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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/. */
#include "CaptureTask.h"
#include "mozilla/dom/ImageCapture.h"
#include "mozilla/dom/ImageCaptureError.h"
#include "mozilla/dom/ImageEncoder.h"
#include "mozilla/dom/MediaStreamTrack.h"
#include "mozilla/dom/VideoStreamTrack.h"
#include "gfxUtils.h"
#include "nsThreadUtils.h"
namespace mozilla {
class CaptureTask::MediaStreamEventListener : public MediaStreamTrackListener
{
public:
explicit MediaStreamEventListener(CaptureTask* aCaptureTask)
: mCaptureTask(aCaptureTask) {};
// MediaStreamListener methods.
void NotifyEnded() override
{
if(!mCaptureTask->mImageGrabbedOrTrackEnd) {
mCaptureTask->PostTrackEndEvent();
}
}
private:
CaptureTask* mCaptureTask;
};
CaptureTask::CaptureTask(dom::ImageCapture* aImageCapture)
: mImageCapture(aImageCapture)
, mEventListener(new MediaStreamEventListener(this))
, mImageGrabbedOrTrackEnd(false)
, mPrincipalChanged(false)
{
}
nsresult
CaptureTask::TaskComplete(already_AddRefed<dom::Blob> aBlob, nsresult aRv)
{
MOZ_ASSERT(NS_IsMainThread());
DetachTrack();
nsresult rv;
RefPtr<dom::Blob> blob(aBlob);
// We have to set the parent because the blob has been generated with a valid one.
if (blob) {
blob = dom::Blob::Create(mImageCapture->GetParentObject(), blob->Impl());
}
if (mPrincipalChanged) {
aRv = NS_ERROR_DOM_SECURITY_ERR;
IC_LOG("MediaStream principal should not change during TakePhoto().");
}
if (NS_SUCCEEDED(aRv)) {
rv = mImageCapture->PostBlobEvent(blob);
} else {
rv = mImageCapture->PostErrorEvent(dom::ImageCaptureError::PHOTO_ERROR, aRv);
}
// Ensure ImageCapture dereference on main thread here because the TakePhoto()
// sequences stopped here.
mImageCapture = nullptr;
return rv;
}
void
CaptureTask::AttachTrack()
{
MOZ_ASSERT(NS_IsMainThread());
dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
track->AddPrincipalChangeObserver(this);
track->AddListener(mEventListener.get());
track->AddDirectListener(this);
}
void
CaptureTask::DetachTrack()
{
MOZ_ASSERT(NS_IsMainThread());
dom::VideoStreamTrack* track = mImageCapture->GetVideoStreamTrack();
track->RemovePrincipalChangeObserver(this);
track->RemoveListener(mEventListener.get());
track->RemoveDirectListener(this);
}
void
CaptureTask::PrincipalChanged(dom::MediaStreamTrack* aMediaStreamTrack)
{
MOZ_ASSERT(NS_IsMainThread());
mPrincipalChanged = true;
}
void
CaptureTask::SetCurrentFrames(const VideoSegment& aSegment)
{
if (mImageGrabbedOrTrackEnd) {
return;
}
// Callback for encoding complete, it calls on main thread.
class EncodeComplete : public dom::EncodeCompleteCallback
{
public:
explicit EncodeComplete(CaptureTask* aTask) : mTask(aTask) {}
nsresult ReceiveBlob(already_AddRefed<dom::Blob> aBlob) override
{
RefPtr<dom::Blob> blob(aBlob);
mTask->TaskComplete(blob.forget(), NS_OK);
mTask = nullptr;
return NS_OK;
}
protected:
RefPtr<CaptureTask> mTask;
};
VideoSegment::ConstChunkIterator iter(aSegment);
while (!iter.IsEnded()) {
VideoChunk chunk = *iter;
// Extract the first valid video frame.
VideoFrame frame;
if (!chunk.IsNull()) {
RefPtr<layers::Image> image;
if (chunk.mFrame.GetForceBlack()) {
// Create a black image.
image = VideoFrame::CreateBlackImage(chunk.mFrame.GetIntrinsicSize());
} else {
image = chunk.mFrame.GetImage();
}
MOZ_ASSERT(image);
mImageGrabbedOrTrackEnd = true;
// Encode image.
nsresult rv;
nsAutoString type(NS_LITERAL_STRING("image/jpeg"));
nsAutoString options;
rv = dom::ImageEncoder::ExtractDataFromLayersImageAsync(
type,
options,
false,
image,
new EncodeComplete(this));
if (NS_FAILED(rv)) {
PostTrackEndEvent();
}
return;
}
iter.Next();
}
}
void
CaptureTask::PostTrackEndEvent()
{
mImageGrabbedOrTrackEnd = true;
// Got track end or finish event, stop the task.
class TrackEndRunnable : public Runnable
{
public:
explicit TrackEndRunnable(CaptureTask* aTask)
: mTask(aTask) {}
NS_IMETHOD Run() override
{
mTask->TaskComplete(nullptr, NS_ERROR_FAILURE);
mTask = nullptr;
return NS_OK;
}
protected:
RefPtr<CaptureTask> mTask;
};
IC_LOG("Got MediaStream track removed or finished event.");
NS_DispatchToMainThread(new TrackEndRunnable(this));
}
} // namespace mozilla
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