From c16601bb8eacd26e1cc5b32ed751efce266ab335 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Sun, 26 Feb 2006 13:22:32 +0000
Subject: [PATCH] print a hint when trying V4L2 on V4L device

Originally committed as revision 5065 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/v4l2.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libavformat/v4l2.c b/libavformat/v4l2.c
index 78a0cac52d..4cdfc26e5e 100644
--- a/libavformat/v4l2.c
+++ b/libavformat/v4l2.c
@@ -122,6 +122,13 @@ static int device_open(const char *devname, uint32_t *capabilities)
     }
 
     res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
+    // ENOIOCTLCMD definition only availble on __KERNEL__
+    if (res < 0 && errno == 515)
+    {
+        av_log(NULL, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
+
+        return -1;
+    }
     if (res < 0) {
         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
                  strerror(errno));