rtp: Fix play multiple multicast streams with the same port

We cannot play multiple multicast streams with the same port at the
same time. This is because both rtp and rtcp port are opened in
read-write mode, so they will not bind to the multicast address. Try
to make rtp port as read-only by default to solve this bug.
Signed-off-by: Zhao Zhili <wantlamy@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/rtpproto.c

@@ -323,6 +323,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
     char path[1024];
     const char *p;
     int i, max_retry_count = 3;
+    int rtcpflags;
 
     av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
                  path, sizeof(path), uri);
@@ -388,12 +389,13 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
             s->local_rtpport = -1;
             continue;
         }
+        rtcpflags = flags | AVIO_FLAG_WRITE;
         if (s->local_rtcpport < 0) {
             s->local_rtcpport = s->local_rtpport + 1;
             build_udp_url(s, buf, sizeof(buf),
                           hostname, s->rtcp_port, s->local_rtcpport,
                           sources, block);
-            if (ffurl_open_whitelist(&s->rtcp_hd, buf, flags,
+            if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags,
                                      &h->interrupt_callback, NULL,
                                      h->protocol_whitelist, h->protocol_blacklist) < 0) {
                 s->local_rtpport = s->local_rtcpport = -1;
@@ -404,7 +406,7 @@ static int rtp_open(URLContext *h, const char *uri, int flags)
         build_udp_url(s, buf, sizeof(buf),
                       hostname, s->rtcp_port, s->local_rtcpport,
                       sources, block);
-        if (ffurl_open_whitelist(&s->rtcp_hd, buf, flags, &h->interrupt_callback,
+        if (ffurl_open_whitelist(&s->rtcp_hd, buf, rtcpflags, &h->interrupt_callback,
                                  NULL, h->protocol_whitelist, h->protocol_blacklist) < 0)
             goto fail;
         break;

libavformat/rtsp.c

@@ -2316,7 +2316,7 @@ static int sdp_read_header(AVFormatContext *s)
             append_source_addrs(url, sizeof(url), "block",
                                 rtsp_st->nb_exclude_source_addrs,
                                 rtsp_st->exclude_source_addrs);
-            err = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
+            err = ffurl_open_whitelist(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ,
                            &s->interrupt_callback, &opts, s->protocol_whitelist, s->protocol_blacklist);
 
             av_dict_free(&opts);