mpdlistenpy/mpdlisten.py

#!/bin/env python
# This is adapted from mpdlisten.c : https://gist.github.com/sahib/6718139
# 2024 abelliqueux <contact@arthus.net>
#
# MPD client
import musicpd
from math import floor
from os import environ
import signal
import sys
from time import sleep
# Relay
import RPi.GPIO as GPIO
# OLED SSD1306
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import ssd1306
from PIL import Image, ImageDraw

# MPD config
off_delay = 3
mpd_host=None
mpd_port=None
mpd_passwd = None
mpd_states = ['play', 'pause', 'stop', 'unknown']

# Relay GPIO setup
GPIO.setmode(GPIO.BCM)
RELAIS_1_GPIO = 17
GPIO.setup(RELAIS_1_GPIO, GPIO.OUT) # GPIO Assign mode

# SSD1306 setup
serial = i2c(port=1, address=0x3C)
device = ssd1306(serial)

# GUI config
number_of_btn = 4

# TODO: get ctrlc state
ctrlc_pressed = False

mpd_client_status = {'volume': 'N/A',
                     'repeat': 'N/A',
                     'random': 'N/A',
                     'single': 'N/A',
                     'consume': 'N/A',
                     'partition': 'N/A',
                     'playlist': 'N/A',
                     'playlistlength': 'N/A',
                     'mixrampdb': 'N/A',
                     'state': 'N/A',
                     'song': 'N/A',
                     'songid': 'N/A',
                     'time': '0',
                     'elapsed': '0', 
                     'bitrate': 'N/A',
                     'duration': '0',
                     'audio': 'N/A',
                     'nextsong': 'N/A',
                     'nextsongid': 'N/A'
                    }
mpd_client_currentsong = {'file': 'N/A',
                          'last-modified': 'N/A',
                          'format': 'N/A',
                          'artist': 'N/A',
                          'albumartist': 'N/A',
                          'title': 'N/A',
                          'album': 'N/A',
                          'track': 'N/A',
                          'date': 'N/A',
                          'genre': 'N/A',
                          'time': 'N/A',
                          'duration': 'N/A',
                          'pos': 'N/A',
                          'id': 'N/A'}


# Source host, port from env variables
if 'MPD_HOST' in environ:
    mpd_host = environ['MPD_HOST']
    # Extract password if provided
    if len(mpd_host.split('@')) > 1:
        mpd_passwd = mpd_host.split('@')[0]
        mpd_host = mpd_host.split('@')[1]
if 'MPD_PORT' in environ:
    mpd_port = environ['MPD_PORT']

static_ui = None
menu_mode = "playback"


def sectomin(sec:str):
    minute = 0 
    minute = floor(float(sec)/60)
    second = round(float(sec)-minute*60)
    return "{}:{}".format(str(minute), str(second))


def generate_static_ui(mode:str):
    # ~ if mode == "playback":
    btn_width = floor((device.width-3) / 4)
    btn_height = 8
    menu_line_width = 1
    menu_bar_y = device.height - btn_height - menu_line_width
    
    im = Image.new(mode='1', size=(device.width, device.height))
    draw = ImageDraw.Draw(im)
    # TODO: draw static UI only once as a PIL image
    draw.rectangle(device.bounding_box, outline="white", fill="black")
    draw.line([(0, menu_bar_y),(device.width, menu_bar_y)], width=menu_line_width)
    # TODO : use loop
    i = 1
    while i < number_of_btn:
        draw.line([((btn_width+1)*i, menu_bar_y),((btn_width+1)*i, device.height)], width=menu_line_width, fill="white")
        i+=1
    # Draw icons
    draw.regular_polygon(bounding_circle=(((btn_width+1)*0.5), (menu_bar_y + btn_height / 2), 3), n_sides=3, rotation=90, fill="white")
    draw.regular_polygon(bounding_circle=(((btn_width+1)*1.5), (menu_bar_y + btn_height / 2), 3), n_sides=3, rotation=270, fill="white")
    draw.regular_polygon(bounding_circle=(((btn_width+1)*2.5), (menu_bar_y + btn_height / 2), 3), n_sides=4, rotation=0, fill="white")
    draw.regular_polygon(bounding_circle=(((btn_width+1)*3.5), (menu_bar_y + btn_height / 2), 3), n_sides=3, rotation=180, fill="white")
    
    return im


def update_display(device, currentsong, status):
    # We want to display 4 buttons at the bottom of the screen
    btn_width = floor((device.width-3) / 4)
    btn_height = 8
    menu_line_width = 1
    menu_bar_y = device.height - btn_height - menu_line_width
    # Draw dynamic UI
    ui  = static_ui
    draw = ImageDraw.Draw(ui)
    draw.text((10, 2), currentsong['artist'], fill="white")
    draw.text((10, 14), currentsong['title'], fill="white")
    draw.text((10, 26), currentsong['album'], fill="white")
    if 'elapsed' in status:
        draw.text((10, 38), "{}/{}".format(sectomin(status['elapsed']), sectomin(status['duration'])), fill="white")
    device.display(ui)


def main(args):
    previous_sond_id = None
    previous_state = None
    paused_since_seconds = 0
    # MPDclient setup
    client = musicpd.MPDClient()
    if mpd_passwd is not None:
        client.pwd = mpd_passwd
    if mpd_host is not None:
        client.host = mpd_host
    if mpd_port is not None:
        client.port = mpd_port
    client.mpd_timeout = 5
    try:
        client.connect()
    except musicpd.ConnectionError as errorMessage:
        print(repr(errorMessage))
        print("Check host and port are correct.")
    # ~ print(client.status()) # duration, elapsed, volume, repeat, random, single
    # ~ print(client.currentsong()) # artist, title, album
    global static_ui
    static_ui = generate_static_ui(menu_mode)
    while ctrlc_pressed is False:
        mpd_status = client.status()
        if len(mpd_status):
            mpd_client_status = mpd_status
            mpd_client_currentsong = client.currentsong()
            play_state = client.status()['state']
            current_song_id = client.status()['songid']
            if play_state in mpd_states:
                if play_state == 'play':
                    paused_since_seconds = 0
                    if (current_song_id != previous_sond_id) and (previous_state != play_state):
                        print("Play")
                        # Relay on
                        GPIO.output(RELAIS_1_GPIO, GPIO.HIGH)
                if play_state == 'pause':
                    if paused_since_seconds < off_delay:
                        paused_since_seconds += 1
                        print("Paused for {}".format(str(paused_since_seconds)))
                    if (paused_since_seconds >= off_delay) and GPIO.input(RELAIS_1_GPIO):
                        print("Off")
                        # Relay off
                        GPIO.output(RELAIS_1_GPIO, GPIO.LOW)
                if play_state == 'stop' or play_state == 'unknown':
                    previous_sond_id = None
                    paused_since_seconds = 0
                    if previous_state != play_state:
                        print("Stopped")
                        # Relay off
                        GPIO.output(RELAIS_1_GPIO, GPIO.LOW)
            previous_state = play_state
            sleep(1)
        update_display(device, mpd_client_currentsong, mpd_client_status)
    device.cleanup()
    client.disconnect()
    return 0


def signal_handler(sig, frame):
    global ctrlc_pressed
    print('You pressed Ctrl+C!')
    ctrlc_pressed = True
    # ~ sys.exit(0)


if __name__ == '__main__':
    signal.signal(signal.SIGINT, signal_handler)
    sys.exit(main(sys.argv[1:]))