412cdd6cf7
Use the windowing approach from ffmpeg in tremor, does the mdct doubling, windowing and overlap add in one go. Also uses less memory so all the processing buffers fit in iram on targets with small iram for the common blocksizes (256/2048) now. Speeds up decoding of vorbis files by 3MHz for 256/2048 and 20MHz for 512/4096 files on h300. Speeds up decoding of vorbis files by 3MHz for 256/2048 and 4.5MHz for 512/4096 on the beast. Speeds up decoding of vorbis files by 0.3MHz for 256/2048 and 1MHz for 512/4096 on c200v1. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30580 a1c6a512-1295-4272-9138-f99709370657
129 lines
3.7 KiB
C
129 lines
3.7 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: $Id$
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********************************************************************/
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#include <stdio.h>
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#include "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 "os.h"
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static inline 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;
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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 && vi->channels<=CHANNELS)
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{
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/* set pcm end point */
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vb->pcmend=ci->blocksizes[vb->W];
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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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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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ICODE_ATTR_TREMOR_NOT_MDCT;
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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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