Simple stopping method works

internal_filesystem/apps/com.micropythonos.musicplayer/assets/audio_player.py

@@ -11,6 +11,7 @@ class AudioPlayer:
     # class-level defaults (shared by every instance)
     _i2s = None          # the I2S object (created once per playback)
     _volume = 50        # 0-100  (100 = full scale)
+    _keep_running = True
 
     @staticmethod
     def find_data_chunk(f):
@@ -67,11 +68,17 @@ class AudioPlayer:
         """Return current volume 0-100."""
         return cls._volume
 
+    #@classmethod
+    def stop_playing():
+        print("stop_playing()")
+        AudioPlayer._keep_running = False
+
     # ------------------------------------------------------------------
     #  Playback entry point (called from a thread)
     # ------------------------------------------------------------------
     @classmethod
     def play_wav(cls, filename):
+        AudioPlayer._keep_running = True
         """Play a large mono 16-bit PCM WAV file with on-the-fly volume."""
         try:
             with open(filename, 'rb') as f:
@@ -124,6 +131,11 @@ class AudioPlayer:
 
                 total = 0
                 while total < data_size:
+                    if total % 51 == 0:
+                        print('.', end='')
+                    if not AudioPlayer._keep_running:
+                        print("_keep_running = False, stopping...")
+                        break
                     to_read = min(chunk_size, data_size - total)
                     raw = bytearray(f.read(to_read))  # mutable for in-place scaling
                     if not raw:

internal_filesystem/apps/com.micropythonos.musicplayer/assets/music_player.py

@@ -1,6 +1,7 @@
 import machine
 import os
 import _thread
+import time
 
 from mpos.apps import Activity, Intent
 import mpos.sdcard
@@ -90,6 +91,8 @@ class FullscreenPlayer(Activity):
             print("Not playing any file...")
         else:
             print("Starting thread to play file {self._filename}")
+            AudioPlayer.stop_playing()
+            time.sleep(1)
             _thread.stack_size(mpos.apps.good_stack_size())
             _thread.start_new_thread(AudioPlayer.play_wav, (self._filename,))