1 files changed, 75 insertions, 0 deletions
diff --git a/src/rtfwk/common.c b/src/rtfwk/common.c
new file mode 100644
index 0000000..cf37a9d
--- /dev/null
+++ b/src/rtfwk/common.c
@@ -0,0 +1,75 @@
+/* GMR-1 RT framework common functions */
+
+/* (C) 2011-2016 by Sylvain Munaut <tnt@246tNt.com>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <complex.h>
+#include <errno.h>
+
+#include <osmocom/dsp/cxvec.h>
+#include <osmocom/dsp/cxvec_math.h>
+
+#include <osmocom/gmr1/sdr/defs.h>
+#include <osmocom/gmr1/sdr/pi4cxpsk.h>
+
+#include "common.h"
+
+
+int
+win_map(struct osmo_cxvec *win,
+        float complex *data, int data_len,
+        int begin, int win_len)
+{
+	if ((begin + win_len) > data_len)
+		return -1;
+
+	osmo_cxvec_init_from_data(win, &data[begin], win_len);
+
+	return 0;
+}
+
+int
+burst_map(struct osmo_cxvec *burst,
+          float complex *data, int data_len, int base_align, int sps,
+          struct gmr1_pi4cxpsk_burst *burst_type, int tn, int win)
+{
+	int begin, len;
+	int etoa;
+
+	etoa  = win >> 1;
+	begin = base_align + (sps * tn * 39) - etoa;
+	len   = (burst_type->len * sps) + win;
+
+	if ((begin < 0) || ((begin + len) > data_len))
+		return -EIO;
+
+	osmo_cxvec_init_from_data(burst, &data[begin], len);
+
+	return etoa;
+}
+
+float
+burst_energy(struct osmo_cxvec *burst)
+{
+	int i;
+	int b = (burst->len >> 5); /* exclude the borders */
+	float e = 0.0f;
+	for (i=b; i<burst->len-b; i++)
+		e += osmo_normsqf(burst->data[i]);
+	e /= burst->len;
+	return e;
+}