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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/mirroring/service/media_remoter.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/notimplemented.h"
#include "components/mirroring/service/remoting_sender.h"
#include "components/mirroring/service/rpc_dispatcher.h"
#include "media/base/media_switches.h"
#include "third_party/openscreen/src/cast/streaming/public/sender.h"
using media::cast::FrameSenderConfig;
namespace mirroring {
MediaRemoter::MediaRemoter(
Client& client,
const media::mojom::RemotingSinkMetadata& sink_metadata,
RpcDispatcher& rpc_dispatcher)
: client_(client),
sink_metadata_(sink_metadata),
rpc_dispatcher_(rpc_dispatcher),
state_(MIRRORING) {
client_->ConnectToRemotingSource(
receiver_.BindNewPipeAndPassRemote(),
remoting_source_.BindNewPipeAndPassReceiver());
remoting_source_->OnSinkAvailable(sink_metadata_.Clone());
}
MediaRemoter::~MediaRemoter() {
// Stop this remoting session if mirroring is stopped during a remoting
// session. For example, user stops mirroring through the cast dialog or
// closes the tab.
Stop(media::mojom::RemotingStopReason::ROUTE_TERMINATED);
}
void MediaRemoter::OnMessageFromSink(const std::vector<uint8_t>& response) {
remoting_source_->OnMessageFromSink(response);
}
void MediaRemoter::StartRpcMessaging(
scoped_refptr<media::cast::CastEnvironment> cast_environment,
std::unique_ptr<openscreen::cast::Sender> audio_sender,
std::unique_ptr<openscreen::cast::Sender> video_sender,
std::optional<FrameSenderConfig> audio_config,
std::optional<FrameSenderConfig> video_config) {
DCHECK(audio_sender || video_sender);
DCHECK(audio_config || video_config);
DCHECK(!openscreen_audio_sender_);
DCHECK(!openscreen_video_sender_);
openscreen_audio_sender_ = std::move(audio_sender);
openscreen_video_sender_ = std::move(video_sender);
StartRpcMessagingInternal(std::move(cast_environment),
std::move(audio_config), std::move(video_config));
}
void MediaRemoter::StartRpcMessagingInternal(
scoped_refptr<media::cast::CastEnvironment> cast_environment,
std::optional<FrameSenderConfig> audio_config,
std::optional<FrameSenderConfig> video_config) {
DCHECK(!cast_environment_);
if (state_ != STARTING_REMOTING) {
openscreen_audio_sender_ = nullptr;
openscreen_video_sender_ = nullptr;
return; // Start operation was canceled.
}
// A remoting streaming session started. Start RPC message transport and
// notify the remoting source to start data streaming.
cast_environment_ = std::move(cast_environment);
audio_config_ = std::move(audio_config);
video_config_ = std::move(video_config);
rpc_dispatcher_->Subscribe(base::BindRepeating(
&MediaRemoter::OnMessageFromSink, weak_factory_.GetWeakPtr()));
state_ = REMOTING_STARTED;
remoting_source_->OnStarted();
}
void MediaRemoter::OnMirroringResumed(bool is_tab_switching) {
if (state_ == REMOTING_DISABLED) {
return;
}
DCHECK(state_ == STOPPING_REMOTING ||
(state_ == MIRRORING && is_tab_switching));
state_ = MIRRORING;
if (is_tab_switching) {
receiver_.reset();
remoting_source_.reset();
client_->ConnectToRemotingSource(
receiver_.BindNewPipeAndPassRemote(),
remoting_source_.BindNewPipeAndPassReceiver());
}
// Notify the remoting source to enable starting media remoting again.
remoting_source_->OnSinkAvailable(sink_metadata_.Clone());
}
void MediaRemoter::OnRemotingFailed() {
DCHECK(state_ == STARTING_REMOTING || state_ == REMOTING_STARTED);
if (state_ == STARTING_REMOTING) {
remoting_source_->OnStartFailed(
media::mojom::RemotingStartFailReason::INVALID_ANSWER_MESSAGE);
}
state_ = REMOTING_DISABLED;
remoting_source_->OnSinkGone();
// Fallback to mirroring.
client_->RestartMirroringStreaming();
}
void MediaRemoter::Stop(media::mojom::RemotingStopReason reason) {
if (state_ == STOPPING_REMOTING || state_ == MIRRORING) {
return;
}
// At this point, we are currently remoting and should tear down.
rpc_dispatcher_->Unsubscribe();
audio_sender_.reset();
video_sender_.reset();
cast_environment_ = nullptr;
openscreen_audio_sender_ = nullptr;
openscreen_video_sender_ = nullptr;
audio_config_ = std::nullopt;
video_config_ = std::nullopt;
// Don't change `state_` if remoting is disabled so that it won't attempt to
// start remoting again after mirroring resumed.
if (state_ != REMOTING_DISABLED) {
state_ = STOPPING_REMOTING;
}
remoting_source_->OnStopped(reason);
// Prevent the start of remoting until switching completes.
remoting_source_->OnSinkGone();
// Switch to mirroring.
client_->RestartMirroringStreaming();
}
void MediaRemoter::Start() {
if (state_ != MIRRORING) {
VLOG(2) << "Warning: Ignore start request. state=" << state_;
return;
}
state_ = STARTING_REMOTING;
client_->RequestRemotingStreaming();
}
void MediaRemoter::StartWithPermissionAlreadyGranted() {
NOTIMPLEMENTED();
}
void MediaRemoter::StartDataStreams(
mojo::ScopedDataPipeConsumerHandle audio_pipe,
mojo::ScopedDataPipeConsumerHandle video_pipe,
mojo::PendingReceiver<media::mojom::RemotingDataStreamSender>
audio_sender_receiver,
mojo::PendingReceiver<media::mojom::RemotingDataStreamSender>
video_sender_receiver) {
if (state_ != REMOTING_STARTED) {
return; // Stop() was called before.
}
DCHECK(cast_environment_);
DCHECK(openscreen_audio_sender_ || openscreen_video_sender_);
if (audio_pipe.is_valid() && audio_config_ && audio_config_->is_remoting() &&
openscreen_audio_sender_) {
// NOTE: use of base::Unretained is safe because we own the sender.
audio_sender_ = std::make_unique<RemotingSender>(
cast_environment_, std::move(openscreen_audio_sender_), *audio_config_,
std::move(audio_pipe), std::move(audio_sender_receiver),
base::BindOnce(&MediaRemoter::OnRemotingDataStreamError,
base::Unretained(this)));
}
if (video_pipe.is_valid() && video_config_ && video_config_->is_remoting() &&
openscreen_video_sender_) {
// NOTE: use of base::Unretained is safe because we own the sender.
video_sender_ = std::make_unique<RemotingSender>(
cast_environment_, std::move(openscreen_video_sender_), *video_config_,
std::move(video_pipe), std::move(video_sender_receiver),
base::BindOnce(&MediaRemoter::OnRemotingDataStreamError,
base::Unretained(this)));
}
}
void MediaRemoter::SendMessageToSink(const std::vector<uint8_t>& message) {
if (state_ != REMOTING_STARTED) {
return;
}
rpc_dispatcher_->SendOutboundMessage(message);
}
void MediaRemoter::EstimateTransmissionCapacity(
media::mojom::Remoter::EstimateTransmissionCapacityCallback callback) {
NOTIMPLEMENTED();
std::move(callback).Run(0);
}
void MediaRemoter::OnRemotingDataStreamError() {
if (state_ != REMOTING_STARTED) {
return;
}
Stop(media::mojom::RemotingStopReason::DATA_SEND_FAILED);
state_ = REMOTING_DISABLED;
}
} // namespace mirroring
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