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import sounddevice as sd
import audioop
import time
frame_rate = 44100
channels = 2
sample_width = 2
class Mixer:
def __init__(self):
self.stream = sd.RawOutputStream(samplerate=frame_rate,
channels=channels,
dtype='int' + str(8*sample_width), # FIXME: ?
latency="high",
blocksize=5000,
callback=self.play_callback,
)
self.open_files = []
def add_file(self, music_file):
if music_file not in self.open_files:
self.open_files.append(music_file)
self.start()
def remove_file(self, music_file):
self.open_files.remove(music_file)
if len(self.open_files) == 0:
self.stop()
def stop(self):
self.stream.stop()
def start(self):
self.stream.start()
def play_callback(self, out_data, frame_count, time_info, status_flags):
out_data_length = len(out_data)
empty_data = b"\0" * out_data_length
data = b"\0" * out_data_length
for open_file in self.open_files:
file_data = open_file.play_callback(out_data_length, frame_count)
if data == empty_data:
data = file_data
elif file_data != empty_data:
data = audioop.add(data, file_data, sample_width)
out_data[:] = data
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