How to use the pulsectl._pulsectl.PA_CHANNEL_MAP function in pulsectl

def struct_from_value( cls, name, volume,
			channel_list=None, mute=False, device=None ):
		'Same arguments as with class instance init.'
		chan_map = c.PA_CHANNEL_MAP()
		if not channel_list: c.pa.channel_map_init_mono(chan_map)
		else:
			if not is_str(channel_list):
				channel_list = b','.join(map(c.force_bytes, channel_list))
			c.pa.channel_map_parse(chan_map, channel_list)
		if not isinstance(volume, PulseVolumeInfo):
			volume = PulseVolumeInfo(volume, chan_map.channels)
		struct = c.PA_EXT_STREAM_RESTORE_INFO(
			name=c.force_bytes(name),
			mute=int(bool(mute)), device=c.force_bytes(device),
			channel_map=chan_map, volume=volume.to_struct() )
		return struct

pa_proplist_from_string=([c_str_p], POINTER(PA_PROPLIST)),
		pa_proplist_iterate=([POINTER(PA_PROPLIST), POINTER(c_void_p)], c_str_p),
		pa_proplist_gets=([POINTER(PA_PROPLIST), c_str_p], c_str_p),
		pa_proplist_free=[POINTER(PA_PROPLIST)],

		pa_channel_map_init_mono=(
			[POINTER(PA_CHANNEL_MAP)], (POINTER(PA_CHANNEL_MAP), 'not_null') ),
		pa_channel_map_init_stereo=(
			[POINTER(PA_CHANNEL_MAP)], (POINTER(PA_CHANNEL_MAP), 'not_null') ),
		pa_channel_map_snprint=([c_str_p, c_int, POINTER(PA_CHANNEL_MAP)], c_str_p),
		pa_channel_map_parse=(
			[POINTER(PA_CHANNEL_MAP), c_str_p], (POINTER(PA_CHANNEL_MAP), 'not_null') ),

		pa_stream_new_with_proplist=(
			[ POINTER(PA_CONTEXT), c_str_p,
				POINTER(PA_SAMPLE_SPEC), POINTER(PA_CHANNEL_MAP), POINTER(PA_PROPLIST) ],
			POINTER(PA_STREAM) ),
		pa_stream_set_monitor_stream=([POINTER(PA_STREAM), c_uint32], 'int_check_ge0'),
		pa_stream_set_read_callback=[POINTER(PA_STREAM), PA_STREAM_REQUEST_CB_T, c_void_p],
		pa_stream_connect_record=(
			[POINTER(PA_STREAM), c_str_p, POINTER(PA_BUFFER_ATTR), c_int], 'int_check_ge0' ),
		pa_stream_unref=[POINTER(PA_STREAM)],
		pa_stream_peek=(
			[POINTER(PA_STREAM), POINTER(c_void_p), POINTER(c_int)], 'int_check_ge0' ),
		pa_stream_drop=([POINTER(PA_STREAM)], 'int_check_ge0'),
		pa_stream_disconnect=([POINTER(PA_STREAM)], 'int_check_ge0') )

	class CallError(Exception): pass


	def __init__(self):
		p = CDLL(ctypes.util.find_library('libpulse') or 'libpulse.so.0')

('resample_method', c_char_p),
		('driver', c_char_p),
		('mute', c_int),
		('proplist', POINTER(PA_PROPLIST)),
		('corked', c_int),
		('has_volume', c_int),
		('volume_writable', c_int),
	]

class PA_SINK_INFO(Structure):
	_fields_ = [
		('name', c_char_p),
		('index', c_uint32),
		('description', c_char_p),
		('sample_spec', PA_SAMPLE_SPEC),
		('channel_map', PA_CHANNEL_MAP),
		('owner_module', c_uint32),
		('volume', PA_CVOLUME),
		('mute', c_int),
		('monitor_source', c_uint32),
		('monitor_source_name', c_char_p),
		('latency', PA_USEC_T),
		('driver', c_char_p),
		('flags', c_int),
		('proplist', POINTER(PA_PROPLIST)),
		('configured_latency', PA_USEC_T),
		('base_volume', c_int),
		('state', c_int),
		('n_volume_steps', c_int),
		('card', c_uint32),
		('n_ports', c_uint32),
		('ports', POINTER(POINTER(PA_PORT_INFO))),