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Improved fading

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fade() takes an optional parameter, fade_seconds
fading is now logarithmic
This commit is contained in:
Keith Edmunds 2023-10-17 22:38:57 +01:00
parent 2ca2471f5e
commit d2444159ac
2 changed files with 17 additions and 21 deletions
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5
app/config.py
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@ -53,8 +53,9 @@ class Config(object):
FADE_CURVE_BACKGROUND = "lightyellow"
FADE_CURVE_FOREGROUND = "blue"
FADE_CURVE_MS_BEFORE_FADE = 5000
FADE_STEPS = 20
FADE_TIME = 3000
FADEOUT_DB = -10
FADEOUT_SECONDS = 5
FADEOUT_STEPS_PER_SECOND = 5
HIDE_AFTER_PLAYING_OFFSET = 5000
INFO_TAB_TITLE_LENGTH = 15
LAST_PLAYED_TODAY_STRING = "Today"

33
app/music.py
View File

@ -19,9 +19,10 @@ lock = threading.Lock()
class FadeTrack(QRunnable):
def __init__(self, player: vlc.MediaPlayer) -> None:
def __init__(self, player: vlc.MediaPlayer, fade_seconds) -> None:
super().__init__()
self.player = player
self.fade_seconds = fade_seconds
def run(self):
"""
@ -31,24 +32,18 @@ class FadeTrack(QRunnable):
if not self.player:
return
fade_time = Config.FADE_TIME / 1000
steps = Config.FADE_STEPS
sleep_time = fade_time / steps
original_volume = self.player.audio_get_volume()
# Reduce volume logarithmically
total_steps = self.fade_seconds * Config.FADEOUT_STEPS_PER_SECOND
db_reduction_per_step = Config.FADEOUT_DB / total_steps
reduction_factor_per_step = pow(10, (db_reduction_per_step / 20))
# We reduce volume by one mesure first, then by two measures,
# then three, and so on.
# The sum of the arithmetic sequence 1, 2, 3, ..n is
# (n**2 + n) / 2
total_measures_count = (steps**2 + steps) / 2
volume = self.player.audio_get_volume()
measures_to_reduce_by = 0
for i in range(1, steps + 1):
measures_to_reduce_by += i
volume_factor = 1 - (measures_to_reduce_by / total_measures_count)
self.player.audio_set_volume(int(original_volume * volume_factor))
sleep(sleep_time)
for i in range(1, total_steps + 1):
self.player.audio_set_volume(
int(volume * pow(reduction_factor_per_step, i))
)
sleep(1 / Config.FADEOUT_STEPS_PER_SECOND)
self.player.stop()
log.debug(f"Releasing player {self.player=}")
@ -65,7 +60,7 @@ class Music:
self.player = None
self.max_volume = Config.VOLUME_VLC_DEFAULT
def fade(self) -> None:
def fade(self, fade_seconds: int = Config.FADEOUT_SECONDS) -> None:
"""
Fade the currently playing track.
@ -86,7 +81,7 @@ class Music:
self.player = None
pool = QThreadPool.globalInstance()
fader = FadeTrack(p)
fader = FadeTrack(p, fade_seconds=fade_seconds)
pool.start(fader)
def get_position(self) -> Optional[float]: