1 files changed, 315 insertions, 0 deletions
diff --git a/src/examples/video-dsp-play.c b/src/examples/video-dsp-play.c
new file mode 100644
index 0000000..6068e2a
--- /dev/null
+++ b/src/examples/video-dsp-play.c
@@ -0,0 +1,315 @@
+/* PipeWire
+ *
+ * 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.
+ */
+
+/*
+ [title]
+ Video input stream using \ref pw_filter "pw_filter".
+ [title]
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+#include <spa/param/video/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/debug/format.h>
+
+#include <pipewire/pipewire.h>
+#include <pipewire/filter.h>
+
+#define WIDTH   640
+#define HEIGHT  480
+#define BPP    3
+
+#define MAX_BUFFERS	64
+
+#include "sdl.h"
+
+struct pixel {
+	float r, g, b, a;
+};
+
+struct data {
+	const char *target;
+
+	SDL_Renderer *renderer;
+	SDL_Window *window;
+	SDL_Texture *texture;
+	SDL_Texture *cursor;
+
+	struct pw_main_loop *loop;
+
+	struct pw_filter *filter;
+	struct spa_hook filter_listener;
+
+	void *in_port;
+
+	struct spa_io_position *position;
+	struct spa_video_info_dsp format;
+
+	int counter;
+	SDL_Rect rect;
+	SDL_Rect cursor_rect;
+};
+
+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;
+		}
+	}
+}
+
+/* our data processing function is in general:
+ *
+ *  struct pw_buffer *b;
+ *  b = pw_filter_dequeue_buffer(port);
+ *
+ *  .. do stuff with buffer ...
+ *
+ *  pw_filter_queue_buffer(port, b);
+ */
+static void
+on_process(void *_data, struct spa_io_position *position)
+{
+	struct data *data = _data;
+	struct pw_buffer *b;
+	struct spa_buffer *buf;
+	void *sdata, *ddata;
+	int sstride, dstride;
+	uint32_t i, j;
+	uint8_t *src, *dst;
+
+	b = NULL;
+	while (true) {
+		struct pw_buffer *t;
+		if ((t = pw_filter_dequeue_buffer(data->in_port)) == NULL)
+			break;
+		if (b)
+			pw_filter_queue_buffer(data->in_port, b);
+		b = t;
+	}
+	if (b == NULL) {
+		pw_log_warn("out of buffers: %m");
+		return;
+	}
+
+	buf = b->buffer;
+
+	pw_log_trace("new buffer %p %dx%d", buf,
+			data->position->video.size.width, data->position->video.size.height);
+
+	handle_events(data);
+
+	if ((sdata = buf->datas[0].data) == NULL) {
+		pw_log_error("no buffer data");
+		goto done;
+	}
+
+	if (SDL_LockTexture(data->texture, NULL, &ddata, &dstride) < 0) {
+		pw_log_error("Couldn't lock texture: %s", SDL_GetError());
+		goto done;
+	}
+
+	/* copy video image in texture */
+	sstride = buf->datas[0].chunk->stride;
+	if (sstride == 0)
+		sstride = buf->datas[0].chunk->size / data->position->video.size.height;
+
+	src = sdata;
+	dst = ddata;
+
+	for (i = 0; i < data->position->video.size.height; i++) {
+		struct pixel *p = (struct pixel *) src;
+		for (j = 0; j < data->position->video.size.width; j++) {
+			dst[j * 4 + 0] = SPA_CLAMP(p[j].r * 255.0f, 0, 255);
+			dst[j * 4 + 1] = SPA_CLAMP(p[j].g * 255.0f, 0, 255);
+			dst[j * 4 + 2] = SPA_CLAMP(p[j].b * 255.0f, 0, 255);
+			dst[j * 4 + 3] = SPA_CLAMP(p[j].a * 255.0f, 0, 255);
+		}
+		src += sstride;
+		dst += dstride;
+	}
+	SDL_UnlockTexture(data->texture);
+
+	SDL_RenderClear(data->renderer);
+	SDL_RenderCopy(data->renderer, data->texture, &data->rect, NULL);
+	SDL_RenderPresent(data->renderer);
+
+      done:
+	pw_filter_queue_buffer(data->in_port, b);
+}
+
+static void on_filter_state_changed(void *_data, enum pw_filter_state old,
+				    enum pw_filter_state state, const char *error)
+{
+	struct data *data = _data;
+	fprintf(stderr, "filter state: \"%s\"\n", pw_filter_state_as_string(state));
+	switch (state) {
+	case PW_FILTER_STATE_UNCONNECTED:
+		pw_main_loop_quit(data->loop);
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+on_filter_io_changed(void *_data, void *port_data, uint32_t id, void *area, uint32_t size)
+{
+	struct data *data = _data;
+
+	switch (id) {
+	case SPA_IO_Position:
+		data->position = area;
+		break;
+	}
+}
+
+static void
+on_filter_param_changed(void *_data, void *port_data, uint32_t id, const struct spa_pod *param)
+{
+	struct data *data = _data;
+	struct pw_filter *filter = data->filter;
+
+	/* NULL means to clear the format */
+	if (param == NULL || id != SPA_PARAM_Format)
+		return;
+
+	/* call a helper function to parse the format for us. */
+	spa_format_video_dsp_parse(param, &data->format);
+
+	if (data->format.format != SPA_VIDEO_FORMAT_RGBA_F32) {
+		pw_filter_set_error(filter, -EINVAL, "unknown format");
+		return;
+	}
+
+	data->texture = SDL_CreateTexture(data->renderer,
+					  SDL_PIXELFORMAT_RGBA32,
+					  SDL_TEXTUREACCESS_STREAMING,
+					  data->position->video.size.width,
+					  data->position->video.size.height);
+	if (data->texture == NULL) {
+		pw_filter_set_error(filter, -errno, "can't create texture");
+		return;
+	}
+
+	data->rect.x = 0;
+	data->rect.y = 0;
+	data->rect.w = data->position->video.size.width;
+	data->rect.h = data->position->video.size.height;
+}
+
+/* these are the filter events we listen for */
+static const struct pw_filter_events filter_events = {
+	PW_VERSION_FILTER_EVENTS,
+	.state_changed = on_filter_state_changed,
+	.io_changed = on_filter_io_changed,
+	.param_changed = on_filter_param_changed,
+	.process = on_process,
+};
+
+int main(int argc, char *argv[])
+{
+	struct data data = { 0, };
+
+	pw_init(&argc, &argv);
+
+	/* create a main loop */
+	data.loop = pw_main_loop_new(NULL);
+
+	data.target = argc > 1 ? argv[1] : NULL;
+
+	/* create a simple filter, the simple filter manages to core and remote
+	 * objects for you if you don't need to deal with them
+	 *
+	 * If you plan to autoconnect your filter, you need to provide at least
+	 * media, category and role properties
+	 *
+	 * Pass your events and a user_data pointer as the last arguments. This
+	 * will inform you about the filter state. The most important event
+	 * you need to listen to is the process event where you need to consume
+	 * the data provided to you.
+	 */
+	data.filter = pw_filter_new_simple(
+			pw_main_loop_get_loop(data.loop),
+			"video-dsp-play",
+			pw_properties_new(
+				PW_KEY_MEDIA_TYPE, "Video",
+				PW_KEY_MEDIA_CATEGORY, "Capture",
+				PW_KEY_MEDIA_ROLE, "DSP",
+				PW_KEY_NODE_AUTOCONNECT, data.target ? "true" : "false",
+				PW_KEY_TARGET_OBJECT, data.target,
+				PW_KEY_MEDIA_CLASS, "Stream/Input/Video",
+				NULL),
+			&filter_events,
+			&data);
+
+
+	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+		fprintf(stderr, "can't initialize SDL: %s\n", SDL_GetError());
+		return -1;
+	}
+
+	if (SDL_CreateWindowAndRenderer
+	    (WIDTH, HEIGHT, SDL_WINDOW_RESIZABLE, &data.window, &data.renderer)) {
+		fprintf(stderr, "can't create window: %s\n", SDL_GetError());
+		return -1;
+	}
+
+	/* Make a new DSP port. This will automatically set up the right
+	 * parameters for the port */
+	data.in_port = pw_filter_add_port(data.filter,
+			PW_DIRECTION_INPUT,
+			PW_FILTER_PORT_FLAG_MAP_BUFFERS,
+			0,
+			pw_properties_new(
+				PW_KEY_FORMAT_DSP, "32 bit float RGBA video",
+				PW_KEY_PORT_NAME, "input",
+				NULL),
+			NULL, 0);
+
+	pw_filter_connect(data.filter,
+			0,		/* no flags */
+			NULL, 0);
+
+	/* do things until we quit the mainloop */
+	pw_main_loop_run(data.loop);
+
+	pw_filter_destroy(data.filter);
+	pw_main_loop_destroy(data.loop);
+
+	SDL_DestroyTexture(data.texture);
+	if (data.cursor)
+		SDL_DestroyTexture(data.cursor);
+	SDL_DestroyRenderer(data.renderer);
+	SDL_DestroyWindow(data.window);
+
+	return 0;
+}