Philipp Maier | 889fe7f | 2020-07-06 17:44:12 +0200 | [diff] [blame^] | 1 | /* E1 traffic handling */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * Author: Philipp Maier |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <osmocom/mgcp/mgcp_internal.h> |
| 25 | #include <osmocom/mgcp/mgcp_endp.h> |
| 26 | #include <osmocom/mgcp/mgcp_trunk.h> |
| 27 | #include <osmocom/mgcp/mgcp_conn.h> |
| 28 | #include <osmocom/core/msgb.h> |
| 29 | #include <osmocom/abis/e1_input.h> |
| 30 | #include <osmocom/abis/abis.h> |
| 31 | |
| 32 | #include <osmocom/trau/trau_sync.h> |
| 33 | #include <osmocom/trau/trau_frame.h> |
| 34 | #include <osmocom/trau/trau_rtp.h> |
| 35 | #include <osmocom/mgcp/mgcp_conn.h> |
| 36 | #include <osmocom/netif/rtp.h> |
| 37 | #include <osmocom/mgcp/debug.h> |
| 38 | #include <osmocom/mgcp/mgcp_e1.h> |
| 39 | #include <osmocom/codec/codec.h> |
| 40 | |
| 41 | #define DEBUG_BITS_MAX 80 |
| 42 | #define DEBUG_BYTES_MAX 40 |
| 43 | #define DEBUG_E1_TS 0 |
| 44 | #define E1_TS_BYTES 160 |
| 45 | #define E1_TRAU_BITS 320 |
| 46 | #define E1_TRAU_BITS_MSGB 2048 |
| 47 | |
| 48 | static struct mgcp_config *cfg; |
| 49 | |
| 50 | static const struct e1inp_line_ops dummy_e1_line_ops = { |
| 51 | .sign_link_up = NULL, |
| 52 | .sign_link_down = NULL, |
| 53 | .sign_link = NULL, |
| 54 | }; |
| 55 | |
| 56 | /* EFR idle frame */ |
| 57 | static const ubit_t idle_tf_efr[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 58 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 59 | 1, 1, 1, 0, 1, 0, 0, 0, |
| 60 | 0, 0, 0, 0, 1, 0, 0, 0, |
| 61 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 62 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 63 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 64 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 65 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 66 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 67 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 68 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 69 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 70 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 71 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 72 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 73 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 74 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 75 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 76 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 77 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 78 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 79 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 80 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 81 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 82 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 83 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 84 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 85 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 86 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 87 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 88 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 89 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 90 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 91 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 92 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 93 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 94 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 95 | 1, 0, 0, 0, 0, 0, 1, 0, |
| 96 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 97 | }; |
| 98 | |
| 99 | /* FR idle frame */ |
| 100 | static const ubit_t idle_tf_fr[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 101 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 102 | 1, 1, 1, 1, 0, 0, 0, 0, |
| 103 | 0, 0, 0, 0, 1, 0, 0, 0, |
| 104 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 105 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 106 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 107 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 108 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 109 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 110 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 111 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 112 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 113 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 114 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 115 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 116 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 117 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 118 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 119 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 120 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 121 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 122 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 123 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 124 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 125 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 126 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 127 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 128 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 129 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 130 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 131 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 132 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 133 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 134 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 135 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 136 | 1, 0, 0, 0, 0, 0, 0, 0, |
| 137 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 138 | 1, 0, 0, 0, 0, 0, 1, 0, |
| 139 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 140 | }; |
| 141 | |
| 142 | /* Idle speech frame, see also GSM 08.60, chapter 3.4 */ |
| 143 | static const ubit_t idle_tf_spch[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 144 | 0, 0, 0, 0, 0, 0, 0, 0, |
| 145 | 1, 0, 1, 1, 1, 0, 0, 0, |
| 146 | 0, 0, 0, 0, 1, 0, 0, 0, |
| 147 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 148 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 149 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 150 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 151 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 152 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 153 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 154 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 155 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 156 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 157 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 158 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 159 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 160 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 161 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 162 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 163 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 164 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 165 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 166 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 167 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 168 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 169 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 170 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 171 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 172 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 173 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 174 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 175 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 176 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 177 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 178 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 179 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 180 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 181 | 1, 1, 1, 1, 1, 1, 1, 0, |
| 182 | 1, 1, 1, 1, 1, 1, 1, 1, |
| 183 | }; |
| 184 | |
| 185 | /* If the RTP transmission has dropouts for some reason the I.460 TX-Queue may |
| 186 | * run empty. In order to make sure that the TRAU frame transmission continues |
| 187 | * we generate idle TRAU frames here. */ |
| 188 | static void e1_i460_mux_empty_cb(struct osmo_i460_subchan *schan, void *user_data) |
| 189 | { |
| 190 | struct mgcp_endpoint *endp = user_data; |
| 191 | struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| 192 | struct msgb *msg = msgb_alloc(E1_TRAU_BITS_MSGB, "E1-I.460-IDLE-TX-TRAU-frame"); |
| 193 | uint8_t *ptr; |
| 194 | const uint8_t *ptr_ft; |
| 195 | enum osmo_trau_frame_type ft; |
| 196 | |
| 197 | rate_ctr_inc(&rate_ctrs->ctr[E1_I460_TRAU_MUX_EMPTY_CTR]); |
| 198 | |
| 199 | /* Choose an appropiate idle frame type */ |
| 200 | ft = endp->e1.trau_rtp_st->type; |
| 201 | switch (ft) { |
| 202 | case OSMO_TRAU16_FT_FR: |
| 203 | ptr_ft = idle_tf_fr; |
| 204 | break; |
| 205 | case OSMO_TRAU16_FT_EFR: |
| 206 | ptr_ft = idle_tf_efr; |
| 207 | break; |
| 208 | default: |
| 209 | /* FIXME: What about 8k subslots and AMR frames? */ |
| 210 | ptr_ft = idle_tf_spch; |
| 211 | } |
| 212 | |
| 213 | /* Put the replacement into a message buffer and enqueue it into the |
| 214 | * I.460 multiplexer */ |
| 215 | ptr = msgb_put(msg, E1_TRAU_BITS); |
| 216 | memcpy(ptr, ptr_ft, E1_TRAU_BITS); |
| 217 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-IDLE-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg), |
| 218 | osmo_ubit_dump(msgb_data(msg), msgb_length(msg) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg))); |
| 219 | osmo_i460_mux_enqueue(endp->e1.schan, msg); |
| 220 | } |
| 221 | |
| 222 | /* called by I.460 de-multeiplexer; feed output of I.460 demux into TRAU frame sync */ |
| 223 | static void e1_i460_demux_bits_cb(struct osmo_i460_subchan *schan, void *user_data, const ubit_t *bits, |
| 224 | unsigned int num_bits) |
| 225 | { |
| 226 | struct mgcp_endpoint *endp = user_data; |
| 227 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u bits from subslot: %s...\n", num_bits, |
| 228 | osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits)); |
| 229 | |
| 230 | OSMO_ASSERT(endp->e1.trau_sync_fi); |
| 231 | osmo_trau_sync_rx_ubits(endp->e1.trau_sync_fi, bits, num_bits); |
| 232 | } |
| 233 | |
| 234 | /* called for each synchronized TRAU frame received; decode frame + convert to RTP |
| 235 | * (the resulting frame will be prepended with an all-zero (12-byte) rtp header) */ |
| 236 | static void sync_frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits) |
| 237 | { |
| 238 | struct msgb *msg = msgb_alloc(RTP_BUF_SIZE, "RTP-rx-from-E1"); |
| 239 | unsigned int rtp_hdr_len = sizeof(struct rtp_hdr); |
| 240 | struct mgcp_endpoint *endp = user_data; |
| 241 | struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| 242 | struct mgcp_conn *conn_dst; |
| 243 | struct osmo_trau_frame fr; |
| 244 | int rc; |
| 245 | |
| 246 | if (!bits || num_bits == 0) |
| 247 | goto skip; |
| 248 | |
| 249 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u TRAU frame bits from E1 subslot: %s...\n", |
| 250 | num_bits, osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits)); |
| 251 | |
| 252 | /* Decode TRAU frame */ |
| 253 | switch (endp->e1.scd.rate) { |
| 254 | case OSMO_I460_RATE_8k: |
| 255 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 8k trau frame...\n"); |
| 256 | rc = osmo_trau_frame_decode_8k(&fr, bits, OSMO_TRAU_DIR_UL); |
| 257 | break; |
| 258 | case OSMO_I460_RATE_16k: |
| 259 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 16k trau frame...\n"); |
| 260 | rc = osmo_trau_frame_decode_16k(&fr, bits, OSMO_TRAU_DIR_UL); |
| 261 | break; |
| 262 | default: |
| 263 | /* TRAU frames only exist in 8K or 16K subslots. */ |
| 264 | OSMO_ASSERT(false); |
| 265 | break; |
| 266 | } |
| 267 | if (rc != 0) { |
| 268 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to decode trau frame\n"); |
| 269 | goto skip; |
| 270 | } |
| 271 | |
| 272 | /* Check if the payload type is supported and what the expected lenth |
| 273 | * of the RTP payload will be. */ |
| 274 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoded trau frame type: %s\n", |
| 275 | osmo_trau_frame_type_name(fr.type)); |
| 276 | |
| 277 | /* Convert decoded trau frame to RTP frame */ |
| 278 | struct osmo_trau2rtp_state t2rs = { |
| 279 | .type = fr.type, |
| 280 | }; |
| 281 | rc = osmo_trau2rtp(msgb_data(msg) + rtp_hdr_len, msg->data_len - rtp_hdr_len, &fr, &t2rs); |
| 282 | if (rc <= 0) { |
| 283 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to convert trau frame to RTP audio\n"); |
| 284 | goto skip; |
| 285 | } |
| 286 | msgb_put(msg, rtp_hdr_len + rc); |
| 287 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: encoded %u bytes of RTP audio: %s\n", rc, |
| 288 | osmo_hexdump(msgb_data(msg) + rtp_hdr_len, msgb_length(msg) - rtp_hdr_len)); |
| 289 | |
| 290 | /* Forward RTP data to IP */ |
| 291 | conn_dst = llist_first_entry(&endp->conns, struct mgcp_conn, entry); |
| 292 | if (!conn_dst) { |
| 293 | LOGPENDP(endp, DE1, LOGL_DEBUG, |
| 294 | "E1-I.460-RX: unable to forward RTP audio data from E1: no connection to forward an incoming RTP packet to\n"); |
| 295 | goto skip; |
| 296 | } |
| 297 | OSMO_ASSERT(conn_dst->type == MGCP_CONN_TYPE_RTP); |
| 298 | |
| 299 | mgcp_send(endp, 1, NULL, msg, &conn_dst->u.rtp, &conn_dst->u.rtp); |
| 300 | |
| 301 | msgb_free(msg); |
| 302 | return; |
| 303 | skip: |
| 304 | rate_ctr_inc(&rate_ctrs->ctr[E1_I460_TRAU_RX_FAIL_CTR]); |
| 305 | msgb_free(msg); |
| 306 | return; |
| 307 | } |
| 308 | |
| 309 | /* Function to handle outgoing E1 traffic */ |
| 310 | static void e1_send(struct e1inp_ts *ts, struct mgcp_trunk *trunk) |
| 311 | { |
| 312 | struct msgb *msg = msgb_alloc(E1_TS_BYTES, "E1-TX-timeslot-bytes"); |
| 313 | uint8_t *ptr; |
| 314 | |
| 315 | /* Get E1 frame from I.460 multiplexer */ |
| 316 | ptr = msgb_put(msg, E1_TS_BYTES); |
| 317 | osmo_i460_mux_out(&trunk->e1.i460_ts[ts->num - 1], ptr, E1_TS_BYTES); |
| 318 | |
| 319 | #if DEBUG_E1_TS == 1 |
| 320 | LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-TX: (ts:%u) sending %u bytes: %s...\n", ts->num, msgb_length(msg), |
| 321 | osmo_hexdump_nospc(msgb_data(msg), |
| 322 | msgb_length(msg) > DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg))); |
| 323 | #endif |
| 324 | /* Hand data over to the E1 stack */ |
| 325 | msgb_enqueue(&ts->raw.tx_queue, msg); |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /* Callback function to handle incoming E1 traffic */ |
| 330 | static void e1_recv_cb(struct e1inp_ts *ts, struct msgb *msg) |
| 331 | { |
| 332 | struct mgcp_trunk *trunk; |
| 333 | |
| 334 | /* Find associated trunk */ |
| 335 | trunk = mgcp_trunk_by_line_num(cfg, ts->line->num); |
| 336 | if (!trunk) { |
| 337 | LOGP(DE1, LOGL_DEBUG, "E1-RX: unable to find a trunk for E1-line %u!\n", ts->line->num); |
| 338 | return; |
| 339 | } |
| 340 | |
| 341 | /* Check if the incoming data looks sane */ |
| 342 | if (msgb_length(msg) != E1_TS_BYTES) { |
| 343 | LOGPTRUNK(trunk, DE1, LOGL_NOTICE, |
| 344 | "E1-RX: (ts:%u) expected length is %u, actual length is %u!\n", ts->num, E1_TS_BYTES, |
| 345 | msgb_length(msg)); |
| 346 | } |
| 347 | #if DEBUG_E1_TS == 1 |
| 348 | LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-RX: (ts:%u) receiving %u bytes: %s...\n", ts->num, |
| 349 | msgb_length(msg), osmo_hexdump_nospc(msgb_data(msg), |
| 350 | msgb_length(msg) > |
| 351 | DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg))); |
| 352 | #endif |
| 353 | |
| 354 | /* Hand data over to the I.460 demultiplexer. */ |
| 355 | osmo_i460_demux_in(&trunk->e1.i460_ts[ts->num - 1], msgb_data(msg), msgb_length(msg)); |
| 356 | |
| 357 | /* Trigger sending of pending E1 traffic */ |
| 358 | e1_send(ts, trunk); |
| 359 | } |
| 360 | |
| 361 | /*! Find an endpoint by its name on a specified trunk. |
| 362 | * \param[in] trunk trunk configuration. |
| 363 | * \param[in] ts_nr E1 timeslot number. |
| 364 | * \returns -EINVAL on failure, 0 on success. */ |
| 365 | int mgcp_e1_init(struct mgcp_trunk *trunk, uint8_t ts_nr) |
| 366 | { |
| 367 | /*! Each timeslot needs only to be configured once. The Timeslot then |
| 368 | * stays open and permanently receives data. It is then up to the |
| 369 | * I.460 demultiplexer to add/remove subchannels as needed. It is |
| 370 | * allowed to call this function multiple times since we check if the |
| 371 | * timeslot is already configured. */ |
| 372 | |
| 373 | struct e1inp_line *e1_line; |
| 374 | int rc; |
| 375 | |
| 376 | OSMO_ASSERT(ts_nr > 0 || ts_nr < NUM_E1_TS); |
| 377 | cfg = trunk->cfg; |
| 378 | |
| 379 | if (trunk->e1.ts_in_use[ts_nr - 1]) { |
| 380 | LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1 timeslot %u already set up, skipping...\n", ts_nr); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | /* Get E1 line */ |
| 385 | if (!trunk->e1.line) { |
| 386 | e1_line = e1inp_line_find(trunk->e1.vty_line_nr); |
| 387 | if (!e1_line) { |
| 388 | LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "no such E1 line %u - check VTY config!\n", |
| 389 | trunk->e1.vty_line_nr); |
| 390 | return -EINVAL; |
| 391 | } |
| 392 | e1inp_line_bind_ops(e1_line, &dummy_e1_line_ops); |
| 393 | } else |
| 394 | e1_line = trunk->e1.line; |
| 395 | if (!e1_line) |
| 396 | return -EINVAL; |
| 397 | |
| 398 | /* Configure E1 timeslot */ |
| 399 | rc = e1inp_ts_config_raw(&e1_line->ts[ts_nr - 1], e1_line, e1_recv_cb); |
| 400 | if (rc < 0) |
| 401 | return -EINVAL; |
| 402 | e1inp_line_update(e1_line); |
| 403 | if (rc < 0) |
| 404 | return -EINVAL; |
| 405 | |
| 406 | LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1 timeslot %u set up successfully.\n", ts_nr); |
| 407 | trunk->e1.ts_in_use[ts_nr - 1] = true; |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /* Determine a suitable TRAU frame type for a given codec */ |
| 413 | static enum osmo_trau_frame_type determine_trau_fr_type(char *sdp_subtype_name, enum osmo_i460_rate i460_rate, |
| 414 | uint8_t amr_ft, struct mgcp_endpoint *endp) |
| 415 | { |
| 416 | if (strcmp(sdp_subtype_name, "GSM") == 0) |
| 417 | return OSMO_TRAU16_FT_FR; |
| 418 | else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0) |
| 419 | return OSMO_TRAU16_FT_EFR; |
| 420 | else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0) |
| 421 | return OSMO_TRAU16_FT_HR; |
| 422 | else if (strcmp(sdp_subtype_name, "AMR") == 0) { |
| 423 | if (i460_rate == OSMO_I460_RATE_8k) { |
| 424 | switch (amr_ft) { |
| 425 | case AMR_4_75: |
| 426 | case AMR_5_15: |
| 427 | case AMR_5_90: |
| 428 | return OSMO_TRAU8_AMR_LOW; |
| 429 | case AMR_6_70: |
| 430 | return OSMO_TRAU8_AMR_6k7; |
| 431 | case AMR_7_40: |
| 432 | return OSMO_TRAU8_AMR_7k4; |
| 433 | default: |
| 434 | LOGPENDP(endp, DE1, LOGL_ERROR, |
| 435 | "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft); |
| 436 | return OSMO_TRAU_FT_NONE; |
| 437 | } |
| 438 | } |
| 439 | return OSMO_TRAU16_FT_AMR; |
| 440 | } else { |
| 441 | LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n", |
| 442 | sdp_subtype_name); |
| 443 | return OSMO_TRAU_FT_NONE; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | /* Determine a suitable TRAU frame type for a given codec */ |
| 448 | static enum osmo_tray_sync_pat_id determine_trau_sync_pat(char *sdp_subtype_name, enum osmo_i460_rate i460_rate, |
| 449 | uint8_t amr_ft, struct mgcp_endpoint *endp) |
| 450 | { |
| 451 | if (strcmp(sdp_subtype_name, "GSM") == 0) |
| 452 | return OSMO_TRAU_SYNCP_16_FR_EFR; |
| 453 | else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0) |
| 454 | return OSMO_TRAU_SYNCP_16_FR_EFR; |
| 455 | else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0) |
| 456 | return OSMO_TRAU_SYNCP_8_HR; |
| 457 | else if (strcmp(sdp_subtype_name, "AMR") == 0) { |
| 458 | if (i460_rate == OSMO_I460_RATE_8k) { |
| 459 | switch (amr_ft) { |
| 460 | case AMR_4_75: |
| 461 | case AMR_5_15: |
| 462 | case AMR_5_90: |
| 463 | return OSMO_TRAU_SYNCP_8_AMR_LOW; |
| 464 | case AMR_6_70: |
| 465 | return OSMO_TRAU_SYNCP_8_AMR_6K7; |
| 466 | case AMR_7_40: |
| 467 | return OSMO_TRAU_SYNCP_8_AMR_7K4; |
| 468 | default: |
| 469 | LOGPENDP(endp, DE1, LOGL_ERROR, |
| 470 | "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft); |
| 471 | return OSMO_TRAU_SYNCP_16_FR_EFR; |
| 472 | } |
| 473 | } |
| 474 | return OSMO_TRAU_SYNCP_16_FR_EFR; |
| 475 | } else { |
| 476 | LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n", |
| 477 | sdp_subtype_name); |
| 478 | return OSMO_TRAU_SYNCP_16_FR_EFR; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | /* Find out if a given TRAU frame type is AMR */ |
| 483 | static bool tf_type_is_amr(enum osmo_trau_frame_type ft) |
| 484 | { |
| 485 | |
| 486 | switch (ft) { |
| 487 | case OSMO_TRAU16_FT_AMR: |
| 488 | case OSMO_TRAU8_AMR_LOW: |
| 489 | case OSMO_TRAU8_AMR_6k7: |
| 490 | case OSMO_TRAU8_AMR_7k4: |
| 491 | return true; |
| 492 | default: |
| 493 | return false; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* !Equip E1 endpoint with I.460 mux resources. |
| 498 | * \param[in] endp endpoint to equip |
| 499 | * \param[in] ts E1 timeslot number. |
| 500 | * \param[in] ss E1 subslot number. |
| 501 | * \param[in] offset E1 bit offset. |
| 502 | * \returns 0 on success, -EINVAL on error. */ |
| 503 | int mgcp_e1_endp_equip(struct mgcp_endpoint *endp, uint8_t ts, uint8_t ss, uint8_t offs) |
| 504 | { |
| 505 | int rc; |
| 506 | enum osmo_tray_sync_pat_id sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR; |
| 507 | |
| 508 | OSMO_ASSERT(ts != 0); |
| 509 | OSMO_ASSERT(ts != 0xFF); |
| 510 | OSMO_ASSERT(ss != 0xFF); |
| 511 | OSMO_ASSERT(offs != 0xFF); |
| 512 | |
| 513 | memset(&endp->e1, 0, sizeof(endp->e1)); |
| 514 | |
| 515 | endp->e1.last_amr_ft = AMR_4_75; |
| 516 | |
| 517 | /* Set up E1 line / timeslot */ |
| 518 | rc = mgcp_e1_init(endp->trunk, ts); |
| 519 | if (rc != 0) |
| 520 | return -EINVAL; |
| 521 | |
| 522 | /* Set up I.460 mux */ |
| 523 | switch (e1_rates[ss]) { |
| 524 | case 64: |
| 525 | endp->e1.scd.rate = OSMO_I460_RATE_64k; |
| 526 | endp->e1.scd.demux.num_bits = 160 * 8; |
| 527 | break; |
| 528 | case 32: |
| 529 | endp->e1.scd.rate = OSMO_I460_RATE_32k; |
| 530 | endp->e1.scd.demux.num_bits = 80 * 8; |
| 531 | break; |
| 532 | case 16: |
| 533 | endp->e1.scd.rate = OSMO_I460_RATE_16k; |
| 534 | endp->e1.scd.demux.num_bits = 40 * 8; |
| 535 | sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR; |
| 536 | break; |
| 537 | case 8: |
| 538 | endp->e1.scd.rate = OSMO_I460_RATE_8k; |
| 539 | endp->e1.scd.demux.num_bits = 20 * 8; |
| 540 | sync_pat_id = OSMO_TRAU_SYNCP_8_HR; |
| 541 | break; |
| 542 | } |
| 543 | endp->e1.scd.bit_offset = offs; |
| 544 | endp->e1.scd.demux.out_cb_bits = e1_i460_demux_bits_cb; |
| 545 | endp->e1.scd.demux.out_cb_bytes = NULL; |
| 546 | endp->e1.scd.demux.user_data = endp; |
| 547 | endp->e1.scd.mux.in_cb_queue_empty = e1_i460_mux_empty_cb; |
| 548 | endp->e1.scd.mux.user_data = endp; |
| 549 | |
| 550 | LOGPENDP(endp, DE1, LOGL_DEBUG, "adding I.460 subchannel: ts=%u, bit_offset=%u, rate=%uk, num_bits=%lu\n", ts, |
| 551 | offs, e1_rates[ss], endp->e1.scd.demux.num_bits); |
| 552 | endp->e1.schan = osmo_i460_subchan_add(endp, &endp->trunk->e1.i460_ts[ts - 1], &endp->e1.scd); |
| 553 | if (!endp->e1.schan) { |
| 554 | LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 subchannel: failed!\n"); |
| 555 | return -EINVAL; |
| 556 | } |
| 557 | |
| 558 | if (endp->e1.scd.rate == OSMO_I460_RATE_16k || endp->e1.scd.rate == OSMO_I460_RATE_8k) { |
| 559 | /* TRAU frames are only specified for 16k and 8k subslots. For all other subslot |
| 560 | * types the concept of TRAU frames does not apply. However, at the moment this |
| 561 | * is the only format we currently support in osmo-mgw */ |
| 562 | endp->e1.trau_sync_fi = osmo_trau_sync_alloc(endp, "trau-sync", sync_frame_out_cb, sync_pat_id, endp); |
| 563 | if (!endp->e1.trau_sync_fi) { |
| 564 | LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 TRAU frame sync: failed!\n"); |
| 565 | return -EINVAL; |
| 566 | } |
| 567 | endp->e1.trau_rtp_st = talloc_zero(endp->e1.trau_sync_fi, struct osmo_trau2rtp_state); |
| 568 | endp->e1.trau_rtp_st->type = OSMO_TRAU_FT_NONE; |
| 569 | } else { |
| 570 | LOGPENDP(endp, DE1, LOGL_ERROR, |
| 571 | "osmo-mgw currently only supports 16K and 8K subslots (TRAU frames)!\n"); |
| 572 | return -EINVAL; |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | /*! Update E1 related parameters (codec and sync pattern). |
| 579 | * \param[in] endp endpoint to update. */ |
| 580 | void mgcp_e1_endp_update(struct mgcp_endpoint *endp) |
| 581 | { |
| 582 | struct mgcp_conn *conn; |
| 583 | struct mgcp_rtp_codec *codec; |
| 584 | enum osmo_tray_sync_pat_id sync_pat_id; |
| 585 | |
| 586 | /* In order to determine the codec, find the oldest connection on |
| 587 | * the endpoint and use its codec information. Normally on an E1 |
| 588 | * endpoint no more than one connection should exist. */ |
| 589 | conn = mgcp_conn_get_oldest(endp); |
| 590 | OSMO_ASSERT(conn); |
| 591 | codec = conn->u.rtp.end.codec; |
| 592 | OSMO_ASSERT(codec); |
| 593 | |
| 594 | /* Update codec information */ |
| 595 | endp->e1.trau_rtp_st->type = |
| 596 | determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp); |
| 597 | endp->e1.last_codec = codec; |
| 598 | |
| 599 | /* Update sync pattern */ |
| 600 | sync_pat_id = determine_trau_sync_pat(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp); |
| 601 | osmo_trau_sync_set_pat(endp->e1.trau_sync_fi, sync_pat_id); |
| 602 | } |
| 603 | |
| 604 | /*! Remove E1 resources from endpoint |
| 605 | * \param[in] endp endpoint to release. */ |
| 606 | void mgcp_e1_endp_release(struct mgcp_endpoint *endp) |
| 607 | { |
| 608 | LOGPENDP(endp, DE1, LOGL_DEBUG, "removing I.460 subchannel and sync...\n"); |
| 609 | |
| 610 | if (endp->e1.schan) |
| 611 | osmo_i460_subchan_del(endp->e1.schan); |
| 612 | if (endp->e1.trau_rtp_st) |
| 613 | talloc_free(endp->e1.trau_rtp_st); |
| 614 | if (endp->e1.trau_sync_fi) |
| 615 | osmo_fsm_inst_term(endp->e1.trau_sync_fi, OSMO_FSM_TERM_REGULAR, NULL); |
| 616 | |
| 617 | memset(&endp->e1, 0, sizeof(endp->e1)); |
| 618 | } |
| 619 | |
| 620 | /*! Accept RTP message buffer with RTP data and enqueue voice data for E1 transmit. |
| 621 | * \param[in] endp related endpoint (does not take ownership). |
| 622 | * \param[in] codec configuration. |
| 623 | * \param[in] msg RTP message buffer (including RTP header). |
| 624 | * \returns 0 on success, -1 on ERROR. */ |
| 625 | int mgcp_e1_send_rtp(struct mgcp_endpoint *endp, struct mgcp_rtp_codec *codec, struct msgb *msg) |
| 626 | { |
| 627 | struct msgb *msg_tf = msgb_alloc(E1_TRAU_BITS_MSGB, "E1-I.460-TX-TRAU-frame"); |
| 628 | struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| 629 | unsigned int rtp_hdr_len = sizeof(struct rtp_hdr); |
| 630 | struct osmo_trau_frame tf; |
| 631 | uint8_t amr_ft; |
| 632 | int rc; |
| 633 | |
| 634 | /* Extract AMR frame type from AMR head (if AMR is used) */ |
| 635 | if (tf_type_is_amr(endp->e1.trau_rtp_st->type)) |
| 636 | amr_ft = (msgb_data(msg)[rtp_hdr_len + 1] >> 3) & 0xf; |
| 637 | else |
| 638 | amr_ft = 0xff; |
| 639 | |
| 640 | /* Adapt TRAU frame type on codec changes */ |
| 641 | OSMO_ASSERT(endp->e1.last_codec); |
| 642 | if (codec != endp->e1.last_codec || (amr_ft != 0xff && amr_ft != endp->e1.last_amr_ft)) { |
| 643 | endp->e1.trau_rtp_st->type = |
| 644 | determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, amr_ft, endp); |
| 645 | endp->e1.last_codec = codec; |
| 646 | endp->e1.last_amr_ft = amr_ft; |
| 647 | } |
| 648 | if (endp->e1.trau_rtp_st->type == OSMO_TRAU_FT_NONE) |
| 649 | goto skip; |
| 650 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: using trau frame type for encoding: %s\n", |
| 651 | osmo_trau_frame_type_name(endp->e1.trau_rtp_st->type)); |
| 652 | |
| 653 | /* Convert from RTP to TRAU format */ |
| 654 | msg->l2h = msgb_data(msg) + rtp_hdr_len; |
| 655 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: decoding %u bytes of RTP audio to TRAU format: %s\n", |
| 656 | msgb_length(msg), osmo_hexdump(msgb_l2(msg), msgb_l2len(msg))); |
| 657 | memset(&tf, 0, sizeof(tf)); |
| 658 | tf.dir = OSMO_TRAU_DIR_DL; |
| 659 | rc = osmo_rtp2trau(&tf, msgb_l2(msg), msgb_l2len(msg), endp->e1.trau_rtp_st); |
| 660 | if (rc < 0) { |
| 661 | LOGPENDP(endp, DE1, LOGL_DEBUG, |
| 662 | "E1-I.460-TX: failed to decode from RTP payload format to TRAU format\n"); |
| 663 | goto skip; |
| 664 | } |
| 665 | rc = osmo_trau_frame_encode(msgb_data(msg_tf), msg_tf->data_len, &tf); |
| 666 | if (rc < 0) { |
| 667 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: failed to encode TRAU frame\n"); |
| 668 | goto skip; |
| 669 | } |
| 670 | msgb_put(msg_tf, rc); |
| 671 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg_tf), |
| 672 | osmo_ubit_dump(msgb_data(msg_tf), |
| 673 | msgb_length(msg_tf) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg_tf))); |
| 674 | |
| 675 | /* Enqueue data to I.460 multiplexer */ |
| 676 | OSMO_ASSERT(endp->e1.schan); |
| 677 | OSMO_ASSERT(endp->e1.trau_sync_fi); |
| 678 | |
| 679 | osmo_i460_mux_enqueue(endp->e1.schan, msg_tf); |
| 680 | LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: %u bits of audio enqued for E1 tx\n", msgb_length(msg_tf)); |
| 681 | |
| 682 | return 0; |
| 683 | skip: |
| 684 | rate_ctr_inc(&rate_ctrs->ctr[E1_I460_TRAU_TX_FAIL_CTR]); |
| 685 | msgb_free(msg_tf); |
| 686 | return -1; |
| 687 | } |