misc/libtremor/block.c
author koda
Wed, 26 Oct 2011 01:17:44 +0200
changeset 6210 923c8414e3af
parent 5170 f7e49eff3708
permissions -rw-r--r--
fix runtime compability with ios 3.* (hopefully) and fix a small glitch in turning off music/sounds
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/********************************************************************
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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.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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  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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      vorbis_book_init_decode(ci->fullbooks+i,ci->book_param[i]);
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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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}
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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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  _vds_init(v,vi);
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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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   297
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    /* overlap/add PCM */
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   299
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    for(j=0;j<vi->channels;j++){
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   301
      /* the overlap/add section */
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      if(v->lW){
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   303
	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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   309
	}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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   315
	}
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   316
      }else{
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   317
	if(v->W){
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   318
	  /* small/large */
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   319
	  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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   321
	  for(i=0;i<n0;i++)
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	    pcm[i]+=p[i];
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   323
	  for(;i<n1/2+n0/2;i++)
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   324
	    pcm[i]=p[i];
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   325
	}else{
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   326
	  /* small/small */
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   327
	  ogg_int32_t *pcm=v->pcm[j]+prevCenter;
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   328
	  ogg_int32_t *p=vb->pcm[j];
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   329
	  for(i=0;i<n0;i++)
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   330
	    pcm[i]+=p[i];
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   331
	}
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   332
      }
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   333
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   334
      /* the copy section */
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   335
      {
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   336
	ogg_int32_t *pcm=v->pcm[j]+thisCenter;
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   337
	ogg_int32_t *p=vb->pcm[j]+n;
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   338
	for(i=0;i<n;i++)
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   339
	  pcm[i]=p[i];
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   340
      }
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   341
    }
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diff changeset
   342
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diff changeset
   343
    if(v->centerW)
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   344
      v->centerW=0;
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   345
    else
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   346
      v->centerW=n1;
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diff changeset
   347
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   348
    /* deal with initial packet state; we do this using the explicit
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diff changeset
   349
       pcm_returned==-1 flag otherwise we're sensitive to first block
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   350
       being short or long */
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diff changeset
   351
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diff changeset
   352
    if(v->pcm_returned==-1){
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koda
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diff changeset
   353
      v->pcm_returned=thisCenter;
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diff changeset
   354
      v->pcm_current=thisCenter;
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diff changeset
   355
    }else{
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diff changeset
   356
      v->pcm_returned=prevCenter;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   357
      v->pcm_current=prevCenter+
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   358
	ci->blocksizes[v->lW]/4+
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   359
	ci->blocksizes[v->W]/4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   360
    }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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diff changeset
   361
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   362
  }
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diff changeset
   363
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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diff changeset
   364
  /* track the frame number... This is for convenience, but also
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   365
     making sure our last packet doesn't end with added padding.  If
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   366
     the last packet is partial, the number of samples we'll have to
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   367
     return will be past the vb->granulepos.
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   368
     
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   369
     This is not foolproof!  It will be confused if we begin
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   370
     decoding at the last page after a seek or hole.  In that case,
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   371
     we don't have a starting point to judge where the last frame
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   372
     is.  For this reason, vorbisfile will always try to make sure
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
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diff changeset
   373
     it reads the last two marked pages in proper sequence */
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koda
parents:
diff changeset
   374
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
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diff changeset
   375
  if(b->sample_count==-1){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   376
    b->sample_count=0;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   377
  }else{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   378
    b->sample_count+=ci->blocksizes[v->lW]/4+ci->blocksizes[v->W]/4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   379
  }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   380
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   381
  if(v->granulepos==-1){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   382
    if(vb->granulepos!=-1){ /* only set if we have a position to set to */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   383
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   384
      v->granulepos=vb->granulepos;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   385
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   386
      /* is this a short page? */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   387
      if(b->sample_count>v->granulepos){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   388
	/* corner case; if this is both the first and last audio page,
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   389
	   then spec says the end is cut, not beginning */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   390
	if(vb->eofflag){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   391
	  /* trim the end */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   392
	  /* no preceeding granulepos; assume we started at zero (we'd
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   393
	     have to in a short single-page stream) */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   394
	  /* granulepos could be -1 due to a seek, but that would result
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   395
	     in a long coun`t, not short count */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   396
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   397
	  v->pcm_current-=(b->sample_count-v->granulepos);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   398
	}else{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   399
	  /* trim the beginning */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   400
	  v->pcm_returned+=(b->sample_count-v->granulepos);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   401
	  if(v->pcm_returned>v->pcm_current)
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   402
	    v->pcm_returned=v->pcm_current;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   403
	}
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   404
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   405
      }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   406
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   407
    }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   408
  }else{
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   409
    v->granulepos+=ci->blocksizes[v->lW]/4+ci->blocksizes[v->W]/4;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   410
    if(vb->granulepos!=-1 && v->granulepos!=vb->granulepos){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   411
      
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   412
      if(v->granulepos>vb->granulepos){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   413
	long extra=v->granulepos-vb->granulepos;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   414
	
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   415
	if(extra)
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   416
	  if(vb->eofflag){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   417
	    /* partial last frame.  Strip the extra samples off */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   418
	    v->pcm_current-=extra;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   419
	  } /* else {Shouldn't happen *unless* the bitstream is out of
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   420
	       spec.  Either way, believe the bitstream } */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   421
      } /* else {Shouldn't happen *unless* the bitstream is out of
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   422
	   spec.  Either way, believe the bitstream } */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   423
      v->granulepos=vb->granulepos;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   424
    }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   425
  }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   426
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   427
  /* Update, cleanup */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   428
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   429
  if(vb->eofflag)v->eofflag=1;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   430
  return(0);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   431
}
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   432
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   433
/* pcm==NULL indicates we just want the pending samples, no more */
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   434
int vorbis_synthesis_pcmout(vorbis_dsp_state *v,ogg_int32_t ***pcm){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   435
  vorbis_info *vi=v->vi;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   436
  if(v->pcm_returned>-1 && v->pcm_returned<v->pcm_current){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   437
    if(pcm){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   438
      int i;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   439
      for(i=0;i<vi->channels;i++)
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   440
	v->pcmret[i]=v->pcm[i]+v->pcm_returned;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   441
      *pcm=v->pcmret;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   442
    }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   443
    return(v->pcm_current-v->pcm_returned);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   444
  }
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   445
  return(0);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   446
}
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   447
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   448
int vorbis_synthesis_read(vorbis_dsp_state *v,int bytes){
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   449
  if(bytes && v->pcm_returned+bytes>v->pcm_current)return(OV_EINVAL);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   450
  v->pcm_returned+=bytes;
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   451
  return(0);
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   452
}
f7e49eff3708 add libTremor sources (integer-only libvorbis implementation) to repo and ios project
koda
parents:
diff changeset
   453