procedural.py 文件源码

def _generate_data(self, bytes, offset):
        if self._bytes_per_sample == 1:
            start = offset
            samples = bytes
            bias = 127
            amplitude = 127
            data = (ctypes.c_ubyte * samples)()
        else:
            start = offset >> 1
            samples = bytes >> 1
            bias = 0
            amplitude = 32767
            data = (ctypes.c_short * samples)()
        step = self.frequency * (math.pi * 2) / self.audio_format.sample_rate
        for i in range(samples):
            data[i] = future_round(math.sin(step * (i + start)) * amplitude + bias)
        return data