scan.c

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/*
    scan: Estimate length (sample count) of a mpeg file and compare to length from exact scan.
 
    This is example code only sensible to be considered in the public domain.
    Initially written by Thomas Orgis
*/
 
/* Note the lack of error checking here.
   While it would be nicer to inform the user about troubles, libmpg123 is designed _not_ to bite you on operations with invalid handles , etc.
  You just jet invalid results on invalid operations... */
 
#include <mpg123.h>
#include <stdio.h>
 
int main(int argc, char **argv)
{
    mpg123_handle *m;
    int i;
    if(argc < 2)
    {
        fprintf(stderr, "\nI will give you the estimated and exact sample lengths of MPEG audio files.\n");
        fprintf(stderr, "\nUsage: %s <mpeg audio file list>\n\n", argv[0]);
        return -1;
    }
#if MPG123_API_VERSION < 46
    mpg123_init();
#endif
    m = mpg123_new(NULL, NULL);
    mpg123_param(m, MPG123_RESYNC_LIMIT, -1, 0); /* New in library version 0.0.1 . */
    for(i = 1; i < argc; ++i)
    {
        off_t a, b;
        
        mpg123_open(m, argv[i]);
 
        a = mpg123_length(m);       
        mpg123_scan(m);
        b = mpg123_length(m);
 
        mpg123_close(m);
 
        printf("File %i: estimated %li vs. scanned %li\n", i, (long)a, (long)b);
    }
 
    mpg123_delete(m);
    return 0;
}