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comparison: media/libtremor/lib/tremor_synthesis.c
media/libtremor/lib/tremor_synthesis.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:c3a2186f11c2 |
|---|---|
| 1 /******************************************************************** | |
| 2 * * | |
| 3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. * | |
| 4 * * | |
| 5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * | |
| 6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * | |
| 7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * | |
| 8 * * | |
| 9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 * | |
| 10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ * | |
| 11 * * | |
| 12 ******************************************************************** | |
| 13 | |
| 14 function: single-block PCM synthesis | |
| 15 last mod: $Id: synthesis.c,v 1.4 2003/03/29 03:07:21 xiphmont Exp $ | |
| 16 | |
| 17 ********************************************************************/ | |
| 18 | |
| 19 #include <stdio.h> | |
| 20 #include <ogg/ogg.h> | |
| 21 #include "ivorbiscodec.h" | |
| 22 #include "codec_internal.h" | |
| 23 #include "registry.h" | |
| 24 #include "misc.h" | |
| 25 #include "block.h" | |
| 26 | |
| 27 static int _vorbis_synthesis1(vorbis_block *vb,ogg_packet *op,int decodep){ | |
| 28 vorbis_dsp_state *vd= vb ? vb->vd : 0; | |
| 29 private_state *b= vd ? (private_state *)vd->backend_state: 0; | |
| 30 vorbis_info *vi= vd ? vd->vi : 0; | |
| 31 codec_setup_info *ci= vi ? (codec_setup_info *)vi->codec_setup : 0; | |
| 32 oggpack_buffer *opb=vb ? &vb->opb : 0; | |
| 33 int type,mode,i; | |
| 34 | |
| 35 if (!vd || !b || !vi || !ci || !opb) { | |
| 36 return OV_EBADPACKET; | |
| 37 } | |
| 38 | |
| 39 /* first things first. Make sure decode is ready */ | |
| 40 _vorbis_block_ripcord(vb); | |
| 41 oggpack_readinit(opb,op->packet,op->bytes); | |
| 42 | |
| 43 /* Check the packet type */ | |
| 44 if(oggpack_read(opb,1)!=0){ | |
| 45 /* Oops. This is not an audio data packet */ | |
| 46 return(OV_ENOTAUDIO); | |
| 47 } | |
| 48 | |
| 49 /* read our mode and pre/post windowsize */ | |
| 50 mode=oggpack_read(opb,b->modebits); | |
| 51 if(mode==-1)return(OV_EBADPACKET); | |
| 52 | |
| 53 vb->mode=mode; | |
| 54 if(!ci->mode_param[mode]){ | |
| 55 return(OV_EBADPACKET); | |
| 56 } | |
| 57 | |
| 58 vb->W=ci->mode_param[mode]->blockflag; | |
| 59 if(vb->W){ | |
| 60 vb->lW=oggpack_read(opb,1); | |
| 61 vb->nW=oggpack_read(opb,1); | |
| 62 if(vb->nW==-1) return(OV_EBADPACKET); | |
| 63 }else{ | |
| 64 vb->lW=0; | |
| 65 vb->nW=0; | |
| 66 } | |
| 67 | |
| 68 /* more setup */ | |
| 69 vb->granulepos=op->granulepos; | |
| 70 vb->sequence=op->packetno-3; /* first block is third packet */ | |
| 71 vb->eofflag=op->e_o_s; | |
| 72 | |
| 73 if(decodep){ | |
| 74 /* alloc pcm passback storage */ | |
| 75 vb->pcmend=ci->blocksizes[vb->W]; | |
| 76 vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); | |
| 77 for(i=0;i<vi->channels;i++) | |
| 78 vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); | |
| 79 | |
| 80 /* unpack_header enforces range checking */ | |
| 81 type=ci->map_type[ci->mode_param[mode]->mapping]; | |
| 82 | |
| 83 return(_mapping_P[type]->inverse(vb,b->mode[mode])); | |
| 84 }else{ | |
| 85 /* no pcm */ | |
| 86 vb->pcmend=0; | |
| 87 vb->pcm=NULL; | |
| 88 | |
| 89 return(0); | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){ | |
| 94 return _vorbis_synthesis1(vb,op,1); | |
| 95 } | |
| 96 | |
| 97 /* used to track pcm position without actually performing decode. | |
| 98 Useful for sequential 'fast forward' */ | |
| 99 int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){ | |
| 100 return _vorbis_synthesis1(vb,op,0); | |
| 101 } | |
| 102 | |
| 103 long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ | |
| 104 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; | |
| 105 oggpack_buffer opb; | |
| 106 int mode; | |
| 107 | |
| 108 oggpack_readinit(&opb,op->packet,op->bytes); | |
| 109 | |
| 110 /* Check the packet type */ | |
| 111 if(oggpack_read(&opb,1)!=0){ | |
| 112 /* Oops. This is not an audio data packet */ | |
| 113 return(OV_ENOTAUDIO); | |
| 114 } | |
| 115 | |
| 116 { | |
| 117 int modebits=0; | |
| 118 int v=ci->modes; | |
| 119 while(v>1){ | |
| 120 modebits++; | |
| 121 v>>=1; | |
| 122 } | |
| 123 | |
| 124 /* read our mode and pre/post windowsize */ | |
| 125 mode=oggpack_read(&opb,modebits); | |
| 126 } | |
| 127 if(mode==-1)return(OV_EBADPACKET); | |
| 128 return(ci->blocksizes[ci->mode_param[mode]->blockflag]); | |
| 129 } | |
| 130 | |
| 131 |
