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// Copyright (c) 2012 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_RENDERER_MEDIA_RTC_VIDEO_CAPTURE_DELEGATE_H_
#define CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURE_DELEGATE_H_
#include "base/callback.h"
#include "base/message_loop_proxy.h"
#include "content/common/media/video_capture.h"
#include "content/renderer/media/video_capture_impl_manager.h"
#include "media/video/capture/video_capture.h"
namespace content {
// Implements a simple reference counted video capturer that guarantees that
// methods in RtcVideoCaptureDelegateEventHandler is only called from when
// StartCapture have been called until after StopCapture have been called.
// It uses VideoCaptureImplManager to start / stop and receive I420 frames
// from Chrome's video capture implementation.
class RtcVideoCaptureDelegate
: public base::RefCountedThreadSafe<RtcVideoCaptureDelegate>,
public media::VideoCapture::EventHandler {
public:
enum CaptureState {
CAPTURE_STOPPED, // The capturer has been stopped or hasn't started yet.
CAPTURE_RUNNING, // The capturer has been started successfully and is now
// capturing.
CAPTURE_FAILED, // The capturer failed to start.
};
typedef base::Callback<void(const media::VideoCapture::VideoFrameBuffer& buf)>
FrameCapturedCallback;
typedef base::Callback<void(CaptureState state)> StateChangeCallback;
RtcVideoCaptureDelegate(const media::VideoCaptureSessionId id,
VideoCaptureImplManager* vc_manager);
void StartCapture(const media::VideoCaptureCapability& capability,
const FrameCapturedCallback& captured_callback,
const StateChangeCallback& state_callback);
void StopCapture();
// media::VideoCapture::EventHandler implementation.
// These functions are called from a thread owned by |vc_manager_|.
virtual void OnStarted(media::VideoCapture* capture) OVERRIDE;
virtual void OnStopped(media::VideoCapture* capture) OVERRIDE;
virtual void OnPaused(media::VideoCapture* capture) OVERRIDE;
virtual void OnError(media::VideoCapture* capture, int error_code) OVERRIDE;
virtual void OnRemoved(media::VideoCapture* capture) OVERRIDE;
virtual void OnBufferReady(
media::VideoCapture* capture,
scoped_refptr<media::VideoCapture::VideoFrameBuffer> buf) OVERRIDE;
virtual void OnDeviceInfoReceived(
media::VideoCapture* capture,
const media::VideoCaptureParams& device_info) OVERRIDE;
private:
friend class base::RefCountedThreadSafe<RtcVideoCaptureDelegate>;
virtual ~RtcVideoCaptureDelegate();
void OnBufferReadyOnCaptureThread(
media::VideoCapture* capture,
scoped_refptr<media::VideoCapture::VideoFrameBuffer> buf);
void OnErrorOnCaptureThread(media::VideoCapture* capture);
void OnRemovedOnCaptureThread(media::VideoCapture* capture);
// The id identifies which video capture device is used for this video
// capture session.
media::VideoCaptureSessionId session_id_;
// The video capture manager handles open/close of video capture devices.
scoped_refptr<VideoCaptureImplManager> vc_manager_;
media::VideoCapture* capture_engine_;
// Accessed on the thread where StartCapture is called.
bool got_first_frame_;
bool error_occured_;
// |captured_callback_| is provided to this class in StartCapture and must be
// valid until StopCapture is called.
FrameCapturedCallback captured_callback_;
// |state_callback_| is provided to this class in StartCapture and must be
// valid until StopCapture is called.
StateChangeCallback state_callback_;
// Message loop of the caller of StartCapture.
scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_RTC_VIDEO_CAPTURE_DELEGATE_H_
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