author | sheepluva |
Wed, 28 Sep 2011 06:24:10 +0200 | |
changeset 6059 | ddf020d0941a |
parent 5170 | f7e49eff3708 |
permissions | -rw-r--r-- |
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/******************************************************************** |
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* * |
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * |
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* * |
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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* * |
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 * |
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * |
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* * |
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******************************************************************** |
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function: channel mapping 0 implementation |
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********************************************************************/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <math.h> |
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#include "ogg.h" |
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#include "ivorbiscodec.h" |
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#include "mdct.h" |
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#include "codec_internal.h" |
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#include "codebook.h" |
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#include "window.h" |
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#include "registry.h" |
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#include "misc.h" |
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/* simplistic, wasteful way of doing this (unique lookup for each |
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mode/submapping); there should be a central repository for |
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identical lookups. That will require minor work, so I'm putting it |
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off as low priority. |
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Why a lookup for each backend in a given mode? Because the |
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blocksize is set by the mode, and low backend lookups may require |
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parameters from other areas of the mode/mapping */ |
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typedef struct { |
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vorbis_info_mode *mode; |
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vorbis_info_mapping0 *map; |
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vorbis_look_floor **floor_look; |
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vorbis_look_residue **residue_look; |
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vorbis_func_floor **floor_func; |
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vorbis_func_residue **residue_func; |
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int ch; |
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long lastframe; /* if a different mode is called, we need to |
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invalidate decay */ |
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} vorbis_look_mapping0; |
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static void mapping0_free_info(vorbis_info_mapping *i){ |
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vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)i; |
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if(info){ |
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memset(info,0,sizeof(*info)); |
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_ogg_free(info); |
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} |
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} |
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static void mapping0_free_look(vorbis_look_mapping *look){ |
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int i; |
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vorbis_look_mapping0 *l=(vorbis_look_mapping0 *)look; |
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if(l){ |
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for(i=0;i<l->map->submaps;i++){ |
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l->floor_func[i]->free_look(l->floor_look[i]); |
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l->residue_func[i]->free_look(l->residue_look[i]); |
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} |
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_ogg_free(l->floor_func); |
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_ogg_free(l->residue_func); |
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_ogg_free(l->floor_look); |
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_ogg_free(l->residue_look); |
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memset(l,0,sizeof(*l)); |
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_ogg_free(l); |
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} |
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} |
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static vorbis_look_mapping *mapping0_look(vorbis_dsp_state *vd,vorbis_info_mode *vm, |
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vorbis_info_mapping *m){ |
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int i; |
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vorbis_info *vi=vd->vi; |
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
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vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)_ogg_calloc(1,sizeof(*look)); |
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vorbis_info_mapping0 *info=look->map=(vorbis_info_mapping0 *)m; |
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look->mode=vm; |
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look->floor_look=(vorbis_look_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_look)); |
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look->residue_look=(vorbis_look_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_look)); |
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look->floor_func=(vorbis_func_floor **)_ogg_calloc(info->submaps,sizeof(*look->floor_func)); |
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look->residue_func=(vorbis_func_residue **)_ogg_calloc(info->submaps,sizeof(*look->residue_func)); |
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for(i=0;i<info->submaps;i++){ |
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int floornum=info->floorsubmap[i]; |
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int resnum=info->residuesubmap[i]; |
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look->floor_func[i]=_floor_P[ci->floor_type[floornum]]; |
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look->floor_look[i]=look->floor_func[i]-> |
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look(vd,vm,ci->floor_param[floornum]); |
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look->residue_func[i]=_residue_P[ci->residue_type[resnum]]; |
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look->residue_look[i]=look->residue_func[i]-> |
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look(vd,vm,ci->residue_param[resnum]); |
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} |
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look->ch=vi->channels; |
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return(look); |
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} |
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static int ilog(unsigned int v){ |
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int ret=0; |
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if(v)--v; |
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while(v){ |
f7e49eff3708
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121 |
ret++; |
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122 |
v>>=1; |
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123 |
} |
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124 |
return(ret); |
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|
125 |
} |
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126 |
|
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127 |
/* also responsible for range checking */ |
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128 |
static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){ |
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129 |
int i; |
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130 |
vorbis_info_mapping0 *info=(vorbis_info_mapping0 *)_ogg_calloc(1,sizeof(*info)); |
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131 |
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
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132 |
memset(info,0,sizeof(*info)); |
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|
133 |
|
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134 |
if(oggpack_read(opb,1)) |
f7e49eff3708
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135 |
info->submaps=oggpack_read(opb,4)+1; |
f7e49eff3708
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|
136 |
else |
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137 |
info->submaps=1; |
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|
138 |
|
f7e49eff3708
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139 |
if(oggpack_read(opb,1)){ |
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140 |
info->coupling_steps=oggpack_read(opb,8)+1; |
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|
141 |
|
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142 |
for(i=0;i<info->coupling_steps;i++){ |
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143 |
int testM=info->coupling_mag[i]=oggpack_read(opb,ilog(vi->channels)); |
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144 |
int testA=info->coupling_ang[i]=oggpack_read(opb,ilog(vi->channels)); |
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145 |
|
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146 |
if(testM<0 || |
f7e49eff3708
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147 |
testA<0 || |
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148 |
testM==testA || |
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149 |
testM>=vi->channels || |
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150 |
testA>=vi->channels) goto err_out; |
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151 |
} |
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152 |
|
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153 |
} |
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154 |
|
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155 |
if(oggpack_read(opb,2)>0)goto err_out; /* 2,3:reserved */ |
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156 |
|
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157 |
if(info->submaps>1){ |
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158 |
for(i=0;i<vi->channels;i++){ |
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159 |
info->chmuxlist[i]=oggpack_read(opb,4); |
f7e49eff3708
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160 |
if(info->chmuxlist[i]>=info->submaps)goto err_out; |
f7e49eff3708
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|
161 |
} |
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|
162 |
} |
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|
163 |
for(i=0;i<info->submaps;i++){ |
f7e49eff3708
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|
164 |
int temp=oggpack_read(opb,8); |
f7e49eff3708
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165 |
if(temp>=ci->times)goto err_out; |
f7e49eff3708
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166 |
info->floorsubmap[i]=oggpack_read(opb,8); |
f7e49eff3708
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167 |
if(info->floorsubmap[i]>=ci->floors)goto err_out; |
f7e49eff3708
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168 |
info->residuesubmap[i]=oggpack_read(opb,8); |
f7e49eff3708
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|
169 |
if(info->residuesubmap[i]>=ci->residues)goto err_out; |
f7e49eff3708
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|
170 |
} |
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|
171 |
|
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|
172 |
return info; |
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|
173 |
|
f7e49eff3708
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diff
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|
174 |
err_out: |
f7e49eff3708
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|
175 |
mapping0_free_info(info); |
f7e49eff3708
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|
176 |
return(NULL); |
f7e49eff3708
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|
177 |
} |
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diff
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|
178 |
|
f7e49eff3708
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|
179 |
static int seq=0; |
f7e49eff3708
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|
180 |
static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){ |
f7e49eff3708
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|
181 |
vorbis_dsp_state *vd=vb->vd; |
f7e49eff3708
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182 |
vorbis_info *vi=vd->vi; |
f7e49eff3708
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|
183 |
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
f7e49eff3708
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|
184 |
private_state *b=(private_state *)vd->backend_state; |
f7e49eff3708
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|
185 |
vorbis_look_mapping0 *look=(vorbis_look_mapping0 *)l; |
f7e49eff3708
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186 |
vorbis_info_mapping0 *info=look->map; |
f7e49eff3708
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|
187 |
|
f7e49eff3708
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|
188 |
int i,j; |
f7e49eff3708
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|
189 |
long n=vb->pcmend=ci->blocksizes[vb->W]; |
f7e49eff3708
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diff
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|
190 |
|
f7e49eff3708
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|
191 |
ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels); |
f7e49eff3708
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|
192 |
int *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels); |
f7e49eff3708
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diff
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|
193 |
|
f7e49eff3708
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|
194 |
int *nonzero =(int *)alloca(sizeof(*nonzero)*vi->channels); |
f7e49eff3708
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|
195 |
void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels); |
f7e49eff3708
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|
196 |
|
f7e49eff3708
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|
197 |
/* time domain information decode (note that applying the |
f7e49eff3708
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|
198 |
information would have to happen later; we'll probably add a |
f7e49eff3708
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|
199 |
function entry to the harness for that later */ |
f7e49eff3708
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|
200 |
/* NOT IMPLEMENTED */ |
f7e49eff3708
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|
201 |
|
f7e49eff3708
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|
202 |
/* recover the spectral envelope; store it in the PCM vector for now */ |
f7e49eff3708
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|
203 |
for(i=0;i<vi->channels;i++){ |
f7e49eff3708
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|
204 |
int submap=info->chmuxlist[i]; |
f7e49eff3708
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|
205 |
floormemo[i]=look->floor_func[submap]-> |
f7e49eff3708
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|
206 |
inverse1(vb,look->floor_look[submap]); |
f7e49eff3708
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|
207 |
if(floormemo[i]) |
f7e49eff3708
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|
208 |
nonzero[i]=1; |
f7e49eff3708
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|
209 |
else |
f7e49eff3708
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|
210 |
nonzero[i]=0; |
f7e49eff3708
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|
211 |
memset(vb->pcm[i],0,sizeof(*vb->pcm[i])*n/2); |
f7e49eff3708
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|
212 |
} |
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|
213 |
|
f7e49eff3708
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|
214 |
/* channel coupling can 'dirty' the nonzero listing */ |
f7e49eff3708
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|
215 |
for(i=0;i<info->coupling_steps;i++){ |
f7e49eff3708
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|
216 |
if(nonzero[info->coupling_mag[i]] || |
f7e49eff3708
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|
217 |
nonzero[info->coupling_ang[i]]){ |
f7e49eff3708
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|
218 |
nonzero[info->coupling_mag[i]]=1; |
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219 |
nonzero[info->coupling_ang[i]]=1; |
f7e49eff3708
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220 |
} |
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|
221 |
} |
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|
222 |
|
f7e49eff3708
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|
223 |
/* recover the residue into our working vectors */ |
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|
224 |
for(i=0;i<info->submaps;i++){ |
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|
225 |
int ch_in_bundle=0; |
f7e49eff3708
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226 |
for(j=0;j<vi->channels;j++){ |
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227 |
if(info->chmuxlist[j]==i){ |
f7e49eff3708
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|
228 |
if(nonzero[j]) |
f7e49eff3708
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|
229 |
zerobundle[ch_in_bundle]=1; |
f7e49eff3708
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|
230 |
else |
f7e49eff3708
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|
231 |
zerobundle[ch_in_bundle]=0; |
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232 |
pcmbundle[ch_in_bundle++]=vb->pcm[j]; |
f7e49eff3708
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|
233 |
} |
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|
234 |
} |
f7e49eff3708
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|
235 |
|
f7e49eff3708
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|
236 |
look->residue_func[i]->inverse(vb,look->residue_look[i], |
f7e49eff3708
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|
237 |
pcmbundle,zerobundle,ch_in_bundle); |
f7e49eff3708
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|
238 |
} |
f7e49eff3708
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|
239 |
|
f7e49eff3708
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|
240 |
//for(j=0;j<vi->channels;j++) |
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//_analysis_output("coupled",seq+j,vb->pcm[j],-8,n/2,0,0); |
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/* channel coupling */ |
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for(i=info->coupling_steps-1;i>=0;i--){ |
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ogg_int32_t *pcmM=vb->pcm[info->coupling_mag[i]]; |
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ogg_int32_t *pcmA=vb->pcm[info->coupling_ang[i]]; |
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|
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for(j=0;j<n/2;j++){ |
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ogg_int32_t mag=pcmM[j]; |
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ogg_int32_t ang=pcmA[j]; |
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|
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if(mag>0) |
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if(ang>0){ |
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pcmM[j]=mag; |
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pcmA[j]=mag-ang; |
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}else{ |
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pcmA[j]=mag; |
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pcmM[j]=mag+ang; |
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} |
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else |
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if(ang>0){ |
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pcmM[j]=mag; |
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pcmA[j]=mag+ang; |
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}else{ |
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pcmA[j]=mag; |
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pcmM[j]=mag-ang; |
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} |
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} |
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} |
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//for(j=0;j<vi->channels;j++) |
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//_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0); |
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/* compute and apply spectral envelope */ |
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for(i=0;i<vi->channels;i++){ |
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ogg_int32_t *pcm=vb->pcm[i]; |
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int submap=info->chmuxlist[i]; |
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look->floor_func[submap]-> |
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inverse2(vb,look->floor_look[submap],floormemo[i],pcm); |
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} |
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|
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//for(j=0;j<vi->channels;j++) |
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//_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1); |
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/* transform the PCM data; takes PCM vector, vb; modifies PCM vector */ |
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/* only MDCT right now.... */ |
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for(i=0;i<vi->channels;i++){ |
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ogg_int32_t *pcm=vb->pcm[i]; |
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mdct_backward(n,pcm,pcm); |
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} |
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//for(j=0;j<vi->channels;j++) |
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//_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0); |
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|
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/* window the data */ |
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for(i=0;i<vi->channels;i++){ |
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ogg_int32_t *pcm=vb->pcm[i]; |
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if(nonzero[i]) |
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_vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW); |
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else |
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for(j=0;j<n;j++) |
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pcm[j]=0; |
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|
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} |
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|
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//for(j=0;j<vi->channels;j++) |
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//_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0); |
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|
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seq+=vi->channels; |
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/* all done! */ |
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return(0); |
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} |
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|
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/* export hooks */ |
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vorbis_func_mapping mapping0_exportbundle={ |
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&mapping0_unpack, |
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&mapping0_look, |
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&mapping0_free_info, |
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&mapping0_free_look, |
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&mapping0_inverse |
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}; |