Adding upstream version 0.3.65.upstream/0.3.65upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 2817 insertions, 0 deletions

diff --git a/src/modules/module-client-node/v0/client-node.c b/src/modules/module-client-node/v0/client-node.c
new file mode 100644
index 0000000..e70a7c2
--- /dev/null
+++ b/src/modules/module-client-node/v0/client-node.c
@@ -0,0 +1,1447 @@
+/* PipeWire
+ *
+ * Copyright © 2015 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <string.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dlfcn.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/pod/filter.h>
+#include <spa/utils/keys.h>
+
+#define PW_ENABLE_DEPRECATED
+
+#include "pipewire/pipewire.h"
+#include "pipewire/private.h"
+
+#include "pipewire/context.h"
+#include "modules/spa/spa-node.h"
+#include "client-node.h"
+#include "transport.h"
+
+PW_LOG_TOPIC_EXTERN(mod_topic);
+#define PW_LOG_TOPIC_DEFAULT mod_topic
+
+/** \cond */
+
+#define MAX_INPUTS       64
+#define MAX_OUTPUTS      64
+
+#define MAX_BUFFERS      64
+
+#define CHECK_IN_PORT_ID(this,d,p)       ((d) == SPA_DIRECTION_INPUT && (p) < MAX_INPUTS)
+#define CHECK_OUT_PORT_ID(this,d,p)      ((d) == SPA_DIRECTION_OUTPUT && (p) < MAX_OUTPUTS)
+#define CHECK_PORT_ID(this,d,p)          (CHECK_IN_PORT_ID(this,d,p) || CHECK_OUT_PORT_ID(this,d,p))
+#define CHECK_FREE_IN_PORT(this,d,p)     (CHECK_IN_PORT_ID(this,d,p) && !(this)->in_ports[p].valid)
+#define CHECK_FREE_OUT_PORT(this,d,p)    (CHECK_OUT_PORT_ID(this,d,p) && !(this)->out_ports[p].valid)
+#define CHECK_FREE_PORT(this,d,p)        (CHECK_FREE_IN_PORT (this,d,p) || CHECK_FREE_OUT_PORT (this,d,p))
+#define CHECK_IN_PORT(this,d,p)          (CHECK_IN_PORT_ID(this,d,p) && (this)->in_ports[p].valid)
+#define CHECK_OUT_PORT(this,d,p)         (CHECK_OUT_PORT_ID(this,d,p) && (this)->out_ports[p].valid)
+#define CHECK_PORT(this,d,p)             (CHECK_IN_PORT (this,d,p) || CHECK_OUT_PORT (this,d,p))
+
+#define GET_IN_PORT(this,p)	(&this->in_ports[p])
+#define GET_OUT_PORT(this,p)	(&this->out_ports[p])
+#define GET_PORT(this,d,p)	(d == SPA_DIRECTION_INPUT ? GET_IN_PORT(this,p) : GET_OUT_PORT(this,p))
+
+#define CHECK_PORT_BUFFER(this,b,p)      (b < p->n_buffers)
+
+extern uint32_t pw_protocol_native0_type_from_v2(struct pw_impl_client *client, uint32_t type);
+extern uint32_t pw_protocol_native0_name_to_v2(struct pw_impl_client *client, const char *name);
+
+struct mem {
+	uint32_t id;
+	int ref;
+	int fd;
+	uint32_t type;
+	uint32_t flags;
+};
+
+struct buffer {
+	struct spa_buffer *outbuf;
+	struct spa_buffer buffer;
+	struct spa_meta metas[4];
+	struct spa_data datas[4];
+	bool outstanding;
+	uint32_t memid;
+};
+
+struct port {
+	uint32_t id;
+	enum spa_direction direction;
+
+	bool valid;
+	struct spa_port_info info;
+	struct pw_properties *properties;
+
+	bool have_format;
+	uint32_t n_params;
+	struct spa_pod **params;
+	struct spa_io_buffers *io;
+
+	uint32_t n_buffers;
+	struct buffer buffers[MAX_BUFFERS];
+};
+
+struct node {
+	struct spa_node node;
+
+	struct impl *impl;
+
+	struct spa_log *log;
+	struct spa_loop *data_loop;
+	struct spa_system *data_system;
+
+	struct spa_hook_list hooks;
+	struct spa_callbacks callbacks;
+
+	struct spa_io_position *position;
+
+	struct pw_resource *resource;
+
+	struct spa_source data_source;
+	int writefd;
+
+	struct spa_node_info info;
+
+	uint32_t n_inputs;
+	uint32_t n_outputs;
+	struct port in_ports[MAX_INPUTS];
+	struct port out_ports[MAX_OUTPUTS];
+
+	uint32_t n_params;
+	struct spa_pod **params;
+
+	uint32_t seq;
+	uint32_t init_pending;
+};
+
+struct impl {
+	struct pw_impl_client_node0 this;
+
+	bool client_reuse;
+
+	struct pw_context *context;
+
+	struct node node;
+
+	struct pw_client_node0_transport *transport;
+
+	struct spa_hook node_listener;
+	struct spa_hook resource_listener;
+	struct spa_hook object_listener;
+
+	struct pw_array mems;
+
+	int fds[2];
+	int other_fds[2];
+
+	uint32_t input_ready;
+	bool out_pending;
+};
+
+/** \endcond */
+
+static struct mem *ensure_mem(struct impl *impl, int fd, uint32_t type, uint32_t flags)
+{
+	struct mem *m, *f = NULL;
+
+	pw_array_for_each(m, &impl->mems) {
+		if (m->ref <= 0)
+			f = m;
+		else if (m->fd == fd)
+			goto found;
+	}
+
+	if (f == NULL) {
+		m = pw_array_add(&impl->mems, sizeof(struct mem));
+		m->id = pw_array_get_len(&impl->mems, struct mem) - 1;
+		m->ref = 0;
+	}
+	else {
+		m = f;
+	}
+	m->fd = fd;
+	m->type = type;
+	m->flags = flags;
+
+	pw_client_node0_resource_add_mem(impl->node.resource,
+					m->id,
+					type,
+					m->fd,
+					m->flags);
+      found:
+	m->ref++;
+	return m;
+}
+
+
+static int clear_buffers(struct node *this, struct port *port)
+{
+	uint32_t i, j;
+	struct impl *impl = this->impl;
+
+	for (i = 0; i < port->n_buffers; i++) {
+		struct buffer *b = &port->buffers[i];
+		struct mem *m;
+
+		spa_log_debug(this->log, "node %p: clear buffer %d", this, i);
+
+		for (j = 0; j < b->buffer.n_datas; j++) {
+			struct spa_data *d = &b->datas[j];
+
+			if (d->type == SPA_DATA_DmaBuf ||
+			    d->type == SPA_DATA_MemFd) {
+				uint32_t id;
+
+				id = SPA_PTR_TO_UINT32(b->buffer.datas[j].data);
+				m = pw_array_get_unchecked(&impl->mems, id, struct mem);
+				m->ref--;
+			}
+		}
+		m = pw_array_get_unchecked(&impl->mems, b->memid, struct mem);
+		m->ref--;
+	}
+	port->n_buffers = 0;
+	return 0;
+}
+
+static void emit_port_info(struct node *this, struct port *port)
+{
+	spa_node_emit_port_info(&this->hooks,
+				port->direction, port->id, &port->info);
+}
+
+static int impl_node_add_listener(void *object,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct node *this = object;
+	struct spa_hook_list save;
+	uint32_t i;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
+
+	for (i = 0; i < MAX_INPUTS; i++) {
+		if (this->in_ports[i].valid)
+			emit_port_info(this, &this->in_ports[i]);
+	}
+	for (i = 0; i < MAX_OUTPUTS; i++) {
+		if (this->out_ports[i].valid)
+			emit_port_info(this, &this->out_ports[i]);
+	}
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int impl_node_enum_params(void *object, int seq,
+				 uint32_t id, uint32_t start, uint32_t num,
+				 const struct spa_pod *filter)
+{
+	struct node *this = object;
+	uint8_t buffer[1024];
+	struct spa_pod_builder b = { 0 };
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+	bool found = false;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	result.id = id;
+	result.next = 0;
+
+	while (true) {
+		struct spa_pod *param;
+
+		result.index = result.next++;
+		if (result.index >= this->n_params)
+			break;
+
+		param = this->params[result.index];
+
+		if (param == NULL || !spa_pod_is_object_id(param, id))
+			continue;
+
+		found = true;
+
+		if (result.index < start)
+			continue;
+
+		spa_pod_builder_init(&b, buffer, sizeof(buffer));
+		if (spa_pod_filter(&b, &result.param, param, filter) != 0)
+			continue;
+
+		pw_log_debug("%p: %d param %u", this, seq, result.index);
+		spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+		if (++count == num)
+			break;
+	}
+	return found ? 0 : -ENOENT;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	if (this->resource == NULL)
+		return -EIO;
+
+	pw_client_node0_resource_set_param(this->resource, this->seq, id, flags, param);
+
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	struct node *this = object;
+	int res = 0;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch(id) {
+	case SPA_IO_Position:
+		this->position = data;
+		break;
+	default:
+		res = -ENOTSUP;
+		break;
+	}
+	return res;
+}
+
+static inline void do_flush(struct node *this)
+{
+	if (spa_system_eventfd_write(this->data_system, this->writefd, 1) < 0)
+		spa_log_warn(this->log, "node %p: error flushing : %s", this, strerror(errno));
+
+}
+
+static int send_clock_update(struct node *this)
+{
+	struct pw_impl_client *client = this->resource->client;
+	uint32_t type = pw_protocol_native0_name_to_v2(client, SPA_TYPE_INFO_NODE_COMMAND_BASE "ClockUpdate");
+	struct timespec ts;
+	int64_t now;
+
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	now = SPA_TIMESPEC_TO_NSEC(&ts);
+	pw_log_trace("%p: now %"PRIi64, this, now);
+
+	struct spa_command_node0_clock_update cu =
+		SPA_COMMAND_NODE0_CLOCK_UPDATE_INIT(type,
+						SPA_COMMAND_NODE0_CLOCK_UPDATE_TIME |
+						SPA_COMMAND_NODE0_CLOCK_UPDATE_SCALE |
+						SPA_COMMAND_NODE0_CLOCK_UPDATE_STATE |
+						SPA_COMMAND_NODE0_CLOCK_UPDATE_LATENCY,   /* change_mask */
+						SPA_USEC_PER_SEC,       /* rate */
+						now / SPA_NSEC_PER_USEC,       /* ticks */
+						now,       /* monotonic_time */
+						0,       /* offset */
+						(1 << 16) | 1,   /* scale */
+						SPA_CLOCK0_STATE_RUNNING, /* state */
+						SPA_COMMAND_NODE0_CLOCK_UPDATE_FLAG_LIVE,       /* flags */
+						0);      /* latency */
+
+	pw_client_node0_resource_command(this->resource, this->seq, (const struct spa_command*)&cu);
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	if (this->resource == NULL)
+		return -EIO;
+
+	if (SPA_NODE_COMMAND_ID(command) == SPA_NODE_COMMAND_Start) {
+		send_clock_update(this);
+	}
+
+	pw_client_node0_resource_command(this->resource, this->seq, command);
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int
+impl_node_set_callbacks(void *object,
+			const struct spa_node_callbacks *callbacks,
+			void *data)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	this->callbacks = SPA_CALLBACKS_INIT(callbacks, data);
+
+	return 0;
+}
+
+static int
+impl_node_sync(void *object, int seq)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	pw_log_debug("%p: sync %p", this, this->resource);
+
+	if (this->resource == NULL)
+		return -EIO;
+
+	this->init_pending = SPA_RESULT_RETURN_ASYNC(this->seq++);
+
+	return this->init_pending;
+}
+
+
+extern struct spa_pod *pw_protocol_native0_pod_from_v2(struct pw_impl_client *client, const struct spa_pod *pod);
+extern int pw_protocol_native0_pod_to_v2(struct pw_impl_client *client, const struct spa_pod *pod,
+		struct spa_pod_builder *b);
+
+static void
+do_update_port(struct node *this,
+	       enum spa_direction direction,
+	       uint32_t port_id,
+	       uint32_t change_mask,
+	       uint32_t n_params,
+	       const struct spa_pod **params,
+	       const struct spa_port_info *info)
+{
+	struct port *port;
+
+	port = GET_PORT(this, direction, port_id);
+
+	if (!port->valid) {
+		spa_log_debug(this->log, "node %p: adding port %d, direction %d",
+				this, port_id, direction);
+		port->id = port_id;
+		port->direction = direction;
+		port->have_format = false;
+		port->valid = true;
+
+		if (direction == SPA_DIRECTION_INPUT)
+			this->n_inputs++;
+		else
+			this->n_outputs++;
+	}
+
+	if (change_mask & PW_CLIENT_NODE0_PORT_UPDATE_PARAMS) {
+		uint32_t i;
+
+		port->have_format = false;
+
+		spa_log_debug(this->log, "node %p: port %u update %d params", this, port_id, n_params);
+		for (i = 0; i < port->n_params; i++)
+			free(port->params[i]);
+		port->n_params = n_params;
+		if (port->n_params == 0) {
+			free(port->params);
+			port->params = NULL;
+		} else {
+			void *p;
+			p = pw_reallocarray(port->params, port->n_params, sizeof(struct spa_pod *));
+			if (p == NULL) {
+				pw_log_error("%p: port %u can't realloc: %m", this, port_id);
+				free(port->params);
+				port->n_params = 0;
+			}
+			port->params = p;
+		}
+		for (i = 0; i < port->n_params; i++) {
+			port->params[i] = params[i] ?
+				pw_protocol_native0_pod_from_v2(this->resource->client, params[i]) : NULL;
+
+			if (port->params[i] && spa_pod_is_object_id(port->params[i], SPA_PARAM_Format))
+				port->have_format = true;
+		}
+	}
+
+	if (change_mask & PW_CLIENT_NODE0_PORT_UPDATE_INFO) {
+		pw_properties_free(port->properties);
+		port->properties = NULL;
+		port->info.props = NULL;
+		port->info.n_params = 0;
+		port->info.params = NULL;
+
+		if (info) {
+			port->info = *info;
+			if (info->props) {
+				port->properties = pw_properties_new_dict(info->props);
+				port->info.props = &port->properties->dict;
+			}
+		}
+		spa_node_emit_port_info(&this->hooks, direction, port_id, info);
+	}
+}
+
+static void
+clear_port(struct node *this,
+	   struct port *port, enum spa_direction direction, uint32_t port_id)
+{
+	do_update_port(this,
+		       direction,
+		       port_id,
+		       PW_CLIENT_NODE0_PORT_UPDATE_PARAMS |
+		       PW_CLIENT_NODE0_PORT_UPDATE_INFO, 0, NULL, NULL);
+	clear_buffers(this, port);
+}
+
+static void do_uninit_port(struct node *this, enum spa_direction direction, uint32_t port_id)
+{
+	struct port *port;
+
+	spa_log_debug(this->log, "node %p: removing port %d", this, port_id);
+
+	if (direction == SPA_DIRECTION_INPUT) {
+		port = GET_IN_PORT(this, port_id);
+		this->n_inputs--;
+	} else {
+		port = GET_OUT_PORT(this, port_id);
+		this->n_outputs--;
+	}
+	clear_port(this, port, direction, port_id);
+	port->valid = false;
+	spa_node_emit_port_info(&this->hooks, direction, port_id, NULL);
+}
+
+static int
+impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+		const struct spa_dict *props)
+{
+	struct node *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_FREE_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+	clear_port(this, port, direction, port_id);
+
+	return 0;
+}
+
+static int
+impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	do_uninit_port(this, direction, port_id);
+
+	return 0;
+}
+
+static int
+impl_node_port_enum_params(void *object, int seq,
+			   enum spa_direction direction, uint32_t port_id,
+			   uint32_t id, uint32_t start, uint32_t num,
+			   const struct spa_pod *filter)
+{
+	struct node *this = object;
+	struct port *port;
+	uint8_t buffer[1024];
+	struct spa_pod_builder b = { 0 };
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+	bool found = false;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	pw_log_debug("%p: %d port %d.%d %u %u %u", this, seq,
+			direction, port_id, id, start, num);
+
+	result.id = id;
+	result.next = 0;
+
+	while (true) {
+		struct spa_pod *param;
+
+		result.index = result.next++;
+		if (result.index >= port->n_params)
+			break;
+
+		param = port->params[result.index];
+
+		if (param == NULL || !spa_pod_is_object_id(param, id))
+			continue;
+
+		found = true;
+
+		if (result.index < start)
+			continue;
+
+		spa_pod_builder_init(&b, buffer, sizeof(buffer));
+		if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+			continue;
+
+		pw_log_debug("%p: %d param %u", this, seq, result.index);
+		spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+		if (++count == num)
+			break;
+	}
+	return found ? 0 : -ENOENT;
+}
+
+static int
+impl_node_port_set_param(void *object,
+			 enum spa_direction direction, uint32_t port_id,
+			 uint32_t id, uint32_t flags,
+			 const struct spa_pod *param)
+{
+	struct node *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	if (this->resource == NULL)
+		return -EIO;
+
+	pw_client_node0_resource_port_set_param(this->resource,
+					       this->seq,
+					       direction, port_id,
+					       id, flags,
+					       param);
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int
+impl_node_port_set_io(void *object,
+		      enum spa_direction direction,
+		      uint32_t port_id,
+		      uint32_t id,
+		      void *data, size_t size)
+{
+	struct node *this = object;
+	struct impl *impl;
+	struct pw_memblock *mem;
+	struct mem *m;
+	uint32_t memid, mem_offset, mem_size;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	impl = this->impl;
+
+	spa_log_debug(this->log, "node %p: port %d.%d set io %d %p", this,
+			direction, port_id, id, data);
+
+	if (id == SPA_IO_Buffers) {
+		struct port *port = GET_PORT(this, direction, port_id);
+		port->io = data;
+	}
+
+	if (this->resource == NULL)
+		return -EIO;
+
+
+	if (data) {
+		if ((mem = pw_mempool_find_ptr(impl->context->pool, data)) == NULL)
+			return -EINVAL;
+
+		mem_offset = SPA_PTRDIFF(data, mem->map->ptr);
+		mem_size = mem->size;
+		if (mem_size - mem_offset < size)
+			return -EINVAL;
+
+		mem_offset += mem->map->offset;
+		m = ensure_mem(impl, mem->fd, SPA_DATA_MemFd, mem->flags);
+		memid = m->id;
+	}
+	else {
+		memid = SPA_ID_INVALID;
+		mem_offset = mem_size = 0;
+	}
+
+	pw_client_node0_resource_port_set_io(this->resource,
+					    this->seq,
+					    direction, port_id,
+					    id,
+					    memid,
+					    mem_offset, mem_size);
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int
+impl_node_port_use_buffers(void *object,
+			   enum spa_direction direction,
+			   uint32_t port_id,
+			   uint32_t flags,
+			   struct spa_buffer **buffers,
+			   uint32_t n_buffers)
+{
+	struct node *this = object;
+	struct impl *impl;
+	struct port *port;
+	uint32_t i, j;
+	struct pw_client_node0_buffer *mb;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	impl = this->impl;
+	spa_log_debug(this->log, "node %p: use buffers %p %u", this, buffers, n_buffers);
+
+	port = GET_PORT(this, direction, port_id);
+
+	if (!port->have_format)
+		return -EIO;
+
+	clear_buffers(this, port);
+
+	if (n_buffers > 0) {
+		mb = alloca(n_buffers * sizeof(struct pw_client_node0_buffer));
+	} else {
+		mb = NULL;
+	}
+
+	port->n_buffers = n_buffers;
+
+	if (this->resource == NULL)
+		return -EIO;
+
+	for (i = 0; i < n_buffers; i++) {
+		struct buffer *b = &port->buffers[i];
+		struct pw_memblock *mem;
+		struct mem *m;
+		size_t data_size;
+		void *baseptr;
+
+		b->outbuf = buffers[i];
+		memcpy(&b->buffer, buffers[i], sizeof(struct spa_buffer));
+		b->buffer.datas = b->datas;
+		b->buffer.metas = b->metas;
+
+		if (buffers[i]->n_metas > 0)
+			baseptr = buffers[i]->metas[0].data;
+		else if (buffers[i]->n_datas > 0)
+			baseptr = buffers[i]->datas[0].chunk;
+		else
+			return -EINVAL;
+
+		if ((mem = pw_mempool_find_ptr(impl->context->pool, baseptr)) == NULL)
+			return -EINVAL;
+
+		data_size = 0;
+		for (j = 0; j < buffers[i]->n_metas; j++) {
+			data_size += buffers[i]->metas[j].size;
+		}
+		for (j = 0; j < buffers[i]->n_datas; j++) {
+			struct spa_data *d = buffers[i]->datas;
+			data_size += sizeof(struct spa_chunk);
+			if (d->type == SPA_DATA_MemPtr)
+				data_size += d->maxsize;
+		}
+
+		m = ensure_mem(impl, mem->fd, SPA_DATA_MemFd, mem->flags);
+		b->memid = m->id;
+
+		mb[i].buffer = &b->buffer;
+		mb[i].mem_id = b->memid;
+		mb[i].offset = SPA_PTRDIFF(baseptr, SPA_PTROFF(mem->map->ptr, mem->map->offset, void));
+		mb[i].size = data_size;
+
+		for (j = 0; j < buffers[i]->n_metas; j++)
+			memcpy(&b->buffer.metas[j], &buffers[i]->metas[j], sizeof(struct spa_meta));
+		b->buffer.n_metas = j;
+
+		for (j = 0; j < buffers[i]->n_datas; j++) {
+			struct spa_data *d = &buffers[i]->datas[j];
+
+			memcpy(&b->buffer.datas[j], d, sizeof(struct spa_data));
+
+			if (d->type == SPA_DATA_DmaBuf ||
+			    d->type == SPA_DATA_MemFd) {
+				m = ensure_mem(impl, d->fd, d->type, d->flags);
+				b->buffer.datas[j].data = SPA_UINT32_TO_PTR(m->id);
+			} else if (d->type == SPA_DATA_MemPtr) {
+				b->buffer.datas[j].data = SPA_INT_TO_PTR(SPA_PTRDIFF(d->data, baseptr));
+			} else {
+				b->buffer.datas[j].type = SPA_ID_INVALID;
+				b->buffer.datas[j].data = 0;
+				spa_log_error(this->log, "invalid memory type %d", d->type);
+			}
+		}
+	}
+
+	pw_client_node0_resource_port_use_buffers(this->resource,
+						 this->seq,
+						 direction, port_id,
+						 n_buffers, mb);
+
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int
+impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+	struct node *this = object;
+	struct impl *impl;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_OUT_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+
+	impl = this->impl;
+
+	spa_log_trace(this->log, "reuse buffer %d", buffer_id);
+
+	pw_client_node0_transport_add_message(impl->transport, (struct pw_client_node0_message *)
+			&PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER_INIT(port_id, buffer_id));
+	do_flush(this);
+
+	return 0;
+}
+
+static int impl_node_process_input(struct spa_node *node)
+{
+	struct node *this = SPA_CONTAINER_OF(node, struct node, node);
+	struct impl *impl = this->impl;
+//	bool client_reuse = impl->client_reuse;
+	uint32_t i;
+	int res;
+
+	if (impl->input_ready == 0) {
+		/* the client is not ready to receive our buffers, recycle them */
+		pw_log_trace("node not ready, recycle buffers");
+		for (i = 0; i < MAX_INPUTS; i++) {
+			struct port *p = &this->in_ports[i];
+			struct spa_io_buffers *io = p->io;
+
+			if (!p->valid || io == NULL)
+				continue;
+
+			io->status = SPA_STATUS_NEED_DATA;
+		}
+		res = SPA_STATUS_NEED_DATA;
+	}
+	else {
+		for (i = 0; i < MAX_INPUTS; i++) {
+			struct port *p = &this->in_ports[i];
+			struct spa_io_buffers *io = p->io;
+
+			if (!p->valid || io == NULL)
+				continue;
+
+			pw_log_trace("set io status to %d %d", io->status, io->buffer_id);
+			impl->transport->inputs[p->id] = *io;
+
+			/* explicitly recycle buffers when the client is not going to do it */
+//			if (!client_reuse && (pp = p->peer))
+//		                spa_node_port_reuse_buffer(pp->node->implementation,
+//						pp->port_id, io->buffer_id);
+		}
+		pw_client_node0_transport_add_message(impl->transport,
+			       &PW_CLIENT_NODE0_MESSAGE_INIT(PW_CLIENT_NODE0_MESSAGE_PROCESS_INPUT));
+		do_flush(this);
+
+		impl->input_ready--;
+		res = SPA_STATUS_OK;
+	}
+	return res;
+}
+
+#if 0
+/** this is used for clients providing data to pipewire and currently
+ * not supported in the compat layer */
+static int impl_node_process_output(struct spa_node *node)
+{
+	struct node *this;
+	struct impl *impl;
+	uint32_t i;
+
+	this = SPA_CONTAINER_OF(node, struct node, node);
+	impl = this->impl;
+
+	if (impl->out_pending)
+		goto done;
+
+	impl->out_pending = true;
+
+	for (i = 0; i < MAX_OUTPUTS; i++) {
+		struct port *p = &this->out_ports[i];
+		struct spa_io_buffers *io = p->io;
+
+		if (!p->valid || io == NULL)
+			continue;
+
+		impl->transport->outputs[p->id] = *io;
+
+		pw_log_trace("%d %d -> %d %d", io->status, io->buffer_id,
+				impl->transport->outputs[p->id].status,
+				impl->transport->outputs[p->id].buffer_id);
+	}
+
+      done:
+	pw_client_node0_transport_add_message(impl->transport,
+			       &PW_CLIENT_NODE0_MESSAGE_INIT(PW_CLIENT_NODE0_MESSAGE_PROCESS_OUTPUT));
+	do_flush(this);
+
+	return SPA_STATUS_OK;
+}
+#endif
+
+static int impl_node_process(void *object)
+{
+	struct node *this = object;
+	struct impl *impl = this->impl;
+	struct pw_impl_node *n = impl->this.node;
+
+	return impl_node_process_input(n->node);
+}
+
+static int handle_node_message(struct node *this, struct pw_client_node0_message *message)
+{
+	struct impl *impl = SPA_CONTAINER_OF(this, struct impl, node);
+	uint32_t i;
+
+	switch (PW_CLIENT_NODE0_MESSAGE_TYPE(message)) {
+	case PW_CLIENT_NODE0_MESSAGE_HAVE_OUTPUT:
+		for (i = 0; i < MAX_OUTPUTS; i++) {
+			struct port *p = &this->out_ports[i];
+			struct spa_io_buffers *io = p->io;
+			if (!p->valid || io == NULL)
+				continue;
+			*io = impl->transport->outputs[p->id];
+			pw_log_trace("have output %d %d", io->status, io->buffer_id);
+		}
+		impl->out_pending = false;
+		spa_node_call_ready(&this->callbacks, SPA_STATUS_HAVE_DATA);
+		break;
+
+	case PW_CLIENT_NODE0_MESSAGE_NEED_INPUT:
+		for (i = 0; i < MAX_INPUTS; i++) {
+			struct port *p = &this->in_ports[i];
+			struct spa_io_buffers *io = p->io;
+			if (!p->valid || io == NULL)
+				continue;
+			pw_log_trace("need input %d %d", i, p->id);
+			*io = impl->transport->inputs[p->id];
+			pw_log_trace("need input %d %d", io->status, io->buffer_id);
+		}
+		impl->input_ready++;
+		spa_node_call_ready(&this->callbacks, SPA_STATUS_NEED_DATA);
+		break;
+
+	case PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER:
+		if (impl->client_reuse) {
+			struct pw_client_node0_message_port_reuse_buffer *p =
+			    (struct pw_client_node0_message_port_reuse_buffer *) message;
+			spa_node_call_reuse_buffer(&this->callbacks, p->body.port_id.value,
+					p->body.buffer_id.value);
+		}
+		break;
+
+	default:
+		pw_log_warn("unhandled message %d", PW_CLIENT_NODE0_MESSAGE_TYPE(message));
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static void setup_transport(struct impl *impl)
+{
+	struct node *this = &impl->node;
+	uint32_t max_inputs = 0, max_outputs = 0, n_inputs = 0, n_outputs = 0;
+	struct spa_dict_item items[1];
+
+	n_inputs = this->n_inputs;
+	max_inputs = this->info.max_input_ports == 0 ? this->n_inputs : this->info.max_input_ports;
+	n_outputs = this->n_outputs;
+	max_outputs = this->info.max_output_ports == 0 ? this->n_outputs : this->info.max_output_ports;
+
+	impl->transport = pw_client_node0_transport_new(impl->context, max_inputs, max_outputs);
+	impl->transport->area->n_input_ports = n_inputs;
+	impl->transport->area->n_output_ports = n_outputs;
+
+	if (n_inputs > 0) {
+		items[0] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Stream/Input/Video");
+	} else {
+		items[0] = SPA_DICT_ITEM_INIT(SPA_KEY_MEDIA_CLASS, "Stream/Output/Video");
+	}
+	pw_impl_node_update_properties(impl->this.node, &SPA_DICT_INIT(items, 1));
+}
+
+static void
+client_node0_done(void *data, int seq, int res)
+{
+	struct impl *impl = data;
+	struct node *this = &impl->node;
+
+	if (seq == 0 && res == 0 && impl->transport == NULL)
+		setup_transport(impl);
+
+	pw_log_debug("seq:%d res:%d pending:%d", seq, res, this->init_pending);
+	spa_node_emit_result(&this->hooks, seq, res, 0, NULL);
+
+	if (this->init_pending != SPA_ID_INVALID) {
+		spa_node_emit_result(&this->hooks, this->init_pending, res, 0, NULL);
+		this->init_pending = SPA_ID_INVALID;
+	}
+}
+
+static void
+client_node0_update(void *data,
+		   uint32_t change_mask,
+		   uint32_t max_input_ports,
+		   uint32_t max_output_ports,
+		   uint32_t n_params,
+		   const struct spa_pod **params)
+{
+	struct impl *impl = data;
+	struct node *this = &impl->node;
+
+	if (change_mask & PW_CLIENT_NODE0_UPDATE_MAX_INPUTS)
+		this->info.max_input_ports = max_input_ports;
+	if (change_mask & PW_CLIENT_NODE0_UPDATE_MAX_OUTPUTS)
+		this->info.max_output_ports = max_output_ports;
+	if (change_mask & PW_CLIENT_NODE0_UPDATE_PARAMS) {
+		uint32_t i;
+		spa_log_debug(this->log, "node %p: update %d params", this, n_params);
+
+		for (i = 0; i < this->n_params; i++)
+			free(this->params[i]);
+		this->n_params = n_params;
+		if (this->n_params == 0) {
+			free(this->params);
+			this->params = NULL;
+		} else {
+			void *p;
+			p = pw_reallocarray(this->params, this->n_params, sizeof(struct spa_pod *));
+			if (p == NULL) {
+				pw_log_error("%p: can't realloc: %m", this);
+				free(this->params);
+				this->n_params = 0;
+			}
+			this->params = p;
+		}
+		for (i = 0; i < this->n_params; i++)
+			this->params[i] = params[i] ? spa_pod_copy(params[i]) : NULL;
+	}
+	if (change_mask & (PW_CLIENT_NODE0_UPDATE_MAX_INPUTS | PW_CLIENT_NODE0_UPDATE_MAX_OUTPUTS)) {
+		spa_node_emit_info(&this->hooks, &this->info);
+	}
+
+	spa_log_debug(this->log, "node %p: got node update max_in %u, max_out %u", this,
+		     this->info.max_input_ports, this->info.max_output_ports);
+}
+
+static void
+client_node0_port_update(void *data,
+			enum spa_direction direction,
+			uint32_t port_id,
+			uint32_t change_mask,
+			uint32_t n_params,
+			const struct spa_pod **params,
+			const struct spa_port_info *info)
+{
+	struct impl *impl = data;
+	struct node *this = &impl->node;
+	bool remove;
+
+	spa_log_debug(this->log, "node %p: got port update", this);
+	if (!CHECK_PORT_ID(this, direction, port_id))
+		return;
+
+	remove = (change_mask == 0);
+
+	if (remove) {
+		do_uninit_port(this, direction, port_id);
+	} else {
+		do_update_port(this,
+			       direction,
+			       port_id,
+			       change_mask,
+			       n_params, params, info);
+	}
+}
+
+static void client_node0_set_active(void *data, bool active)
+{
+	struct impl *impl = data;
+	pw_impl_node_set_active(impl->this.node, active);
+}
+
+static void client_node0_event(void *data, struct spa_event *event)
+{
+	struct impl *impl = data;
+	struct node *this = &impl->node;
+
+	switch (SPA_EVENT_TYPE(event)) {
+	case SPA_NODE0_EVENT_RequestClockUpdate:
+		send_clock_update(this);
+		break;
+	default:
+		spa_node_emit_event(&this->hooks, event);
+	}
+}
+
+static const struct pw_client_node0_methods client_node0_methods = {
+	PW_VERSION_CLIENT_NODE0_METHODS,
+	.done = client_node0_done,
+	.update = client_node0_update,
+	.port_update = client_node0_port_update,
+	.set_active = client_node0_set_active,
+	.event = client_node0_event,
+};
+
+static void node_on_data_fd_events(struct spa_source *source)
+{
+	struct node *this = source->data;
+	struct impl *impl = this->impl;
+
+	if (source->rmask & (SPA_IO_ERR | SPA_IO_HUP)) {
+		spa_log_warn(this->log, "node %p: got error", this);
+		return;
+	}
+
+	if (source->rmask & SPA_IO_IN) {
+		struct pw_client_node0_message message;
+		uint64_t cmd;
+
+		if (spa_system_eventfd_read(this->data_system, this->data_source.fd, &cmd) < 0)
+			spa_log_warn(this->log, "node %p: error reading message: %s",
+					this, strerror(errno));
+
+		while (pw_client_node0_transport_next_message(impl->transport, &message) == 1) {
+			struct pw_client_node0_message *msg = alloca(SPA_POD_SIZE(&message));
+			pw_client_node0_transport_parse_message(impl->transport, msg);
+			handle_node_message(this, msg);
+		}
+	}
+}
+
+static const struct spa_node_methods impl_node = {
+	SPA_VERSION_NODE_METHODS,
+	.add_listener = impl_node_add_listener,
+	.set_callbacks = impl_node_set_callbacks,
+	.sync = impl_node_sync,
+	.enum_params = impl_node_enum_params,
+	.set_param = impl_node_set_param,
+	.set_io = impl_node_set_io,
+	.send_command = impl_node_send_command,
+	.add_port = impl_node_add_port,
+	.remove_port = impl_node_remove_port,
+	.port_enum_params = impl_node_port_enum_params,
+	.port_set_param = impl_node_port_set_param,
+	.port_use_buffers = impl_node_port_use_buffers,
+	.port_set_io = impl_node_port_set_io,
+	.port_reuse_buffer = impl_node_port_reuse_buffer,
+	.process = impl_node_process,
+};
+
+static int
+node_init(struct node *this,
+	  struct spa_dict *info,
+	  const struct spa_support *support,
+	  uint32_t n_support)
+{
+	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+	this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+
+	if (this->data_loop == NULL) {
+		spa_log_error(this->log, "a data-loop is needed");
+		return -EINVAL;
+	}
+
+	this->node.iface = SPA_INTERFACE_INIT(
+			SPA_TYPE_INTERFACE_Node,
+			SPA_VERSION_NODE,
+			&impl_node, this);
+	spa_hook_list_init(&this->hooks);
+
+	this->data_source.func = node_on_data_fd_events;
+	this->data_source.data = this;
+	this->data_source.fd = -1;
+	this->data_source.mask = SPA_IO_IN | SPA_IO_ERR | SPA_IO_HUP;
+	this->data_source.rmask = 0;
+
+	this->seq = 1;
+	this->init_pending = SPA_ID_INVALID;
+
+	return SPA_RESULT_RETURN_ASYNC(this->seq++);
+}
+
+static int node_clear(struct node *this)
+{
+	uint32_t i;
+
+	for (i = 0; i < MAX_INPUTS; i++) {
+		if (this->in_ports[i].valid)
+			clear_port(this, &this->in_ports[i], SPA_DIRECTION_INPUT, i);
+	}
+	for (i = 0; i < MAX_OUTPUTS; i++) {
+		if (this->out_ports[i].valid)
+			clear_port(this, &this->out_ports[i], SPA_DIRECTION_OUTPUT, i);
+	}
+
+	return 0;
+}
+
+static int do_remove_source(struct spa_loop *loop,
+			    bool async,
+			    uint32_t seq,
+			    const void *data,
+			    size_t size,
+			    void *user_data)
+{
+	struct spa_source *source = user_data;
+	spa_loop_remove_source(loop, source);
+	return 0;
+}
+
+static void client_node0_resource_destroy(void *data)
+{
+	struct impl *impl = data;
+	struct pw_impl_client_node0 *this = &impl->this;
+	struct node *node = &impl->node;
+
+	pw_log_debug("client-node %p: destroy", impl);
+
+	impl->node.resource = this->resource = NULL;
+	spa_hook_remove(&impl->resource_listener);
+	spa_hook_remove(&impl->object_listener);
+
+	if (node->data_source.fd != -1) {
+		spa_loop_invoke(node->data_loop,
+				do_remove_source,
+				SPA_ID_INVALID,
+				NULL,
+				0,
+				true,
+				&node->data_source);
+	}
+	if (this->node)
+		pw_impl_node_destroy(this->node);
+}
+
+static void node_initialized(void *data)
+{
+	struct impl *impl = data;
+	struct pw_impl_client_node0 *this = &impl->this;
+	struct pw_impl_node *node = this->node;
+	struct spa_system *data_system = impl->node.data_system;
+
+	if (this->resource == NULL)
+		return;
+
+	impl->fds[0] = spa_system_eventfd_create(data_system, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+	impl->fds[1] = spa_system_eventfd_create(data_system, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+	impl->node.data_source.fd = impl->fds[0];
+	impl->node.writefd = impl->fds[1];
+	impl->other_fds[0] = impl->fds[1];
+	impl->other_fds[1] = impl->fds[0];
+
+	spa_loop_add_source(impl->node.data_loop, &impl->node.data_source);
+	pw_log_debug("client-node %p: transport fd %d %d", node, impl->fds[0], impl->fds[1]);
+
+	pw_client_node0_resource_transport(this->resource,
+					  pw_global_get_id(pw_impl_node_get_global(node)),
+					  impl->other_fds[0],
+					  impl->other_fds[1],
+					  impl->transport);
+}
+
+static void node_free(void *data)
+{
+	struct impl *impl = data;
+	struct pw_impl_client_node0 *this = &impl->this;
+	struct spa_system *data_system = impl->node.data_system;
+
+	this->node = NULL;
+
+	pw_log_debug("client-node %p: free", &impl->this);
+	node_clear(&impl->node);
+
+	if (impl->transport)
+		pw_client_node0_transport_destroy(impl->transport);
+
+	spa_hook_remove(&impl->node_listener);
+
+	if (this->resource)
+		pw_resource_destroy(this->resource);
+
+	pw_array_clear(&impl->mems);
+
+	if (impl->fds[0] != -1)
+		spa_system_close(data_system, impl->fds[0]);
+	if (impl->fds[1] != -1)
+		spa_system_close(data_system, impl->fds[1]);
+	free(impl);
+}
+
+static const struct pw_impl_node_events node_events = {
+	PW_VERSION_IMPL_NODE_EVENTS,
+	.free = node_free,
+	.initialized = node_initialized,
+};
+
+static const struct pw_resource_events resource_events = {
+	PW_VERSION_RESOURCE_EVENTS,
+	.destroy = client_node0_resource_destroy,
+};
+
+static void convert_properties(struct pw_properties *properties)
+{
+	static const struct {
+		const char *from, *to;
+	} props[] = {
+		{ "pipewire.autoconnect", PW_KEY_NODE_AUTOCONNECT, },
+		/* XXX deprecated */
+		{ "pipewire.target.node", PW_KEY_NODE_TARGET, }
+	};
+
+	const char *str;
+
+	SPA_FOR_EACH_ELEMENT_VAR(props, p) {
+		if ((str = pw_properties_get(properties, p->from)) != NULL) {
+			pw_properties_set(properties, p->to, str);
+			pw_properties_set(properties, p->from, NULL);
+		}
+	}
+}
+
+/** Create a new client node
+ * \param client an owner \ref pw_client
+ * \param id an id
+ * \param name a name
+ * \param properties extra properties
+ * \return a newly allocated client node
+ *
+ * Create a new \ref pw_impl_node.
+ *
+ * \memberof pw_impl_client_node
+ */
+struct pw_impl_client_node0 *pw_impl_client_node0_new(struct pw_resource *resource,
+					  struct pw_properties *properties)
+{
+	struct impl *impl;
+	struct pw_impl_client_node0 *this;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct pw_context *context = pw_impl_client_get_context(client);
+	const struct spa_support *support;
+	uint32_t n_support;
+	const char *name;
+	int res;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		return NULL;
+
+	this = &impl->this;
+
+	if (properties == NULL)
+		properties = pw_properties_new(NULL, NULL);
+	if (properties == NULL) {
+		res = -errno;
+		goto error_exit_free;
+	}
+	convert_properties(properties);
+
+	pw_properties_setf(properties, PW_KEY_CLIENT_ID, "%d", client->global->id);
+
+	impl->context = context;
+	impl->fds[0] = impl->fds[1] = -1;
+	pw_log_debug("client-node %p: new", impl);
+
+	support = pw_context_get_support(impl->context, &n_support);
+
+	node_init(&impl->node, NULL, support, n_support);
+	impl->node.impl = impl;
+
+	pw_array_init(&impl->mems, 64);
+
+	if ((name = pw_properties_get(properties, "node.name")) == NULL)
+		name = "client-node";
+	pw_properties_set(properties, PW_KEY_MEDIA_TYPE, "Video");
+
+	impl->node.resource = resource;
+	this->resource = resource;
+	this->node = pw_spa_node_new(context,
+				     PW_SPA_NODE_FLAG_ASYNC,
+				     &impl->node.node,
+				     NULL,
+				     properties, 0);
+	if (this->node == NULL) {
+		res = -errno;
+		goto error_no_node;
+	}
+
+	impl->client_reuse = pw_properties_get_bool(properties, "pipewire.client.reuse", false);
+
+	pw_resource_add_listener(this->resource,
+				 &impl->resource_listener,
+				 &resource_events,
+				 impl);
+	pw_resource_add_object_listener(this->resource,
+				&impl->object_listener,
+				&client_node0_methods,
+				impl);
+
+
+	pw_impl_node_add_listener(this->node, &impl->node_listener, &node_events, impl);
+
+	return this;
+
+error_no_node:
+	pw_resource_destroy(this->resource);
+	node_clear(&impl->node);
+error_exit_free:
+	free(impl);
+	errno = -res;
+	return NULL;
+}
+
+/** Destroy a client node
+ * \param node the client node to destroy
+ * \memberof pw_impl_client_node
+ */
+void pw_impl_client_node0_destroy(struct pw_impl_client_node0 *node)
+{
+	pw_resource_destroy(node->resource);
+}
diff --git a/src/modules/module-client-node/v0/client-node.h b/src/modules/module-client-node/v0/client-node.h
new file mode 100644
index 0000000..04b77d4
--- /dev/null
+++ b/src/modules/module-client-node/v0/client-node.h
@@ -0,0 +1,101 @@
+/* PipeWire
+ *
+ * Copyright © 2015 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef PIPEWIRE_CLIENT_NODE0_H
+#define PIPEWIRE_CLIENT_NODE0_H
+
+#include <pipewire/impl.h>
+
+#include "ext-client-node.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** The state of the clock */
+enum spa_clock0_state {
+	SPA_CLOCK0_STATE_STOPPED,	/*< the clock is stopped */
+	SPA_CLOCK0_STATE_PAUSED,	/*< the clock is paused */
+	SPA_CLOCK0_STATE_RUNNING,	/*< the clock is running */
+};
+
+struct spa_command_node0_clock_update_body {
+	struct spa_pod_object_body body;
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_TIME      (1 << 0)
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_SCALE     (1 << 1)
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_STATE     (1 << 2)
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_LATENCY   (1 << 3)
+	struct spa_pod_int change_mask          SPA_ALIGNED(8);
+	struct spa_pod_int rate                 SPA_ALIGNED(8);
+	struct spa_pod_long ticks               SPA_ALIGNED(8);
+	struct spa_pod_long monotonic_time      SPA_ALIGNED(8);
+	struct spa_pod_long offset              SPA_ALIGNED(8);
+	struct spa_pod_int scale                SPA_ALIGNED(8);
+	struct spa_pod_int state                SPA_ALIGNED(8);
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_FLAG_LIVE (1 << 0)
+	struct spa_pod_int flags                SPA_ALIGNED(8);
+	struct spa_pod_long latency             SPA_ALIGNED(8);
+};
+
+struct spa_command_node0_clock_update {
+	struct spa_pod pod;
+	struct spa_command_node0_clock_update_body body;
+};
+
+#define SPA_COMMAND_NODE0_CLOCK_UPDATE_INIT(type,change_mask,rate,ticks,monotonic_time,offset,scale,state,flags,latency)  \
+	SPA_COMMAND_INIT_FULL(struct spa_command_node0_clock_update,			\
+                        sizeof(struct spa_command_node0_clock_update_body), 0, type,	\
+			SPA_POD_INIT_Int(change_mask),					\
+			SPA_POD_INIT_Int(rate),						\
+			SPA_POD_INIT_Long(ticks),					\
+			SPA_POD_INIT_Long(monotonic_time),				\
+			SPA_POD_INIT_Long(offset),					\
+			SPA_POD_INIT_Int(scale),					\
+			SPA_POD_INIT_Int(state),					\
+			SPA_POD_INIT_Int(flags),					\
+			SPA_POD_INIT_Long(latency))
+
+
+/** \class pw_impl_client_node0
+ *
+ * PipeWire client node interface
+ */
+struct pw_impl_client_node0 {
+	struct pw_impl_node *node;
+
+	struct pw_resource *resource;
+};
+
+struct pw_impl_client_node0 *
+pw_impl_client_node0_new(struct pw_resource *resource,
+		   struct pw_properties *properties);
+
+void
+pw_impl_client_node0_destroy(struct pw_impl_client_node0 *node);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PIPEWIRE_CLIENT_NODE0_H */
diff --git a/src/modules/module-client-node/v0/ext-client-node.h b/src/modules/module-client-node/v0/ext-client-node.h
new file mode 100644
index 0000000..21ba597
--- /dev/null
+++ b/src/modules/module-client-node/v0/ext-client-node.h
@@ -0,0 +1,414 @@
+/* PipeWire
+ *
+ * Copyright © 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __PIPEWIRE_EXT_CLIENT_NODE0_H__
+#define __PIPEWIRE_EXT_CLIENT_NODE0_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <spa/utils/defs.h>
+#include <spa/param/param.h>
+#include <spa/node/node.h>
+
+#include <pipewire/proxy.h>
+
+#define PW_TYPE_INTERFACE_ClientNode            PW_TYPE_INFO_INTERFACE_BASE "ClientNode"
+
+#define PW_VERSION_CLIENT_NODE0		0
+
+struct pw_client_node0_message;
+
+/** Shared structure between client and server \memberof pw_client_node */
+struct pw_client_node0_area {
+	uint32_t max_input_ports;	/**< max input ports of the node */
+	uint32_t n_input_ports;		/**< number of input ports of the node */
+	uint32_t max_output_ports;	/**< max output ports of the node */
+	uint32_t n_output_ports;	/**< number of output ports of the node */
+};
+
+/** \class pw_client_node0_transport
+ *
+ * \brief Transport object
+ *
+ * The transport object contains shared data and ringbuffers to exchange
+ * events and data between the server and the client in a low-latency and
+ * lockfree way.
+ */
+struct pw_client_node0_transport {
+	struct pw_client_node0_area *area;	/**< the transport area */
+	struct spa_io_buffers *inputs;		/**< array of buffer input io */
+	struct spa_io_buffers *outputs;		/**< array of buffer output io */
+	void *input_data;			/**< input memory for ringbuffer */
+	struct spa_ringbuffer *input_buffer;	/**< ringbuffer for input memory */
+	void *output_data;			/**< output memory for ringbuffer */
+	struct spa_ringbuffer *output_buffer;	/**< ringbuffer for output memory */
+
+	/** Destroy a transport
+	 * \param trans a transport to destroy
+	 * \memberof pw_client_node0_transport
+	 */
+	void (*destroy) (struct pw_client_node0_transport *trans);
+
+	/** Add a message to the transport
+	 * \param trans the transport to send the message on
+	 * \param message the message to add
+	 * \return 0 on success, < 0 on error
+	 *
+	 * Write \a message to the shared ringbuffer.
+	 */
+	int (*add_message) (struct pw_client_node0_transport *trans, struct pw_client_node0_message *message);
+
+	/** Get next message from a transport
+	 * \param trans the transport to get the message of
+	 * \param[out] message the message to read
+	 * \return < 0 on error, 1 when a message is available,
+	 *           0 when no more messages are available.
+	 *
+	 * Get the skeleton next message from \a trans into \a message. This function will
+	 * only read the head and object body of the message.
+	 *
+	 * After the complete size of the message has been calculated, you should call
+	 * \ref parse_message() to read the complete message contents.
+	 */
+	int (*next_message) (struct pw_client_node0_transport *trans, struct pw_client_node0_message *message);
+
+	/** Parse the complete message on transport
+	 * \param trans the transport to read from
+	 * \param[out] message memory that can hold the complete message
+	 * \return 0 on success, < 0 on error
+	 *
+	 * Use this function after \ref next_message().
+	 */
+	int (*parse_message) (struct pw_client_node0_transport *trans, void *message);
+};
+
+#define pw_client_node0_transport_destroy(t)		((t)->destroy((t)))
+#define pw_client_node0_transport_add_message(t,m)	((t)->add_message((t), (m)))
+#define pw_client_node0_transport_next_message(t,m)	((t)->next_message((t), (m)))
+#define pw_client_node0_transport_parse_message(t,m)	((t)->parse_message((t), (m)))
+
+enum pw_client_node0_message_type {
+	PW_CLIENT_NODE0_MESSAGE_HAVE_OUTPUT,		/*< signal that the node has output */
+	PW_CLIENT_NODE0_MESSAGE_NEED_INPUT,		/*< signal that the node needs input */
+	PW_CLIENT_NODE0_MESSAGE_PROCESS_INPUT,		/*< instruct the node to process input */
+	PW_CLIENT_NODE0_MESSAGE_PROCESS_OUTPUT,		/*< instruct the node output is processed */
+	PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER,	/*< reuse a buffer */
+};
+
+struct pw_client_node0_message_body {
+	struct spa_pod_int type		SPA_ALIGNED(8);	/*< one of enum pw_client_node0_message_type */
+};
+
+struct pw_client_node0_message {
+	struct spa_pod_struct pod;
+	struct pw_client_node0_message_body body;
+};
+
+struct pw_client_node0_message_port_reuse_buffer_body {
+	struct spa_pod_int type		SPA_ALIGNED(8);	/*< PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER */
+	struct spa_pod_int port_id	SPA_ALIGNED(8);	/*< port id */
+	struct spa_pod_int buffer_id	SPA_ALIGNED(8); /*< buffer id to reuse */
+};
+
+struct pw_client_node0_message_port_reuse_buffer {
+	struct spa_pod_struct pod;
+	struct pw_client_node0_message_port_reuse_buffer_body body;
+};
+
+#define PW_CLIENT_NODE0_MESSAGE_TYPE(message)	(((struct pw_client_node0_message*)(message))->body.type.value)
+
+#define PW_CLIENT_NODE0_MESSAGE_INIT(message) ((struct pw_client_node0_message)			\
+	{ { { sizeof(struct pw_client_node0_message_body), SPA_TYPE_Struct } },			\
+	  { SPA_POD_INIT_Int(message) } })
+
+#define PW_CLIENT_NODE0_MESSAGE_INIT_FULL(type,size,message,...) (type)				\
+	{ { { size, SPA_TYPE_Struct } },							\
+	  { SPA_POD_INIT_Int(message), ##__VA_ARGS__ } }					\
+
+#define PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER_INIT(port_id,buffer_id)			\
+	PW_CLIENT_NODE0_MESSAGE_INIT_FULL(struct pw_client_node0_message_port_reuse_buffer,	\
+		sizeof(struct pw_client_node0_message_port_reuse_buffer_body),			\
+		PW_CLIENT_NODE0_MESSAGE_PORT_REUSE_BUFFER,					\
+		SPA_POD_INIT_Int(port_id),							\
+		SPA_POD_INIT_Int(buffer_id))
+
+/** information about a buffer */
+struct pw_client_node0_buffer {
+	uint32_t mem_id;		/**< the memory id for the metadata */
+	uint32_t offset;		/**< offset in memory */
+	uint32_t size;			/**< size in memory */
+	struct spa_buffer *buffer;	/**< buffer describing metadata and buffer memory */
+};
+
+#define PW_CLIENT_NODE0_METHOD_DONE		0
+#define PW_CLIENT_NODE0_METHOD_UPDATE		1
+#define PW_CLIENT_NODE0_METHOD_PORT_UPDATE	2
+#define PW_CLIENT_NODE0_METHOD_SET_ACTIVE		3
+#define PW_CLIENT_NODE0_METHOD_EVENT		4
+#define PW_CLIENT_NODE0_METHOD_DESTROY		5
+#define PW_CLIENT_NODE0_METHOD_NUM		6
+
+/** \ref pw_client_node methods */
+struct pw_client_node0_methods {
+#define PW_VERSION_CLIENT_NODE0_METHODS		0
+	uint32_t version;
+
+	/** Complete an async operation */
+	void (*done) (void *object, int seq, int res);
+
+	/**
+	 * Update the node ports and properties
+	 *
+	 * Update the maximum number of ports and the params of the
+	 * client node.
+	 * \param change_mask bitfield with changed parameters
+	 * \param max_input_ports new max input ports
+	 * \param max_output_ports new max output ports
+	 * \param params new params
+	 */
+	void (*update) (void *object,
+#define PW_CLIENT_NODE0_UPDATE_MAX_INPUTS   (1 << 0)
+#define PW_CLIENT_NODE0_UPDATE_MAX_OUTPUTS  (1 << 1)
+#define PW_CLIENT_NODE0_UPDATE_PARAMS       (1 << 2)
+			uint32_t change_mask,
+			uint32_t max_input_ports,
+			uint32_t max_output_ports,
+			uint32_t n_params,
+			const struct spa_pod **params);
+
+	/**
+	 * Update a node port
+	 *
+	 * Update the information of one port of a node.
+	 * \param direction the direction of the port
+	 * \param port_id the port id to update
+	 * \param change_mask a bitfield of changed items
+	 * \param n_params number of port parameters
+	 * \param params array of port parameters
+	 * \param info port information
+	 */
+	void (*port_update) (void *object,
+			     enum spa_direction direction,
+			     uint32_t port_id,
+#define PW_CLIENT_NODE0_PORT_UPDATE_PARAMS            (1 << 0)
+#define PW_CLIENT_NODE0_PORT_UPDATE_INFO              (1 << 1)
+			     uint32_t change_mask,
+			     uint32_t n_params,
+			     const struct spa_pod **params,
+			     const struct spa_port_info *info);
+	/**
+	 * Activate or deactivate the node
+	 */
+	void (*set_active) (void *object, bool active);
+	/**
+	 * Send an event to the node
+	 * \param event the event to send
+	 */
+	void (*event) (void *object, struct spa_event *event);
+	/**
+	 * Destroy the client_node
+	 */
+	void (*destroy) (void *object);
+};
+
+#define PW_CLIENT_NODE0_EVENT_ADD_MEM		0
+#define PW_CLIENT_NODE0_EVENT_TRANSPORT		1
+#define PW_CLIENT_NODE0_EVENT_SET_PARAM		2
+#define PW_CLIENT_NODE0_EVENT_EVENT		3
+#define PW_CLIENT_NODE0_EVENT_COMMAND		4
+#define PW_CLIENT_NODE0_EVENT_ADD_PORT		5
+#define PW_CLIENT_NODE0_EVENT_REMOVE_PORT	6
+#define PW_CLIENT_NODE0_EVENT_PORT_SET_PARAM	7
+#define PW_CLIENT_NODE0_EVENT_PORT_USE_BUFFERS	8
+#define PW_CLIENT_NODE0_EVENT_PORT_COMMAND	9
+#define PW_CLIENT_NODE0_EVENT_PORT_SET_IO	10
+#define PW_CLIENT_NODE0_EVENT_NUM		11
+
+/** \ref pw_client_node events */
+struct pw_client_node0_events {
+#define PW_VERSION_CLIENT_NODE0_EVENTS		0
+	uint32_t version;
+	/**
+	 * Memory was added to a node
+	 *
+	 * \param mem_id the id of the memory
+	 * \param type the memory type
+	 * \param memfd the fd of the memory
+	 * \param flags flags for the \a memfd
+	 */
+	void (*add_mem) (void *data,
+			 uint32_t mem_id,
+			 uint32_t type,
+			 int memfd,
+			 uint32_t flags);
+	/**
+	 * Notify of a new transport area
+	 *
+	 * The transport area is used to exchange real-time commands between
+	 * the client and the server.
+	 *
+	 * \param node_id the node id created for this client node
+	 * \param readfd fd for signal data can be read
+	 * \param writefd fd for signal data can be written
+	 * \param transport the shared transport area
+	 */
+	void (*transport) (void *data,
+			   uint32_t node_id,
+			   int readfd,
+			   int writefd,
+			   struct pw_client_node0_transport *transport);
+	/**
+	 * Notify of a property change
+	 *
+	 * When the server configures the properties on the node
+	 * this event is sent
+	 *
+	 * \param seq a sequence number
+	 * \param id the id of the parameter
+	 * \param flags parameter flags
+	 * \param param the param to set
+	 */
+	void (*set_param) (void *data, uint32_t seq,
+			   uint32_t id, uint32_t flags,
+			   const struct spa_pod *param);
+	/**
+	 * Receive an event from the client node
+	 * \param event the received event */
+	void (*event) (void *data, const struct spa_event *event);
+	/**
+	 * Notify of a new node command
+	 *
+	 * \param seq a sequence number
+	 * \param command the command
+	 */
+	void (*command) (void *data, uint32_t seq, const struct spa_command *command);
+	/**
+	 * A new port was added to the node
+	 *
+	 * The server can at any time add a port to the node when there
+	 * are free ports available.
+	 *
+	 * \param seq a sequence number
+	 * \param direction the direction of the port
+	 * \param port_id the new port id
+	 */
+	void (*add_port) (void *data,
+			  uint32_t seq,
+			  enum spa_direction direction,
+			  uint32_t port_id);
+	/**
+	 * A port was removed from the node
+	 *
+	 * \param seq a sequence number
+	 * \param direction a port direction
+	 * \param port_id the remove port id
+	 */
+	void (*remove_port) (void *data,
+			     uint32_t seq,
+			     enum spa_direction direction,
+			     uint32_t port_id);
+	/**
+	 * A parameter was configured on the port
+	 *
+	 * \param seq a sequence number
+	 * \param direction a port direction
+	 * \param port_id the port id
+	 * \param id the id of the parameter
+	 * \param flags flags used when setting the param
+	 * \param param the new param
+	 */
+	void (*port_set_param) (void *data,
+				uint32_t seq,
+				enum spa_direction direction,
+				uint32_t port_id,
+				uint32_t id, uint32_t flags,
+				const struct spa_pod *param);
+	/**
+	 * Notify the port of buffers
+	 *
+	 * \param seq a sequence number
+	 * \param direction a port direction
+	 * \param port_id the port id
+	 * \param n_buffer the number of buffers
+	 * \param buffers and array of buffer descriptions
+	 */
+	void (*port_use_buffers) (void *data,
+				  uint32_t seq,
+				  enum spa_direction direction,
+				  uint32_t port_id,
+				  uint32_t n_buffers,
+				  struct pw_client_node0_buffer *buffers);
+	/**
+	 * Notify of a new port command
+	 *
+	 * \param direction a port direction
+	 * \param port_id the port id
+	 * \param command the command
+	 */
+	void (*port_command) (void *data,
+			      enum spa_direction direction,
+			      uint32_t port_id,
+			      const struct spa_command *command);
+
+	/**
+	 * Configure the io area with \a id of \a port_id.
+	 *
+	 * \param seq a sequence number
+	 * \param direction the direction of the port
+	 * \param port_id the port id
+	 * \param id the id of the io area to set
+	 * \param mem_id the id of the memory to use
+	 * \param offset offset of io area in memory
+	 * \param size size of the io area
+	 */
+	void (*port_set_io) (void *data,
+			     uint32_t seq,
+			     enum spa_direction direction,
+			     uint32_t port_id,
+			     uint32_t id,
+			     uint32_t mem_id,
+			     uint32_t offset,
+			     uint32_t size);
+};
+#define pw_client_node0_resource(r,m,v,...) pw_resource_call(r, struct pw_client_node0_events, m, v, ##__VA_ARGS__)
+
+#define pw_client_node0_resource_add_mem(r,...)		 pw_client_node0_resource(r,add_mem,0,__VA_ARGS__)
+#define pw_client_node0_resource_transport(r,...)	 pw_client_node0_resource(r,transport,0,__VA_ARGS__)
+#define pw_client_node0_resource_set_param(r,...)	 pw_client_node0_resource(r,set_param,0,__VA_ARGS__)
+#define pw_client_node0_resource_event(r,...)		 pw_client_node0_resource(r,event,0,__VA_ARGS__)
+#define pw_client_node0_resource_command(r,...)		 pw_client_node0_resource(r,command,0,__VA_ARGS__)
+#define pw_client_node0_resource_add_port(r,...)	 pw_client_node0_resource(r,add_port,0,__VA_ARGS__)
+#define pw_client_node0_resource_remove_port(r,...)	 pw_client_node0_resource(r,remove_port,0,__VA_ARGS__)
+#define pw_client_node0_resource_port_set_param(r,...)	 pw_client_node0_resource(r,port_set_param,0,__VA_ARGS__)
+#define pw_client_node0_resource_port_use_buffers(r,...) pw_client_node0_resource(r,port_use_buffers,0,__VA_ARGS__)
+#define pw_client_node0_resource_port_command(r,...)	 pw_client_node0_resource(r,port_command,0,__VA_ARGS__)
+#define pw_client_node0_resource_port_set_io(r,...)	 pw_client_node0_resource(r,port_set_io,0,__VA_ARGS__)
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* __PIPEWIRE_EXT_CLIENT_NODE0_H__ */
diff --git a/src/modules/module-client-node/v0/protocol-native.c b/src/modules/module-client-node/v0/protocol-native.c
new file mode 100644
index 0000000..86d8fe9
--- /dev/null
+++ b/src/modules/module-client-node/v0/protocol-native.c
@@ -0,0 +1,534 @@
+/* PipeWire
+ *
+ * Copyright © 2017 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+
+#include <spa/pod/parser.h>
+#include <spa/pod/builder.h>
+#include <spa/utils/type-info.h>
+
+#include "pipewire/impl.h"
+
+#include "pipewire/extensions/protocol-native.h"
+
+#include "ext-client-node.h"
+
+#include "transport.h"
+
+#define PW_PROTOCOL_NATIVE_FLAG_REMAP        (1<<0)
+
+extern uint32_t pw_protocol_native0_find_type(struct pw_impl_client *client, const char *type);
+extern int pw_protocol_native0_pod_to_v2(struct pw_impl_client *client, const struct spa_pod *pod,
+		struct spa_pod_builder *b);
+extern struct spa_pod * pw_protocol_native0_pod_from_v2(struct pw_impl_client *client,
+		const struct spa_pod *pod);
+extern uint32_t pw_protocol_native0_type_to_v2(struct pw_impl_client *client,
+		const struct spa_type_info *info, uint32_t type);
+
+static void
+client_node_marshal_add_mem(void *data,
+			    uint32_t mem_id,
+			    uint32_t type,
+			    int memfd, uint32_t flags)
+{
+	struct pw_resource *resource = data;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_builder *b;
+	const char *typename;
+
+	switch (type) {
+	case SPA_DATA_MemFd:
+		typename = "Spa:Enum:DataType:Fd:MemFd";
+		break;
+	case SPA_DATA_DmaBuf:
+		typename = "Spa:Enum:DataType:Fd:DmaBuf";
+		break;
+	default:
+	case SPA_DATA_MemPtr:
+		return;
+
+	}
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_ADD_MEM, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", mem_id,
+			       "I", pw_protocol_native0_find_type(client, typename),
+			       "i", pw_protocol_native_add_resource_fd(resource, memfd),
+			       "i", flags);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void client_node_marshal_transport(void *data, uint32_t node_id, int readfd, int writefd,
+					  struct pw_client_node0_transport *transport)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+	struct pw_client_node0_transport_info info;
+
+	pw_client_node0_transport_get_info(transport, &info);
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_TRANSPORT, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", node_id,
+			       "i", pw_protocol_native_add_resource_fd(resource, readfd),
+			       "i", pw_protocol_native_add_resource_fd(resource, writefd),
+			       "i", pw_protocol_native_add_resource_fd(resource, info.memfd),
+			       "i", info.offset,
+			       "i", info.size);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_set_param(void *data, uint32_t seq, uint32_t id, uint32_t flags,
+			      const struct spa_pod *param)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_SET_PARAM, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", seq,
+			       "I", id,
+			       "i", flags,
+			       "P", param);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void client_node_marshal_event_event(void *data, const struct spa_event *event)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_EVENT, NULL);
+
+	spa_pod_builder_add_struct(b, "P", event);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_command(void *data, uint32_t seq, const struct spa_command *command)
+{
+	struct pw_resource *resource = data;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_builder *b;
+	struct spa_pod_frame f;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_COMMAND, NULL);
+
+	spa_pod_builder_push_struct(b, &f);
+	spa_pod_builder_add(b, "i", seq, NULL);
+	if (SPA_COMMAND_TYPE(command) == 0)
+		spa_pod_builder_add(b, "P", command, NULL);
+	else
+		pw_protocol_native0_pod_to_v2(client, (struct spa_pod *)command, b);
+	spa_pod_builder_pop(b, &f);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_add_port(void *data,
+			     uint32_t seq, enum spa_direction direction, uint32_t port_id)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_ADD_PORT, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", seq,
+			       "i", direction,
+			       "i", port_id);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_remove_port(void *data,
+				uint32_t seq, enum spa_direction direction, uint32_t port_id)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_REMOVE_PORT, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", seq,
+			       "i", direction,
+			       "i", port_id);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_port_set_param(void *data,
+				   uint32_t seq,
+				   enum spa_direction direction,
+				   uint32_t port_id,
+				   uint32_t id,
+				   uint32_t flags,
+				   const struct spa_pod *param)
+{
+	struct pw_resource *resource = data;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_builder *b;
+	struct spa_pod_frame f;
+	const char *typename;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_PORT_SET_PARAM, NULL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+		typename = "Spa:Enum:ParamId:Props";
+		break;
+	case SPA_PARAM_Format:
+		typename = "Spa:Enum:ParamId:Format";
+		break;
+	default:
+		return;
+	}
+
+	spa_pod_builder_push_struct(b, &f);
+	spa_pod_builder_add(b,
+			"i", seq,
+			"i", direction,
+			"i", port_id,
+			"I", pw_protocol_native0_find_type(client, typename),
+			"i", flags, NULL);
+	pw_protocol_native0_pod_to_v2(client, param, b);
+	spa_pod_builder_pop(b, &f);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_port_use_buffers(void *data,
+				     uint32_t seq,
+				     enum spa_direction direction,
+				     uint32_t port_id,
+				     uint32_t n_buffers, struct pw_client_node0_buffer *buffers)
+{
+	struct pw_resource *resource = data;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_builder *b;
+	struct spa_pod_frame f;
+	uint32_t i, j;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_PORT_USE_BUFFERS, NULL);
+
+	spa_pod_builder_push_struct(b, &f);
+	spa_pod_builder_add(b,
+			    "i", seq,
+			    "i", direction,
+			    "i", port_id,
+			    "i", n_buffers, NULL);
+
+	for (i = 0; i < n_buffers; i++) {
+		struct spa_buffer *buf = buffers[i].buffer;
+
+		spa_pod_builder_add(b,
+				    "i", buffers[i].mem_id,
+				    "i", buffers[i].offset,
+				    "i", buffers[i].size,
+				    "i", i,
+				    "i", buf->n_metas, NULL);
+
+		for (j = 0; j < buf->n_metas; j++) {
+			struct spa_meta *m = &buf->metas[j];
+			spa_pod_builder_add(b,
+					    "I", pw_protocol_native0_type_to_v2(client, spa_type_meta_type, m->type),
+					    "i", m->size, NULL);
+		}
+		spa_pod_builder_add(b, "i", buf->n_datas, NULL);
+		for (j = 0; j < buf->n_datas; j++) {
+			struct spa_data *d = &buf->datas[j];
+			spa_pod_builder_add(b,
+					    "I", pw_protocol_native0_type_to_v2(client, spa_type_data_type, d->type),
+					    "i", SPA_PTR_TO_UINT32(d->data),
+					    "i", d->flags,
+					    "i", d->mapoffset,
+					    "i", d->maxsize, NULL);
+		}
+	}
+	spa_pod_builder_pop(b, &f);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_port_command(void *data,
+				 uint32_t direction,
+				 uint32_t port_id,
+				 const struct spa_command *command)
+{
+	struct pw_resource *resource = data;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_builder *b;
+	struct spa_pod_frame f;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_PORT_COMMAND, NULL);
+
+	spa_pod_builder_push_struct(b, &f);
+	spa_pod_builder_add(b,
+			"i", direction,
+			"i", port_id, NULL);
+	pw_protocol_native0_pod_to_v2(client, (struct spa_pod *)command, b);
+	spa_pod_builder_pop(b, &f);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+static void
+client_node_marshal_port_set_io(void *data,
+				uint32_t seq,
+				uint32_t direction,
+				uint32_t port_id,
+				uint32_t id,
+				uint32_t memid,
+				uint32_t offset,
+				uint32_t size)
+{
+	struct pw_resource *resource = data;
+	struct spa_pod_builder *b;
+
+	b = pw_protocol_native_begin_resource(resource, PW_CLIENT_NODE0_EVENT_PORT_SET_IO, NULL);
+
+	spa_pod_builder_add_struct(b,
+			       "i", seq,
+			       "i", direction,
+			       "i", port_id,
+			       "I", id,
+			       "i", memid,
+			       "i", offset,
+			       "i", size);
+
+	pw_protocol_native_end_resource(resource, b);
+}
+
+
+static int client_node_demarshal_done(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct spa_pod_parser prs;
+	uint32_t seq, res;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_get_struct(&prs,
+			"i", &seq,
+			"i", &res) < 0)
+		return -EINVAL;
+
+	return pw_resource_notify(resource, struct pw_client_node0_methods, done, 0, seq, res);
+}
+
+static int client_node_demarshal_update(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct spa_pod_parser prs;
+	struct spa_pod_frame f;
+	uint32_t change_mask, max_input_ports, max_output_ports, n_params;
+	const struct spa_pod **params;
+	uint32_t i;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_push_struct(&prs, &f) < 0 ||
+	    spa_pod_parser_get(&prs,
+			"i", &change_mask,
+			"i", &max_input_ports,
+			"i", &max_output_ports,
+			"i", &n_params, NULL) < 0)
+		return -EINVAL;
+
+	params = alloca(n_params * sizeof(struct spa_pod *));
+	for (i = 0; i < n_params; i++)
+		if (spa_pod_parser_get(&prs, "O", &params[i], NULL) < 0)
+			return -EINVAL;
+
+	return pw_resource_notify(resource, struct pw_client_node0_methods, update, 0, change_mask,
+									max_input_ports,
+									max_output_ports,
+									n_params,
+									params);
+}
+
+static int client_node_demarshal_port_update(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct spa_pod_parser prs;
+	struct spa_pod_frame f[2];
+	uint32_t i, direction, port_id, change_mask, n_params;
+	const struct spa_pod **params = NULL;
+	struct spa_port_info info = { 0 }, *infop = NULL;
+	struct spa_dict props;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_push_struct(&prs, &f[0]) < 0 ||
+	    spa_pod_parser_get(&prs,
+			"i", &direction,
+			"i", &port_id,
+			"i", &change_mask,
+			"i", &n_params, NULL) < 0)
+		return -EINVAL;
+
+	params = alloca(n_params * sizeof(struct spa_pod *));
+	for (i = 0; i < n_params; i++)
+		if (spa_pod_parser_get(&prs, "O", &params[i], NULL) < 0)
+			return -EINVAL;
+
+
+	if (spa_pod_parser_push_struct(&prs, &f[1]) >= 0) {
+		infop = &info;
+
+		if (spa_pod_parser_get(&prs,
+				"i", &info.flags,
+				"i", &info.rate,
+				"i", &props.n_items, NULL) < 0)
+			return -EINVAL;
+
+		if (props.n_items > 0) {
+			info.props = &props;
+
+			props.items = alloca(props.n_items * sizeof(struct spa_dict_item));
+			for (i = 0; i < props.n_items; i++) {
+				if (spa_pod_parser_get(&prs,
+						"s", &props.items[i].key,
+						"s", &props.items[i].value,
+						NULL) < 0)
+					return -EINVAL;
+			}
+		}
+	}
+
+	return pw_resource_notify(resource, struct pw_client_node0_methods, port_update, 0, direction,
+									     port_id,
+									     change_mask,
+									     n_params,
+									     params, infop);
+}
+
+static int client_node_demarshal_set_active(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct spa_pod_parser prs;
+	int active;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_get_struct(&prs,
+			"b", &active) < 0)
+		return -EINVAL;
+
+        return pw_resource_notify(resource, struct pw_client_node0_methods, set_active, 0, active);
+}
+
+static int client_node_demarshal_event_method(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct pw_impl_client *client = pw_resource_get_client(resource);
+	struct spa_pod_parser prs;
+	struct spa_event *event;
+	int res;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_get_struct(&prs,
+			"O", &event) < 0)
+		return -EINVAL;
+
+	event = (struct spa_event*)pw_protocol_native0_pod_from_v2(client, (struct spa_pod *)event);
+
+	res = pw_resource_notify(resource, struct pw_client_node0_methods, event, 0, event);
+	free(event);
+
+	return res;
+}
+
+static int client_node_demarshal_destroy(void *object, const struct pw_protocol_native_message *msg)
+{
+	struct pw_resource *resource = object;
+	struct spa_pod_parser prs;
+	int res;
+
+	spa_pod_parser_init(&prs, msg->data, msg->size);
+	if (spa_pod_parser_get_struct(&prs, NULL) < 0)
+		return -EINVAL;
+
+	res = pw_resource_notify(resource, struct pw_client_node0_methods, destroy, 0);
+	pw_resource_destroy(resource);
+	return res;
+}
+
+static const struct pw_protocol_native_demarshal pw_protocol_native_client_node_method_demarshal[] = {
+	{ &client_node_demarshal_done, 0, 0 },
+	{ &client_node_demarshal_update, 0, PW_PROTOCOL_NATIVE_FLAG_REMAP },
+	{ &client_node_demarshal_port_update, 0, PW_PROTOCOL_NATIVE_FLAG_REMAP },
+	{ &client_node_demarshal_set_active, 0, 0 },
+	{ &client_node_demarshal_event_method, 0, PW_PROTOCOL_NATIVE_FLAG_REMAP },
+	{ &client_node_demarshal_destroy, 0, 0 },
+};
+
+static const struct pw_client_node0_events pw_protocol_native_client_node_event_marshal = {
+	PW_VERSION_CLIENT_NODE0_EVENTS,
+	&client_node_marshal_add_mem,
+	&client_node_marshal_transport,
+	&client_node_marshal_set_param,
+	&client_node_marshal_event_event,
+	&client_node_marshal_command,
+	&client_node_marshal_add_port,
+	&client_node_marshal_remove_port,
+	&client_node_marshal_port_set_param,
+	&client_node_marshal_port_use_buffers,
+	&client_node_marshal_port_command,
+	&client_node_marshal_port_set_io,
+};
+
+static const struct pw_protocol_marshal pw_protocol_native_client_node_marshal = {
+	PW_TYPE_INTERFACE_ClientNode,
+	PW_VERSION_CLIENT_NODE0,
+	PW_CLIENT_NODE0_METHOD_NUM,
+	PW_CLIENT_NODE0_EVENT_NUM,
+	0,
+	NULL,
+	.server_demarshal = &pw_protocol_native_client_node_method_demarshal,
+	.server_marshal = &pw_protocol_native_client_node_event_marshal,
+	NULL,
+};
+
+struct pw_protocol *pw_protocol_native_ext_client_node0_init(struct pw_context *context)
+{
+	struct pw_protocol *protocol;
+
+	protocol = pw_context_find_protocol(context, PW_TYPE_INFO_PROTOCOL_Native);
+
+	if (protocol == NULL)
+		return NULL;
+
+	pw_protocol_add_marshal(protocol, &pw_protocol_native_client_node_marshal);
+
+	return protocol;
+}
diff --git a/src/modules/module-client-node/v0/transport.c b/src/modules/module-client-node/v0/transport.c
new file mode 100644
index 0000000..fa84795
--- /dev/null
+++ b/src/modules/module-client-node/v0/transport.c
@@ -0,0 +1,262 @@
+/* PipeWire
+ *
+ * Copyright © 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/mman.h>
+
+#include <spa/utils/ringbuffer.h>
+#include <spa/node/io.h>
+
+#include <pipewire/impl.h>
+#include <pipewire/private.h>
+
+#include "ext-client-node.h"
+
+#include "transport.h"
+
+/** \cond */
+
+#define INPUT_BUFFER_SIZE       (1<<12)
+#define OUTPUT_BUFFER_SIZE      (1<<12)
+
+struct transport {
+	struct pw_client_node0_transport trans;
+
+	struct pw_memblock *mem;
+	size_t offset;
+
+	struct pw_client_node0_message current;
+	uint32_t current_index;
+};
+/** \endcond */
+
+static size_t area_get_size(struct pw_client_node0_area *area)
+{
+	size_t size;
+	size = sizeof(struct pw_client_node0_area);
+	size += area->max_input_ports * sizeof(struct spa_io_buffers);
+	size += area->max_output_ports * sizeof(struct spa_io_buffers);
+	size += sizeof(struct spa_ringbuffer);
+	size += INPUT_BUFFER_SIZE;
+	size += sizeof(struct spa_ringbuffer);
+	size += OUTPUT_BUFFER_SIZE;
+	return size;
+}
+
+static void transport_setup_area(void *p, struct pw_client_node0_transport *trans)
+{
+	struct pw_client_node0_area *a;
+
+	trans->area = a = p;
+	p = SPA_PTROFF(p, sizeof(struct pw_client_node0_area), struct spa_io_buffers);
+
+	trans->inputs = p;
+	p = SPA_PTROFF(p, a->max_input_ports * sizeof(struct spa_io_buffers), void);
+
+	trans->outputs = p;
+	p = SPA_PTROFF(p, a->max_output_ports * sizeof(struct spa_io_buffers), void);
+
+	trans->input_buffer = p;
+	p = SPA_PTROFF(p, sizeof(struct spa_ringbuffer), void);
+
+	trans->input_data = p;
+	p = SPA_PTROFF(p, INPUT_BUFFER_SIZE, void);
+
+	trans->output_buffer = p;
+	p = SPA_PTROFF(p, sizeof(struct spa_ringbuffer), void);
+
+	trans->output_data = p;
+	p = SPA_PTROFF(p, OUTPUT_BUFFER_SIZE, void);
+}
+
+static void transport_reset_area(struct pw_client_node0_transport *trans)
+{
+	uint32_t i;
+	struct pw_client_node0_area *a = trans->area;
+
+	for (i = 0; i < a->max_input_ports; i++) {
+		trans->inputs[i] = SPA_IO_BUFFERS_INIT;
+	}
+	for (i = 0; i < a->max_output_ports; i++) {
+		trans->outputs[i] = SPA_IO_BUFFERS_INIT;
+	}
+	spa_ringbuffer_init(trans->input_buffer);
+	spa_ringbuffer_init(trans->output_buffer);
+}
+
+static void destroy(struct pw_client_node0_transport *trans)
+{
+	struct transport *impl = (struct transport *) trans;
+
+	pw_log_debug("transport %p: destroy", trans);
+
+	pw_memblock_free(impl->mem);
+	free(impl);
+}
+
+static int add_message(struct pw_client_node0_transport *trans, struct pw_client_node0_message *message)
+{
+	struct transport *impl = (struct transport *) trans;
+	int32_t filled, avail;
+	uint32_t size, index;
+
+	if (impl == NULL || message == NULL)
+		return -EINVAL;
+
+	filled = spa_ringbuffer_get_write_index(trans->output_buffer, &index);
+	avail = OUTPUT_BUFFER_SIZE - filled;
+	size = SPA_POD_SIZE(message);
+	if (avail < (int)size)
+		return -ENOSPC;
+
+	spa_ringbuffer_write_data(trans->output_buffer,
+				  trans->output_data, OUTPUT_BUFFER_SIZE,
+				  index & (OUTPUT_BUFFER_SIZE - 1), message, size);
+	spa_ringbuffer_write_update(trans->output_buffer, index + size);
+
+	return 0;
+}
+
+static int next_message(struct pw_client_node0_transport *trans, struct pw_client_node0_message *message)
+{
+	struct transport *impl = (struct transport *) trans;
+	int32_t avail;
+
+	if (impl == NULL || message == NULL)
+		return -EINVAL;
+
+	avail = spa_ringbuffer_get_read_index(trans->input_buffer, &impl->current_index);
+	if (avail < (int) sizeof(struct pw_client_node0_message))
+		return 0;
+
+	spa_ringbuffer_read_data(trans->input_buffer,
+				 trans->input_data, INPUT_BUFFER_SIZE,
+				 impl->current_index & (INPUT_BUFFER_SIZE - 1),
+				 &impl->current, sizeof(struct pw_client_node0_message));
+
+	if (avail < (int) SPA_POD_SIZE(&impl->current))
+		return 0;
+
+	*message = impl->current;
+
+	return 1;
+}
+
+static int parse_message(struct pw_client_node0_transport *trans, void *message)
+{
+	struct transport *impl = (struct transport *) trans;
+	uint32_t size;
+
+	if (impl == NULL || message == NULL)
+		return -EINVAL;
+
+	size = SPA_POD_SIZE(&impl->current);
+
+	spa_ringbuffer_read_data(trans->input_buffer,
+				 trans->input_data, INPUT_BUFFER_SIZE,
+				 impl->current_index & (INPUT_BUFFER_SIZE - 1), message, size);
+	spa_ringbuffer_read_update(trans->input_buffer, impl->current_index + size);
+
+	return 0;
+}
+
+/** Create a new transport
+ * \param max_input_ports maximum number of input_ports
+ * \param max_output_ports maximum number of output_ports
+ * \return a newly allocated \ref pw_client_node0_transport
+ * \memberof pw_client_node0_transport
+ */
+struct pw_client_node0_transport *
+pw_client_node0_transport_new(struct pw_context *context,
+		uint32_t max_input_ports, uint32_t max_output_ports)
+{
+	struct transport *impl;
+	struct pw_client_node0_transport *trans;
+	struct pw_client_node0_area area = { 0 };
+
+	area.max_input_ports = max_input_ports;
+	area.n_input_ports = 0;
+	area.max_output_ports = max_output_ports;
+	area.n_output_ports = 0;
+
+	impl = calloc(1, sizeof(struct transport));
+	if (impl == NULL)
+		return NULL;
+
+	pw_log_debug("transport %p: new %d %d", impl, max_input_ports, max_output_ports);
+
+	trans = &impl->trans;
+	impl->offset = 0;
+
+	impl->mem = pw_mempool_alloc(context->pool,
+			PW_MEMBLOCK_FLAG_READWRITE |
+			PW_MEMBLOCK_FLAG_MAP |
+			PW_MEMBLOCK_FLAG_SEAL,
+			SPA_DATA_MemFd, area_get_size(&area));
+	if (impl->mem == NULL) {
+		free(impl);
+		return NULL;
+	}
+
+	memcpy(impl->mem->map->ptr, &area, sizeof(struct pw_client_node0_area));
+	transport_setup_area(impl->mem->map->ptr, trans);
+	transport_reset_area(trans);
+
+	trans->destroy = destroy;
+	trans->add_message = add_message;
+	trans->next_message = next_message;
+	trans->parse_message = parse_message;
+
+	return trans;
+}
+
+struct pw_client_node0_transport *
+pw_client_node0_transport_new_from_info(struct pw_client_node0_transport_info *info)
+{
+	errno = ENOTSUP;
+	return NULL;
+}
+
+/** Get transport info
+ * \param trans the transport to get info of
+ * \param[out] info transport info
+ * \return 0 on success
+ *
+ * Fill \a info with the transport info of \a trans. This information can be
+ * passed to the client to set up the shared transport.
+ *
+ * \memberof pw_client_node0_transport
+ */
+int pw_client_node0_transport_get_info(struct pw_client_node0_transport *trans,
+				      struct pw_client_node0_transport_info *info)
+{
+	struct transport *impl = (struct transport *) trans;
+
+	info->memfd = impl->mem->fd;
+	info->offset = impl->offset;
+	info->size = impl->mem->size;
+
+	return 0;
+}
diff --git a/src/modules/module-client-node/v0/transport.h b/src/modules/module-client-node/v0/transport.h
new file mode 100644
index 0000000..3abcd6d
--- /dev/null
+++ b/src/modules/module-client-node/v0/transport.h
@@ -0,0 +1,59 @@
+/* PipeWire
+ *
+ * Copyright © 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __PIPEWIRE_CLIENT_NODE0_TRANSPORT_H__
+#define __PIPEWIRE_CLIENT_NODE0_TRANSPORT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <string.h>
+
+#include <spa/utils/defs.h>
+
+#include <pipewire/mem.h>
+
+/** information about the transport region \memberof pw_client_node */
+struct pw_client_node0_transport_info {
+	int memfd;		/**< the memfd of the transport area */
+	uint32_t offset;	/**< offset to map \a memfd at */
+	uint32_t size;		/**< size of memfd mapping */
+};
+
+struct pw_client_node0_transport *
+pw_client_node0_transport_new(struct pw_context *context, uint32_t max_input_ports, uint32_t max_output_ports);
+
+struct pw_client_node0_transport *
+pw_client_node0_transport_new_from_info(struct pw_client_node0_transport_info *info);
+
+int
+pw_client_node0_transport_get_info(struct pw_client_node0_transport *trans,
+				  struct pw_client_node0_transport_info *info);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* __PIPEWIRE_CLIENT_NODE0_TRANSPORT_H__ */