From cb1fdc61047f1c25b7fd4e7113ba20ebfced1d2f Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Wed, 20 Nov 2002 14:54:13 +0000
Subject: [PATCH] match SDP based on content instead of extension

Originally committed as revision 1255 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libav/rtsp.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/libav/rtsp.c b/libav/rtsp.c
index ba87469d6..c173cb89b 100644
--- a/libav/rtsp.c
+++ b/libav/rtsp.c
@@ -984,12 +984,22 @@ static AVInputFormat rtsp_demux = {
     .flags = AVFMT_NOFILE,
 };
 
-
-/* XXX: add mime type support */
-static int sdp_probe(AVProbeData *p)
+static int sdp_probe(AVProbeData *p1)
 {
-    if (match_ext(p->filename, "sdp"))
-        return AVPROBE_SCORE_MAX;
+    const char *p;
+
+    /* we look for a line beginning "c=IN IP4" */
+    p = p1->buf;
+    while (*p != '\0') {
+        if (strstart(p, "c=IN IP4", NULL))
+            return AVPROBE_SCORE_MAX / 2;
+        p = strchr(p, '\n');
+        if (!p)
+            break;
+        p++;
+        if (*p == '\r')
+            p++;
+    }
     return 0;
 }
 
-- 
2.11.0