| /* E1 traffic handling */ |
| |
| /* |
| * (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Philipp Maier |
| * |
| * 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 <inttypes.h> |
| |
| #include <osmocom/mgcp/mgcp_protocol.h> |
| #include <osmocom/mgcp/mgcp.h> |
| #include <osmocom/mgcp/mgcp_endp.h> |
| #include <osmocom/mgcp/mgcp_trunk.h> |
| #include <osmocom/mgcp/mgcp_conn.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/abis/e1_input.h> |
| #include <osmocom/abis/abis.h> |
| |
| #include <osmocom/trau/trau_sync.h> |
| #include <osmocom/trau/trau_frame.h> |
| #include <osmocom/trau/trau_rtp.h> |
| #include <osmocom/mgcp/mgcp_conn.h> |
| #include <osmocom/netif/rtp.h> |
| #include <osmocom/mgcp/debug.h> |
| #include <osmocom/mgcp/mgcp_e1.h> |
| #include <osmocom/codec/codec.h> |
| |
| #define DEBUG_BITS_MAX 80 |
| #define DEBUG_BYTES_MAX 40 |
| #define DEBUG_E1_TS 0 |
| #define E1_TS_BYTES 160 |
| #define E1_TRAU_BITS 320 |
| #define E1_TRAU_BITS_MSGB 2048 |
| |
| static struct mgcp_config *cfg; |
| |
| static const struct e1inp_line_ops dummy_e1_line_ops = { |
| .sign_link_up = NULL, |
| .sign_link_down = NULL, |
| .sign_link = NULL, |
| }; |
| |
| /* EFR idle frame */ |
| static const ubit_t idle_tf_efr[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 1, 1, 0, 1, 0, 0, 0, |
| 0, 0, 0, 0, 1, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 1, 0, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| }; |
| |
| /* FR idle frame */ |
| static const ubit_t idle_tf_fr[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 1, 1, 1, 0, 0, 0, 0, |
| 0, 0, 0, 0, 1, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 0, 0, 0, 0, 1, 0, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| }; |
| |
| /* Idle speech frame, see also GSM 08.60, chapter 3.4 */ |
| static const ubit_t idle_tf_spch[] = { 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, |
| 1, 0, 1, 1, 1, 0, 0, 0, |
| 0, 0, 0, 0, 1, 0, 0, 0, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 0, |
| 1, 1, 1, 1, 1, 1, 1, 1, |
| }; |
| |
| /* If the RTP transmission has dropouts for some reason the I.460 TX-Queue may |
| * run empty. In order to make sure that the TRAU frame transmission continues |
| * we generate idle TRAU frames here. */ |
| static void e1_i460_mux_empty_cb(struct osmo_i460_subchan *schan, void *user_data) |
| { |
| struct mgcp_endpoint *endp = user_data; |
| struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| struct msgb *msg = msgb_alloc_c(endp->trunk, E1_TRAU_BITS_MSGB, "E1-I.460-IDLE-TX-TRAU-frame"); |
| uint8_t *ptr; |
| const uint8_t *ptr_ft; |
| enum osmo_trau_frame_type ft; |
| |
| rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_MUX_EMPTY_CTR)); |
| |
| /* Choose an appropiate idle frame type */ |
| ft = endp->e1.trau_rtp_st->type; |
| switch (ft) { |
| case OSMO_TRAU16_FT_FR: |
| ptr_ft = idle_tf_fr; |
| break; |
| case OSMO_TRAU16_FT_EFR: |
| ptr_ft = idle_tf_efr; |
| break; |
| default: |
| /* FIXME: What about 8k subslots and AMR frames? */ |
| ptr_ft = idle_tf_spch; |
| } |
| |
| /* Put the replacement into a message buffer and enqueue it into the |
| * I.460 multiplexer */ |
| ptr = msgb_put(msg, E1_TRAU_BITS); |
| memcpy(ptr, ptr_ft, E1_TRAU_BITS); |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-IDLE-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg), |
| osmo_ubit_dump(msgb_data(msg), msgb_length(msg) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg))); |
| osmo_i460_mux_enqueue(endp->e1.schan, msg); |
| } |
| |
| /* called by I.460 de-multeiplexer; feed output of I.460 demux into TRAU frame sync */ |
| static void e1_i460_demux_bits_cb(struct osmo_i460_subchan *schan, void *user_data, const ubit_t *bits, |
| unsigned int num_bits) |
| { |
| struct mgcp_endpoint *endp = user_data; |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u bits from subslot: %s...\n", num_bits, |
| osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits)); |
| |
| OSMO_ASSERT(endp->e1.trau_sync_fi); |
| osmo_trau_sync_rx_ubits(endp->e1.trau_sync_fi, bits, num_bits); |
| } |
| |
| /* called for each synchronized TRAU frame received; decode frame + convert to RTP |
| * (the resulting frame will be prepended with an all-zero (12-byte) rtp header) */ |
| static void sync_frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits) |
| { |
| unsigned int rtp_hdr_len = sizeof(struct rtp_hdr); |
| struct mgcp_endpoint *endp = user_data; |
| struct msgb *msg = msgb_alloc_c(endp->trunk, RTP_BUF_SIZE, "RTP-rx-from-E1"); |
| struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| struct mgcp_conn *conn_dst; |
| struct osmo_trau_frame fr; |
| int rc; |
| |
| if (!bits || num_bits == 0) |
| goto skip; |
| |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: receiving %u TRAU frame bits from E1 subslot: %s...\n", |
| num_bits, osmo_ubit_dump(bits, num_bits > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : num_bits)); |
| |
| /* Decode TRAU frame */ |
| switch (endp->e1.scd.rate) { |
| case OSMO_I460_RATE_8k: |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 8k trau frame...\n"); |
| rc = osmo_trau_frame_decode_8k(&fr, bits, OSMO_TRAU_DIR_UL); |
| break; |
| case OSMO_I460_RATE_16k: |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoding 16k trau frame...\n"); |
| rc = osmo_trau_frame_decode_16k(&fr, bits, OSMO_TRAU_DIR_UL); |
| break; |
| default: |
| /* TRAU frames only exist in 8K or 16K subslots. */ |
| OSMO_ASSERT(false); |
| break; |
| } |
| if (rc != 0) { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to decode trau frame\n"); |
| goto skip; |
| } |
| |
| /* Check if the payload type is supported and what the expected lenth |
| * of the RTP payload will be. */ |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: decoded trau frame type: %s\n", |
| osmo_trau_frame_type_name(fr.type)); |
| |
| /* Convert decoded trau frame to RTP frame */ |
| struct osmo_trau2rtp_state t2rs = { |
| .type = fr.type, |
| }; |
| rc = osmo_trau2rtp(msgb_data(msg) + rtp_hdr_len, msg->data_len - rtp_hdr_len, &fr, &t2rs); |
| if (rc <= 0) { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: unable to convert trau frame to RTP audio\n"); |
| goto skip; |
| } |
| msgb_put(msg, rtp_hdr_len + rc); |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-RX: encoded %u bytes of RTP audio: %s\n", rc, |
| osmo_hexdump(msgb_data(msg) + rtp_hdr_len, msgb_length(msg) - rtp_hdr_len)); |
| |
| /* Forward RTP data to IP */ |
| conn_dst = llist_first_entry(&endp->conns, struct mgcp_conn, entry); |
| if (!conn_dst) { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, |
| "E1-I.460-RX: unable to forward RTP audio data from E1: no connection to forward an incoming RTP packet to\n"); |
| goto skip; |
| } |
| OSMO_ASSERT(conn_dst->type == MGCP_CONN_TYPE_RTP); |
| |
| mgcp_send(endp, 1, NULL, msg, &conn_dst->u.rtp, &conn_dst->u.rtp); |
| |
| msgb_free(msg); |
| return; |
| skip: |
| rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_RX_FAIL_CTR)); |
| msgb_free(msg); |
| return; |
| } |
| |
| /* Function to handle outgoing E1 traffic */ |
| static void e1_send(struct e1inp_ts *ts, struct mgcp_trunk *trunk) |
| { |
| struct msgb *msg = msgb_alloc_c(trunk, E1_TS_BYTES, "E1-TX-timeslot-bytes"); |
| uint8_t *ptr; |
| |
| /* Get E1 frame from I.460 multiplexer */ |
| ptr = msgb_put(msg, E1_TS_BYTES); |
| osmo_i460_mux_out(&trunk->e1.i460_ts[ts->num - 1], ptr, E1_TS_BYTES); |
| |
| #if DEBUG_E1_TS == 1 |
| LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-TX: (ts:%u) sending %u bytes: %s...\n", ts->num, msgb_length(msg), |
| osmo_hexdump_nospc(msgb_data(msg), |
| msgb_length(msg) > DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg))); |
| #endif |
| /* Hand data over to the E1 stack */ |
| msgb_enqueue(&ts->raw.tx_queue, msg); |
| return; |
| } |
| |
| /* Callback function to handle incoming E1 traffic */ |
| static void e1_recv_cb(struct e1inp_ts *ts, struct msgb *msg) |
| { |
| struct mgcp_trunk *trunk; |
| |
| /* Find associated trunk */ |
| trunk = mgcp_trunk_by_line_num(cfg, ts->line->num); |
| if (!trunk) { |
| LOGP(DE1, LOGL_ERROR, "E1-RX: unable to find a trunk for E1-line %u!\n", ts->line->num); |
| msgb_free(msg); |
| return; |
| } |
| |
| /* Check if the incoming data looks sane */ |
| if (msgb_length(msg) != E1_TS_BYTES) { |
| LOGPTRUNK(trunk, DE1, LOGL_NOTICE, |
| "E1-RX: (ts:%u) expected length is %u, actual length is %u!\n", ts->num, E1_TS_BYTES, |
| msgb_length(msg)); |
| } |
| #if DEBUG_E1_TS == 1 |
| LOGPTRUNK(trunk, DE1, LOGL_DEBUG, "E1-RX: (ts:%u) receiving %u bytes: %s...\n", ts->num, |
| msgb_length(msg), osmo_hexdump_nospc(msgb_data(msg), |
| msgb_length(msg) > |
| DEBUG_BYTES_MAX ? DEBUG_BYTES_MAX : msgb_length(msg))); |
| #endif |
| |
| /* Hand data over to the I.460 demultiplexer. */ |
| osmo_i460_demux_in(&trunk->e1.i460_ts[ts->num - 1], msgb_data(msg), msgb_length(msg)); |
| |
| /* Trigger sending of pending E1 traffic */ |
| e1_send(ts, trunk); |
| |
| /* e1inp_rx_ts() does not free() msgb */ |
| msgb_free(msg); |
| } |
| |
| static int e1_init(struct mgcp_trunk *trunk, uint8_t ts_nr) |
| { |
| /*! Each timeslot needs only to be configured once. The Timeslot then |
| * stays open and permanently receives data. It is then up to the |
| * I.460 demultiplexer to add/remove subchannels as needed. It is |
| * allowed to call this function multiple times since we check if the |
| * timeslot is already configured. */ |
| |
| struct e1inp_line *e1_line; |
| int rc; |
| |
| OSMO_ASSERT(ts_nr > 0 || ts_nr < NUM_E1_TS); |
| cfg = trunk->cfg; |
| |
| if (trunk->e1.ts_in_use[ts_nr - 1]) { |
| LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u already set up, skipping...\n", ts_nr); |
| return 0; |
| } |
| |
| /* Get E1 line */ |
| e1_line = e1inp_line_find(trunk->e1.vty_line_nr); |
| if (!e1_line) { |
| LOGPTRUNK(trunk, DE1, LOGL_ERROR, "no such E1 line %u - check VTY config!\n", |
| trunk->e1.vty_line_nr); |
| return -EINVAL; |
| } |
| e1inp_line_bind_ops(e1_line, &dummy_e1_line_ops); |
| |
| /* Configure E1 timeslot */ |
| rc = e1inp_ts_config_raw(&e1_line->ts[ts_nr - 1], e1_line, e1_recv_cb); |
| if (rc < 0) { |
| LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to put E1 timeslot %u in raw mode.\n", ts_nr); |
| return -EINVAL; |
| } |
| rc = e1inp_line_update(e1_line); |
| if (rc < 0) { |
| LOGPTRUNK(trunk, DE1, LOGL_ERROR, "failed to update E1 timeslot %u.\n", ts_nr); |
| return -EINVAL; |
| } |
| |
| LOGPTRUNK(trunk, DE1, LOGL_INFO, "E1 timeslot %u set up successfully.\n", ts_nr); |
| trunk->e1.ts_in_use[ts_nr - 1] = true; |
| |
| return 0; |
| } |
| |
| /* Determine a suitable TRAU frame type for a given codec */ |
| static enum osmo_trau_frame_type determine_trau_fr_type(char *sdp_subtype_name, enum osmo_i460_rate i460_rate, |
| uint8_t amr_ft, struct mgcp_endpoint *endp) |
| { |
| if (strcmp(sdp_subtype_name, "GSM") == 0) |
| return OSMO_TRAU16_FT_FR; |
| else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0) |
| return OSMO_TRAU16_FT_EFR; |
| else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0) |
| return OSMO_TRAU16_FT_HR; |
| else if (strcmp(sdp_subtype_name, "AMR") == 0) { |
| if (i460_rate == OSMO_I460_RATE_8k) { |
| switch (amr_ft) { |
| case AMR_4_75: |
| case AMR_5_15: |
| case AMR_5_90: |
| return OSMO_TRAU8_AMR_LOW; |
| case AMR_6_70: |
| return OSMO_TRAU8_AMR_6k7; |
| case AMR_7_40: |
| return OSMO_TRAU8_AMR_7k4; |
| default: |
| LOGPENDP(endp, DE1, LOGL_ERROR, |
| "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft); |
| return OSMO_TRAU_FT_NONE; |
| } |
| } |
| return OSMO_TRAU16_FT_AMR; |
| } else { |
| LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n", |
| sdp_subtype_name); |
| return OSMO_TRAU_FT_NONE; |
| } |
| } |
| |
| /* Determine a suitable TRAU frame type for a given codec */ |
| static enum osmo_tray_sync_pat_id determine_trau_sync_pat(char *sdp_subtype_name, enum osmo_i460_rate i460_rate, |
| uint8_t amr_ft, struct mgcp_endpoint *endp) |
| { |
| if (strcmp(sdp_subtype_name, "GSM") == 0) |
| return OSMO_TRAU_SYNCP_16_FR_EFR; |
| else if (strcmp(sdp_subtype_name, "GSM-EFR") == 0) |
| return OSMO_TRAU_SYNCP_16_FR_EFR; |
| else if (strcmp(sdp_subtype_name, "GSM-HR-08") == 0) |
| return OSMO_TRAU_SYNCP_8_HR; |
| else if (strcmp(sdp_subtype_name, "AMR") == 0) { |
| if (i460_rate == OSMO_I460_RATE_8k) { |
| switch (amr_ft) { |
| case AMR_4_75: |
| case AMR_5_15: |
| case AMR_5_90: |
| return OSMO_TRAU_SYNCP_8_AMR_LOW; |
| case AMR_6_70: |
| return OSMO_TRAU_SYNCP_8_AMR_6K7; |
| case AMR_7_40: |
| return OSMO_TRAU_SYNCP_8_AMR_7K4; |
| default: |
| LOGPENDP(endp, DE1, LOGL_ERROR, |
| "E1-TRAU-TX: unsupported or illegal AMR frame type: %u\n", amr_ft); |
| return OSMO_TRAU_SYNCP_16_FR_EFR; |
| } |
| } |
| return OSMO_TRAU_SYNCP_16_FR_EFR; |
| } else { |
| LOGPENDP(endp, DE1, LOGL_ERROR, "E1-TRAU-TX: unsupported or illegal codec subtype name: %s\n", |
| sdp_subtype_name); |
| return OSMO_TRAU_SYNCP_16_FR_EFR; |
| } |
| } |
| |
| /* Find out if a given TRAU frame type is AMR */ |
| static bool tf_type_is_amr(enum osmo_trau_frame_type ft) |
| { |
| |
| switch (ft) { |
| case OSMO_TRAU16_FT_AMR: |
| case OSMO_TRAU8_AMR_LOW: |
| case OSMO_TRAU8_AMR_6k7: |
| case OSMO_TRAU8_AMR_7k4: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| /*! Equip E1 endpoint with I.460 mux resources. |
| * \param[in] endp endpoint to equip |
| * \param[in] ts E1 timeslot number. |
| * \param[in] ss E1 subslot number. |
| * \param[in] offset E1 bit offset. |
| * \returns 0 on success, -EINVAL on error. */ |
| int mgcp_e1_endp_equip(struct mgcp_endpoint *endp, uint8_t ts, uint8_t ss, uint8_t offs) |
| { |
| int rc; |
| enum osmo_tray_sync_pat_id sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR; |
| |
| OSMO_ASSERT(ts != 0); |
| OSMO_ASSERT(ts != 0xFF); |
| OSMO_ASSERT(ss != 0xFF); |
| OSMO_ASSERT(offs != 0xFF); |
| |
| memset(&endp->e1, 0, sizeof(endp->e1)); |
| |
| endp->e1.last_amr_ft = AMR_4_75; |
| |
| /* Set up E1 line / timeslot */ |
| rc = e1_init(endp->trunk, ts); |
| if (rc != 0) |
| return -EINVAL; |
| |
| /* Set up I.460 mux */ |
| switch (e1_rates[ss]) { |
| case 64: |
| endp->e1.scd.rate = OSMO_I460_RATE_64k; |
| endp->e1.scd.demux.num_bits = 160 * 8; |
| break; |
| case 32: |
| endp->e1.scd.rate = OSMO_I460_RATE_32k; |
| endp->e1.scd.demux.num_bits = 80 * 8; |
| break; |
| case 16: |
| endp->e1.scd.rate = OSMO_I460_RATE_16k; |
| endp->e1.scd.demux.num_bits = 40 * 8; |
| sync_pat_id = OSMO_TRAU_SYNCP_16_FR_EFR; |
| break; |
| case 8: |
| endp->e1.scd.rate = OSMO_I460_RATE_8k; |
| endp->e1.scd.demux.num_bits = 20 * 8; |
| sync_pat_id = OSMO_TRAU_SYNCP_8_HR; |
| break; |
| } |
| endp->e1.scd.bit_offset = offs; |
| endp->e1.scd.demux.out_cb_bits = e1_i460_demux_bits_cb; |
| endp->e1.scd.demux.out_cb_bytes = NULL; |
| endp->e1.scd.demux.user_data = endp; |
| endp->e1.scd.mux.in_cb_queue_empty = e1_i460_mux_empty_cb; |
| endp->e1.scd.mux.user_data = endp; |
| |
| LOGPENDP(endp, DE1, LOGL_INFO, "adding I.460 subchannel: ts=%u, bit_offset=%u, rate=%uk, num_bits=%lu\n", ts, |
| offs, e1_rates[ss], endp->e1.scd.demux.num_bits); |
| endp->e1.schan = osmo_i460_subchan_add(endp, &endp->trunk->e1.i460_ts[ts - 1], &endp->e1.scd); |
| if (!endp->e1.schan) { |
| LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 subchannel: failed!\n"); |
| return -EINVAL; |
| } |
| |
| if (endp->e1.scd.rate == OSMO_I460_RATE_16k || endp->e1.scd.rate == OSMO_I460_RATE_8k) { |
| /* TRAU frames are only specified for 16k and 8k subslots. For all other subslot |
| * types the concept of TRAU frames does not apply. However, at the moment this |
| * is the only format we currently support in osmo-mgw */ |
| endp->e1.trau_sync_fi = osmo_trau_sync_alloc(endp, "trau-sync", sync_frame_out_cb, sync_pat_id, endp); |
| if (!endp->e1.trau_sync_fi) { |
| LOGPENDP(endp, DE1, LOGL_ERROR, "adding I.460 TRAU frame sync: failed!\n"); |
| return -EINVAL; |
| } |
| endp->e1.trau_rtp_st = talloc_zero(endp->e1.trau_sync_fi, struct osmo_trau2rtp_state); |
| endp->e1.trau_rtp_st->type = OSMO_TRAU_FT_NONE; |
| } else { |
| LOGPENDP(endp, DE1, LOGL_ERROR, |
| "osmo-mgw currently only supports 16K and 8K subslots (TRAU frames)!\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /*! Update E1 related parameters (codec and sync pattern). |
| * \param[in] endp endpoint to update. */ |
| void mgcp_e1_endp_update(struct mgcp_endpoint *endp) |
| { |
| struct mgcp_conn *conn; |
| struct mgcp_rtp_codec *codec; |
| enum osmo_tray_sync_pat_id sync_pat_id; |
| |
| /* In order to determine the codec, find the oldest connection on |
| * the endpoint and use its codec information. Normally on an E1 |
| * endpoint no more than one connection should exist. */ |
| conn = mgcp_conn_get_oldest(endp); |
| OSMO_ASSERT(conn); |
| codec = conn->u.rtp.end.codec; |
| OSMO_ASSERT(codec); |
| |
| /* Update codec information */ |
| endp->e1.trau_rtp_st->type = |
| determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp); |
| endp->e1.last_codec = codec; |
| |
| /* Update sync pattern */ |
| sync_pat_id = determine_trau_sync_pat(codec->subtype_name, endp->e1.scd.rate, endp->e1.last_amr_ft, endp); |
| osmo_trau_sync_set_pat(endp->e1.trau_sync_fi, sync_pat_id); |
| } |
| |
| /*! Remove E1 resources from endpoint |
| * \param[in] endp endpoint to release. */ |
| void mgcp_e1_endp_release(struct mgcp_endpoint *endp) |
| { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "removing I.460 subchannel and sync...\n"); |
| |
| if (endp->e1.schan) |
| osmo_i460_subchan_del(endp->e1.schan); |
| if (endp->e1.trau_rtp_st) |
| talloc_free(endp->e1.trau_rtp_st); |
| if (endp->e1.trau_sync_fi) |
| osmo_fsm_inst_term(endp->e1.trau_sync_fi, OSMO_FSM_TERM_REGULAR, NULL); |
| |
| memset(&endp->e1, 0, sizeof(endp->e1)); |
| } |
| |
| /*! Accept RTP message buffer with RTP data and enqueue voice data for E1 transmit. |
| * \param[in] endp related endpoint (does not take ownership). |
| * \param[in] codec configuration. |
| * \param[in] msg RTP message buffer (including RTP header). |
| * \returns 0 on success, -1 on ERROR. */ |
| int mgcp_e1_send_rtp(struct mgcp_endpoint *endp, struct mgcp_rtp_codec *codec, struct msgb *msg) |
| { |
| struct msgb *msg_tf = msgb_alloc_c(endp->trunk, E1_TRAU_BITS_MSGB, "E1-I.460-TX-TRAU-frame"); |
| struct rate_ctr_group *rate_ctrs = endp->trunk->ratectr.e1_stats; |
| unsigned int rtp_hdr_len = sizeof(struct rtp_hdr); |
| struct osmo_trau_frame tf; |
| uint8_t amr_ft; |
| int rc; |
| |
| /* Extract AMR frame type from AMR head (if AMR is used) */ |
| if (tf_type_is_amr(endp->e1.trau_rtp_st->type)) |
| amr_ft = (msgb_data(msg)[rtp_hdr_len + 1] >> 3) & 0xf; |
| else |
| amr_ft = 0xff; |
| |
| /* Adapt TRAU frame type on codec changes */ |
| OSMO_ASSERT(endp->e1.last_codec); |
| if (codec != endp->e1.last_codec || (amr_ft != 0xff && amr_ft != endp->e1.last_amr_ft)) { |
| endp->e1.trau_rtp_st->type = |
| determine_trau_fr_type(codec->subtype_name, endp->e1.scd.rate, amr_ft, endp); |
| endp->e1.last_codec = codec; |
| endp->e1.last_amr_ft = amr_ft; |
| } |
| if (endp->e1.trau_rtp_st->type == OSMO_TRAU_FT_NONE) |
| goto skip; |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: using trau frame type for encoding: %s\n", |
| osmo_trau_frame_type_name(endp->e1.trau_rtp_st->type)); |
| |
| /* Convert from RTP to TRAU format */ |
| msg->l2h = msgb_data(msg) + rtp_hdr_len; |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: decoding %u bytes of RTP audio to TRAU format: %s\n", |
| msgb_length(msg), osmo_hexdump(msgb_l2(msg), msgb_l2len(msg))); |
| memset(&tf, 0, sizeof(tf)); |
| tf.dir = OSMO_TRAU_DIR_DL; |
| rc = osmo_rtp2trau(&tf, msgb_l2(msg), msgb_l2len(msg), endp->e1.trau_rtp_st); |
| if (rc < 0) { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, |
| "E1-I.460-TX: failed to decode from RTP payload format to TRAU format\n"); |
| goto skip; |
| } |
| rc = osmo_trau_frame_encode(msgb_data(msg_tf), msg_tf->data_len, &tf); |
| if (rc < 0) { |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: failed to encode TRAU frame\n"); |
| goto skip; |
| } |
| msgb_put(msg_tf, rc); |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: enquing %u trau frame bits: %s...\n", msgb_length(msg_tf), |
| osmo_ubit_dump(msgb_data(msg_tf), |
| msgb_length(msg_tf) > DEBUG_BITS_MAX ? DEBUG_BITS_MAX : msgb_length(msg_tf))); |
| |
| /* Enqueue data to I.460 multiplexer */ |
| OSMO_ASSERT(endp->e1.schan); |
| OSMO_ASSERT(endp->e1.trau_sync_fi); |
| |
| osmo_i460_mux_enqueue(endp->e1.schan, msg_tf); |
| LOGPENDP(endp, DE1, LOGL_DEBUG, "E1-I.460-TX: %u bits of audio enqued for E1 tx\n", msgb_length(msg_tf)); |
| |
| return 0; |
| skip: |
| rate_ctr_inc(rate_ctr_group_get_ctr(rate_ctrs, E1_I460_TRAU_TX_FAIL_CTR)); |
| msgb_free(msg_tf); |
| return -1; |
| } |