From 7274a48035f9b97c2d8bae202ac6688dca81ff10 Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date: Fri, 26 Dec 2008 10:12:57 +0000
Subject: [PATCH] Check that the device is a capture device immediately after
 opening the device.

Originally committed as revision 16318 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavdevice/v4l.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/libavdevice/v4l.c b/libavdevice/v4l.c
index 2b0ce0c7c7..4a5328ade4 100644
--- a/libavdevice/v4l.c
+++ b/libavdevice/v4l.c
@@ -103,14 +103,6 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         goto fail;
     }
 
-    /* no values set, autodetect them */
-    if (s->video_win.width <= 0 || s->video_win.height <= 0) {
-        if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
-            av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
-            goto fail;
-        }
-    }
-
     if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
         av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
         goto fail;
@@ -121,6 +113,14 @@ static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
         goto fail;
     }
 
+    /* no values set, autodetect them */
+    if (s->video_win.width <= 0 || s->video_win.height <= 0) {
+        if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
+            av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
+            goto fail;
+        }
+    }
+
     desired_palette = -1;
     desired_depth = -1;
     for (j = 0; j < vformat_num; j++) {