pipewire/spa/plugins/libcamera/libcamera-source.cpp

/* Spa libcamera source */
/* SPDX-FileCopyrightText: Copyright © 2020 Collabora Ltd. */
/*                         @author Raghavendra Rao Sidlagatta <raghavendra.rao@collabora.com> */
/* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans <wim.taymans@gmail.com> */
/* SPDX-License-Identifier: MIT */

#include <climits>
#include <stddef.h>
#include <deque>
#include <optional>

#include <sys/mman.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/result.h>
#include <spa/utils/string.h>
#include <spa/utils/ringbuffer.h>
#include <spa/utils/dll.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/control/control.h>
#include <spa/pod/filter.h>

#include <libcamera/camera.h>
#include <libcamera/control_ids.h>
#include <libcamera/stream.h>
#include <libcamera/formats.h>
#include <libcamera/framebuffer.h>
#include <libcamera/framebuffer_allocator.h>

#include "libcamera.h"
#include "libcamera-manager.hpp"

using namespace libcamera;

namespace {

#define MAX_BUFFERS	32
#define MASK_BUFFERS	31

#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 spa_meta_videotransform *videotransform;
	void *ptr;
};

struct port {
	struct impl *impl;

	std::optional<spa_video_info> current_format;

	struct spa_fraction rate = {};
	StreamConfiguration streamConfig;

	spa_data_type memtype = SPA_DATA_Invalid;
	uint32_t buffers_blocks = 1;

	struct buffer buffers[MAX_BUFFERS];
	uint32_t n_buffers = 0;
	struct spa_list queue;
	struct spa_ringbuffer ring = SPA_RINGBUFFER_INIT();
	uint32_t ring_ids[MAX_BUFFERS];

	static constexpr uint64_t info_all = SPA_PORT_CHANGE_MASK_FLAGS |
		SPA_PORT_CHANGE_MASK_PROPS | SPA_PORT_CHANGE_MASK_PARAMS;
	struct spa_port_info info = SPA_PORT_INFO_INIT();
	struct spa_io_buffers *io = nullptr;
	struct spa_io_sequence *control = nullptr;
#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];

	uint32_t fmt_index = 0;
	PixelFormat enum_fmt;
	uint32_t size_index = 0;

	port(struct impl *impl)
		: impl(impl)
	{
		spa_list_init(&queue);

		params[PORT_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
		params[PORT_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
		params[PORT_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
		params[PORT_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
		params[PORT_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
		params[PORT_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
		params[PORT_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READ);

		info.flags = SPA_PORT_FLAG_LIVE | SPA_PORT_FLAG_PHYSICAL | SPA_PORT_FLAG_TERMINAL;
		info.params = params;
		info.n_params = N_PORT_PARAMS;
	}
};

struct impl {
	struct spa_handle handle;
	struct spa_node node = {};

	struct spa_log *log;
	struct spa_loop *data_loop;
	struct spa_system *system;

	static constexpr uint64_t info_all =
		SPA_NODE_CHANGE_MASK_FLAGS |
		SPA_NODE_CHANGE_MASK_PROPS |
		SPA_NODE_CHANGE_MASK_PARAMS;
	struct spa_node_info info = SPA_NODE_INFO_INIT();
#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];

	std::string device_id;
	std::string device_name;

	struct spa_hook_list hooks;
	struct spa_callbacks callbacks = {};

	std::array<port, 1> out_ports;

	struct spa_io_position *position = nullptr;
	struct spa_io_clock *clock = nullptr;

	struct spa_latency_info latency[2];

	std::shared_ptr<CameraManager> manager;
	std::shared_ptr<Camera> camera;

	FrameBufferAllocator *allocator = nullptr;
	std::vector<std::unique_ptr<libcamera::Request>> requestPool;
	std::deque<libcamera::Request *> pendingRequests;

	void requestComplete(libcamera::Request *request);

	std::unique_ptr<CameraConfiguration> config;

	struct spa_source source = {};

	ControlList ctrls;
	ControlList initial_controls;
	bool active = false;
	bool acquired = false;

	impl(spa_log *log, spa_loop *data_loop, spa_system *system,
	     std::shared_ptr<CameraManager> manager, std::shared_ptr<Camera> camera, std::string device_id);

	struct spa_dll dll;
};

}

#define CHECK_PORT(impl,direction,port_id)  ((direction) == SPA_DIRECTION_OUTPUT && (port_id) == 0)

#define GET_OUT_PORT(impl,p)         (&impl->out_ports[p])
#define GET_PORT(impl,d,p)           GET_OUT_PORT(impl,p)

static void setup_initial_controls(const ControlInfoMap& ctrl_infos, ControlList& ctrls)
{
	/* Libcamera recommends cameras default to manual focus mode, but we don't
	 * expose any focus controls.  So, specifically enable autofocus on
	 * cameras which support it. */
	auto af_it = ctrl_infos.find(libcamera::controls::AF_MODE);
	if (af_it != ctrl_infos.end()) {
		const ControlInfo &ctrl_info = af_it->second;
		auto is_af_continuous = [](const ControlValue &value) {
			return value.get<int32_t>() == libcamera::controls::AfModeContinuous;
		};
		if (std::any_of(ctrl_info.values().begin(),
		    ctrl_info.values().end(), is_af_continuous)) {
			ctrls.set(libcamera::controls::AF_MODE,
					libcamera::controls::AfModeContinuous);
		}
	}

	auto ae_it = ctrl_infos.find(libcamera::controls::AE_ENABLE);
	if (ae_it != ctrl_infos.end()) {
		ctrls.set(libcamera::controls::AE_ENABLE, true);
	}
}

int spa_libcamera_open(struct impl *impl)
{
	if (impl->acquired)
		return 0;

	spa_log_info(impl->log, "open camera %s", impl->device_id.c_str());

	if (int res = impl->camera->acquire(); res < 0)
		return res;

	impl->allocator = new FrameBufferAllocator(impl->camera);

	const ControlInfoMap &controls = impl->camera->controls();
	setup_initial_controls(controls, impl->initial_controls);

	impl->acquired = true;
	return 0;
}

int spa_libcamera_close(struct impl *impl)
{
	struct port *port = &impl->out_ports[0];
	if (!impl->acquired)
		return 0;
	if (impl->active || port->current_format)
		return 0;

	spa_log_info(impl->log, "close camera %s", impl->device_id.c_str());
	delete impl->allocator;
	impl->allocator = nullptr;

	impl->camera->release();

	impl->acquired = false;
	return 0;
}

static void spa_libcamera_get_config(struct impl *impl)
{
	if (impl->config)
		return;

	impl->config = impl->camera->generateConfiguration({ StreamRole::VideoRecording });
}

static int spa_libcamera_buffer_recycle(struct impl *impl, struct port *port, uint32_t buffer_id)
{
	struct buffer *b = &port->buffers[buffer_id];
	int res;

	if (!SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUTSTANDING))
		return 0;

	SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_OUTSTANDING);

	if (buffer_id >= impl->requestPool.size()) {
		spa_log_warn(impl->log, "invalid buffer_id %u >= %zu",
				buffer_id, impl->requestPool.size());
		return -EINVAL;
	}
	Request *request = impl->requestPool[buffer_id].get();
	Stream *stream = port->streamConfig.stream();
	FrameBuffer *buffer = impl->allocator->buffers(stream)[buffer_id].get();
	if ((res = request->addBuffer(stream, buffer)) < 0) {
		spa_log_warn(impl->log, "can't add buffer %u for request: %s",
				buffer_id, spa_strerror(res));
		return -ENOMEM;
	}
	if (!impl->active) {
		impl->pendingRequests.push_back(request);
		return 0;
	} else {
		request->controls().merge(impl->ctrls);
		impl->ctrls.clear();
		if ((res = impl->camera->queueRequest(request)) < 0) {
			spa_log_warn(impl->log, "can't queue buffer %u: %s",
				buffer_id, spa_strerror(res));
			return res == -EACCES ? -EBUSY : res;
		}
	}
	return 0;
}

static int allocBuffers(struct impl *impl, struct port *port, unsigned int count)
{
	int res;

	if ((res = impl->allocator->allocate(port->streamConfig.stream())) < 0)
		return res;

	for (unsigned int i = 0; i < count; i++) {
		std::unique_ptr<Request> request = impl->camera->createRequest(i);
		if (!request) {
			impl->requestPool.clear();
			return -ENOMEM;
		}
		impl->requestPool.push_back(std::move(request));
	}

	/* Some devices require data for each output video frame to be
	 * placed in discontiguous memory buffers. In such cases, one
	 * video frame has to be addressed using more than one memory.
	 * address. Therefore, need calculate the number of discontiguous
	 * memory and allocate the specified amount of memory */
	Stream *stream = impl->config->at(0).stream();
	const std::vector<std::unique_ptr<FrameBuffer>> &bufs =
			impl->allocator->buffers(stream);
	const std::vector<libcamera::FrameBuffer::Plane> &planes = bufs[0]->planes();
	int fd = -1;
	uint32_t buffers_blocks = 0;

	for (const FrameBuffer::Plane &plane : planes) {
		const int current_fd = plane.fd.get();
		if (current_fd >= 0 && current_fd != fd) {
			buffers_blocks += 1;
			fd = current_fd;
		}
	}

	if (buffers_blocks > 0) {
		port->buffers_blocks = buffers_blocks;
	}
	return res;
}

static void freeBuffers(struct impl *impl, struct port *port)
{
	impl->pendingRequests.clear();
	impl->requestPool.clear();
	impl->allocator->free(port->streamConfig.stream());
}

static int spa_libcamera_clear_buffers(struct impl *impl, struct port *port)
{
	uint32_t i;

	if (port->n_buffers == 0)
		return 0;

	for (i = 0; i < port->n_buffers; i++) {
		struct buffer *b;
		struct spa_data *d;

		b = &port->buffers[i];
		d = b->outbuf->datas;

		if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUTSTANDING)) {
			spa_log_debug(impl->log, "queueing outstanding buffer %p", b);
			spa_libcamera_buffer_recycle(impl, port, i);
		}
		if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_MAPPED)) {
			munmap(SPA_PTROFF(b->ptr, -d[0].mapoffset, void),
					d[0].maxsize - d[0].mapoffset);
		}
		if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_ALLOCATED)) {
			close(d[0].fd);
		}
		d[0].type = SPA_ID_INVALID;
	}

	freeBuffers(impl, port);
	port->n_buffers = 0;
	port->ring = SPA_RINGBUFFER_INIT();

	return 0;
}

struct format_info {
	PixelFormat pix;
	spa_video_format format;
	spa_media_type media_type;
	spa_media_subtype media_subtype;
};

#define MAKE_FMT(pix,fmt,mt,mst) { pix, SPA_VIDEO_FORMAT_ ##fmt, SPA_MEDIA_TYPE_ ##mt, SPA_MEDIA_SUBTYPE_ ##mst }
static const struct format_info format_info[] = {
	/* RGB formats */
	MAKE_FMT(formats::RGB565, RGB16, video, raw),
	MAKE_FMT(formats::RGB565_BE, RGB16, video, raw),
	MAKE_FMT(formats::RGB888, BGR, video, raw),
	MAKE_FMT(formats::BGR888, RGB, video, raw),
	MAKE_FMT(formats::XRGB8888, BGRx, video, raw),
	MAKE_FMT(formats::XBGR8888, RGBx, video, raw),
	MAKE_FMT(formats::RGBX8888, xBGR, video, raw),
	MAKE_FMT(formats::BGRX8888, xRGB, video, raw),
	MAKE_FMT(formats::ARGB8888, BGRA, video, raw),
	MAKE_FMT(formats::ABGR8888, RGBA, video, raw),
	MAKE_FMT(formats::RGBA8888, ABGR, video, raw),
	MAKE_FMT(formats::BGRA8888, ARGB, video, raw),

	MAKE_FMT(formats::YUYV, YUY2, video, raw),
	MAKE_FMT(formats::YVYU, YVYU, video, raw),
	MAKE_FMT(formats::UYVY, UYVY, video, raw),
	MAKE_FMT(formats::VYUY, VYUY, video, raw),

	MAKE_FMT(formats::NV12, NV12, video, raw),
	MAKE_FMT(formats::NV21, NV21, video, raw),
	MAKE_FMT(formats::NV16, NV16, video, raw),
	MAKE_FMT(formats::NV61, NV61, video, raw),
	MAKE_FMT(formats::NV24, NV24, video, raw),

	MAKE_FMT(formats::YUV420, I420, video, raw),
	MAKE_FMT(formats::YVU420, YV12, video, raw),
	MAKE_FMT(formats::YUV422, Y42B, video, raw),

	MAKE_FMT(formats::MJPEG, ENCODED, video, mjpg),
#undef MAKE_FMT
};

static const struct format_info *video_format_to_info(const PixelFormat &pix) {
	size_t i;

	for (i = 0; i < SPA_N_ELEMENTS(format_info); i++) {
		if (format_info[i].pix == pix)
			return &format_info[i];
	}
	return NULL;
}

static const struct format_info *find_format_info_by_media_type(uint32_t type,
		uint32_t subtype, uint32_t format, int startidx)
{
	size_t i;

	for (i = startidx; i < SPA_N_ELEMENTS(format_info); i++) {
		if ((format_info[i].media_type == type) &&
		    (format_info[i].media_subtype == subtype) &&
		    (format == SPA_VIDEO_FORMAT_UNKNOWN || format_info[i].format == format))
			return &format_info[i];
	}
	return NULL;
}

static int score_size(Size &a, Size &b)
{
	int x, y;
	x = (int)a.width - (int)b.width;
	y = (int)a.height - (int)b.height;
	return x * x + y * y;
}

static void
parse_colorimetry(const ColorSpace& colorspace,
		struct spa_video_colorimetry *colorimetry)
{
	switch (colorspace.range) {
	case ColorSpace::Range::Full:
		colorimetry->range = SPA_VIDEO_COLOR_RANGE_0_255;
		break;
	case ColorSpace::Range::Limited:
		colorimetry->range = SPA_VIDEO_COLOR_RANGE_16_235;
		break;
	}

	switch (colorspace.ycbcrEncoding) {
	case ColorSpace::YcbcrEncoding::None:
		colorimetry->matrix = SPA_VIDEO_COLOR_MATRIX_RGB;
		break;
	case ColorSpace::YcbcrEncoding::Rec601:
		colorimetry->matrix = SPA_VIDEO_COLOR_MATRIX_BT601;
		break;
	case ColorSpace::YcbcrEncoding::Rec709:
		colorimetry->matrix = SPA_VIDEO_COLOR_MATRIX_BT709;
		break;
	case ColorSpace::YcbcrEncoding::Rec2020:
		colorimetry->matrix = SPA_VIDEO_COLOR_MATRIX_BT2020;
		break;
	}

	switch (colorspace.transferFunction) {
	case ColorSpace::TransferFunction::Linear:
		colorimetry->transfer = SPA_VIDEO_TRANSFER_UNKNOWN;
		break;
	case ColorSpace::TransferFunction::Srgb:
		colorimetry->transfer = SPA_VIDEO_TRANSFER_SRGB;
		break;
	case ColorSpace::TransferFunction::Rec709:
		colorimetry->transfer = SPA_VIDEO_TRANSFER_BT709;
		break;
	}

	switch (colorspace.primaries) {
	case ColorSpace::Primaries::Raw:
		colorimetry->primaries = SPA_VIDEO_COLOR_PRIMARIES_UNKNOWN;
		break;
	case ColorSpace::Primaries::Smpte170m:
		colorimetry->primaries = SPA_VIDEO_COLOR_PRIMARIES_SMPTE170M;
		break;
	case ColorSpace::Primaries::Rec709:
		colorimetry->primaries = SPA_VIDEO_COLOR_PRIMARIES_BT709;
		break;
	case ColorSpace::Primaries::Rec2020:
		colorimetry->primaries = SPA_VIDEO_COLOR_PRIMARIES_BT2020;
		break;
	}
}

static int
spa_libcamera_enum_format(struct impl *impl, struct port *port, int seq,
		     uint32_t start, uint32_t num, const struct spa_pod *filter)
{
	int res;
	const struct format_info *info;
	uint8_t buffer[1024];
	struct spa_pod_builder b = { 0 };
	struct spa_pod_frame f[2];
	struct spa_result_node_params result;
	struct spa_video_colorimetry colorimetry = {};
	struct spa_pod *fmt;
	uint32_t i, count = 0, num_sizes;
	PixelFormat format;
	Size frameSize;
	SizeRange sizeRange = SizeRange();

	spa_libcamera_get_config(impl);

	const StreamConfiguration& streamConfig = impl->config->at(0);
	const StreamFormats &formats = streamConfig.formats();

	if (streamConfig.colorSpace)
		parse_colorimetry(*streamConfig.colorSpace, &colorimetry);

	result.id = SPA_PARAM_EnumFormat;
	result.next = start;

	if (result.next == 0) {
		port->fmt_index = 0;
		port->size_index = 0;
	}
next:
	result.index = result.next++;

next_fmt:
	if (port->fmt_index >= formats.pixelformats().size())
		goto enum_end;

	format = formats.pixelformats()[port->fmt_index];

	spa_log_debug(impl->log, "format: %s", format.toString().c_str());

	info = video_format_to_info(format);
	if (info == NULL) {
		spa_log_debug(impl->log, "unknown format");
		port->fmt_index++;
		goto next_fmt;
	}

	num_sizes = formats.sizes(format).size();
	if (num_sizes > 0 && port->size_index <= num_sizes) {
		if (port->size_index == 0) {
			Size wanted = Size(640, 480), test;
			int score, best = INT_MAX;
			for (i = 0; i < num_sizes; i++) {
				test = formats.sizes(format)[i];
				score = score_size(wanted, test);
				if (score < best) {
					best = score;
					frameSize = test;
				}
			}
		}
		else {
			frameSize = formats.sizes(format)[port->size_index - 1];
		}
	} else if (port->size_index < 1) {
		sizeRange = formats.range(format);
		if (sizeRange.hStep == 0 || sizeRange.vStep == 0) {
			port->size_index = 0;
			port->fmt_index++;
			goto next_fmt;
		}
	} else {
		port->size_index = 0;
		port->fmt_index++;
		goto next_fmt;
	}
	port->size_index++;

	spa_pod_builder_init(&b, buffer, sizeof(buffer));
	spa_pod_builder_push_object(&b, &f[0], SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat);
	spa_pod_builder_add(&b,
			SPA_FORMAT_mediaType,    SPA_POD_Id(info->media_type),
			SPA_FORMAT_mediaSubtype, SPA_POD_Id(info->media_subtype),
			0);

	if (info->media_subtype == SPA_MEDIA_SUBTYPE_raw) {
		spa_pod_builder_prop(&b, SPA_FORMAT_VIDEO_format, 0);
		spa_pod_builder_id(&b, info->format);
	}
	if (info->pix.modifier()) {
		spa_pod_builder_prop(&b, SPA_FORMAT_VIDEO_modifier, 0);
		spa_pod_builder_long(&b, info->pix.modifier());
	}
	spa_pod_builder_prop(&b, SPA_FORMAT_VIDEO_size, 0);

	if (sizeRange.hStep != 0 && sizeRange.vStep != 0) {
		spa_pod_builder_push_choice(&b, &f[1], SPA_CHOICE_Step, 0);
		spa_pod_builder_frame(&b, &f[1]);
		spa_pod_builder_rectangle(&b,
				sizeRange.min.width,
				sizeRange.min.height);
		spa_pod_builder_rectangle(&b,
				sizeRange.min.width,
				sizeRange.min.height);
		spa_pod_builder_rectangle(&b,
				sizeRange.max.width,
				sizeRange.max.height);
		spa_pod_builder_rectangle(&b,
				sizeRange.hStep,
				sizeRange.vStep);
		spa_pod_builder_pop(&b, &f[1]);

	} else {
		spa_pod_builder_rectangle(&b, frameSize.width, frameSize.height);
	}

	if (streamConfig.colorSpace) {
		spa_pod_builder_add(&b,
				SPA_FORMAT_VIDEO_colorRange,
				SPA_POD_Id(colorimetry.range),
				SPA_FORMAT_VIDEO_colorMatrix,
				SPA_POD_Id(colorimetry.matrix),
				SPA_FORMAT_VIDEO_transferFunction,
				SPA_POD_Id(colorimetry.transfer),
				SPA_FORMAT_VIDEO_colorPrimaries,
				SPA_POD_Id(colorimetry.primaries), 0);
	}

	fmt = (struct spa_pod*) spa_pod_builder_pop(&b, &f[0]);

	if (spa_pod_filter(&b, &result.param, fmt, filter) < 0)
		goto next;

	spa_node_emit_result(&impl->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);

	if (++count != num)
		goto next;

      enum_end:
	res = 0;
	return res;
}

static int spa_libcamera_set_format(struct impl *impl, struct port *port,
		struct spa_video_info *format, bool try_only)
{
	const struct format_info *info = NULL;
	uint32_t video_format;
	struct spa_rectangle *size = NULL;
	struct spa_fraction *framerate = NULL;
	CameraConfiguration::Status validation;
	int res;

	switch (format->media_subtype) {
	case SPA_MEDIA_SUBTYPE_raw:
		video_format = format->info.raw.format;
		size = &format->info.raw.size;
		framerate = &format->info.raw.framerate;
		break;
	case SPA_MEDIA_SUBTYPE_mjpg:
	case SPA_MEDIA_SUBTYPE_jpeg:
		video_format = SPA_VIDEO_FORMAT_ENCODED;
		size = &format->info.mjpg.size;
		framerate = &format->info.mjpg.framerate;
		break;
	case SPA_MEDIA_SUBTYPE_h264:
		video_format = SPA_VIDEO_FORMAT_ENCODED;
		size = &format->info.h264.size;
		framerate = &format->info.h264.framerate;
		break;
	default:
		video_format = SPA_VIDEO_FORMAT_ENCODED;
		break;
	}

	info = find_format_info_by_media_type(format->media_type,
					      format->media_subtype, video_format, 0);
	if (info == NULL || size == NULL || framerate == NULL) {
		spa_log_error(impl->log, "unknown media type %d %d %d", format->media_type,
			      format->media_subtype, video_format);
		return -EINVAL;
	}
	StreamConfiguration& streamConfig = impl->config->at(0);

	streamConfig.pixelFormat = info->pix;
	streamConfig.size.width = size->width;
	streamConfig.size.height = size->height;
	streamConfig.bufferCount = 8;

	validation = impl->config->validate();
	if (validation == CameraConfiguration::Invalid)
		return -EINVAL;

	if (try_only)
		return 0;

	if ((res = spa_libcamera_open(impl)) < 0)
		return res;

	res = impl->camera->configure(impl->config.get());
	if (res != 0)
		goto error;

	port->streamConfig = impl->config->at(0);

	if ((res = allocBuffers(impl, port, port->streamConfig.bufferCount)) < 0)
		goto error;

	port->info.change_mask |= SPA_PORT_CHANGE_MASK_FLAGS | SPA_PORT_CHANGE_MASK_RATE;
	port->info.flags = SPA_PORT_FLAG_CAN_ALLOC_BUFFERS |
		SPA_PORT_FLAG_LIVE |
		SPA_PORT_FLAG_PHYSICAL |
		SPA_PORT_FLAG_TERMINAL;
	port->info.rate = SPA_FRACTION(port->rate.num, port->rate.denom);

	return 0;
error:
	spa_libcamera_close(impl);
	return res;

}

static struct {
	uint32_t id;
	uint32_t spa_id;
} control_map[] = {
	{ libcamera::controls::BRIGHTNESS, SPA_PROP_brightness },
	{ libcamera::controls::CONTRAST, SPA_PROP_contrast },
	{ libcamera::controls::SATURATION, SPA_PROP_saturation },
	{ libcamera::controls::EXPOSURE_TIME, SPA_PROP_exposure },
	{ libcamera::controls::ANALOGUE_GAIN, SPA_PROP_gain },
	{ libcamera::controls::SHARPNESS, SPA_PROP_sharpness },
};

static uint32_t control_to_prop_id(struct impl *impl, uint32_t control_id)
{
	SPA_FOR_EACH_ELEMENT_VAR(control_map, c) {
		if (c->id == control_id)
			return c->spa_id;
	}
	return SPA_PROP_START_CUSTOM + control_id;
}

static uint32_t prop_id_to_control(struct impl *impl, uint32_t prop_id)
{
	SPA_FOR_EACH_ELEMENT_VAR(control_map, c) {
		if (c->spa_id == prop_id)
			return c->id;
	}
	if (prop_id >= SPA_PROP_START_CUSTOM)
		return prop_id - SPA_PROP_START_CUSTOM;
	return SPA_ID_INVALID;
}

static int
spa_libcamera_enum_controls(struct impl *impl, struct port *port, int seq,
		       uint32_t start, uint32_t offset, uint32_t num,
		       const struct spa_pod *filter)
{
	const ControlInfoMap &info = impl->camera->controls();
	uint8_t buffer[1024];
	struct spa_pod_builder b = { 0 };
	struct spa_pod_frame f[2];
	struct spa_result_node_params result;
	struct spa_pod *ctrl;
	uint32_t count = 0, skip, id;
	int res;
	const ControlId *ctrl_id;
	ControlInfo ctrl_info;

	result.id = SPA_PARAM_PropInfo;
	result.next = start;

	auto it = info.begin();
	for (skip = result.next - offset; skip; skip--)
		it++;

	if (false) {
next:
		it++;
	}
	result.index = result.next++;
	if (it == info.end())
		goto enum_end;

	ctrl_id = it->first;
	ctrl_info = it->second;

	id = control_to_prop_id(impl, ctrl_id->id());

	spa_pod_builder_init(&b, buffer, sizeof(buffer));
	spa_pod_builder_push_object(&b, &f[0], SPA_TYPE_OBJECT_PropInfo, SPA_PARAM_PropInfo);
	spa_pod_builder_add(&b,
			SPA_PROP_INFO_id,   SPA_POD_Id(id),
			SPA_PROP_INFO_description, SPA_POD_String(ctrl_id->name().c_str()),
			0);

	switch (ctrl_id->type()) {
	case ControlTypeBool: {
		bool def;
		if (ctrl_info.def().isNone())
			def = ctrl_info.min().get<bool>();
		else
			def = ctrl_info.def().get<bool>();

		spa_pod_builder_add(&b,
					SPA_PROP_INFO_type, SPA_POD_CHOICE_Bool(
							def),
					0);
	} break;
	case ControlTypeFloat: {
		float min = ctrl_info.min().get<float>();
		float max = ctrl_info.max().get<float>();
		float def;

		if (ctrl_info.def().isNone())
			def = (min + max) / 2;
		else
			def = ctrl_info.def().get<float>();

		spa_pod_builder_add(&b,
				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Float(
						def, min, max),
				0);
	} break;
	case ControlTypeInteger32: {
		int32_t min = ctrl_info.min().get<int32_t>();
		int32_t max = ctrl_info.max().get<int32_t>();
		int32_t def;

		if (ctrl_info.def().isNone())
			def = (min + max) / 2;
		else
			def = ctrl_info.def().get<int32_t>();

		spa_pod_builder_add(&b,
				SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Int(
						def, min, max),
				0);
	} break;
	default:
		goto next;
	}

	ctrl = (struct spa_pod*) spa_pod_builder_pop(&b, &f[0]);

	if (spa_pod_filter(&b, &result.param, ctrl, filter) < 0)
		goto next;

	spa_node_emit_result(&impl->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);

	if (++count != num)
		goto next;

enum_end:
	res = 0;
	return res;
}

struct val {
	uint32_t type;
	float f_val;
	int32_t i_val;
	bool b_val;
	uint32_t id;
};

static int do_update_ctrls(struct spa_loop *loop,
			    bool async,
			    uint32_t seq,
			    const void *data,
			    size_t size,
			    void *user_data)
{
	struct impl *impl = (struct impl *)user_data;
	const struct val *d = (const struct val *)data;
	switch (d->type) {
	case ControlTypeBool:
		impl->ctrls.set(d->id, d->b_val);
		break;
	case ControlTypeFloat:
		impl->ctrls.set(d->id, d->f_val);
		break;
	case ControlTypeInteger32:
		impl->ctrls.set(d->id, (int32_t)d->i_val);
		break;
	default:
		break;
	}
	return 0;
}

static int
spa_libcamera_set_control(struct impl *impl, const struct spa_pod_prop *prop)
{
	const ControlInfoMap &info = impl->camera->controls();
	const ControlId *ctrl_id;
	int res;
	struct val d;
	uint32_t control_id;

	control_id = prop_id_to_control(impl, prop->key);
	if (control_id == SPA_ID_INVALID)
		return -ENOENT;

	auto v = info.idmap().find(control_id);
	if (v == info.idmap().end())
		return -ENOENT;

	ctrl_id = v->second;

	d.type = ctrl_id->type();
	d.id = ctrl_id->id();

	switch (d.type) {
	case ControlTypeBool:
		if ((res = spa_pod_get_bool(&prop->value, &d.b_val)) < 0)
			goto done;
		break;
	case ControlTypeFloat:
		if ((res = spa_pod_get_float(&prop->value, &d.f_val)) < 0)
			goto done;
		break;
	case ControlTypeInteger32:
		if ((res = spa_pod_get_int(&prop->value, &d.i_val)) < 0)
			goto done;
		break;
	default:
		res = -EINVAL;
		goto done;
	}
	spa_loop_invoke(impl->data_loop, do_update_ctrls, 0, &d, sizeof(d), true, impl);
	res = 0;
done:
	return res;
}


static void libcamera_on_fd_events(struct spa_source *source)
{
	struct impl *impl = (struct impl*) source->data;
	struct spa_io_buffers *io;
	struct port *port = &impl->out_ports[0];
	uint32_t index, buffer_id;
	struct buffer *b;
	uint64_t cnt;

	if (source->rmask & SPA_IO_ERR) {
		spa_log_error(impl->log, "libcamera %p: error %08x", impl, source->rmask);
		if (impl->source.loop)
			spa_loop_remove_source(impl->data_loop, &impl->source);
		return;
	}

	if (!(source->rmask & SPA_IO_IN)) {
		spa_log_warn(impl->log, "libcamera %p: spurious wakeup %d", impl, source->rmask);
		return;
	}

	if (spa_system_eventfd_read(impl->system, impl->source.fd, &cnt) < 0) {
		spa_log_error(impl->log, "Failed to read on event fd");
		return;
	}

	if (spa_ringbuffer_get_read_index(&port->ring, &index) < 1) {
		spa_log_error(impl->log, "nothing is queued");
		return;
	}
	buffer_id = port->ring_ids[index & MASK_BUFFERS];
	spa_ringbuffer_read_update(&port->ring, index + 1);

	b = &port->buffers[buffer_id];
	spa_list_append(&port->queue, &b->link);

	io = port->io;
	if (io == NULL) {
		b = spa_list_first(&port->queue, struct buffer, link);
		spa_list_remove(&b->link);
		SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUTSTANDING);
		spa_libcamera_buffer_recycle(impl, port, b->id);
	} else if (io->status != SPA_STATUS_HAVE_DATA) {
		if (io->buffer_id < port->n_buffers)
			spa_libcamera_buffer_recycle(impl, port, io->buffer_id);

		b = spa_list_first(&port->queue, struct buffer, link);
		spa_list_remove(&b->link);
		SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUTSTANDING);

		io->buffer_id = b->id;
		io->status = SPA_STATUS_HAVE_DATA;
		spa_log_trace(impl->log, "libcamera %p: now queued %d", impl, b->id);
	}
	spa_node_call_ready(&impl->callbacks, SPA_STATUS_HAVE_DATA);
}

static int spa_libcamera_use_buffers(struct impl *impl, struct port *port,
		struct spa_buffer **buffers, uint32_t n_buffers)
{
	return -ENOTSUP;
}

static const struct {
	Orientation libcamera_orientation; /* clockwise rotation then horizontal mirroring */
	uint32_t spa_transform_value; /* horizontal mirroring then counter-clockwise rotation */
} orientation_map[] = {
	{ Orientation::Rotate0, SPA_META_TRANSFORMATION_None },
	{ Orientation::Rotate0Mirror, SPA_META_TRANSFORMATION_Flipped },
	{ Orientation::Rotate90, SPA_META_TRANSFORMATION_270 },
	{ Orientation::Rotate90Mirror, SPA_META_TRANSFORMATION_Flipped90 },
	{ Orientation::Rotate180, SPA_META_TRANSFORMATION_180 },
	{ Orientation::Rotate180Mirror, SPA_META_TRANSFORMATION_Flipped180 },
	{ Orientation::Rotate270, SPA_META_TRANSFORMATION_90 },
	{ Orientation::Rotate270Mirror, SPA_META_TRANSFORMATION_Flipped270 },
};

static uint32_t libcamera_orientation_to_spa_transform_value(Orientation orientation)
{
	for (const auto& t : orientation_map) {
		if (t.libcamera_orientation == orientation)
			return t.spa_transform_value;
	}
	return SPA_META_TRANSFORMATION_None;
}

static int
mmap_init(struct impl *impl, struct port *port,
		struct spa_buffer **buffers, uint32_t n_buffers)
{
	unsigned int i, j;
	struct spa_data *d;
	Stream *stream = impl->config->at(0).stream();
	const std::vector<std::unique_ptr<FrameBuffer>> &bufs =
			impl->allocator->buffers(stream);

	if (n_buffers > 0) {
		if (bufs.size() != n_buffers)
			return -EINVAL;

		d = buffers[0]->datas;

		if (d[0].type != SPA_ID_INVALID &&
		    d[0].type & (1u << SPA_DATA_DmaBuf)) {
			port->memtype = SPA_DATA_DmaBuf;
		} else if (d[0].type != SPA_ID_INVALID &&
		    d[0].type & (1u << SPA_DATA_MemFd)) {
			port->memtype = SPA_DATA_MemFd;
		} else if (d[0].type & (1u << SPA_DATA_MemPtr)) {
			port->memtype = SPA_DATA_MemPtr;
		} else {
			spa_log_error(impl->log, "can't use buffers of type %d", d[0].type);
			return -EINVAL;
		}
	}

	for (i = 0; i < n_buffers; i++) {
		struct buffer *b;

		if (buffers[i]->n_datas < 1) {
			spa_log_error(impl->log, "invalid buffer data");
			return -EINVAL;
		}

		b = &port->buffers[i];
		b->id = i;
		b->outbuf = buffers[i];
		b->flags = BUFFER_FLAG_OUTSTANDING;
		b->h = (struct spa_meta_header*)spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));

		b->videotransform = (struct spa_meta_videotransform*)spa_buffer_find_meta_data(
			buffers[i], SPA_META_VideoTransform, sizeof(*b->videotransform));
		if (b->videotransform) {
			b->videotransform->transform =
				libcamera_orientation_to_spa_transform_value(impl->config->orientation);
			spa_log_debug(impl->log, "Setting videotransform for buffer %u to %u",
				i, b->videotransform->transform);

		}

		d = buffers[i]->datas;
		for(j = 0; j < buffers[i]->n_datas; ++j) {
			d[j].type = port->memtype;
			d[j].flags = SPA_DATA_FLAG_READABLE;
			d[j].mapoffset = 0;
			d[j].chunk->stride = port->streamConfig.stride;
			d[j].chunk->flags = 0;
			/* Update parameters according to the plane information */
			unsigned int numPlanes = bufs[i]->planes().size();
			if (buffers[i]->n_datas < numPlanes) {
				if (j < buffers[i]->n_datas - 1) {
					d[j].maxsize = bufs[i]->planes()[j].length;
					d[j].chunk->offset = bufs[i]->planes()[j].offset;
					d[j].chunk->size = bufs[i]->planes()[j].length;
				} else {
					d[j].chunk->offset = bufs[i]->planes()[j].offset;
					for (uint8_t k = j; k < numPlanes; k++) {
						d[j].maxsize += bufs[i]->planes()[k].length;
						d[j].chunk->size += bufs[i]->planes()[k].length;
					}
				}
			} else if (buffers[i]->n_datas == numPlanes) {
				d[j].maxsize = bufs[i]->planes()[j].length;
				d[j].chunk->offset = bufs[i]->planes()[j].offset;
				d[j].chunk->size = bufs[i]->planes()[j].length;
			} else {
				spa_log_warn(impl->log, "buffer index: i: %d, data member "
					"numbers: %d is greater than plane number: %d",
					i, buffers[i]->n_datas, numPlanes);
				d[j].maxsize = port->streamConfig.frameSize;
				d[j].chunk->offset = 0;
				d[j].chunk->size = port->streamConfig.frameSize;
			}

			if (port->memtype == SPA_DATA_DmaBuf ||
			    port->memtype == SPA_DATA_MemFd) {
				d[j].flags |= SPA_DATA_FLAG_MAPPABLE;
				d[j].fd = bufs[i]->planes()[j].fd.get();
				spa_log_debug(impl->log, "Got fd = %" PRId64 " for buffer: #%d", d[j].fd, i);
				d[j].data = NULL;
				SPA_FLAG_SET(b->flags, BUFFER_FLAG_ALLOCATED);
			}
			else if(port->memtype == SPA_DATA_MemPtr) {
				d[j].fd = -1;
				d[j].data = mmap(NULL,
						d[j].maxsize + d[j].mapoffset,
						PROT_READ, MAP_SHARED,
						bufs[i]->planes()[j].fd.get(),
						0);
				if (d[j].data == MAP_FAILED) {
					spa_log_error(impl->log, "mmap: %m");
					continue;
				}
				b->ptr = d[j].data;
				SPA_FLAG_SET(b->flags, BUFFER_FLAG_MAPPED);
				spa_log_debug(impl->log, "mmap ptr:%p", d[j].data);
			} else {
				spa_log_error(impl->log, "invalid buffer type");
				return -EIO;
			}
		}
		spa_libcamera_buffer_recycle(impl, port, i);
	}
	port->n_buffers = n_buffers;
	spa_log_debug(impl->log, "we have %d buffers", n_buffers);

	return 0;
}

static int
spa_libcamera_alloc_buffers(struct impl *impl, struct port *port,
		       struct spa_buffer **buffers,
		       uint32_t n_buffers)
{
	int res;

	if (port->n_buffers > 0)
		return -EIO;

	if ((res = mmap_init(impl, port, buffers, n_buffers)) < 0)
		return res;

	return 0;
}


void impl::requestComplete(libcamera::Request *request)
{
	struct impl *impl = this;
	struct port *port = &impl->out_ports[0];
	Stream *stream = port->streamConfig.stream();
	uint32_t index, buffer_id;
	struct buffer *b;

	spa_log_debug(impl->log, "request complete");

	buffer_id = request->cookie();
	b = &port->buffers[buffer_id];

	if ((request->status() == Request::RequestCancelled)) {
		spa_log_debug(impl->log, "Request was cancelled");
		request->reuse();
		SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUTSTANDING);
		spa_libcamera_buffer_recycle(impl, port, b->id);
		return;
	}
	FrameBuffer *buffer = request->findBuffer(stream);
	if (buffer == nullptr) {
		spa_log_warn(impl->log, "unknown buffer");
		return;
	}
	const FrameMetadata &fmd = buffer->metadata();

	if (impl->clock) {
		double target = (double)port->info.rate.num / port->info.rate.denom;
		double corr;

		if (impl->dll.bw == 0.0) {
			spa_dll_set_bw(&impl->dll, SPA_DLL_BW_MAX, port->info.rate.denom, port->info.rate.denom);
			impl->clock->next_nsec = fmd.timestamp;
			corr = 1.0;
		} else {
			double diff = ((double)impl->clock->next_nsec - (double)fmd.timestamp) / SPA_NSEC_PER_SEC;
			double error = port->info.rate.denom * (diff - target);
			corr = spa_dll_update(&impl->dll, SPA_CLAMPD(error, -128., 128.));
		}
		/* FIXME, we should follow the driver clock and target_ values.
		 * for now we ignore and use our own. */
		impl->clock->target_rate = port->rate;
		impl->clock->target_duration = 1;

		impl->clock->nsec = fmd.timestamp;
		impl->clock->rate = port->rate;
		impl->clock->position = fmd.sequence;
		impl->clock->duration = 1;
		impl->clock->delay = 0;
		impl->clock->rate_diff = corr;
		impl->clock->next_nsec += (uint64_t) (target * SPA_NSEC_PER_SEC * corr);
	}
	if (b->h) {
		b->h->flags = 0;
		b->h->offset = 0;
		b->h->seq = fmd.sequence;
		b->h->pts = fmd.timestamp;
		b->h->dts_offset = 0;
	}
	request->reuse();

	spa_ringbuffer_get_write_index(&port->ring, &index);
	port->ring_ids[index & MASK_BUFFERS] = buffer_id;
	spa_ringbuffer_write_update(&port->ring, index + 1);

	if (spa_system_eventfd_write(impl->system, impl->source.fd, 1) < 0)
		spa_log_error(impl->log, "Failed to write on event fd");

}

static int spa_libcamera_stream_on(struct impl *impl)
{
	struct port *port = &impl->out_ports[0];
	int res;

	if (!port->current_format) {
		spa_log_error(impl->log, "Exiting %s with -EIO", __FUNCTION__);
		return -EIO;
	}

	if (impl->active)
		return 0;

	impl->camera->requestCompleted.connect(impl, &impl::requestComplete);

	spa_log_info(impl->log, "starting camera %s", impl->device_id.c_str());
	if ((res = impl->camera->start(&impl->initial_controls)) < 0)
		goto error;

	for (Request *req : impl->pendingRequests) {
		if ((res = impl->camera->queueRequest(req)) < 0)
			goto error_stop;
	}
	impl->pendingRequests.clear();

	impl->dll.bw = 0.0;

	impl->source.func = libcamera_on_fd_events;
	impl->source.data = impl;
	impl->source.fd = spa_system_eventfd_create(impl->system, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
	impl->source.mask = SPA_IO_IN | SPA_IO_ERR;
	impl->source.rmask = 0;
	if (impl->source.fd < 0) {
		spa_log_error(impl->log, "Failed to create eventfd: %s", spa_strerror(impl->source.fd));
		res = impl->source.fd;
		goto error_stop;
	}
	spa_loop_add_source(impl->data_loop, &impl->source);

	impl->active = true;

	return 0;

error_stop:
	impl->camera->stop();
error:
	impl->camera->requestCompleted.disconnect(impl, &impl::requestComplete);
	return res == -EACCES ? -EBUSY : res;
}

static int do_remove_source(struct spa_loop *loop,
			    bool async,
			    uint32_t seq,
			    const void *data,
			    size_t size,
			    void *user_data)
{
	struct impl *impl = (struct impl *)user_data;
	if (impl->source.loop)
		spa_loop_remove_source(loop, &impl->source);
	return 0;
}

static int spa_libcamera_stream_off(struct impl *impl)
{
	struct port *port = &impl->out_ports[0];
	int res;

	if (!impl->active) {
		for (std::unique_ptr<Request> &req : impl->requestPool)
			req->reuse();
		return 0;
	}

	impl->active = false;
	spa_log_info(impl->log, "stopping camera %s", impl->device_id.c_str());
	impl->pendingRequests.clear();

	if ((res = impl->camera->stop()) < 0) {
		spa_log_warn(impl->log, "error stopping camera %s: %s",
				impl->device_id.c_str(), spa_strerror(res));
	}

	impl->camera->requestCompleted.disconnect(impl, &impl::requestComplete);

	spa_loop_invoke(impl->data_loop, do_remove_source, 0, NULL, 0, true, impl);
	if (impl->source.fd >= 0)  {
		spa_system_close(impl->system, impl->source.fd);
		impl->source.fd = -1;
	}

	spa_list_init(&port->queue);

	return 0;
}

static int port_get_format(struct impl *impl, 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->current_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 = (struct spa_pod*)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 *impl = (struct impl*)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(impl != 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:
	{
		switch (result.index) {
		case 0:
			param = (struct spa_pod*)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 libcamera device"),
				SPA_PROP_INFO_type, SPA_POD_String(impl->device_id.c_str()));
			break;
		case 1:
			param = (struct spa_pod*)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 libcamera device name"),
				SPA_PROP_INFO_type, SPA_POD_String(impl->device_name.c_str()));
			break;
		default:
			return spa_libcamera_enum_controls(impl,
					GET_OUT_PORT(impl, 0),
					seq, result.index, 2, num, filter);
		}
		break;
	}
	case SPA_PARAM_Props:
	{
		switch (result.index) {
		case 0:
			param = (struct spa_pod*)spa_pod_builder_add_object(&b,
				SPA_TYPE_OBJECT_Props, id,
				SPA_PROP_device,     SPA_POD_String(impl->device_id.c_str()),
				SPA_PROP_deviceName, SPA_POD_String(impl->device_name.c_str()));
			break;
		default:
			return 0;
		}
		break;
	}
	case SPA_PARAM_EnumFormat:
		return spa_libcamera_enum_format(impl, GET_OUT_PORT(impl, 0),
				seq, start, num, filter);
	case SPA_PARAM_Format:
		if ((res = port_get_format(impl, GET_OUT_PORT(impl, 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(&impl->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 *impl = (struct impl*)object;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	switch (id) {
	case SPA_PARAM_Props:
	{
		struct spa_pod_object *obj = (struct spa_pod_object *) param;
		struct spa_pod_prop *prop;

		if (param == NULL) {
			impl->device_id.clear();
			impl->device_name.clear();
			return 0;
		}
		SPA_POD_OBJECT_FOREACH(obj, prop) {
			char device[128];

			switch (prop->key) {
			case SPA_PROP_device:
				strncpy(device, (char *)SPA_POD_CONTENTS(struct spa_pod_string, &prop->value),
						sizeof(device)-1);
				impl->device_id = device;
				break;
			default:
				spa_libcamera_set_control(impl, 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 *impl = (struct impl*)object;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	switch (id) {
	case SPA_IO_Clock:
		impl->clock = (struct spa_io_clock*)data;
		if (impl->clock)
			SPA_FLAG_SET(impl->clock->flags, SPA_IO_CLOCK_FLAG_NO_RATE);
		break;
	case SPA_IO_Position:
		impl->position = (struct spa_io_position*)data;
		break;
	default:
		return -ENOENT;
	}
	return 0;
}

static int impl_node_send_command(void *object, const struct spa_command *command)
{
	struct impl *impl = (struct impl*)object;
	int res;

	spa_return_val_if_fail(impl != NULL, -EINVAL);
	spa_return_val_if_fail(command != NULL, -EINVAL);

	switch (SPA_NODE_COMMAND_ID(command)) {
	case SPA_NODE_COMMAND_Start:
	{
		struct port *port = GET_OUT_PORT(impl, 0);

		if (!port->current_format)
			return -EIO;
		if (port->n_buffers == 0)
			return -EIO;

		if ((res = spa_libcamera_stream_on(impl)) < 0)
			return res;
		break;
	}
	case SPA_NODE_COMMAND_Pause:
	case SPA_NODE_COMMAND_Suspend:
		if ((res = spa_libcamera_stream_off(impl)) < 0)
			return res;
		break;
	default:
		return -ENOTSUP;
	}

	return 0;
}

static void emit_node_info(struct impl *impl, bool full)
{
	static const struct spa_dict_item info_items[] = {
		{ SPA_KEY_DEVICE_API, "libcamera" },
		{ SPA_KEY_MEDIA_CLASS, "Video/Source" },
		{ SPA_KEY_MEDIA_ROLE, "Camera" },
		{ SPA_KEY_NODE_DRIVER, "true" },
	};
	uint64_t old = full ? impl->info.change_mask : 0;
	if (full)
		impl->info.change_mask = impl->info_all;
	if (impl->info.change_mask) {
		struct spa_dict dict = SPA_DICT_INIT_ARRAY(info_items);
		impl->info.props = &dict;
		spa_node_emit_info(&impl->hooks, &impl->info);
		impl->info.change_mask = old;
	}
}

static void emit_port_info(struct impl *impl, struct port *port, bool full)
{
	static const struct spa_dict_item info_items[] = {
		{ SPA_KEY_PORT_GROUP, "stream.0" },
	};
	uint64_t old = full ? port->info.change_mask : 0;
	if (full)
		port->info.change_mask = port->info_all;
	if (port->info.change_mask) {
		struct spa_dict dict = SPA_DICT_INIT_ARRAY(info_items);
		port->info.props = &dict;
		spa_node_emit_port_info(&impl->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 *impl = (struct impl*)object;
	struct spa_hook_list save;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	spa_hook_list_isolate(&impl->hooks, &save, listener, events, data);

	emit_node_info(impl, true);
	emit_port_info(impl, GET_OUT_PORT(impl, 0), true);

	spa_hook_list_join(&impl->hooks, &save);

	return 0;
}

static int impl_node_set_callbacks(void *object,
				   const struct spa_node_callbacks *callbacks,
				   void *data)
{
	struct impl *impl = (struct impl*)object;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	impl->callbacks = SPA_CALLBACKS_INIT(callbacks, data);

	return 0;
}

static int impl_node_sync(void *object, int seq)
{
	struct impl *impl = (struct impl*)object;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	spa_node_emit_result(&impl->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 *impl = (struct impl*)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(impl != NULL, -EINVAL);
	spa_return_val_if_fail(num != 0, -EINVAL);
	spa_return_val_if_fail(CHECK_PORT(impl, direction, port_id), -EINVAL);

	port = GET_PORT(impl, 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_libcamera_enum_controls(impl, port, seq, start, 0, num, filter);

	case SPA_PARAM_EnumFormat:
		return spa_libcamera_enum_format(impl, port, seq, start, num, filter);

	case SPA_PARAM_Format:
		if((res = port_get_format(impl, port, result.index, filter, &param, &b)) <= 0)
			return res;
		break;
	case SPA_PARAM_Buffers:
	{
		if (!port->current_format)
			return -EIO;
		if (result.index > 0)
			return 0;

		/* Get the number of buffers to be used from libcamera and send the same to pipewire
		 * so that exact number of buffers are allocated
		 */
		uint32_t n_buffers = port->streamConfig.bufferCount;

		param = (struct spa_pod*)spa_pod_builder_add_object(&b,
			SPA_TYPE_OBJECT_ParamBuffers, id,
			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(n_buffers, n_buffers, n_buffers),
			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(port->buffers_blocks),
			SPA_PARAM_BUFFERS_size,    SPA_POD_Int(port->streamConfig.frameSize),
			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(port->streamConfig.stride));
		break;
	}
	case SPA_PARAM_Meta:
		switch (result.index) {
		case 0:
			param = (struct spa_pod*)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;
		case 1:
			param = (struct spa_pod*)spa_pod_builder_add_object(&b,
				SPA_TYPE_OBJECT_ParamMeta, id,
				SPA_PARAM_META_type, SPA_POD_Id(SPA_META_VideoTransform),
				SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_videotransform)));
			break;
		default:
			return 0;
		}
		break;
	case SPA_PARAM_IO:
		switch (result.index) {
		case 0:
			param = (struct spa_pod*)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 = (struct spa_pod*)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 = (struct spa_pod*)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, &impl->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(&impl->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);

	if (++count != num)
		goto next;

	return 0;
}

static int port_set_format(struct impl *impl, struct port *port,
			   uint32_t flags, const struct spa_pod *format)
{
	struct spa_video_info info;
	int res;

	if (format == NULL) {
		if (!port->current_format)
			return 0;

		spa_libcamera_stream_off(impl);
		spa_libcamera_clear_buffers(impl, port);
		port->current_format.reset();

		spa_libcamera_close(impl);
		goto done;
	} else {
		spa_zero(info);
		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(impl->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(impl->log, "can't parse video raw");
				return -EINVAL;
			}

			if (port->current_format && info.media_type == port->current_format->media_type &&
			    info.media_subtype == port->current_format->media_subtype &&
			    info.info.raw.format == port->current_format->info.raw.format &&
			    info.info.raw.size.width == port->current_format->info.raw.size.width &&
			    info.info.raw.size.height == port->current_format->info.raw.size.height &&
			    info.info.raw.flags == port->current_format->info.raw.flags &&
			    (!(info.info.raw.flags & SPA_VIDEO_FLAG_MODIFIER) ||
			     (info.info.raw.modifier == port->current_format->info.raw.modifier)))
				return 0;
			break;
		case SPA_MEDIA_SUBTYPE_mjpg:
			if (spa_format_video_mjpg_parse(format, &info.info.mjpg) < 0)
				return -EINVAL;

			if (port->current_format && info.media_type == port->current_format->media_type &&
			    info.media_subtype == port->current_format->media_subtype &&
			    info.info.mjpg.size.width == port->current_format->info.mjpg.size.width &&
			    info.info.mjpg.size.height == port->current_format->info.mjpg.size.height)
				return 0;
			break;
		case SPA_MEDIA_SUBTYPE_h264:
			if (spa_format_video_h264_parse(format, &info.info.h264) < 0)
				return -EINVAL;

			if (port->current_format && info.media_type == port->current_format->media_type &&
			    info.media_subtype == port->current_format->media_subtype &&
			    info.info.h264.size.width == port->current_format->info.h264.size.width &&
			    info.info.h264.size.height == port->current_format->info.h264.size.height)
				return 0;
			break;
		default:
			return -EINVAL;
		}
	}

	if (port->current_format && !(flags & SPA_NODE_PARAM_FLAG_TEST_ONLY)) {
		spa_libcamera_use_buffers(impl, port, NULL, 0);
		port->current_format.reset();
	}

	if (spa_libcamera_set_format(impl, port, &info, flags & SPA_NODE_PARAM_FLAG_TEST_ONLY) < 0)
		return -EINVAL;

	if (!(flags & SPA_NODE_PARAM_FLAG_TEST_ONLY)) {
		port->current_format = info;
	}

    done:
	impl->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
	if (port->current_format) {
		impl->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
		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);
	} else {
		impl->params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
		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);
	}
	emit_port_info(impl, port, false);
	emit_node_info(impl, 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)
{
	struct impl *impl = (struct impl*)object;
	struct port *port;
	int res;

	spa_return_val_if_fail(object != NULL, -EINVAL);
	spa_return_val_if_fail(CHECK_PORT(impl, direction, port_id), -EINVAL);

	port = GET_PORT(impl, direction, port_id);

	switch (id) {
	case SPA_PARAM_Format:
		res = port_set_format(impl, 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 *impl = (struct impl*)object;
	struct port *port;
	int res;

	spa_return_val_if_fail(impl != NULL, -EINVAL);
	spa_return_val_if_fail(CHECK_PORT(impl, direction, port_id), -EINVAL);

	port = GET_PORT(impl, direction, port_id);

	if (port->n_buffers) {
		spa_libcamera_stream_off(impl);
		if ((res = spa_libcamera_clear_buffers(impl, port)) < 0)
			return res;
	}
	if (n_buffers > 0 && !port->current_format)
		return -EIO;
	if (n_buffers > MAX_BUFFERS)
		return -ENOSPC;
	if (buffers == NULL)
		return 0;

	if (flags & SPA_NODE_BUFFERS_FLAG_ALLOC) {
		res = spa_libcamera_alloc_buffers(impl, port, buffers, n_buffers);
	} else {
		res = spa_libcamera_use_buffers(impl, port, 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 *impl = (struct impl*)object;
	struct port *port;

	spa_return_val_if_fail(impl != NULL, -EINVAL);
	spa_return_val_if_fail(CHECK_PORT(impl, direction, port_id), -EINVAL);

	port = GET_PORT(impl, direction, port_id);

	switch (id) {
	case SPA_IO_Buffers:
		port->io = (struct spa_io_buffers*)data;
		break;
	case SPA_IO_Control:
		port->control = (struct spa_io_sequence*)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 *impl = (struct impl*)object;
	struct port *port;
	int res;

	spa_return_val_if_fail(impl != NULL, -EINVAL);
	spa_return_val_if_fail(port_id == 0, -EINVAL);

	port = GET_OUT_PORT(impl, port_id);

	spa_return_val_if_fail(buffer_id < port->n_buffers, -EINVAL);

	res = spa_libcamera_buffer_recycle(impl, port, buffer_id);

	return res;
}

static int process_control(struct impl *impl, 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_libcamera_set_control(impl, prop);
			}
			break;
		}
		default:
			break;
		}
	}
	return 0;
}

static int impl_node_process(void *object)
{
	struct impl *impl = (struct impl*)object;
	int res;
	struct spa_io_buffers *io;
	struct port *port;
	struct buffer *b;

	spa_return_val_if_fail(impl != NULL, -EINVAL);

	port = GET_OUT_PORT(impl, 0);
	if ((io = port->io) == NULL)
		return -EIO;

	if (port->control)
		process_control(impl, &port->control->sequence);

	spa_log_trace(impl->log, "%p; status %d", impl, io->status);

	if (io->status == SPA_STATUS_HAVE_DATA) {
		return SPA_STATUS_HAVE_DATA;
	}

	if (io->buffer_id < port->n_buffers) {
		if ((res = spa_libcamera_buffer_recycle(impl, port, 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(impl->log, "%p: dequeue buffer %d", impl, 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 = {
	.version = 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 *impl;

	spa_return_val_if_fail(handle != NULL, -EINVAL);
	spa_return_val_if_fail(interface != NULL, -EINVAL);

	impl = (struct impl *) handle;

	if (spa_streq(type, SPA_TYPE_INTERFACE_Node))
		*interface = &impl->node;
	else
		return -ENOENT;

	return 0;
}

static int impl_clear(struct spa_handle *handle)
{
	std::destroy_at(reinterpret_cast<impl *>(handle));
	return 0;
}

impl::impl(spa_log *log, spa_loop *data_loop, spa_system *system,
	   std::shared_ptr<CameraManager> manager, std::shared_ptr<Camera> camera, std::string device_id)
	: handle({ SPA_VERSION_HANDLE, impl_get_interface, impl_clear }),
	  log(log),
	  data_loop(data_loop),
	  system(system),
	  device_id(std::move(device_id)),
	  out_ports{{this}},
	  manager(std::move(manager)),
	  camera(std::move(camera))
{
	libcamera_log_topic_init(log);

	spa_hook_list_init(&hooks);

	node.iface = SPA_INTERFACE_INIT(
			SPA_TYPE_INTERFACE_Node,
			SPA_VERSION_NODE,
			&impl_node, this);

	params[NODE_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
	params[NODE_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
	params[NODE_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
	params[NODE_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);

	info.max_output_ports = 1;
	info.flags = SPA_NODE_FLAG_RT;
	info.params = params;
	info.n_params = N_NODE_PARAMS;

	latency[SPA_DIRECTION_INPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_INPUT);
	latency[SPA_DIRECTION_OUTPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT);
}

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)
{
	const char *str;
	int res;

	spa_return_val_if_fail(factory != NULL, -EINVAL);
	spa_return_val_if_fail(handle != NULL, -EINVAL);

	auto log = static_cast<spa_log *>(spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log));
	auto data_loop = static_cast<spa_loop *>(spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop));
	auto system = static_cast<spa_system *>(spa_support_find(support, n_support, SPA_TYPE_INTERFACE_System));

	if (!data_loop) {
		spa_log_error(log, "a data_loop is needed");
		return -EINVAL;
	}

	if (!system) {
		spa_log_error(log, "a system is needed");
		return -EINVAL;
	}

	auto manager = libcamera_manager_acquire(res);
	if (!manager) {
		spa_log_error(log, "can't start camera manager: %s", spa_strerror(res));
		return res;
	}

	std::string device_id;
	if (info && (str = spa_dict_lookup(info, SPA_KEY_API_LIBCAMERA_PATH)))
		device_id = str;

	auto camera = manager->get(device_id);
	if (!camera) {
		spa_log_error(log, "unknown camera id %s", device_id.c_str());
		return -ENOENT;
	}

	new (handle) impl(log, data_loop, system,
			  std::move(manager), std::move(camera), std::move(device_id));

	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;
}

extern "C" {
const struct spa_handle_factory spa_libcamera_source_factory = {
	SPA_VERSION_HANDLE_FACTORY,
	SPA_NAME_API_LIBCAMERA_SOURCE,
	NULL,
	impl_get_size,
	impl_init,
	impl_enum_interface_info,
};
}