| #pragma once |
| |
| #include <inttypes.h> |
| #include <stdbool.h> |
| |
| #include <osmocom/core/socket.h> |
| |
| #include <osmocom/mgcp/mgcp.h> |
| |
| /* The following constant defines an RTP dummy payload that is used for |
| * "UDP Hole Punching" (NAT) */ |
| static const char rtp_dummy_payload[] = { 0x23 }; |
| |
| /* Check if the data in a given message buffer matches the rtp dummy payload |
| * defined above */ |
| #define mgcp_is_rtp_dummy_payload(msg) \ |
| (msgb_length(msg) == sizeof(rtp_dummy_payload) && \ |
| memcmp(msgb_data(msg), rtp_dummy_payload, sizeof(rtp_dummy_payload)) == 0) |
| |
| #define RTP_BUF_SIZE 4096 |
| |
| struct mgcp_rtp_stream_state { |
| uint32_t ssrc; |
| uint16_t last_seq; |
| uint32_t last_timestamp; |
| struct rate_ctr *err_ts_ctr; |
| int32_t last_tsdelta; |
| uint32_t last_arrival_time; |
| }; |
| |
| struct mgcp_rtp_state { |
| /* has this state structure been initialized? */ |
| int initialized; |
| |
| struct { |
| /* are we patching the SSRC value? */ |
| bool patch_ssrc; |
| /* original SSRC (to which we shall patch any different SSRC) */ |
| uint32_t orig_ssrc; |
| /* offset to apply on the sequence number */ |
| int seq_offset; |
| /* offset to apply on the timestamp number */ |
| int32_t timestamp_offset; |
| } patch; |
| |
| /* duration of a packet (FIXME: in which unit?) */ |
| uint32_t packet_duration; |
| |
| /* Note: These states are not continuously updated, they serve as an |
| * information source to patch certain values in the RTP header. Do |
| * not use this state if constantly updated data about the RTP stream |
| * is needed. (see also mgcp_patch_and_count() */ |
| struct mgcp_rtp_stream_state in_stream; |
| struct mgcp_rtp_stream_state out_stream; |
| |
| /* jitter and packet loss calculation */ |
| struct { |
| int initialized; |
| uint16_t base_seq; |
| uint16_t max_seq; |
| uint32_t ssrc; |
| uint32_t jitter; |
| int32_t transit; |
| int cycles; |
| } stats; |
| |
| /* Alternative values for RTP tx, in case no sufficient header |
| * information is available so the header needs to be generated |
| * locally (when just forwarding packets, the header of incoming |
| * data is just re-used) */ |
| uint16_t alt_rtp_tx_sequence; |
| uint32_t alt_rtp_tx_ssrc; |
| |
| bool patched_first_rtp_payload; /* FIXME: drop this, see OS#2459 */ |
| }; |
| |
| struct mgcp_rtp_codec { |
| uint32_t rate; |
| int channels; |
| uint32_t frame_duration_num; |
| uint32_t frame_duration_den; |
| |
| int payload_type; |
| char audio_name[64]; |
| char subtype_name[64]; |
| |
| bool param_present; |
| struct mgcp_codec_param param; |
| }; |
| |
| /* 'mgcp_rtp_end': basically a wrapper around the RTP+RTCP ports */ |
| struct mgcp_rtp_end { |
| /* remote IP address of the RTP socket */ |
| struct osmo_sockaddr addr; |
| |
| /* in network byte order */ |
| int rtp_port, rtcp_port; |
| |
| /* currently selected audio codec */ |
| struct mgcp_rtp_codec *codec; |
| |
| /* array with assigned audio codecs to choose from (SDP) */ |
| struct mgcp_rtp_codec codecs[MGCP_MAX_CODECS]; |
| |
| /* number of assigned audio codecs (SDP) */ |
| unsigned int codecs_assigned; |
| |
| /* per endpoint data */ |
| int frames_per_packet; |
| uint32_t packet_duration_ms; |
| int maximum_packet_time; /* -1: not set */ |
| char *fmtp_extra; |
| /* are we transmitting packets (1) or dropping (0) outbound packets */ |
| int output_enabled; |
| /* FIXME: This parameter can be set + printed, but is nowhere used! */ |
| int force_output_ptime; |
| |
| /* RTP patching */ |
| int force_constant_ssrc; /* -1: always, 0: don't, 1: once */ |
| /* should we perform align_rtp_timestamp_offset() (1) or not (0) */ |
| int force_aligned_timing; |
| bool rfc5993_hr_convert; |
| |
| /* Each end has a separate socket for RTP and RTCP */ |
| struct osmo_fd rtp; |
| struct osmo_fd rtcp; |
| |
| /* local UDP port number of the RTP socket; RTCP is +1 */ |
| int local_port; |
| /* where the endpoint RTP connection binds to, set during CRCX and |
| * possibly updated during MDCX */ |
| char local_addr[INET6_ADDRSTRLEN]; |
| }; |
| |
| bool mgcp_rtp_end_remote_addr_available(const struct mgcp_rtp_end *rtp_end); |
| |
| struct mgcp_rtp_tap { |
| /* is this tap active (1) or not (0) */ |
| int enabled; |
| /* IP/port to which we're forwarding the tapped data */ |
| struct osmo_sockaddr forward; |
| }; |
| |
| struct mgcp_conn; |
| |
| int mgcp_send(struct mgcp_endpoint *endp, int is_rtp, struct osmo_sockaddr *addr, |
| struct msgb *msg, struct mgcp_conn_rtp *conn_src, |
| struct mgcp_conn_rtp *conn_dst); |
| int mgcp_send_dummy(struct mgcp_endpoint *endp, struct mgcp_conn_rtp *conn); |
| int mgcp_dispatch_rtp_bridge_cb(struct msgb *msg); |
| void mgcp_cleanup_rtp_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn); |
| int mgcp_dispatch_e1_bridge_cb(struct msgb *msg); |
| void mgcp_cleanup_e1_bridge_cb(struct mgcp_endpoint *endp, struct mgcp_conn *conn); |
| int mgcp_bind_net_rtp_port(struct mgcp_endpoint *endp, int rtp_port, |
| struct mgcp_conn_rtp *conn); |
| void mgcp_free_rtp_port(struct mgcp_rtp_end *end); |
| void mgcp_patch_and_count(const struct mgcp_endpoint *endp, |
| struct mgcp_rtp_state *state, |
| struct mgcp_rtp_end *rtp_end, |
| struct osmo_sockaddr *addr, struct msgb *msg); |
| void mgcp_get_local_addr(char *addr, struct mgcp_conn_rtp *conn); |
| |
| /* payload processing default functions */ |
| int mgcp_rtp_processing_default(struct mgcp_endpoint *endp, struct mgcp_rtp_end *dst_end, |
| char *data, int *len, int buf_size); |
| |
| int mgcp_setup_rtp_processing_default(struct mgcp_endpoint *endp, |
| struct mgcp_conn_rtp *conn_dst, |
| struct mgcp_conn_rtp *conn_src); |
| |
| void mgcp_get_net_downlink_format_default(struct mgcp_endpoint *endp, |
| const struct mgcp_rtp_codec **codec, |
| const char **fmtp_extra, |
| struct mgcp_conn_rtp *conn); |
| |
| /* internal RTP Annex A counting */ |
| void mgcp_rtp_annex_count(const struct mgcp_endpoint *endp, struct mgcp_rtp_state *state, |
| const uint16_t seq, const int32_t transit, |
| const uint32_t ssrc, const bool marker_bit); |