gr-vocoder: reimplemented gr-gsm-fr-vocoder in gr-vocoder

1 files changed, 72 insertions, 0 deletions

diff --git a/gr-vocoder/lib/vocoder_gsm_fr_decode_ps.cc b/gr-vocoder/lib/vocoder_gsm_fr_decode_ps.cc
new file mode 100644
index 000000000..986e0814e
--- /dev/null
+++ b/gr-vocoder/lib/vocoder_gsm_fr_decode_ps.cc
@@ -0,0 +1,72 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2010 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "vocoder_gsm_fr_decode_ps.h"
+extern "C"{
+#include "gsm/gsm.h"
+}
+#include <gr_io_signature.h>
+#include <stdexcept>
+#include <assert.h>
+
+vocoder_gsm_fr_decode_ps_sptr
+vocoder_make_gsm_fr_decode_ps ()
+{
+  return gnuradio::get_initial_sptr(new vocoder_gsm_fr_decode_ps ());
+}
+
+vocoder_gsm_fr_decode_ps::vocoder_gsm_fr_decode_ps ()
+  : gr_sync_interpolator ("vocoder_gsm_fr_decode_ps",
+			  gr_make_io_signature (1, 1, sizeof (gsm_frame)),
+			  gr_make_io_signature (1, 1, sizeof (short)),
+			  GSM_SAMPLES_PER_FRAME)
+{
+  if ((d_gsm = gsm_create ()) == 0)
+    throw std::runtime_error ("vocoder_gsm_fr_decode_ps: gsm_create failed");
+}
+
+vocoder_gsm_fr_decode_ps::~vocoder_gsm_fr_decode_ps ()
+{
+  gsm_destroy (d_gsm);
+}
+
+int
+vocoder_gsm_fr_decode_ps::work (int noutput_items,
+			gr_vector_const_void_star &input_items,
+			gr_vector_void_star &output_items)
+{
+  const unsigned char *in = (const unsigned char *) input_items[0];
+  short *out = (short *) output_items[0];
+
+  assert ((noutput_items % GSM_SAMPLES_PER_FRAME) == 0);
+
+  for (int i = 0; i < noutput_items; i += GSM_SAMPLES_PER_FRAME){
+    gsm_decode (d_gsm, const_cast<unsigned char*>(in), out);
+    in += sizeof (gsm_frame);
+    out += GSM_SAMPLES_PER_FRAME;
+  }
+
+  return noutput_items;
+}