,vorbis_info_floor *);
34   void (*free_info) (vorbis_info_floor *);
35   void (*free_look) (vorbis_look_floor *);
36   void *(*inverse1)  (struct vorbis_block *,vorbis_look_floor *);
37   int   (*inverse2)  (struct vorbis_block *,vorbis_look_floor *,
38                      void *buffer,float *);
39 } vorbis_func_floor;
40 
41 typedef struct{
42   int   order;
43   long  rate;
44   long  barkmap;
45 
46   int   ampbits;
47   int   ampdB;
48 
49   int   numbooks; /* <= 16 */
50   int   books[16];
51 
52   float lessthan;     /* encode-only config setting hacks for libvorbis */
53   float greaterthan;  /* encode-only config setting hacks for libvorbis */
54 
55 } vorbis_info_floor0;
56 
57 
58 #define VIF_POSIT 63
59 #define VIF_CLASS 16
60 #define VIF_PARTS 31
61 typedef struct{
62   int   partitions;                /* 0 to 31 */
63   int   partitionclass[VIF_PARTS]; /* 0 to 15 */
64 
65   int   class_dim[VIF_CLASS];        /* 1 to 8 */
66   int   class_subs[VIF_CLASS];       /* 0,1,2,3 (bits: 1<<n poss) */
67   int   class_book[VIF_CLASS];       /* subs ^ dim entries */
68   int   class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */
69 
70 
71   int   mult;                      /* 1 2 3 or 4 */
72   int   postlist[VIF_POSIT+2];    /* first two implicit */
73 
74 
75   /* encode side analysis parameters */
76   float maxover;
77   float maxunder;
78   float maxerr;
79 
80   float twofitweight;
81   float twofitatten;
82 
83   int   n;
84 
85 } vorbis_info_floor1;
86 
87 /* Residue backend generic *****************************************/
88 typedef struct{
89   void                 (*pack)  (vorbis_info_residue *,oggpack_buffer *);
90   vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *);
91   vorbis_look_residue *(*look)  (vorbis_dsp_state *,
92                                  vorbis_info_residue *);
93   void (*free_info)    (vorbis_info_residue *);
94   void (*free_look)    (vorbis_look_residue *);
95   long **(*class)      (struct vorbis_block *,vorbis_look_residue *,
96                         int **,int *,int);
97   int  (*forward)      (oggpack_buffer *,struct vorbis_block *,
98                         vorbis_look_residue *,
99                         int **,int *,int,long **,int);
100   int  (*inverse)      (struct vorbis_block *,vorbis_look_residue *,
101                         float **,int *,int);
102 } vorbis_func_residue;
103 
104 typedef struct vorbis_info_residue0{
105 /* block-partitioned VQ coded straight residue */
106   long  begin;
107   long  end;
108 
109   /* first stage (lossless partitioning) */
110   int    grouping;         /* group n vectors per partition */
111   int    partitions;       /* possible codebooks for a partition */
112   int    partvals;         /* partitions ^ groupbook dim */
113   int    groupbook;        /* huffbook for partitioning */
114   int    secondstages[64]; /* expanded out to pointers in lookup */
115   int    booklist[512];    /* list of second stage books */
116 
117   const int classmetric1[64];
118   const int classmetric2[64];
119 } vorbis_info_residue0;
120 
121 /* Mapping backend generic *****************************************/
122 typedef struct{
123   void                 (*pack)  (vorbis_info *,vorbis_info_mapping *,
124                                  oggpack_buffer *);
125   vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *);
126   void (*free_info)    (vorbis_info_mapping *);
127   int  (*forward)      (struct vorbis_block *vb);
128   int  (*inverse)      (struct vorbis_block *vb,vorbis_info_mapping *);
129 } vorbis_func_mapping;
130 
131 typedef struct vorbis_info_mapping0{
132   int   submaps;  /* <= 16 */
133   int   chmuxlist[256];   /* up to 256 channels in a Vorbis stream */
134 
135   int   floorsubmap[16];   /* [mux] submap to floors */
136   int   residuesubmap[16]; /* [mux] submap to residue */
137 
138   int   coupling_steps;
139   int   coupling_mag[256];
140   int   coupling_ang[256];
141 
142 } vorbis_info_mapping0;
143 
144 #endif
145