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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 MediaDecoderOwner_h_
#define MediaDecoderOwner_h_
#include "mozilla/UniquePtr.h"
#include "MediaInfo.h"
#include "MediaSegment.h"
#include "nsSize.h"
namespace mozilla {
class AbstractThread;
class GMPCrashHelper;
class VideoFrameContainer;
class MediaInfo;
class MediaResult;
enum class RFPTarget : uint32_t;
namespace dom {
class Document;
class HTMLMediaElement;
} // namespace dom
class MediaDecoderOwner {
public:
// Called by the media decoder to indicate that the download is progressing.
virtual void DownloadProgressed() = 0;
// Dispatch an asynchronous event to the decoder owner
virtual void DispatchAsyncEvent(const nsAString& aName) = 0;
// Triggers a recomputation of readyState.
virtual void UpdateReadyState() = 0;
// Called by the decoder object to notify owner might need to dispatch the
// `timeupdate` event due to current time changes.
virtual void MaybeQueueTimeupdateEvent() = 0;
// Return true if decoding should be paused
virtual bool GetPaused() = 0;
// Called by the video decoder object, on the main thread,
// when it has read the metadata containing video dimensions,
// etc.
// Must take ownership of MetadataTags aTags argument.
virtual void MetadataLoaded(const MediaInfo* aInfo,
UniquePtr<const MetadataTags> aTags) = 0;
// Called by the decoder object, on the main thread,
// when it has read the first frame of the video or audio.
virtual void FirstFrameLoaded() = 0;
// Called by the decoder object, on the main thread,
// when the resource has a network error during loading.
// The decoder owner should call Shutdown() on the decoder and drop the
// reference to the decoder to prevent further calls into the decoder.
virtual void NetworkError(const MediaResult& aError) = 0;
// Called by the decoder object, on the main thread, when the
// resource has a decode error during metadata loading or decoding.
// The decoder owner should call Shutdown() on the decoder and drop the
// reference to the decoder to prevent further calls into the decoder.
virtual void DecodeError(const MediaResult& aError) = 0;
// Called by the decoder object, on the main thread, when the
// resource has a decode issue during metadata loading or decoding, but can
// continue decoding.
virtual void DecodeWarning(const MediaResult& aError) = 0;
// Return true if media element error attribute is not null.
virtual bool HasError() const = 0;
// Called by the video decoder object, on the main thread, when the
// resource load has been cancelled.
virtual void LoadAborted() = 0;
// Called by the video decoder object, on the main thread,
// when the video playback has ended.
virtual void PlaybackEnded() = 0;
// Called by the video decoder object, on the main thread,
// when the resource has started seeking.
virtual void SeekStarted() = 0;
// Called by the video decoder object, on the main thread,
// when the resource has completed seeking.
virtual void SeekCompleted() = 0;
// Called by the video decoder object, on the main thread,
// when the resource has aborted seeking.
virtual void SeekAborted() = 0;
// Called by the media stream, on the main thread, when the download
// has been suspended by the cache or because the element itself
// asked the decoder to suspend the download.
virtual void DownloadSuspended() = 0;
// Called by the media decoder to indicate whether the media cache has
// suspended the channel.
virtual void NotifySuspendedByCache(bool aSuspendedByCache) = 0;
// called to notify that the principal of the decoder's media resource has
// changed.
virtual void NotifyDecoderPrincipalChanged() = 0;
// The status of the next frame which might be available from the decoder
enum NextFrameStatus {
// The next frame of audio/video is available
NEXT_FRAME_AVAILABLE,
// The next frame of audio/video is unavailable because the decoder
// is paused while it buffers up data
NEXT_FRAME_UNAVAILABLE_BUFFERING,
// The next frame of audio/video is unavailable for the decoder is seeking.
NEXT_FRAME_UNAVAILABLE_SEEKING,
// The next frame of audio/video is unavailable for some other reasons
NEXT_FRAME_UNAVAILABLE,
// Sentinel value
NEXT_FRAME_UNINITIALIZED
};
// Called by media decoder when the audible state changed
virtual void SetAudibleState(bool aAudible) = 0;
// Notified by the decoder that XPCOM shutdown has begun.
// The decoder owner should call Shutdown() on the decoder and drop the
// reference to the decoder to prevent further calls into the decoder.
virtual void NotifyXPCOMShutdown() = 0;
// Dispatches a "encrypted" event to the HTMLMediaElement, with the
// provided init data. Actual dispatch may be delayed until HAVE_METADATA.
// Main thread only.
virtual void DispatchEncrypted(const nsTArray<uint8_t>& aInitData,
const nsAString& aInitDataType) = 0;
// Notified by the decoder that a decryption key is required before emitting
// further output.
virtual void NotifyWaitingForKey() {}
/*
* Methods that are used only in Gecko go here. We provide defaul
* implementations so they can compile in Servo without modification.
*/
// Return an abstract thread on which to run main thread runnables.
virtual AbstractThread* AbstractMainThread() const { return nullptr; }
// Get the HTMLMediaElement object if the decoder is being used from an
// HTML media element, and null otherwise.
virtual dom::HTMLMediaElement* GetMediaElement() { return nullptr; }
// Called by the media decoder and the video frame to get the
// ImageContainer containing the video data.
virtual VideoFrameContainer* GetVideoFrameContainer() { return nullptr; }
// Return the decoder owner's owner document.
virtual mozilla::dom::Document* GetDocument() const { return nullptr; }
// Called by the media decoder to create a GMPCrashHelper.
virtual already_AddRefed<GMPCrashHelper> CreateGMPCrashHelper() {
return nullptr;
}
// Called by the frame container to notify the layout engine that the
// size of the image has changed, or the video needs to be be repainted
// for some other reason.
enum class ImageSizeChanged { No, Yes };
enum class ForceInvalidate { No, Yes };
virtual void Invalidate(ImageSizeChanged aImageSizeChanged,
const Maybe<nsIntSize>& aNewIntrinsicSize,
ForceInvalidate aForceInvalidate) {}
// Called after the MediaStream we're playing rendered a frame to aContainer
// with a different principalHandle than the previous frame.
virtual void PrincipalHandleChangedForVideoFrameContainer(
VideoFrameContainer* aContainer,
const PrincipalHandle& aNewPrincipalHandle) {}
// Called after the MediaDecoder has installed the given secondary video
// container and render potential frames to it.
virtual void OnSecondaryVideoContainerInstalled(
const RefPtr<VideoFrameContainer>& aSecondaryContainer) {}
// Return true is the owner is actually invisible to users.
virtual bool IsActuallyInvisible() const = 0;
// Returns true if the owner should resist fingerprinting.
virtual bool ShouldResistFingerprinting(RFPTarget aTarget) const = 0;
/*
* Servo only methods go here. Please provide default implementations so they
* can build in Gecko without any modification.
*/
};
} // namespace mozilla
#endif
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