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PrincipalHandle is a thread safe pointer to a holder of (the main-thread-only nsIPrincipal) that can be passed around the MSG. A MediaStreamTrack whose source has just updated its principal, sets the new principal aside (as its "pending principal"), and combines the new principal into its current principal. Then the source starts passing the new principal to the MediaStreamGraph as a PrincipalHandle. Changes to a track's PrincipalHandle on the MSG will be surfaced through the MediaStreamTrackListener API. These changes are dispatched to main thread and compared to a MediaStreamTrack's pending principal. In case of a match the track knows the correct principal is flowing and can move the pending principal to be the current principal and update any main thread principal observers. MozReview-Commit-ID: D0JXGWhQFFU --HG-- extra : rebase_source : 296e269bb46fc5a85a9c3f90dfc0dc40e53572bc
146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_VIDEOSEGMENT_H_
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#define MOZILLA_VIDEOSEGMENT_H_
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#include "MediaSegment.h"
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#include "nsCOMPtr.h"
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#include "gfxPoint.h"
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#include "nsAutoPtr.h"
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#include "ImageContainer.h"
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namespace mozilla {
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namespace layers {
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class Image;
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} // namespace layers
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class VideoFrame {
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public:
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typedef mozilla::layers::Image Image;
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VideoFrame(already_AddRefed<Image>& aImage, const gfx::IntSize& aIntrinsicSize);
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VideoFrame();
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~VideoFrame();
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bool operator==(const VideoFrame& aFrame) const
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{
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return mIntrinsicSize == aFrame.mIntrinsicSize &&
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mForceBlack == aFrame.mForceBlack &&
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((mForceBlack && aFrame.mForceBlack) || mImage == aFrame.mImage);
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}
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bool operator!=(const VideoFrame& aFrame) const
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{
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return !operator==(aFrame);
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}
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Image* GetImage() const { return mImage; }
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void SetForceBlack(bool aForceBlack) { mForceBlack = aForceBlack; }
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bool GetForceBlack() const { return mForceBlack; }
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void SetPrincipalHandle(const PrincipalHandle& aPrincipalHandle) { mPrincipalHandle = aPrincipalHandle; }
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PrincipalHandle GetPrincipalHandle() const { return mPrincipalHandle; }
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const gfx::IntSize& GetIntrinsicSize() const { return mIntrinsicSize; }
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void SetNull();
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void TakeFrom(VideoFrame* aFrame);
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// Create a planar YCbCr black image.
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static already_AddRefed<Image> CreateBlackImage(const gfx::IntSize& aSize);
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protected:
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// mImage can be null to indicate "no video" (aka "empty frame"). It can
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// still have an intrinsic size in this case.
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RefPtr<Image> mImage;
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// The desired size to render the video frame at.
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gfx::IntSize mIntrinsicSize;
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bool mForceBlack;
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// principalHandle for the image in this frame.
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// This can be compared to an nsIPrincipal when back on main thread.
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PrincipalHandle mPrincipalHandle;
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};
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struct VideoChunk {
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VideoChunk();
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~VideoChunk();
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void SliceTo(StreamTime aStart, StreamTime aEnd)
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{
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NS_ASSERTION(aStart >= 0 && aStart < aEnd && aEnd <= mDuration,
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"Slice out of bounds");
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mDuration = aEnd - aStart;
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}
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StreamTime GetDuration() const { return mDuration; }
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bool CanCombineWithFollowing(const VideoChunk& aOther) const
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{
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return aOther.mFrame == mFrame;
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}
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bool IsNull() const { return !mFrame.GetImage(); }
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void SetNull(StreamTime aDuration)
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{
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mDuration = aDuration;
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mFrame.SetNull();
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mTimeStamp = TimeStamp();
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}
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void SetForceBlack(bool aForceBlack) { mFrame.SetForceBlack(aForceBlack); }
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size_t SizeOfExcludingThisIfUnshared(MallocSizeOf aMallocSizeOf) const
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{
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// Future:
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// - mFrame
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return 0;
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}
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PrincipalHandle GetPrincipalHandle() const { return mFrame.GetPrincipalHandle(); }
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StreamTime mDuration;
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VideoFrame mFrame;
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mozilla::TimeStamp mTimeStamp;
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};
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class VideoSegment : public MediaSegmentBase<VideoSegment, VideoChunk> {
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public:
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typedef mozilla::layers::Image Image;
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typedef mozilla::gfx::IntSize IntSize;
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VideoSegment();
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~VideoSegment();
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void AppendFrame(already_AddRefed<Image>&& aImage,
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StreamTime aDuration,
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const IntSize& aIntrinsicSize,
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const PrincipalHandle& aPrincipalHandle,
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bool aForceBlack = false);
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const VideoFrame* GetLastFrame(StreamTime* aStart = nullptr)
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{
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VideoChunk* c = GetLastChunk();
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if (!c) {
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return nullptr;
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}
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if (aStart) {
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*aStart = mDuration - c->mDuration;
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}
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return &c->mFrame;
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}
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// Override default impl
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void ReplaceWithDisabled() override {
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for (ChunkIterator i(*this);
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!i.IsEnded(); i.Next()) {
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VideoChunk& chunk = *i;
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chunk.SetForceBlack(true);
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}
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}
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// Segment-generic methods not in MediaSegmentBase
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static Type StaticType() { return VIDEO; }
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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};
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} // namespace mozilla
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#endif /* MOZILLA_VIDEOSEGMENT_H_ */
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