Harald Welte | 04fe6b5 | 2020-06-20 21:05:31 +0200 | [diff] [blame] | 1 | #include <sys/types.h> |
| 2 | #include <sys/stat.h> |
| 3 | #include <sys/ioctl.h> |
| 4 | #include <fcntl.h> |
| 5 | #include <unistd.h> |
| 6 | #include <errno.h> |
| 7 | |
| 8 | #include <dahdi/user.h> |
| 9 | |
| 10 | #include <osmocom/core/utils.h> |
| 11 | #include <osmocom/core/application.h> |
| 12 | #include <osmocom/gsm/i460_mux.h> |
| 13 | #include <osmocom/trau/trau_sync.h> |
| 14 | #include <osmocom/trau/trau_frame.h> |
| 15 | #include <osmocom/trau/trau_rtp.h> |
| 16 | #include <osmocom/trau/osmo_ortp.h> |
| 17 | |
| 18 | #define D_BCHAN_TX_GRAN 160 |
| 19 | |
| 20 | /*********************************************************************** |
| 21 | * BEGIN CONFIGURATION |
| 22 | ***********************************************************************/ |
| 23 | /* HACK: Those do not have getopt but need to be modified in source code to match your enviroment */ |
| 24 | |
| 25 | /* do we just locally loop the calls from 1->2, or do we interface with RTP? */ |
| 26 | static bool g_local_loop = false; |
| 27 | |
| 28 | /* remote IP address to which we send RTP data (unless g_local_loop mode) */ |
| 29 | const char *g_remote_host = "192.168.101.131"; |
| 30 | |
| 31 | /* remote UDP base port to which we send RTP data: +2 for every sub-slot */ |
| 32 | const int g_remote_port = 9000; |
| 33 | |
| 34 | /* local UDP base port on which we receive RTP data: +2 for every sub-slot */ |
| 35 | const int g_local_port = 8000; |
| 36 | |
| 37 | /* codec; can be OSMO_TRAU16_FT_FR or OSMO_TRAU16_FT_EFR */ |
| 38 | const enum osmo_trau_frame_type g_ftype = OSMO_TRAU16_FT_EFR; |
| 39 | |
| 40 | /*********************************************************************** |
| 41 | * END CONFIGURATION |
| 42 | ***********************************************************************/ |
| 43 | |
| 44 | /* do we have a DAHDI chardev to which we can write RTP->TRAU conversion data/ */ |
| 45 | static bool g_ts_is_writable = false; |
| 46 | |
| 47 | struct sc_state { |
| 48 | unsigned int num; |
| 49 | struct osmo_i460_subchan *i460_sc; |
| 50 | struct osmo_fsm_inst *sync_fi; |
| 51 | struct osmo_rtp_socket *rtps; |
| 52 | struct osmo_trau2rtp_state t2r; |
| 53 | }; |
| 54 | |
| 55 | struct state { |
| 56 | int in_fd; |
| 57 | struct osmo_i460_timeslot i460_ts; |
| 58 | struct sc_state sc[4]; |
| 59 | }; |
| 60 | static struct state g_st; |
| 61 | |
| 62 | #define LOGSC(sc, fmt, args...) printf("SC%u: " fmt, (sc)->num, ## args) |
| 63 | |
| 64 | static struct sc_state *opposite_schan(struct sc_state *sc) |
| 65 | { |
| 66 | /* we blindly assume that there is a call between sub-channel 1 + sub-channel 2 */ |
| 67 | switch (sc->num) { |
| 68 | case 1: |
| 69 | return &g_st.sc[2]; |
| 70 | case 2: |
| 71 | return &g_st.sc[1]; |
| 72 | default: |
| 73 | OSMO_ASSERT(0); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | /* called by I.460 de-multeiplexer; feed output of I.460 demux into TRAU frame sync */ |
| 78 | static void i460_demux_bits_cb(struct osmo_i460_subchan *schan, void *user_data, |
| 79 | const ubit_t *bits, unsigned int num_bits) |
| 80 | { |
| 81 | struct sc_state *sc = user_data; |
| 82 | //printf("I460: %s\n", osmo_ubit_dump(bits, num_bits)); |
| 83 | osmo_trau_sync_rx_ubits(sc->sync_fi, bits, num_bits); |
| 84 | } |
| 85 | |
| 86 | /* called for each synchronized TRAU frame received; decode frame + convert to RTP */ |
| 87 | static void sync_frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits) |
| 88 | { |
| 89 | struct sc_state *sc = user_data; |
| 90 | struct osmo_trau_frame fr; |
| 91 | int rc; |
| 92 | |
| 93 | LOGSC(sc, "Rx TRAU: %s\n", osmo_ubit_dump(bits, num_bits)); |
| 94 | if (!bits) |
| 95 | goto skip; |
| 96 | |
| 97 | rc = osmo_trau_frame_decode_16k(&fr, bits, OSMO_TRAU_DIR_UL); |
| 98 | if (rc != 0) |
| 99 | goto skip; |
| 100 | |
| 101 | uint8_t sid; |
| 102 | switch (fr.type) { |
| 103 | case OSMO_TRAU16_FT_FR: |
| 104 | case OSMO_TRAU16_FT_EFR: |
| 105 | sid = (fr.c_bits[13-1]) << 1 | (fr.c_bits[14-1] << 0); |
| 106 | LOGSC(sc, "-> FT=%s, BFI=%u, SID=%u, TAF=%u DTXd=%u\n", |
| 107 | osmo_trau_frame_type_name(fr.type), fr.c_bits[12-1], sid, fr.c_bits[15-1], fr.c_bits[17-1]); |
| 108 | break; |
| 109 | default: |
| 110 | LOGSC(sc, "-> FT=%s\n", osmo_trau_frame_type_name(fr.type)); |
| 111 | break; |
| 112 | } |
| 113 | |
| 114 | if (g_local_loop) { |
| 115 | /* Mirror back to other sub-slot */ |
| 116 | struct sc_state *peer = opposite_schan(sc); |
| 117 | if (peer) { |
| 118 | struct msgb *msg = msgb_alloc(2*40*8, "mirror"); |
| 119 | fr.c_bits[12-1] = 1; /* C12 = good u-link frame */ |
| 120 | memset(&fr.c_bits[13-1], 1, 3); /* C13..C15: spare */ |
| 121 | fr.c_bits[16-1] = 1; /* C16 = SP[eech]; no DTX */ |
| 122 | memset(&fr.c_bits[6-1], 0, 6); /* C6..C11: tie alignment */ |
| 123 | fr.dir = OSMO_TRAU_DIR_DL; |
| 124 | rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &fr); |
| 125 | OSMO_ASSERT(rc >= 0); |
| 126 | msgb_put(msg, rc); |
| 127 | osmo_i460_mux_enqueue(peer->i460_sc, msg); |
| 128 | } |
| 129 | } else { |
| 130 | /* Convert to RTP */ |
| 131 | if (fr.type != OSMO_TRAU16_FT_FR && fr.type != OSMO_TRAU16_FT_EFR) |
| 132 | goto skip; |
| 133 | |
| 134 | uint8_t rtpbuf[35]; |
| 135 | struct osmo_trau2rtp_state t2rs = { |
| 136 | .type = fr.type, |
| 137 | }; |
| 138 | memset(rtpbuf, 0, sizeof(rtpbuf)); |
| 139 | rc = osmo_trau2rtp(rtpbuf, sizeof(rtpbuf), &fr, &t2rs); |
| 140 | LOGSC(sc, "Tx RTP: %s\n", osmo_hexdump(rtpbuf, rc)); |
| 141 | if (rc) |
| 142 | osmo_rtp_send_frame_ext(sc->rtps, rtpbuf, rc, 160, false); |
| 143 | else { |
| 144 | osmo_rtp_skipped_frame(sc->rtps, 160); |
| 145 | } |
| 146 | return; |
| 147 | } |
| 148 | skip: |
| 149 | if (!g_local_loop) |
| 150 | osmo_rtp_skipped_frame(sc->rtps, 160); |
| 151 | } |
| 152 | |
| 153 | static int dahdi_set_bufinfo(int fd, int as_sigchan) |
| 154 | { |
| 155 | struct dahdi_bufferinfo bi; |
| 156 | int x = 0; |
| 157 | |
| 158 | if (ioctl(fd, DAHDI_GET_BUFINFO, &bi)) { |
| 159 | LOGP(DLINP, LOGL_ERROR, "Error getting bufinfo\n"); |
| 160 | return -EIO; |
| 161 | } |
| 162 | |
| 163 | if (as_sigchan) { |
| 164 | bi.numbufs = 4; |
| 165 | bi.bufsize = 512; |
| 166 | } else { |
| 167 | bi.numbufs = 8; |
| 168 | bi.bufsize = D_BCHAN_TX_GRAN; |
| 169 | bi.txbufpolicy = DAHDI_POLICY_WHEN_FULL; |
| 170 | } |
| 171 | |
| 172 | if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) { |
| 173 | fprintf(stderr, "Error setting DAHDI bufinfo\n"); |
| 174 | return -EIO; |
| 175 | } |
| 176 | |
| 177 | if (!as_sigchan) { |
| 178 | if (ioctl(fd, DAHDI_AUDIOMODE, &x)) { |
| 179 | fprintf(stderr, "Error setting DAHDI bufinfo\n"); |
| 180 | return -EIO; |
| 181 | } |
| 182 | } else { |
| 183 | int one = 1; |
| 184 | ioctl(fd, DAHDI_HDLCFCSMODE, &one); |
| 185 | /* we cannot reliably check for the ioctl return value here |
| 186 | * as this command will fail if the slot _already_ was a |
| 187 | * signalling slot before :( */ |
| 188 | } |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static void mux_q_empty_cb(struct osmo_i460_subchan *schan, void *user_data); |
| 193 | |
| 194 | /* RTP data was received on the socket */ |
| 195 | static void ortp_rx_cb(struct osmo_rtp_socket *rs, const uint8_t *payload, |
| 196 | unsigned int payload_len, uint16_t seq_number, uint32_t timestamp, bool marker) |
| 197 | { |
| 198 | struct sc_state *sc = rs->priv; |
| 199 | struct osmo_trau_frame fr; |
| 200 | int rc; |
| 201 | |
| 202 | LOGSC(sc, "RTP Rx: %s\n", osmo_hexdump_nospc(payload, payload_len)); |
| 203 | |
| 204 | sc->t2r.type = g_ftype; |
| 205 | |
| 206 | memset(&fr, 0, sizeof(fr)); |
| 207 | fr.dir = OSMO_TRAU_DIR_DL; |
| 208 | rc = osmo_rtp2trau(&fr, payload, payload_len, &sc->t2r); |
| 209 | if (rc < 0) { |
| 210 | LOGSC(sc, "Failed to convert RTP to TRAU"); |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | struct msgb *msg = msgb_alloc(2*40*8, "rtp2trau"); |
| 215 | rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &fr); |
| 216 | OSMO_ASSERT(rc >= 0); |
| 217 | msgb_put(msg, rc); |
| 218 | osmo_i460_mux_enqueue(sc->i460_sc, msg); |
| 219 | } |
| 220 | |
| 221 | static void init(const char *fname) |
| 222 | { |
| 223 | struct stat st; |
| 224 | int rc; |
| 225 | |
| 226 | struct osmo_i460_schan_desc scd16_0 = { |
| 227 | .rate = OSMO_I460_RATE_16k, |
| 228 | .demux = { |
| 229 | .num_bits = 40*8, |
| 230 | .out_cb_bytes = NULL, |
| 231 | }, |
| 232 | }; |
| 233 | |
| 234 | rc = stat(fname, &st); |
| 235 | OSMO_ASSERT(rc == 0); |
| 236 | if (S_ISCHR(st.st_mode)) { |
| 237 | /* if this is a char device, we assume DAHDI */ |
| 238 | g_ts_is_writable = true; |
| 239 | g_st.in_fd = open(fname, O_RDWR); |
| 240 | OSMO_ASSERT(g_st.in_fd >= 0); |
| 241 | dahdi_set_bufinfo(g_st.in_fd, false); |
| 242 | } else { |
| 243 | g_st.in_fd = open(fname, O_RDONLY); |
| 244 | OSMO_ASSERT(g_st.in_fd >= 0); |
| 245 | } |
| 246 | |
| 247 | osmo_i460_ts_init(&g_st.i460_ts); |
| 248 | |
| 249 | //for (i = 0; i < ARRAY_SIZE(g_st.sc); i++) { |
| 250 | for (int i = 1; i < 3; i++) { |
| 251 | struct sc_state *sc = &g_st.sc[i]; |
| 252 | sc->num = i; |
| 253 | |
| 254 | scd16_0.bit_offset = i * 2; |
| 255 | scd16_0.demux.user_data = sc; |
| 256 | scd16_0.demux.out_cb_bits = i460_demux_bits_cb, |
| 257 | scd16_0.mux.in_cb_queue_empty = mux_q_empty_cb; |
| 258 | scd16_0.mux.user_data = sc; |
| 259 | sc->i460_sc = osmo_i460_subchan_add(NULL, &g_st.i460_ts, &scd16_0); |
| 260 | OSMO_ASSERT(sc->i460_sc != NULL); |
| 261 | |
| 262 | char strbuf[16]; |
| 263 | snprintf(strbuf, sizeof(strbuf), "SC%u", sc->num); |
| 264 | sc->sync_fi = osmo_trau_sync_alloc(NULL, strbuf, sync_frame_out_cb, OSMO_TRAU_SYNCP_16_FR_EFR, sc); |
| 265 | OSMO_ASSERT(sc->sync_fi); |
| 266 | sc->rtps = osmo_rtp_socket_create(NULL, OSMO_RTP_F_POLL); |
| 267 | OSMO_ASSERT(sc->rtps); |
| 268 | osmo_rtp_socket_set_pt(sc->rtps, RTP_PT_GSM_FULL); |
| 269 | sc->rtps->rx_cb = ortp_rx_cb; |
| 270 | sc->rtps->priv = sc; |
| 271 | osmo_rtp_socket_bind(sc->rtps, "0.0.0.0", g_local_port + i*2); |
| 272 | osmo_rtp_socket_connect(sc->rtps, g_remote_host, g_remote_port + i*2); |
| 273 | //osmo_rtp_socket_autoconnect(sc->rtps); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static void mux_q_empty_cb(struct osmo_i460_subchan *schan, void *user_data) |
| 278 | { |
| 279 | struct sc_state *sc = user_data; |
| 280 | struct msgb *msg = msgb_alloc(2*40*8, "mux-enq"); |
| 281 | struct osmo_trau_frame traufr = { |
| 282 | .type = g_ftype, |
| 283 | .dir = OSMO_TRAU_DIR_DL, |
| 284 | }; |
| 285 | int rc; |
| 286 | |
| 287 | LOGSC(sc, "EMPTY -> Generating Tx\n"); |
| 288 | |
| 289 | if (traufr.type == OSMO_TRAU16_FT_EFR) { |
| 290 | traufr.c_bits[12-1] = 1; /* C12 = good u-link frame */ |
| 291 | traufr.c_bits[16-1] = 1; /* C16 = SP[eech]; no DTX */ |
| 292 | } |
| 293 | |
| 294 | rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &traufr); |
| 295 | OSMO_ASSERT(rc >= 0); |
| 296 | msgb_put(msg, rc); |
| 297 | //LOGSC(sc, "Tx TRAU: %s\n", osmo_ubit_dump(cur, 40*8)); |
| 298 | osmo_i460_mux_enqueue(sc->i460_sc, msg); |
| 299 | } |
| 300 | |
| 301 | static void process(void) |
| 302 | { |
| 303 | uint8_t buf[D_BCHAN_TX_GRAN]; |
| 304 | int rc, nread; |
| 305 | |
| 306 | while (rc = read(g_st.in_fd, buf, sizeof(buf))) { |
| 307 | OSMO_ASSERT(rc == sizeof(buf)); |
| 308 | nread = rc; |
| 309 | osmo_i460_demux_in(&g_st.i460_ts, buf, nread); |
| 310 | |
| 311 | for (int i = 1; i < 3; i++) { |
| 312 | struct sc_state *sc = &g_st.sc[i]; |
| 313 | int rc2 = osmo_rtp_socket_poll(sc->rtps); |
| 314 | sc->rtps->rx_user_ts += 160; |
| 315 | //printf("rtp_recv=%d (flags=%x)\n",rc2, sc->rtps->flags); |
| 316 | } |
| 317 | |
| 318 | /* write as many bytes as we just received */ |
| 319 | osmo_i460_mux_out(&g_st.i460_ts, buf, nread); |
| 320 | if (g_ts_is_writable) { |
| 321 | rc = write(g_st.in_fd, buf, nread); |
| 322 | if (rc != nread) |
| 323 | printf("rc=%d, nread=%d (%s)\n", rc, nread, strerror(errno)); |
| 324 | OSMO_ASSERT(rc == nread); |
| 325 | } |
| 326 | //usleep(20000); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | int main(int argc, char **argv) |
| 331 | { |
| 332 | osmo_init_logging2(NULL, NULL); |
| 333 | osmo_fsm_log_addr(false); |
| 334 | log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_BASENAME); |
| 335 | log_set_category_filter(osmo_stderr_target, DLMIB, true, LOGL_DEBUG); |
| 336 | osmo_rtp_init(NULL); |
| 337 | |
| 338 | init(argv[1]); |
| 339 | process(); |
| 340 | } |