Linux Video Capture: Add V4L2VideoCaptureDelegate{Single,Multi}Plane.

media/video/capture/linux/v4l2_capture_delegate_multi_plane.h

+// 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.
+
+#ifndef MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_MULTI_PLANE_H_
+#define MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_MULTI_PLANE_H_
+
+#include "base/memory/ref_counted.h"
+#include "media/video/capture/linux/v4l2_video_capture_delegate.h"
+
+#if defined(OS_OPENBSD)
+#error "OpenBSD does not support MPlane capture API."
+#endif
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace media {
+
+// V4L2 specifics for MPLANE API.
+class V4L2CaptureDelegateMultiPlane final : public V4L2VideoCaptureDelegate {
+ public:
+  V4L2CaptureDelegateMultiPlane(
+      const VideoCaptureDevice::Name& device_name,
+      const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
+      int power_line_frequency);
+
+ private:
+  // BufferTracker derivation to implement construction semantics for MPLANE.
+  class BufferTrackerMPlane final : public BufferTracker {
+   public:
+    bool Init(int fd, const v4l2_buffer& buffer) override;
+
+   private:
+    ~BufferTrackerMPlane() override {}
+  };
+
+  ~V4L2CaptureDelegateMultiPlane() override;
+
+  // V4L2VideoCaptureDelegate virtual methods implementation.
+  scoped_refptr<BufferTracker> CreateBufferTracker() override;

[magjed_chromium, 2015/03/19 18:13:29]

Shouldn't this be a static function?

[mcasas, 2015/03/19 22:57:00]

I would like to but they I could not override it.

+  bool FillV4L2Format(v4l2_format* format,
+                      uint32_t width,
+                      uint32_t height,
+                      uint32_t pixelformat_fourcc) override;
+  void FinishFillingV4L2Buffer(v4l2_buffer* buffer) const override;
+  void SendBuffer(const scoped_refptr<BufferTracker>& buffer_tracker) override;

[Pawel Osciak, 2015/03/19 07:52:43]

Can this be const?

[mcasas, 2015/03/19 22:57:00]

Done.

+
+  // Vector to allocate and track as many v4l2_plane structs as planes, needed
+  // for v4l2_buffer.m.planes.
+  std::vector<struct v4l2_plane> v4l2_planes_;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_SINGLE_PLANE_H_