comparison src/libvorbis-1.3.3/examples/seeking_example.c @ 86:98c1576536ae

Bring in flac, ogg, vorbis

+/********************************************************************
+ *                                                                  *
+ * 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
+ last mod: $Id: seeking_example.c 17561 2010-10-23 10:34:24Z xiphmont $
+
+ ********************************************************************/
+
+#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=(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 %ld samples....\n",
+             (long)pcmlength);
+    
+      for(i=0;i<1000;i++){
+        ogg_int64_t val=(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;
+}
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