src/synth/sampler.c: add a simple sampler

diff --git a/src/synth/sampler.c b/src/synth/sampler.c
new file mode 100644 (file)
index 0000000..bbacf46
--- /dev/null
+++ b/src/synth/sampler.c
@@ -0,0 +1,129 @@
+/*
+  Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org>
+
+  This file is part of aubio.
+
+  aubio is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  aubio is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "config.h"
+#include "aubio_priv.h"
+#include "fvec.h"
+#include "fmat.h"
+#include "io/source.h"
+#include "synth/sampler.h"
+
+struct _aubio_sampler_t {
+  uint_t samplerate;
+  uint_t blocksize;
+  aubio_source_t *source;
+  fvec_t *source_output;
+  fmat_t *source_output_multi;
+  char_t *uri;
+  uint_t playing;
+};
+
+aubio_sampler_t *new_aubio_sampler(uint_t samplerate, uint_t blocksize)
+{
+  aubio_sampler_t *s = AUBIO_NEW(aubio_sampler_t);
+  s->samplerate = samplerate;
+  s->blocksize = blocksize;
+  s->source_output = new_fvec(blocksize);
+  s->source_output_multi = new_fmat(blocksize, 4);
+  s->source = NULL;
+  s->playing = 0;
+  return s;
+}
+
+uint_t aubio_sampler_load( aubio_sampler_t * o, char_t * uri )
+{
+  if (o->source) del_aubio_source(o->source);
+  o->uri = uri;
+  o->source = new_aubio_source(uri, o->samplerate, o->blocksize);
+  if (o->source) return 0;
+  AUBIO_ERR("sampler: failed loading %s", uri);
+  return 1;
+}
+
+void aubio_sampler_do ( aubio_sampler_t * o, fvec_t * input, fvec_t * output)
+{
+  uint_t read = 0, i;
+  if (o->playing) {
+    aubio_source_do (o->source, o->source_output, &read);
+    for (i = 0; i < output->length; i++) {
+      output->data[i] += o->source_output->data[i];
+    }
+    if (read < o->blocksize) o->playing = 0;
+  }
+  if (input && input != output) {
+    for (i = 0; i < output->length; i++) {
+      output->data[i] += input->data[i];
+    }
+  }
+}
+
+void aubio_sampler_do_multi ( aubio_sampler_t * o, fmat_t * input, fmat_t * output)
+{
+  uint_t read = 0, i, j;
+  if (o->playing) {
+    aubio_source_do_multi (o->source, o->source_output_multi, &read);
+    for (i = 0; i < output->height; i++) {
+      for (j = 0; j < output->length; j++) {
+        output->data[i][j] = o->source_output_multi->data[i][j];
+      }
+    }
+    if (read == 0) o->playing = 0;
+  }
+  if (input && input != output) {
+    for (i = 0; i < output->height; i++) {
+      for (j = 0; j < output->length; j++) {
+        output->data[i][j] += input->data[i][j];
+      }
+    }
+  }
+}
+
+uint_t aubio_sampler_get_playing ( aubio_sampler_t * o )
+{
+  return o->playing;
+}
+
+uint_t aubio_sampler_set_playing ( aubio_sampler_t * o, uint_t playing )
+{
+  o->playing = (playing == 1) ? 1 : 0;
+  return 0;
+}
+
+uint_t aubio_sampler_play ( aubio_sampler_t * o )
+{
+  aubio_source_seek (o->source, 0);
+  return aubio_sampler_set_playing (o, 1);
+}
+
+uint_t aubio_sampler_stop ( aubio_sampler_t * o )
+{
+  return aubio_sampler_set_playing (o, 0);
+}
+
+void del_aubio_sampler( aubio_sampler_t * o )
+{
+  if (o->source) {
+    del_aubio_source(o->source);
+  }
+  del_fvec(o->source_output);
+  del_fmat(o->source_output_multi);
+  AUBIO_FREE(o);
+}