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// Copyright (c) 2011 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.
// VideoCaptureImpl represents a capture device in renderer process. It provides
// interfaces for clients to Start/Stop capture. It also communicates to clients
// when buffer is ready, state of capture device is changed.
#ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
#define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
#include <list>
#include <map>
#include "content/renderer/video_capture_message_filter.h"
#include "media/base/callback.h"
#include "media/video/capture/video_capture.h"
#include "ui/gfx/surface/transport_dib.h"
namespace base {
class MessageLoopProxy;
}
class VideoCaptureImpl
: public media::VideoCapture,
public VideoCaptureMessageFilter::Delegate {
public:
// media::VideoCapture interface.
virtual void StartCapture(media::VideoCapture::EventHandler* handler,
const VideoCaptureCapability& capability);
virtual void StopCapture(media::VideoCapture::EventHandler* handler);
virtual bool CaptureStarted();
virtual int CaptureWidth();
virtual int CaptureHeight();
virtual int CaptureFrameRate();
// VideoCaptureMessageFilter::Delegate interface.
virtual void OnBufferReceived(TransportDIB::Handle handle,
base::Time timestamp);
virtual void OnStateChanged(const media::VideoCapture::State& state);
virtual void OnDeviceInfoReceived(
const media::VideoCaptureParams& device_info);
virtual void OnDelegateAdded(int32 device_id);
bool pending_start() {
return (new_width_ > 0 && new_height_ > 0);
}
private:
friend class VideoCaptureImplManager;
friend class VideoCaptureImplTest;
enum State {
kStarted,
kStopping,
kStopped
};
struct DIBBuffer {
public:
DIBBuffer(TransportDIB* d, media::VideoCapture::VideoFrameBuffer* ptr);
~DIBBuffer();
TransportDIB* dib;
scoped_refptr<media::VideoCapture::VideoFrameBuffer> mapped_memory;
};
VideoCaptureImpl(media::VideoCaptureSessionId id,
scoped_refptr<base::MessageLoopProxy> ml_proxy,
VideoCaptureMessageFilter* filter);
virtual ~VideoCaptureImpl();
void Init();
void DeInit(Task* task);
void StopDevice();
void RestartCapture();
void StartCaptureInternal();
void AddDelegateOnIOThread();
void RemoveDelegateOnIOThread(Task* task);
scoped_refptr<VideoCaptureMessageFilter> message_filter_;
media::VideoCaptureSessionId session_id_;
scoped_refptr<base::MessageLoopProxy> ml_proxy_;
int device_id_;
// Pool of DIBs.
typedef std::list<DIBBuffer*> CachedDIB;
CachedDIB cached_dibs_;
typedef std::map<media::VideoCapture::EventHandler*, VideoCaptureCapability>
ClientInfo;
ClientInfo clients_;
std::list<media::VideoCapture::EventHandler*> master_clients_;
ClientInfo pending_clients_;
int width_;
int height_;
int frame_rate_;
media::VideoFrame::Format video_type_;
int new_width_;
int new_height_;
State state_;
DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
};
DISABLE_RUNNABLE_METHOD_REFCOUNT(VideoCaptureImpl);
#endif // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
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