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// Copyright 2015 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_HTML_VIDEO_ELEMENT_CAPTURER_SOURCE_H_
#define CONTENT_RENDERER_MEDIA_HTML_VIDEO_ELEMENT_CAPTURER_SOURCE_H_
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "media/base/video_capturer_source.h"
#include "media/base/video_frame_pool.h"
#include "media/base/video_types.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/platform/WebSize.h"
namespace blink {
class WebMediaPlayer;
} // namespace blink
namespace content {
// This class is a VideoCapturerSource taking video snapshots of the ctor-passed
// blink::WebMediaPlayer on Render Main thread. The captured data is converted
// and sent back to |io_task_runner_| via the registered |new_frame_callback_|.
class CONTENT_EXPORT HtmlVideoElementCapturerSource final
: public media::VideoCapturerSource {
public:
static scoped_ptr<HtmlVideoElementCapturerSource>
CreateFromWebMediaPlayerImpl(
blink::WebMediaPlayer* player,
const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
HtmlVideoElementCapturerSource(
const base::WeakPtr<blink::WebMediaPlayer>& player,
const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
~HtmlVideoElementCapturerSource() override;
// media::VideoCapturerSource Implementation.
void GetCurrentSupportedFormats(
int max_requested_width,
int max_requested_height,
double max_requested_frame_rate,
const VideoCaptureDeviceFormatsCB& callback) override;
void StartCapture(const media::VideoCaptureParams& params,
const VideoCaptureDeliverFrameCB& new_frame_callback,
const RunningCallback& running_callback) override;
void StopCapture() override;
private:
// This method includes collecting data from the WebMediaPlayer and converting
// it into a format suitable for MediaStreams.
void sendNewFrame();
media::VideoFramePool frame_pool_;
scoped_ptr<SkCanvas> canvas_;
const base::WeakPtr<blink::WebMediaPlayer> web_media_player_;
const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
// These three configuration items are passed on StartCapture();
RunningCallback running_callback_;
VideoCaptureDeliverFrameCB new_frame_callback_;
double capture_frame_rate_;
// Target time for the next frame.
base::TimeTicks next_capture_time_;
// Bound to the main render thread.
base::ThreadChecker thread_checker_;
// Used on main render thread to schedule future capture events.
base::WeakPtrFactory<HtmlVideoElementCapturerSource> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(HtmlVideoElementCapturerSource);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_HTML_VIDEO_ELEMENT_CAPTURER_SOURCE_H_
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