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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_CAST_STREAMING_RENDERER_WEB_CODECS_STREAM_CONTROL_CHANNEL_H_
#define COMPONENTS_CAST_STREAMING_RENDERER_WEB_CODECS_STREAM_CONTROL_CHANNEL_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "components/cast_streaming/common/public/mojom/demuxer_connector.mojom.h"
#include "components/cast_streaming/renderer/common/buffer_requester.h"
#include "components/cast_streaming/renderer/public/decoder_buffer_provider.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
namespace cast_streaming::webcodecs {
// This class handles synchronization between JavaScript configuration of the
// receiver and the mojo API used for requesting audio and video buffers.
class StreamControlChannel : public mojom::DemuxerConnector,
public AudioBufferRequester::Client,
public VideoBufferRequester::Client {
public:
class Client {
public:
virtual ~Client() = default;
virtual void OnNewAudioBufferProvider(
base::WeakPtr<AudioDecoderBufferProvider> ptr) = 0;
virtual void OnNewVideoBufferProvider(
base::WeakPtr<VideoDecoderBufferProvider> ptr) = 0;
};
StreamControlChannel(
Client* client,
mojo::PendingAssociatedReceiver<mojom::DemuxerConnector> receiver,
scoped_refptr<base::SequencedTaskRunner> task_runner);
~StreamControlChannel() override;
// To be called when javascript has successfully configured the receiver.
void OnJavascriptConfigured();
private:
// AudioBufferRequester::Client implementation.
void OnNewBufferProvider(
base::WeakPtr<AudioDecoderBufferProvider> ptr) override;
// VideoBufferRequester::Client implementation.
void OnNewBufferProvider(
base::WeakPtr<VideoDecoderBufferProvider> ptr) override;
// mojom::DemuxerConnector implementation.
void EnableReceiver(EnableReceiverCallback callback) override;
void OnStreamsInitialized(
mojom::AudioStreamInitializationInfoPtr audio_stream_info,
mojom::VideoStreamInitializationInfoPtr video_stream_info) override;
// Synchronization between the browser-process sender as configured over mojo
// and the javascript used to display this cast stream. Each of these
// initializations may occur in either order (or either may not occur in the
// case where streaming is not initiated), so these variables are needed to
// correctly synchronize around these two conditions.
bool has_javascript_been_configured_ = false;
EnableReceiverCallback enable_receiver_callback_;
const raw_ptr<Client> client_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
std::unique_ptr<AudioBufferRequester> audio_buffer_requester_;
std::unique_ptr<VideoBufferRequester> video_buffer_requester_;
mojo::AssociatedReceiver<mojom::DemuxerConnector> receiver_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace cast_streaming::webcodecs
#endif // COMPONENTS_CAST_STREAMING_RENDERER_WEB_CODECS_STREAM_CONTROL_CHANNEL_H_
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