Add initial display renderer

This commit is contained in:
Markus Koch 2020-07-05 17:45:45 +02:00
parent c47ce44a44
commit 34592b6060

217
software/webradio.py Normal file
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#!/usr/bin/env python
from PIL import Image, ImageDraw, ImageFont
import asyncio
from mpd import MPDClient
IO_DELAY = (1.0 / 20.0)
MPD_DELAY = 1
class display(object):
def __init__(self):
self.fg = 1
self.width = 128
self.height = 32
self.font_title = ImageFont.truetype('/usr/share/fonts/noto-cjk/NotoSansCJK-Light.ttc', 18)
self.font_info = ImageFont.truetype('/usr/share/fonts/TTF/DejaVuSans.ttf', 10)
self.img = Image.new('1', (self.width, self.height), color = not self.fg)
self.d = ImageDraw.Draw(self.img)
self.dbg = 0
def render(self):
print("render NYI")
def get_image(self):
print("get_image NYI")
def animate(self, ticks):
print("animate NYI")
def get_image(self):
#self.img.save('pil_text_font.png')
#self.img.save("/tmp/wr/frame%d.png" % self.dbg)
print(str(len(self.img.tobytes())))
self.dbg += 1
class display_playback(display):
def __init__(self):
super().__init__()
self.title = ""
self.title_scroll = 0
self.title_scroll_max = -1
self.info = ""
self.syms = [];
def update_text(self, title):
self.title = title
w,h = self.d.textsize(self.title, font=self.font_title)
if (w > self.width):
self.title += ". " # Wraparound for scrolling (pt1)
self.title_scroll_max,h = self.d.textsize(self.title, font=self.font_title)
self.title_scroll = self.title_scroll_max - 10
self.title += self.title # Wraparound for scrolling (pt2)
else:
self.title_scroll = 0
self.title_scroll_max = -1
def update_info(self, info):
self.info = info
def update_syms(self, syms):
self.syms = syms;
def scroll_title(self, amount = 1):
if (self.title_scroll >=0):
self.title_scroll = (self.title_scroll + amount) % self.title_scroll_max
def animate(self, ticks):
self.scroll_title(ticks)
def render(self):
# Clear framebuffer
self.d.rectangle((0,0,self.width,self.height), fill = not self.fg)
# Title
self.d.text((-self.title_scroll,-5), self.title, font=self.font_title, fill=self.fg)
# Playback info
w,h = self.d.textsize(self.info, font=self.font_info)
self.d.text((self.width-w, self.height - 1 - 10 - 1), self.info, font=self.font_info, fill=self.fg)
# Status icons
status = ""
status = status.join([" " + icon + " " for icon in self.syms])
self.d.text((-1, self.height - 1 - 10 - 1), status, font=self.font_info, fill=self.fg)
# TODO: Maybe a progress bar?
#self.d.line((0,15, 127,15), fill=self.fg)
# Serialize
# TODO: Serialize
class display_manager(object):
def __init__(self):
self.tick = 0
self.current_display = None
def set_display(self, disp):
self.current_display = disp
def render(self):
if (self.current_display):
self.current_display.render()
def get_image(self):
if (self.current_display):
self.current_display.get_image()
else:
print("TODO: return empty image")
def animate(self, ticks):
old_tick = self.tick
self.tick += ticks
if (self.current_display):
if (not hasattr(self.current_display, 'ltick')):
self.current_display.ltick = old_tick
self.current_display.animate(self.tick - self.current_display.ltick)
self.current_display.ltick = self.tick
# TODO: Consider also animating inactive screens... Might resolve some glitches when updating text while a screen is in the background (or pass `tick` to update funcs)
class radioserv:
async def io_main(self):
while True:
self.disp_mgr.animate(1)
self.disp_mgr.render()
self.disp_mgr.get_image()
print("x")
await self.io_event.wait()
self.io_event.clear()
async def io_timer_main(self):
while True:
await asyncio.sleep(IO_DELAY)
self.io_event.set()
async def mpd_main(self):
last_title = ""
last_state = ""
last_info = ""
play_icon_map = {"play" : "▶️", "pause" : "ll", "stop" : ""}
while True:
# Query MPD
status = self.mpd.status()
currentsong = self.mpd.currentsong()
# Song title
try:
title = currentsong['title'] + " by " + currentsong['artist']
except:
try:
title = currentsong['file'];
except:
title = ""
if (title != last_title):
self.disp_playback.update_text(title)
last_title = title
# Playback state (icons)
if (status['state'] != last_state):
icons = []
icons.append(play_icon_map.get(status["state"], "?"))
self.disp_playback.update_syms(icons)
last_state = status["state"]
# Playback info
try:
cm, cs = divmod(round(float(status['elapsed'])), 60)
dm, ds = divmod(round(float(status['duration'])), 60)
info = "#%d/%d %d:%02d/%d:%02d" % (int(status['song']) + 1, int(status['playlistlength']), cm, cs, dm, ds)
except:
info = "Stopped"
if (info != last_info):
self.disp_playback.update_info(info)
# Sadly I can't use mpd.idle() here
await asyncio.sleep(MPD_DELAY)
async def main(self):
# Connect to MPD
self.mpd = MPDClient()
self.mpd.connect("yuki", 6600)
# Set up displays
self.disp_playback = display_playback()
self.disp_playback.update_text("Loading...")
self.disp_mgr = display_manager()
self.disp_mgr.set_display(self.disp_playback)
# Create main tasks
self.io_event = asyncio.Event()
io_task = asyncio.create_task(self.io_main())
io_timer_task = asyncio.create_task(self.io_timer_main())
mpd_task = asyncio.create_task(self.mpd_main())
# TODO: Wait for exit condition (shutdown command)
await asyncio.sleep(10)
io_timer_task.cancel()
io_task.cancel()
mpd_task.cancel()
self.mpd.close()
self.mpd.disconnect()
def __init__(self):
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
try:
loop.run_until_complete(self.main())
finally:
loop.run_until_complete(loop.shutdown_asyncgens())
loop.close()
r = radioserv()