/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim:set ts=2 sw=2 sts=2 et cindent: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #if !defined(FuzzingWrapper_h_) #define FuzzingWrapper_h_ #include "mozilla/Pair.h" #include "PlatformDecoderModule.h" #include <deque> namespace mozilla { // Fuzzing wrapper for media decoders. // // DecoderFuzzingWrapper owns the DecoderCallbackFuzzingWrapper, and inserts // itself between the reader and the decoder. // DecoderCallbackFuzzingWrapper inserts itself between a decoder and its // callback. // Together they are used to introduce some fuzzing, (e.g. delay output). // // Normally: // ====================================> // reader decoder // <------------------------------------ // // With fuzzing: // ======> DecoderFuzzingWrapper ======> // reader v decoder // <-- DecoderCallbackFuzzingWrapper <-- // // Creation order should be: // 1. Create DecoderCallbackFuzzingWrapper, give the expected callback target. // 2. Create actual decoder, give DecoderCallbackFuzzingWrapper as callback. // 3. Create DecoderFuzzingWrapper, give decoder and DecoderCallbackFuzzingWrapper. // DecoderFuzzingWrapper is what the reader sees as decoder, it owns the // real decoder and the DecoderCallbackFuzzingWrapper. class DecoderCallbackFuzzingWrapper : public MediaDataDecoderCallback { public: NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DecoderCallbackFuzzingWrapper) explicit DecoderCallbackFuzzingWrapper(MediaDataDecoderCallback* aCallback); // Enforce a minimum interval between output frames (i.e., limit frame rate). // Of course, if the decoder is even slower, this won't have any effect. void SetVideoOutputMinimumInterval(TimeDuration aFrameOutputMinimumInterval); // If false (default), if frames are delayed, any InputExhausted is delayed to // be later sent after the corresponding delayed frame. // If true, InputExhausted are passed through immediately; This could result // in lots of frames being decoded and queued for delayed output! void SetDontDelayInputExhausted(bool aDontDelayInputExhausted); private: virtual ~DecoderCallbackFuzzingWrapper(); // MediaDataDecoderCallback implementation. void Output(MediaData* aData) override; void Error(const MediaResult& aError) override; void InputExhausted() override; void DrainComplete() override; void ReleaseMediaResources() override; bool OnReaderTaskQueue() override; MediaDataDecoderCallback* mCallback; // Settings for minimum frame output interval & InputExhausted, // should be set during init and then only read on mTaskQueue. TimeDuration mFrameOutputMinimumInterval; bool mDontDelayInputExhausted; // Members for minimum frame output interval & InputExhausted, // should only be accessed on mTaskQueue. TimeStamp mPreviousOutput; // First member is the frame to be delayed. // Second member is true if an 'InputExhausted' arrived after that frame; in // which case an InputExhausted will be sent after finally outputting the frame. typedef Pair<RefPtr<MediaData>, bool> MediaDataAndInputExhausted; std::deque<MediaDataAndInputExhausted> mDelayedOutput; RefPtr<MediaTimer> mDelayedOutputTimer; MozPromiseRequestHolder<MediaTimerPromise> mDelayedOutputRequest; // If draining, a 'DrainComplete' will be sent after all delayed frames have // been output. bool mDraining; // All callbacks are redirected through this task queue, both to avoid locking // and to have a consistent sequencing of callbacks. RefPtr<TaskQueue> mTaskQueue; void ScheduleOutputDelayedFrame(); void OutputDelayedFrame(); public: // public for the benefit of DecoderFuzzingWrapper. void ClearDelayedOutput(); void Shutdown(); }; class DecoderFuzzingWrapper : public MediaDataDecoder { public: DecoderFuzzingWrapper(already_AddRefed<MediaDataDecoder> aDecoder, already_AddRefed<DecoderCallbackFuzzingWrapper> aCallbackWrapper); // MediaDataDecoder implementation. RefPtr<InitPromise> Init() override; void Input(MediaRawData* aSample) override; void Flush() override; void Drain() override; void Shutdown() override; bool IsHardwareAccelerated(nsACString& aFailureReason) const override; const char* GetDescriptionName() const override { return mDecoder->GetDescriptionName(); } private: virtual ~DecoderFuzzingWrapper(); RefPtr<MediaDataDecoder> mDecoder; RefPtr<DecoderCallbackFuzzingWrapper> mCallbackWrapper; }; } // namespace mozilla #endif