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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
119 lines
3.2 KiB
C++
119 lines
3.2 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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#include "VideoSegment.h"
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#include "gfx2DGlue.h"
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#include "ImageContainer.h"
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#include "Layers.h"
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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using namespace layers;
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VideoFrame::VideoFrame(already_AddRefed<Image>& aImage,
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const gfx::IntSize& aIntrinsicSize)
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: mImage(aImage), mIntrinsicSize(aIntrinsicSize), mForceBlack(false),
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mPrincipalHandle(PRINCIPAL_HANDLE_NONE)
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{}
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VideoFrame::VideoFrame()
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: mIntrinsicSize(0, 0), mForceBlack(false), mPrincipalHandle(PRINCIPAL_HANDLE_NONE)
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{}
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VideoFrame::~VideoFrame()
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{}
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void
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VideoFrame::SetNull() {
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mImage = nullptr;
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mIntrinsicSize = gfx::IntSize(0, 0);
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mPrincipalHandle = PRINCIPAL_HANDLE_NONE;
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}
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void
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VideoFrame::TakeFrom(VideoFrame* aFrame)
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{
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mImage = aFrame->mImage.forget();
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mIntrinsicSize = aFrame->mIntrinsicSize;
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mForceBlack = aFrame->GetForceBlack();
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mPrincipalHandle = aFrame->mPrincipalHandle;
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}
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/* static */ already_AddRefed<Image>
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VideoFrame::CreateBlackImage(const gfx::IntSize& aSize)
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{
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RefPtr<ImageContainer> container = LayerManager::CreateImageContainer();
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RefPtr<PlanarYCbCrImage> image = container->CreatePlanarYCbCrImage();
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if (!image) {
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MOZ_ASSERT(false);
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return nullptr;
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}
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int len = ((aSize.width * aSize.height) * 3 / 2);
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// Generate a black image.
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auto frame = MakeUnique<uint8_t[]>(len);
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int y = aSize.width * aSize.height;
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// Fill Y plane.
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memset(frame.get(), 0x10, y);
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// Fill Cb/Cr planes.
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memset(frame.get() + y, 0x80, (len - y));
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const uint8_t lumaBpp = 8;
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const uint8_t chromaBpp = 4;
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layers::PlanarYCbCrData data;
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data.mYChannel = frame.get();
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data.mYSize = gfx::IntSize(aSize.width, aSize.height);
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data.mYStride = (int32_t) (aSize.width * lumaBpp / 8.0);
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data.mCbCrStride = (int32_t) (aSize.width * chromaBpp / 8.0);
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data.mCbChannel = frame.get() + aSize.height * data.mYStride;
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data.mCrChannel = data.mCbChannel + aSize.height * data.mCbCrStride / 2;
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data.mCbCrSize = gfx::IntSize(aSize.width / 2, aSize.height / 2);
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data.mPicX = 0;
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data.mPicY = 0;
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data.mPicSize = gfx::IntSize(aSize.width, aSize.height);
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data.mStereoMode = StereoMode::MONO;
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// SetData copies data, so we can free data.
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if (!image->SetData(data)) {
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MOZ_ASSERT(false);
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return nullptr;
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}
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return image.forget();
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}
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VideoChunk::VideoChunk()
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{}
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VideoChunk::~VideoChunk()
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{}
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void
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VideoSegment::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)
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{
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VideoChunk* chunk = AppendChunk(aDuration);
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VideoFrame frame(aImage, aIntrinsicSize);
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frame.SetForceBlack(aForceBlack);
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frame.SetPrincipalHandle(aPrincipalHandle);
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chunk->mFrame.TakeFrom(&frame);
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}
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VideoSegment::VideoSegment()
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: MediaSegmentBase<VideoSegment, VideoChunk>(VIDEO)
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{}
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VideoSegment::~VideoSegment()
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{}
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} // namespace mozilla
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