librtmp: Try to parse IPv6 addresses

This should (hopefully) allow URLs of the form rtmp://[abcd::1]/app

plugins/obs-outputs/librtmp/parseurl.c

@@ -27,7 +27,7 @@
 int RTMP_ParseURL(const char *url, int *protocol, AVal *host, unsigned int *port,
                   AVal *app)
 {
-    char *p, *end, *col, /* *ques, */ *slash;
+    char *p, *end, *col, /* *ques, */ *slash, *v6;
 
     RTMP_Log(RTMP_LOGDEBUG, "Parsing...");
 
@@ -83,9 +83,10 @@ parsehost:
     }
 
     end   = p + strlen(p);
-    col   = strchr(p, ':');
+    v6    = strchr(p, ']');
     // ques  = strchr(p, '?');
     slash = strchr(p, '/');
+    col   = strchr((v6 && v6 < slash) ? v6 : p, ':');
 
     {
         int hostlen;

plugins/obs-outputs/librtmp/rtmp.c

@@ -646,11 +646,12 @@ add_addr_info(struct sockaddr_storage *service, socklen_t *addrlen, AVal *host,
 {
     char *hostname;
     int ret = TRUE;
-    if (host->av_val[host->av_len])
+    if (host->av_val[host->av_len] || host->av_val[0] == '[')
     {
-        hostname = malloc(host->av_len+1);
-        memcpy(hostname, host->av_val, host->av_len);
-        hostname[host->av_len] = '\0';
+        int v6 = host->av_val[0] == '[';
+        hostname = malloc(host->av_len+1 - v6 * 2);
+        memcpy(hostname, host->av_val + v6, host->av_len - v6 * 2);
+        hostname[host->av_len - v6 * 2] = '\0';
     }
     else
     {