Chris@1: /********************************************************************
Chris@1:  *                                                                  *
Chris@1:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
Chris@1:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
Chris@1:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
Chris@1:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
Chris@1:  *                                                                  *
Chris@1:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
Chris@1:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
Chris@1:  *                                                                  *
Chris@1:  ********************************************************************
Chris@1: 
Chris@1:  function: illustrate seeking, and test it too
Chris@1:  last mod: $Id: seeking_example.c 17561 2010-10-23 10:34:24Z xiphmont $
Chris@1: 
Chris@1:  ********************************************************************/
Chris@1: 
Chris@1: #include <stdlib.h>
Chris@1: #include <stdio.h>
Chris@1: #include "vorbis/codec.h"
Chris@1: #include "vorbis/vorbisfile.h"
Chris@1: 
Chris@1: #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
Chris@1: # include <io.h>
Chris@1: # include <fcntl.h>
Chris@1: #endif
Chris@1: 
Chris@1: void _verify(OggVorbis_File *ov,
Chris@1:              ogg_int64_t val,ogg_int64_t pcmval,double timeval,
Chris@1:              ogg_int64_t pcmlength,
Chris@1:              char *bigassbuffer){
Chris@1:   off_t i;
Chris@1:   int j;
Chris@1:   long bread;
Chris@1:   char buffer[4096];
Chris@1:   int dummy;
Chris@1:   ogg_int64_t pos;
Chris@1:   int hs = ov_halfrate_p(ov);
Chris@1: 
Chris@1:   /* verify the raw position, the pcm position and position decode */
Chris@1:   if(val!=-1 && ov_raw_tell(ov)<val){
Chris@1:     fprintf(stderr,"raw position out of tolerance: requested %ld, got %ld\n",
Chris@1:            (long)val,(long)ov_raw_tell(ov));
Chris@1:     exit(1);
Chris@1:   }
Chris@1:   if(pcmval!=-1 && ov_pcm_tell(ov)>pcmval){
Chris@1:     fprintf(stderr,"pcm position out of tolerance: requested %ld, got %ld\n",
Chris@1:            (long)pcmval,(long)ov_pcm_tell(ov));
Chris@1:     exit(1);
Chris@1:   }
Chris@1:   if(timeval!=-1 && ov_time_tell(ov)>timeval){
Chris@1:     fprintf(stderr,"time position out of tolerance: requested %f, got %f\n",
Chris@1:            timeval,ov_time_tell(ov));
Chris@1:     exit(1);
Chris@1:   }
Chris@1:   pos=ov_pcm_tell(ov);
Chris@1:   if(pos<0 || pos>pcmlength){
Chris@1:     fprintf(stderr,"pcm position out of bounds: got %ld\n",(long)pos);
Chris@1:     exit(1);
Chris@1:   }
Chris@1:   bread=ov_read(ov,buffer,4096,1,1,1,&dummy);
Chris@1:   for(j=0;j<bread;j++){
Chris@1:     if(buffer[j]!=bigassbuffer[j+((pos>>hs)*2)]){
Chris@1:       fprintf(stderr,"data after seek doesn't match declared pcm position %ld\n",(long)pos);
Chris@1: 
Chris@1:       for(i=0;i<(pcmlength>>hs)*2-bread;i++){
Chris@1:         for(j=0;j<bread;j++)
Chris@1:           if(buffer[j] != bigassbuffer[i+j])break;
Chris@1:         if(j==bread){
Chris@1:           fprintf(stderr,"data after seek appears to match position %ld\n",(long)((i/2)<<hs));
Chris@1:         }
Chris@1:       }
Chris@1:       {
Chris@1:         FILE *f=fopen("a.m","w");
Chris@1:         for(j=0;j<bread;j++)fprintf(f,"%d %d\n",j,(int)buffer[j]);
Chris@1:         fclose(f);
Chris@1:         f=fopen("b.m","w");
Chris@1:         for(j=-4096;j<bread+4096;j++)
Chris@1:           if(j+((pos*2)>>hs)>=0 && (j+((pos*2)>>hs))<(pcmlength>>hs)*2)
Chris@1:              fprintf(f,"%d %d\n",j,(int)bigassbuffer[j+((pos*2)>>hs)]);
Chris@1:         fclose(f);
Chris@1:       }
Chris@1: 
Chris@1:       exit(1);
Chris@1:     }
Chris@1:   }
Chris@1: }
Chris@1: 
Chris@1: int main(){
Chris@1:   OggVorbis_File ov;
Chris@1:   int i,ret;
Chris@1:   ogg_int64_t pcmlength;
Chris@1:   double timelength;
Chris@1:   char *bigassbuffer;
Chris@1:   int dummy;
Chris@1:   int hs=0;
Chris@1: 
Chris@1: #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
Chris@1:   _setmode( _fileno( stdin ), _O_BINARY );
Chris@1: #endif
Chris@1: 
Chris@1: 
Chris@1:   /* open the file/pipe on stdin */
Chris@1:   if(ov_open_callbacks(stdin,&ov,NULL,-1,OV_CALLBACKS_NOCLOSE)<0){
Chris@1:     fprintf(stderr,"Could not open input as an OggVorbis file.\n\n");
Chris@1:     exit(1);
Chris@1:   }
Chris@1: 
Chris@1: #if 0 /*enable this code to test seeking with halfrate decode */
Chris@1:   if(ov_halfrate(&ov,1)){
Chris@1:     fprintf(stderr,"Sorry; unable to set half-rate decode.\n\n");
Chris@1:     exit(1);
Chris@1:   }else
Chris@1:     hs=1;
Chris@1: #endif
Chris@1: 
Chris@1:   if(ov_seekable(&ov)){
Chris@1: 
Chris@1:     /* to simplify our own lives, we want to assume the whole file is
Chris@1:        stereo.  Verify this to avoid potentially mystifying users
Chris@1:        (pissing them off is OK, just don't confuse them) */
Chris@1:     for(i=0;i<ov.links;i++){
Chris@1:       vorbis_info *vi=ov_info(&ov,i);
Chris@1:       if(vi->channels!=2){
Chris@1:         fprintf(stderr,"Sorry; right now seeking_test can only use Vorbis files\n"
Chris@1:                "that are entirely stereo.\n\n");
Chris@1:         exit(1);
Chris@1:       }
Chris@1:     }
Chris@1:     
Chris@1:     /* because we want to do sample-level verification that the seek
Chris@1:        does what it claimed, decode the entire file into memory */
Chris@1:     pcmlength=ov_pcm_total(&ov,-1);
Chris@1:     timelength=ov_time_total(&ov,-1);
Chris@1:     bigassbuffer=malloc((pcmlength>>hs)*2); /* w00t */
Chris@1:     i=0;
Chris@1:     while(i<(pcmlength>>hs)*2){
Chris@1:       int ret=ov_read(&ov,bigassbuffer+i,((pcmlength>>hs)*2)-i,1,1,1,&dummy);
Chris@1:       if(ret<0){
Chris@1:         fprintf(stderr,"Error reading file.\n");
Chris@1:         exit(1);
Chris@1:       }
Chris@1:       if(ret){
Chris@1:         i+=ret;
Chris@1:       }else{
Chris@1:         pcmlength=(i/2)<<hs;
Chris@1:       }
Chris@1:       fprintf(stderr,"\rloading.... [%ld left]              ",
Chris@1:               (long)((pcmlength>>hs)*2-i));
Chris@1:     }
Chris@1:     
Chris@1:     {
Chris@1:       ogg_int64_t length=ov.end;
Chris@1:       fprintf(stderr,"\rtesting raw seeking to random places in %ld bytes....\n",
Chris@1:              (long)length);
Chris@1:     
Chris@1:       for(i=0;i<1000;i++){
Chris@1:         ogg_int64_t val=(double)rand()/RAND_MAX*length;
Chris@1:         fprintf(stderr,"\r\t%d [raw position %ld]...     ",i,(long)val);
Chris@1:         ret=ov_raw_seek(&ov,val);
Chris@1:         if(ret<0){
Chris@1:           fprintf(stderr,"seek failed: %d\n",ret);
Chris@1:           exit(1);
Chris@1:         }
Chris@1: 
Chris@1:         _verify(&ov,val,-1,-1.,pcmlength,bigassbuffer);
Chris@1: 
Chris@1:       }
Chris@1:     }
Chris@1: 
Chris@1:     fprintf(stderr,"\r");
Chris@1:     {
Chris@1:       fprintf(stderr,"testing pcm page seeking to random places in %ld samples....\n",
Chris@1:              (long)pcmlength);
Chris@1:     
Chris@1:       for(i=0;i<1000;i++){
Chris@1:         ogg_int64_t val=(double)rand()/RAND_MAX*pcmlength;
Chris@1:         fprintf(stderr,"\r\t%d [pcm position %ld]...     ",i,(long)val);
Chris@1:         ret=ov_pcm_seek_page(&ov,val);
Chris@1:         if(ret<0){
Chris@1:           fprintf(stderr,"seek failed: %d\n",ret);
Chris@1:           exit(1);
Chris@1:         }
Chris@1: 
Chris@1:         _verify(&ov,-1,val,-1.,pcmlength,bigassbuffer);
Chris@1: 
Chris@1:       }
Chris@1:     }
Chris@1: 
Chris@1:     fprintf(stderr,"\r");
Chris@1:     {
Chris@1:       fprintf(stderr,"testing pcm exact seeking to random places in %ld samples....\n",
Chris@1:              (long)pcmlength);
Chris@1:     
Chris@1:       for(i=0;i<1000;i++){
Chris@1:         ogg_int64_t val=(double)rand()/RAND_MAX*pcmlength;
Chris@1:         fprintf(stderr,"\r\t%d [pcm position %ld]...     ",i,(long)val);
Chris@1:         ret=ov_pcm_seek(&ov,val);
Chris@1:         if(ret<0){
Chris@1:           fprintf(stderr,"seek failed: %d\n",ret);
Chris@1:           exit(1);
Chris@1:         }
Chris@1:         if(ov_pcm_tell(&ov)!=((val>>hs)<<hs)){
Chris@1:           fprintf(stderr,"Declared position didn't perfectly match request: %ld != %ld\n",
Chris@1:                  (long)val,(long)ov_pcm_tell(&ov));
Chris@1:           exit(1);
Chris@1:         }
Chris@1: 
Chris@1:         _verify(&ov,-1,val,-1.,pcmlength,bigassbuffer);
Chris@1: 
Chris@1:       }
Chris@1:     }
Chris@1: 
Chris@1:     fprintf(stderr,"\r");
Chris@1:     {
Chris@1:       fprintf(stderr,"testing time page seeking to random places in %f seconds....\n",
Chris@1:              timelength);
Chris@1:     
Chris@1:       for(i=0;i<1000;i++){
Chris@1:         double val=(double)rand()/RAND_MAX*timelength;
Chris@1:         fprintf(stderr,"\r\t%d [time position %f]...     ",i,val);
Chris@1:         ret=ov_time_seek_page(&ov,val);
Chris@1:         if(ret<0){
Chris@1:           fprintf(stderr,"seek failed: %d\n",ret);
Chris@1:           exit(1);
Chris@1:         }
Chris@1: 
Chris@1:         _verify(&ov,-1,-1,val,pcmlength,bigassbuffer);
Chris@1: 
Chris@1:       }
Chris@1:     }
Chris@1: 
Chris@1:     fprintf(stderr,"\r");
Chris@1:     {
Chris@1:       fprintf(stderr,"testing time exact seeking to random places in %f seconds....\n",
Chris@1:              timelength);
Chris@1:     
Chris@1:       for(i=0;i<1000;i++){
Chris@1:         double val=(double)rand()/RAND_MAX*timelength;
Chris@1:         fprintf(stderr,"\r\t%d [time position %f]...     ",i,val);
Chris@1:         ret=ov_time_seek(&ov,val);
Chris@1:         if(ret<0){
Chris@1:           fprintf(stderr,"seek failed: %d\n",ret);
Chris@1:           exit(1);
Chris@1:         }
Chris@1:         if(ov_time_tell(&ov)<val-1 || ov_time_tell(&ov)>val+1){
Chris@1:           fprintf(stderr,"Declared position didn't perfectly match request: %f != %f\n",
Chris@1:                  val,ov_time_tell(&ov));
Chris@1:           exit(1);
Chris@1:         }
Chris@1: 
Chris@1:         _verify(&ov,-1,-1,val,pcmlength,bigassbuffer);
Chris@1: 
Chris@1:       }
Chris@1:     }
Chris@1:     
Chris@1:     fprintf(stderr,"\r                                           \nOK.\n\n");
Chris@1: 
Chris@1: 
Chris@1:   }else{
Chris@1:     fprintf(stderr,"Standard input was not seekable.\n");
Chris@1:   }
Chris@1: 
Chris@1:   ov_clear(&ov);
Chris@1:   return 0;
Chris@1: }
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