import pkg_resources

import _webrtcvad

__author__ = "John Wiseman jjwiseman@gmail.com"
__copyright__ = "Copyright (C) 2016 John Wiseman"
__license__ = "MIT"
__version__ = pkg_resources.get_distribution('webrtcvad').version


class Vad(object):
    def __init__(self, mode=None):
        self._vad = _webrtcvad.create()
        _webrtcvad.init(self._vad)
        if mode is not None:
            self.set_mode(mode)

    def set_mode(self, mode):
        _webrtcvad.set_mode(self._vad, mode)

    def is_speech(self, buf, sample_rate, length=None):
        length = length or int(len(buf) / 2)
        if length * 2 > len(buf):
            raise IndexError(
                'buffer has %s frames, but length argument was %s' % (
                    int(len(buf) / 2.0), length))
        return _webrtcvad.process(self._vad, sample_rate, buf, length)


def valid_rate_and_frame_length(rate, frame_length):
    return _webrtcvad.valid_rate_and_frame_length(rate, frame_length)