looper/subprojects/mpg123/doc/examples/scan.c
2024-09-28 10:31:18 -07:00

48 lines
1.2 KiB
C

/*
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>
/** The whole operation. */
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;
}