media/capture/video/linux/v4l2_capture_delegate_multi_plane.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_MULTI_PLANE_H_
   6 #define MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_MULTI_PLANE_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "media/capture/video/linux/v4l2_capture_delegate.h"
  10
  11 #if defined(OS_OPENBSD)
  12 #error "OpenBSD does not support MPlane capture API."
  13 #endif
  14
  15 namespace base {
  16 class SingleThreadTaskRunner;
  17 }  // namespace base
  18
  19 namespace media {
  20
  21 // V4L2 specifics for MPLANE API.
  22 class V4L2CaptureDelegateMultiPlane final : public V4L2CaptureDelegate {
  23  public:
  24   V4L2CaptureDelegateMultiPlane(
  25       const VideoCaptureDevice::Name& device_name,
  26       const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
  27       int power_line_frequency);
  28
  29  private:
  30   // BufferTracker derivation to implement construction semantics for MPLANE.
  31   class BufferTrackerMPlane final : public BufferTracker {
  32    public:
  33     bool Init(int fd, const v4l2_buffer& buffer) override;
  34
  35    private:
  36     ~BufferTrackerMPlane() override {}
  37   };
  38
  39   ~V4L2CaptureDelegateMultiPlane() override;
  40
  41   // V4L2CaptureDelegate virtual methods implementation.
  42   scoped_refptr<BufferTracker> CreateBufferTracker() const override;
  43   bool FillV4L2Format(v4l2_format* format,
  44                       uint32_t width,
  45                       uint32_t height,
  46                       uint32_t pixelformat_fourcc) const override;
  47   void FinishFillingV4L2Buffer(v4l2_buffer* buffer) const override;
  48   void SetPayloadSize(const scoped_refptr<BufferTracker>& buffer_tracker,
  49                       const v4l2_buffer& buffer) const override;
  50   void SendBuffer(const scoped_refptr<BufferTracker>& buffer_tracker,
  51                   const v4l2_format& format) const override;
  52
  53   // Vector to allocate and track as many v4l2_plane structs as planes, needed
  54   // for v4l2_buffer.m.planes. This is a scratchpad marked mutable to enable
  55   // using it in otherwise const methods.
  56   mutable std::vector<struct v4l2_plane> v4l2_planes_;
  57 };
  58
  59 }  // namespace media
  60
  61 #endif  // MEDIA_VIDEO_CAPTURE_LINUX_V4L2_CAPTURE_DELEGATE_SINGLE_PLANE_H_