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tests/src/io/test-source_seek.c: improve test

--- a/tests/src/io/test-source_seek.c

+++ b/tests/src/io/test-source_seek.c

@@ -22,7 +22,7 @@

   uint_t samplerate = 0;

   uint_t hop_size = 256;

   uint_t n_frames = 0, read = 0;

-  uint_t old_n_frames;

+  uint_t old_n_frames_1, old_n_frames_2, old_n_frames_3;

   if ( argc == 3 ) samplerate = atoi(argv[2]);

   if ( argc == 4 ) hop_size = atoi(argv[3]);

@@ -41,13 +41,31 @@

     n_frames += read;

   } while ( read == hop_size );

-  PRINT_MSG("read %d frames at %dHz (%d blocks) from %s\n", n_frames, samplerate,

-    n_frames / hop_size, source_path);

+  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);

-  old_n_frames = n_frames;

+  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, n_frames / 2);

+

   n_frames = 0;

   do {

     aubio_source_do(s, vec, &read);

@@ -55,13 +73,18 @@

     n_frames += read;

   } while ( read == hop_size );

-  PRINT_MSG("read %d frames at %dHz (%d blocks) from %s\n", n_frames, samplerate,

-    n_frames / hop_size, source_path);

+  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);

-  assert ( n_frames == old_n_frames );

+  assert ( old_n_frames_2 == old_n_frames_1 );

+  assert ( old_n_frames_3 == (uint_t)floor(old_n_frames_1 / 2. + .5) );

   return err;

 }