fixed MidiPerformance bug where _next_note_index was reset to 0 (#185)

Author: rtjord

backend/data/musicxml/air_on_the_g_string.mid

@@ -25,11 +25,11 @@ def normalize_audio(audio: np.ndarray) -> np.ndarray:
 MAX_DURATION = 600  # Maximum duration of audio buffer in seconds
 
 
-STATED_TEMPO = 220  # Tempo at which the user plans to play in BPM
-SOURCE_TEMPO = 200  # Tempo at which the user actually plays in BPM
-PIECE_NAME = 'greensleeves'  # Name of piece
-PROGAM_NUMBER = 0  # Program number for accompaniment instrument
-SOLO_VOLUME_MULTIPLIER = 1
+STATED_TEMPO = 100  # Tempo at which the user plans to play in BPM
+SOURCE_TEMPO = 110  # Tempo at which the user actually plays in BPM
+PIECE_NAME = 'air_on_the_g_string'  # Name of piece
+PROGAM_NUMBER = 42  # Program number for accompaniment instrument
+SOLO_VOLUME_MULTIPLIER = 0.75
 
 MIDI_SCORE = os.path.join('data', 'midi', PIECE_NAME + '.mid')  # Path to MIDI file
 OUTPUT_DIR = os.path.join('data', 'audio', PIECE_NAME)  # Directory where synthesized audio will be saved

backend/main.py

@@ -187,9 +187,9 @@ def generate_audio(self, output_dir, tempo: float = 120, sample_rate: int = 4410
     # Example usage:
     base_dir = Path(__file__).parent
     score = os.path.join('data', 'midi', 'twinkle_twinkle.mid')
-    output_dir = os.path.join('data', 'audio', 'twinkle_twinkle', '200bpm')
+    output_dir = os.path.join('data', 'audio', 'twinkle_twinkle', '100bpm')
     SAMPLE_RATE = 44100
-    TEMPO = 200
+    TEMPO = 100
 
     try:
         generator = AudioGenerator(score_path=score)

backend/src/audio_generator.py

@@ -162,7 +162,7 @@ def update_score_position(self, position: float):
             Current position in beats (quarter-note units).
         """
         self.score_position = position
-        self._next_note_index = 0
+        # self._next_note_index = 0
 
     def _note_worker(self, midi_note: int, duration_sec: float):
         """
@@ -217,7 +217,7 @@ def _performance_loop(self):
             while (self._next_note_index < len(self.notes) and
                    self.score_position >= self.notes[self._next_note_index][2]):
                 frequency, quarter_duration, quarter_offset = self.notes[self._next_note_index]
-                if (self.score_position - quarter_offset < .1 and self.last_beat is not quarter_offset):
+                if (self.score_position - quarter_offset < 1 and self.last_beat is not quarter_offset):
                     print(
                         f"Playing note at beat {quarter_offset}: {frequency:.2f} Hz, "
                         f"duration {quarter_duration} beats"