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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NEARBY_SHARING_INCOMING_FRAMES_READER_H_
#define CHROME_BROWSER_NEARBY_SHARING_INCOMING_FRAMES_READER_H_
#include <map>
#include <optional>
#include <vector>
#include "base/cancelable_callback.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "chromeos/ash/services/nearby/public/cpp/nearby_process_manager.h"
#include "chromeos/ash/services/nearby/public/mojom/nearby_decoder_types.mojom.h"
class NearbyConnection;
// Helper class to read incoming frames from Nearby devices.
class IncomingFramesReader {
public:
IncomingFramesReader(ash::nearby::NearbyProcessManager* process_manager,
NearbyConnection* connection);
virtual ~IncomingFramesReader();
IncomingFramesReader(const IncomingFramesReader&) = delete;
IncomingFramesReader& operator=(IncomingFramesReader&) = delete;
// Reads an incoming frame from |connection|. |callback| is called
// with the frame read from connection or nullopt if connection socket is
// closed.
//
// Note: Callers are expected wait for |callback| to be run before scheduling
// subsequent calls to ReadFrame(..).
virtual void ReadFrame(
base::OnceCallback<void(std::optional<sharing::mojom::V1FramePtr>)>
callback);
// Reads a frame of type |frame_type| from |connection|. |callback| is called
// with the frame read from connection or nullopt if connection socket is
// closed or |timeout| units of time has passed.
//
// Note: Callers are expected wait for |callback| to be run before scheduling
// subsequent calls to ReadFrame(..).
virtual void ReadFrame(
sharing::mojom::V1Frame::Tag frame_type,
base::OnceCallback<void(std::optional<sharing::mojom::V1FramePtr>)>
callback,
base::TimeDelta timeout);
private:
void ReadNextFrame();
void OnDataReadFromConnection(std::optional<std::vector<uint8_t>> bytes);
void OnFrameDecoded(sharing::mojom::FramePtr mojo_frame);
void OnTimeout();
void OnNearbyProcessStopped(
ash::nearby::NearbyProcessManager::NearbyProcessShutdownReason
shutdown_reason);
void Done(std::optional<sharing::mojom::V1FramePtr> frame);
std::optional<sharing::mojom::V1FramePtr> GetCachedFrame(
std::optional<sharing::mojom::V1Frame::Tag> frame_type);
sharing::mojom::NearbySharingDecoder* GetOrStartNearbySharingDecoder();
raw_ptr<ash::nearby::NearbyProcessManager> process_manager_;
std::unique_ptr<ash::nearby::NearbyProcessManager::NearbyProcessReference>
process_reference_;
raw_ptr<NearbyConnection> connection_;
std::optional<sharing::mojom::V1Frame::Tag> frame_type_;
base::OnceCallback<void(std::optional<sharing::mojom::V1FramePtr>)> callback_;
base::CancelableOnceClosure timeout_callback_;
// Caches frames read from NearbyConnection which are not used immediately.
std::map<sharing::mojom::V1Frame::Tag, sharing::mojom::V1FramePtr>
cached_frames_;
bool is_process_stopped_ = false;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<IncomingFramesReader> weak_ptr_factory_{this};
};
#endif // CHROME_BROWSER_NEARBY_SHARING_INCOMING_FRAMES_READER_H_
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