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- /********************************************************************
- * *
- * 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 1994-2002 *
- * by the XIPHOPHORUS Company http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: illustrate seeking, and test it too
- last mod: $Id: seeking_example.c,v 1.15 2002/07/11 06:40:47 xiphmont Exp $
-
- ********************************************************************/
-
- #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 pos,
- ogg_int64_t val,ogg_int64_t pcmval,
- ogg_int64_t pcmlength,
- char *bigassbuffer){
- int j;
- long bread;
- char buffer[4096];
- int dummy;
-
- /* verify the raw position, the pcm position and position decode */
- if(val!=-1 && ov_raw_tell(ov)<val){
- printf("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){
- printf("pcm position out of tolerance: requested %ld, got %ld\n",
- (long)pcmval,(long)ov_pcm_tell(ov));
- exit(1);
- }
- pos=ov_pcm_tell(ov);
- if(pos<0 || pos>pcmlength){
- printf("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*2]){
- printf("data position after seek doesn't match pcm position\n");
-
- {
- FILE *f=fopen("a.m","w");
- for(j=0;j<bread;j++)fprintf(f,"%d\n",(int)buffer[j]);
- fclose(f);
- f=fopen("b.m","w");
- for(j=0;j<bread;j++)fprintf(f,"%d\n",(int)bigassbuffer[j+pos*2]);
- fclose(f);
- }
-
- exit(1);
- }
- }
- }
-
- int main(){
- OggVorbis_File ov;
- int i,ret;
- ogg_int64_t pcmlength;
- char *bigassbuffer;
- int dummy;
-
- #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
- _setmode( _fileno( stdin ), _O_BINARY );
- _setmode( _fileno( stdout ), _O_BINARY );
- #endif
-
-
- /* open the file/pipe on stdin */
- if(ov_open(stdin,&ov,NULL,-1)<0){
- printf("Could not open input as an OggVorbis file.\n\n");
- exit(1);
- }
-
- 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){
- printf("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 */
- fflush(stdout);
- pcmlength=ov_pcm_total(&ov,-1);
- bigassbuffer=malloc(pcmlength*2); /* w00t */
- i=0;
- while(i<pcmlength*2){
- int ret=ov_read(&ov,bigassbuffer+i,pcmlength*2-i,1,1,1,&dummy);
- if(ret<0)continue;
- if(ret){
- i+=ret;
- }else{
- pcmlength=i/2;
- }
- fprintf(stderr,"\rloading.... [%ld left] ",
- (long)(pcmlength*2-i));
- }
-
- /* Exercise all the real seeking cases; ov_raw_seek,
- ov_pcm_seek_page and ov_pcm_seek. time seek is just a wrapper
- on pcm_seek */
- {
- ogg_int64_t length=ov.end;
- printf("\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;
- ogg_int64_t pos;
- printf("\r\t%d [raw position %ld]... ",i,(long)val);
- fflush(stdout);
- ret=ov_raw_seek(&ov,val);
- if(ret<0){
- printf("seek failed: %d\n",ret);
- exit(1);
- }
-
- _verify(&ov,pos,val,-1,pcmlength,bigassbuffer);
-
- }
- }
-
- printf("\r");
- {
- printf("testing pcm page seeking to random places in %ld samples....\n",
- (long)pcmlength);
-
- for(i=0;i<1000;i++){
- ogg_int64_t val=(double)rand()/RAND_MAX*pcmlength;
- ogg_int64_t pos;
- printf("\r\t%d [pcm position %ld]... ",i,(long)val);
- fflush(stdout);
- ret=ov_pcm_seek_page(&ov,val);
- if(ret<0){
- printf("seek failed: %d\n",ret);
- exit(1);
- }
-
- _verify(&ov,pos,-1,val,pcmlength,bigassbuffer);
-
- }
- }
-
- printf("\r");
- {
- ogg_int64_t length=ov.end;
- printf("testing pcm exact seeking to random places in %ld samples....\n",
- (long)pcmlength);
-
- for(i=0;i<1000;i++){
- ogg_int64_t val=(double)rand()/RAND_MAX*pcmlength;
- ogg_int64_t pos;
- printf("\r\t%d [pcm position %ld]... ",i,(long)val);
- fflush(stdout);
- ret=ov_pcm_seek(&ov,val);
- if(ret<0){
- printf("seek failed: %d\n",ret);
- exit(1);
- }
- if(ov_pcm_tell(&ov)!=val){
- printf("Declared position didn't perfectly match request: %ld != %ld\n",
- (long)val,(long)ov_pcm_tell(&ov));
- exit(1);
- }
-
- _verify(&ov,pos,-1,val,pcmlength,bigassbuffer);
-
- }
- }
-
- printf("\r \nOK.\n\n");
-
-
- }else{
- printf("Standard input was not seekable.\n");
- }
-
- ov_clear(&ov);
- return 0;
- }
-
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