From 1973e1018e966d3f33cf3ed1e358b54344637945 Mon Sep 17 00:00:00 2001
From: Ramiro Polla <ramiro.polla@gmail.com>
Date: Sat, 23 Oct 2010 02:11:30 +0000
Subject: [PATCH] vfwcap: add option to print list of supported drivers

Originally committed as revision 25552 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavdevice/vfwcap.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/libavdevice/vfwcap.c b/libavdevice/vfwcap.c
index 13aaad92ef..7b54490fbb 100644
--- a/libavdevice/vfwcap.c
+++ b/libavdevice/vfwcap.c
@@ -248,6 +248,22 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     int height;
     int ret;
 
+    if (!strcmp(s->filename, "list")) {
+        for (devnum = 0; devnum <= 9; devnum++) {
+            char driver_name[256];
+            char driver_ver[256];
+            ret = capGetDriverDescription(devnum,
+                                          driver_name, sizeof(driver_name),
+                                          driver_ver, sizeof(driver_ver));
+            if (ret) {
+                av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
+                av_log(s, AV_LOG_INFO, " %s\n", driver_name);
+                av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
+            }
+        }
+        return AVERROR(EIO);
+    }
+
     if(!ap->time_base.den) {
         av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
         return AVERROR(EIO);