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132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/********************************************************************
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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/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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static int _vorbis_synthesis1(vorbis_block *vb,ogg_packet *op,int decodep){
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vorbis_dsp_state *vd= vb ? vb->vd : 0;
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private_state *b= vd ? (private_state *)vd->backend_state: 0;
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vorbis_info *vi= vd ? vd->vi : 0;
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codec_setup_info *ci= vi ? (codec_setup_info *)vi->codec_setup : 0;
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oggpack_buffer *opb=vb ? &vb->opb : 0;
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int type,mode,i;
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if (!vd || !b || !vi || !ci || !opb) {
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return OV_EBADPACKET;
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}
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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,op->bytes);
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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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if(!ci->mode_param[mode]){
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return(OV_EBADPACKET);
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}
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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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int vorbis_synthesis(vorbis_block *vb,ogg_packet *op){
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return _vorbis_synthesis1(vb,op,1);
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}
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/* used to track pcm position without actually performing decode.
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Useful for sequential 'fast forward' */
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int vorbis_synthesis_trackonly(vorbis_block *vb,ogg_packet *op){
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return _vorbis_synthesis1(vb,op,0);
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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,op->bytes);
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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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