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//
// dolmetschctl
//
//
// Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
// This file is part of dolmetschctl.
//
// dolmetschctl 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 3 of the License, or
// any later version.
//
// dolmetschctl 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 dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//
package controller
import (
"errors"
"fmt"
"strings"
"github.com/scgolang/midi"
)
const (
NOTE_OFFSET_BUTTON = byte(0x00)
NUM_BUTTONS = 4
CC_LED = byte(0xB0)
NOTE_OFFSET_LED = byte(0x00)
NUM_LEDS = 4
LED_OFF = byte(0x00)
LED_ON = byte(0x01)
LED_TOGGLE = byte(0x02)
LED_BLINK_MIN = byte(0x03)
LED_BLINK_MAX = byte(0x7f)
)
type Controller struct {
Dev *midi.Device
}
func openDevice(devices []*midi.Device, prefix string) (d *midi.Device, err error) {
for _, device := range devices {
if strings.HasPrefix(device.Name, prefix) {
d = device
}
}
if d == nil {
return nil, errors.New("could not find device with prefix: " + prefix)
}
return d, d.Open()
}
func NewController(c Config) (*Controller, error) {
devices, err := midi.Devices()
if err != nil {
return nil, err
}
ctrl := &Controller{}
if ctrl.Dev, err = openDevice(devices, c.Dev); err != nil {
return nil, err
}
ctrl.Dev.QueueSize = 100
return ctrl, nil
}
func (c *Controller) Init() error {
return nil
}
func (c *Controller) Shutdown() error {
if c.Dev != nil {
c.Dev.Close()
}
// TODO: also close all subscribed channels
// terminate go-routine started by Init()
return nil
}
func (c *Controller) setLed(num byte, value byte) error {
if num >= NUM_LEDS {
return fmt.Errorf("this controller has only %d leds.", NUM_LEDS)
}
n, err := c.Dev.Write([]byte{CC_LED, NOTE_OFFSET_LED + num, value})
if err != nil {
// reopen device?
return err
}
if n != 3 {
return errors.New("sending LED command failed.")
}
return nil
}
func (c *Controller) LedOff(num byte) error {
return c.setLed(num, LED_OFF)
}
func (c *Controller) LedOn(num byte) error {
return c.setLed(num, LED_ON)
}
func (c *Controller) LedToggle(num byte) error {
return c.setLed(num, LED_TOGGLE)
}
func (c *Controller) LedBlink(num, wait byte) error {
if (wait + LED_BLINK_MIN) > LED_BLINK_MAX {
return fmt.Errorf("blink wait must be between 0 and %d.", LED_BLINK_MAX-LED_BLINK_MIN)
}
return c.setLed(num, wait+LED_BLINK_MIN)
}
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