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comparison: media/libvorbis/lib/vorbis_synthesis.c
media/libvorbis/lib/vorbis_synthesis.c
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| 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: single-block PCM synthesis | |
| 14 last mod: $Id: synthesis.c 17474 2010-09-30 03:41:41Z gmaxwell $ | |
| 15 | |
| 16 ********************************************************************/ | |
| 17 | |
| 18 #include <stdio.h> | |
| 19 #include <ogg/ogg.h> | |
| 20 #include "vorbis/codec.h" | |
| 21 #include "codec_internal.h" | |
| 22 #include "registry.h" | |
| 23 #include "misc.h" | |
| 24 #include "os.h" | |
| 25 | |
| 26 int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){ | |
| 27 vorbis_dsp_state *vd= vb ? vb->vd : 0; | |
| 28 private_state *b= vd ? vd->backend_state : 0; | |
| 29 vorbis_info *vi= vd ? vd->vi : 0; | |
| 30 codec_setup_info *ci= vi ? vi->codec_setup : 0; | |
| 31 oggpack_buffer *opb=vb ? &vb->opb : 0; | |
| 32 int type,mode,i; | |
| 33 | |
| 34 if (!vd || !b || !vi || !ci || !opb) { | |
| 35 return OV_EBADPACKET; | |
| 36 } | |
| 37 | |
| 38 /* first things first. Make sure decode is ready */ | |
| 39 _vorbis_block_ripcord(vb); | |
| 40 oggpack_readinit(opb,op->packet,op->bytes); | |
| 41 | |
| 42 /* Check the packet type */ | |
| 43 if(oggpack_read(opb,1)!=0){ | |
| 44 /* Oops. This is not an audio data packet */ | |
| 45 return(OV_ENOTAUDIO); | |
| 46 } | |
| 47 | |
| 48 /* read our mode and pre/post windowsize */ | |
| 49 mode=oggpack_read(opb,b->modebits); | |
| 50 if(mode==-1){ | |
| 51 return(OV_EBADPACKET); | |
| 52 } | |
| 53 | |
| 54 vb->mode=mode; | |
| 55 if(!ci->mode_param[mode]){ | |
| 56 return(OV_EBADPACKET); | |
| 57 } | |
| 58 | |
| 59 vb->W=ci->mode_param[mode]->blockflag; | |
| 60 if(vb->W){ | |
| 61 | |
| 62 /* this doesn;t get mapped through mode selection as it's used | |
| 63 only for window selection */ | |
| 64 vb->lW=oggpack_read(opb,1); | |
| 65 vb->nW=oggpack_read(opb,1); | |
| 66 if(vb->nW==-1){ | |
| 67 return(OV_EBADPACKET); | |
| 68 } | |
| 69 }else{ | |
| 70 vb->lW=0; | |
| 71 vb->nW=0; | |
| 72 } | |
| 73 | |
| 74 /* more setup */ | |
| 75 vb->granulepos=op->granulepos; | |
| 76 vb->sequence=op->packetno; | |
| 77 vb->eofflag=op->e_o_s; | |
| 78 | |
| 79 /* alloc pcm passback storage */ | |
| 80 vb->pcmend=ci->blocksizes[vb->W]; | |
| 81 vb->pcm=_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); | |
| 82 for(i=0;i<vi->channels;i++) | |
| 83 vb->pcm[i]=_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); | |
| 84 | |
| 85 /* unpack_header enforces range checking */ | |
| 86 type=ci->map_type[ci->mode_param[mode]->mapping]; | |
| 87 | |
| 88 return(_mapping_P[type]->inverse(vb,ci->map_param[ci->mode_param[mode]-> | |
| 89 mapping])); | |
| 90 } | |
| 91 | |
| 92 /* used to track pcm position without actually performing decode. | |
| 93 Useful for sequential 'fast forward' */ | |
| 94 int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){ | |
| 95 vorbis_dsp_state *vd=vb->vd; | |
| 96 private_state *b=vd->backend_state; | |
| 97 vorbis_info *vi=vd->vi; | |
| 98 codec_setup_info *ci=vi->codec_setup; | |
| 99 oggpack_buffer *opb=&vb->opb; | |
| 100 int mode; | |
| 101 | |
| 102 /* first things first. Make sure decode is ready */ | |
| 103 _vorbis_block_ripcord(vb); | |
| 104 oggpack_readinit(opb,op->packet,op->bytes); | |
| 105 | |
| 106 /* Check the packet type */ | |
| 107 if(oggpack_read(opb,1)!=0){ | |
| 108 /* Oops. This is not an audio data packet */ | |
| 109 return(OV_ENOTAUDIO); | |
| 110 } | |
| 111 | |
| 112 /* read our mode and pre/post windowsize */ | |
| 113 mode=oggpack_read(opb,b->modebits); | |
| 114 if(mode==-1)return(OV_EBADPACKET); | |
| 115 | |
| 116 vb->mode=mode; | |
| 117 if(!ci->mode_param[mode]){ | |
| 118 return(OV_EBADPACKET); | |
| 119 } | |
| 120 | |
| 121 vb->W=ci->mode_param[mode]->blockflag; | |
| 122 if(vb->W){ | |
| 123 vb->lW=oggpack_read(opb,1); | |
| 124 vb->nW=oggpack_read(opb,1); | |
| 125 if(vb->nW==-1) return(OV_EBADPACKET); | |
| 126 }else{ | |
| 127 vb->lW=0; | |
| 128 vb->nW=0; | |
| 129 } | |
| 130 | |
| 131 /* more setup */ | |
| 132 vb->granulepos=op->granulepos; | |
| 133 vb->sequence=op->packetno; | |
| 134 vb->eofflag=op->e_o_s; | |
| 135 | |
| 136 /* no pcm */ | |
| 137 vb->pcmend=0; | |
| 138 vb->pcm=NULL; | |
| 139 | |
| 140 return(0); | |
| 141 } | |
| 142 | |
| 143 long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ | |
| 144 codec_setup_info *ci=vi->codec_setup; | |
| 145 oggpack_buffer opb; | |
| 146 int mode; | |
| 147 | |
| 148 oggpack_readinit(&opb,op->packet,op->bytes); | |
| 149 | |
| 150 /* Check the packet type */ | |
| 151 if(oggpack_read(&opb,1)!=0){ | |
| 152 /* Oops. This is not an audio data packet */ | |
| 153 return(OV_ENOTAUDIO); | |
| 154 } | |
| 155 | |
| 156 { | |
| 157 int modebits=0; | |
| 158 int v=ci->modes; | |
| 159 while(v>1){ | |
| 160 modebits++; | |
| 161 v>>=1; | |
| 162 } | |
| 163 | |
| 164 /* read our mode and pre/post windowsize */ | |
| 165 mode=oggpack_read(&opb,modebits); | |
| 166 } | |
| 167 if(mode==-1)return(OV_EBADPACKET); | |
| 168 return(ci->blocksizes[ci->mode_param[mode]->blockflag]); | |
| 169 } | |
| 170 | |
| 171 int vorbis_synthesis_halfrate(vorbis_info *vi,int flag){ | |
| 172 /* set / clear half-sample-rate mode */ | |
| 173 codec_setup_info *ci=vi->codec_setup; | |
| 174 | |
| 175 /* right now, our MDCT can't handle < 64 sample windows. */ | |
| 176 if(ci->blocksizes[0]<=64 && flag)return -1; | |
| 177 ci->halfrate_flag=(flag?1:0); | |
| 178 return 0; | |
| 179 } | |
| 180 | |
| 181 int vorbis_synthesis_halfrate_p(vorbis_info *vi){ | |
| 182 codec_setup_info *ci=vi->codec_setup; | |
| 183 return ci->halfrate_flag; | |
| 184 } |
