v4l2 accelerators: use V4L2_CAP_VIDEO_M2M_MPLANE capability.

content/common/gpu/media/v4l2_slice_video_decode_accelerator.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/videodev2.h>
 #include <poll.h>
 #include <sys/eventfd.h>
 #include <sys/ioctl.h>
@@ skipping 467 matching lines @@
     return false;
   }
 
   if (!gfx::g_driver_egl.ext.b_EGL_KHR_fence_sync) {
     LOG(ERROR) << "Initialize(): context does not have EGL_KHR_fence_sync";
     return false;
   }
 
   // Capabilities check.
   struct v4l2_capability caps;
-  const __u32 kCapsRequired =
-      V4L2_CAP_VIDEO_CAPTURE_MPLANE |
-      V4L2_CAP_VIDEO_OUTPUT_MPLANE |
-      V4L2_CAP_STREAMING;
+  const __u32 kCapsRequired = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
   IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_QUERYCAP, &caps);
   if ((caps.capabilities & kCapsRequired) != kCapsRequired) {
-    DLOG(ERROR) << "Initialize(): ioctl() failed: VIDIOC_QUERYCAP"
-                   ", caps check failed: 0x" << std::hex << caps.capabilities;
+    LOG(ERROR) << "Initialize(): ioctl() failed: VIDIOC_QUERYCAP"

[wuchengli, 2015/12/29 09:43:32]

I don't know why this used to be DLOG. All other three files are LOG(ERROR).

+                  ", caps check failed: 0x" << std::hex << caps.capabilities;
     return false;
   }
 
   if (!SetupFormats())
     return false;
 
   if (!decoder_thread_.Start()) {
     DLOG(ERROR) << "Initialize(): device thread failed to start";
     return false;
   }
@@ skipping 2037 matching lines @@
   if (!device)
     return SupportedProfiles();
 
   const uint32_t supported_formats[] = {
       V4L2_PIX_FMT_H264_SLICE, V4L2_PIX_FMT_VP8_FRAME};
   return device->GetSupportedDecodeProfiles(arraysize(supported_formats),
                                             supported_formats);
 }
 
 }  // namespace content