From 3b5e3c4d6ff7835b8139a0d97a78cabac737a7ff Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther Date: Sat, 18 Sep 2010 06:35:29 +0800 Subject: mgcp: Prepare the CRCX/MDCX/DLCX messages for the transcoder. Send CRCX/MDCX/DLCX to the transcoder, fill out transcoder_end with the interesting data and hope that it is going to work. --- openbsc/src/mgcp/mgcp_protocol.c | 102 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) (limited to 'openbsc/src/mgcp/mgcp_protocol.c') diff --git a/openbsc/src/mgcp/mgcp_protocol.c b/openbsc/src/mgcp/mgcp_protocol.c index 80100061d..6d9a6b405 100644 --- a/openbsc/src/mgcp/mgcp_protocol.c +++ b/openbsc/src/mgcp/mgcp_protocol.c @@ -89,6 +89,9 @@ static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg) static struct msgb *handle_modify_con(struct mgcp_config *cfg, struct msgb *msg); static struct msgb *handle_rsip(struct mgcp_config *cfg, struct msgb *msg); +static void create_transcoder(struct mgcp_endpoint *endp); +static void delete_transcoder(struct mgcp_endpoint *endp); + static uint32_t generate_call_id(struct mgcp_config *cfg) { int i; @@ -512,6 +515,7 @@ static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg) break; case MGCP_POLICY_DEFER: /* stop processing */ + create_transcoder(endp); return NULL; break; case MGCP_POLICY_CONT: @@ -526,6 +530,7 @@ static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg) if (cfg->change_cb) cfg->change_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX); + create_transcoder(endp); return create_response_with_sdp(endp, "CRCX", trans_id); error: LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n", @@ -719,6 +724,7 @@ static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg) break; case MGCP_POLICY_DEFER: /* stop processing */ + delete_transcoder(endp); return NULL; break; case MGCP_POLICY_CONT: @@ -730,6 +736,8 @@ static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg) /* free the connection */ LOGP(DMGCP, LOGL_DEBUG, "Deleted endpoint on: 0x%x Server: %s:%u\n", ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port)); + + delete_transcoder(endp); mgcp_free_endp(endp); if (cfg->change_cb) cfg->change_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX); @@ -848,3 +856,97 @@ void mgcp_free_endp(struct mgcp_endpoint *endp) memset(&endp->taps, 0, sizeof(endp->taps)); } + +/* For transcoding we need to manage an in and an output that are connected */ +static int back_channel(int endpoint) +{ + return endpoint + 60; +} + +static void send_msg(struct mgcp_endpoint *endp, int endpoint, int port, + const char *msg, const char *mode) +{ + struct sockaddr_in addr; + char buf[2096]; + int len; + + /* hardcoded to AMR right now, we do not know the real type at this point */ + len = snprintf(buf, sizeof(buf), + "%s 42 %x@mgw MGCP 1.0\r\n" + "C: 4256\r\n" + "M: %s\r\n" + "\r\n" + "c=IN IP4 %s\r\n" + "m=audio %d RTP/AVP %d\r\n" + "a=rtpmap:%d %s\r\n", + msg, endpoint, mode, endp->cfg->source_addr, + port, endp->cfg->audio_payload, + endp->cfg->audio_payload, endp->cfg->audio_name); + + if (len < 0) + return; + + buf[sizeof(buf) - 1] = '\0'; + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr = endp->cfg->transcoder_in; + addr.sin_port = htons(2427); + sendto(endp->cfg->gw_fd.bfd.fd, buf, len, 0, + (struct sockaddr *) &addr, sizeof(addr)); +} + +static void send_dlcx(struct mgcp_endpoint *endp, int endpoint) +{ + struct sockaddr_in addr; + char buf[2096]; + int len; + + len = snprintf(buf, sizeof(buf), + "DLCX 43 %x@mgw MGCP 1.0\r\n" + "C: 4256\r\n" + , endpoint); + + if (len < 0) + return; + + buf[sizeof(buf) - 1] = '\0'; + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_addr = endp->cfg->transcoder_in; + addr.sin_port = htons(2427); + sendto(endp->cfg->gw_fd.bfd.fd, buf, len, 0, + (struct sockaddr *) &addr, sizeof(addr)); +} + +static void create_transcoder(struct mgcp_endpoint *endp) +{ + int port; + int in_endp = ENDPOINT_NUMBER(endp); + int out_endp = back_channel(in_endp); + + if (!endp->cfg->transcoder_ip) + return; + + send_msg(endp, in_endp, endp->bts_end.local_port, "CRCX", "recvonly"); + send_msg(endp, in_endp, endp->bts_end.local_port, "MDCX", "recvonly"); + send_msg(endp, out_endp, endp->transcoder_end.local_port, "CRCX", "sendrecv"); + send_msg(endp, out_endp, endp->transcoder_end.local_port, "MDCX", "sendrecv"); + + port = rtp_calculate_port(out_endp, 4000); + endp->transcoder_end.rtp_port = htons(port); + endp->transcoder_end.rtcp_port = htons(port + 1); +} + +static void delete_transcoder(struct mgcp_endpoint *endp) +{ + int in_endp = ENDPOINT_NUMBER(endp); + int out_endp = back_channel(in_endp); + + if (!endp->cfg->transcoder_ip) + return; + + send_dlcx(endp, in_endp); + send_dlcx(endp, out_endp); +} -- cgit v1.2.3