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// Copyright 2015 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.
#ifndef EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_
#define EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_
#include <deque>
#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "extensions/browser/api/serial/serial_connection.h"
#include "extensions/browser/api/webcam_private/webcam.h"
#include "extensions/common/api/serial.h"
namespace extensions {
class ViscaWebcam : public Webcam {
public:
ViscaWebcam(const std::string& path, const std::string& extension_id);
using OpenCompleteCallback = base::Callback<void(bool)>;
// Open and initialize the web camera. This is done by the following three
// steps (in order): 1. Open the serial port; 2. Request address; 3. Clear
// the command buffer. After these three steps completes, |open_callback| will
// be called.
void Open(const OpenCompleteCallback& open_callback);
private:
~ViscaWebcam() override;
enum InquiryType {
INQUIRY_PAN,
INQUIRY_TILT,
INQUIRY_ZOOM,
};
using CommandCompleteCallback =
base::Callback<void(bool, const std::vector<char>&)>;
void OpenOnIOThread(const OpenCompleteCallback& open_callback);
// Callback function that will be called after the serial connection has been
// opened successfully.
void OnConnected(const OpenCompleteCallback& open_callback, bool success);
// Callback function that will be called after the address has been set
// successfully.
void OnAddressSetCompleted(const OpenCompleteCallback& open_callback,
bool success,
const std::vector<char>& response);
// Callback function that will be called after the command buffer has been
// cleared successfully.
void OnClearAllCompleted(const OpenCompleteCallback& open_callback,
bool success,
const std::vector<char>& response);
// Send or queue a command and wait for the camera's response.
void Send(const std::vector<char>& command,
const CommandCompleteCallback& callback);
void OnSendCompleted(const CommandCompleteCallback& callback,
int bytes_sent,
api::serial::SendError error);
void ReceiveLoop(const CommandCompleteCallback& callback);
void OnReceiveCompleted(const CommandCompleteCallback& callback,
const std::vector<char>& data,
api::serial::ReceiveError error);
// Callback function that will be called after the send and reply of a command
// are both completed.
void OnCommandCompleted(const SetPTZCompleteCallback& callback,
bool success,
const std::vector<char>& response);
// Callback function that will be called after the send and reply of an
// inquiry are both completed.
void OnInquiryCompleted(InquiryType type,
const GetPTZCompleteCallback& callback,
bool success,
const std::vector<char>& response);
void PostOpenFailureTask(const OpenCompleteCallback& open_callback);
// Webcam Overrides:
void GetPan(const GetPTZCompleteCallback& callback) override;
void GetTilt(const GetPTZCompleteCallback& callback) override;
void GetZoom(const GetPTZCompleteCallback& callback) override;
void SetPan(int value,
int pan_speed,
const SetPTZCompleteCallback& callback) override;
void SetTilt(int value,
int tilt_speed,
const SetPTZCompleteCallback& callback) override;
void SetZoom(int value, const SetPTZCompleteCallback& callback) override;
void SetPanDirection(PanDirection direction,
int pan_speed,
const SetPTZCompleteCallback& callback) override;
void SetTiltDirection(TiltDirection direction,
int tilt_speed,
const SetPTZCompleteCallback& callback) override;
void Reset(bool pan,
bool tilt,
bool zoom,
const SetPTZCompleteCallback& callback) override;
const std::string path_;
const std::string extension_id_;
scoped_ptr<SerialConnection> serial_connection_;
// Stores the response for the current command.
std::vector<char> data_buffer_;
// Queues commands till the current command completes.
std::deque<std::pair<std::vector<char>, CommandCompleteCallback>> commands_;
// Visca webcam always get/set pan-tilt together. |pan| and |tilt| are used to
// store the current value of pan and tilt positions.
int pan_;
int tilt_;
base::WeakPtrFactory<ViscaWebcam> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ViscaWebcam);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_WEBCAM_PRIVATE_VISCA_WEBCAM_H_
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