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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/layers/video_frame_provider_client_impl.h"
#include "base/trace_event/trace_event.h"
#include "cc/base/math_util.h"
#include "cc/layers/video_layer_impl.h"
#include "media/base/video_frame.h"
namespace cc {
// static
scoped_refptr<VideoFrameProviderClientImpl>
VideoFrameProviderClientImpl::Create(VideoFrameProvider* provider,
VideoFrameControllerClient* client) {
return base::WrapRefCounted(
new VideoFrameProviderClientImpl(provider, client));
}
VideoFrameProviderClientImpl::VideoFrameProviderClientImpl(
VideoFrameProvider* provider,
VideoFrameControllerClient* client)
: provider_(provider),
client_(client),
active_video_layer_(nullptr),
stopped_(false),
rendering_(false),
needs_put_current_frame_(false) {
// |provider_| may be null if destructed before the layer.
if (provider_) {
// This only happens during a commit on the compositor thread while the main
// thread is blocked. That makes this a thread-safe call to set the video
// frame provider client that does not require a lock. The same is true of
// the call to Stop().
provider_->SetVideoFrameProviderClient(this);
}
}
VideoFrameProviderClientImpl::~VideoFrameProviderClientImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(stopped_);
}
VideoLayerImpl* VideoFrameProviderClientImpl::ActiveVideoLayer() const {
DCHECK(thread_checker_.CalledOnValidThread());
return active_video_layer_;
}
void VideoFrameProviderClientImpl::SetActiveVideoLayer(
VideoLayerImpl* video_layer) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(video_layer);
active_video_layer_ = video_layer;
}
void VideoFrameProviderClientImpl::Stop() {
DCHECK(thread_checker_.CalledOnValidThread());
active_video_layer_ = nullptr;
// It's called when the main thread is blocked, so lock isn't needed.
if (provider_) {
provider_->SetVideoFrameProviderClient(nullptr);
provider_ = nullptr;
}
if (rendering_)
StopRendering();
stopped_ = true;
}
bool VideoFrameProviderClientImpl::Stopped() const {
DCHECK(thread_checker_.CalledOnValidThread());
return stopped_;
}
scoped_refptr<media::VideoFrame>
VideoFrameProviderClientImpl::AcquireLockAndCurrentFrame() {
DCHECK(thread_checker_.CalledOnValidThread());
provider_lock_.Acquire(); // Balanced by call to ReleaseLock().
if (!provider_)
return nullptr;
return provider_->GetCurrentFrame();
}
void VideoFrameProviderClientImpl::PutCurrentFrame() {
DCHECK(thread_checker_.CalledOnValidThread());
provider_lock_.AssertAcquired();
provider_->PutCurrentFrame();
needs_put_current_frame_ = false;
}
void VideoFrameProviderClientImpl::ReleaseLock() {
DCHECK(thread_checker_.CalledOnValidThread());
provider_lock_.AssertAcquired();
provider_lock_.Release();
}
bool VideoFrameProviderClientImpl::HasCurrentFrame() {
base::AutoLock locker(provider_lock_);
return provider_ && provider_->HasCurrentFrame();
}
void VideoFrameProviderClientImpl::StopUsingProvider() {
{
// Block the provider from shutting down until this client is done
// using the frame.
base::AutoLock locker(provider_lock_);
provider_ = nullptr;
}
if (rendering_)
StopRendering();
}
void VideoFrameProviderClientImpl::StartRendering() {
DCHECK(thread_checker_.CalledOnValidThread());
TRACE_EVENT0("cc", "VideoFrameProviderClientImpl::StartRendering");
DCHECK(!rendering_);
DCHECK(!stopped_);
rendering_ = true;
client_->AddVideoFrameController(this);
}
void VideoFrameProviderClientImpl::StopRendering() {
DCHECK(thread_checker_.CalledOnValidThread());
TRACE_EVENT0("cc", "VideoFrameProviderClientImpl::StopRendering");
DCHECK(rendering_);
DCHECK(!stopped_);
client_->RemoveVideoFrameController(this);
rendering_ = false;
if (active_video_layer_)
active_video_layer_->SetNeedsRedraw();
}
void VideoFrameProviderClientImpl::DidReceiveFrame() {
TRACE_EVENT1("cc",
"VideoFrameProviderClientImpl::DidReceiveFrame",
"active_video_layer",
!!active_video_layer_);
DCHECK(thread_checker_.CalledOnValidThread());
needs_put_current_frame_ = true;
if (active_video_layer_)
active_video_layer_->SetNeedsRedraw();
}
void VideoFrameProviderClientImpl::OnBeginFrame(
const viz::BeginFrameArgs& args) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(rendering_);
DCHECK(!stopped_);
TRACE_EVENT0("cc", "VideoFrameProviderClientImpl::OnBeginFrame");
{
base::AutoLock locker(provider_lock_);
// We use frame_time + interval here because that is the estimated time at
// which a frame returned during this phase will end up being displayed.
if (!provider_ ||
!provider_->UpdateCurrentFrame(args.frame_time + args.interval,
args.frame_time + 2 * args.interval)) {
return;
}
}
// Warning: Do not hold |provider_lock_| while calling this function, it may
// lead to a reentrant call to HasCurrentFrame() above.
DidReceiveFrame();
}
void VideoFrameProviderClientImpl::DidDrawFrame() {
DCHECK(thread_checker_.CalledOnValidThread());
{
base::AutoLock locker(provider_lock_);
if (provider_ && needs_put_current_frame_)
provider_->PutCurrentFrame();
}
needs_put_current_frame_ = false;
}
bool VideoFrameProviderClientImpl::IsDrivingFrameUpdates() const {
// We drive frame updates any time we're rendering, even if we're off-screen.
return rendering_;
}
} // namespace cc
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