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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_WEBCODECS_LOGGER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_WEBCODECS_LOGGER_H_
#include "base/memory/scoped_refptr.h"
#include "base/time/time.h"
#include "media/base/video_frame.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/supplementable.h"
#include "third_party/blink/renderer/platform/timer.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
namespace blink {
// This class is used to distribute a VideoFrameCloseAuditor flag to
// VideoFrameHandles. If a handle's destructor is run without having received a
// call to Invalidate(), it will set |close_auditor_|. The WebCodecsLogger
// periodically checks whether or not the flag is set, and outputs an error
// message to the JS console, reminding developers to call close() on their
// VideoFrames.
//
// This class lets us avoid making VideoFrames ExecutionLifeCycleObservers,
// which could add 1000s of observers per second. It also avoids the use of
// a pre-finzalizer on VideoFrames, which could have a GC performance impact.
class MODULES_EXPORT WebCodecsLogger : public GarbageCollected<WebCodecsLogger>,
public Supplement<ExecutionContext> {
public:
// Class that reports when blink::VideoFrames have been garbage collected
// without having close() called on them. This is a web page application
// error which can cause a web page to stall.
class VideoFrameCloseAuditor
: public WTF::ThreadSafeRefCounted<VideoFrameCloseAuditor> {
public:
void ReportUnclosedFrame();
void Clear();
bool were_frames_not_closed() { return were_frames_not_closed_; }
private:
friend class WTF::ThreadSafeRefCounted<VideoFrameCloseAuditor>;
~VideoFrameCloseAuditor() = default;
bool were_frames_not_closed_ = false;
};
static const char kSupplementName[];
static WebCodecsLogger& From(ExecutionContext&);
explicit WebCodecsLogger(ExecutionContext&);
virtual ~WebCodecsLogger() = default;
// Disallow copy and assign.
WebCodecsLogger& operator=(const WebCodecsLogger&) = delete;
WebCodecsLogger(const WebCodecsLogger&) = delete;
// Returns |close_auditor_| and starts |timer_| if needed.
scoped_refptr<VideoFrameCloseAuditor> GetCloseAuditor();
void Trace(Visitor*) const override;
private:
void LogCloseErrors(TimerBase*);
base::TimeTicks last_auditor_access_;
scoped_refptr<VideoFrameCloseAuditor> close_auditor_;
HeapTaskRunnerTimer<WebCodecsLogger> timer_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_WEBCODECS_LOGGER_H_
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