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# jlcVcrDevice.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
    //
    // Use of this software is subject to the terms of the Autodesk
    // license agreement provided at the time of installation or download,
    // or which otherwise accompanies this software in either electronic
    // or hard copy form.
    // ==========================================================================
    //+

    //
    //  JLCVCRdevice
    //
    //  Description:
    //          The jlcVcr class is an interface to the
    //          JLCooper midi VCR control box.
    //

    #if defined (LINUX) || defined (SGI)
    #include <dmedia/midi.h>
    #endif

    #include <maya/MIOStream.h>

    #include <maya/MPxMidiInputDevice.h>
    #include <maya/MDeviceState.h>
    #include <maya/MDeviceChannel.h>
    #include <maya/MString.h>
    #include <maya/MFnPlugin.h>
    #include <maya/MObject.h>

    #define kVCRRewindButtonName "rewind"
    #define kVCRRewindButtonIndex 0
    #define kVCRForwardButtonName "forward"
    #define kVCRForwardButtonIndex 1
    #define kVCRStopButtonName "stop"
    #define kVCRStopButtonIndex 2
    #define kVCRPlayButtonName "play"
    #define kVCRPlayButtonIndex 3
    #define kVCRRecordButtonName "record"
    #define kVCRRecordButtonIndex 4
    #define kVCRLastButtonIndex 5

    #define kVCRScrubWheelName "scrub"
    #define kVCRScrubWheelIndex 0
    #define kVCRLastAxisIndex 1

    #define kVCRRewindUp    0x07
    #define kVCRRewindDown  0x47
    #define kVCRForwardUp   0x06
    #define kVCRForwardDown 0x46
    #define kVCRStopUp      0x05
    #define kVCRStopDown    0x45
    #define kVCRPlayUp      0x04
    #define kVCRPlayDown    0x44
    #define kVCRRecordUp    0x00
    #define kVCRRecordDown  0x40

    class jlcVcr : public MPxMidiInputDevice {

    public:
                                    jlcVcr();
        virtual                     ~jlcVcr();

        virtual void                nameAxes();
        virtual void                nameButtons();

        static void*                creator();

    protected:
        virtual MDeviceState*       deviceState();
    #if defined (LINUX) || defined (SGI)
        virtual MDeviceState*       deviceState(MDevent&);
    #endif
    };

    jlcVcr::jlcVcr()
    {
        setDegreesOfFreedom( kVCRLastAxisIndex );
        setNumberOfButtons( kVCRLastButtonIndex );
    }

    jlcVcr::~jlcVcr() {}

    void* jlcVcr::creator()
    {
        return new jlcVcr();
    }

    // Name the buttons of this device
    void jlcVcr::nameButtons()
    {
        MString name;

        name.set(kVCRRewindButtonName);
        setNamedButton(name, kVCRRewindButtonIndex);

        name.set(kVCRForwardButtonName);
        setNamedButton(name, kVCRForwardButtonIndex);

        name.set(kVCRStopButtonName);
        setNamedButton(name, kVCRStopButtonIndex);

        name.set(kVCRPlayButtonName);
        setNamedButton(name, kVCRPlayButtonIndex);

        name.set(kVCRRecordButtonName);
        setNamedButton(name, kVCRRecordButtonIndex);
    }

    // Name the axes of this device
    void jlcVcr::nameAxes()
    {
        MString name(kVCRScrubWheelName);

        MDeviceChannel* scrubChannel =
            new MDeviceChannel(name, NULL, kVCRScrubWheelIndex);

        addChannel( *scrubChannel );
    }

    MDeviceState* jlcVcr::deviceState()
    {
        return MPxMidiInputDevice::deviceState();
    }

    // If this midi event belongs to this device then turn it
    // into a MDeviceState.  Otherwise return NULL.
    #if defined (LINUX) || defined (SGI)
    MDeviceState* jlcVcr::deviceState(MDevent& mde)
    {
        MDeviceState * device_state = deviceState();

        if ( !device_state->isNull() &&
            (mde.msglen == 6) &&
            (mde.sysexmsg[1] == 0x15) &&
            (mde.sysexmsg[2] == 0x10)) {
            if (mde.sysexmsg[3] == 0) {
                // Button Event
                switch (mde.sysexmsg[4]) {
                    case kVCRRewindUp:
                        device_state->setButtonState(false, kVCRRewindButtonIndex);
                        break;
                    case kVCRRewindDown:
                        device_state->setButtonState(true, kVCRRewindButtonIndex);
                        break;
                    case kVCRForwardUp:
                        device_state->setButtonState(false, kVCRForwardButtonIndex);
                        break;
                    case kVCRForwardDown:
                        device_state->setButtonState(true, kVCRForwardButtonIndex);
                        break;
                    case kVCRStopUp:
                        device_state->setButtonState(false, kVCRStopButtonIndex);
                        break;
                    case kVCRStopDown:
                        device_state->setButtonState(true, kVCRStopButtonIndex);
                        break;
                    case kVCRPlayUp:
                        device_state->setButtonState(false, kVCRPlayButtonIndex);
                        break;
                    case kVCRPlayDown:
                        device_state->setButtonState(true, kVCRPlayButtonIndex);
                        break;
                    case kVCRRecordUp:
                        device_state->setButtonState(false, kVCRRecordButtonIndex);
                        break;
                    case kVCRRecordDown:
                        device_state->setButtonState(true, kVCRRecordButtonIndex);
                        break;
                }
                device_state->setDevicePosition(0.0, kVCRScrubWheelIndex);
            } else {
                // The scrub wheel moved
                int c = mde.sysexmsg[4];
                if (c & 0x40) { // Check the sign bit
                    c = c - 128;
                }
                device_state->setDevicePosition(c, kVCRScrubWheelIndex);
            }
            return device_state;
        } else {
            return NULL;
        }
    }
    #endif

    //
    // Register the device
    //
    MStatus initializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj, PLUGIN_COMPANY, "3.0", "Any");

        status = plugin.registerDevice("jlcVcr", jlcVcr::creator );
        if (!status) {
            status.perror("registerDevice");
            return status;
        }

        return status;
    }

    MStatus uninitializePlugin( MObject obj )
    {
        MStatus   status;
        MFnPlugin plugin( obj );

        status =  plugin.deregisterDevice( "jlcVcr" );
        if (!status) {
            status.perror("deregisterDevice");
            return status;
        }

        return status;
    }