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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 244 | chris | 1 | /******************************************************************** |
| 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 1994-2003 * |
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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 | |||
| 14 | function: single-block PCM synthesis |
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| 15 | last mod: $Id: synthesis.c,v 1.1 2003/06/24 00:46:01 ace Exp $ |
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| 16 | |||
| 17 | ********************************************************************/ |
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| 18 | |||
| 19 | #include <stdio.h> |
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| 20 | #include "ogg.h" |
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| 21 | #include "ivorbiscodec.h" |
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| 22 | #include "codec_internal.h" |
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| 23 | #include "registry.h" |
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| 24 | #include "misc.h" |
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| 25 | #include "os.h" |
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| 26 | |||
| 27 | extern void *_vorbis_block_alloc(vorbis_block *vb,long bytes); |
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| 28 | |||
| 29 | int vorbis_synthesis(vorbis_block *vb,ogg_packet *op,int decodep){ |
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| 30 | vorbis_dsp_state *vd=vb->vd; |
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| 31 | private_state *b=(private_state *)vd->backend_state; |
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| 32 | vorbis_info *vi=vd->vi; |
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| 33 | codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
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| 34 | oggpack_buffer *opb=&vb->opb; |
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| 35 | int type,mode,i; |
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| 36 | |||
| 37 | /* first things first. Make sure decode is ready */ |
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| 38 | extern void _vorbis_block_ripcord(vorbis_block *vb); |
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| 39 | _vorbis_block_ripcord(vb); |
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| 40 | oggpack_readinit(opb,op->packet); |
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| 41 | |||
| 42 | /* Check the packet type */ |
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| 43 | if(oggpack_read(opb,1)!=0){ |
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| 44 | /* Oops. This is not an audio data packet */ |
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| 45 | return(OV_ENOTAUDIO); |
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| 46 | } |
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| 47 | |||
| 48 | /* read our mode and pre/post windowsize */ |
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| 49 | mode=oggpack_read(opb,b->modebits); |
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| 50 | if(mode==-1)return(OV_EBADPACKET); |
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| 51 | |||
| 52 | vb->mode=mode; |
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| 53 | vb->W=ci->mode_param[mode]->blockflag; |
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| 54 | if(vb->W){ |
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| 55 | vb->lW=oggpack_read(opb,1); |
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| 56 | vb->nW=oggpack_read(opb,1); |
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| 57 | if(vb->nW==-1) return(OV_EBADPACKET); |
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| 58 | }else{ |
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| 59 | vb->lW=0; |
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| 60 | vb->nW=0; |
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| 61 | } |
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| 62 | |||
| 63 | /* more setup */ |
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| 64 | vb->granulepos=op->granulepos; |
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| 65 | vb->sequence=op->packetno-3; /* first block is third packet */ |
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| 66 | vb->eofflag=op->e_o_s; |
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| 67 | |||
| 68 | if(decodep){ |
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| 69 | /* alloc pcm passback storage */ |
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| 70 | vb->pcmend=ci->blocksizes[vb->W]; |
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| 71 | vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); |
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| 72 | for(i=0;i<vi->channels;i++) |
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| 73 | vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); |
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| 74 | |||
| 75 | /* unpack_header enforces range checking */ |
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| 76 | type=ci->map_type[ci->mode_param[mode]->mapping]; |
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| 77 | |||
| 78 | return(_mapping_P[type]->inverse(vb,b->mode[mode])); |
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| 79 | }else{ |
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| 80 | /* no pcm */ |
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| 81 | vb->pcmend=0; |
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| 82 | vb->pcm=NULL; |
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| 83 | |||
| 84 | return(0); |
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| 85 | } |
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| 86 | } |
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| 87 | |||
| 88 | long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ |
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| 89 | codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
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| 90 | oggpack_buffer opb; |
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| 91 | int mode; |
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| 92 | |||
| 93 | oggpack_readinit(&opb,op->packet); |
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| 94 | |||
| 95 | /* Check the packet type */ |
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| 96 | if(oggpack_read(&opb,1)!=0){ |
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| 97 | /* Oops. This is not an audio data packet */ |
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| 98 | return(OV_ENOTAUDIO); |
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| 99 | } |
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| 100 | |||
| 101 | { |
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| 102 | int modebits=0; |
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| 103 | int v=ci->modes; |
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| 104 | while(v>1){ |
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| 105 | modebits++; |
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| 106 | v>>=1; |
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| 107 | } |
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| 108 | |||
| 109 | /* read our mode and pre/post windowsize */ |
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| 110 | mode=oggpack_read(&opb,modebits); |
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| 111 | } |
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| 112 | if(mode==-1)return(OV_EBADPACKET); |
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| 113 | return(ci->blocksizes[ci->mode_param[mode]->blockflag]); |
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| 114 | } |
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| 115 | |||
| 116 |