Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1055 insertions, 0 deletions

diff --git a/spa/plugins/v4l2/v4l2-source.c b/spa/plugins/v4l2/v4l2-source.c
new file mode 100644
index 0000000..b6eae49
--- /dev/null
+++ b/spa/plugins/v4l2/v4l2-source.c
@@ -0,0 +1,1055 @@
+/* Spa V4l2 Source
+ *
+ * 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.
+ */
+
+#include <stddef.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <linux/videodev2.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log.h>
+#include <spa/support/loop.h>
+#include <spa/utils/list.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/monitor/device.h>
+#include <spa/node/node.h>
+#include <spa/node/io.h>
+#include <spa/node/utils.h>
+#include <spa/node/keys.h>
+#include <spa/param/video/format-utils.h>
+#include <spa/param/param.h>
+#include <spa/param/latency-utils.h>
+#include <spa/pod/filter.h>
+#include <spa/control/control.h>
+
+#include "v4l2.h"
+
+static const char default_device[] = "/dev/video0";
+
+struct props {
+	char device[64];
+	char device_name[128];
+	int device_fd;
+};
+
+static void reset_props(struct props *props)
+{
+	strncpy(props->device, default_device, 64);
+}
+
+#define MAX_BUFFERS     32
+
+#define BUFFER_FLAG_OUTSTANDING	(1<<0)
+#define BUFFER_FLAG_ALLOCATED	(1<<1)
+#define BUFFER_FLAG_MAPPED	(1<<2)
+
+struct buffer {
+	uint32_t id;
+	uint32_t flags;
+	struct spa_list link;
+	struct spa_buffer *outbuf;
+	struct spa_meta_header *h;
+	struct v4l2_buffer v4l2_buffer;
+	void *ptr;
+};
+
+#define MAX_CONTROLS	64
+
+struct control {
+	uint32_t id;
+	uint32_t ctrl_id;
+	double value;
+};
+
+struct port {
+	struct impl *impl;
+
+	bool alloc_buffers;
+	bool have_expbuf;
+
+	bool next_fmtdesc;
+	struct v4l2_fmtdesc fmtdesc;
+	bool next_frmsize;
+	struct v4l2_frmsizeenum frmsize;
+	struct v4l2_frmivalenum frmival;
+
+	bool have_format;
+	struct spa_video_info current_format;
+	struct spa_fraction rate;
+
+	struct spa_v4l2_device dev;
+
+	bool have_query_ext_ctrl;
+	struct v4l2_format fmt;
+	enum v4l2_buf_type type;
+	enum v4l2_memory memtype;
+
+	struct control controls[MAX_CONTROLS];
+	uint32_t n_controls;
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+	struct spa_list queue;
+
+	struct spa_source source;
+
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_io_buffers *io;
+	struct spa_io_sequence *control;
+#define PORT_PropInfo	0
+#define PORT_EnumFormat	1
+#define PORT_Meta	2
+#define PORT_IO		3
+#define PORT_Format	4
+#define PORT_Buffers	5
+#define PORT_Latency	6
+#define N_PORT_PARAMS	7
+	struct spa_param_info params[N_PORT_PARAMS];
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_loop *data_loop;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+#define NODE_PropInfo	0
+#define NODE_Props	1
+#define NODE_EnumFormat	2
+#define NODE_Format	3
+#define N_NODE_PARAMS	4
+	struct spa_param_info params[N_NODE_PARAMS];
+	struct props props;
+
+	struct spa_hook_list hooks;
+	struct spa_callbacks callbacks;
+
+	struct port out_ports[1];
+
+	struct spa_io_position *position;
+	struct spa_io_clock *clock;
+
+	struct spa_latency_info latency[2];
+};
+
+#define CHECK_PORT(this,direction,port_id)  ((direction) == SPA_DIRECTION_OUTPUT && (port_id) == 0)
+
+#define GET_OUT_PORT(this,p)         (&this->out_ports[p])
+#define GET_PORT(this,d,p)           GET_OUT_PORT(this,p)
+
+#include "v4l2-utils.c"
+
+static int port_get_format(struct port *port,
+			   uint32_t index,
+			   const struct spa_pod *filter,
+			   struct spa_pod **param,
+			   struct spa_pod_builder *builder)
+{
+	struct spa_pod_frame f;
+
+	if (!port->have_format)
+		return -EIO;
+	if (index > 0)
+		return 0;
+
+	spa_pod_builder_push_object(builder, &f, SPA_TYPE_OBJECT_Format, SPA_PARAM_Format);
+	spa_pod_builder_add(builder,
+		SPA_FORMAT_mediaType,    SPA_POD_Id(port->current_format.media_type),
+		SPA_FORMAT_mediaSubtype, SPA_POD_Id(port->current_format.media_subtype),
+		0);
+
+	switch (port->current_format.media_subtype) {
+	case SPA_MEDIA_SUBTYPE_raw:
+		spa_pod_builder_add(builder,
+			SPA_FORMAT_VIDEO_format,    SPA_POD_Id(port->current_format.info.raw.format),
+			SPA_FORMAT_VIDEO_size,      SPA_POD_Rectangle(&port->current_format.info.raw.size),
+			SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&port->current_format.info.raw.framerate),
+			0);
+		break;
+	case SPA_MEDIA_SUBTYPE_mjpg:
+	case SPA_MEDIA_SUBTYPE_jpeg:
+		spa_pod_builder_add(builder,
+			SPA_FORMAT_VIDEO_size,      SPA_POD_Rectangle(&port->current_format.info.mjpg.size),
+			SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&port->current_format.info.mjpg.framerate),
+			0);
+		break;
+	case SPA_MEDIA_SUBTYPE_h264:
+		spa_pod_builder_add(builder,
+			SPA_FORMAT_VIDEO_size,      SPA_POD_Rectangle(&port->current_format.info.h264.size),
+			SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&port->current_format.info.h264.framerate),
+			0);
+		break;
+	default:
+		return -EIO;
+	}
+
+	*param = spa_pod_builder_pop(builder, &f);
+
+	return 1;
+}
+
+
+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 impl *this = object;
+	struct spa_pod *param;
+	struct spa_pod_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(num != 0, -EINVAL);
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_PropInfo:
+	{
+		struct props *p = &this->props;
+
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_device),
+				SPA_PROP_INFO_description, SPA_POD_String("The V4L2 device"),
+				SPA_PROP_INFO_type, SPA_POD_String(p->device));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_deviceName),
+				SPA_PROP_INFO_description, SPA_POD_String("The V4L2 device name"),
+				SPA_PROP_INFO_type, SPA_POD_String(p->device_name));
+			break;
+		case 2:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_PropInfo, id,
+				SPA_PROP_INFO_id,   SPA_POD_Id(SPA_PROP_deviceFd),
+				SPA_PROP_INFO_description, SPA_POD_String("The V4L2 fd"),
+				SPA_PROP_INFO_type, SPA_POD_Int(p->device_fd));
+			break;
+		default:
+			return spa_v4l2_enum_controls(this, seq, result.index - 3, num, filter);
+		}
+		break;
+	}
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_Props, id,
+				SPA_PROP_device,     SPA_POD_String(p->device),
+				SPA_PROP_deviceName, SPA_POD_String(p->device_name),
+				SPA_PROP_deviceFd,   SPA_POD_Int(p->device_fd));
+			break;
+		default:
+			return 0;
+		}
+		break;
+	}
+	case SPA_PARAM_EnumFormat:
+		return spa_v4l2_enum_format(this, seq, start, num, filter);
+	case SPA_PARAM_Format:
+		if((res = port_get_format(GET_OUT_PORT(this, 0),
+						result.index, filter, &param, &b)) <= 0)
+			return res;
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int impl_node_set_param(void *object,
+			       uint32_t id, uint32_t flags,
+			       const struct spa_pod *param)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_PARAM_Props:
+	{
+		struct props *p = &this->props;
+		struct spa_pod_object *obj = (struct spa_pod_object *) param;
+		struct spa_pod_prop *prop;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+		SPA_POD_OBJECT_FOREACH(obj, prop) {
+			switch (prop->key) {
+			case SPA_PROP_device:
+				strncpy(p->device,
+						(char *)SPA_POD_CONTENTS(struct spa_pod_string, &prop->value),
+						sizeof(p->device)-1);
+				break;
+			default:
+				spa_v4l2_set_control(this, prop->key, prop);
+				break;
+			}
+		}
+
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+	struct impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	switch (id) {
+	case SPA_IO_Clock:
+		this->clock = data;
+		break;
+	case SPA_IO_Position:
+		this->position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	port = GET_OUT_PORT(this, 0);
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_ParamBegin:
+		if ((res = spa_v4l2_open(&port->dev, this->props.device)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_ParamEnd:
+		if (port->have_format)
+			return 0;
+		if ((res = spa_v4l2_close(&port->dev)) < 0)
+			return res;
+		break;
+	case SPA_NODE_COMMAND_Start:
+	{
+		if (!port->have_format) {
+			spa_log_error(this->log, "no format");
+			return -EIO;
+		}
+		if (port->n_buffers == 0) {
+			spa_log_error(this->log, "no buffers");
+			return -EIO;
+		}
+
+		if ((res = spa_v4l2_stream_on(this)) < 0)
+			return res;
+		break;
+	}
+	case SPA_NODE_COMMAND_Pause:
+	case SPA_NODE_COMMAND_Suspend:
+		if ((res = spa_v4l2_stream_off(this)) < 0)
+			return res;
+		break;
+	default:
+		return -ENOTSUP;
+	}
+
+	return 0;
+}
+
+static const struct spa_dict_item info_items[] = {
+	{ SPA_KEY_DEVICE_API, "v4l2" },
+	{ SPA_KEY_MEDIA_CLASS, "Video/Source" },
+	{ SPA_KEY_MEDIA_ROLE, "Camera" },
+	{ SPA_KEY_NODE_DRIVER, "true" },
+};
+
+static void emit_node_info(struct impl *this, bool full)
+{
+	uint64_t old = full ? this->info.change_mask : 0;
+	if (full)
+		this->info.change_mask = this->info_all;
+	if (this->info.change_mask) {
+		this->info.props = &SPA_DICT_INIT_ARRAY(info_items);
+		spa_node_emit_info(&this->hooks, &this->info);
+		this->info.change_mask = old;
+	}
+}
+
+static void emit_port_info(struct impl *this, struct port *port, bool full)
+{
+	uint64_t old = full ? port->info.change_mask : 0;
+	if (full)
+		port->info.change_mask = port->info_all;
+	if (port->info.change_mask) {
+		spa_node_emit_port_info(&this->hooks,
+				SPA_DIRECTION_OUTPUT, 0, &port->info);
+		port->info.change_mask = old;
+	}
+}
+
+static int
+impl_node_add_listener(void *object,
+		struct spa_hook *listener,
+		const struct spa_node_events *events,
+		void *data)
+{
+	struct impl *this = object;
+	struct spa_hook_list save;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
+
+	emit_node_info(this, true);
+	emit_port_info(this, GET_OUT_PORT(this, 0), true);
+
+	spa_hook_list_join(&this->hooks, &save);
+
+	return 0;
+}
+
+static int impl_node_set_callbacks(void *object,
+				   const struct spa_node_callbacks *callbacks,
+				   void *data)
+{
+	struct impl *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 impl *this = object;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	spa_node_emit_result(&this->hooks, seq, 0, 0, NULL);
+
+	return 0;
+}
+
+static int impl_node_add_port(void *object,
+			      enum spa_direction direction,
+			      uint32_t port_id, const struct spa_dict *props)
+{
+	return -ENOTSUP;
+}
+
+static int impl_node_remove_port(void *object,
+		                 enum spa_direction direction,
+				 uint32_t port_id)
+{
+	return -ENOTSUP;
+}
+
+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 impl *this = object;
+	struct port *port;
+	struct spa_pod *param;
+	struct spa_pod_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_result_node_params result;
+	uint32_t count = 0;
+	int res;
+
+	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);
+
+	result.id = id;
+	result.next = start;
+     next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_PropInfo:
+		return spa_v4l2_enum_controls(this, seq, start, num, filter);
+
+	case SPA_PARAM_EnumFormat:
+		return spa_v4l2_enum_format(this, seq, start, num, filter);
+
+	case SPA_PARAM_Format:
+		if((res = port_get_format(port, result.index, filter, &param, &b)) <= 0)
+			return res;
+		break;
+	case SPA_PARAM_Buffers:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(4, 1, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_Int(port->fmt.fmt.pix.sizeimage),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(port->fmt.fmt.pix.bytesperline));
+		break;
+
+	case SPA_PARAM_Meta:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamMeta, id,
+				SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
+				SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+	case SPA_PARAM_IO:
+		switch (result.index) {
+		case 0:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Buffers),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_buffers)));
+			break;
+		case 1:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Clock),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_clock)));
+			break;
+		case 2:
+			param = spa_pod_builder_add_object(&b,
+				SPA_TYPE_OBJECT_ParamIO, id,
+				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Control),
+				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_sequence)));
+			break;
+		default:
+			return 0;
+		}
+		break;
+	case SPA_PARAM_Latency:
+		switch (result.index) {
+		case 0: case 1:
+			param = spa_latency_build(&b, id, &this->latency[result.index]);
+			break;
+		default:
+			return 0;
+		}
+		break;
+	default:
+		return -ENOENT;
+	}
+
+	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+		goto next;
+
+	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+	if (++count != num)
+		goto next;
+
+	return 0;
+}
+
+static int port_set_format(struct impl *this, struct port *port,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	struct spa_video_info info;
+	int res;
+
+	if (port->have_format) {
+		spa_v4l2_stream_off(this);
+		spa_v4l2_clear_buffers(this);
+	}
+	if (format == NULL) {
+		if (!port->have_format)
+			return 0;
+
+		port->have_format = false;
+		port->dev.have_format = false;
+		spa_v4l2_close(&port->dev);
+		goto done;
+	} else {
+		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return res;
+
+		if (info.media_type != SPA_MEDIA_TYPE_video) {
+			spa_log_error(this->log, "media type must be video");
+			return -EINVAL;
+		}
+
+		switch (info.media_subtype) {
+		case SPA_MEDIA_SUBTYPE_raw:
+			if (spa_format_video_raw_parse(format, &info.info.raw) < 0) {
+				spa_log_error(this->log, "can't parse video raw");
+				return -EINVAL;
+			}
+			break;
+		case SPA_MEDIA_SUBTYPE_mjpg:
+			if (spa_format_video_mjpg_parse(format, &info.info.mjpg) < 0)
+				return -EINVAL;
+			break;
+		case SPA_MEDIA_SUBTYPE_h264:
+			if (spa_format_video_h264_parse(format, &info.info.h264) < 0)
+				return -EINVAL;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	if (port->have_format && !SPA_FLAG_IS_SET(flags, SPA_NODE_PARAM_FLAG_TEST_ONLY)) {
+		port->have_format = false;
+	}
+
+	if ((res = spa_v4l2_set_format(this, &info, flags)) < 0)
+		return res;
+
+	if (!SPA_FLAG_IS_SET(flags, SPA_NODE_PARAM_FLAG_TEST_ONLY)) {
+		port->current_format = info;
+		port->have_format = true;
+	}
+
+    done:
+	this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+		this->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+		this->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, 0);
+	}
+	emit_port_info(this, port, false);
+	emit_node_info(this, false);
+
+	return 0;
+}
+
+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)
+{
+	int res;
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(object != NULL, -EINVAL);
+
+	spa_return_val_if_fail(CHECK_PORT(object, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_PARAM_Latency:
+	{
+		struct spa_latency_info info;
+		if ((res = spa_latency_parse(param, &info)) < 0)
+			return res;
+		if (direction == info.direction)
+			return -EINVAL;
+
+		this->latency[info.direction] = info;
+		port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+		port->params[PORT_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
+		emit_port_info(this, port, false);
+		break;
+	}
+	case SPA_PARAM_Format:
+		res = port_set_format(object, port, flags, param);
+		break;
+	default:
+		res = -ENOENT;
+	}
+	return res;
+}
+
+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 impl *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	if (port->n_buffers) {
+		spa_v4l2_stream_off(this);
+		if ((res = spa_v4l2_clear_buffers(this)) < 0)
+			return res;
+	}
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+	if (buffers == NULL)
+		return 0;
+
+	if (flags & SPA_NODE_BUFFERS_FLAG_ALLOC) {
+		res = spa_v4l2_alloc_buffers(this, buffers, n_buffers);
+	} else {
+		res = spa_v4l2_use_buffers(this, buffers, n_buffers);
+	}
+	return res;
+}
+
+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 impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+	port = GET_PORT(this, direction, port_id);
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = data;
+		break;
+	case SPA_IO_Control:
+		port->control = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object,
+				       uint32_t port_id,
+				       uint32_t buffer_id)
+{
+	struct impl *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(port_id == 0, -EINVAL);
+
+	port = GET_OUT_PORT(this, port_id);
+
+	spa_return_val_if_fail(buffer_id < port->n_buffers, -EINVAL);
+
+	res = spa_v4l2_buffer_recycle(this, buffer_id);
+
+	return res;
+}
+
+static int process_control(struct impl *this, struct spa_pod_sequence *control)
+{
+	struct spa_pod_control *c;
+
+	SPA_POD_SEQUENCE_FOREACH(control, c) {
+		switch (c->type) {
+		case SPA_CONTROL_Properties:
+		{
+			struct spa_pod_prop *prop;
+			struct spa_pod_object *obj = (struct spa_pod_object *) &c->value;
+
+			SPA_POD_OBJECT_FOREACH(obj, prop) {
+				spa_v4l2_set_control(this, prop->key, prop);
+			}
+			break;
+		}
+		default:
+			break;
+		}
+	}
+	return 0;
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	int res;
+	struct spa_io_buffers *io;
+	struct port *port;
+	struct buffer *b;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	port = GET_OUT_PORT(this, 0);
+	if ((io = port->io) == NULL)
+		return -EIO;
+
+	if (port->control)
+		process_control(this, &port->control->sequence);
+
+	spa_log_trace(this->log, "%p; status %d", this, io->status);
+
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	if (io->buffer_id < port->n_buffers) {
+		if ((res = spa_v4l2_buffer_recycle(this, io->buffer_id)) < 0)
+			return res;
+
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	if (spa_list_is_empty(&port->queue))
+		return SPA_STATUS_OK;
+
+	b = spa_list_first(&port->queue, struct buffer, link);
+	spa_list_remove(&b->link);
+	SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUTSTANDING);
+
+	spa_log_trace(this->log, "%p: dequeue buffer %d", this, b->id);
+
+	io->buffer_id = b->id;
+	io->status = SPA_STATUS_HAVE_DATA;
+
+	return SPA_STATUS_HAVE_DATA;
+}
+
+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 impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+	spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+	this = (struct impl *) handle;
+
+	if (spa_streq(type, SPA_TYPE_INTERFACE_Node))
+		*interface = &this->node;
+	else
+		return -ENOENT;
+
+	return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+	return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+	      const struct spa_dict *params)
+{
+	return sizeof(struct impl);
+}
+
+static int
+impl_init(const struct spa_handle_factory *factory,
+	  struct spa_handle *handle,
+	  const struct spa_dict *info,
+	  const struct spa_support *support,
+	  uint32_t n_support)
+{
+	struct impl *this;
+	const char *str;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	handle->get_interface = impl_get_interface;
+	handle->clear = impl_clear;
+
+	this = (struct impl *) handle;
+
+	this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+	v4l2_log_topic_init(this->log);
+
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+	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->latency[SPA_DIRECTION_INPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_INPUT);
+	this->latency[SPA_DIRECTION_OUTPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
+
+	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+			SPA_NODE_CHANGE_MASK_PROPS |
+			SPA_NODE_CHANGE_MASK_PARAMS;
+	this->info = SPA_NODE_INFO_INIT();
+	this->info.max_output_ports = 1;
+	this->info.flags = SPA_NODE_FLAG_RT;
+	this->params[NODE_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[NODE_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->params[NODE_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	this->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, 0);
+	this->info.params = this->params;
+	this->info.n_params = N_NODE_PARAMS;
+	reset_props(&this->props);
+
+	port = GET_OUT_PORT(this, 0);
+	port->impl = this;
+	spa_list_init(&port->queue);
+	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.flags = SPA_PORT_FLAG_LIVE |
+			   SPA_PORT_FLAG_PHYSICAL |
+			   SPA_PORT_FLAG_TERMINAL;
+	port->params[PORT_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	port->params[PORT_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[PORT_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[PORT_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->params[PORT_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READ);
+	port->info.params = port->params;
+	port->info.n_params = N_PORT_PARAMS;
+
+	port->alloc_buffers = true;
+	port->have_expbuf = true;
+	port->have_query_ext_ctrl = true;
+	port->dev.log = this->log;
+	port->dev.fd = -1;
+
+	if (info && (str = spa_dict_lookup(info, SPA_KEY_API_V4L2_PATH))) {
+		strncpy(this->props.device, str, 63);
+		if ((res = spa_v4l2_open(&port->dev, this->props.device)) < 0)
+			return res;
+		spa_v4l2_close(&port->dev);
+	}
+
+	return 0;
+}
+
+static const struct spa_interface_info impl_interfaces[] = {
+	{SPA_TYPE_INTERFACE_Node,},
+};
+
+static int impl_enum_interface_info(const struct spa_handle_factory *factory,
+				    const struct spa_interface_info **info,
+				    uint32_t *index)
+{
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(info != NULL, -EINVAL);
+	spa_return_val_if_fail(index != NULL, -EINVAL);
+
+	if (*index >= SPA_N_ELEMENTS(impl_interfaces))
+		return 0;
+
+	*info = &impl_interfaces[(*index)++];
+
+	return 1;
+}
+
+const struct spa_handle_factory spa_v4l2_source_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_V4L2_SOURCE,
+	NULL,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};