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498 lines
14 KiB
C
498 lines
14 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 1994-2002 *
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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: PCM data vector blocking, windowing and dis/reassembly
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********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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 "window.h"
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#include "registry.h"
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#include "misc.h"
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static int ilog(unsigned int v){
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int ret=0;
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if(v)--v;
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while(v){
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ret++;
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v>>=1;
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}
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return(ret);
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}
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/* pcm accumulator examples (not exhaustive):
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<-------------- lW ---------------->
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<--------------- W ---------------->
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: .....|..... _______________ |
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: .''' | '''_--- | |\ |
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:.....''' |_____--- '''......| | \_______|
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:.................|__________________|_______|__|______|
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|<------ Sl ------>| > Sr < |endW
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|beginSl |endSl | |endSr
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|beginW |endlW |beginSr
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|< lW >|
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<--------------- W ---------------->
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| | .. ______________ |
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| | ' `/ | ---_ |
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|___.'___/`. | ---_____|
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|_______|__|_______|_________________|
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| >|Sl|< |<------ Sr ----->|endW
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| | |endSl |beginSr |endSr
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|beginW | |endlW
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mult[0] |beginSl mult[n]
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<-------------- lW ----------------->
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|<--W-->|
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: .............. ___ | |
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: .''' |`/ \ | |
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:.....''' |/`....\|...|
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:.........................|___|___|___|
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|Sl |Sr |endW
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| | |endSr
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| |beginSr
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| |endSl
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|beginSl
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|beginW
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*/
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/* block abstraction setup *********************************************/
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#ifndef WORD_ALIGN
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#define WORD_ALIGN 8
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#endif
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int vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb){
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memset(vb,0,sizeof(*vb));
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vb->vd=v;
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vb->localalloc=0;
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vb->localstore=NULL;
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return(0);
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}
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void *_vorbis_block_alloc(vorbis_block *vb,long bytes){
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bytes=(bytes+(WORD_ALIGN-1)) & ~(WORD_ALIGN-1);
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if(bytes+vb->localtop>vb->localalloc){
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/* can't just _ogg_realloc... there are outstanding pointers */
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if(vb->localstore){
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struct alloc_chain *link=(struct alloc_chain *)_ogg_malloc(sizeof(*link));
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vb->totaluse+=vb->localtop;
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link->next=vb->reap;
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link->ptr=vb->localstore;
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vb->reap=link;
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}
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/* highly conservative */
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vb->localalloc=bytes;
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vb->localstore=_ogg_malloc(vb->localalloc);
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vb->localtop=0;
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}
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{
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void *ret=(void *)(((char *)vb->localstore)+vb->localtop);
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vb->localtop+=bytes;
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return ret;
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}
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}
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/* reap the chain, pull the ripcord */
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void _vorbis_block_ripcord(vorbis_block *vb){
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/* reap the chain */
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struct alloc_chain *reap=vb->reap;
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while(reap){
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struct alloc_chain *next=reap->next;
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_ogg_free(reap->ptr);
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memset(reap,0,sizeof(*reap));
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_ogg_free(reap);
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reap=next;
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}
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/* consolidate storage */
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if(vb->totaluse){
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vb->localstore=_ogg_realloc(vb->localstore,vb->totaluse+vb->localalloc);
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vb->localalloc+=vb->totaluse;
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vb->totaluse=0;
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}
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/* pull the ripcord */
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vb->localtop=0;
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vb->reap=NULL;
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}
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int vorbis_block_clear(vorbis_block *vb){
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_vorbis_block_ripcord(vb);
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if(vb->localstore)_ogg_free(vb->localstore);
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memset(vb,0,sizeof(*vb));
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return(0);
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}
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static int _vds_init(vorbis_dsp_state *v,vorbis_info *vi){
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int i;
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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private_state *b=NULL;
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if(ci==NULL) return 1;
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memset(v,0,sizeof(*v));
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b=(private_state *)(v->backend_state=_ogg_calloc(1,sizeof(*b)));
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v->vi=vi;
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b->modebits=ilog(ci->modes);
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/* Vorbis I uses only window type 0 */
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b->window[0]=_vorbis_window(0,ci->blocksizes[0]/2);
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b->window[1]=_vorbis_window(0,ci->blocksizes[1]/2);
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/* finish the codebooks */
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if(!ci->fullbooks){
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ci->fullbooks=(codebook *)_ogg_calloc(ci->books,sizeof(*ci->fullbooks));
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for(i=0;i<ci->books;i++){
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if(ci->book_param[i]==NULL)
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goto abort_books;
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if(vorbis_book_init_decode(ci->fullbooks+i,ci->book_param[i]))
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goto abort_books;
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/* decode codebooks are now standalone after init */
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vorbis_staticbook_destroy(ci->book_param[i]);
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ci->book_param[i]=NULL;
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}
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}
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v->pcm_storage=ci->blocksizes[1];
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v->pcm=(ogg_int32_t **)_ogg_malloc(vi->channels*sizeof(*v->pcm));
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v->pcmret=(ogg_int32_t **)_ogg_malloc(vi->channels*sizeof(*v->pcmret));
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for(i=0;i<vi->channels;i++)
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v->pcm[i]=(ogg_int32_t *)_ogg_calloc(v->pcm_storage,sizeof(*v->pcm[i]));
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/* all 1 (large block) or 0 (small block) */
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/* explicitly set for the sake of clarity */
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v->lW=0; /* previous window size */
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v->W=0; /* current window size */
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/* initialize all the mapping/backend lookups */
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b->mode=(vorbis_look_mapping **)_ogg_calloc(ci->modes,sizeof(*b->mode));
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for(i=0;i<ci->modes;i++){
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int mapnum=ci->mode_param[i]->mapping;
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int maptype=ci->map_type[mapnum];
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b->mode[i]=_mapping_P[maptype]->look(v,ci->mode_param[i],
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ci->map_param[mapnum]);
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}
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return 0;
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abort_books:
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for(i=0;i<ci->books;i++){
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if(ci->book_param[i]!=NULL){
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vorbis_staticbook_destroy(ci->book_param[i]);
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ci->book_param[i]=NULL;
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}
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}
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vorbis_dsp_clear(v);
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return -1;
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}
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int vorbis_synthesis_restart(vorbis_dsp_state *v){
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vorbis_info *vi=v->vi;
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codec_setup_info *ci;
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if(!v->backend_state)return -1;
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if(!vi)return -1;
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ci=vi->codec_setup;
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if(!ci)return -1;
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v->centerW=ci->blocksizes[1]/2;
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v->pcm_current=v->centerW;
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v->pcm_returned=-1;
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v->granulepos=-1;
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v->sequence=-1;
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((private_state *)(v->backend_state))->sample_count=-1;
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return(0);
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}
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int vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi){
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if(_vds_init(v,vi))return 1;
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vorbis_synthesis_restart(v);
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return 0;
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}
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void vorbis_dsp_clear(vorbis_dsp_state *v){
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int i;
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if(v){
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vorbis_info *vi=v->vi;
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codec_setup_info *ci=(codec_setup_info *)(vi?vi->codec_setup:NULL);
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private_state *b=(private_state *)v->backend_state;
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if(v->pcm){
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for(i=0;i<vi->channels;i++)
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if(v->pcm[i])_ogg_free(v->pcm[i]);
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_ogg_free(v->pcm);
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if(v->pcmret)_ogg_free(v->pcmret);
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}
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/* free mode lookups; these are actually vorbis_look_mapping structs */
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if(ci){
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for(i=0;i<ci->modes;i++){
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int mapnum=ci->mode_param[i]->mapping;
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int maptype=ci->map_type[mapnum];
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if(b && b->mode)_mapping_P[maptype]->free_look(b->mode[i]);
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}
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}
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if(b){
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if(b->mode)_ogg_free(b->mode);
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_ogg_free(b);
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}
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memset(v,0,sizeof(*v));
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}
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}
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/* Unlike in analysis, the window is only partially applied for each
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block. The time domain envelope is not yet handled at the point of
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calling (as it relies on the previous block). */
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int vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb){
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vorbis_info *vi=v->vi;
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codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
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private_state *b=v->backend_state;
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int i,j;
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if(v->pcm_current>v->pcm_returned && v->pcm_returned!=-1)return(OV_EINVAL);
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v->lW=v->W;
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v->W=vb->W;
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v->nW=-1;
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if((v->sequence==-1)||
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(v->sequence+1 != vb->sequence)){
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v->granulepos=-1; /* out of sequence; lose count */
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b->sample_count=-1;
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}
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v->sequence=vb->sequence;
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if(vb->pcm){ /* no pcm to process if vorbis_synthesis_trackonly
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was called on block */
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int n=ci->blocksizes[v->W]/2;
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int n0=ci->blocksizes[0]/2;
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int n1=ci->blocksizes[1]/2;
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int thisCenter;
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int prevCenter;
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if(v->centerW){
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thisCenter=n1;
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prevCenter=0;
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}else{
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thisCenter=0;
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prevCenter=n1;
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}
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/* v->pcm is now used like a two-stage double buffer. We don't want
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to have to constantly shift *or* adjust memory usage. Don't
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accept a new block until the old is shifted out */
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/* overlap/add PCM */
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for(j=0;j<vi->channels;j++){
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/* the overlap/add section */
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if(v->lW){
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if(v->W){
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/* large/large */
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ogg_int32_t *pcm=v->pcm[j]+prevCenter;
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ogg_int32_t *p=vb->pcm[j];
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for(i=0;i<n1;i++)
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pcm[i]+=p[i];
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}else{
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/* large/small */
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ogg_int32_t *pcm=v->pcm[j]+prevCenter+n1/2-n0/2;
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ogg_int32_t *p=vb->pcm[j];
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for(i=0;i<n0;i++)
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pcm[i]+=p[i];
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}
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}else{
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if(v->W){
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/* small/large */
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ogg_int32_t *pcm=v->pcm[j]+prevCenter;
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ogg_int32_t *p=vb->pcm[j]+n1/2-n0/2;
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for(i=0;i<n0;i++)
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pcm[i]+=p[i];
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for(;i<n1/2+n0/2;i++)
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pcm[i]=p[i];
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}else{
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/* small/small */
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ogg_int32_t *pcm=v->pcm[j]+prevCenter;
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ogg_int32_t *p=vb->pcm[j];
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for(i=0;i<n0;i++)
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pcm[i]+=p[i];
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}
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}
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/* the copy section */
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{
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ogg_int32_t *pcm=v->pcm[j]+thisCenter;
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ogg_int32_t *p=vb->pcm[j]+n;
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for(i=0;i<n;i++)
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pcm[i]=p[i];
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}
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}
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if(v->centerW)
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v->centerW=0;
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else
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v->centerW=n1;
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/* deal with initial packet state; we do this using the explicit
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pcm_returned==-1 flag otherwise we're sensitive to first block
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being short or long */
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if(v->pcm_returned==-1){
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v->pcm_returned=thisCenter;
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v->pcm_current=thisCenter;
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}else{
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v->pcm_returned=prevCenter;
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v->pcm_current=prevCenter+
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ci->blocksizes[v->lW]/4+
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ci->blocksizes[v->W]/4;
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}
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}
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/* track the frame number... This is for convenience, but also
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making sure our last packet doesn't end with added padding. If
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the last packet is partial, the number of samples we'll have to
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return will be past the vb->granulepos.
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This is not foolproof! It will be confused if we begin
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decoding at the last page after a seek or hole. In that case,
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we don't have a starting point to judge where the last frame
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is. For this reason, vorbisfile will always try to make sure
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it reads the last two marked pages in proper sequence */
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if(b->sample_count==-1){
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b->sample_count=0;
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}else{
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b->sample_count+=ci->blocksizes[v->lW]/4+ci->blocksizes[v->W]/4;
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}
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if(v->granulepos==-1){
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if(vb->granulepos!=-1){ /* only set if we have a position to set to */
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v->granulepos=vb->granulepos;
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/* is this a short page? */
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if(b->sample_count>v->granulepos){
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/* corner case; if this is both the first and last audio page,
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then spec says the end is cut, not beginning */
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long extra=b->sample_count-vb->granulepos;
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/* we use ogg_int64_t for granule positions because a
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uint64 isn't universally available. Unfortunately,
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that means granposes can be 'negative' and result in
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extra being negative */
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if(extra<0)
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extra=0;
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if(vb->eofflag){
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/* trim the end */
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/* no preceeding granulepos; assume we started at zero (we'd
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have to in a short single-page stream) */
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/* granulepos could be -1 due to a seek, but that would result
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in a long coun`t, not short count */
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/* Guard against corrupt/malicious frames that set EOP and
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a backdated granpos; don't rewind more samples than we
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actually have */
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if(extra > v->pcm_current - v->pcm_returned)
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extra = v->pcm_current - v->pcm_returned;
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v->pcm_current-=extra;
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}else{
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/* trim the beginning */
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v->pcm_returned+=extra;
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if(v->pcm_returned>v->pcm_current)
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v->pcm_returned=v->pcm_current;
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}
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}
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}
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}else{
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v->granulepos+=ci->blocksizes[v->lW]/4+ci->blocksizes[v->W]/4;
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if(vb->granulepos!=-1 && v->granulepos!=vb->granulepos){
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if(v->granulepos>vb->granulepos){
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long extra=v->granulepos-vb->granulepos;
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if(extra)
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if(vb->eofflag){
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/* partial last frame. Strip the extra samples off */
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/* Guard against corrupt/malicious frames that set EOP and
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a backdated granpos; don't rewind more samples than we
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actually have */
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if(extra > v->pcm_current - v->pcm_returned)
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extra = v->pcm_current - v->pcm_returned;
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/* we use ogg_int64_t for granule positions because a
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uint64 isn't universally available. Unfortunately,
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that means granposes can be 'negative' and result in
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extra being negative */
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if(extra<0)
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extra=0;
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v->pcm_current-=extra;
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} /* else {Shouldn't happen *unless* the bitstream is out of
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spec. Either way, believe the bitstream } */
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} /* else {Shouldn't happen *unless* the bitstream is out of
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spec. Either way, believe the bitstream } */
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v->granulepos=vb->granulepos;
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}
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}
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/* Update, cleanup */
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if(vb->eofflag)v->eofflag=1;
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return(0);
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}
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/* pcm==NULL indicates we just want the pending samples, no more */
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int vorbis_synthesis_pcmout(vorbis_dsp_state *v,ogg_int32_t ***pcm){
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vorbis_info *vi=v->vi;
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if(v->pcm_returned>-1 && v->pcm_returned<v->pcm_current){
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if(pcm){
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int i;
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for(i=0;i<vi->channels;i++)
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v->pcmret[i]=v->pcm[i]+v->pcm_returned;
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*pcm=v->pcmret;
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}
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return(v->pcm_current-v->pcm_returned);
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}
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return(0);
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}
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int vorbis_synthesis_read(vorbis_dsp_state *v,int bytes){
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if(bytes && v->pcm_returned+bytes>v->pcm_current)return(OV_EINVAL);
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v->pcm_returned+=bytes;
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return(0);
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}
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