Adding upstream version 0.3.65.upstream/0.3.65upstream

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

1 files changed, 1016 insertions, 0 deletions

diff --git a/spa/plugins/vulkan/vulkan-compute-source.c b/spa/plugins/vulkan/vulkan-compute-source.c
new file mode 100644
index 0000000..4602e5d
--- /dev/null
+++ b/spa/plugins/vulkan/vulkan-compute-source.c
@@ -0,0 +1,1016 @@
+/* Spa
+ *
+ * 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.
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.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/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/node/keys.h>
+#include <spa/param/video/format-utils.h>
+#include <spa/param/param.h>
+#include <spa/pod/filter.h>
+
+#include "vulkan-utils.h"
+
+#define NAME "vulkan-compute-source"
+
+#define FRAMES_TO_TIME(this,f) ((this->position->video.framerate.denom * (f) * SPA_NSEC_PER_SEC) / \
+                                (this->position->video.framerate.num))
+
+#define DEFAULT_LIVE true
+
+struct props {
+	bool live;
+};
+
+static void reset_props(struct props *props)
+{
+	props->live = DEFAULT_LIVE;
+}
+
+struct buffer {
+	uint32_t id;
+#define BUFFER_FLAG_OUT (1<<0)
+	uint32_t flags;
+	struct spa_buffer *outbuf;
+	struct spa_meta_header *h;
+	struct spa_list link;
+};
+
+struct port {
+	uint64_t info_all;
+	struct spa_port_info info;
+	struct spa_param_info params[5];
+
+	struct spa_io_buffers *io;
+
+	bool have_format;
+	struct spa_video_info current_format;
+
+	struct buffer buffers[MAX_BUFFERS];
+	uint32_t n_buffers;
+
+	struct spa_list empty;
+	struct spa_list ready;
+};
+
+struct impl {
+	struct spa_handle handle;
+	struct spa_node node;
+
+	struct spa_log *log;
+	struct spa_loop *data_loop;
+	struct spa_system *data_system;
+
+	struct spa_io_clock *clock;
+	struct spa_io_position *position;
+
+	uint64_t info_all;
+	struct spa_node_info info;
+	struct spa_param_info params[2];
+	struct props props;
+
+	struct spa_hook_list hooks;
+	struct spa_callbacks callbacks;
+
+	bool async;
+	struct spa_source timer_source;
+	struct itimerspec timerspec;
+
+	bool started;
+	uint64_t start_time;
+	uint64_t elapsed_time;
+
+	uint64_t frame_count;
+
+	struct vulkan_state state;
+	struct port port;
+};
+
+#define CHECK_PORT(this,d,p)  ((d) == SPA_DIRECTION_OUTPUT && (p) < 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;
+
+	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_live),
+				SPA_PROP_INFO_description, SPA_POD_String("Configure live mode of the source"),
+				SPA_PROP_INFO_type, SPA_POD_Bool(p->live));
+			break;
+		default:
+			return 0;
+		}
+		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_live,        SPA_POD_Bool(p->live));
+			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 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:
+		if (size > 0 && size < sizeof(struct spa_io_clock))
+			return -EINVAL;
+		this->clock = data;
+		break;
+	case SPA_IO_Position:
+		this->position = data;
+		break;
+	default:
+		return -ENOENT;
+	}
+	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 port *port = &this->port;
+
+		if (param == NULL) {
+			reset_props(p);
+			return 0;
+		}
+		spa_pod_parse_object(param,
+			SPA_TYPE_OBJECT_Props, NULL,
+			SPA_PROP_live,        SPA_POD_OPT_Bool(&p->live));
+
+		if (p->live)
+			port->info.flags |= SPA_PORT_FLAG_LIVE;
+		else
+			port->info.flags &= ~SPA_PORT_FLAG_LIVE;
+		break;
+	}
+	default:
+		return -ENOENT;
+	}
+	return 0;
+}
+
+
+static void set_timer(struct impl *this, bool enabled)
+{
+	if (this->async || this->props.live) {
+		if (enabled) {
+			if (this->props.live) {
+				uint64_t next_time = this->start_time + this->elapsed_time;
+				this->timerspec.it_value.tv_sec = next_time / SPA_NSEC_PER_SEC;
+				this->timerspec.it_value.tv_nsec = next_time % SPA_NSEC_PER_SEC;
+			} else {
+				this->timerspec.it_value.tv_sec = 0;
+				this->timerspec.it_value.tv_nsec = 1;
+			}
+		} else {
+			this->timerspec.it_value.tv_sec = 0;
+			this->timerspec.it_value.tv_nsec = 0;
+		}
+		spa_system_timerfd_settime(this->data_system,
+				this->timer_source.fd, SPA_FD_TIMER_ABSTIME, &this->timerspec, NULL);
+	}
+}
+
+static int read_timer(struct impl *this)
+{
+	uint64_t expirations;
+	int res = 0;
+
+	if (this->async || this->props.live) {
+		if ((res = spa_system_timerfd_read(this->data_system,
+						this->timer_source.fd, &expirations)) < 0) {
+			if (res != -EAGAIN)
+				spa_log_error(this->log, NAME " %p: timerfd error: %s",
+						this, spa_strerror(res));
+		}
+	}
+	return res;
+}
+
+static int make_buffer(struct impl *this)
+{
+	struct buffer *b;
+	struct port *port = &this->port;
+	uint32_t n_bytes;
+	int res;
+
+	if (read_timer(this) < 0)
+		return 0;
+
+	if ((res = spa_vulkan_ready(&this->state)) < 0) {
+		res = SPA_STATUS_OK;
+		goto next;
+	}
+
+	if (spa_list_is_empty(&port->empty)) {
+		set_timer(this, false);
+		spa_log_error(this->log, NAME " %p: out of buffers", this);
+		return -EPIPE;
+	}
+	b = spa_list_first(&port->empty, struct buffer, link);
+	spa_list_remove(&b->link);
+
+	n_bytes = b->outbuf->datas[0].maxsize;
+
+	spa_log_trace(this->log, NAME " %p: dequeue buffer %d", this, b->id);
+
+	this->state.constants.time = this->elapsed_time / (float) SPA_NSEC_PER_SEC;
+	this->state.constants.frame = this->frame_count;
+
+	this->state.streams[0].pending_buffer_id = b->id;
+	spa_vulkan_process(&this->state);
+
+	if (this->state.streams[0].ready_buffer_id != SPA_ID_INVALID) {
+		struct buffer *b = &port->buffers[this->state.streams[0].ready_buffer_id];
+
+		this->state.streams[0].ready_buffer_id = SPA_ID_INVALID;
+
+		spa_log_trace(this->log, NAME " %p: ready buffer %d", this, b->id);
+
+		b->outbuf->datas[0].chunk->offset = 0;
+		b->outbuf->datas[0].chunk->size = n_bytes;
+		b->outbuf->datas[0].chunk->stride = this->position->video.stride;
+
+		if (b->h) {
+			b->h->seq = this->frame_count;
+			b->h->pts = this->start_time + this->elapsed_time;
+			b->h->dts_offset = 0;
+		}
+
+		spa_list_append(&port->ready, &b->link);
+
+		res = SPA_STATUS_HAVE_DATA;
+	}
+next:
+	this->frame_count++;
+	this->elapsed_time = FRAMES_TO_TIME(this, this->frame_count);
+	set_timer(this, true);
+
+	return res;
+}
+
+static inline void reuse_buffer(struct impl *this, struct port *port, uint32_t id)
+{
+	struct buffer *b = &port->buffers[id];
+
+	if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_OUT)) {
+		spa_log_trace(this->log, NAME " %p: reuse buffer %d", this, id);
+
+		SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_OUT);
+		spa_list_append(&port->empty, &b->link);
+
+		if (!this->props.live)
+			set_timer(this, true);
+	}
+}
+
+static void on_output(struct spa_source *source)
+{
+	struct impl *this = source->data;
+	struct port *port = &this->port;
+	struct spa_io_buffers *io = port->io;
+	int res;
+
+	if (io == NULL)
+		return;
+
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return;
+
+	if (io->buffer_id < port->n_buffers) {
+		reuse_buffer(this, port, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	res = make_buffer(this);
+
+	if (!spa_list_is_empty(&port->ready)) {
+		struct buffer *b = spa_list_first(&port->ready, struct buffer, link);
+		spa_list_remove(&b->link);
+		SPA_FLAG_SET(b->flags, BUFFER_FLAG_OUT);
+
+		io->buffer_id = b->id;
+		io->status = SPA_STATUS_HAVE_DATA;
+        }
+	spa_node_call_ready(&this->callbacks, res);
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+	struct impl *this = object;
+	struct port *port;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(command != NULL, -EINVAL);
+
+	port = &this->port;
+
+	switch (SPA_NODE_COMMAND_ID(command)) {
+	case SPA_NODE_COMMAND_Start:
+	{
+		struct timespec now;
+
+		if (!port->have_format)
+			return -EIO;
+		if (port->n_buffers == 0)
+			return -EIO;
+
+		if (this->started)
+			return 0;
+
+		clock_gettime(CLOCK_MONOTONIC, &now);
+		if (this->props.live)
+			this->start_time = SPA_TIMESPEC_TO_NSEC(&now);
+		else
+			this->start_time = 0;
+		this->frame_count = 0;
+		this->elapsed_time = 0;
+
+		this->started = true;
+		set_timer(this, true);
+		spa_vulkan_start(&this->state);
+		break;
+	}
+	case SPA_NODE_COMMAND_Suspend:
+	case SPA_NODE_COMMAND_Pause:
+		if (!this->started)
+			return 0;
+
+		this->started = false;
+		set_timer(this, false);
+		spa_vulkan_stop(&this->state);
+		break;
+	default:
+		return -ENOTSUP;
+	}
+	return 0;
+}
+
+static const struct spa_dict_item node_info_items[] = {
+	{ SPA_KEY_MEDIA_CLASS, "Video/Source" },
+	{ 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(node_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) {
+		struct spa_dict_item items[1];
+
+		items[0] = SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "32 bit float RGBA video");
+		port->info.props = &SPA_DICT_INIT(items, 1);
+		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, &this->port, 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_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 port_enum_formats(void *object,
+			     enum spa_direction direction, uint32_t port_id,
+			     uint32_t index,
+			     const struct spa_pod *filter,
+			     struct spa_pod **param,
+			     struct spa_pod_builder *builder)
+{
+	switch (index) {
+	case 0:
+		*param = spa_pod_builder_add_object(builder,
+			SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+			SPA_FORMAT_mediaType,       SPA_POD_Id(SPA_MEDIA_TYPE_video),
+			SPA_FORMAT_mediaSubtype,    SPA_POD_Id(SPA_MEDIA_SUBTYPE_dsp),
+			SPA_FORMAT_VIDEO_format,    SPA_POD_Id(SPA_VIDEO_FORMAT_DSP_F32));
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+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_builder b = { 0 };
+	uint8_t buffer[1024];
+	struct spa_pod *param;
+	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 = &this->port;
+
+	result.id = id;
+	result.next = start;
+      next:
+	result.index = result.next++;
+
+	spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+	switch (id) {
+	case SPA_PARAM_EnumFormat:
+		if ((res = port_enum_formats(this, direction, port_id,
+						result.index, filter, &param, &b)) <= 0)
+			return res;
+		break;
+
+	case SPA_PARAM_Format:
+		if (!port->have_format)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		param = spa_format_video_dsp_build(&b, id, &port->current_format.info.dsp);
+		break;
+
+	case SPA_PARAM_Buffers:
+	{
+		if (!port->have_format)
+			return -EIO;
+		if (this->position == NULL)
+			return -EIO;
+		if (result.index > 0)
+			return 0;
+
+		spa_log_debug(this->log, NAME" %p: %dx%d stride %d", this,
+				this->position->video.size.width,
+				this->position->video.size.height,
+				this->position->video.stride);
+
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamBuffers, id,
+			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
+			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
+			SPA_PARAM_BUFFERS_size,    SPA_POD_Int(this->position->video.stride *
+								this->position->video.size.height),
+			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(this->position->video.stride));
+		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;
+	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 clear_buffers(struct impl *this, struct port *port)
+{
+	if (port->n_buffers > 0) {
+		spa_log_debug(this->log, NAME " %p: clear buffers", this);
+		spa_vulkan_use_buffers(&this->state, &this->state.streams[0], 0, 0, NULL);
+		port->n_buffers = 0;
+		spa_list_init(&port->empty);
+		spa_list_init(&port->ready);
+		this->started = false;
+		set_timer(this, false);
+	}
+	return 0;
+}
+
+static int port_set_format(struct impl *this, struct port *port,
+			   uint32_t flags,
+			   const struct spa_pod *format)
+{
+	int res;
+
+	if (format == NULL) {
+		port->have_format = false;
+		clear_buffers(this, port);
+		spa_vulkan_unprepare(&this->state);
+	} else {
+		struct spa_video_info info = { 0 };
+
+		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+			return res;
+
+		if (info.media_type != SPA_MEDIA_TYPE_video &&
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_dsp)
+			return -EINVAL;
+
+		if (spa_format_video_dsp_parse(format, &info.info.dsp) < 0)
+			return -EINVAL;
+
+		if (info.info.dsp.format != SPA_VIDEO_FORMAT_DSP_F32)
+			return -EINVAL;
+
+		this->state.constants.width = this->position->video.size.width;
+		this->state.constants.height = this->position->video.size.height;
+
+		port->current_format = info;
+		port->have_format = true;
+		spa_vulkan_prepare(&this->state);
+	}
+
+	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+	if (port->have_format) {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+	} else {
+		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	}
+	emit_port_info(this, port, 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 *this = object;
+	struct port *port;
+	int res;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(node, direction, port_id), -EINVAL);
+	port = &this->port;
+
+	switch (id) {
+	case SPA_PARAM_Format:
+		res = port_set_format(this, port, flags, param);
+		break;
+	default:
+		return -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;
+	uint32_t i;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+	port = &this->port;
+
+	clear_buffers(this, port);
+
+	if (n_buffers > 0 && !port->have_format)
+		return -EIO;
+	if (n_buffers > MAX_BUFFERS)
+		return -ENOSPC;
+
+	for (i = 0; i < n_buffers; i++) {
+		struct buffer *b;
+
+		b = &port->buffers[i];
+		b->id = i;
+		b->outbuf = buffers[i];
+		b->flags = 0;
+		b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+		spa_list_append(&port->empty, &b->link);
+	}
+	spa_vulkan_use_buffers(&this->state, &this->state.streams[0], flags, n_buffers, buffers);
+	port->n_buffers = n_buffers;
+
+	return 0;
+}
+
+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 = &this->port;
+
+	switch (id) {
+	case SPA_IO_Buffers:
+		port->io = 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;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+	spa_return_val_if_fail(port_id == 0, -EINVAL);
+	port = &this->port;
+	spa_return_val_if_fail(buffer_id < port->n_buffers, -EINVAL);
+
+	reuse_buffer(this, port, buffer_id);
+
+	return 0;
+}
+
+static int impl_node_process(void *object)
+{
+	struct impl *this = object;
+	struct port *port;
+	struct spa_io_buffers *io;
+
+	spa_return_val_if_fail(this != NULL, -EINVAL);
+
+	port = &this->port;
+	if ((io = port->io) == NULL)
+		return -EIO;
+
+	if (io->status == SPA_STATUS_HAVE_DATA)
+		return SPA_STATUS_HAVE_DATA;
+
+	if (io->buffer_id < port->n_buffers) {
+		reuse_buffer(this, port, io->buffer_id);
+		io->buffer_id = SPA_ID_INVALID;
+	}
+
+	if (!this->props.live)
+		return make_buffer(this);
+	else
+		return SPA_STATUS_OK;
+}
+
+static const struct spa_node_methods impl_node = {
+	SPA_VERSION_NODE_METHODS,
+	.add_listener = impl_node_add_listener,
+	.set_callbacks = impl_node_set_callbacks,
+	.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 do_remove_timer(struct spa_loop *loop, bool async, uint32_t seq, const void *data, size_t size, void *user_data)
+{
+	struct impl *this = user_data;
+	spa_loop_remove_source(this->data_loop, &this->timer_source);
+	return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+	struct impl *this;
+
+	spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+	this = (struct impl *) handle;
+
+	if (this->data_loop)
+		spa_loop_invoke(this->data_loop, do_remove_timer, 0, NULL, 0, true, this);
+	spa_system_close(this->data_system, this->timer_source.fd);
+
+	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;
+	struct port *port;
+
+	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);
+	this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+	this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+
+	spa_hook_list_init(&this->hooks);
+
+	this->node.iface = SPA_INTERFACE_INIT(
+			SPA_TYPE_INTERFACE_Node,
+			SPA_VERSION_NODE,
+			&impl_node, this);
+
+	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[0] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	this->params[1] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	this->info.params = this->params;
+	this->info.n_params = 2;
+	reset_props(&this->props);
+
+	this->timer_source.func = on_output;
+	this->timer_source.data = this;
+	this->timer_source.fd = spa_system_timerfd_create(this->data_system, CLOCK_MONOTONIC,
+							  SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+	this->timer_source.mask = SPA_IO_IN;
+	this->timer_source.rmask = 0;
+	this->timerspec.it_value.tv_sec = 0;
+	this->timerspec.it_value.tv_nsec = 0;
+	this->timerspec.it_interval.tv_sec = 0;
+	this->timerspec.it_interval.tv_nsec = 0;
+
+	if (this->data_loop)
+		spa_loop_add_source(this->data_loop, &this->timer_source);
+
+	port = &this->port;
+	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+			SPA_PORT_CHANGE_MASK_PARAMS |
+			SPA_PORT_CHANGE_MASK_PROPS;
+	port->info = SPA_PORT_INFO_INIT();
+	port->info.flags = SPA_PORT_FLAG_NO_REF | SPA_PORT_FLAG_CAN_ALLOC_BUFFERS;
+	if (this->props.live)
+		port->info.flags |= SPA_PORT_FLAG_LIVE;
+	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+	port->info.params = port->params;
+	port->info.n_params = 5;
+	spa_list_init(&port->empty);
+	spa_list_init(&port->ready);
+
+	this->state.log = this->log;
+	spa_vulkan_init_stream(&this->state, &this->state.streams[0],
+			SPA_DIRECTION_OUTPUT, NULL);
+	this->state.shaderName = "spa/plugins/vulkan/shaders/main.spv";
+	this->state.n_streams = 1;
+
+	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);
+
+	switch (*index) {
+	case 0:
+		*info = &impl_interfaces[*index];
+		break;
+	default:
+		return 0;
+	}
+	(*index)++;
+	return 1;
+}
+
+static const struct spa_dict_item info_items[] = {
+	{ SPA_KEY_FACTORY_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ SPA_KEY_FACTORY_DESCRIPTION, "Generate video frames using a vulkan compute shader" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_vulkan_compute_source_factory = {
+	SPA_VERSION_HANDLE_FACTORY,
+	SPA_NAME_API_VULKAN_COMPUTE_SOURCE,
+	&info,
+	impl_get_size,
+	impl_init,
+	impl_enum_interface_info,
+};