content/browser/renderer_host/media/video_capture_device_client.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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "content/common/content_export.h"
  12 #include "media/video/capture/video_capture_device.h"
  13
  14 namespace content {
  15 class VideoCaptureBufferPool;
  16 class VideoCaptureController;
  17
  18 // Receives events from the VideoCaptureDevice and posts them to a |controller_|
  19 // on the IO thread. An instance of this class may safely outlive its target
  20 // VideoCaptureController. This is a shallow class meant to convert incoming
  21 // frames and holds no significant state.
  22 //
  23 // Methods of this class may be called from any thread, and in practice will
  24 // often be called on some auxiliary thread depending on the platform and the
  25 // device type; including, for example, the DirectShow thread on Windows, the
  26 // v4l2_thread on Linux, and the UI thread for tab capture.
  27 class CONTENT_EXPORT VideoCaptureDeviceClient
  28     : public media::VideoCaptureDevice::Client {
  29  public:
  30   VideoCaptureDeviceClient(
  31       const base::WeakPtr<VideoCaptureController>& controller,
  32       const scoped_refptr<VideoCaptureBufferPool>& buffer_pool);
  33   ~VideoCaptureDeviceClient() override;
  34
  35   // VideoCaptureDevice::Client implementation.
  36   void OnIncomingCapturedData(const uint8* data,
  37                               int length,
  38                               const media::VideoCaptureFormat& frame_format,
  39                               int rotation,
  40                               const base::TimeTicks& timestamp) override;
  41   void OnIncomingCapturedYuvData(const uint8* y_data,
  42                                  const uint8* u_data,
  43                                  const uint8* v_data,
  44                                  size_t y_stride,
  45                                  size_t u_stride,
  46                                  size_t v_stride,
  47                                  const media::VideoCaptureFormat& frame_format,
  48                                  int clockwise_rotation,
  49                                  const base::TimeTicks& timestamp) override;
  50   scoped_refptr<Buffer> ReserveOutputBuffer(media::VideoFrame::Format format,
  51                                             const gfx::Size& size) override;
  52   void OnIncomingCapturedVideoFrame(
  53       const scoped_refptr<Buffer>& buffer,
  54       const scoped_refptr<media::VideoFrame>& frame,
  55       const base::TimeTicks& timestamp) override;
  56   void OnError(const std::string& reason) override;
  57   void OnLog(const std::string& message) override;
  58
  59  private:
  60   // The controller to which we post events.
  61   const base::WeakPtr<VideoCaptureController> controller_;
  62
  63   // The pool of shared-memory buffers used for capturing.
  64   const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
  65
  66   media::VideoPixelFormat last_captured_pixel_format_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceClient);
  69 };
  70
  71
  72 }  // namespace content
  73
  74 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_