1 files changed, 98 insertions, 0 deletions
diff --git a/gr-vocoder/lib/freedv_tx_ss_impl.cc b/gr-vocoder/lib/freedv_tx_ss_impl.cc
new file mode 100644
index 0000000000..a375510050
--- /dev/null
+++ b/gr-vocoder/lib/freedv_tx_ss_impl.cc
@@ -0,0 +1,98 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2016 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 "freedv_tx_ss_impl.h"
+
+#include <gnuradio/io_signature.h>
+#include <stdexcept>
+#include <iostream>
+#include <iomanip>
+
+extern "C" {
+  char
+  get_next_tx_char(void *callback_state)
+  {
+    char c;
+    struct freedv_tx_callback_state* pstate;
+
+    pstate = (struct freedv_tx_callback_state*)callback_state;
+    c = *pstate->ptx_str++;
+
+    if (*pstate->ptx_str == 0) {
+      pstate->ptx_str = pstate->tx_str;
+      c = 0x0d; // FreeDV uses Carriage Return termination
+    }
+
+    return c;
+  }
+}
+
+namespace gr {
+  namespace vocoder {
+
+    freedv_tx_ss::sptr
+    freedv_tx_ss::make(int mode, const std::string msg_txt)
+    {
+      return gnuradio::get_initial_sptr
+        (new freedv_tx_ss_impl(mode, msg_txt));
+    }
+
+    freedv_tx_ss_impl::freedv_tx_ss_impl(int mode, const std::string msg_txt)
+      : sync_block("vocoder_freedv_tx_ss",
+                   io_signature::make(1, 1, sizeof(short)),
+                   io_signature::make(1, 1, sizeof(short))),
+        d_mode(mode), d_msg_text(msg_txt)
+    {
+      if((d_freedv = freedv_open(mode)) == NULL)
+        throw std::runtime_error("freedv_tx_ss_impl: freedv_open failed");
+      snprintf(d_cb_state.tx_str,79,"%s",d_msg_text.c_str());
+      d_cb_state.ptx_str = d_cb_state.tx_str;
+      freedv_set_callback_txt(d_freedv, NULL, get_next_tx_char, (void *) &d_cb_state);
+      d_nom_modem_samples = freedv_get_n_nom_modem_samples(d_freedv);
+      set_output_multiple(d_nom_modem_samples);
+    }
+
+    freedv_tx_ss_impl::~freedv_tx_ss_impl()
+    {
+      freedv_close(d_freedv);
+    }
+
+    int
+    freedv_tx_ss_impl::work(int noutput_items,
+                            gr_vector_const_void_star &input_items,
+                            gr_vector_void_star &output_items)
+    {
+      short *in = (short*)input_items[0];
+      short *out = (short*)output_items[0];
+      int i;
+
+      for(i=0;i<(noutput_items/d_nom_modem_samples);i++)
+        freedv_tx(d_freedv, &(out[i*d_nom_modem_samples]), &(in[i*d_nom_modem_samples]));
+      return noutput_items;
+    }
+
+  } /* namespace vocoder */
+} /* namespace gr */