From 90e25cc760d412b373a8830e3df8ce4ce6e59a2b Mon Sep 17 00:00:00 2001
From: Paul Brossier <piem@piem.org>
Date: Sat, 11 Mar 2017 00:22:38 +0100
Subject: [PATCH] tests/src/spectral/tests-awhitening.c: add whitening example

---
 tests/src/spectral/test-awhitening.c | 84 ++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 tests/src/spectral/test-awhitening.c

diff --git a/tests/src/spectral/test-awhitening.c b/tests/src/spectral/test-awhitening.c
new file mode 100644
index 00000000..e483141f
--- /dev/null
+++ b/tests/src/spectral/test-awhitening.c
@@ -0,0 +1,84 @@
+#include <aubio.h>
+#include "utils_tests.h"
+
+int main (int argc, char **argv)
+{
+  sint_t err = 0;
+
+  if (argc < 3) {
+    err = 2;
+    PRINT_ERR("not enough arguments\n");
+    PRINT_MSG("usage: %s <input_path> <output_path> [samplerate] [hop_size]\n", argv[0]);
+    return err;
+  }
+
+  uint_t samplerate = 0;
+  uint_t win_size = 1024;
+  uint_t hop_size = 512;
+  uint_t n_frames = 0, read = 0;
+
+  char_t *source_path = argv[1];
+  char_t *sink_path = argv[2];
+
+  if ( argc >= 4 ) samplerate = atoi(argv[3]);
+  if ( argc >= 5 ) hop_size = atoi(argv[4]);
+  if ( argc >= 6 ) {
+    err = 2;
+    PRINT_ERR("too many arguments\n");
+    return err;
+  }
+
+  fvec_t *vec = new_fvec(hop_size);
+  fvec_t *out = new_fvec(hop_size); // output buffer
+  fvec_t *scale = new_fvec(hop_size);
+  cvec_t *fftgrain = new_cvec(win_size); // fft norm and phase
+  if (!vec) { err = 1; goto beach_fvec; }
+
+  aubio_source_t *i = new_aubio_source(source_path, samplerate, hop_size);
+  if (!i) { err = 1; goto beach_source; }
+
+  if (samplerate == 0 ) samplerate = aubio_source_get_samplerate(i);
+
+  aubio_sink_t *o = new_aubio_sink(sink_path, samplerate);
+  if (!o) { err = 1; goto beach_sink; }
+
+  aubio_pvoc_t *pv = new_aubio_pvoc(win_size, hop_size);
+
+  aubio_spectral_whitening_t *awhitening =
+    new_aubio_spectral_whitening (win_size, hop_size, samplerate);
+
+  aubio_spectral_whitening_set_relax_time(awhitening, 20.);
+  fvec_set_all(scale, 3.);
+
+  PRINT_MSG("spectral whitening relaxation time is %f\n",
+      aubio_spectral_whitening_get_relax_time(awhitening));
+
+  do {
+    aubio_source_do(i, vec, &read);
+    aubio_pvoc_do(pv, vec, fftgrain);
+    // apply spectral whitening
+    aubio_spectral_whitening_do(awhitening, fftgrain);
+    // rebuild the signal
+    aubio_pvoc_rdo(pv, fftgrain, out);
+    // make louder
+    fvec_weight(out, scale);
+    // make sure we dont saturate
+    fvec_clamp(out, 1.);
+    // write output
+    aubio_sink_do(o, out, read);
+    n_frames += read;
+  } while ( read == hop_size );
+
+  PRINT_MSG("read %d frames at %dHz (%d blocks) from %s written to %s\n",
+      n_frames, samplerate, n_frames / hop_size,
+      source_path, sink_path);
+
+  del_aubio_sink(o);
+beach_sink:
+  del_aubio_source(i);
+beach_source:
+  del_fvec(vec);
+beach_fvec:
+  return err;
+}
+
-- 
2.11.0