/********************************************************************
* *
- * 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 <monty@xiph.org> and The XIPHOPHORUS Company *
- * http://www.xiph.org/ *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
+ * by the Xiph.Org Foundation https://xiph.org/ *
* *
********************************************************************
function: single-block PCM synthesis
- last mod: $Id: synthesis.c,v 1.18 2000/10/12 03:12:54 xiphmont Exp $
********************************************************************/
#include <stdio.h>
#include <ogg/ogg.h>
#include "vorbis/codec.h"
+#include "codec_internal.h"
#include "registry.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);
/* Check the packet type */
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){
+
+ /* 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(-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-3; /* first block is third packet */
+ 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(float *)*vi->channels);
+ vb->pcmend=ci->blocksizes[vb->W];
+ vb->pcm=_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
for(i=0;i<vi->channels;i++)
- vb->pcm[i]=_vorbis_block_alloc(vb,vb->pcmend*sizeof(float));
+ 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;
+
+ if(ci==NULL || ci->modes<=0){
+ /* codec setup not properly intialized */
+ return(OV_EFAULT);
+ }
+
+ 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,ov_ilog(ci->modes-1));
+ 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;
+}
projects / platform / upstream / libvorbis.git / blobdiff