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