rtmp: Add a new option 'rtmp_pageurl'

This option specifies the URL of the web page in which the media
was embedded.
Signed-off-by: Martin Storsjö <martin@martin.st>

doc/protocols.texi

@@ -229,6 +229,10 @@ playpath. If a live stream of that name is not found, it plays the
 recorded stream. The other possible values are @code{live} and
 @code{recorded}.
 
+@item rtmp_pageurl
+URL of the web page in which the media was embedded. By default no
+value will be sent.
+
 @item rtmp_playpath
 Stream identifier to play or to publish. This option overrides the
 parameter specified in the URI.

libavformat/rtmpproto.c

@@ -90,6 +90,7 @@ typedef struct RTMPContext {
     char*         tcurl;                      ///< url of the target stream
     char*         flashver;                   ///< version of the flash plugin
     char*         swfurl;                     ///< url of the swf player
+    char*         pageurl;                    ///< url of the web page
     int           server_bw;                  ///< server bandwidth
     int           client_buffer_time;         ///< client buffer time in ms
     int           flush_interval;             ///< number of packets flushed in the same request (RTMPT only)
@@ -232,6 +233,11 @@ static int gen_connect(URLContext *s, RTMPContext *rt)
         ff_amf_write_number(&p, 252.0);
         ff_amf_write_field_name(&p, "videoFunction");
         ff_amf_write_number(&p, 1.0);
+
+        if (rt->pageurl) {
+            ff_amf_write_field_name(&p, "pageUrl");
+            ff_amf_write_string(&p, rt->pageurl);
+        }
     }
     ff_amf_write_object_end(&p);
 
@@ -1498,6 +1504,7 @@ static const AVOption rtmp_options[] = {
     {"any", "both", 0, AV_OPT_TYPE_CONST, {-2}, 0, 0, DEC, "rtmp_live"},
     {"live", "live stream", 0, AV_OPT_TYPE_CONST, {-1}, 0, 0, DEC, "rtmp_live"},
     {"recorded", "recorded stream", 0, AV_OPT_TYPE_CONST, {0}, 0, 0, DEC, "rtmp_live"},
+    {"rtmp_pageurl", "URL of the web page in which the media was embedded. By default no value will be sent.", OFFSET(pageurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
     {"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
     {"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
     {"rtmp_tcurl", "URL of the target stream. Defaults to proto://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},