1 files changed, 66 insertions, 0 deletions
diff --git a/demo/freedv_700d_tx.c b/demo/freedv_700d_tx.c
new file mode 100644
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+++ b/demo/freedv_700d_tx.c
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+/*---------------------------------------------------------------------------*\
+
+  FILE........: freedv_700d_tx.c
+  AUTHOR......: David Rowe
+  DATE CREATED: April 2021
+
+  Demo transmit program using the FreeDV API (700D mode).
+ 
+  usage:
+  
+  cd ~/codec2/build_linux
+  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ./demo/freedv_700d_rx | aplay -f S16_LE
+
+  Listen to the modulated Tx signal:
+  
+  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | aplay -f S16_LE
+  
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2021 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  This program 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 Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "freedv_api.h"
+
+int main(int argc, char *argv[]) {
+    struct freedv            *freedv;
+
+    freedv = freedv_open(FREEDV_MODE_700D);
+    assert(freedv != NULL);
+
+    /* handy functions to set buffer sizes */
+    int n_speech_samples = freedv_get_n_speech_samples(freedv);
+    short speech_in[n_speech_samples];
+    int n_nom_modem_samples = freedv_get_n_nom_modem_samples(freedv);
+    short mod_out[n_nom_modem_samples];
+
+    /* OK main loop  --------------------------------------- */
+
+    while(fread(speech_in, sizeof(short), n_speech_samples, stdin) == n_speech_samples) {
+        freedv_tx(freedv, mod_out, speech_in);
+        fwrite(mod_out, sizeof(short), n_nom_modem_samples, stdout);
+    }
+
+    freedv_close(freedv);
+
+    return 0;
+}