| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <errno.h> |
| |
| #include <dahdi/user.h> |
| |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/application.h> |
| #include <osmocom/gsm/i460_mux.h> |
| #include <osmocom/trau/trau_sync.h> |
| #include <osmocom/trau/trau_frame.h> |
| #include <osmocom/trau/trau_rtp.h> |
| #include <osmocom/trau/osmo_ortp.h> |
| |
| #define D_BCHAN_TX_GRAN 160 |
| |
| /*********************************************************************** |
| * BEGIN CONFIGURATION |
| ***********************************************************************/ |
| /* HACK: Those do not have getopt but need to be modified in source code to match your enviroment */ |
| |
| /* do we just locally loop the calls from 1->2, or do we interface with RTP? */ |
| static bool g_local_loop = false; |
| |
| /* remote IP address to which we send RTP data (unless g_local_loop mode) */ |
| const char *g_remote_host = "192.168.101.131"; |
| |
| /* remote UDP base port to which we send RTP data: +2 for every sub-slot */ |
| const int g_remote_port = 9000; |
| |
| /* local UDP base port on which we receive RTP data: +2 for every sub-slot */ |
| const int g_local_port = 8000; |
| |
| /* codec; can be OSMO_TRAU16_FT_FR or OSMO_TRAU16_FT_EFR */ |
| const enum osmo_trau_frame_type g_ftype = OSMO_TRAU16_FT_EFR; |
| |
| /*********************************************************************** |
| * END CONFIGURATION |
| ***********************************************************************/ |
| |
| /* do we have a DAHDI chardev to which we can write RTP->TRAU conversion data/ */ |
| static bool g_ts_is_writable = false; |
| |
| struct sc_state { |
| unsigned int num; |
| struct osmo_i460_subchan *i460_sc; |
| struct osmo_fsm_inst *sync_fi; |
| struct osmo_rtp_socket *rtps; |
| struct osmo_trau2rtp_state t2r; |
| }; |
| |
| struct state { |
| int in_fd; |
| struct osmo_i460_timeslot i460_ts; |
| struct sc_state sc[4]; |
| }; |
| static struct state g_st; |
| |
| #define LOGSC(sc, fmt, args...) printf("SC%u: " fmt, (sc)->num, ## args) |
| |
| static struct sc_state *opposite_schan(struct sc_state *sc) |
| { |
| /* we blindly assume that there is a call between sub-channel 1 + sub-channel 2 */ |
| switch (sc->num) { |
| case 1: |
| return &g_st.sc[2]; |
| case 2: |
| return &g_st.sc[1]; |
| default: |
| OSMO_ASSERT(0); |
| } |
| } |
| |
| /* called by I.460 de-multeiplexer; feed output of I.460 demux into TRAU frame sync */ |
| static void i460_demux_bits_cb(struct osmo_i460_subchan *schan, void *user_data, |
| const ubit_t *bits, unsigned int num_bits) |
| { |
| struct sc_state *sc = user_data; |
| //printf("I460: %s\n", osmo_ubit_dump(bits, num_bits)); |
| osmo_trau_sync_rx_ubits(sc->sync_fi, bits, num_bits); |
| } |
| |
| /* called for each synchronized TRAU frame received; decode frame + convert to RTP */ |
| static void sync_frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits) |
| { |
| struct sc_state *sc = user_data; |
| struct osmo_trau_frame fr; |
| int rc; |
| |
| LOGSC(sc, "Rx TRAU: %s\n", osmo_ubit_dump(bits, num_bits)); |
| if (!bits) |
| goto skip; |
| |
| rc = osmo_trau_frame_decode_16k(&fr, bits, OSMO_TRAU_DIR_UL); |
| if (rc != 0) |
| goto skip; |
| |
| uint8_t sid; |
| switch (fr.type) { |
| case OSMO_TRAU16_FT_FR: |
| case OSMO_TRAU16_FT_EFR: |
| sid = (fr.c_bits[13-1]) << 1 | (fr.c_bits[14-1] << 0); |
| LOGSC(sc, "-> FT=%s, BFI=%u, SID=%u, TAF=%u DTXd=%u\n", |
| osmo_trau_frame_type_name(fr.type), fr.c_bits[12-1], sid, fr.c_bits[15-1], fr.c_bits[17-1]); |
| break; |
| default: |
| LOGSC(sc, "-> FT=%s\n", osmo_trau_frame_type_name(fr.type)); |
| break; |
| } |
| |
| if (g_local_loop) { |
| /* Mirror back to other sub-slot */ |
| struct sc_state *peer = opposite_schan(sc); |
| if (peer) { |
| struct msgb *msg = msgb_alloc(2*40*8, "mirror"); |
| fr.c_bits[12-1] = 1; /* C12 = good u-link frame */ |
| memset(&fr.c_bits[13-1], 1, 3); /* C13..C15: spare */ |
| fr.c_bits[16-1] = 1; /* C16 = SP[eech]; no DTX */ |
| memset(&fr.c_bits[6-1], 0, 6); /* C6..C11: tie alignment */ |
| fr.dir = OSMO_TRAU_DIR_DL; |
| rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &fr); |
| OSMO_ASSERT(rc >= 0); |
| msgb_put(msg, rc); |
| osmo_i460_mux_enqueue(peer->i460_sc, msg); |
| } |
| } else { |
| /* Convert to RTP */ |
| if (fr.type != OSMO_TRAU16_FT_FR && fr.type != OSMO_TRAU16_FT_EFR) |
| goto skip; |
| |
| uint8_t rtpbuf[35]; |
| struct osmo_trau2rtp_state t2rs = { |
| .type = fr.type, |
| }; |
| memset(rtpbuf, 0, sizeof(rtpbuf)); |
| rc = osmo_trau2rtp(rtpbuf, sizeof(rtpbuf), &fr, &t2rs); |
| LOGSC(sc, "Tx RTP: %s\n", osmo_hexdump(rtpbuf, rc)); |
| if (rc) |
| osmo_rtp_send_frame_ext(sc->rtps, rtpbuf, rc, 160, false); |
| else { |
| osmo_rtp_skipped_frame(sc->rtps, 160); |
| } |
| return; |
| } |
| skip: |
| if (!g_local_loop) |
| osmo_rtp_skipped_frame(sc->rtps, 160); |
| } |
| |
| static int dahdi_set_bufinfo(int fd, int as_sigchan) |
| { |
| struct dahdi_bufferinfo bi; |
| int x = 0; |
| |
| if (ioctl(fd, DAHDI_GET_BUFINFO, &bi)) { |
| LOGP(DLINP, LOGL_ERROR, "Error getting bufinfo\n"); |
| return -EIO; |
| } |
| |
| if (as_sigchan) { |
| bi.numbufs = 4; |
| bi.bufsize = 512; |
| } else { |
| bi.numbufs = 8; |
| bi.bufsize = D_BCHAN_TX_GRAN; |
| bi.txbufpolicy = DAHDI_POLICY_WHEN_FULL; |
| } |
| |
| if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) { |
| fprintf(stderr, "Error setting DAHDI bufinfo\n"); |
| return -EIO; |
| } |
| |
| if (!as_sigchan) { |
| if (ioctl(fd, DAHDI_AUDIOMODE, &x)) { |
| fprintf(stderr, "Error setting DAHDI bufinfo\n"); |
| return -EIO; |
| } |
| } else { |
| int one = 1; |
| ioctl(fd, DAHDI_HDLCFCSMODE, &one); |
| /* we cannot reliably check for the ioctl return value here |
| * as this command will fail if the slot _already_ was a |
| * signalling slot before :( */ |
| } |
| return 0; |
| } |
| |
| static void mux_q_empty_cb(struct osmo_i460_subchan *schan, void *user_data); |
| |
| /* RTP data was received on the socket */ |
| static void ortp_rx_cb(struct osmo_rtp_socket *rs, const uint8_t *payload, |
| unsigned int payload_len, uint16_t seq_number, uint32_t timestamp, bool marker) |
| { |
| struct sc_state *sc = rs->priv; |
| struct osmo_trau_frame fr; |
| int rc; |
| |
| LOGSC(sc, "RTP Rx: %s\n", osmo_hexdump_nospc(payload, payload_len)); |
| |
| sc->t2r.type = g_ftype; |
| |
| memset(&fr, 0, sizeof(fr)); |
| fr.dir = OSMO_TRAU_DIR_DL; |
| rc = osmo_rtp2trau(&fr, payload, payload_len, &sc->t2r); |
| if (rc < 0) { |
| LOGSC(sc, "Failed to convert RTP to TRAU"); |
| return; |
| } |
| |
| struct msgb *msg = msgb_alloc(2*40*8, "rtp2trau"); |
| rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &fr); |
| OSMO_ASSERT(rc >= 0); |
| msgb_put(msg, rc); |
| osmo_i460_mux_enqueue(sc->i460_sc, msg); |
| } |
| |
| static void init(const char *fname) |
| { |
| struct stat st; |
| int rc; |
| |
| struct osmo_i460_schan_desc scd16_0 = { |
| .rate = OSMO_I460_RATE_16k, |
| .demux = { |
| .num_bits = 40*8, |
| .out_cb_bytes = NULL, |
| }, |
| }; |
| |
| rc = stat(fname, &st); |
| OSMO_ASSERT(rc == 0); |
| if (S_ISCHR(st.st_mode)) { |
| /* if this is a char device, we assume DAHDI */ |
| g_ts_is_writable = true; |
| g_st.in_fd = open(fname, O_RDWR); |
| OSMO_ASSERT(g_st.in_fd >= 0); |
| dahdi_set_bufinfo(g_st.in_fd, false); |
| } else { |
| g_st.in_fd = open(fname, O_RDONLY); |
| OSMO_ASSERT(g_st.in_fd >= 0); |
| } |
| |
| osmo_i460_ts_init(&g_st.i460_ts); |
| |
| //for (i = 0; i < ARRAY_SIZE(g_st.sc); i++) { |
| for (int i = 1; i < 3; i++) { |
| struct sc_state *sc = &g_st.sc[i]; |
| sc->num = i; |
| |
| scd16_0.bit_offset = i * 2; |
| scd16_0.demux.user_data = sc; |
| scd16_0.demux.out_cb_bits = i460_demux_bits_cb, |
| scd16_0.mux.in_cb_queue_empty = mux_q_empty_cb; |
| scd16_0.mux.user_data = sc; |
| sc->i460_sc = osmo_i460_subchan_add(NULL, &g_st.i460_ts, &scd16_0); |
| OSMO_ASSERT(sc->i460_sc != NULL); |
| |
| char strbuf[16]; |
| snprintf(strbuf, sizeof(strbuf), "SC%u", sc->num); |
| sc->sync_fi = osmo_trau_sync_alloc(NULL, strbuf, sync_frame_out_cb, OSMO_TRAU_SYNCP_16_FR_EFR, sc); |
| OSMO_ASSERT(sc->sync_fi); |
| sc->rtps = osmo_rtp_socket_create(NULL, OSMO_RTP_F_POLL); |
| OSMO_ASSERT(sc->rtps); |
| osmo_rtp_socket_set_pt(sc->rtps, RTP_PT_GSM_FULL); |
| sc->rtps->rx_cb = ortp_rx_cb; |
| sc->rtps->priv = sc; |
| osmo_rtp_socket_bind(sc->rtps, "0.0.0.0", g_local_port + i*2); |
| osmo_rtp_socket_connect(sc->rtps, g_remote_host, g_remote_port + i*2); |
| //osmo_rtp_socket_autoconnect(sc->rtps); |
| } |
| } |
| |
| static void mux_q_empty_cb(struct osmo_i460_subchan *schan, void *user_data) |
| { |
| struct sc_state *sc = user_data; |
| struct msgb *msg = msgb_alloc(2*40*8, "mux-enq"); |
| struct osmo_trau_frame traufr = { |
| .type = g_ftype, |
| .dir = OSMO_TRAU_DIR_DL, |
| }; |
| int rc; |
| |
| LOGSC(sc, "EMPTY -> Generating Tx\n"); |
| |
| if (traufr.type == OSMO_TRAU16_FT_EFR) { |
| traufr.c_bits[12-1] = 1; /* C12 = good u-link frame */ |
| traufr.c_bits[16-1] = 1; /* C16 = SP[eech]; no DTX */ |
| } |
| |
| rc = osmo_trau_frame_encode(msgb_data(msg), 2*40*8, &traufr); |
| OSMO_ASSERT(rc >= 0); |
| msgb_put(msg, rc); |
| //LOGSC(sc, "Tx TRAU: %s\n", osmo_ubit_dump(cur, 40*8)); |
| osmo_i460_mux_enqueue(sc->i460_sc, msg); |
| } |
| |
| static void process(void) |
| { |
| uint8_t buf[D_BCHAN_TX_GRAN]; |
| int rc, nread; |
| |
| while (rc = read(g_st.in_fd, buf, sizeof(buf))) { |
| OSMO_ASSERT(rc == sizeof(buf)); |
| nread = rc; |
| osmo_i460_demux_in(&g_st.i460_ts, buf, nread); |
| |
| for (int i = 1; i < 3; i++) { |
| struct sc_state *sc = &g_st.sc[i]; |
| int rc2 = osmo_rtp_socket_poll(sc->rtps); |
| sc->rtps->rx_user_ts += 160; |
| //printf("rtp_recv=%d (flags=%x)\n",rc2, sc->rtps->flags); |
| } |
| |
| /* write as many bytes as we just received */ |
| osmo_i460_mux_out(&g_st.i460_ts, buf, nread); |
| if (g_ts_is_writable) { |
| rc = write(g_st.in_fd, buf, nread); |
| if (rc != nread) |
| printf("rc=%d, nread=%d (%s)\n", rc, nread, strerror(errno)); |
| OSMO_ASSERT(rc == nread); |
| } |
| //usleep(20000); |
| } |
| } |
| |
| int main(int argc, char **argv) |
| { |
| osmo_init_logging2(NULL, NULL); |
| osmo_fsm_log_addr(false); |
| log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_BASENAME); |
| log_set_category_filter(osmo_stderr_target, DLMIB, true, LOGL_DEBUG); |
| osmo_rtp_init(NULL); |
| |
| init(argv[1]); |
| process(); |
| } |