X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=lib%2Fsynthesis.c;h=f55091ff4c7181959ed3aa876eb5b98465a81c99;hb=752f0cb5dc22dc7f5ce69c911265ad46cd5502d6;hp=00c90080b2d580d47e7e9860cc56b703344af970;hpb=2b112c76e8eddde0694b326df88e5926fbe1a25d;p=platform%2Fupstream%2Flibvorbis.git diff --git a/lib/synthesis.c b/lib/synthesis.c index 00c9008..f55091f 100644 --- a/lib/synthesis.c +++ b/lib/synthesis.c @@ -1,74 +1,184 @@ /******************************************************************** * * - * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. * - * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY * - * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. * - * PLEASE READ THESE TERMS DISTRIBUTING. * + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * * * - * THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000 * - * by Monty and The XIPHOPHORUS Company * - * http://www.xiph.org/ * + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 * + * by the Xiph.Org Foundation http://www.xiph.org/ * * * ******************************************************************** function: single-block PCM synthesis - last mod: $Id: synthesis.c,v 1.17 2000/07/07 00:53:10 xiphmont Exp $ + last mod: $Id$ ********************************************************************/ #include +#include #include "vorbis/codec.h" +#include "codec_internal.h" #include "registry.h" -#include "bitwise.h" #include "misc.h" #include "os.h" int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){ - vorbis_dsp_state *vd=vb->vd; - vorbis_info *vi=vd->vi; - oggpack_buffer *opb=&vb->opb; - int type,mode,i; - + vorbis_dsp_state *vd= vb ? vb->vd : 0; + private_state *b= vd ? vd->backend_state : 0; + vorbis_info *vi= vd ? vd->vi : 0; + codec_setup_info *ci= vi ? vi->codec_setup : 0; + oggpack_buffer *opb=vb ? &vb->opb : 0; + int type,mode,i; + + if (!vd || !b || !vi || !ci || !opb) { + return OV_EBADPACKET; + } + /* first things first. Make sure decode is ready */ _vorbis_block_ripcord(vb); - _oggpack_readinit(opb,op->packet,op->bytes); + oggpack_readinit(opb,op->packet,op->bytes); /* Check the packet type */ - if(_oggpack_read(opb,1)!=0){ + if(oggpack_read(opb,1)!=0){ /* Oops. This is not an audio data packet */ - return(-1); + return(OV_ENOTAUDIO); } /* read our mode and pre/post windowsize */ - mode=_oggpack_read(opb,vd->modebits); - if(mode==-1)return(-1); - + mode=oggpack_read(opb,b->modebits); + if(mode==-1){ + return(OV_EBADPACKET); + } + vb->mode=mode; - vb->W=vi->mode_param[mode]->blockflag; + if(!ci->mode_param[mode]){ + return(OV_EBADPACKET); + } + + vb->W=ci->mode_param[mode]->blockflag; if(vb->W){ - vb->lW=_oggpack_read(opb,1); - vb->nW=_oggpack_read(opb,1); - if(vb->nW==-1) return(-1); + + /* this doesn;t get mapped through mode selection as it's used + only for window selection */ + vb->lW=oggpack_read(opb,1); + vb->nW=oggpack_read(opb,1); + if(vb->nW==-1){ + return(OV_EBADPACKET); + } }else{ vb->lW=0; vb->nW=0; } - + /* more setup */ - vb->frameno=op->frameno; - vb->sequence=op->packetno-3; /* first block is third packet */ + vb->granulepos=op->granulepos; + vb->sequence=op->packetno; vb->eofflag=op->e_o_s; /* alloc pcm passback storage */ - vb->pcmend=vi->blocksizes[vb->W]; - vb->pcm=_vorbis_block_alloc(vb,sizeof(double *)*vi->channels); + vb->pcmend=ci->blocksizes[vb->W]; + vb->pcm=_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels); for(i=0;ichannels;i++) - vb->pcm[i]=_vorbis_block_alloc(vb,vb->pcmend*sizeof(double)); + vb->pcm[i]=_vorbis_block_alloc(vb,vb->pcmend*sizeof(*vb->pcm[i])); /* unpack_header enforces range checking */ - type=vi->map_type[vi->mode_param[mode]->mapping]; + type=ci->map_type[ci->mode_param[mode]->mapping]; - return(_mapping_P[type]->inverse(vb,vd->mode[mode])); + return(_mapping_P[type]->inverse(vb,ci->map_param[ci->mode_param[mode]-> + mapping])); } +/* used to track pcm position without actually performing decode. + Useful for sequential 'fast forward' */ +int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){ + vorbis_dsp_state *vd=vb->vd; + private_state *b=vd->backend_state; + vorbis_info *vi=vd->vi; + codec_setup_info *ci=vi->codec_setup; + oggpack_buffer *opb=&vb->opb; + int mode; + /* first things first. Make sure decode is ready */ + _vorbis_block_ripcord(vb); + oggpack_readinit(opb,op->packet,op->bytes); + + /* Check the packet type */ + if(oggpack_read(opb,1)!=0){ + /* Oops. This is not an audio data packet */ + return(OV_ENOTAUDIO); + } + + /* read our mode and pre/post windowsize */ + mode=oggpack_read(opb,b->modebits); + if(mode==-1)return(OV_EBADPACKET); + + vb->mode=mode; + if(!ci->mode_param[mode]){ + return(OV_EBADPACKET); + } + + vb->W=ci->mode_param[mode]->blockflag; + if(vb->W){ + vb->lW=oggpack_read(opb,1); + vb->nW=oggpack_read(opb,1); + if(vb->nW==-1) return(OV_EBADPACKET); + }else{ + vb->lW=0; + vb->nW=0; + } + + /* more setup */ + vb->granulepos=op->granulepos; + vb->sequence=op->packetno; + vb->eofflag=op->e_o_s; + + /* no pcm */ + vb->pcmend=0; + vb->pcm=NULL; + + return(0); +} + +long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){ + codec_setup_info *ci=vi->codec_setup; + oggpack_buffer opb; + int mode; + + oggpack_readinit(&opb,op->packet,op->bytes); + + /* Check the packet type */ + if(oggpack_read(&opb,1)!=0){ + /* Oops. This is not an audio data packet */ + return(OV_ENOTAUDIO); + } + + { + int modebits=0; + int v=ci->modes; + while(v>1){ + modebits++; + v>>=1; + } + + /* read our mode and pre/post windowsize */ + mode=oggpack_read(&opb,modebits); + } + if(mode==-1 || !ci->mode_param[mode])return(OV_EBADPACKET); + return(ci->blocksizes[ci->mode_param[mode]->blockflag]); +} + +int vorbis_synthesis_halfrate(vorbis_info *vi,int flag){ + /* set / clear half-sample-rate mode */ + codec_setup_info *ci=vi->codec_setup; + + /* right now, our MDCT can't handle < 64 sample windows. */ + if(ci->blocksizes[0]<=64 && flag)return -1; + ci->halfrate_flag=(flag?1:0); + return 0; +} + +int vorbis_synthesis_halfrate_p(vorbis_info *vi){ + codec_setup_info *ci=vi->codec_setup; + return ci->halfrate_flag; +}