joystickinputhandler.cc

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2004 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

//------------------------------------------------------------------------------

#include "JoystickInputHandler.h"

#include "sched/Scheduler.h"

#include "util/Config.h"

#include <linux/joystick.h>

//------------------------------------------------------------------------------

using input::JoystickInputHandler;

using sched::Scheduler;

//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

JoystickInputHandler::axisPosition_t 
JoystickInputHandler::getPosition(int value)
{
    if (value<-16384) return LEFT;
    else if (value>16384) return RIGHT;
    else return CENTERED;
}

//------------------------------------------------------------------------------

JoystickInputHandler::JoystickInputHandler(InputListener& listener) :
    Schedulable("JoystickInputHandler", 16*1024),
    CommandInputHandler(listener),
    inputReadable("JoystickInputHandler", "inputReadable"),
    axisPositions(0)
{
    int fd = open(Config::get().js, O_RDONLY|O_NONBLOCK);

    if (fd<0) {
        Log::warning("Could not open joystick device '%s', ignoring\n",
                     Config::get().js);
        return;
    }

    char numberOfAxes;
    POSIX::ioctl(fd, JSIOCGAXES, &numberOfAxes);

    axisPositions = new axisPosition_t[numberOfAxes];
    for(char i = 0; i<numberOfAxes; ++i) {
        axisPositions[i] = CENTERED;
    }

    inputReadable.setFileDescriptor(fd);
}

//------------------------------------------------------------------------------

JoystickInputHandler::~JoystickInputHandler()
{
    delete[] axisPositions;
}

//------------------------------------------------------------------------------

void JoystickInputHandler::run()
{
    const Config& config = Config::get();

    Log::debug("Joystick input handler started\n");
    while(!shouldQuit() && inputReadable.getFileDescriptor()>=0) {
        clearInterrupt();

        if (Scheduler::waitInterruptible(inputReadable)) {
            struct js_event e;
            
            ssize_t a = POSIX::read(inputReadable.getFileDescriptor(),
                                    &e, sizeof(e), "Error reading from joystick");
            if (a==sizeof(e)) {
                const char* command = 0;
                if (e.type==JS_EVENT_AXIS) {
                    size_t axisNumber = e.number;
                    axisPosition_t axisPosition = getPosition(e.value);
                    if (axisPosition!=axisPositions[axisNumber]) {
                        axisPositions[axisNumber] = axisPosition;
                        if (axisPosition==LEFT) 
                          command = config.joystick.getLeftCommand(axisNumber);
                        else if (axisPosition==RIGHT)
                          command = config.joystick.getRightCommand(axisNumber);
                    }
                } else if (e.type==JS_EVENT_BUTTON) {
                    if (e.value==1) {
                        command = config.joystick.getButtonCommand(e.number);
                    }
                }
                if (command!=0) {
                    Log::debug("input::JoystickInputHandler::run: joystick command: %s\n", command);
                    processCommand(command);
                }
            }
        }
        
    }

    Log::debug("Joystick input handler exiting\n");
}

//------------------------------------------------------------------------------