def __init__(self, frames=b''):
    """Create a ChannelFrames instance.

    :param frames: (str) Frames that must be MONO ONLY.

    """
    self._frames = frames

def get_frames(self):
    """Return the frames

        :return: (str) the frames

        """
    return self._frames

def set_frames(self, frames):
    """Set the frames.

        :param frames: (str) the frames to set

        """
    self._frames = frames

def append_silence(self, nframes):
    """Create n frames of silence and append it to the frames.

        :param nframes: (int) the number of frames of silence to append

        """
    nframes = int(nframes)
    if nframes <= 0:
        return False
    self._frames += b' \x00' * nframes
    return True

def prepend_silence(self, nframes):
    """Create n frames of silence and prepend it to the frames.

        :param nframes: (int) the number of frames of silence to append

        """
    nframes = int(nframes)
    if nframes <= 0:
        return False
    self._frames = b' \x00' * nframes + self._frames
    return True

def resample(self, sampwidth, rate, newrate):
    """Resample the frames with a new frame rate.

        :param sampwidth: (int) sample width of the frames.
        :param rate: (int) current frame rate of the frames
        :param newrate: (int) new frame rate of the frames

        """
    if rate != newrate:
        a = AudioFrames(self._frames, sampwidth, 1)
        self._frames = a.resample(rate, newrate)

def change_sampwidth(self, sampwidth, newsampwidth):
    """Change the number of bytes used to encode the frames.

        :param sampwidth: (int) current sample width of the frames.
        (1 for 8 bits, 2 for 16 bits, 4 for 32 bits)
        :param newsampwidth: (int) new sample width of the frames.
        (1 for 8 bits, 2 for 16 bits, 4 for 32 bits)

        """
    if sampwidth != newsampwidth:
        a = AudioFrames(self._frames, sampwidth, 1)
        self._frames = a.change_sampwidth(newsampwidth)

@staticmethod
def get_minval(size, signed=True):
    return AudioFrames().get_minval(size, signed)

@staticmethod
def get_maxval(size, signed=True):
    return AudioFrames().get_maxval(size, signed)