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-rw-r--r--src/trau_frame.c255
1 files changed, 0 insertions, 255 deletions
diff --git a/src/trau_frame.c b/src/trau_frame.c
deleted file mode 100644
index aa039574b..000000000
--- a/src/trau_frame.c
+++ /dev/null
@@ -1,255 +0,0 @@
-/* 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 General Public License as published by
- * the Free Software Foundation; either version 2 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 General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- */
-
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-
-#include <openbsc/trau_frame.h>
-#include <openbsc/subchan_demux.h>
-#include <openbsc/debug.h>
-
-static u_int32_t get_bits(const u_int8_t *bitbuf, int offset, int num)
-{
- int i;
- u_int32_t ret = 0;
-
- for (i = offset; i < offset + num; i++) {
- ret = ret << 1;
- if (bitbuf[i])
- ret |= 1;
- }
- return ret;
-}
-
-/* Decode according to 3.1.1 */
-static void decode_fr(struct decoded_trau_frame *fr, const u_int8_t *trau_bits)
-{
- int i;
- int d_idx = 0;
-
- /* C1 .. C15 */
- memcpy(fr->c_bits+0, trau_bits+17, 15);
- /* C16 .. C21 */
- memcpy(fr->c_bits+15, trau_bits+310, 6);
- /* T1 .. T4 */
- memcpy(fr->t_bits+0, trau_bits+316, 4);
- /* D1 .. D255 */
- for (i = 32; i < 304; i+= 16) {
- memcpy(fr->d_bits + d_idx, trau_bits+i+1, 15);
- d_idx += 15;
- }
- /* D256 .. D260 */
- memcpy(fr->d_bits + d_idx, trau_bits + 305, 5);
-}
-
-/* Decode according to 3.1.2 */
-static void decode_amr(struct decoded_trau_frame *fr, const u_int8_t *trau_bits)
-{
- int i;
- int d_idx = 0;
-
- /* C1 .. C15 */
- memcpy(fr->c_bits+0, trau_bits+17, 15);
- /* C16 .. C25 */
- memcpy(fr->c_bits+15, trau_bits+33, 10);
- /* T1 .. T4 */
- memcpy(fr->t_bits+0, trau_bits+316, 4);
- /* D1 .. D5 */
- memcpy(fr->d_bits, trau_bits+43, 5);
- /* D6 .. D245 */
- for (i = 48; i < 304; i += 16) {
- memcpy(fr->d_bits + d_idx, trau_bits+i+1, 15);
- d_idx += 15;
- }
- /* D246 .. D256 */
- memcpy(fr->d_bits + d_idx, trau_bits + 305, 11);
-}
-
-int decode_trau_frame(struct decoded_trau_frame *fr, const u_int8_t *trau_bits)
-{
- u_int8_t cbits5 = get_bits(trau_bits, 17, 5);
-
- switch (cbits5) {
- case TRAU_FT_FR_UP:
- case TRAU_FT_FR_DOWN:
- case TRAU_FT_IDLE_UP:
- case TRAU_FT_IDLE_DOWN:
- case TRAU_FT_EFR:
- decode_fr(fr, trau_bits);
- break;
- case TRAU_FT_AMR:
- decode_amr(fr, trau_bits);
- break;
- case TRAU_FT_OM_UP:
- case TRAU_FT_OM_DOWN:
- case TRAU_FT_DATA_UP:
- case TRAU_FT_DATA_DOWN:
- case TRAU_FT_D145_SYNC:
- case TRAU_FT_EDATA:
- DEBUGP(DMUX, "can't decode unimplemented TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- default:
- DEBUGP(DMUX, "can't decode unknown TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- }
-
- return 0;
-}
-
-const u_int8_t ft_fr_down_bits[] = { 1, 1, 1, 0, 0 };
-const u_int8_t ft_idle_down_bits[] = { 0, 1, 1, 1, 0 };
-
-/* modify an uplink TRAU frame so we can send it downlink */
-int trau_frame_up2down(struct decoded_trau_frame *fr)
-{
- u_int8_t cbits5 = get_bits(fr->c_bits, 0, 5);
-
- switch (cbits5) {
- case TRAU_FT_FR_UP:
- memcpy(fr->c_bits, ft_fr_down_bits, 5);
- /* clear time alignment */
- memset(fr->c_bits+5, 0, 6);
- /* FIXME: SP / BFI in case of DTx */
- /* C12 .. C21 are spare and coded as '1' */
- memset(fr->c_bits+11, 0x01, 10);
- break;
- case TRAU_FT_EFR:
- /* clear time alignment */
- memset(fr->c_bits+5, 0, 6);
- /* FIXME: set UFE appropriately */
- /* FIXME: SP / BFI in case of DTx */
- break;
- case TRAU_FT_IDLE_UP:
- memcpy(fr->c_bits, ft_idle_down_bits, 5);
- /* clear time alignment */
- memset(fr->c_bits+5, 0, 6);
- /* FIXME: SP / BFI in case of DTx */
- /* C12 .. C21 are spare and coded as '1' */
- memset(fr->c_bits+11, 0x01, 10);
- break;
- case TRAU_FT_FR_DOWN:
- case TRAU_FT_IDLE_DOWN:
- case TRAU_FT_OM_DOWN:
- case TRAU_FT_DATA_DOWN:
- /* we cannot convert a downlink to a downlink frame */
- return -EINVAL;
- break;
- case TRAU_FT_AMR:
- case TRAU_FT_OM_UP:
- case TRAU_FT_DATA_UP:
- case TRAU_FT_D145_SYNC:
- case TRAU_FT_EDATA:
- DEBUGP(DMUX, "unimplemented TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- default:
- DEBUGP(DMUX, "unknown TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- }
-
- return 0;
-
-}
-
-static void encode_fr(u_int8_t *trau_bits, const struct decoded_trau_frame *fr)
-{
- int i;
- int d_idx = 0;
-
- trau_bits[16] = 1;
- /* C1 .. C15 */
- memcpy(trau_bits+17, fr->c_bits+0, 15);
- /* D1 .. D255 */
- for (i = 32; i < 304; i+= 16) {
- trau_bits[i] = 1;
- memcpy(trau_bits+i+1, fr->d_bits + d_idx, 15);
- d_idx += 15;
- }
- /* D256 .. D260 */
- trau_bits[304] = 1;
- memcpy(trau_bits + 305, fr->d_bits + d_idx, 5);
- /* C16 .. C21 */
- memcpy(trau_bits+310, fr->c_bits+15, 6);
-
- /* FIXME: handle timing adjustment */
-
- /* T1 .. T4 */
- memcpy(trau_bits+316, fr->t_bits+0, 4);
-}
-
-
-int encode_trau_frame(u_int8_t *trau_bits, const struct decoded_trau_frame *fr)
-{
- u_int8_t cbits5 = get_bits(fr->c_bits, 0, 5);
-
- /* 16 bits of sync header */
- memset(trau_bits, 0, 16);
-
- switch (cbits5) {
- case TRAU_FT_FR_UP:
- case TRAU_FT_FR_DOWN:
- case TRAU_FT_IDLE_UP:
- case TRAU_FT_IDLE_DOWN:
- case TRAU_FT_EFR:
- encode_fr(trau_bits, fr);
- break;
- case TRAU_FT_AMR:
- case TRAU_FT_OM_UP:
- case TRAU_FT_OM_DOWN:
- case TRAU_FT_DATA_UP:
- case TRAU_FT_DATA_DOWN:
- case TRAU_FT_D145_SYNC:
- case TRAU_FT_EDATA:
- DEBUGP(DMUX, "unimplemented TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- default:
- DEBUGP(DMUX, "unknown TRAU Frame Type 0x%02x\n", cbits5);
- return -1;
- break;
- }
-
- return 0;
-}
-
-static struct decoded_trau_frame fr_idle_frame = {
- .c_bits = { 0, 1, 1, 1, 0 }, /* IDLE DOWNLINK 3.5.5 */
- .t_bits = { 1, 1, 1, 1 },
-};
-static u_int8_t encoded_idle_frame[TRAU_FRAME_BITS];
-static int dbits_initted;
-
-u_int8_t *trau_idle_frame(void)
-{
- /* only initialize during the first call */
- if (!dbits_initted) {
- /* set all D-bits to 1 */
- memset(&fr_idle_frame.d_bits, 0x01, 260);
- encode_fr(encoded_idle_frame, &fr_idle_frame);
- }
- return encoded_idle_frame;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 16:45:06 +0000