v4l2 accelerators: use V4L2_CAP_VIDEO_M2M_MPLANE capability.

content/common/gpu/media/v4l2_video_decode_accelerator.cc

 // Copyright 2014 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 <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/videodev2.h>
 #include <poll.h>
 #include <sys/eventfd.h>
@@ skipping 238 matching lines @@
 // TODO(posciak): crbug.com/450898.
 #if defined(ARCH_CPU_ARMEL)
   if (!gfx::g_driver_egl.ext.b_EGL_KHR_fence_sync) {
     LOG(ERROR) << "Initialize(): context does not have EGL_KHR_fence_sync";
     return false;
   }
 #endif
 
   // 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) {
-    LOG(ERROR) << "Initialize(): ioctl() failed: VIDIOC_QUERYCAP"
-        ", caps check failed: 0x" << std::hex << caps.capabilities;
-    return false;
+    const __u32 kCapsRequiredCompat = V4L2_CAP_VIDEO_CAPTURE_MPLANE |

[Pawel Osciak, 2015/12/29 10:07:47]

Please add a short comment here and in VEA that this cap combination is
deprecated, but some older drivers may still be returning it.

[wuchengli, 2015/12/29 11:28:07]

Done.

+                                      V4L2_CAP_VIDEO_OUTPUT_MPLANE |
+                                      V4L2_CAP_STREAMING;
+    if ((caps.capabilities & kCapsRequiredCompat) != kCapsRequiredCompat) {
+      LOG(ERROR) << "Initialize(): ioctl() failed: VIDIOC_QUERYCAP"
+          ", caps check failed: 0x" << std::hex << caps.capabilities;
+      return false;
+    }
   }
 
   if (!SetupFormats())
     return false;
 
   // Subscribe to the resolution change event.
   struct v4l2_event_subscription sub;
   memset(&sub, 0, sizeof(sub));
   sub.type = V4L2_EVENT_SOURCE_CHANGE;
   IOCTL_OR_ERROR_RETURN_FALSE(VIDIOC_SUBSCRIBE_EVENT, &sub);
@@ skipping 1766 matching lines @@
 
 void V4L2VideoDecodeAccelerator::PictureCleared() {
   DVLOG(3) << "PictureCleared(). clearing count=" << picture_clearing_count_;
   DCHECK_EQ(decoder_thread_.message_loop(), base::MessageLoop::current());
   DCHECK_GT(picture_clearing_count_, 0);
   picture_clearing_count_--;
   SendPictureReady();
 }
 
 }  // namespace content