v4l2 accelerators: use V4L2_CAP_VIDEO_M2M_MPLANE capability.

content/common/gpu/media/v4l2_video_encode_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 <fcntl.h>
 #include <linux/videodev2.h>
 #include <poll.h>
 #include <sys/eventfd.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
@@ skipping 102 matching lines @@
   visible_size_ = input_visible_size;
 
   client_ptr_factory_.reset(new base::WeakPtrFactory<Client>(client));
   client_ = client_ptr_factory_->GetWeakPtr();
 
   DCHECK(child_task_runner_->BelongsToCurrentThread());
   DCHECK_EQ(encoder_state_, kUninitialized);
 
   struct v4l2_capability caps;
   memset(&caps, 0, sizeof(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;
+    // This cap combination is deprecated, but some older drivers may still be
+    // returning it.
+    const __u32 kCapsRequiredCompat = V4L2_CAP_VIDEO_CAPTURE_MPLANE |
+                                      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 (!SetFormats(input_format, output_profile)) {
     LOG(ERROR) << "Failed setting up formats";
     return false;
   }
 
   if (input_format != device_input_format_) {
     DVLOG(1) << "Input format not supported by the HW, will convert to "
              << media::VideoPixelFormatToString(device_input_format_);
@@ skipping 1017 matching lines @@
   reqbufs.count = 0;
   reqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
   reqbufs.memory = V4L2_MEMORY_MMAP;
   IOCTL_OR_LOG_ERROR(VIDIOC_REQBUFS, &reqbufs);
 
   output_buffer_map_.clear();
   free_output_buffers_.clear();
 }
 
 }  // namespace content