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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/common/content_export.h"
#include "content/renderer/media/video_capture_message_filter.h"
#include "media/video/capture/video_capture.h"
namespace base {
class MessageLoopProxy;
}
class CONTENT_EXPORT 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 void FeedBuffer(scoped_refptr<VideoFrameBuffer> buffer);
virtual bool CaptureStarted();
virtual int CaptureWidth();
virtual int CaptureHeight();
virtual int CaptureFrameRate();
// VideoCaptureMessageFilter::Delegate interface.
virtual void OnBufferCreated(base::SharedMemoryHandle handle,
int length, int buffer_id);
virtual void OnBufferReceived(int buffer_id, 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_params_.width > 0 && new_params_.height > 0);
}
private:
friend class VideoCaptureImplManager;
friend class VideoCaptureImplTest;
friend class MockVideoCaptureImpl;
struct DIBBuffer {
public:
DIBBuffer(base::SharedMemory* d,
media::VideoCapture::VideoFrameBuffer* ptr);
~DIBBuffer();
base::SharedMemory* dib;
scoped_refptr<media::VideoCapture::VideoFrameBuffer> mapped_memory;
};
VideoCaptureImpl(media::VideoCaptureSessionId id,
scoped_refptr<base::MessageLoopProxy> ml_proxy,
VideoCaptureMessageFilter* filter);
virtual ~VideoCaptureImpl();
void DoStartCapture(media::VideoCapture::EventHandler* handler,
const VideoCaptureCapability& capability);
void DoStopCapture(media::VideoCapture::EventHandler* handler);
void DoFeedBuffer(scoped_refptr<VideoFrameBuffer> buffer);
void DoBufferCreated(base::SharedMemoryHandle handle,
int length, int buffer_id);
void DoBufferReceived(int buffer_id, base::Time timestamp);
void DoStateChanged(const media::VideoCapture::State& state);
void DoDeviceInfoReceived(const media::VideoCaptureParams& device_info);
void DoDelegateAdded(int32 device_id);
void Init();
void DeInit(Task* task);
void StopDevice();
void RestartCapture();
void StartCaptureInternal();
void AddDelegateOnIOThread();
void RemoveDelegateOnIOThread(Task* task);
virtual void Send(IPC::Message* message);
scoped_refptr<VideoCaptureMessageFilter> message_filter_;
scoped_refptr<base::MessageLoopProxy> ml_proxy_;
int device_id_;
// Pool of DIBs.
typedef std::map<int, DIBBuffer*> CachedDIB;
CachedDIB cached_dibs_;
// DIBs at client side. The mapped value |int| means number of clients which
// hold this dib.
typedef std::map<media::VideoCapture::VideoFrameBuffer*, int> ClientSideDIB;
ClientSideDIB client_side_dibs_;
typedef std::map<media::VideoCapture::EventHandler*, VideoCaptureCapability>
ClientInfo;
ClientInfo clients_;
std::list<media::VideoCapture::EventHandler*> master_clients_;
ClientInfo pending_clients_;
media::VideoFrame::Format video_type_;
// The parameter is being used in current capture session. A capture session
// starts with StartCapture and ends with StopCapture.
media::VideoCaptureParams current_params_;
// The information about the device sent from browser process side.
media::VideoCaptureParams device_info_;
bool device_info_available_;
// The parameter will be used in next capture session.
media::VideoCaptureParams new_params_;
State state_;
DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
};
DISABLE_RUNNABLE_METHOD_REFCOUNT(VideoCaptureImpl);
#endif // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
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