Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

7 files changed, 1444 insertions, 0 deletions

diff --git a/third_party/pipewire/spa/node/command.h b/third_party/pipewire/spa/node/command.h
new file mode 100644
index 0000000000..9bf50fb5e4
--- /dev/null
+++ b/third_party/pipewire/spa/node/command.h
@@ -0,0 +1,73 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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 SPA_COMMAND_NODE_H
+#define SPA_COMMAND_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <spa/pod/command.h>
+
+/* object id of SPA_TYPE_COMMAND_Node */
+enum spa_node_command {
+	SPA_NODE_COMMAND_Suspend,	/**< suspend a node, this removes all configured
+					  * formats and closes any devices */
+	SPA_NODE_COMMAND_Pause,		/**< pause a node. this makes it stop emitting
+					  *  scheduling events */
+	SPA_NODE_COMMAND_Start,		/**< start a node, this makes it start emitting
+					  *  scheduling events */
+	SPA_NODE_COMMAND_Enable,
+	SPA_NODE_COMMAND_Disable,
+	SPA_NODE_COMMAND_Flush,
+	SPA_NODE_COMMAND_Drain,
+	SPA_NODE_COMMAND_Marker,
+	SPA_NODE_COMMAND_ParamBegin,	/**< begin a set of parameter enumerations or
+					  *  configuration that require the device to
+					  *  remain opened, like query formats and then
+					  *  set a format */
+	SPA_NODE_COMMAND_ParamEnd,	/**< end a transaction */
+	SPA_NODE_COMMAND_RequestProcess,/**< Sent to a driver when some other node emitted
+					  *  the RequestProcess event. */
+};
+
+#define SPA_NODE_COMMAND_ID(cmd)	SPA_COMMAND_ID(cmd, SPA_TYPE_COMMAND_Node)
+#define SPA_NODE_COMMAND_INIT(id)	SPA_COMMAND_INIT(SPA_TYPE_COMMAND_Node, id)
+
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_COMMAND_NODE_H */
diff --git a/third_party/pipewire/spa/node/event.h b/third_party/pipewire/spa/node/event.h
new file mode 100644
index 0000000000..ceb6d60164
--- /dev/null
+++ b/third_party/pipewire/spa/node/event.h
@@ -0,0 +1,64 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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 SPA_EVENT_NODE_H
+#define SPA_EVENT_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <spa/pod/event.h>
+
+/* object id of SPA_TYPE_EVENT_Node */
+enum spa_node_event {
+	SPA_NODE_EVENT_Error,
+	SPA_NODE_EVENT_Buffering,
+	SPA_NODE_EVENT_RequestRefresh,
+	SPA_NODE_EVENT_RequestProcess,		/*< Ask the driver to start processing
+						 *  the graph */
+};
+
+#define SPA_NODE_EVENT_ID(ev)	SPA_EVENT_ID(ev, SPA_TYPE_EVENT_Node)
+#define SPA_NODE_EVENT_INIT(id) SPA_EVENT_INIT(SPA_TYPE_EVENT_Node, id)
+
+/* properties for SPA_TYPE_EVENT_Node */
+enum spa_event_node {
+	SPA_EVENT_NODE_START,
+};
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_EVENT_NODE_H */
diff --git a/third_party/pipewire/spa/node/io.h b/third_party/pipewire/spa/node/io.h
new file mode 100644
index 0000000000..74635c79a5
--- /dev/null
+++ b/third_party/pipewire/spa/node/io.h
@@ -0,0 +1,304 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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 SPA_IO_H
+#define SPA_IO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <spa/utils/defs.h>
+#include <spa/pod/pod.h>
+
+/** IO areas
+ *
+ * IO information for a port on a node. This is allocated
+ * by the host and configured on a node or all ports for which
+ * IO is requested.
+ *
+ * The plugin will communicate with the host through the IO
+ * areas.
+ */
+
+/** Different IO area types */
+enum spa_io_type {
+	SPA_IO_Invalid,
+	SPA_IO_Buffers,		/**< area to exchange buffers, struct spa_io_buffers */
+	SPA_IO_Range,		/**< expected byte range, struct spa_io_range */
+	SPA_IO_Clock,		/**< area to update clock information, struct spa_io_clock */
+	SPA_IO_Latency,		/**< latency reporting, struct spa_io_latency */
+	SPA_IO_Control,		/**< area for control messages, struct spa_io_sequence */
+	SPA_IO_Notify,		/**< area for notify messages, struct spa_io_sequence */
+	SPA_IO_Position,	/**< position information in the graph, struct spa_io_position */
+	SPA_IO_RateMatch,	/**< rate matching between nodes, struct spa_io_rate_match */
+	SPA_IO_Memory,		/**< memory pointer, struct spa_io_memory */
+};
+
+/**
+ * IO area to exchange buffers.
+ *
+ * A set of buffers should first be configured on the node/port.
+ * Further references to those buffers will be made by using the
+ * id of the buffer.
+ *
+ * If status is SPA_STATUS_OK, the host should ignore
+ * the io area.
+ *
+ * If status is SPA_STATUS_NEED_DATA, the host should:
+ * 1) recycle the buffer in buffer_id, if possible
+ * 2) prepare a new buffer and place the id in buffer_id.
+ *
+ * If status is SPA_STATUS_HAVE_DATA, the host should consume
+ * the buffer in buffer_id and set the state to
+ * SPA_STATUS_NEED_DATA when new data is requested.
+ *
+ * If status is SPA_STATUS_STOPPED, some error occurred on the
+ * port.
+ *
+ * If status is SPA_STATUS_DRAINED, data from the io area was
+ * used to drain.
+ *
+ * Status can also be a negative errno value to indicate errors.
+ * such as:
+ * -EINVAL: buffer_id is invalid
+ * -EPIPE: no more buffers available
+ */
+struct spa_io_buffers {
+#define SPA_STATUS_OK			0
+#define SPA_STATUS_NEED_DATA		(1<<0)
+#define SPA_STATUS_HAVE_DATA		(1<<1)
+#define SPA_STATUS_STOPPED		(1<<2)
+#define SPA_STATUS_DRAINED		(1<<3)
+	int32_t status;			/**< the status code */
+	uint32_t buffer_id;		/**< a buffer id */
+};
+
+#define SPA_IO_BUFFERS_INIT  (struct spa_io_buffers) { SPA_STATUS_OK, SPA_ID_INVALID, }
+
+/**
+ * IO area to exchange a memory region
+ */
+struct spa_io_memory {
+	int32_t status;			/**< the status code */
+	uint32_t size;			/**< the size of \a data */
+	void *data;			/**< a memory pointer */
+};
+#define SPA_IO_MEMORY_INIT  (struct spa_io_memory) { SPA_STATUS_OK, 0, NULL, }
+
+/** A range, suitable for input ports that can suggest a range to output ports */
+struct spa_io_range {
+	uint64_t offset;	/**< offset in range */
+	uint32_t min_size;	/**< minimum size of data */
+	uint32_t max_size;	/**< maximum size of data */
+};
+
+/**
+ * Absolute time reporting.
+ *
+ * Nodes that can report clocking information will receive this io block.
+ * The application sets the id. This is usually set as part of the
+ * position information but can also be set separately.
+ *
+ * The clock counts the elapsed time according to the clock provider
+ * since the provider was last started.
+ */
+struct spa_io_clock {
+#define SPA_IO_CLOCK_FLAG_FREEWHEEL (1u<<0)
+	uint32_t flags;			/**< clock flags */
+	uint32_t id;			/**< unique clock id, set by application */
+	char name[64];			/**< clock name prefixed with API, set by node. The clock name
+					  *  is unique per clock and can be used to check if nodes
+					  *  share the same clock. */
+	uint64_t nsec;			/**< time in nanoseconds against monotonic clock */
+	struct spa_fraction rate;	/**< rate for position/duration/delay */
+	uint64_t position;		/**< current position */
+	uint64_t duration;		/**< duration of current cycle */
+	int64_t delay;			/**< delay between position and hardware,
+					  *  positive for capture, negative for playback */
+	double rate_diff;		/**< rate difference between clock and monotonic time */
+	uint64_t next_nsec;		/**< estimated next wakeup time in nanoseconds */
+	uint32_t padding[8];
+};
+
+/* the size of the video in this cycle */
+struct spa_io_video_size {
+#define SPA_IO_VIDEO_SIZE_VALID		(1<<0)
+	uint32_t flags;			/**< optional flags */
+	uint32_t stride;		/**< video stride in bytes */
+	struct spa_rectangle size;	/**< the video size */
+	struct spa_fraction framerate;  /**< the minimum framerate, the cycle duration is
+					  *  always smaller to ensure there is only one
+					  *  video frame per cycle. */
+	uint32_t padding[4];
+};
+
+/** latency reporting */
+struct spa_io_latency {
+	struct spa_fraction rate;	/**< rate for min/max */
+	uint64_t min;			/**< min latency */
+	uint64_t max;			/**< max latency */
+};
+
+/** control stream, io area for SPA_IO_Control and SPA_IO_Notify */
+struct spa_io_sequence {
+	struct spa_pod_sequence sequence;	/**< sequence of timed events */
+};
+
+/** bar and beat segment */
+struct spa_io_segment_bar {
+#define SPA_IO_SEGMENT_BAR_FLAG_VALID		(1<<0)
+	uint32_t flags;			/**< extra flags */
+	uint32_t offset;		/**< offset in segment of this beat */
+	float signature_num;		/**< time signature numerator */
+	float signature_denom;		/**< time signature denominator */
+	double bpm;			/**< beats per minute */
+	double beat;			/**< current beat in segment */
+	uint32_t padding[8];
+};
+
+/** video frame segment */
+struct spa_io_segment_video {
+#define SPA_IO_SEGMENT_VIDEO_FLAG_VALID		(1<<0)
+#define SPA_IO_SEGMENT_VIDEO_FLAG_DROP_FRAME	(1<<1)
+#define SPA_IO_SEGMENT_VIDEO_FLAG_PULL_DOWN	(1<<2)
+#define SPA_IO_SEGMENT_VIDEO_FLAG_INTERLACED	(1<<3)
+	uint32_t flags;			/**< flags */
+	uint32_t offset;		/**< offset in segment */
+	struct spa_fraction framerate;
+	uint32_t hours;
+	uint32_t minutes;
+	uint32_t seconds;
+	uint32_t frames;
+	uint32_t field_count;		/**< 0 for progressive, 1 and 2 for interlaced */
+	uint32_t padding[11];
+};
+
+/**
+ * A segment converts a running time to a segment (stream) position.
+ *
+ * The segment position is valid when the current running time is between
+ * start and start + duration. The position is then
+ * calculated as:
+ *
+ *   (running time - start) * rate + position;
+ *
+ * Support for looping is done by specifying the LOOPING flags with a
+ * non-zero duration. When the running time reaches start + duration,
+ * duration is added to start and the loop repeats.
+ *
+ * Care has to be taken when the running time + clock.duration extends
+ * past the start + duration from the segment; the user should correctly
+ * wrap around and partially repeat the loop in the current cycle.
+ *
+ * Extra information can be placed in the segment by setting the valid flags
+ * and filling up the corresponding structures.
+ */
+struct spa_io_segment {
+	uint32_t version;
+#define SPA_IO_SEGMENT_FLAG_LOOPING	(1<<0)	/**< after the duration, the segment repeats */
+#define SPA_IO_SEGMENT_FLAG_NO_POSITION	(1<<1)	/**< position is invalid. The position can be invalid
+						  *  after a seek, for example, when the exact mapping
+						  *  of the extra segment info (bar, video, ...) to
+						  *  position has not been determined yet */
+	uint32_t flags;				/**< extra flags */
+	uint64_t start;				/**< value of running time when this
+						  *  info is active. Can be in the future for
+						  *  pending changes. It does not have to be in
+						  *  exact multiples of the clock duration. */
+	uint64_t duration;			/**< duration when this info becomes invalid expressed
+						  *  in running time. If the duration is 0, this
+						  *  segment extends to the next segment. If the
+						  *  segment becomes invalid and the looping flag is
+						  *  set, the segment repeats. */
+	double rate;				/**< overall rate of the segment, can be negative for
+						  *  backwards time reporting. */
+	uint64_t position;			/**< The position when the running time == start.
+						  *  can be invalid when the owner of the extra segment
+						  *  information has not yet made the mapping. */
+
+	struct spa_io_segment_bar bar;
+	struct spa_io_segment_video video;
+};
+
+enum spa_io_position_state {
+	SPA_IO_POSITION_STATE_STOPPED,
+	SPA_IO_POSITION_STATE_STARTING,
+	SPA_IO_POSITION_STATE_RUNNING,
+};
+
+/** the maximum number of segments visible in the future */
+#define SPA_IO_POSITION_MAX_SEGMENTS	8
+
+/**
+ * The position information adds extra meaning to the raw clock times.
+ *
+ * It is set on all nodes and the clock id will contain the clock of the
+ * driving node in the graph.
+ *
+ * The position information contains 1 or more segments that convert the
+ * raw clock times to a stream time. They are sorted based on their
+ * start times, and thus the order in which they will activate in
+ * the future. This makes it possible to look ahead in the scheduled
+ * segments and anticipate the changes in the timeline.
+ */
+struct spa_io_position {
+	struct spa_io_clock clock;		/**< clock position of driver, always valid and
+						  *  read only */
+	struct spa_io_video_size video;		/**< size of the video in the current cycle */
+	int64_t offset;				/**< an offset to subtract from the clock position
+						  *  to get a running time. This is the time that
+						  *  the state has been in the RUNNING state and the
+						  *  time that should be used to compare the segment
+						  *  start values against. */
+	uint32_t state;				/**< one of enum spa_io_position_state */
+
+	uint32_t n_segments;			/**< number of segments */
+	struct spa_io_segment segments[SPA_IO_POSITION_MAX_SEGMENTS];	/**< segments */
+};
+
+/** rate matching */
+struct spa_io_rate_match {
+	uint32_t delay;			/**< extra delay in samples for resampler */
+	uint32_t size;			/**< requested input size for resampler */
+	double rate;			/**< rate for resampler */
+#define SPA_IO_RATE_MATCH_FLAG_ACTIVE	(1 << 0)
+	uint32_t flags;			/**< extra flags */
+	uint32_t padding[7];
+};
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_IO_H */
diff --git a/third_party/pipewire/spa/node/keys.h b/third_party/pipewire/spa/node/keys.h
new file mode 100644
index 0000000000..94a02852de
--- /dev/null
+++ b/third_party/pipewire/spa/node/keys.h
@@ -0,0 +1,64 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2019 Wim Taymans
+ *
+ * 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 SPA_NODE_KEYS_H
+#define SPA_NODE_KEYS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+/** node keys */
+#define SPA_KEY_NODE_NAME		"node.name"		/**< a node name */
+#define SPA_KEY_NODE_LATENCY		"node.latency"		/**< the requested node latency */
+#define SPA_KEY_NODE_MAX_LATENCY	"node.max-latency"	/**< maximum supported latency */
+
+#define SPA_KEY_NODE_DRIVER		"node.driver"		/**< the node can be a driver */
+#define SPA_KEY_NODE_ALWAYS_PROCESS	"node.always-process"	/**< call the process function even if
+								  *  not linked. */
+#define SPA_KEY_NODE_PAUSE_ON_IDLE	"node.pause-on-idle"	/**< if the node should be paused
+								  *  immediately when idle. */
+#define SPA_KEY_NODE_MONITOR		"node.monitor"		/**< the node has monitor ports */
+
+
+/** port keys */
+#define SPA_KEY_PORT_NAME		"port.name"		/**< a port name */
+#define SPA_KEY_PORT_ALIAS		"port.alias"		/**< a port alias */
+#define SPA_KEY_PORT_MONITOR		"port.monitor"		/**< this port is a monitor port */
+
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_NODE_KEYS_H */
diff --git a/third_party/pipewire/spa/node/node.h b/third_party/pipewire/spa/node/node.h
new file mode 100644
index 0000000000..f32adec16c
--- /dev/null
+++ b/third_party/pipewire/spa/node/node.h
@@ -0,0 +1,674 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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 SPA_NODE_H
+#define SPA_NODE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \defgroup spa_node Node
+ *
+ * A spa_node is a component that can consume and produce buffers.
+ */
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <errno.h>
+#include <spa/utils/defs.h>
+#include <spa/utils/type.h>
+#include <spa/utils/hook.h>
+#include <spa/buffer/buffer.h>
+#include <spa/node/event.h>
+#include <spa/node/command.h>
+
+
+#define SPA_TYPE_INTERFACE_Node		SPA_TYPE_INFO_INTERFACE_BASE "Node"
+
+#define SPA_VERSION_NODE		0
+struct spa_node { struct spa_interface iface; };
+
+/**
+ * Node information structure
+ *
+ * Contains the basic node information.
+ */
+struct spa_node_info {
+	uint32_t max_input_ports;
+	uint32_t max_output_ports;
+#define SPA_NODE_CHANGE_MASK_FLAGS		(1u<<0)
+#define SPA_NODE_CHANGE_MASK_PROPS		(1u<<1)
+#define SPA_NODE_CHANGE_MASK_PARAMS		(1u<<2)
+	uint64_t change_mask;
+
+#define SPA_NODE_FLAG_RT			(1u<<0)	/**< node can do real-time processing */
+#define SPA_NODE_FLAG_IN_DYNAMIC_PORTS		(1u<<1)	/**< input ports can be added/removed */
+#define SPA_NODE_FLAG_OUT_DYNAMIC_PORTS		(1u<<2)	/**< output ports can be added/removed */
+#define SPA_NODE_FLAG_IN_PORT_CONFIG		(1u<<3)	/**< input ports can be reconfigured with
+							  *  PortConfig parameter */
+#define SPA_NODE_FLAG_OUT_PORT_CONFIG		(1u<<4)	/**< output ports can be reconfigured with
+							  *  PortConfig parameter */
+#define SPA_NODE_FLAG_NEED_CONFIGURE		(1u<<5)	/**< node needs configuration before it can
+							  *  be started. */
+#define SPA_NODE_FLAG_ASYNC			(1u<<6)	/**< the process function might not
+							  *  immediately produce or consume data
+							  *  but might offload the work to a worker
+							  *  thread. */
+	uint64_t flags;
+	struct spa_dict *props;			/**< extra node properties */
+	struct spa_param_info *params;		/**< parameter information */
+	uint32_t n_params;			/**< number of items in \a params */
+};
+
+#define SPA_NODE_INFO_INIT()	(struct spa_node_info) { 0, }
+
+/**
+ * Port information structure
+ *
+ * Contains the basic port information.
+ */
+struct spa_port_info {
+#define SPA_PORT_CHANGE_MASK_FLAGS		(1u<<0)
+#define SPA_PORT_CHANGE_MASK_RATE		(1u<<1)
+#define SPA_PORT_CHANGE_MASK_PROPS		(1u<<2)
+#define SPA_PORT_CHANGE_MASK_PARAMS		(1u<<3)
+	uint64_t change_mask;
+
+#define SPA_PORT_FLAG_REMOVABLE			(1u<<0)	/**< port can be removed */
+#define SPA_PORT_FLAG_OPTIONAL			(1u<<1)	/**< processing on port is optional */
+#define SPA_PORT_FLAG_CAN_ALLOC_BUFFERS		(1u<<2)	/**< the port can allocate buffer data */
+#define SPA_PORT_FLAG_IN_PLACE			(1u<<3)	/**< the port can process data in-place and
+							 *   will need a writable input buffer */
+#define SPA_PORT_FLAG_NO_REF			(1u<<4)	/**< the port does not keep a ref on the buffer.
+							 *   This means the node will always completely
+							 *   consume the input buffer and it will be
+							 *   recycled after process. */
+#define SPA_PORT_FLAG_LIVE			(1u<<5)	/**< output buffers from this port are
+							 *   timestamped against a live clock. */
+#define SPA_PORT_FLAG_PHYSICAL			(1u<<6)	/**< connects to some device */
+#define SPA_PORT_FLAG_TERMINAL			(1u<<7)	/**< data was not created from this port
+							 *   or will not be made available on another
+							 *   port */
+#define SPA_PORT_FLAG_DYNAMIC_DATA		(1u<<8)	/**< data pointer on buffers can be changed.
+							 *   Only the buffer data marked as DYNAMIC
+							 *   can be changed. */
+	uint64_t flags;				/**< port flags */
+	struct spa_fraction rate;		/**< rate of sequence numbers on port */
+	const struct spa_dict *props;		/**< extra port properties */
+	struct spa_param_info *params;		/**< parameter information */
+	uint32_t n_params;			/**< number of items in \a params */
+};
+
+#define SPA_PORT_INFO_INIT()	(struct spa_port_info) { 0, }
+
+#define SPA_RESULT_TYPE_NODE_ERROR	1
+#define SPA_RESULT_TYPE_NODE_PARAMS	2
+
+/** an error result */
+struct spa_result_node_error {
+	const char *message;
+};
+
+/** the result of enum_params or port_enum_params. */
+struct spa_result_node_params {
+	uint32_t id;		/**< id of parameter */
+	uint32_t index;		/**< index of parameter */
+	uint32_t next;		/**< next index of iteration */
+	struct spa_pod *param;	/**< the result param */
+};
+
+#define SPA_NODE_EVENT_INFO		0
+#define SPA_NODE_EVENT_PORT_INFO	1
+#define SPA_NODE_EVENT_RESULT		2
+#define SPA_NODE_EVENT_EVENT		3
+#define SPA_NODE_EVENT_NUM		4
+
+/** events from the spa_node.
+ *
+ * All event are called from the main thread and multiple
+ * listeners can be registered for the events with
+ * spa_node_add_listener().
+ */
+struct spa_node_events {
+#define SPA_VERSION_NODE_EVENTS	0
+	uint32_t version;	/**< version of this structure */
+
+	/** Emitted when info changes */
+	void (*info) (void *data, const struct spa_node_info *info);
+
+	/** Emitted when port info changes, NULL when port is removed */
+	void (*port_info) (void *data,
+			enum spa_direction direction, uint32_t port,
+			const struct spa_port_info *info);
+
+	/** notify a result.
+	 *
+	 * Some methods will trigger a result event with an optional
+	 * result of the given type. Look at the documentation of the
+	 * method to know when to expect a result event.
+	 *
+	 * The result event can be called synchronously, as an event
+	 * called from inside the method itself, in which case the seq
+	 * number passed to the method will be passed unchanged.
+	 *
+	 * The result event will be called asynchronously when the
+	 * method returned an async return value. In this case, the seq
+	 * number in the result will match the async return value of
+	 * the method call. Users should match the seq number from
+	 * request to the reply.
+	 */
+	void (*result) (void *data, int seq, int res,
+			uint32_t type, const void *result);
+
+	/**
+	 * \param node a spa_node
+	 * \param event the event that was emitted
+	 *
+	 * This will be called when an out-of-bound event is notified
+	 * on \a node.
+	 */
+	void (*event) (void *data, const struct spa_event *event);
+};
+
+#define SPA_NODE_CALLBACK_READY		0
+#define SPA_NODE_CALLBACK_REUSE_BUFFER	1
+#define SPA_NODE_CALLBACK_XRUN		2
+#define SPA_NODE_CALLBACK_NUM		3
+
+/** Node callbacks
+ *
+ * Callbacks are called from the real-time data thread. Only
+ * one callback structure can be set on an spa_node.
+ */
+struct spa_node_callbacks {
+#define SPA_VERSION_NODE_CALLBACKS	0
+	uint32_t version;
+	/**
+	 * \param node a spa_node
+	 *
+	 * The node is ready for processing.
+	 *
+	 * When this function is NULL, synchronous operation is requested
+	 * on the ports.
+	 */
+	int (*ready) (void *data, int state);
+
+	/**
+	 * \param node a spa_node
+	 * \param port_id an input port_id
+	 * \param buffer_id the buffer id to be reused
+	 *
+	 * The node has a buffer that can be reused.
+	 *
+	 * When this function is NULL, the buffers to reuse will be set in
+	 * the io area of the input ports.
+	 */
+	int (*reuse_buffer) (void *data,
+			     uint32_t port_id,
+			     uint32_t buffer_id);
+
+	/**
+	 * \param data user data
+	 * \param trigger the timestamp in microseconds when the xrun happened
+	 * \param delay the amount of microseconds of xrun.
+	 * \param info an object with extra info (NULL for now)
+	 *
+	 * The node has encountered an over or underrun
+	 *
+	 * The info contains an object with more information
+	 */
+	int (*xrun) (void *data, uint64_t trigger, uint64_t delay,
+			struct spa_pod *info);
+};
+
+
+/** flags that can be passed to set_param and port_set_param functions */
+#define SPA_NODE_PARAM_FLAG_TEST_ONLY	(1 << 0)	/**< Just check if the param is accepted */
+#define SPA_NODE_PARAM_FLAG_FIXATE	(1 << 1)	/**< Fixate the non-optional unset fields */
+#define SPA_NODE_PARAM_FLAG_NEAREST	(1 << 2)	/**< Allow set fields to be rounded to the
+							  *  nearest allowed field value. */
+
+/** flags to pass to the use_buffers functions */
+#define SPA_NODE_BUFFERS_FLAG_ALLOC	(1 << 0)	/**< Allocate memory for the buffers. This flag
+							  *  is ignored when the port does not have the
+							  *  SPA_PORT_FLAG_CAN_ALLOC_BUFFERS set. */
+
+
+#define SPA_NODE_METHOD_ADD_LISTENER		0
+#define SPA_NODE_METHOD_SET_CALLBACKS		1
+#define SPA_NODE_METHOD_SYNC			2
+#define SPA_NODE_METHOD_ENUM_PARAMS		3
+#define SPA_NODE_METHOD_SET_PARAM		4
+#define SPA_NODE_METHOD_SET_IO			5
+#define SPA_NODE_METHOD_SEND_COMMAND		6
+#define SPA_NODE_METHOD_ADD_PORT		7
+#define SPA_NODE_METHOD_REMOVE_PORT		8
+#define SPA_NODE_METHOD_PORT_ENUM_PARAMS	9
+#define SPA_NODE_METHOD_PORT_SET_PARAM		10
+#define SPA_NODE_METHOD_PORT_USE_BUFFERS	11
+#define SPA_NODE_METHOD_PORT_SET_IO		12
+#define SPA_NODE_METHOD_PORT_REUSE_BUFFER	13
+#define SPA_NODE_METHOD_PROCESS			14
+#define SPA_NODE_METHOD_NUM			15
+
+/**
+ * Node methods
+ */
+struct spa_node_methods {
+	/* the version of the node methods. This can be used to expand this
+	 * structure in the future */
+#define SPA_VERSION_NODE_METHODS	0
+	uint32_t version;
+
+	/**
+	 * Adds an event listener on \a node.
+	 *
+	 * Setting the events will trigger the info event and a
+	 * port_info event for each managed port on the new
+	 * listener.
+	 *
+	 * \param node a #spa_node
+	 * \param listener a listener
+	 * \param events a struct \ref spa_node_events
+	 * \param data data passed as first argument in functions of \a events
+	 * \return 0 on success
+	 *	   < 0 errno on error
+	 */
+	int (*add_listener) (void *object,
+			struct spa_hook *listener,
+			const struct spa_node_events *events,
+			void *data);
+	/**
+	 * Set callbacks to on \a node.
+	 * if \a callbacks is NULL, the current callbacks are removed.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * All callbacks are called from the data thread.
+	 *
+	 * \param node a spa_node
+	 * \param callbacks callbacks to set
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL
+	 */
+	int (*set_callbacks) (void *object,
+			      const struct spa_node_callbacks *callbacks,
+			      void *data);
+	/**
+	 * Perform a sync operation.
+	 *
+	 * This method will emit the result event with the given sequence
+	 * number synchronously or with the returned async return value
+	 * asynchronously.
+	 *
+	 * Because all methods are serialized in the node, this can be used
+	 * to wait for completion of all previous method calls.
+	 *
+	 * \param seq a sequence number
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL
+	 *         an async result
+	 */
+	int (*sync) (void *object, int seq);
+
+	/**
+	 * Enumerate the parameters of a node.
+	 *
+	 * Parameters are identified with an \a id. Some parameters can have
+	 * multiple values, see the documentation of the parameter id.
+	 *
+	 * Parameters can be filtered by passing a non-NULL \a filter.
+	 *
+	 * The function will emit the result event up to \a max times with
+	 * the result value. The seq in the result will either be the \a seq
+	 * number when executed synchronously or the async return value of
+	 * this function when executed asynchronously.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a \ref spa_node
+	 * \param seq a sequence number to pass to the result event when
+	 *	this method is executed synchronously.
+	 * \param id the param id to enumerate
+	 * \param start the index of enumeration, pass 0 for the first item
+	 * \param max the maximum number of parameters to enumerate
+	 * \param filter and optional filter to use
+	 *
+	 * \return 0 when no more items can be iterated.
+	 *         -EINVAL when invalid arguments are given
+	 *         -ENOENT the parameter \a id is unknown
+	 *         -ENOTSUP when there are no parameters
+	 *                 implemented on \a node
+	 *         an async return value when the result event will be
+	 *             emitted later.
+	 */
+	int (*enum_params) (void *object, int seq,
+			    uint32_t id, uint32_t start, uint32_t max,
+			    const struct spa_pod *filter);
+
+	/**
+	 * Set the configurable parameter in \a node.
+	 *
+	 * Usually, \a param will be obtained from enum_params and then
+	 * modified but it is also possible to set another spa_pod
+	 * as long as its keys and types match a supported object.
+	 *
+	 * Objects with property keys that are not known are ignored.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a \ref spa_node
+	 * \param id the parameter id to configure
+	 * \param flags additional flags
+	 * \param param the parameter to configure
+	 *
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL
+	 *         -ENOTSUP when there are no parameters implemented on \a node
+	 *         -ENOENT the parameter is unknown
+	 */
+	int (*set_param) (void *object,
+			  uint32_t id, uint32_t flags,
+			  const struct spa_pod *param);
+
+	/**
+	 * Configure the given memory area with \a id on \a node. This
+	 * structure is allocated by the host and is used to exchange
+	 * data and parameters with the node.
+	 *
+	 * Setting an \a io of NULL will disable the node io.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param id the id of the io area, the available ids can be
+	 *        enumerated with the node parameters.
+	 * \param data a io area memory
+	 * \param size the size of \a data
+	 * \return 0 on success
+	 *         -EINVAL when invalid input is given
+	 *         -ENOENT when \a id is unknown
+	 *         -ENOSPC when \a size is too small
+	 */
+	int (*set_io) (void *object,
+		       uint32_t id, void *data, size_t size);
+
+	/**
+	 * Send a command to a node.
+	 *
+	 * Upon completion, a command might change the state of a node.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a  spa_node
+	 * \param command a spa_command
+	 * \return 0 on success
+	 *         -EINVAL when node or command is NULL
+	 *         -ENOTSUP when this node can't process commands
+	 *         -EINVAL \a command is an invalid command
+	 */
+	int (*send_command) (void *object, const struct spa_command *command);
+
+	/**
+	 * Make a new port with \a port_id. The caller should use the lowest unused
+	 * port id for the given \a direction.
+	 *
+	 * Port ids should be between 0 and max_ports as obtained from the info
+	 * event.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a  spa_node
+	 * \param direction a enum \ref spa_direction
+	 * \param port_id an unused port id
+	 * \param props extra properties
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL
+	 */
+	int (*add_port) (void *object,
+			enum spa_direction direction, uint32_t port_id,
+			const struct spa_dict *props);
+
+	/**
+	 * Remove a port with \a port_id.
+	 *
+	 * \param node a  spa_node
+	 * \param direction a enum \ref spa_direction
+	 * \param port_id a port id
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL or when port_id is unknown or
+	 *		when the port can't be removed.
+	 */
+	int (*remove_port) (void *object,
+			enum spa_direction direction, uint32_t port_id);
+
+	/**
+	 * Enumerate all possible parameters of \a id on \a port_id of \a node
+	 * that are compatible with \a filter.
+	 *
+	 * The result parameters can be queried and modified and ultimately be used
+	 * to call port_set_param.
+	 *
+	 * The function will emit the result event up to \a max times with
+	 * the result value. The seq in the result event will either be the
+	 * \a seq number when executed synchronously or the async return
+	 * value of this function when executed asynchronously.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a spa_node
+	 * \param seq a sequence number to pass to the result event when
+	 *	this method is executed synchronously.
+	 * \param direction an spa_direction
+	 * \param port_id the port to query
+	 * \param id the parameter id to query
+	 * \param start the first index to query, 0 to get the first item
+	 * \param max the maximum number of params to query
+	 * \param filter a parameter filter or NULL for no filter
+	 *
+	 * \return 0 when no more items can be iterated.
+	 *         -EINVAL when invalid parameters are given
+	 *         -ENOENT when \a id is unknown
+	 *         an async return value when the result event will be
+	 *             emitted later.
+	 */
+	int (*port_enum_params) (void *object, int seq,
+				 enum spa_direction direction, uint32_t port_id,
+				 uint32_t id, uint32_t start, uint32_t max,
+				 const struct spa_pod *filter);
+	/**
+	 * Set a parameter on \a port_id of \a node.
+	 *
+	 * When \a param is NULL, the parameter will be unset.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param node a struct \ref spa_node
+	 * \param direction a enum \ref spa_direction
+	 * \param port_id the port to configure
+	 * \param id the parameter id to set
+	 * \param flags optional flags
+	 * \param param a struct \ref spa_pod with the parameter to set
+	 * \return 0 on success
+	 *         1 on success, the value of \a param might have been
+	 *                changed depending on \a flags and the final value can be found by
+	 *                doing port_enum_params.
+	 *         -EINVAL when node is NULL or invalid arguments are given
+	 *         -ESRCH when one of the mandatory param
+	 *                 properties is not specified and SPA_NODE_PARAM_FLAG_FIXATE was
+	 *                 not set in \a flags.
+	 *         -ESRCH when the type or size of a property is not correct.
+	 *         -ENOENT when the param id is not found
+	 */
+	int (*port_set_param) (void *object,
+			       enum spa_direction direction,
+			       uint32_t port_id,
+			       uint32_t id, uint32_t flags,
+			       const struct spa_pod *param);
+
+	/**
+	 * Tell the port to use the given buffers
+	 *
+	 * When \a flags contains SPA_NODE_BUFFERS_FLAG_ALLOC, the data
+	 * in the buffers should point to an array of at least 1 data entry
+	 * with the desired supported type that will be filled by this function.
+	 *
+	 * The port should also have a spa_io_buffers io area configured to exchange
+	 * the buffers with the port.
+	 *
+	 * For an input port, all the buffers will remain dequeued.
+	 * Once a buffer has been queued on a port in the spa_io_buffers,
+	 * it should not be reused until the reuse_buffer callback is notified
+	 * or when the buffer has been returned in the spa_io_buffers of
+	 * the port.
+	 *
+	 * For output ports, all buffers will be queued in the port. When process
+	 * returns SPA_STATUS_HAVE_DATA, buffers are available in one or more
+	 * of the spa_io_buffers areas.
+	 *
+	 * When a buffer can be reused, port_reuse_buffer() should be called or the
+	 * buffer_id should be placed in the spa_io_buffers area before calling
+	 * process.
+	 *
+	 * Passing NULL as \a buffers will remove the reference that the port has
+	 * on the buffers.
+	 *
+	 * When this function returns async, use the spa_node_sync operation to
+	 * wait for completion.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param object an object implementing the interface
+	 * \param direction a port direction
+	 * \param port_id a port id
+	 * \param flags extra flags
+	 * \param buffers an array of buffer pointers
+	 * \param n_buffers number of elements in \a buffers
+	 * \return 0 on success
+	 */
+	int (*port_use_buffers) (void *object,
+				 enum spa_direction direction,
+				 uint32_t port_id,
+				 uint32_t flags,
+				 struct spa_buffer **buffers,
+				 uint32_t n_buffers);
+
+	/**
+	 * Configure the given memory area with \a id on \a port_id. This
+	 * structure is allocated by the host and is used to exchange
+	 * data and parameters with the port.
+	 *
+	 * Setting an \a io of NULL will disable the port io.
+	 *
+	 * This function must be called from the main thread.
+	 *
+	 * \param direction a spa_direction
+	 * \param port_id a port id
+	 * \param id the id of the io area, the available ids can be
+	 *        enumerated with the port parameters.
+	 * \param data a io area memory
+	 * \param size the size of \a data
+	 * \return 0 on success
+	 *         -EINVAL when invalid input is given
+	 *         -ENOENT when \a id is unknown
+	 *         -ENOSPC when \a size is too small
+	 */
+	int (*port_set_io) (void *object,
+			    enum spa_direction direction,
+			    uint32_t port_id,
+			    uint32_t id,
+			    void *data, size_t size);
+
+	/**
+	 * Tell an output port to reuse a buffer.
+	 *
+	 * This function must be called from the data thread.
+	 *
+	 * \param node a spa_node
+	 * \param port_id a port id
+	 * \param buffer_id a buffer id to reuse
+	 * \return 0 on success
+	 *         -EINVAL when node is NULL
+	 */
+	int (*port_reuse_buffer) (void *object, uint32_t port_id, uint32_t buffer_id);
+
+	/**
+	 * Process the node
+	 *
+	 * This function must be called from the data thread.
+	 *
+	 * Output io areas with SPA_STATUS_NEED_DATA will recycle the
+	 * buffers if any.
+	 *
+	 * Input areas with SPA_STATUS_HAVE_DATA are consumed if possible
+	 * and the status is set to SPA_STATUS_NEED_DATA or SPA_STATUS_OK.
+	 *
+	 * When the node has new output buffers, the SPA_STATUS_HAVE_DATA
+	 * bit will be set.
+	 *
+	 * When the node can accept new input in the next cycle, the
+	 * SPA_STATUS_NEED_DATA bit will be set.
+	 */
+	int (*process) (void *object);
+};
+
+#define spa_node_method(o,method,version,...)				\
+({									\
+	int _res = -ENOTSUP;						\
+	struct spa_node *_n = o;					\
+	spa_interface_call_res(&_n->iface,				\
+			struct spa_node_methods, _res,			\
+			method, version, ##__VA_ARGS__);		\
+	_res;								\
+})
+
+#define spa_node_add_listener(n,...)		spa_node_method(n, add_listener, 0, __VA_ARGS__)
+#define spa_node_set_callbacks(n,...)		spa_node_method(n, set_callbacks, 0, __VA_ARGS__)
+#define spa_node_sync(n,...)			spa_node_method(n, sync, 0, __VA_ARGS__)
+#define spa_node_enum_params(n,...)		spa_node_method(n, enum_params, 0, __VA_ARGS__)
+#define spa_node_set_param(n,...)		spa_node_method(n, set_param, 0, __VA_ARGS__)
+#define spa_node_set_io(n,...)			spa_node_method(n, set_io, 0, __VA_ARGS__)
+#define spa_node_send_command(n,...)		spa_node_method(n, send_command, 0, __VA_ARGS__)
+#define spa_node_add_port(n,...)		spa_node_method(n, add_port, 0, __VA_ARGS__)
+#define spa_node_remove_port(n,...)		spa_node_method(n, remove_port, 0, __VA_ARGS__)
+#define spa_node_port_enum_params(n,...)	spa_node_method(n, port_enum_params, 0, __VA_ARGS__)
+#define spa_node_port_set_param(n,...)		spa_node_method(n, port_set_param, 0, __VA_ARGS__)
+#define spa_node_port_use_buffers(n,...)	spa_node_method(n, port_use_buffers, 0, __VA_ARGS__)
+#define spa_node_port_set_io(n,...)		spa_node_method(n, port_set_io, 0, __VA_ARGS__)
+
+#define spa_node_port_reuse_buffer(n,...)	spa_node_method(n, port_reuse_buffer, 0, __VA_ARGS__)
+#define spa_node_process(n)			spa_node_method(n, process, 0)
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_NODE_H */
diff --git a/third_party/pipewire/spa/node/type-info.h b/third_party/pipewire/spa/node/type-info.h
new file mode 100644
index 0000000000..7c481fd663
--- /dev/null
+++ b/third_party/pipewire/spa/node/type-info.h
@@ -0,0 +1,107 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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 SPA_NODE_TYPES_H
+#define SPA_NODE_TYPES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <spa/utils/type-info.h>
+
+#include <spa/node/command.h>
+#include <spa/node/event.h>
+#include <spa/node/io.h>
+
+#define SPA_TYPE_INFO_IO			SPA_TYPE_INFO_ENUM_BASE "IO"
+#define SPA_TYPE_INFO_IO_BASE		SPA_TYPE_INFO_IO ":"
+
+static const struct spa_type_info spa_type_io[] = {
+	{ SPA_IO_Invalid, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Invalid", NULL },
+	{ SPA_IO_Buffers, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Buffers", NULL },
+	{ SPA_IO_Range, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Range", NULL },
+	{ SPA_IO_Clock, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Clock", NULL },
+	{ SPA_IO_Latency, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Latency", NULL },
+	{ SPA_IO_Control, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Control", NULL },
+	{ SPA_IO_Notify, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Notify", NULL },
+	{ SPA_IO_Position, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Position", NULL },
+	{ SPA_IO_RateMatch, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "RateMatch", NULL },
+	{ SPA_IO_Memory, SPA_TYPE_Int, SPA_TYPE_INFO_IO_BASE "Memory", NULL },
+	{ 0, 0, NULL, NULL },
+};
+
+#define SPA_TYPE_INFO_NodeEvent			SPA_TYPE_INFO_EVENT_BASE "Node"
+#define SPA_TYPE_INFO_NODE_EVENT_BASE		SPA_TYPE_INFO_NodeEvent ":"
+
+static const struct spa_type_info spa_type_node_event_id[] = {
+	{ SPA_NODE_EVENT_Error,		 SPA_TYPE_EVENT_Node, SPA_TYPE_INFO_NODE_EVENT_BASE "Error",   NULL },
+	{ SPA_NODE_EVENT_Buffering,	 SPA_TYPE_EVENT_Node, SPA_TYPE_INFO_NODE_EVENT_BASE "Buffering", NULL },
+	{ SPA_NODE_EVENT_RequestRefresh, SPA_TYPE_EVENT_Node, SPA_TYPE_INFO_NODE_EVENT_BASE "RequestRefresh", NULL },
+	{ SPA_NODE_EVENT_RequestProcess, SPA_TYPE_EVENT_Node, SPA_TYPE_INFO_NODE_EVENT_BASE "RequestProcess", NULL },
+	{ 0, 0, NULL, NULL },
+};
+
+static const struct spa_type_info spa_type_node_event[] = {
+	{ SPA_EVENT_NODE_START, SPA_TYPE_Id, SPA_TYPE_INFO_NODE_EVENT_BASE, spa_type_node_event_id },
+	{ 0, 0, NULL, NULL },
+};
+
+#define SPA_TYPE_INFO_NodeCommand			SPA_TYPE_INFO_COMMAND_BASE "Node"
+#define SPA_TYPE_INFO_NODE_COMMAND_BASE		SPA_TYPE_INFO_NodeCommand ":"
+
+static const struct spa_type_info spa_type_node_command_id[] = {
+	{ SPA_NODE_COMMAND_Suspend,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Suspend", NULL },
+	{ SPA_NODE_COMMAND_Pause,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Pause",   NULL },
+	{ SPA_NODE_COMMAND_Start,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Start",   NULL },
+	{ SPA_NODE_COMMAND_Enable,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Enable",  NULL },
+	{ SPA_NODE_COMMAND_Disable,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Disable", NULL },
+	{ SPA_NODE_COMMAND_Flush,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Flush",   NULL },
+	{ SPA_NODE_COMMAND_Drain,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Drain",   NULL },
+	{ SPA_NODE_COMMAND_Marker,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "Marker",  NULL },
+	{ SPA_NODE_COMMAND_ParamBegin,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "ParamBegin",  NULL },
+	{ SPA_NODE_COMMAND_ParamEnd,	SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "ParamEnd",  NULL },
+	{ SPA_NODE_COMMAND_RequestProcess, SPA_TYPE_COMMAND_Node, SPA_TYPE_INFO_NODE_COMMAND_BASE "RequestProcess",  NULL },
+	{ 0, 0, NULL, NULL },
+};
+
+static const struct spa_type_info spa_type_node_command[] = {
+	{ 0, SPA_TYPE_Id, SPA_TYPE_INFO_NODE_COMMAND_BASE, spa_type_node_command_id },
+	{ 0, 0, NULL, NULL },
+};
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_NODE_TYPES_H */
diff --git a/third_party/pipewire/spa/node/utils.h b/third_party/pipewire/spa/node/utils.h
new file mode 100644
index 0000000000..9503d8bbf4
--- /dev/null
+++ b/third_party/pipewire/spa/node/utils.h
@@ -0,0 +1,158 @@
+/* Simple Plugin API
+ *
+ * Copyright © 2019 Wim Taymans
+ *
+ * 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 SPA_NODE_UTILS_H
+#define SPA_NODE_UTILS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup spa_node
+ * \{
+ */
+
+#include <spa/pod/builder.h>
+
+#include <spa/node/node.h>
+
+struct spa_result_node_params_data {
+	struct spa_pod_builder *builder;
+	struct spa_result_node_params data;
+};
+
+static inline void spa_result_func_node_params(void *data,
+		int seq, int res, uint32_t type, const void *result)
+{
+	struct spa_result_node_params_data *d =
+		(struct spa_result_node_params_data *) data;
+	const struct spa_result_node_params *r =
+		(const struct spa_result_node_params *) result;
+	uint32_t offset = d->builder->state.offset;
+	if (spa_pod_builder_raw_padded(d->builder, r->param, SPA_POD_SIZE(r->param)) < 0)
+		return;
+	d->data.next = r->next;
+	d->data.param = spa_pod_builder_deref(d->builder, offset);
+}
+
+static inline int spa_node_enum_params_sync(struct spa_node *node,
+			uint32_t id, uint32_t *index,
+			const struct spa_pod *filter,
+			struct spa_pod **param,
+			struct spa_pod_builder *builder)
+{
+	struct spa_result_node_params_data data = { builder, };
+	struct spa_hook listener = {{0}};
+	static const struct spa_node_events node_events = {
+		.version = SPA_VERSION_NODE_EVENTS,
+		.info = NULL,
+		.port_info = NULL,
+		.result = spa_result_func_node_params,
+	};
+	int res;
+
+	res = spa_node_add_listener(node, &listener, &node_events, &data);
+	if (res >= 0) {
+		res = spa_node_enum_params(node, 0, id, *index, 1, filter);
+		spa_hook_remove(&listener);
+	}
+
+	if (data.data.param == NULL) {
+		if (res > 0)
+			res = 0;
+	} else {
+		*index = data.data.next;
+		*param = data.data.param;
+		res = 1;
+	}
+	return res;
+}
+
+static inline int spa_node_port_enum_params_sync(struct spa_node *node,
+			enum spa_direction direction, uint32_t port_id,
+			uint32_t id, uint32_t *index,
+			const struct spa_pod *filter,
+			struct spa_pod **param,
+			struct spa_pod_builder *builder)
+{
+	struct spa_result_node_params_data data = { builder, };
+	struct spa_hook listener = {{0}};
+	static const struct spa_node_events node_events = {
+		.version = SPA_VERSION_NODE_EVENTS,
+		.info = NULL,
+		.port_info = NULL,
+		.result = spa_result_func_node_params,
+	};
+	int res;
+
+	res = spa_node_add_listener(node, &listener, &node_events, &data);
+	if (res >= 0) {
+		res = spa_node_port_enum_params(node, 0, direction, port_id,
+				id, *index, 1, filter);
+		spa_hook_remove(&listener);
+	}
+
+	if (data.data.param == NULL) {
+		if (res > 0)
+			res = 0;
+	} else {
+		*index = data.data.next;
+		*param = data.data.param;
+		res = 1;
+	}
+	return res;
+}
+
+#define spa_node_emit(hooks,method,version,...)					\
+		spa_hook_list_call_simple(hooks, struct spa_node_events,	\
+				method, version, ##__VA_ARGS__)
+
+#define spa_node_emit_info(hooks,...)		spa_node_emit(hooks,info, 0, __VA_ARGS__)
+#define spa_node_emit_port_info(hooks,...)	spa_node_emit(hooks,port_info, 0, __VA_ARGS__)
+#define spa_node_emit_result(hooks,...)		spa_node_emit(hooks,result, 0, __VA_ARGS__)
+#define spa_node_emit_event(hooks,...)		spa_node_emit(hooks,event, 0, __VA_ARGS__)
+
+
+#define spa_node_call(callbacks,method,version,...)			\
+({									\
+	int _res = -ENOTSUP;							\
+	spa_callbacks_call_res(callbacks, struct spa_node_callbacks,	\
+			_res, method, version, ##__VA_ARGS__);		\
+	_res;								\
+})
+
+#define spa_node_call_ready(hook,...)		spa_node_call(hook, ready, 0, __VA_ARGS__)
+#define spa_node_call_reuse_buffer(hook,...)	spa_node_call(hook, reuse_buffer, 0, __VA_ARGS__)
+#define spa_node_call_xrun(hook,...)		spa_node_call(hook, xrun, 0, __VA_ARGS__)
+
+/**
+ * \}
+ */
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif /* SPA_NODE_UTILS_H */