/*
* url syntax: rtp://host:port[?option=val...]
* option: 'multicast=1' : enable multicast
* 'ttl=n' : set the ttl value (for multicast only)
* 'localport=n' : set the local port to n
*
*/
static int rtp_open(URLContext *h, const char *uri, int flags)
{
RTPContext *s;
int port, is_output, is_multicast, ttl, local_port;
char hostname[256];
char buf[1024];
char path[1024];
const char *p;
is_output = (flags & URL_WRONLY);
s = av_mallocz(sizeof(RTPContext));
if (!s)
return AVERROR(ENOMEM);
h->priv_data = s;
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
path, sizeof(path), uri);
/* extract parameters */
is_multicast = 0;
ttl = -1;
local_port = -1;
p = strchr(uri, '?');
if (p) {
is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
ttl = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localport", p)) {
local_port = strtol(buf, NULL, 10);
}
}
build_udp_url(buf, sizeof(buf),
hostname, port, local_port, is_multicast, ttl);
if (url_open(&s->rtp_hd, buf, flags) < 0)
goto fail;
local_port = udp_get_local_port(s->rtp_hd);
/* XXX: need to open another connexion if the port is not even */
/* well, should suppress localport in path */
build_udp_url(buf, sizeof(buf),
hostname, port + 1, local_port + 1, is_multicast, ttl);
if (url_open(&s->rtcp_hd, buf, flags) < 0)
goto fail;
/* just to ease handle access. XXX: need to suppress direct handle
access */
s->rtp_fd = udp_get_file_handle(s->rtp_hd);
s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
h->is_streamed = 1;
return 0;
fail:
if (s->rtp_hd)
url_close(s->rtp_hd);
if (s->rtcp_hd)
url_close(s->rtcp_hd);
av_free(s);
return AVERROR_IO;
}
/**
* Return the local port used by the RTP connexion
* @param s1 media file context
* @return the local port number
*/
int rtp_get_local_port(URLContext *h)
{
RTPContext *s = h->priv_data;
return udp_get_local_port(s->rtp_hd);
}
static int rtp_open(URLContext *h, const char *uri, int flags)
{
RTPContext *s;
int rtp_port, rtcp_port,
is_output, ttl,
local_rtp_port, local_rtcp_port, max_packet_size;
char hostname[256];
char buf[1024];
char path[1024];
const char *p;
is_output = (flags & URL_WRONLY);
s = av_mallocz(sizeof(RTPContext));
if (!s)
return AVERROR(ENOMEM);
h->priv_data = s;
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
path, sizeof(path), uri);
/* extract parameters */
ttl = -1;
rtcp_port = rtp_port+1;
local_rtp_port = -1;
local_rtcp_port = -1;
max_packet_size = -1;
p = strchr(uri, '?');
if (p) {
if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
ttl = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
rtcp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
local_rtcp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
max_packet_size = strtol(buf, NULL, 10);
}
}
build_udp_url(buf, sizeof(buf),
hostname, rtp_port, local_rtp_port, ttl, max_packet_size);
if (url_open(&s->rtp_hd, buf, flags) < 0)
goto fail;
if (local_rtp_port>=0 && local_rtcp_port<0)
local_rtcp_port = udp_get_local_port(s->rtp_hd) + 1;
build_udp_url(buf, sizeof(buf),
hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size);
if (url_open(&s->rtcp_hd, buf, flags) < 0)
goto fail;
/* just to ease handle access. XXX: need to suppress direct handle
access */
s->rtp_fd = url_get_file_handle(s->rtp_hd);
s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
h->is_streamed = 1;
return 0;
fail:
if (s->rtp_hd)
url_close(s->rtp_hd);
if (s->rtcp_hd)
url_close(s->rtcp_hd);
av_free(s);
return AVERROR(EIO);
}
