зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
4.0 KiB
C++
128 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef AbstractMediaDecoder_h_
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#define AbstractMediaDecoder_h_
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#include "mozilla/Attributes.h"
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#include "mozilla/StateMirroring.h"
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#include "MediaEventSource.h"
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#include "MediaInfo.h"
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#include "nsISupports.h"
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#include "nsDataHashtable.h"
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#include "nsThreadUtils.h"
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namespace mozilla
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{
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namespace layers
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{
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class ImageContainer;
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} // namespace layers
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class MediaResource;
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class ReentrantMonitor;
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class VideoFrameContainer;
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class MediaDecoderOwner;
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#ifdef MOZ_EME
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class CDMProxy;
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#endif
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typedef nsDataHashtable<nsCStringHashKey, nsCString> MetadataTags;
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static inline bool IsCurrentThread(nsIThread* aThread) {
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return NS_GetCurrentThread() == aThread;
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}
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enum class MediaDecoderEventVisibility : int8_t {
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Observable,
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Suppressed
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};
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/**
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* The AbstractMediaDecoder class describes the public interface for a media decoder
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* and is used by the MediaReader classes.
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*/
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class AbstractMediaDecoder : public nsIObserver
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{
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public:
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// A special version of the above for the ogg decoder that is allowed to be
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// called cross-thread.
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virtual bool IsOggDecoderShutdown() { return false; }
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// Get the current MediaResource being used. Its URI will be returned
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// by currentSrc. Returns what was passed to Load(), if Load() has been called.
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virtual MediaResource* GetResource() const = 0;
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// Increments the parsed, decoded and dropped frame counters by the passed in
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// counts.
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// Can be called on any thread.
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virtual void NotifyDecodedFrames(uint32_t aParsed, uint32_t aDecoded,
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uint32_t aDropped) = 0;
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virtual AbstractCanonical<media::NullableTimeUnit>* CanonicalDurationOrNull() { return nullptr; };
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// Return an event that will be notified when data arrives in MediaResource.
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// MediaDecoderReader will register with this event to receive notifications
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// in order to udpate buffer ranges.
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// Return null if this decoder doesn't support the event.
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virtual MediaEventSource<void>* DataArrivedEvent()
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{
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return nullptr;
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}
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protected:
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virtual void UpdateEstimatedMediaDuration(int64_t aDuration) {};
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public:
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void DispatchUpdateEstimatedMediaDuration(int64_t aDuration)
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{
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nsCOMPtr<nsIRunnable> r =
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NS_NewRunnableMethodWithArg<int64_t>(this, &AbstractMediaDecoder::UpdateEstimatedMediaDuration,
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aDuration);
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NS_DispatchToMainThread(r);
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}
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virtual VideoFrameContainer* GetVideoFrameContainer() = 0;
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virtual mozilla::layers::ImageContainer* GetImageContainer() = 0;
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// Returns the owner of this media decoder. The owner should only be used
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// on the main thread.
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virtual MediaDecoderOwner* GetOwner() = 0;
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// Set by Reader if the current audio track can be offloaded
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virtual void SetPlatformCanOffloadAudio(bool aCanOffloadAudio) {}
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// Stack based class to assist in notifying the frame statistics of
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// parsed and decoded frames. Use inside video demux & decode functions
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// to ensure all parsed and decoded frames are reported on all return paths.
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class AutoNotifyDecoded {
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public:
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explicit AutoNotifyDecoded(AbstractMediaDecoder* aDecoder)
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: mParsed(0), mDecoded(0), mDropped(0), mDecoder(aDecoder) {}
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~AutoNotifyDecoded() {
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if (mDecoder) {
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mDecoder->NotifyDecodedFrames(mParsed, mDecoded, mDropped);
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}
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}
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uint32_t mParsed;
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uint32_t mDecoded;
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uint32_t mDropped;
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private:
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AbstractMediaDecoder* mDecoder;
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};
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// Classes directly inheriting from AbstractMediaDecoder do not support
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// Observe and it should never be called directly.
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NS_IMETHOD Observe(nsISupports *aSubject, const char * aTopic, const char16_t * aData) override
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{ MOZ_CRASH("Forbidden method"); return NS_OK; }
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};
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} // namespace mozilla
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#endif
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