| // Copyright 2016 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_IMAGE_CAPTURE_IMAGE_CAPTURE_FRAME_GRABBER_H_ |
| #define CONTENT_RENDERER_IMAGE_CAPTURE_IMAGE_CAPTURE_FRAME_GRABBER_H_ |
| |
| #include <memory> |
| |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/threading/thread_checker.h" |
| #include "content/common/content_export.h" |
| #include "content/public/renderer/media_stream_video_sink.h" |
| #include "third_party/blink/public/platform/scoped_web_callbacks.h" |
| #include "third_party/blink/public/platform/web_image_capture_frame_grabber.h" |
| |
| namespace blink { |
| class WebMediaStreamTrack; |
| } |
| |
| namespace content { |
| |
| // This class grabs Video Frames from a given Media Stream Video Track, binding |
| // a method of an ephemeral SingleShotFrameHandler every time grabFrame() is |
| // called. This method receives an incoming media::VideoFrame on a background |
| // thread and converts it into the appropriate SkBitmap which is sent back to |
| // OnSkBitmap(). This class is single threaded throughout. |
| class CONTENT_EXPORT ImageCaptureFrameGrabber final |
| : public blink::WebImageCaptureFrameGrabber, |
| public MediaStreamVideoSink { |
| public: |
| using SkImageDeliverCB = base::Callback<void(sk_sp<SkImage>)>; |
| |
| ImageCaptureFrameGrabber(); |
| ~ImageCaptureFrameGrabber() override; |
| |
| // blink::WebImageCaptureFrameGrabber implementation. |
| void GrabFrame(blink::WebMediaStreamTrack* track, |
| std::unique_ptr<blink::WebImageCaptureGrabFrameCallbacks> |
| callbacks) override; |
| |
| private: |
| // Internal class to receive, convert and forward one frame. |
| class SingleShotFrameHandler; |
| |
| void OnSkImage(blink::ScopedWebCallbacks< |
| blink::WebImageCaptureGrabFrameCallbacks> callbacks, |
| sk_sp<SkImage> image); |
| |
| // Flag to indicate that there is a frame grabbing in progress. |
| bool frame_grab_in_progress_; |
| |
| base::ThreadChecker thread_checker_; |
| base::WeakPtrFactory<ImageCaptureFrameGrabber> weak_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ImageCaptureFrameGrabber); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_IMAGE_CAPTURE_IMAGE_CAPTURE_FRAME_GRABBER_H_ |