text: /* PipeWire
   *
   * 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 <stdio.h>
  #include <sys/mman.h>
  
  #define WIDTH   640
  #define HEIGHT  480
  #define BPP    3
  
  #include "sdl.h"
  
  #include <spa/param/video/format-utils.h>
  #include <spa/param/props.h>
  #include <spa/pod/filter.h>
  #include <spa/node/io.h>
  #include <spa/node/utils.h>
  #include <spa/debug/format.h>
  #include <spa/utils/names.h>
  
  #include <pipewire/impl.h>
  
  struct data {
  	SDL_Renderer *renderer;
  	SDL_Window *window;
  	SDL_Texture *texture;
  
  	struct pw_main_loop *loop;
  
  	struct pw_context *context;
  	struct pw_core *core;
  
  	struct spa_port_info info;
  	struct spa_param_info params[4];
  
  	struct spa_node impl_node;
  	struct spa_io_buffers *io;
  
  	struct spa_hook_list hooks;
  
  	struct spa_video_info_raw format;
  	int32_t stride;
  
  	struct spa_buffer *buffers[32];
  	int n_buffers;
  
  	struct pw_proxy *out, *in, *link;
  };
  
  static void handle_events(struct data *data)
  {
  	SDL_Event event;
  	while (SDL_PollEvent(&event)) {
  		switch (event.type) {
  		case SDL_QUIT:
  			pw_main_loop_quit(data->loop);
  			break;
  		}
  	}
  }
  
  static int impl_set_io(void *object, uint32_t id, void *data, size_t size)
  {
  	return 0;
  }
  
  static int impl_send_command(void *object, const struct spa_command *command)
  {
  	return 0;
  }
  
  static int impl_add_listener(void *object,
  		struct spa_hook *listener,
  		const struct spa_node_events *events,
  		void *data)
  {
  	struct data *d = object;
  	struct spa_hook_list save;
  
  	spa_hook_list_isolate(&d->hooks, &save, listener, events, data);
  
  	spa_node_emit_port_info(&d->hooks, SPA_DIRECTION_INPUT, 0, &d->info);
  
  	spa_hook_list_join(&d->hooks, &save);
  
  	return 0;
  }
  
  static int impl_set_callbacks(void *object,
  			      const struct spa_node_callbacks *callbacks, void *data)
  {
  	return 0;
  }
  
  static int impl_port_set_io(void *object, enum spa_direction direction, uint32_t port_id,
  			    uint32_t id, void *data, size_t size)
  {
  	struct data *d = object;
  
  	if (id == SPA_IO_Buffers)
  		d->io = data;
  	else
  		return -ENOENT;
  
  	return 0;
  }
  
  static int impl_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 data *d = 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;
  
  	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:
  	{
  		SDL_RendererInfo info;
  
  		if (result.index > 0)
  			return 0;
  
  		SDL_GetRendererInfo(d->renderer, &info);
  		param = sdl_build_formats(&info, &b);
  		break;
  	}
  	case SPA_PARAM_Buffers:
  		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(2, 1, 32),
  			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(1),
  			SPA_PARAM_BUFFERS_size,    SPA_POD_Int(d->stride * d->format.size.height),
  			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(d->stride),
  			SPA_PARAM_BUFFERS_align,   SPA_POD_Int(16));
  		break;
  
  	case SPA_PARAM_Meta:
  		if (result.index > 0)
  			return 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 -ENOENT;
  	}
  
  	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
  		goto next;
  
  	spa_node_emit_result(&d->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
  
  	if (++count != num)
  		goto next;
  
  	return 0;
  }
  
  static int port_set_format(void *object, enum spa_direction direction, uint32_t port_id,
  			   uint32_t flags, const struct spa_pod *format)
  {
  	struct data *d = object;
  	Uint32 sdl_format;
  	void *dest;
  
  	if (format == NULL)
  		return 0;
  
  	spa_debug_format(0, NULL, format);
  
  	spa_format_video_raw_parse(format, &d->format);
  
  	sdl_format = id_to_sdl_format(d->format.format);
  	if (sdl_format == SDL_PIXELFORMAT_UNKNOWN)
  		return -EINVAL;
  
  	d->texture = SDL_CreateTexture(d->renderer,
  				       sdl_format,
  				       SDL_TEXTUREACCESS_STREAMING,
  				       d->format.size.width,
  				       d->format.size.height);
  	SDL_LockTexture(d->texture, NULL, &dest, &d->stride);
  	SDL_UnlockTexture(d->texture);
  
  	d->info.change_mask = SPA_PORT_CHANGE_MASK_PARAMS;
  	d->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
  	d->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
  	spa_node_emit_port_info(&d->hooks, SPA_DIRECTION_INPUT, 0, &d->info);
  
  	return 0;
  }
  
  static int impl_port_set_param(void *object,
  			       enum spa_direction direction, uint32_t port_id,
  			       uint32_t id, uint32_t flags,
  			       const struct spa_pod *param)
  {
  	if (id == SPA_PARAM_Format) {
  		return port_set_format(object, direction, port_id, flags, param);
  	}
  	else
  		return -ENOENT;
  }
  
  static int impl_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 data *d = object;
  	uint32_t i;
  
  	for (i = 0; i < n_buffers; i++)
  		d->buffers[i] = buffers[i];
  	d->n_buffers = n_buffers;
  	return 0;
  }
  
  static int do_render(struct spa_loop *loop, bool async, uint32_t seq,
  		     const void *_data, size_t size, void *user_data)
  {
  	struct data *d = user_data;
  	struct spa_buffer *buf;
  	uint8_t *map;
  	void *sdata, *ddata;
  	int sstride, dstride, ostride;
  	uint32_t i;
  	uint8_t *src, *dst;
  
  	buf = d->buffers[d->io->buffer_id];
  
  	if (buf->datas[0].type == SPA_DATA_MemFd ||
  	    buf->datas[0].type == SPA_DATA_DmaBuf) {
  		map = mmap(NULL, buf->datas[0].maxsize + buf->datas[0].mapoffset, PROT_READ,
  			   MAP_PRIVATE, buf->datas[0].fd, 0);
  		sdata = SPA_PTROFF(map, buf->datas[0].mapoffset, uint8_t);
  	} else if (buf->datas[0].type == SPA_DATA_MemPtr) {
  		map = NULL;
  		sdata = buf->datas[0].data;
  	} else
  		return -EINVAL;
  
  	if (SDL_LockTexture(d->texture, NULL, &ddata, &dstride) < 0) {
  		fprintf(stderr, "Couldn't lock texture: %s\n", SDL_GetError());
  		return -EIO;
  	}
  	sstride = buf->datas[0].chunk->stride;
  	ostride = SPA_MIN(sstride, dstride);
  
  	src = sdata;
  	dst = ddata;
  	for (i = 0; i < d->format.size.height; i++) {
  		memcpy(dst, src, ostride);
  		src += sstride;
  		dst += dstride;
  	}
  	SDL_UnlockTexture(d->texture);
  
  	SDL_RenderClear(d->renderer);
  	SDL_RenderCopy(d->renderer, d->texture, NULL, NULL);
  	SDL_RenderPresent(d->renderer);
  
  	if (map)
  		munmap(map, buf->datas[0].maxsize + buf->datas[0].mapoffset);
  
  	return 0;
  }
  
  static int impl_node_process(void *object)
  {
  	struct data *d = object;
  	int res;
  
  	if ((res = pw_loop_invoke(pw_main_loop_get_loop(d->loop), do_render,
  				  SPA_ID_INVALID, NULL, 0, true, d)) < 0)
  		return res;
  
  	handle_events(d);
  
  	d->io->status = SPA_STATUS_NEED_DATA;
  
  	return SPA_STATUS_NEED_DATA;
  }
  
  static const struct spa_node_methods impl_node = {
  	SPA_VERSION_NODE_METHODS,
  	.add_listener = impl_add_listener,
  	.set_callbacks = impl_set_callbacks,
  	.set_io = impl_set_io,
  	.send_command = impl_send_command,
  	.port_set_io = impl_port_set_io,
  	.port_enum_params = impl_port_enum_params,
  	.port_set_param = impl_port_set_param,
  	.port_use_buffers = impl_port_use_buffers,
  	.process = impl_node_process,
  };
  
  static int make_nodes(struct data *data)
  {
  	struct pw_properties *props;
  
  	data->impl_node.iface = SPA_INTERFACE_INIT(
  			SPA_TYPE_INTERFACE_Node,
  			SPA_VERSION_NODE,
  			&impl_node, data);
  
  	data->info = SPA_PORT_INFO_INIT();
  	data->info.change_mask =
  		SPA_PORT_CHANGE_MASK_FLAGS |
  		SPA_PORT_CHANGE_MASK_PARAMS;
  	data->info.flags = 0;
  	data->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
  	data->params[1] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
  	data->params[2] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
  	data->params[3] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
  	data->info.params = data->params;
  	data->info.n_params = SPA_N_ELEMENTS(data->params);
  
  	data->in = pw_core_export(data->core,
  			SPA_TYPE_INTERFACE_Node,
  			NULL,
  			&data->impl_node,
  			0);
  
  	props = pw_properties_new(
  			SPA_KEY_LIBRARY_NAME, "v4l2/libspa-v4l2",
  			SPA_KEY_FACTORY_NAME, SPA_NAME_API_V4L2_SOURCE,
  			NULL);
  
  	data->out = pw_core_create_object(data->core,
  			"spa-node-factory",
  			PW_TYPE_INTERFACE_Node,
  			PW_VERSION_NODE,
  			&props->dict, 0);
  
  
  	while (true) {
  
  		if (pw_proxy_get_bound_id(data->out) != SPA_ID_INVALID &&
  		    pw_proxy_get_bound_id(data->in) != SPA_ID_INVALID)
  			break;
  
  		pw_loop_iterate(pw_main_loop_get_loop(data->loop), -1);
  	}
  
  	pw_properties_clear(props);
  
  	pw_properties_setf(props,
  			PW_KEY_LINK_OUTPUT_NODE, "%d", pw_proxy_get_bound_id(data->out));
  	pw_properties_setf(props,
  			PW_KEY_LINK_INPUT_NODE, "%d", pw_proxy_get_bound_id(data->in));
  
  	data->link = pw_core_create_object(data->core,
  			"link-factory",
  			PW_TYPE_INTERFACE_Link,
  			PW_VERSION_LINK,
  			&props->dict, 0);
  
  	pw_properties_free(props);
  
  	return 0;
  }
  
  int main(int argc, char *argv[])
  {
  	struct data data = { 0, };
  
  	pw_init(&argc, &argv);
  
  	data.loop = pw_main_loop_new(NULL);
  	data.context = pw_context_new(
  			pw_main_loop_get_loop(data.loop),
  			pw_properties_new(
  				PW_KEY_CORE_DAEMON, "false",
  				NULL), 0);
  
  	spa_hook_list_init(&data.hooks);
  
  	pw_context_load_module(data.context, "libpipewire-module-spa-node-factory", NULL, NULL);
  	pw_context_load_module(data.context, "libpipewire-module-link-factory", NULL, NULL);
  
  	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
  		printf("can't initialize SDL: %s\n", SDL_GetError());
  		return -1;
  	}
  
  	if (SDL_CreateWindowAndRenderer
  	    (WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
  		printf("can't create window: %s\n", SDL_GetError());
  		return -1;
  	}
  
  	data.core = pw_context_connect_self(data.context, NULL, 0);
  	if (data.core == NULL) {
  		printf("can't connect to core: %m\n");
  		return -1;
  	}
  
  	make_nodes(&data);
  
  	pw_main_loop_run(data.loop);
  
  	pw_proxy_destroy(data.link);
  	pw_proxy_destroy(data.in);
  	pw_proxy_destroy(data.out);
  	pw_context_destroy(data.context);
  	pw_main_loop_destroy(data.loop);
  	pw_deinit();
  
  	return 0;
  }
  