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-rw-r--r--include/openbsc/trau_frame.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/include/openbsc/trau_frame.h b/include/openbsc/trau_frame.h
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+++ b/include/openbsc/trau_frame.h
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+#ifndef _TRAU_FRAME_H
+#define _TRAU_FRAME_H
+/* TRAU frame handling according to GSM TS 08.60 */
+
+/* (C) 2009 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 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 <sys/types.h>
+
+/* 21 for FR/EFR, 25 for AMR, 15 for OM, 15 for data, 13 for E-data, 21 idle */
+#define MAX_C_BITS 25
+/* 260 for FR/EFR, 256 for AMR, 264 for OM, 288 for E-data */
+#define MAX_D_BITS 288
+/* for all speech frames */
+#define MAX_T_BITS 4
+/* for OM */
+#define MAX_S_BITS 6
+/* for E-data */
+#define MAX_M_BITS 2
+
+struct decoded_trau_frame {
+ u_int8_t c_bits[MAX_C_BITS];
+ u_int8_t d_bits[MAX_D_BITS];
+ u_int8_t t_bits[MAX_T_BITS];
+ u_int8_t s_bits[MAX_S_BITS];
+ u_int8_t m_bits[MAX_M_BITS];
+};
+
+#define TRAU_FT_FR_UP 0x02 /* 0 0 0 1 0 - 3.5.1.1.1 */
+#define TRAU_FT_FR_DOWN 0x1c /* 1 1 1 0 0 - 3.5.1.1.1 */
+#define TRAU_FT_EFR 0x1a /* 1 1 0 1 0 - 3.5.1.1.1 */
+#define TRAU_FT_AMR 0x06 /* 0 0 1 1 0 - 3.5.1.2 */
+#define TRAU_FT_OM_UP 0x07 /* 0 0 1 0 1 - 3.5.2 */
+#define TRAU_FT_OM_DOWN 0x1b /* 1 1 0 1 1 - 3.5.2 */
+#define TRAU_FT_DATA_UP 0x08 /* 0 1 0 0 0 - 3.5.3 */
+#define TRAU_FT_DATA_DOWN 0x16 /* 1 0 1 1 0 - 3.5.3 */
+#define TRAU_FT_D145_SYNC 0x14 /* 1 0 1 0 0 - 3.5.3 */
+#define TRAU_FT_EDATA 0x1f /* 1 1 1 1 1 - 3.5.4 */
+#define TRAU_FT_IDLE_UP 0x10 /* 1 0 0 0 0 - 3.5.5 */
+#define TRAU_FT_IDLE_DOWN 0x0e /* 0 1 1 1 0 - 3.5.5 */
+
+
+int decode_trau_frame(struct decoded_trau_frame *fr, const u_int8_t *trau_bits);
+int encode_trau_frame(u_int8_t *trau_bits, const struct decoded_trau_frame *fr);
+int trau_frame_up2down(struct decoded_trau_frame *fr);
+u_int8_t *trau_idle_frame(void);
+
+
+#endif /* _TRAU_FRAME_H */