Add functions to send RTSP commands with content attached to them. This will

be used eventually in the RTSP muxer (see thread "[PATCH] RTSP muxer, round
3" on mailinglist).

Patch by Martin Storsjö <$firstname $firstname st>.

Originally committed as revision 21862 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtsp.c

@@ -932,7 +932,10 @@ static int rtsp_read_reply(AVFormatContext *s, RTSPMessageHeader *reply,
     return 0;
 }
 
-static void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
+static void rtsp_send_cmd_with_content_async(AVFormatContext *s,
+                                             const char *cmd,
+                                             const unsigned char *send_content,
+                                             int send_content_length)
 {
     RTSPState *rt = s->priv_data;
     char buf[4096], buf1[1024];
@@ -949,14 +952,23 @@ static void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
         av_strlcatf(buf, sizeof(buf),
                     "Authorization: Basic %s\r\n",
                     rt->auth_b64);
+    if (send_content_length > 0 && send_content)
+        av_strlcatf(buf, sizeof(buf), "Content-Length: %d\r\n", send_content_length);
     av_strlcat(buf, "\r\n", sizeof(buf));
 
     dprintf(s, "Sending:\n%s--\n", buf);
 
     url_write(rt->rtsp_hd, buf, strlen(buf));
+    if (send_content_length > 0 && send_content)
+        url_write(rt->rtsp_hd, send_content, send_content_length);
     rt->last_cmd_time = av_gettime();
 }
 
+static void rtsp_send_cmd_async(AVFormatContext *s, const char *cmd)
+{
+    rtsp_send_cmd_with_content_async(s, cmd, NULL, 0);
+}
+
 static void rtsp_send_cmd(AVFormatContext *s,
                           const char *cmd, RTSPMessageHeader *reply,
                           unsigned char **content_ptr)
@@ -966,6 +978,18 @@ static void rtsp_send_cmd(AVFormatContext *s,
     rtsp_read_reply(s, reply, content_ptr, 0);
 }
 
+static void rtsp_send_cmd_with_content(AVFormatContext *s,
+                                       const char *cmd,
+                                       RTSPMessageHeader *reply,
+                                       unsigned char **content_ptr,
+                                       const unsigned char *send_content,
+                                       int send_content_length)
+{
+    rtsp_send_cmd_with_content_async(s, cmd, send_content, send_content_length);
+
+    rtsp_read_reply(s, reply, content_ptr, 0);
+}
+
 /**
  * @returns 0 on success, <0 on error, 1 if protocol is unavailable.
  */