avformat/rtsp: add support for satip://

The SAT>IP protocol[1] is similar to RTSP. However SAT>IP servers
are assumed to speak only MP2T, so DESCRIBE is not used in the same
way. When no streams are active, DESCRIBE will return 404 according
to the spec (see section 3.5.7). When streams are active, DESCRIBE
will return a list of all current streams along with information
about their signal strengths.

Previously, attemping to use ffmpeg with a rtsp:// url that points
to a SAT>IP server would work with some devices, but fail due to 404
response on others. Further, if the SAT>IP server was already
streaming, ffmpeg would incorrectly consume the DESCRIBE SDP response
and join an existing tuner instead of requesting a new session with
the URL provided by the user. These issues have been noted by many
users across the internet[2][3][4].

This commit adds proper spec-compliant support for SAT>IP, including:

- support for the satip:// psuedo-protocol[5]
- avoiding the use of DESCRIBE
- parsing and consuming the com.ses.streamID response header
- using "Transport: RTP/AVP;unicast" because the optional "/UDP"
  suffix confuses some servers

This patch has been validated against multiple SAT>IP vendor devices:

- Telestar Digibit R2
  (https://telestar.de/en/produkt/digibit-r1-2/)
- Kathrein EXIP 418
  (https://www.kathrein-ds.com/en/produkte/sat-zf-verteiltechnik/sat-ip/227/exip-418)
- Kathrein EXIP 4124
  (https://www.kathrein-ds.com/en/products/sat-if-signal-distribution/sat-ip/226/exip-4124)
- Megasat MEG-8000
  (https://www.megasat.tv/produkt/sat-ip-server-3/)
- Megasat Twin
  (https://www.megasat.tv/en/produkt/sat-ip-server-twin/)
- Triax TSS 400
  (https://www.conrad.com/p/triax-tss-400-mkii-sat-ip-server-595256)

[1] https://www.satip.info/sites/satip/files/resource/satip_specification_version_1_2_2.pdf
[2] https://stackoverflow.com/questions/61194344/does-ffmpeg-violate-the-satip-specification-describe-syntax
[3] https://github.com/kodi-pvr/pvr.iptvsimple/issues/196
[4] https://forum.kodi.tv/showthread.php?tid=359072&pid=2995884#pid2995884
[5] https://www.satip.info/resources/channel-lists/

3 files changed, 54 insertions, 6 deletions

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index ac38fd05d0..1f506129eb 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -252,6 +252,25 @@ static void finalize_rtp_handler_init(AVFormatContext *s, RTSPStream *rtsp_st,
     }
 }
 
+static int init_satip_stream(AVFormatContext *s)
+{
+    RTSPState *rt = s->priv_data;
+    RTSPStream *rtsp_st = av_mallocz(sizeof(RTSPStream));
+    if (!rtsp_st)
+        return AVERROR(ENOMEM);
+    dynarray_add(&rt->rtsp_streams,
+                 &rt->nb_rtsp_streams, rtsp_st);
+
+    rtsp_st->sdp_payload_type = 33; // MP2T
+    av_strlcpy(rtsp_st->control_url,
+               rt->control_uri, sizeof(rtsp_st->control_url));
+
+    rtsp_st->stream_index = -1;
+    init_rtp_handler(&ff_mpegts_dynamic_handler, rtsp_st, NULL);
+    finalize_rtp_handler_init(s, rtsp_st, NULL);
+    return 0;
+}
+
 /* parse the rtpmap description: <codec_name>/<clock_rate>[/<other params>] */
 static int sdp_parse_rtpmap(AVFormatContext *s,
                             AVStream *st, RTSPStream *rtsp_st,
@@ -1116,6 +1135,9 @@ void ff_rtsp_parse_line(AVFormatContext *s,
     } else if (av_stristart(p, "Content-Type:", &p)) {
         p += strspn(p, SPACE_CHARS);
         av_strlcpy(reply->content_type, p, sizeof(reply->content_type));
+    } else if (av_stristart(p, "com.ses.streamID:", &p)) {
+        p += strspn(p, SPACE_CHARS);
+        av_strlcpy(reply->stream_id, p, sizeof(reply->stream_id));
     }
 }
 
@@ -1495,8 +1517,10 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
         rtp_opened:
             port = ff_rtp_get_local_rtp_port(rtsp_st->rtp_handle);
         have_port:
-            snprintf(transport, sizeof(transport) - 1,
-                     "%s/UDP;", trans_pref);
+            av_strlcpy(transport, trans_pref, sizeof(transport));
+            av_strlcat(transport,
+                       rt->server_type == RTSP_SERVER_SATIP ? ";" : "/UDP;",
+                       sizeof(transport));
             if (rt->server_type != RTSP_SERVER_REAL)
                 av_strlcat(transport, "unicast;", sizeof(transport));
             av_strlcatf(transport, sizeof(transport),
@@ -1559,6 +1583,15 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
             goto fail;
         }
 
+        if (rt->server_type == RTSP_SERVER_SATIP && reply->stream_id[0]) {
+            char proto[128], host[128], path[512], auth[128];
+            int port;
+            av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host),
+                        &port, path, sizeof(path), rt->control_uri);
+            ff_url_join(rt->control_uri, sizeof(rt->control_uri), proto, NULL, host,
+                        port, "/stream=%s", reply->stream_id);
+        }
+
         /* XXX: same protocol for all streams is required */
         if (i > 0) {
             if (reply->transports[0].lower_transport != rt->lower_transport ||
@@ -1710,6 +1743,9 @@ redirect:
         lower_rtsp_proto         = "tls";
         default_port             = RTSPS_DEFAULT_PORT;
         rt->lower_transport_mask = 1 << RTSP_LOWER_TRANSPORT_TCP;
+    } else if (!strcmp(proto, "satip")) {
+        av_strlcpy(proto, "rtsp", sizeof(proto));
+        rt->server_type = RTSP_SERVER_SATIP;
     }
 
     if (*auth) {
@@ -1857,7 +1893,9 @@ redirect:
 
     /* request options supported by the server; this also detects server
      * type */
-    for (rt->server_type = RTSP_SERVER_RTP;;) {
+    if (rt->server_type != RTSP_SERVER_SATIP)
+        rt->server_type = RTSP_SERVER_RTP;
+    for (;;) {
         cmd[0] = 0;
         if (rt->server_type == RTSP_SERVER_REAL)
             av_strlcat(cmd,
@@ -1892,9 +1930,12 @@ redirect:
         break;
     }
 
-    if (CONFIG_RTSP_DEMUXER && s->iformat)
-        err = ff_rtsp_setup_input_streams(s, reply);
-    else if (CONFIG_RTSP_MUXER)
+    if (CONFIG_RTSP_DEMUXER && s->iformat) {
+        if (rt->server_type == RTSP_SERVER_SATIP)
+            err = init_satip_stream(s);
+        else
+            err = ff_rtsp_setup_input_streams(s, reply);
+    } else if (CONFIG_RTSP_MUXER)
         err = ff_rtsp_setup_output_streams(s, host);
     else
         av_assert0(0);
diff --git a/libavformat/rtsp.h b/libavformat/rtsp.h
index b74cdc148a..239ea8a0eb 100644
--- a/libavformat/rtsp.h
+++ b/libavformat/rtsp.h
@@ -188,6 +188,11 @@ typedef struct RTSPMessageHeader {
      * Content type header
      */
     char content_type[64];
+
+    /**
+     * SAT>IP com.ses.streamID header
+     */
+    char stream_id[64];
 } RTSPMessageHeader;
 
 /**
@@ -210,6 +215,7 @@ enum RTSPServerType {
     RTSP_SERVER_RTP,  /**< Standards-compliant RTP-server */
     RTSP_SERVER_REAL, /**< Realmedia-style server */
     RTSP_SERVER_WMS,  /**< Windows Media server */
+    RTSP_SERVER_SATIP,/**< SAT>IP server */
     RTSP_SERVER_NB
 };
 
diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c
index bfbb01d586..113da975e1 100644
--- a/libavformat/rtspdec.c
+++ b/libavformat/rtspdec.c
@@ -724,6 +724,7 @@ static int rtsp_probe(const AVProbeData *p)
 #if CONFIG_TLS_PROTOCOL
         av_strstart(p->filename, "rtsps:", NULL) ||
 #endif
+        av_strstart(p->filename, "satip:", NULL) ||
         av_strstart(p->filename, "rtsp:", NULL))
         return AVPROBE_SCORE_MAX;
     return 0;