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-rw-r--r--dom/media/AbstractMediaDecoder.h145
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+/* -*- 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/. */
+
+#ifndef AbstractMediaDecoder_h_
+#define AbstractMediaDecoder_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/StateMirroring.h"
+
+#include "FrameStatistics.h"
+#include "MediaEventSource.h"
+#include "MediaInfo.h"
+#include "nsISupports.h"
+#include "nsDataHashtable.h"
+#include "nsThreadUtils.h"
+
+class GMPCrashHelper;
+
+namespace mozilla
+{
+
+namespace layers
+{
+ class ImageContainer;
+ class KnowsCompositor;
+} // namespace layers
+class MediaResource;
+class ReentrantMonitor;
+class VideoFrameContainer;
+class MediaDecoderOwner;
+class CDMProxy;
+
+typedef nsDataHashtable<nsCStringHashKey, nsCString> MetadataTags;
+
+static inline bool IsCurrentThread(nsIThread* aThread) {
+ return NS_GetCurrentThread() == aThread;
+}
+
+/**
+ * The AbstractMediaDecoder class describes the public interface for a media decoder
+ * and is used by the MediaReader classes.
+ */
+class AbstractMediaDecoder : public nsIObserver
+{
+public:
+ // A special version of the above for the ogg decoder that is allowed to be
+ // called cross-thread.
+ virtual bool IsOggDecoderShutdown() { return false; }
+
+ // Get the current MediaResource being used. Its URI will be returned
+ // by currentSrc. Returns what was passed to Load(), if Load() has been called.
+ virtual MediaResource* GetResource() const = 0;
+
+ // Increments the parsed, decoded and dropped frame counters by the passed in
+ // counts.
+ // Can be called on any thread.
+ virtual void NotifyDecodedFrames(const FrameStatisticsData& aStats) = 0;
+
+ virtual AbstractCanonical<media::NullableTimeUnit>* CanonicalDurationOrNull() { return nullptr; };
+
+ // Return an event that will be notified when data arrives in MediaResource.
+ // MediaDecoderReader will register with this event to receive notifications
+ // in order to update buffer ranges.
+ // Return null if this decoder doesn't support the event.
+ virtual MediaEventSource<void>* DataArrivedEvent()
+ {
+ return nullptr;
+ }
+
+ // Returns an event that will be notified when the owning document changes state
+ // and we might have a new compositor. If this new compositor requires us to
+ // recreate our decoders, then we expect the existing decoderis to return an
+ // error independently of this.
+ virtual MediaEventSource<RefPtr<layers::KnowsCompositor>>* CompositorUpdatedEvent()
+ {
+ return nullptr;
+ }
+
+ // Notify the media decoder that a decryption key is required before emitting
+ // further output. This only needs to be overridden for decoders that expect
+ // encryption, such as the MediaSource decoder.
+ virtual void NotifyWaitingForKey() {}
+
+ // Return an event that will be notified when a decoder is waiting for a
+ // decryption key before it can return more output.
+ virtual MediaEventSource<void>* WaitingForKeyEvent()
+ {
+ return nullptr;
+ }
+
+protected:
+ virtual void UpdateEstimatedMediaDuration(int64_t aDuration) {};
+public:
+ void DispatchUpdateEstimatedMediaDuration(int64_t aDuration)
+ {
+ NS_DispatchToMainThread(NewRunnableMethod<int64_t>(this,
+ &AbstractMediaDecoder::UpdateEstimatedMediaDuration,
+ aDuration));
+ }
+
+ virtual VideoFrameContainer* GetVideoFrameContainer() = 0;
+ virtual mozilla::layers::ImageContainer* GetImageContainer() = 0;
+
+ // Returns the owner of this decoder or null when the decoder is shutting
+ // down. The owner should only be used on the main thread.
+ virtual MediaDecoderOwner* GetOwner() const = 0;
+
+ // Set by Reader if the current audio track can be offloaded
+ virtual void SetPlatformCanOffloadAudio(bool aCanOffloadAudio) {}
+
+ virtual already_AddRefed<GMPCrashHelper> GetCrashHelper() { return nullptr; }
+
+ // Stack based class to assist in notifying the frame statistics of
+ // parsed and decoded frames. Use inside video demux & decode functions
+ // to ensure all parsed and decoded frames are reported on all return paths.
+ class AutoNotifyDecoded {
+ public:
+ explicit AutoNotifyDecoded(AbstractMediaDecoder* aDecoder)
+ : mDecoder(aDecoder)
+ {}
+ ~AutoNotifyDecoded() {
+ if (mDecoder) {
+ mDecoder->NotifyDecodedFrames(mStats);
+ }
+ }
+
+ FrameStatisticsData mStats;
+
+ private:
+ AbstractMediaDecoder* mDecoder;
+ };
+
+ // Classes directly inheriting from AbstractMediaDecoder do not support
+ // Observe and it should never be called directly.
+ NS_IMETHOD Observe(nsISupports *aSubject, const char * aTopic, const char16_t * aData) override
+ { MOZ_CRASH("Forbidden method"); return NS_OK; }
+};
+
+} // namespace mozilla
+
+#endif
+