author | nemo |
Mon, 10 Oct 2011 16:36:35 -0400 | |
changeset 6122 | 58ecb4fb743d |
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 1994-2003 * |
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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: single-block PCM synthesis |
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last mod: $Id: synthesis.c,v 1.4 2003/03/29 03:07:21 xiphmont Exp $ |
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********************************************************************/ |
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#include <stdio.h> |
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#include "ogg.h" |
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#include "ivorbiscodec.h" |
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#include "codec_internal.h" |
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#include "registry.h" |
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#include "misc.h" |
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#include "block.h" |
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int vorbis_synthesis(vorbis_block *vb,ogg_packet *op,int decodep){ |
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vorbis_dsp_state *vd=vb->vd; |
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private_state *b=(private_state *)vd->backend_state; |
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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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oggpack_buffer *opb=&vb->opb; |
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int type,mode,i; |
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/* first things first. Make sure decode is ready */ |
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_vorbis_block_ripcord(vb); |
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oggpack_readinit(opb,op->packet); |
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/* Check the packet type */ |
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if(oggpack_read(opb,1)!=0){ |
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/* Oops. This is not an audio data packet */ |
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return(OV_ENOTAUDIO); |
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} |
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/* read our mode and pre/post windowsize */ |
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mode=oggpack_read(opb,b->modebits); |
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if(mode==-1)return(OV_EBADPACKET); |
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vb->mode=mode; |
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vb->W=ci->mode_param[mode]->blockflag; |
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if(vb->W){ |
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vb->lW=oggpack_read(opb,1); |
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vb->nW=oggpack_read(opb,1); |
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if(vb->nW==-1) return(OV_EBADPACKET); |
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}else{ |
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vb->lW=0; |
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vb->nW=0; |
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} |
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/* more setup */ |
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vb->granulepos=op->granulepos; |
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vb->sequence=op->packetno-3; /* first block is third packet */ |
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vb->eofflag=op->e_o_s; |
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if(decodep){ |
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/* alloc pcm passback storage */ |
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vb->pcmend=ci->blocksizes[vb->W]; |
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vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); |
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for(i=0;i<vi->channels;i++) |
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vb->pcm[i]=(ogg_int32_t *)_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); |
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/* unpack_header enforces range checking */ |
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type=ci->map_type[ci->mode_param[mode]->mapping]; |
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return(_mapping_P[type]->inverse(vb,b->mode[mode])); |
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}else{ |
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/* no pcm */ |
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vb->pcmend=0; |
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vb->pcm=NULL; |
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return(0); |
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} |
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} |
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long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ |
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup; |
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oggpack_buffer opb; |
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int mode; |
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oggpack_readinit(&opb,op->packet); |
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/* Check the packet type */ |
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if(oggpack_read(&opb,1)!=0){ |
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/* Oops. This is not an audio data packet */ |
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return(OV_ENOTAUDIO); |
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} |
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{ |
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int modebits=0; |
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int v=ci->modes; |
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while(v>1){ |
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modebits++; |
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v>>=1; |
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} |
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/* read our mode and pre/post windowsize */ |
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mode=oggpack_read(&opb,modebits); |
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} |
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if(mode==-1)return(OV_EBADPACKET); |
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return(ci->blocksizes[ci->mode_param[mode]->blockflag]); |
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} |
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