class Player:
update_rate = 50 # 50 ms = 20 updates/sec
levelmeter_lowest = -40 # dB
xfade_duration = 7
def __init__(self, app, trackframes):
self.app = app
self.trackframes = trackframes
self.app.after(self.update_rate, self.tick)
self.stopping = False
self.mixer = StreamMixer([], endless=True)
self.output = Output(self.mixer.samplerate, self.mixer.samplewidth, self.mixer.nchannels, mixing="sequential", queue_size=2)
self.mixed_samples = iter(self.mixer)
self.levelmeter = LevelMeter(rms_mode=False, lowest=self.levelmeter_lowest)
self.output.register_notify_played(self.levelmeter.update)
for tf in self.trackframes:
tf.player = self
player_thread = Thread(target=self._play_sample_in_thread, name="jukebox_sampleplayer")
player_thread.daemon = True
player_thread.start()
def skip(self, trackframe):
if trackframe.state != TrackFrame.state_needtrack and trackframe.stream:
trackframe.stream.close()
trackframe.stream = None
trackframe.display_track(None, None, None, "(next track...)")
trackframe.state = TrackFrame.state_switching
def stop(self):
self.stopping = True
for tf in self.trackframes:
if tf.stream:
tf.stream.close()
tf.stream = None
tf.state = TrackFrame.state_needtrack
self.mixer.close()
self.output.close()
def tick(self):
# the actual decoding and sound playing is done in a background thread
self._levelmeter()
self._load_song()
self._play_song()
self._crossfade()
if not self.stopping:
self.app.after(self.update_rate, self.tick)
def _play_sample_in_thread(self):
"""
This is run in a background thread to avoid GUI interactions interfering with audio output.
"""
while True:
if self.stopping:
break
_, sample = next(self.mixed_samples)
if sample and sample.duration > 0:
self.output.play_sample(sample)
else:
self.levelmeter.reset()
time.sleep(self.update_rate/1000*2) # avoid hogging the cpu while no samples are played
def _levelmeter(self):
self.app.update_levels(self.levelmeter.level_left, self.levelmeter.level_right)
def _load_song(self):
if self.stopping:
return # make sure we don't load new songs when the player is shutting down
for tf in self.trackframes:
if tf.state == TrackFrame.state_needtrack:
track = self.app.pop_playlist_track()
if track:
tf.track = track
tf.state = TrackFrame.state_idle
def _play_song(self):
def start_stream(tf, filename, volume):
def _start_from_thread():
# start loading the track from a thread to avoid gui stutters when loading takes a bit of time
tf.stream = AudiofileToWavStream(filename, hqresample=hqresample)
self.mixer.add_stream(tf.stream, [tf.volumefilter])
tf.playback_started = datetime.datetime.now()
tf.state = TrackFrame.state_playing
tf.volume = volume
tf.state = TrackFrame.state_loading
Thread(target=_start_from_thread, name="stream_loader").start()
for tf in self.trackframes:
if tf.state == TrackFrame.state_playing:
remaining = tf.track_duration - (datetime.datetime.now() - tf.playback_started)
remaining = remaining.total_seconds()
tf.time = datetime.timedelta(seconds=math.ceil(remaining))
if tf.stream.closed and tf.time.total_seconds() <= 0:
self.skip(tf) # stream ended!
elif tf.state == TrackFrame.state_idle:
if tf.xfade_state == TrackFrame.state_xfade_fadingin:
# if we're set to fading in, regardless of other tracks, we start playing as well
start_stream(tf, tf.track["location"], 0)
elif not any(tf for tf in self.trackframes if tf.state in (TrackFrame.state_playing, TrackFrame.state_loading)):
# if there is no other track currently playing (or loading), it's our turn!
start_stream(tf, tf.track["location"], 100)
elif tf.state == TrackFrame.state_switching:
tf.state = TrackFrame.state_needtrack
def _crossfade(self):
for tf in self.trackframes:
# nearing the end of the track? then start a fade out
if tf.state == TrackFrame.state_playing \
and tf.xfade_state == TrackFrame.state_xfade_nofade \
and tf.time.total_seconds() <= self.xfade_duration:
tf.xfade_state = TrackFrame.state_xfade_fadingout
tf.xfade_started = datetime.datetime.now()
tf.xfade_start_volume = tf.volume
# fade in the first other track that is currently idle
for other_tf in self.trackframes:
if tf is not other_tf and other_tf.state == TrackFrame.state_idle:
other_tf.xfade_state = TrackFrame.state_xfade_fadingin
other_tf.xfade_started = datetime.datetime.now()
other_tf.xfade_start_volume = 0
other_tf.volume = 0
break
for tf in self.trackframes:
if tf.xfade_state == TrackFrame.state_xfade_fadingin:
# fading in, slide volume up from 0 to 100%
volume = 100 * (datetime.datetime.now() - tf.xfade_started).total_seconds() / self.xfade_duration
tf.volume = min(volume, 100)
if volume >= 100:
tf.xfade_state = TrackFrame.state_xfade_nofade # fade reached the end
elif tf.xfade_state == TrackFrame.state_xfade_fadingout:
# fading out, slide volume down from what it was at to 0%
fade_progress = (datetime.datetime.now() - tf.xfade_started)
fade_progress = (self.xfade_duration - fade_progress.total_seconds()) / self.xfade_duration
volume = max(0, tf.xfade_start_volume * fade_progress)
tf.volume = max(volume, 0)
if volume <= 0:
tf.xfade_state = TrackFrame.state_xfade_nofade # fade reached the end
def play_sample(self, sample):
def unmute(trf, vol):
if trf:
trf.volume = vol
if sample and sample.duration > 0:
for tf in self.trackframes:
if tf.state == TrackFrame.state_playing:
old_volume = tf.mute_volume(40)
self.mixer.add_sample(sample, lambda mtf=tf, vol=old_volume: unmute(mtf, vol))
break
else:
self.mixer.add_sample(sample)
class LevelGUI(tk.Frame):
def __init__(self, audio_source, master=None):
self.lowest_level = -50
super().__init__(master)
self.master.title("Levels")
self.pbvar_left = tk.IntVar()
self.pbvar_right = tk.IntVar()
pbstyle = ttk.Style()
pbstyle.theme_use("classic")
pbstyle.configure("green.Vertical.TProgressbar", troughcolor="gray", background="light green")
pbstyle.configure("yellow.Vertical.TProgressbar", troughcolor="gray", background="yellow")
pbstyle.configure("red.Vertical.TProgressbar", troughcolor="gray", background="orange")
frame = tk.LabelFrame(self, text="Left")
frame.pack(side=tk.LEFT)
tk.Label(frame, text="dB").pack()
self.pb_left = ttk.Progressbar(frame, orient=tk.VERTICAL, length=300,
maximum=-self.lowest_level, variable=self.pbvar_left,
mode='determinate', style='yellow.Vertical.TProgressbar')
self.pb_left.pack()
frame = tk.LabelFrame(self, text="Right")
frame.pack(side=tk.LEFT)
tk.Label(frame, text="dB").pack()
self.pb_right = ttk.Progressbar(frame, orient=tk.VERTICAL, length=300,
maximum=-self.lowest_level, variable=self.pbvar_right,
mode='determinate', style='yellow.Vertical.TProgressbar')
self.pb_right.pack()
frame = tk.LabelFrame(self, text="Info")
self.info = tk.Label(frame, text="", justify=tk.LEFT)
frame.pack()
self.info.pack(side=tk.TOP)
self.pack()
self.open_audio_file(audio_source)
self.after_idle(self.update)
self.after_idle(self.stream_audio)
def open_audio_file(self, filename_or_stream):
wav = wave.open(filename_or_stream, 'r')
self.samplewidth = wav.getsampwidth()
self.samplerate = wav.getframerate()
self.nchannels = wav.getnchannels()
self.samplestream = iter(SampleStream(wav, self.samplerate // 10))
self.levelmeter = LevelMeter(rms_mode=False, lowest=self.lowest_level)
self.audio_out = Output(self.samplerate, self.samplewidth, self.nchannels, mixing="sequential", queue_size=3)
print("Audio API used:", self.audio_out.audio_api)
if not self.audio_out.supports_streaming:
raise RuntimeError("need api that supports streaming")
self.audio_out.register_notify_played(self.levelmeter.update)
filename = filename_or_stream if isinstance(filename_or_stream, str) else "<stream>"
info = "Source:\n{}\n\nRate: {:g} Khz\nBits: {}\nChannels: {}"\
.format(filename, self.samplerate/1000, 8*self.samplewidth, self.nchannels)
self.info.configure(text=info)
def stream_audio(self):
try:
sample = next(self.samplestream)
self.audio_out.play_sample(sample)
self.after(20, self.stream_audio)
except StopIteration:
self.audio_out.close()
def update(self):
if not self.audio_out.still_playing():
self.pbvar_left.set(0)
self.pbvar_right.set(0)
print("done!")
return
left, peak_l = self.levelmeter.level_left, self.levelmeter.peak_left
right, peak_r = self.levelmeter.level_right, self.levelmeter.peak_right
self.pbvar_left.set(left-self.lowest_level)
self.pbvar_right.set(right-self.lowest_level)
if left > -3:
self.pb_left.configure(style="red.Vertical.TProgressbar")
elif left > -6:
self.pb_left.configure(style="yellow.Vertical.TProgressbar")
else:
self.pb_left.configure(style="green.Vertical.TProgressbar")
if right > -3:
self.pb_right.configure(style="red.Vertical.TProgressbar")
elif right > -6:
self.pb_right.configure(style="yellow.Vertical.TProgressbar")
else:
self.pb_right.configure(style="green.Vertical.TProgressbar")
self.after(1000//update_rate, self.update)
