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// Copyright 2021 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_BROWSER_CONTROL_RENDERER_CONTROL_MULTIPLEXER_H_
#define COMPONENTS_CAST_STREAMING_BROWSER_CONTROL_RENDERER_CONTROL_MULTIPLEXER_H_
#include <memory>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "media/mojo/mojom/renderer.mojom.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace cast_streaming {
// This class is responsible for multiplexing a number of media::mojo::Renderer
// callers by forwarding all such calls across a single mojo pipe.
class RendererControlMultiplexer : public media::mojom::Renderer {
public:
RendererControlMultiplexer(
mojo::Remote<media::mojom::Renderer> renderer_remote,
scoped_refptr<base::SequencedTaskRunner> task_runner);
~RendererControlMultiplexer() override;
// Adds a new mojo pipe for which calls should be forwarded to
// |renderer_remote_|.
void RegisterController(
mojo::PendingReceiver<media::mojom::Renderer> controls);
// Starts playback after a delay, if it has not already started.
void TryStartPlayback(base::TimeDelta time_delta);
// media::mojo::Renderer overrides.
//
// These calls only function to forward calls to |renderer_remote_|. Note that
// mojo::FusePipes() cannot be used instead because we must retain the
// |renderer_remote_| instance to make calls from here.
void StartPlayingFrom(::base::TimeDelta time) override;
void SetPlaybackRate(double playback_rate) override;
void SetVolume(float volume) override;
void SetCdm(const std::optional<::base::UnguessableToken>& cdm_id,
SetCdmCallback callback) override;
void SetLatencyHint(std::optional<base::TimeDelta> latency_hint) override;
void Initialize(
mojo::PendingAssociatedRemote<media::mojom::RendererClient> client,
std::optional<
std::vector<::mojo::PendingRemote<::media::mojom::DemuxerStream>>>
streams,
InitializeCallback callback) override;
void Flush(FlushCallback callback) override;
private:
void OnMojoDisconnect();
void OnFlushComplete(FlushCallback callback);
// Called by TryStartPlayback after a delay to begin playback, if it has
// not yet started.
void TryStartPlaybackAfterDelay(base::TimeDelta time_delta);
bool is_playback_ongoing_ = false;
mojo::Remote<media::mojom::Renderer> renderer_remote_;
std::vector<std::unique_ptr<mojo::Receiver<media::mojom::Renderer>>>
receiver_list_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<RendererControlMultiplexer> weak_factory_;
};
} // namespace cast_streaming
#endif // COMPONENTS_CAST_STREAMING_BROWSER_CONTROL_RENDERER_CONTROL_MULTIPLEXER_H_
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