__init__.py 文件源码

def _get_video_data(id_, timeout, buffer_=None):
    if buffer_ is None:
        whbi = _get_roi_format(id_)
        sz = whbi[0] * whbi[1]
        if whbi[3] == ASI_IMG_RGB24:
            sz *= 3
        elif whbi[3] == ASI_IMG_RAW16:
            sz *= 2
        buffer_ = bytearray(sz)
    else:
        if not isinstance(buffer_, bytearray):
            raise TypeError('Supplied buffer must be a bytearray')
        sz = len(buffer_)

    cbuf_type = c.c_char * len(buffer_)
    cbuf = cbuf_type.from_buffer(buffer_)
    r = zwolib.ASIGetVideoData(id_, cbuf, sz, int(timeout))

    if r:
        raise zwo_errors[r]
    return buffer_