/********************************************************************
* *
- * 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 1994-1999 *
- * by 1999 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
- author: Monty <xiphmont@mit.edu>
- modifications by: Monty
- last modification date: Aug 08 1999
********************************************************************/
-#include "codec.h"
-#include "envelope.h"
-#include "mdct.h"
-#include "lpc.h"
-#include "lsp.h"
+#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){
- int i;
- vorbis_info *vi=&vb->vd->vi;
- double *window=vb->vd->window[vb->W][vb->lW][vb->nW];
- lpc_lookup *vl=&vb->vd->vl[vb->W];
-
- /* get the LSP params back to LPC params. This will be for each
- spectral floor curve */
-
-
- /* {
- int scale=1020;
- double last=0;
- for(i=0;i<30;i++){
- last+=lsp1[i];
- lsp2[i]=last*M_PI/scale;
- }
- }
+ 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(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){
+
+ /* 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->granulepos=op->granulepos;
+ vb->sequence=op->packetno;
+ vb->eofflag=op->e_o_s;
+
+ /* alloc pcm passback storage */
+ 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(*vb->pcm[i]));
+
+ /* unpack_header enforces range checking */
+ type=ci->map_type[ci->mode_param[mode]->mapping];
+
+ 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;
- vorbis_lsp_to_lpc(lsp2,lpc1,30);*/
+ if(ci==NULL || ci->modes<=0){
+ /* codec setup not properly intialized */
+ return(OV_EFAULT);
+ }
+ oggpack_readinit(&opb,op->packet,op->bytes);
- /*for(i=0;i<vi->floorch;i++)
- vorbis_lsp_to_lpc(vb->lsp[i],vb->lpc[i],vi->floororder);*/
+ /* Check the packet type */
+ if(oggpack_read(&opb,1)!=0){
+ /* Oops. This is not an audio data packet */
+ return(OV_ENOTAUDIO);
+ }
- /* Map the resulting floors back to the appropriate channels */
+ /* 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]);
+}
- /*for(i=0;i<vi->channels;i++)
- vorbis_lpc_apply(vb->pcm[i],vb->pcmend,vb->lpc[vi->floormap[i]],
- vb->amp[vi->floormap[i]],vi->floororder);*/
-
- for(i=0;i<vb->pcm_channels;i++)
- mdct_backward(&vb->vd->vm[vb->W],vb->pcm[i],vb->pcm[i],window);
- _ve_envelope_apply(vb,1);
+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