audio: remove layout from audio

Make special format types for planar and interleaved instead of
having a field.
Add enum for audio channel positions
Add some default audio channel layouts
Place the channel layout in the audio format when possible
alsa: place audio channel positions in format
Add sse optimized channel mixing for some common cases
Remove name from port info, it's not mandatory and in the properties
Add direction to port info

src/modules/module-protocol-native/protocol-native.c

@@ -777,8 +777,8 @@ static void port_marshal_info(void *object, struct pw_port_info *info)
 	spa_pod_builder_add(b,
 			    "[",
 			    "i", info->id,
+			    "i", info->direction,
 			    "l", info->change_mask,
-			    "s", info->name,
 			    "i", n_items, NULL);
 
 	for (i = 0; i < n_items; i++) {
@@ -803,8 +803,8 @@ static int port_demarshal_info(void *object, void *data, size_t size)
 	if (spa_pod_parser_get(&prs,
 			"["
 			"i", &info.id,
+			"i", &info.direction,
 			"l", &info.change_mask,
-			"s", &info.name,
 			"i", &props.n_items, NULL) < 0)
 		return -EINVAL;