Set a new amplification value for a particular equalizer frequency band.
    The new equalizer settings are subsequently applied to a media player by invoking
    L{libvlc_media_player_set_equalizer}().
    The supplied amplification value will be clamped to the -20.0 to +20.0 range.
    @param p_equalizer: valid equalizer handle, must not be NULL.
    @param f_amp: amplification value (-20.0 to 20.0 Hz).
    @param u_band: index, counting from zero, of the frequency band to set.
    @return: zero on success, -1 on error.
    @version: LibVLC 2.2.0 or later.

def libvlc_audio_equalizer_set_amp_at_index(p_equalizer, f_amp, u_band):
    '''Set a new amplification value for a particular equalizer frequency band.
    The new equalizer settings are subsequently applied to a media player by invoking
    L{libvlc_media_player_set_equalizer}().
    The supplied amplification value will be clamped to the -20.0 to +20.0 range.
    @param p_equalizer: valid equalizer handle, must not be NULL.
    @param f_amp: amplification value (-20.0 to 20.0 Hz).
    @param u_band: index, counting from zero, of the frequency band to set.
    @return: zero on success, -1 on error.
    @version: LibVLC 2.2.0 or later.
    '''
    f = _Cfunctions.get('libvlc_audio_equalizer_set_amp_at_index', None) or \
        _Cfunction('libvlc_audio_equalizer_set_amp_at_index', ((1,), (1,), (1,),), None,
                    ctypes.c_int, ctypes.c_void_p, ctypes.c_float, ctypes.c_uint)
    return f(p_equalizer, f_amp, u_band)