mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-30 21:21:49 +01:00
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
|
/********************************************************************
|
||
|
|
* *
|
||
|
|
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
|
||
|
|
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
|
||
|
|
* *
|
||
|
|
********************************************************************
|
||
|
|
|
||
|
|
function: single-block PCM synthesis
|
||
|
|
last mod: $Id: synthesis.c,v 1.4 2003/03/29 03:07:21 xiphmont Exp $
|
||
|
|
|
||
|
|
********************************************************************/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include "ogg.h"
|
||
|
|
#include "ivorbiscodec.h"
|
||
|
|
#include "codec_internal.h"
|
||
|
|
#include "registry.h"
|
||
|
|
#include "misc.h"
|
||
|
|
#include "block.h"
|
||
|
|
|
||
|
|
int vorbis_synthesis(vorbis_block *vb,ogg_packet *op,int decodep){
|
||
|
|
vorbis_dsp_state *vd=vb->vd;
|
||
|
|
private_state *b=(private_state *)vd->backend_state;
|
||
|
|
vorbis_info *vi=vd->vi;
|
||
|
|
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
|
||
|
|
oggpack_buffer *opb=&vb->opb;
|
||
|
|
int type,mode,i;
|
||
|
|
|
||
|
|
/* first things first. Make sure decode is ready */
|
||
|
|
_vorbis_block_ripcord(vb);
|
||
|
|
oggpack_readinit(opb,op->packet);
|
||
|
|
|
||
|
|
/* 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;
|
||
|
|
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-3; /* first block is third packet */
|
||
|
|
vb->eofflag=op->e_o_s;
|
||
|
|
|
||
|
|
if(decodep){
|
||
|
|
/* alloc pcm passback storage */
|
||
|
|
vb->pcmend=ci->blocksizes[vb->W];
|
||
|
|
vb->pcm=(ogg_int32_t **)_vorbis_block_alloc(vb,sizeof(*vb->pcm)*vi->channels);
|
||
|
|
for(i=0;i<vi->channels;i++)
|
||
|
|
vb->pcm[i]=(ogg_int32_t *)_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,b->mode[mode]));
|
||
|
|
}else{
|
||
|
|
/* no pcm */
|
||
|
|
vb->pcmend=0;
|
||
|
|
vb->pcm=NULL;
|
||
|
|
|
||
|
|
return(0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
|
||
|
|
codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
|
||
|
|
oggpack_buffer opb;
|
||
|
|
int mode;
|
||
|
|
|
||
|
|
oggpack_readinit(&opb,op->packet);
|
||
|
|
|
||
|
|
/* 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)return(OV_EBADPACKET);
|
||
|
|
return(ci->blocksizes[ci->mode_param[mode]->blockflag]);
|
||
|
|
}
|
||
|
|
|
||
|
|
|