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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.
This commit is contained in:
Holger Hans Peter Freyther 2010-09-18 06:35:29 +08:00
parent 218f8564e1
commit 3b5e3c4d6f
1 changed files with 102 additions and 0 deletions
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102
openbsc/src/mgcp/mgcp_protocol.c
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@ -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);
}