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Music Player app: scale volume

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This commit is contained in:
Thomas Farstrike
2025-10-28 12:16:02 +01:00
parent b056c77929
commit 4afcd04782
2 changed files with 14 additions and 13 deletions
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internal_filesystem/apps/com.micropythonos.musicplayer/assets/audio_player.py
+10 -9
View File
@@ -1,3 +1,4 @@
import machine
import os
import time
@@ -96,13 +97,12 @@ class AudioPlayer:
ibuf=32000
)
except Exception as e:
print("Warning: error initializing I2S audio device, simulating playback...")
print(f"Warning: simulating playback due to error initializing I2S audio device: {e}")
print(f"Playing {data_size} bytes (vol {cls._volume}%) …")
f.seek(data_start)
chunk_size = 4096 # 4 KB → safe on ESP32
scale = cls._volume / 100.0 # float 0.0-1.0
total = 0
while total < data_size:
@@ -112,13 +112,14 @@ class AudioPlayer:
break
# ---- on-the-fly volume scaling (16-bit little-endian) ----
if scale < 1.0:
# convert bytes → array of signed ints → scale → back to bytes
import array
samples = array.array('h', raw) # 'h' = signed short
for i in range(len(samples)):
samples[i] = int(samples[i] * scale)
raw = samples.tobytes()
scale = cls._volume / 100.0 # float 0.0-1.0
if scale < 0.9:
scaled = bytearray(len(raw))
for i in range(0, len(raw), 2):
sample = int.from_bytes(raw[i:i+2], 'little', True)
sample = int(sample * scale)
scaled[i:i+2] = sample.to_bytes(2, 'little', True)
raw = bytes(scaled)
# ---------------------------------------------------------
if cls._i2s:
internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py
+4 -4
View File
@@ -59,17 +59,17 @@ class FullscreenPlayer(Activity):
self._filename = self.getIntent().extras.get("filename")
qr_screen = lv.obj()
self._slider_label=lv.label(qr_screen)
self._slider_label.set_text(f"Volume: 100%")
self._slider_label.set_text(f"Volume: {AudioPlayer.get_volume()}%")
self._slider_label.align(lv.ALIGN.TOP_MID,0,lv.pct(4))
self._slider=lv.slider(qr_screen)
self._slider.set_range(0,100)
self._slider.set_value(100,False)
self._slider.set_width(lv.pct(80))
self._slider.set_value(AudioPlayer.get_volume(), False)
self._slider.set_width(lv.pct(90))
self._slider.align_to(self._slider_label,lv.ALIGN.OUT_BOTTOM_MID,0,10)
def volume_slider_changed(e):
volume_int = self._slider.get_value()
self._slider_label.set_text(f"Volume: {volume_int}%")
# TODO: set volume using AudioPlayer.set_volume(volume_int)
AudioPlayer.set_volume(volume_int)
self._slider.add_event_cb(volume_slider_changed,lv.EVENT.VALUE_CHANGED,None)
self._filename_label = lv.label(qr_screen)
self._filename_label.align(lv.ALIGN.CENTER,0,0)