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1 /******************************************************************** |
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2 * * |
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3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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4 * * |
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5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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8 * * |
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9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
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10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
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11 * * |
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12 ******************************************************************** |
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13 |
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14 function: backend and mapping structures |
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15 |
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16 ********************************************************************/ |
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17 |
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18 /* this is exposed up here because we need it for static modes. |
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19 Lookups for each backend aren't exposed because there's no reason |
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20 to do so */ |
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21 |
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22 #ifndef _vorbis_backend_h_ |
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23 #define _vorbis_backend_h_ |
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24 |
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25 #include "codec_internal.h" |
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26 |
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27 /* this would all be simpler/shorter with templates, but.... */ |
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28 /* Transform backend generic *************************************/ |
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29 |
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30 /* only mdct right now. Flesh it out more if we ever transcend mdct |
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31 in the transform domain */ |
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32 |
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33 /* Floor backend generic *****************************************/ |
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34 typedef struct{ |
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35 vorbis_info_floor *(*unpack)(vorbis_info *,oggpack_buffer *); |
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36 vorbis_look_floor *(*look) (vorbis_dsp_state *,vorbis_info_mode *, |
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37 vorbis_info_floor *); |
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38 void (*free_info) (vorbis_info_floor *); |
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39 void (*free_look) (vorbis_look_floor *); |
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40 void *(*inverse1) (struct vorbis_block *,vorbis_look_floor *); |
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41 int (*inverse2) (struct vorbis_block *,vorbis_look_floor *, |
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42 void *buffer,ogg_int32_t *); |
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43 } vorbis_func_floor; |
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44 |
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45 typedef struct{ |
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46 int order; |
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47 long rate; |
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48 long barkmap; |
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49 |
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50 int ampbits; |
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51 int ampdB; |
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52 |
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53 int numbooks; /* <= 16 */ |
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54 int books[16]; |
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55 |
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56 } vorbis_info_floor0; |
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57 |
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58 #define VIF_POSIT 63 |
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59 #define VIF_CLASS 16 |
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60 #define VIF_PARTS 31 |
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61 typedef struct{ |
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62 int partitions; /* 0 to 31 */ |
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63 int partitionclass[VIF_PARTS]; /* 0 to 15 */ |
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64 |
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65 int class_dim[VIF_CLASS]; /* 1 to 8 */ |
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66 int class_subs[VIF_CLASS]; /* 0,1,2,3 (bits: 1<<n poss) */ |
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67 int class_book[VIF_CLASS]; /* subs ^ dim entries */ |
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68 int class_subbook[VIF_CLASS][8]; /* [VIF_CLASS][subs] */ |
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69 |
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70 |
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71 int mult; /* 1 2 3 or 4 */ |
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72 int postlist[VIF_POSIT+2]; /* first two implicit */ |
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73 |
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74 } vorbis_info_floor1; |
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75 |
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76 /* Residue backend generic *****************************************/ |
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77 typedef struct{ |
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78 vorbis_info_residue *(*unpack)(vorbis_info *,oggpack_buffer *); |
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79 vorbis_look_residue *(*look) (vorbis_dsp_state *,vorbis_info_mode *, |
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80 vorbis_info_residue *); |
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81 void (*free_info) (vorbis_info_residue *); |
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82 void (*free_look) (vorbis_look_residue *); |
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83 int (*inverse) (struct vorbis_block *,vorbis_look_residue *, |
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84 ogg_int32_t **,int *,int); |
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85 } vorbis_func_residue; |
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86 |
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87 typedef struct vorbis_info_residue0{ |
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88 /* block-partitioned VQ coded straight residue */ |
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89 long begin; |
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90 long end; |
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91 |
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92 /* first stage (lossless partitioning) */ |
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93 int grouping; /* group n vectors per partition */ |
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94 int partitions; /* possible codebooks for a partition */ |
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95 int groupbook; /* huffbook for partitioning */ |
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96 int secondstages[64]; /* expanded out to pointers in lookup */ |
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97 int booklist[256]; /* list of second stage books */ |
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98 } vorbis_info_residue0; |
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99 |
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100 /* Mapping backend generic *****************************************/ |
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101 typedef struct{ |
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102 vorbis_info_mapping *(*unpack)(vorbis_info *,oggpack_buffer *); |
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103 vorbis_look_mapping *(*look) (vorbis_dsp_state *,vorbis_info_mode *, |
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104 vorbis_info_mapping *); |
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105 void (*free_info) (vorbis_info_mapping *); |
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106 void (*free_look) (vorbis_look_mapping *); |
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107 int (*inverse) (struct vorbis_block *vb,vorbis_look_mapping *); |
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108 } vorbis_func_mapping; |
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109 |
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110 typedef struct vorbis_info_mapping0{ |
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111 int submaps; /* <= 16 */ |
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112 int chmuxlist[256]; /* up to 256 channels in a Vorbis stream */ |
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113 |
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114 int floorsubmap[16]; /* [mux] submap to floors */ |
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115 int residuesubmap[16]; /* [mux] submap to residue */ |
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116 |
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117 int psy[2]; /* by blocktype; impulse/padding for short, |
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118 transition/normal for long */ |
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119 |
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120 int coupling_steps; |
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121 int coupling_mag[256]; |
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122 int coupling_ang[256]; |
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123 } vorbis_info_mapping0; |
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124 |
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125 #endif |
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126 |
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127 |
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128 |
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129 |
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130 |