Fix Linux kernel lacking V4L2_CID_POWER_LINE_FREQUENCY_AUTO

Fix compilation with older Linux kernel's (e.g. Red Hat 6.6).
The enum was introduced in Linux kernel version 3.2 (kernel commit
d26a6635b2421).

Task-number: QTBUG-48298
Task-number: QTBUG-57014
Change-Id: I05b86520fc162d55d043d70d1b92aea5f7a61bc5
Reviewed-by: Kai Koehne <kai.koehne@qt.io>

2 files changed, 15 insertions, 3 deletions

diff --git a/chromium/media/capture/video/linux/v4l2_capture_delegate.cc b/chromium/media/capture/video/linux/v4l2_capture_delegate.cc
index 118d9976ea5..be27a97586a 100644
--- a/chromium/media/capture/video/linux/v4l2_capture_delegate.cc
+++ b/chromium/media/capture/video/linux/v4l2_capture_delegate.cc
@@ -12,6 +12,10 @@
 #include <sys/mman.h>
 #include <utility>
 
+#if !defined(OS_OPENBSD)
+#include <linux/version.h>
+#endif
+
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/posix/eintr_wrapper.h"
@@ -468,9 +472,12 @@ void V4L2CaptureDelegate::AllocateAndStart(
 
   // Set anti-banding/anti-flicker to 50/60Hz. May fail due to not supported
   // operation (|errno| == EINVAL in this case) or plain failure.
-  if ((power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_50HZ) ||
-      (power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_60HZ) ||
-      (power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_AUTO)) {
+  if ((power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_50HZ)
+      || (power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_60HZ)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)
+      || (power_line_frequency_ == V4L2_CID_POWER_LINE_FREQUENCY_AUTO)
+#endif
+    ) {
     struct v4l2_control control = {};
     control.id = V4L2_CID_POWER_LINE_FREQUENCY;
     control.value = power_line_frequency_;
diff --git a/chromium/media/capture/video/linux/video_capture_device_linux.cc b/chromium/media/capture/video/linux/video_capture_device_linux.cc
index ff0402bfa12..4b3e8bcbae1 100644
--- a/chromium/media/capture/video/linux/video_capture_device_linux.cc
+++ b/chromium/media/capture/video/linux/video_capture_device_linux.cc
@@ -17,6 +17,7 @@
 #include <sys/videoio.h>
 #else
 #include <linux/videodev2.h>
+#include <linux/version.h>
 #endif
 
 namespace media {
@@ -145,8 +146,12 @@ int VideoCaptureDeviceLinux::TranslatePowerLineFrequencyToV4L2(
     case media::PowerLineFrequency::FREQUENCY_60HZ:
       return V4L2_CID_POWER_LINE_FREQUENCY_60HZ;
     default:
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)
       // If we have no idea of the frequency, at least try and set it to AUTO.
       return V4L2_CID_POWER_LINE_FREQUENCY_AUTO;
+#else
+      return V4L2_CID_POWER_LINE_FREQUENCY_60HZ;
+#endif
   }
 }