gr-vocoder: adds alaw encoder, decoder, and audio loopback example

3 files changed, 130 insertions, 0 deletions

diff --git a/gr-vocoder/lib/Makefile.am b/gr-vocoder/lib/Makefile.am
index f5e3e2240..e05d61f3c 100644
--- a/gr-vocoder/lib/Makefile.am
+++ b/gr-vocoder/lib/Makefile.am
@@ -29,6 +29,8 @@ AM_CPPFLAGS = $(STD_DEFINES_AND_INCLUDES) $(PYTHON_CPPFLAGS) $(WITH_INCLUDES) \
 lib_LTLIBRARIES = libgnuradio-vocoder.la
 
 libgnuradio_vocoder_la_SOURCES = \
+	vocoder_alaw_decode_bs.cc \
+	vocoder_alaw_encode_sb.cc \
 	vocoder_codec2_decode_ps.cc \
 	vocoder_codec2_encode_sp.cc \
 	vocoder_cvsd_encode_sb.cc \
diff --git a/gr-vocoder/lib/vocoder_alaw_decode_bs.cc b/gr-vocoder/lib/vocoder_alaw_decode_bs.cc
new file mode 100644
index 000000000..7ffdddd81
--- /dev/null
+++ b/gr-vocoder/lib/vocoder_alaw_decode_bs.cc
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2011 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_alaw_decode_bs.h>
+#include <gr_io_signature.h>
+#include <limits.h>
+
+extern "C" {
+#include "g7xx/g72x.h"
+}
+
+vocoder_alaw_decode_bs_sptr vocoder_make_alaw_decode_bs()
+{
+  return gnuradio::get_initial_sptr(new vocoder_alaw_decode_bs());
+}
+
+vocoder_alaw_decode_bs::vocoder_alaw_decode_bs()
+  : gr_sync_block("vocoder_alaw_decode_bs",
+		  gr_make_io_signature (1, 1, sizeof (unsigned char)),
+		  gr_make_io_signature (1, 1, sizeof (short)))
+{
+}
+
+vocoder_alaw_decode_bs::~vocoder_alaw_decode_bs()
+{
+}
+
+
+
+int 
+vocoder_alaw_decode_bs::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];
+
+  for(int i = 0; i < noutput_items; i++)
+    out[i] = alaw2linear(in[i]);
+  
+  return noutput_items;
+}
diff --git a/gr-vocoder/lib/vocoder_alaw_encode_sb.cc b/gr-vocoder/lib/vocoder_alaw_encode_sb.cc
new file mode 100644
index 000000000..e4d975271
--- /dev/null
+++ b/gr-vocoder/lib/vocoder_alaw_encode_sb.cc
@@ -0,0 +1,63 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2011 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_alaw_encode_sb.h>
+#include <gr_io_signature.h>
+#include <limits.h>
+
+extern "C" {
+#include "g7xx/g72x.h"
+}
+
+vocoder_alaw_encode_sb_sptr vocoder_make_alaw_encode_sb()
+{
+  return gnuradio::get_initial_sptr(new vocoder_alaw_encode_sb());
+}
+
+vocoder_alaw_encode_sb::vocoder_alaw_encode_sb()
+  : gr_sync_block("vocoder_alaw_encode_sb",
+		  gr_make_io_signature (1, 1, sizeof(short)),
+		  gr_make_io_signature (1, 1, sizeof(unsigned char)))
+{
+}
+
+vocoder_alaw_encode_sb::~vocoder_alaw_encode_sb()
+{
+}
+
+int 
+vocoder_alaw_encode_sb::work(int noutput_items,
+			     gr_vector_const_void_star &input_items,
+			     gr_vector_void_star &output_items)
+{
+  const short *in = (const short *)input_items[0];
+  unsigned char *out = (unsigned char *)output_items[0];
+  
+  for(int i = 0; i < noutput_items; i++)
+    out[i] = linear2alaw(in[i]);
+
+  return noutput_items;
+}