diff options
Diffstat (limited to 'vorbis/examples/seeking_example.c')
| -rw-r--r-- | vorbis/examples/seeking_example.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/vorbis/examples/seeking_example.c b/vorbis/examples/seeking_example.c new file mode 100644 index 0000000..d039b0d --- /dev/null +++ b/vorbis/examples/seeking_example.c @@ -0,0 +1,277 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * + * by the Xiph.Org Foundation http://www.xiph.org/ * + * * + ******************************************************************** + + function: illustrate seeking, and test it too + + ********************************************************************/ + +#include <stdlib.h> +#include <stdio.h> +#include "vorbis/codec.h" +#include "vorbis/vorbisfile.h" + +#ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */ +# include <io.h> +# include <fcntl.h> +#endif + +void _verify(OggVorbis_File *ov, + ogg_int64_t val,ogg_int64_t pcmval,double timeval, + ogg_int64_t pcmlength, + char *bigassbuffer){ + off_t i; + int j; + long bread; + char buffer[4096]; + int dummy; + ogg_int64_t pos; + int hs = ov_halfrate_p(ov); + + /* verify the raw position, the pcm position and position decode */ + if(val!=-1 && ov_raw_tell(ov)<val){ + fprintf(stderr,"raw position out of tolerance: requested %ld, got %ld\n", + (long)val,(long)ov_raw_tell(ov)); + exit(1); + } + if(pcmval!=-1 && ov_pcm_tell(ov)>pcmval){ + fprintf(stderr,"pcm position out of tolerance: requested %ld, got %ld\n", + (long)pcmval,(long)ov_pcm_tell(ov)); + exit(1); + } + if(timeval!=-1 && ov_time_tell(ov)>timeval){ + fprintf(stderr,"time position out of tolerance: requested %f, got %f\n", + timeval,ov_time_tell(ov)); + exit(1); + } + pos=ov_pcm_tell(ov); + if(pos<0 || pos>pcmlength){ + fprintf(stderr,"pcm position out of bounds: got %ld\n",(long)pos); + exit(1); + } + bread=ov_read(ov,buffer,4096,1,1,1,&dummy); + for(j=0;j<bread;j++){ + if(buffer[j]!=bigassbuffer[j+((pos>>hs)*2)]){ + fprintf(stderr,"data after seek doesn't match declared pcm position %ld\n",(long)pos); + + for(i=0;i<(pcmlength>>hs)*2-bread;i++){ + for(j=0;j<bread;j++) + if(buffer[j] != bigassbuffer[i+j])break; + if(j==bread){ + fprintf(stderr,"data after seek appears to match position %ld\n",(long)((i/2)<<hs)); + } + } + { + FILE *f=fopen("a.m","w"); + for(j=0;j<bread;j++)fprintf(f,"%d %d\n",j,(int)buffer[j]); + fclose(f); + f=fopen("b.m","w"); + for(j=-4096;j<bread+4096;j++) + if(j+((pos*2)>>hs)>=0 && (j+((pos*2)>>hs))<(pcmlength>>hs)*2) + fprintf(f,"%d %d\n",j,(int)bigassbuffer[j+((pos*2)>>hs)]); + fclose(f); + } + + exit(1); + } + } +} + +int main(){ + OggVorbis_File ov; + int i,ret; + ogg_int64_t pcmlength; + double timelength; + char *bigassbuffer; + int dummy; + int hs=0; + +#ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */ + _setmode( _fileno( stdin ), _O_BINARY ); +#endif + + + /* open the file/pipe on stdin */ + if(ov_open_callbacks(stdin,&ov,NULL,-1,OV_CALLBACKS_NOCLOSE)<0){ + fprintf(stderr,"Could not open input as an OggVorbis file.\n\n"); + exit(1); + } + +#if 0 /*enable this code to test seeking with halfrate decode */ + if(ov_halfrate(&ov,1)){ + fprintf(stderr,"Sorry; unable to set half-rate decode.\n\n"); + exit(1); + }else + hs=1; +#endif + + if(ov_seekable(&ov)){ + + /* to simplify our own lives, we want to assume the whole file is + stereo. Verify this to avoid potentially mystifying users + (pissing them off is OK, just don't confuse them) */ + for(i=0;i<ov.links;i++){ + vorbis_info *vi=ov_info(&ov,i); + if(vi->channels!=2){ + fprintf(stderr,"Sorry; right now seeking_test can only use Vorbis files\n" + "that are entirely stereo.\n\n"); + exit(1); + } + } + + /* because we want to do sample-level verification that the seek + does what it claimed, decode the entire file into memory */ + pcmlength=ov_pcm_total(&ov,-1); + timelength=ov_time_total(&ov,-1); + bigassbuffer=malloc((pcmlength>>hs)*2); /* w00t */ + i=0; + while(i<(pcmlength>>hs)*2){ + int ret=ov_read(&ov,bigassbuffer+i,((pcmlength>>hs)*2)-i,1,1,1,&dummy); + if(ret<0){ + fprintf(stderr,"Error reading file.\n"); + exit(1); + } + if(ret){ + i+=ret; + }else{ + pcmlength=(i/2)<<hs; + } + fprintf(stderr,"\rloading.... [%ld left] ", + (long)((pcmlength>>hs)*2-i)); + } + + { + ogg_int64_t length=ov.end; + fprintf(stderr,"\rtesting raw seeking to random places in %ld bytes....\n", + (long)length); + + for(i=0;i<1000;i++){ + ogg_int64_t val=(double)rand()/RAND_MAX*length; + fprintf(stderr,"\r\t%d [raw position %ld]... ",i,(long)val); + ret=ov_raw_seek(&ov,val); + if(ret<0){ + fprintf(stderr,"seek failed: %d\n",ret); + exit(1); + } + + _verify(&ov,val,-1,-1.,pcmlength,bigassbuffer); + + } + } + + fprintf(stderr,"\r"); + { + fprintf(stderr,"testing pcm page seeking to random places in %ld samples....\n", + (long)pcmlength); + + for(i=0;i<1000;i++){ + ogg_int64_t val= i==0?(ogg_int64_t)0:(double)rand()/RAND_MAX*pcmlength; + fprintf(stderr,"\r\t%d [pcm position %ld]... ",i,(long)val); + ret=ov_pcm_seek_page(&ov,val); + if(ret<0){ + fprintf(stderr,"seek failed: %d\n",ret); + exit(1); + } + + _verify(&ov,-1,val,-1.,pcmlength,bigassbuffer); + + } + } + + fprintf(stderr,"\r"); + { + fprintf(stderr,"testing pcm exact seeking to random places in %f seconds....\n", + timelength); + for(i=0;i<1000;i++){ + ogg_int64_t val= i==0?(ogg_int64_t)0:(double)rand()/RAND_MAX*pcmlength; + fprintf(stderr,"\r\t%d [pcm position %ld]... ",i,(long)val); + ret=ov_pcm_seek(&ov,val); + if(ret<0){ + fprintf(stderr,"seek failed: %d\n",ret); + exit(1); + } + if(ov_pcm_tell(&ov)!=((val>>hs)<<hs)){ + fprintf(stderr,"Declared position didn't perfectly match request: %ld != %ld\n", + (long)val,(long)ov_pcm_tell(&ov)); + exit(1); + } + + _verify(&ov,-1,val,-1.,pcmlength,bigassbuffer); + + } + } + + fprintf(stderr,"\r"); + { + fprintf(stderr,"testing time page seeking to random places in %f seconds....\n", + timelength); + + for(i=0;i<1000;i++){ + double val=(double)rand()/RAND_MAX*timelength; + fprintf(stderr,"\r\t%d [time position %f]... ",i,val); + ret=ov_time_seek_page(&ov,val); + if(ret<0){ + fprintf(stderr,"seek failed: %d\n",ret); + exit(1); + } + + _verify(&ov,-1,-1,val,pcmlength,bigassbuffer); + + } + } + + fprintf(stderr,"\r"); + { + fprintf(stderr,"testing time exact seeking to random places in %f seconds....\n", + timelength); + + for(i=0;i<1000;i++){ + double val=(double)rand()/RAND_MAX*timelength; + fprintf(stderr,"\r\t%d [time position %f]... ",i,val); + ret=ov_time_seek(&ov,val); + if(ret<0){ + fprintf(stderr,"seek failed: %d\n",ret); + exit(1); + } + if(ov_time_tell(&ov)<val-1 || ov_time_tell(&ov)>val+1){ + fprintf(stderr,"Declared position didn't perfectly match request: %f != %f\n", + val,ov_time_tell(&ov)); + exit(1); + } + + _verify(&ov,-1,-1,val,pcmlength,bigassbuffer); + + } + } + + fprintf(stderr,"\r \nOK.\n\n"); + + + }else{ + fprintf(stderr,"Standard input was not seekable.\n"); + } + + ov_clear(&ov); + return 0; +} + + + + + + + + + + + + + |