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/*
* Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MEDIA_ENGINE_WEBRTCVIDEOCAPTURER_H_
#define MEDIA_ENGINE_WEBRTCVIDEOCAPTURER_H_
#include <memory>
#include <string>
#include <vector>
#include "common_video/libyuv/include/webrtc_libyuv.h"
#include "media/base/device.h"
#include "media/base/videocapturer.h"
#include "modules/video_capture/video_capture.h"
#include "rtc_base/asyncinvoker.h"
#include "rtc_base/messagehandler.h"
#include "rtc_base/scoped_ref_ptr.h"
namespace cricket {
// Factory to allow injection of a VCM impl into WebRtcVideoCapturer.
// DeviceInfos do not have a Release() and therefore need an explicit Destroy().
class WebRtcVcmFactoryInterface {
public:
virtual ~WebRtcVcmFactoryInterface() {}
virtual rtc::scoped_refptr<webrtc::VideoCaptureModule> Create(
const char* device) = 0;
virtual webrtc::VideoCaptureModule::DeviceInfo* CreateDeviceInfo() = 0;
virtual void DestroyDeviceInfo(
webrtc::VideoCaptureModule::DeviceInfo* info) = 0;
};
// WebRTC-based implementation of VideoCapturer.
class WebRtcVideoCapturer : public VideoCapturer,
public rtc::VideoSinkInterface<webrtc::VideoFrame> {
public:
WebRtcVideoCapturer();
explicit WebRtcVideoCapturer(WebRtcVcmFactoryInterface* factory);
virtual ~WebRtcVideoCapturer();
bool Init(const Device& device);
bool Init(const rtc::scoped_refptr<webrtc::VideoCaptureModule>& module);
// Override virtual methods of the parent class VideoCapturer.
bool GetBestCaptureFormat(const VideoFormat& desired,
VideoFormat* best_format) override;
CaptureState Start(const VideoFormat& capture_format) override;
void Stop() override;
bool IsRunning() override;
bool IsScreencast() const override { return false; }
protected:
void OnSinkWantsChanged(const rtc::VideoSinkWants& wants) override;
// Override virtual methods of the parent class VideoCapturer.
bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
private:
// Callback when a frame is captured by camera.
void OnFrame(const webrtc::VideoFrame& frame) override;
// Used to signal captured frames on the same thread as invoked Start().
// With WebRTC's current VideoCapturer implementations, this will mean a
// thread hop, but in other implementations (e.g. Chrome) it will be called
// directly from OnIncomingCapturedFrame.
// TODO(tommi): Remove this workaround when we've updated the WebRTC capturers
// to follow the same contract.
void SignalFrameCapturedOnStartThread(const webrtc::VideoFrame& frame);
std::unique_ptr<WebRtcVcmFactoryInterface> factory_;
rtc::scoped_refptr<webrtc::VideoCaptureModule> module_;
int captured_frames_;
std::vector<uint8_t> capture_buffer_;
rtc::Thread* start_thread_; // Set in Start(), unset in Stop();
};
} // namespace cricket
#endif // MEDIA_ENGINE_WEBRTCVIDEOCAPTURER_H_
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