# Program vlc_radio.py with button control, AHG (2024)
import sys, vlc
from subprocess import run
from time import sleep
from gpiozero import Button
#
ttg = Button(pin=27, pull_up=None,\
active_state=True,bounce_time=0.01) # green push button
ttr = Button(pin=22, pull_up=None,\
active_state=True,bounce_time=0.01) # red push button
tts = Button(pin=25, pull_up=None,\
active_state=True,bounce_time=0.01) # black push button
#
if len(sys.argv) == 1:
    med="http://1940sradio1.co.uk:8100/1"
elif len(sys.argv) == 2: med=sys.argv[1]
else: sys.exit("\nError: too many arguments")
#
# volume of operating system's audio driver:
# ( amixer scontrols  shows names of control elements )
run(["amixer","-q", "sset","PCM","100%"]) # or "HDMI"
#
vi = vlc.Instance("--aout alsa --quiet") # vlc instance
# --aout (audio output module) adummy, alsa, pulse
mp = vi.media_player_new()  # new media player instance
volume = 50                 # initial value for volume
mp.audio_set_volume(volume) # set VLC volume
#
m = vi.media_new(med)       # media name -> instance
mp.set_media(m)             # media instance -> player
mp.play()                   # start media player
#
print(sys.argv[0], med, "quit: Ctrl-C or black button")
print("Volume: green/red button,",mp.audio_get_volume())
#
try:
    while True:
        sleep(0.4)
        if ttg.is_pressed:
            volume=volume+10
            mp.audio_set_volume(volume) # increase vol.
            sleep(0.2)
            print("+ vol., now" ,mp.audio_get_volume())
        if ttr.is_pressed:
            volume=volume-10
            mp.audio_set_volume(volume) # decrease vol.
            sleep(0.1)
            print("- vol., now",mp.audio_get_volume())
        if tts.is_pressed:
            mp.stop() # stop media player
            sleep(0.1)
            sys.exit("\nBlack button pressed."+"\n")
        sta = str(m.get_state())
        if \
(sta != "State.Opening") and (sta != "State.Playing"):
            sys.exit("\nMedium not playing."+"\n")
except KeyboardInterrupt:
    mp.stop() # stop media player
    sys.exit("\nInterrupted by Ctrl-C"+"\n")