Question

这是我的异步音频播放器代码。问题是在p.open(...)之后它会立即调用回调函数。 start_stream和stop_stream函数有什么作用？

class AsyncAudioPlayer(object):

    def __init__(self, sampling_frequency, sample_width=2):
        self.p = PyAudio()
        self.buffer = MyBuffer()
        self.stream = self.p.open(format=self.p.get_format_from_width(width=sample_width), rate=sampling_frequency,
                                  output=True, channels=1, stream_callback=self.on_ready_to_play)
        self.started = False

    def close(self):
        self.stream.stop_stream()
        self.stream.close()

    def start(self):
        self.started = True
        self.stream.start_stream()

    def schedule_to_play(self, frame):
        self.buffer.put_frames(frame)
        if not self.started:
            print("Not started. Starting now")
            # self.start()

    def on_ready_to_play(self, in_data, frame_count, time_info, status_flags):
        print("frame count is {}, time_info {}, status flags {}".format(frame_count, time_info, status_flags))
        return self.buffer.get_frames(frame_count), paContinue

Answer 1

来自pyaudio.Stream文档：

开始 - 立即开始播放流。默认为True。通常，没有理由将其设置为False。

因此，您只需稍加修改pyaudio.PyAudio.open来电：

self.stream = self.p.open(format=self.p.get_format_from_width(width=sample_width),
                          rate=sampling_frequency,output=True, channels=1, 
                          stream_callback=self.on_ready_to_play, start=False)

如何在PyAudio中创建流后不立即开始流式传输？

1 个答案: