sysmobts: add a skeleton for codec frame processing

1 files changed, 95 insertions, 0 deletions

diff --git a/src/osmo-bts-sysmo/tch.c b/src/osmo-bts-sysmo/tch.c
new file mode 100644
index 00000000..87de8437
--- /dev/null
+++ b/src/osmo-bts-sysmo/tch.c
@@ -0,0 +1,95 @@
+/* Traffic channel support for Sysmocom BTS L1 */
+
+/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
+ *
+ * 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 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 <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/gsm/gsm_utils.h>
+
+#include <osmo-bts/logging.h>
+#include <osmo-bts/bts.h>
+#include <osmo-bts/gsm_data.h>
+#include <osmo-bts/measurement.h>
+
+#include <sysmocom/femtobts/femtobts.h>
+#include <sysmocom/femtobts/gsml1prim.h>
+#include <sysmocom/femtobts/gsml1const.h>
+#include <sysmocom/femtobts/gsml1types.h>
+
+#include "femtobts.h"
+#include "l1_if.h"
+
+int l1if_tch_rx(struct gsm_lchan *lchan, 
+		struct msgb *l1p_msg)
+{
+	GsmL1_Prim_t *l1p = msgb_l1prim(l1p_msg);
+	GsmL1_PhDataInd_t *data_ind = &l1p->u.phDataInd;
+	uint8_t payload_type = data_ind->msgUnitParam.u8Buffer[0];
+	uint8_t *payload = data_ind->msgUnitParam.u8Buffer + 1;
+	uint8_t payload_len;
+
+	if (data_ind->msgUnitParam.u8Size < 1) {
+		LOGP(DL1C, LOGL_ERROR, "%s Rx Payload size 0\n",
+			gsm_lchan_name(lchan));
+		return -EINVAL;
+	}
+	payload_len = data_ind->msgUnitParam.u8Size - 1;
+
+	switch (payload_type) {
+	case GsmL1_TchPlType_Fr:
+		if (lchan->type != GSM_LCHAN_TCH_F)
+			goto err_payload_match;
+		break;
+	case GsmL1_TchPlType_Hr:
+		if (lchan->type != GSM_LCHAN_TCH_H)
+			goto err_payload_match;
+		break;
+	case GsmL1_TchPlType_Amr:
+		if (lchan->type != GSM_LCHAN_TCH_H &&
+		    lchan->type != GSM_LCHAN_TCH_F)
+			goto err_payload_match;
+	default:
+		LOGP(DL1C, LOGL_NOTICE, "%s Rx Payload Type %s is unsupported\n",
+			gsm_lchan_name(lchan),
+			get_value_string(femtobts_tch_pl_names, payload_type));
+		break;
+	}
+
+	LOGP(DL1C, LOGL_DEBUG, "%s Rx codec frame (%u): %s\n", gsm_lchan_name(lchan),
+		payload_len, osmo_hexdump(payload, payload_len));
+
+	return 0;
+
+err_payload_match:
+	LOGP(DL1C, LOGL_ERROR, "%s Rx Payload Type %s incompatible with lchan\n",
+		gsm_lchan_name(lchan),
+		get_value_string(femtobts_tch_pl_names, payload_type));
+	return -EINVAL;
+}