__init__.py 文件源码

def write(self, audio_data, length):
        # Pass audio_data=None to write silence
        if length == 0:
            return 0

        self.lock()

        p1 = ctypes.c_void_p()
        l1 = lib.DWORD()
        p2 = ctypes.c_void_p()
        l2 = lib.DWORD()
        assert 0 < length <= self._buffer_size
        self._buffer.Lock(self._write_cursor_ring, length, 
            ctypes.byref(p1), l1, ctypes.byref(p2), l2, 0)
        assert length == l1.value + l2.value

        if audio_data:
            ctypes.memmove(p1, audio_data.data, l1.value)
            audio_data.consume(l1.value, self.source_group.audio_format)
            if l2.value:
                ctypes.memmove(p2, audio_data.data, l2.value)
                audio_data.consume(l2.value, self.source_group.audio_format)
        else:
            if self.source_group.audio_format.sample_size == 8:
                c = 0x80
            else:
                c = 0
            ctypes.memset(p1, c, l1.value)
            if l2.value:
                ctypes.memset(p2, c, l2.value)
        self._buffer.Unlock(p1, l1, p2, l2)

        self._write_cursor += length
        self._write_cursor_ring += length
        self._write_cursor_ring %= self._buffer_size
        self.unlock()