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// 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
#include "media/video/capture/video_capture_device.h"
namespace content {
class VideoCaptureBufferPool;
class VideoCaptureController;
// Receives events from the VideoCaptureDevice and posts them to a |controller_|
// on the IO thread. An instance of this class may safely outlive its target
// VideoCaptureController. This is a shallow class meant to convert incoming
// frames and holds no significant state.
//
// Methods of this class may be called from any thread, and in practice will
// often be called on some auxiliary thread depending on the platform and the
// device type; including, for example, the DirectShow thread on Windows, the
// v4l2_thread on Linux, and the UI thread for tab capture.
//
// It has an internal ref counted TextureWrapHelper class used to wrap incoming
// GpuMemoryBuffers into Texture backed VideoFrames. This class creates and
// manages the necessary entities to interact with the GPU process, notably an
// offscreen Context to avoid janking the UI thread.
class CONTENT_EXPORT VideoCaptureDeviceClient
: public media::VideoCaptureDevice::Client {
public:
VideoCaptureDeviceClient(
const base::WeakPtr<VideoCaptureController>& controller,
const scoped_refptr<VideoCaptureBufferPool>& buffer_pool,
const scoped_refptr<base::SingleThreadTaskRunner>& capture_task_runner);
~VideoCaptureDeviceClient() override;
// VideoCaptureDevice::Client implementation.
void OnIncomingCapturedData(const uint8* data,
int length,
const media::VideoCaptureFormat& frame_format,
int rotation,
const base::TimeTicks& timestamp) override;
void OnIncomingCapturedYuvData(const uint8* y_data,
const uint8* u_data,
const uint8* v_data,
size_t y_stride,
size_t u_stride,
size_t v_stride,
const media::VideoCaptureFormat& frame_format,
int clockwise_rotation,
const base::TimeTicks& timestamp) override;
scoped_ptr<Buffer> ReserveOutputBuffer(media::VideoPixelFormat format,
const gfx::Size& dimensions) override;
void OnIncomingCapturedBuffer(scoped_ptr<Buffer> buffer,
const media::VideoCaptureFormat& frame_format,
const base::TimeTicks& timestamp) override;
void OnIncomingCapturedVideoFrame(
scoped_ptr<Buffer> buffer,
const scoped_refptr<media::VideoFrame>& frame,
const base::TimeTicks& timestamp) override;
void OnError(const std::string& reason) override;
void OnLog(const std::string& message) override;
private:
// The controller to which we post events.
const base::WeakPtr<VideoCaptureController> controller_;
// The pool of shared-memory buffers used for capturing.
const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
// Internal delegate for GpuMemoryBuffer-into-VideoFrame wrapping.
class TextureWrapHelper;
scoped_refptr<TextureWrapHelper> texture_wrap_helper_;
// Reference to Capture Thread task runner, where |texture_wrap_helper_|
// lives.
const scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
media::VideoPixelFormat last_captured_pixel_format_;
DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceClient);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
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