source: tests/src/io/test-source_seek.c @ f7e30e8

#include <aubio.h>
#include "utils_tests.h"

int main (int argc, char **argv)
{
  uint_t err = 0;
  if (argc < 2) {
    err = 2;
    PRINT_ERR("not enough arguments\n");
    PRINT_MSG("read a wave file as a mono vector\n");
    PRINT_MSG("usage: %s <source_path> [samplerate] [hop_size]\n", argv[0]);
    PRINT_MSG("examples:\n");
    PRINT_MSG(" - read file.wav at original samplerate\n");
    PRINT_MSG("       %s file.wav\n", argv[0]);
    PRINT_MSG(" - read file.wav at 32000Hz\n");
    PRINT_MSG("       %s file.aif 32000\n", argv[0]);
    PRINT_MSG(" - read file.wav at original samplerate with 4096 blocks\n");
    PRINT_MSG("       %s file.wav 0 4096 \n", argv[0]);
    return err;
  }

  uint_t samplerate = 0;
  uint_t hop_size = 256;
  uint_t n_frames = 0, read = 0;
  uint_t old_n_frames_1 = 0, old_n_frames_2 = 0, old_n_frames_3 = 0;
  if ( argc == 3 ) samplerate = atoi(argv[2]);
  if ( argc == 4 ) hop_size = atoi(argv[3]);

  char_t *source_path = argv[1];

  fvec_t *vec = new_fvec(hop_size);

  aubio_source_t* s = new_aubio_source(source_path, samplerate, hop_size);
  if (!s) { err = 1; goto beach; }

  if (samplerate == 0 ) samplerate = aubio_source_get_samplerate(s);

  do {
    aubio_source_do(s, vec, &read);
    //fvec_print (vec);
    n_frames += read;
  } while ( read == hop_size );

  PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
      n_frames * 1. / samplerate,
      n_frames, samplerate,
      n_frames / hop_size, source_path);

  old_n_frames_1 = n_frames;

  aubio_source_seek (s, 0);

  n_frames = 0;
  do {
    aubio_source_do(s, vec, &read);
    //fvec_print (vec);
    n_frames += read;
  } while ( read == hop_size );

  PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
      n_frames * 1. / samplerate,
      n_frames, samplerate,
      n_frames / hop_size, source_path);

  old_n_frames_2 = n_frames;

  aubio_source_seek (s, old_n_frames_1 / 2);

  n_frames = 0;
  do {
    aubio_source_do(s, vec, &read);
    //fvec_print (vec);
    n_frames += read;
  } while ( read == hop_size );

  PRINT_MSG("read %.2fs, %d frames at %dHz (%d blocks) from %s\n",
      n_frames * 1. / samplerate,
      n_frames, samplerate,
      n_frames / hop_size, source_path);

  old_n_frames_3 = n_frames;

  del_aubio_source (s);
beach:
  del_fvec (vec);

  // check that we got exactly the same number of frames
  assert ( old_n_frames_2 == old_n_frames_1 );
  // check that we got about half the frames, with 3 decimals
  assert ( roundf(1.e3 * old_n_frames_1 / old_n_frames_3) / 1.e3 == 2.);
  return err;
}