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// Copyright 2014 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_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
#define CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_
#include <stdint.h>
#include <vector>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "content/common/content_export.h"
#include "media/base/video_frame.h"
#include "media/base/video_frame_pool.h"
#include "media/capture/video_capture_types.h"
#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
#include "third_party/webrtc/media/base/videocapturer.h"
namespace content {
// WebRtcVideoCapturerAdapter implements a simple cricket::VideoCapturer that is
// used for VideoCapturing in libJingle and especially in PeerConnections.
// The class is created and destroyed on the main render thread.
// PeerConnection access cricket::VideoCapturer from a libJingle worker thread.
// An instance of WebRtcVideoCapturerAdapter is owned by an instance of
// webrtc::VideoTrackSourceInterface in libJingle. The implementation of
// webrtc::VideoTrackSourceInterface guarantees that this object is not deleted
// while it is still used in libJingle.
class CONTENT_EXPORT WebRtcVideoCapturerAdapter
: public cricket::VideoCapturer {
public:
WebRtcVideoCapturerAdapter(
bool is_screencast,
blink::WebMediaStreamTrack::ContentHintType content_hint);
~WebRtcVideoCapturerAdapter() override;
// OnFrameCaptured delivers video frames to libjingle. It must be called on
// libjingles worker thread.
// This method is virtual for testing purposes.
virtual void OnFrameCaptured(const scoped_refptr<media::VideoFrame>& frame);
void SetContentHint(blink::WebMediaStreamTrack::ContentHintType content_hint);
private:
// cricket::VideoCapturer implementation.
// These methods are accessed from a libJingle worker thread.
cricket::CaptureState Start(
const cricket::VideoFormat& capture_format) override;
void Stop() override;
bool IsRunning() override;
bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
cricket::VideoFormat* best_format) override;
bool IsScreencast() const override;
bool ShouldAdaptResolution() const;
// |thread_checker_| is bound to the libjingle worker thread.
base::ThreadChecker thread_checker_;
const bool is_screencast_;
blink::WebMediaStreamTrack::ContentHintType content_hint_;
bool running_;
media::VideoFramePool scaled_frame_pool_;
DISALLOW_COPY_AND_ASSIGN(WebRtcVideoCapturerAdapter);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_WEBRTC_WEBRTC_VIDEO_CAPTURER_ADAPTER_H_