CanvasCaptureMediaStreamTrack.h [plain text]
#pragma once
#if ENABLE(MEDIA_STREAM)
#include "HTMLCanvasElement.h"
#include "MediaStreamTrack.h"
#include "Timer.h"
#include <wtf/TypeCasts.h>
namespace WebCore {
class HTMLCanvasElement;
class Image;
class ScriptExecutionContext;
class CanvasCaptureMediaStreamTrack final : public MediaStreamTrack {
public:
static Ref<CanvasCaptureMediaStreamTrack> create(ScriptExecutionContext&, Ref<HTMLCanvasElement>&&, std::optional<double>&& frameRequestRate);
HTMLCanvasElement& canvas() { return m_canvas.get(); }
void requestFrame() { m_source->requestFrame(); }
private:
class Source final : public RealtimeMediaSource, private CanvasObserver {
public:
static Ref<Source> create(HTMLCanvasElement&, std::optional<double>&& frameRequestRate);
void requestFrame() { m_shouldEmitFrame = true; }
private:
Source(HTMLCanvasElement&, std::optional<double>&&);
void canvasChanged(HTMLCanvasElement&, const FloatRect&) final;
void canvasResized(HTMLCanvasElement&) final;
void canvasDestroyed(HTMLCanvasElement&) final;
void startProducingData() final;
void stopProducingData() final;
const RealtimeMediaSourceCapabilities& capabilities() const final { return RealtimeMediaSourceCapabilities::emptyCapabilities(); }
const RealtimeMediaSourceSettings& settings() const final { return m_settings; }
bool applySize(const IntSize&) final { return true; }
void captureCanvas();
void requestFrameTimerFired();
bool m_shouldEmitFrame { true };
std::optional<double> m_frameRequestRate;
Timer m_requestFrameTimer;
Timer m_canvasChangedTimer;
RealtimeMediaSourceSettings m_settings;
HTMLCanvasElement* m_canvas;
RefPtr<Image> m_currentImage;
};
CanvasCaptureMediaStreamTrack(ScriptExecutionContext&, Ref<HTMLCanvasElement>&&, Ref<Source>&&);
bool isCanvas() const final { return true; }
Ref<HTMLCanvasElement> m_canvas;
Ref<Source> m_source;
};
}
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::CanvasCaptureMediaStreamTrack)
static bool isType(const WebCore::MediaStreamTrack& track) { return track.isCanvas(); }
SPECIALIZE_TYPE_TRAITS_END()
#endif // ENABLE(MEDIA_STREAM)