| module RTP_Emulation { |
| |
| /* Functionalities that we want this module to imeplement: |
| * * act as a RTP source that generates a RTP Stream |
| * * act asaa RTP sink that consumes a RTP Stream |
| * |
| * for all of the above, we want to be able to |
| * * specify the payload type |
| * * specify the interval / sample rate |
| * * create drop-outs in the stream |
| * * detect reordered or lost frames |
| * * validate if the size of the frames matches epectations |
| * * play back real audio (at least some tones?) |
| * * enable/disable generation/verification of RTCP |
| */ |
| |
| /* Ideas: |
| |
| * each component consists of transmitter and receiver |
| * transmitters and receivers can be operated as tuple? |
| * high-level operation |
| ** set-up config at transmitter + receiver |
| ** transmit sequence of payloads |
| ** verify receiption of those payloads |
| * can operate full-duplex/bi-directional as needed |
| |
| * transmitter |
| ** trigger transmission of n number of packets |
| ** transmit them at normal ptime interval |
| ** payload size configurable |
| ** payload contents PRBS or the like |
| |
| * receiver |
| ** count number of related packets at receiver |
| ** check received payload type |
| ** check received timestamp increments |
| ** check received seq_nr increments |
| ** (optionally) check for SSRC |
| ** (optionally) check for payload size |
| ** (optionally) check for payload contents |
| |
| * later |
| ** how to test transcoding? |
| ** how to test pure play-out endpoints (rx only)? |
| ** how to test "Rx from wrong IP/port" scenarios? |
| ** how to test RTCP? |
| ** maybe keep ports un-connected to show wrong src -lrt |
| |
| */ |
| |
| |
| |
| |
| import from General_Types all; |
| import from Osmocom_Types all; |
| import from IPL4asp_Types all; |
| import from RTP_Types all; |
| import from RTP_CodecPort all; |
| import from RTP_CodecPort_CtrlFunct all; |
| |
| import from IuUP_Types all; |
| import from IuUP_Emulation all; |
| |
| type component RTP_Emulation_CT { |
| /* down-facing ports for RTP and RTCP codec ports on top of IPL4asp */ |
| port RTP_CODEC_PT RTP; |
| var integer g_rtp_conn_id := -1; |
| port RTP_CODEC_PT RTCP; |
| var integer g_rtcp_conn_id := -1; |
| |
| /* user-facing port for controlling the binding */ |
| port RTPEM_CTRL_PT CTRL; |
| |
| /* configurable by user, should be fixed */ |
| var RtpemConfig g_cfg := c_RtpemDefaultCfg; |
| |
| /* statistics */ |
| var RtpemStats g_stats_rtp := c_RtpemStatsReset; |
| var RtpemStats g_stats_rtcp := c_RtpemStatsReset; |
| |
| var HostName g_remote_host; |
| var PortNumber g_remote_port; |
| var HostName g_local_host; |
| var PortNumber g_local_port; |
| |
| /* state variables, change over time */ |
| var boolean g_rx_enabled := false; |
| var LIN2_BO_LAST g_tx_next_seq := 0; |
| var uint32_t g_tx_next_ts := 0; |
| |
| var INT7b g_rx_payload_type := 0; |
| var LIN2_BO_LAST g_rx_last_seq; |
| var uint32_t g_rx_last_ts; |
| |
| var IuUP_Entity g_iuup_ent; // := valueof(t_IuUP_Entity(1)); |
| } |
| |
| type enumerated RtpemMode { |
| RTPEM_MODE_NONE, |
| RTPEM_MODE_TXONLY, |
| RTPEM_MODE_RXONLY, |
| RTPEM_MODE_BIDIR |
| }; |
| |
| type record RtpemStats { |
| /* number of packets transmitted */ |
| integer num_pkts_tx, |
| /* number of RTP payload bytes transmitted */ |
| integer bytes_payload_tx, |
| |
| /* number of packets received */ |
| integer num_pkts_rx, |
| /* number of RTP payload bytes received */ |
| integer bytes_payload_rx, |
| /* number of packets received out-of-sequence */ |
| integer num_pkts_rx_err_seq, |
| /* number of packets received wrong timestamp */ |
| integer num_pkts_rx_err_ts, |
| /* number of packets received during Rx disable */ |
| integer num_pkts_rx_err_disabled |
| } |
| |
| const RtpemStats c_RtpemStatsReset := { |
| num_pkts_tx := 0, |
| bytes_payload_tx := 0, |
| num_pkts_rx := 0, |
| bytes_payload_rx := 0, |
| num_pkts_rx_err_seq := 0, |
| num_pkts_rx_err_ts := 0, |
| num_pkts_rx_err_disabled := 0 |
| } |
| |
| type record RtpemConfig { |
| INT7b tx_payload_type, |
| integer tx_samplerate_hz, |
| integer tx_duration_ms, |
| BIT32_BO_LAST tx_ssrc, |
| octetstring tx_fixed_payload optional, |
| boolean iuup_mode, |
| boolean iuup_tx_init |
| }; |
| |
| const RtpemConfig c_RtpemDefaultCfg := { |
| tx_payload_type := 0, |
| tx_samplerate_hz := 8000, |
| tx_duration_ms := 20, |
| tx_ssrc := '11011110101011011011111011101111'B, |
| tx_fixed_payload := '01020304'O, |
| iuup_mode := false, |
| iuup_tx_init := true |
| } |
| |
| signature RTPEM_bind(in HostName local_host, inout PortNumber local_port); |
| signature RTPEM_connect(in HostName remote_host, in PortNumber remote_port); |
| signature RTPEM_mode(in RtpemMode mode); |
| signature RTPEM_configure(in RtpemConfig cfg); |
| signature RTPEM_stats_get(out RtpemStats stats, in boolean rtcp); |
| |
| type port RTPEM_CTRL_PT procedure { |
| inout RTPEM_bind, RTPEM_connect, RTPEM_mode, RTPEM_configure, RTPEM_stats_get; |
| } with { extension "internal" }; |
| |
| template PDU_RTP ts_RTP(BIT32_BO_LAST ssrc, INT7b pt, LIN2_BO_LAST seq, uint32_t ts, |
| octetstring payload, BIT1 marker := '0'B) := { |
| version := 2, |
| padding_ind := '0'B, |
| extension_ind := '0'B, |
| CSRC_count := 0, |
| marker_bit := marker, |
| payload_type := pt, |
| sequence_number := seq, |
| time_stamp := int2bit(ts, 32), |
| SSRC_id := ssrc, |
| CSRCs := omit, |
| ext_header := omit, |
| data := payload |
| } |
| |
| private function f_tx_rtp(octetstring payload, BIT1 marker := '0'B) runs on RTP_Emulation_CT { |
| if (g_cfg.iuup_mode) { |
| payload := f_IuUP_Em_tx_encap(g_iuup_ent, payload); |
| } |
| var PDU_RTP rtp := valueof(ts_RTP(g_cfg.tx_ssrc, g_cfg.tx_payload_type, g_tx_next_seq, |
| g_tx_next_ts, payload, marker)); |
| RTP.send(t_RTP_Send(g_rtp_conn_id, RTP_messages_union:{rtp:=rtp})); |
| /* increment sequence + timestamp for next transmit */ |
| g_tx_next_seq := g_tx_next_seq + 1; |
| g_tx_next_ts := g_tx_next_ts + (g_cfg.tx_samplerate_hz / (1000 / g_cfg.tx_duration_ms)); |
| } |
| |
| function f_main() runs on RTP_Emulation_CT |
| { |
| var Result res; |
| var boolean is_rtcp |
| |
| timer T_transmit := int2float(g_cfg.tx_duration_ms)/1000.0; |
| var RTP_RecvFrom rx_rtp; |
| var RtpemConfig cfg; |
| var template RTP_RecvFrom tr := { |
| connId := ?, |
| remName := ?, |
| remPort := ?, |
| locName := ?, |
| locPort := ?, |
| msg := ? |
| }; |
| var template RTP_RecvFrom tr_rtp := tr; |
| var template RTP_RecvFrom tr_rtcp := tr; |
| tr_rtp.connId := g_rtp_conn_id; |
| tr_rtp.msg := { rtp := ? }; |
| tr_rtp.connId := g_rtcp_conn_id; |
| tr_rtcp.msg := { rtcp := ? }; |
| |
| g_iuup_ent := valueof(t_IuUP_Entity(g_cfg.iuup_tx_init)); |
| |
| while (true) { |
| alt { |
| /* control procedures (calls) from the user */ |
| [] CTRL.getcall(RTPEM_bind:{?,?}) -> param(g_local_host, g_local_port) { |
| if (g_local_port rem 2 == 1) { |
| //CTRL.raise(RTPEM_bind, "Local Port is not an even port number!"); |
| log("Local Port is not an even port number!"); |
| continue; |
| } |
| res := RTP_CodecPort_CtrlFunct.f_IPL4_listen(RTP, g_local_host, |
| g_local_port, {udp:={}}); |
| g_rtp_conn_id := res.connId; |
| res := RTP_CodecPort_CtrlFunct.f_IPL4_listen(RTP, g_local_host, |
| g_local_port+1, {udp:={}}); |
| g_rtcp_conn_id := res.connId; |
| CTRL.reply(RTPEM_bind:{g_local_host, g_local_port}); |
| } |
| [] CTRL.getcall(RTPEM_connect:{?,?}) -> param (g_remote_host, g_remote_port) { |
| if (g_remote_port rem 2 == 1) { |
| //CTRL.raise(RTPEM_connect, "Remote Port is not an even number!"); |
| log("Remote Port is not an even number!"); |
| continue; |
| } |
| res := RTP_CodecPort_CtrlFunct.f_IPL4_connect(RTP, g_remote_host, |
| g_remote_port, |
| g_local_host, g_local_port, |
| g_rtp_conn_id, {udp:={}}); |
| res := RTP_CodecPort_CtrlFunct.f_IPL4_connect(RTCP, g_remote_host, |
| g_remote_port+1, |
| g_local_host, g_local_port+1, |
| g_rtcp_conn_id, {udp:={}}); |
| CTRL.reply(RTPEM_connect:{g_remote_host, g_remote_port}); |
| } |
| [] CTRL.getcall(RTPEM_mode:{RTPEM_MODE_NONE}) { |
| T_transmit.stop; |
| g_rx_enabled := false; |
| CTRL.reply(RTPEM_mode:{RTPEM_MODE_NONE}); |
| } |
| [] CTRL.getcall(RTPEM_mode:{RTPEM_MODE_TXONLY}) { |
| /* start transmit timer */ |
| T_transmit.start; |
| g_rx_enabled := false; |
| CTRL.reply(RTPEM_mode:{RTPEM_MODE_TXONLY}); |
| } |
| [] CTRL.getcall(RTPEM_mode:{RTPEM_MODE_RXONLY}) { |
| |
| T_transmit.stop; |
| if (g_rx_enabled == false) { |
| /* flush queues */ |
| RTP.clear; |
| RTCP.clear; |
| g_rx_enabled := true; |
| } |
| CTRL.reply(RTPEM_mode:{RTPEM_MODE_RXONLY}); |
| } |
| [] CTRL.getcall(RTPEM_mode:{RTPEM_MODE_BIDIR}) { |
| T_transmit.start; |
| if (g_rx_enabled == false) { |
| /* flush queues */ |
| RTP.clear; |
| RTCP.clear; |
| g_rx_enabled := true; |
| } |
| CTRL.reply(RTPEM_mode:{RTPEM_MODE_BIDIR}); |
| } |
| [] CTRL.getcall(RTPEM_configure:{?}) -> param (cfg) { |
| g_cfg := cfg; |
| g_iuup_ent.cfg.active_init := g_cfg.iuup_tx_init; |
| CTRL.reply(RTPEM_configure:{cfg}); |
| } |
| [] CTRL.getcall(RTPEM_stats_get:{?, ?}) -> param (is_rtcp) { |
| if (is_rtcp) { |
| CTRL.reply(RTPEM_stats_get:{g_stats_rtcp, is_rtcp}); |
| } else { |
| CTRL.reply(RTPEM_stats_get:{g_stats_rtp, is_rtcp}); |
| } |
| } |
| |
| |
| |
| /* simply ignore any RTTP/RTP if receiver not enabled */ |
| [g_rx_enabled==false] RTP.receive(tr_rtp) { |
| g_stats_rtp.num_pkts_rx_err_disabled := g_stats_rtp.num_pkts_rx_err_disabled+1; |
| } |
| [g_rx_enabled==false] RTCP.receive(tr_rtp) { |
| g_stats_rtcp.num_pkts_rx_err_disabled := g_stats_rtcp.num_pkts_rx_err_disabled+1; |
| } |
| |
| /* process received RTCP/RTP if receiver enabled */ |
| [g_rx_enabled] RTP.receive(tr_rtp) -> value rx_rtp { |
| log("RX RTP: ", rx_rtp); |
| /* increment counters */ |
| g_stats_rtp.num_pkts_rx := g_stats_rtp.num_pkts_rx+1; |
| g_stats_rtp.bytes_payload_rx := g_stats_rtp.bytes_payload_rx + |
| lengthof(rx_rtp.msg.rtp.data); |
| if (g_cfg.iuup_mode) { |
| rx_rtp.msg.rtp.data := f_IuUP_Em_rx_decaps(g_iuup_ent, rx_rtp.msg.rtp.data); |
| } |
| } |
| [g_rx_enabled] RTCP.receive(tr_rtcp) -> value rx_rtp { |
| log("RX RTCP: ", rx_rtp); |
| g_stats_rtcp.num_pkts_rx := g_stats_rtcp.num_pkts_rx+1; |
| } |
| |
| /* transmit if timer has expired */ |
| [] T_transmit.timeout { |
| /* send one RTP frame, re-start timer */ |
| f_tx_rtp(g_cfg.tx_fixed_payload); |
| T_transmit.start; |
| /* update counters */ |
| g_stats_rtp.num_pkts_tx := g_stats_rtp.num_pkts_tx+1; |
| g_stats_rtp.bytes_payload_tx := g_stats_rtp.bytes_payload_tx + |
| lengthof(g_cfg.tx_fixed_payload); |
| } |
| |
| /* fail on any unexpected messages */ |
| [] RTP.receive { |
| setverdict(fail, "Received unexpected type from RTP"); |
| } |
| [] RTCP.receive { |
| setverdict(fail, "Received unexpected type from RTCP"); |
| } |
| } |
| } |
| } |
| |
| |
| } |