Init waltham-receiver

Bug-AGL: SPEC-3605

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ia352702d0c43f1f2ccecbffea85f3d0f17f2fd56

1 files changed, 1012 insertions, 0 deletions

diff --git a/src/wth-receiver-gst-egl.c b/src/wth-receiver-gst-egl.c
new file mode 100644
index 0000000..0704e6b
--- /dev/null
+++ b/src/wth-receiver-gst-egl.c
@@ -0,0 +1,1012 @@
+/*
+ * Copyright © 2019 Advanced Driver Information Technology GmbH
+ * Copyright © 2020 Collabora, Ltd.
+ *
+ * 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.
+ */
+
+/*******************************************************************************
+ **                                                                              **
+ **  TARGET    : linux                                                           **
+ **                                                                              **
+ **  PROJECT   : waltham-receiver                                                **
+ **                                                                              **
+ **  PURPOSE   : This file is acts as interface to weston compositor at receiver **
+ **  side                                                                        **
+ **                                                                              **
+ *******************************************************************************/
+
+#define GST_USE_UNSTABLE_API
+
+#include <sys/mman.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <gst/gst.h>
+#include <gst/video/gstvideometa.h>
+#include <gst/allocators/gstdmabuf.h>
+#include <gst/app/gstappsink.h>
+#include <pthread.h>
+#include <gst/wayland/wayland.h>
+#include <gst/video/videooverlay.h>
+
+#include <GL/gl.h>
+#include <GLES/gl.h>
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include "xdg-shell-client-protocol.h"
+
+#include "wth-receiver-seat.h"
+#include "wth-receiver-comm.h"
+#include "os-compatibility.h"
+#include "bitmap.h"
+
+#define WINDOW_WIDTH_SIZE       800
+#define WINDOW_HEIGHT_SIZE      600
+
+#define PIPELINE_SIZE		4096
+
+static int running = 1;
+
+typedef struct _GstAppContext {
+	GMainLoop *loop;
+	GstBus *bus;
+
+	GstElement *pipeline;
+	GstElement *sink;
+
+	GstWaylandVideo *wl_video;
+	GstVideoOverlay *overlay;
+
+	struct display *display;
+	struct window *window;
+	GstVideoInfo info;
+
+} GstAppContext;
+
+static const gchar *vertex_shader_str =
+"attribute vec4 a_position;   \n"
+"attribute vec2 a_texCoord;   \n"
+"varying vec2 v_texCoord;     \n"
+"void main()                  \n"
+"{                            \n"
+"   gl_Position = a_position; \n"
+"   v_texCoord = a_texCoord;  \n"
+"}                            \n";
+
+static const gchar *fragment_shader_str =
+"#ifdef GL_ES                                          \n"
+"precision mediump float;                              \n"
+"#endif                                                \n"
+"varying vec2 v_texCoord;                              \n"
+"uniform sampler2D tex;                                \n"
+"void main()                                           \n"
+"{                                                     \n"
+"vec2 uv;                                              \n"
+"uv = v_texCoord.xy;                                   \n"
+"vec4 c = texture2D(tex, uv);                          \n"
+"gl_FragColor = c;                                     \n"
+"}                                                     \n";
+
+/*
+ * pointer callbcak functions
+ */
+static void
+pointer_handle_enter(void *data, struct wl_pointer *wl_pointer,
+		uint32_t serial, struct wl_surface *wl_surface,
+		wl_fixed_t sx, wl_fixed_t sy)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_pointer_enter(window, serial, sx, sy);
+}
+
+static void
+pointer_handle_leave(void *data, struct wl_pointer *pointer,
+		uint32_t serial, struct wl_surface *surface)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_pointer_leave(window, serial);
+
+}
+
+static void
+pointer_handle_motion(void *data, struct wl_pointer *pointer,
+		uint32_t time, wl_fixed_t sx, wl_fixed_t sy)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_pointer_motion(window, time, sx, sy);
+}
+
+static void
+pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
+		uint32_t serial, uint32_t time, uint32_t button,
+		uint32_t state)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_pointer_button(window, serial, time, button, state);
+}
+
+static void
+pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
+		uint32_t time, uint32_t axis, wl_fixed_t value)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_pointer_axis(window, time, axis, value);
+}
+
+static void
+pointer_handle_frame(void *data, struct wl_pointer *pointer)
+{
+	(void) data;
+	(void) pointer;
+}
+
+static void
+pointer_handle_axis_source(void *data, struct wl_pointer *pointer,
+		uint32_t source)
+{
+	(void) data;
+	(void) pointer;
+	(void) source;
+}
+
+static void
+pointer_handle_axis_stop(void *data, struct wl_pointer *pointer,
+		uint32_t time, uint32_t axis)
+{
+	(void) data;
+	(void) pointer;
+	(void) time;
+	(void) axis;
+}
+
+static void
+pointer_handle_axis_discrete(void *data, struct wl_pointer *pointer,
+		uint32_t axis, int32_t discrete)
+{
+	(void) data;
+	(void) pointer;
+	(void) axis;
+	(void) discrete;
+}
+
+static const struct wl_pointer_listener pointer_listener = {
+	pointer_handle_enter,
+	pointer_handle_leave,
+	pointer_handle_motion,
+	pointer_handle_button,
+	pointer_handle_axis,
+	pointer_handle_frame,
+	pointer_handle_axis_source,
+	pointer_handle_axis_stop,
+	pointer_handle_axis_discrete
+};
+
+/*
+ * touch callbcak functions
+ */
+
+static void
+touch_handle_down(void *data, struct wl_touch *touch, uint32_t serial,
+		uint32_t time, struct wl_surface *surface, int32_t id,
+		wl_fixed_t x_w, wl_fixed_t y_w)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_touch_down(window, serial, time, id, x_w, y_w);
+}
+
+static void
+touch_handle_up(void *data, struct wl_touch *touch, uint32_t serial,
+		uint32_t time, int32_t id)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_touch_up(window, serial, time, id);
+}
+
+static void
+touch_handle_motion(void *data, struct wl_touch *touch, uint32_t time,
+		int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_touch_motion(window, time, id, x_w, y_w);
+}
+
+static void
+touch_handle_frame(void *data, struct wl_touch *touch)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_touch_frame(window);
+}
+
+static void
+touch_handle_cancel(void *data, struct wl_touch *touch)
+{
+	struct display *display = data;
+	struct window *window = display->window;
+
+	waltham_touch_cancel(window);
+}
+
+static void
+touch_handle_shape(void *data, struct wl_touch *touch,
+		int32_t id, wl_fixed_t maj, wl_fixed_t min)
+{
+	(void) data;
+	(void) touch;
+
+	(void) id;
+	(void) maj;
+	(void) min;
+}
+
+static void
+touch_handle_orientation(void *data, struct wl_touch *touch, int32_t id, wl_fixed_t orientation)
+{
+	(void) data;
+	(void) touch;
+
+	(void) id;
+	(void) orientation;
+}
+
+static const struct wl_touch_listener touch_listener = {
+	touch_handle_down,
+	touch_handle_up,
+	touch_handle_motion,
+	touch_handle_frame,
+	touch_handle_cancel,
+	touch_handle_shape,
+	touch_handle_orientation,
+};
+
+static void
+xdg_wm_base_ping(void *data, struct xdg_wm_base *shell, uint32_t serial)
+{
+	xdg_wm_base_pong(shell, serial);
+}
+
+static const struct xdg_wm_base_listener xdg_wm_base_listener = {
+	xdg_wm_base_ping,
+};
+
+
+/*
+ * seat callback
+ */
+static void
+seat_capabilities(void *data, struct wl_seat *wl_seat, enum wl_seat_capability caps)
+{
+	struct display *display = data;
+
+	if ((caps & WL_SEAT_CAPABILITY_POINTER) && !display->wl_pointer) {
+		display->wl_pointer = wl_seat_get_pointer(wl_seat);
+		wl_pointer_set_user_data(display->wl_pointer, display);
+		wl_pointer_add_listener(display->wl_pointer, &pointer_listener, display);
+		wl_display_roundtrip(display->display);
+	} else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && display->wl_pointer) {
+		wl_pointer_destroy(display->wl_pointer);
+		display->wl_pointer = NULL;
+	}
+
+	if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !display->wl_touch) {
+		display->wl_touch = wl_seat_get_touch(wl_seat);
+		wl_touch_set_user_data(display->wl_touch, display);
+		wl_touch_add_listener(display->wl_touch, &touch_listener, display);
+		wl_display_roundtrip(display->display);
+	} else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && display->wl_touch) {
+		wl_touch_destroy(display->wl_touch);
+		display->wl_touch = NULL;
+	}
+}
+
+static const struct wl_seat_listener seat_listener = {
+	seat_capabilities,
+	NULL
+};
+
+static void
+add_seat(struct display *display, uint32_t id, uint32_t version)
+{
+	display->wl_pointer = NULL;
+	display->wl_touch = NULL;
+	display->wl_keyboard = NULL;
+	display->seat = wl_registry_bind(display->registry, id,
+			&wl_seat_interface, 1);
+	wl_seat_add_listener(display->seat, &seat_listener, display);
+}
+
+/*
+ *  registry callback
+ */
+static void
+registry_handle_global(void *data, struct wl_registry *registry,
+		uint32_t id, const char *interface, uint32_t version)
+{
+	struct display *d = data;
+
+	if (strcmp(interface, "wl_compositor") == 0) {
+		d->compositor = wl_registry_bind(registry,
+					 id, &wl_compositor_interface, 1);
+	} else if (strcmp(interface, "wl_seat") == 0) {
+		add_seat(d, id, version);
+	} else if (strcmp(interface, "xdg_wm_base") == 0) {
+		d->wm_base = wl_registry_bind(registry, id,
+				&xdg_wm_base_interface, 1);
+		xdg_wm_base_add_listener(d->wm_base, &xdg_wm_base_listener, d);
+	}
+}
+
+static void
+registry_handle_global_remove(void *data, struct wl_registry *registry,
+		uint32_t name)
+{
+	/* stub */
+}
+
+static const struct wl_registry_listener registry_listener = {
+	registry_handle_global,
+	registry_handle_global_remove
+};
+
+
+static struct display *
+create_display(void)
+{
+	struct display *display;
+
+	display = malloc(sizeof *display);
+	if (display == NULL) {
+		wth_error("out of memory\n");
+		exit(1);
+	}
+	display->display = wl_display_connect(NULL);
+	assert(display->display);
+
+	display->has_xrgb = false;
+	display->registry = wl_display_get_registry(display->display);
+	wl_registry_add_listener(display->registry,
+			&registry_listener, display);
+
+	wl_display_roundtrip(display->display);
+
+	return display;
+}
+
+static void
+destroy_display(struct display *display)
+{
+	if (display->compositor)
+		wl_compositor_destroy(display->compositor);
+
+	wl_registry_destroy(display->registry);
+	wl_display_flush(display->display);
+	wl_display_disconnect(display->display);
+	free(display);
+}
+
+static bool
+wth_check_egl_extension(const char *extensions, const char *extension)
+{
+	size_t extlen = strlen(extension);
+	const char *end = extensions + strlen(extensions);
+
+	while (extensions < end) {
+		size_t n = 0;
+
+		/* Skip whitespaces, if any */
+		if (*extensions == ' ') {
+			extensions++;
+			continue;
+		}
+
+		n = strcspn(extensions, " ");
+
+		/* Compare strings */
+		if (n == extlen && strncmp(extension, extensions, n) == 0)
+			return true; /* Found */
+
+		extensions += n;
+	}
+
+	/* Not found */
+	return false;
+}
+
+static inline void *
+wth_get_egl_proc_address(const char *address)
+{
+	const char *extensions = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS); 
+
+	if (extensions &&
+	    (wth_check_egl_extension(extensions, "EGL_EXT_platform_wayland") ||
+	     wth_check_egl_extension(extensions, "EGL_KHR_platform_wayland"))) {
+		return (void *) eglGetProcAddress(address);
+	}
+
+	return NULL;
+}
+
+static inline EGLDisplay
+wth_get_egl_display(EGLenum platform, void *native_display,
+			     const EGLint *attrib_list)
+{
+	static PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display = NULL;
+
+	if (!get_platform_display) {
+		get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
+			wth_get_egl_proc_address("eglGetPlatformDisplayEXT");
+	}
+
+	if (get_platform_display)
+		return get_platform_display(platform, native_display, attrib_list);
+
+	/* FIXME: no fall-through using eglGetDisplay() */
+	return NULL;
+}
+
+static void
+init_egl(struct display *display)
+{
+	EGLint config_attribs[] = {
+		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+		EGL_RED_SIZE, 8,
+		EGL_GREEN_SIZE, 8,
+		EGL_BLUE_SIZE, 8,
+		EGL_ALPHA_SIZE, 8,
+		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+		EGL_NONE
+	};
+
+	static const EGLint context_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+
+	EGLint major, minor, count;
+	EGLBoolean ret;
+
+	display->egl.dpy = wth_get_egl_display(EGL_PLATFORM_WAYLAND_KHR,
+					       display->display, NULL);
+	assert(display->egl.dpy);
+
+	ret = eglInitialize(display->egl.dpy, &major, &minor);
+	assert(ret == EGL_TRUE);
+	ret = eglBindAPI(EGL_OPENGL_ES_API);
+	assert(ret == EGL_TRUE);
+
+	ret = eglChooseConfig(display->egl.dpy, config_attribs,
+			&display->egl.conf, 1, &count);
+	assert(ret && count >= 1);
+
+	display->egl.ctx = eglCreateContext(display->egl.dpy,
+			display->egl.conf,
+			EGL_NO_CONTEXT, context_attribs);
+	assert(display->egl.ctx);
+
+	eglSwapInterval(display->egl.dpy, 1);
+
+	display->egl.create_image =
+		(void *) eglGetProcAddress("eglCreateImageKHR");
+	assert(display->egl.create_image);
+
+	display->egl.image_texture_2d =
+		(void *) eglGetProcAddress("glEGLImageTargetTexture2DOES");
+	assert(display->egl.image_texture_2d);
+
+	display->egl.destroy_image =
+		(void *) eglGetProcAddress("eglDestroyImageKHR");
+	assert(display->egl.destroy_image);
+	
+}
+
+GLuint load_shader(GLenum type, const char *shaderSrc)
+{
+	
+	GLuint shader;
+	GLint compiled;
+
+	/* Create the shader object */
+	shader = glCreateShader(type);
+	if (shader == 0)
+	{
+		printf("\n Failed to create shader \n");
+		return 0;
+	}
+	/* Load the shader source */
+	glShaderSource(shader, 1, &shaderSrc, NULL);
+	/* Compile the shader */
+	glCompileShader(shader);
+	/* Check the compile status */
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
+	if (!compiled)
+	{
+		GLint infoLen = 0;
+		glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
+		if (infoLen > 1)
+		{
+			char* infoLog = (char*)malloc (sizeof(char) * infoLen );
+			glGetShaderInfoLog(shader, infoLen, NULL, infoLog);
+			fprintf(stderr, "Error compiling shader:%s\n",infoLog);
+			free(infoLog);
+		}
+		glDeleteShader(shader);
+		return 0;
+	}
+	return shader;
+}
+
+void init_gl(struct display *display)
+{
+
+	GLint linked;
+
+	/* load vertext/fragment shader */
+	display->gl.vertex_shader = load_shader(GL_VERTEX_SHADER, vertex_shader_str);
+	display->gl.fragment_shader = load_shader(GL_FRAGMENT_SHADER, fragment_shader_str);
+
+	/* Create the program object */
+	display->gl.program_object = glCreateProgram();
+	if (display->gl.program_object == 0)
+	{
+		fprintf(stderr, "error program object\n");
+		return;
+	}
+
+	glAttachShader(display->gl.program_object, display->gl.vertex_shader);
+	glAttachShader(display->gl.program_object, display->gl.fragment_shader);
+	/* Bind vPosition to attribute 0 */
+	glBindAttribLocation(display->gl.program_object, 0, "a_position");
+	/* Link the program */
+	glLinkProgram(display->gl.program_object);
+	/* Check the link status */
+	glGetProgramiv(display->gl.program_object, GL_LINK_STATUS, &linked);
+	if (!linked)
+	{
+		GLint infoLen = 0;
+		glGetProgramiv(display->gl.program_object, GL_INFO_LOG_LENGTH, &infoLen);
+		if (infoLen > 1)
+		{
+			char* infoLog = (char*)malloc(sizeof(char) * infoLen);
+			glGetProgramInfoLog(display->gl.program_object, infoLen, NULL, infoLog);
+			fprintf(stderr, "Error linking program:%s\n", infoLog);
+			free(infoLog);
+		}
+		glDeleteProgram(display->gl.program_object);
+	}
+
+	glGenTextures(1, &display->gl.texture);
+
+	return;
+}
+
+static void
+handle_xdg_toplevel_configure(void *data, struct xdg_toplevel *xdg_toplevel,
+			      int32_t width, int32_t height, struct wl_array *states)
+{
+	struct window *window = data;
+	uint32_t *p;
+
+	window->fullscreen = 0;
+	window->maximized = 0;
+
+	wl_array_for_each(p, states) {
+		uint32_t state = *p;
+		switch (state) {
+			case XDG_TOPLEVEL_STATE_FULLSCREEN:
+				window->fullscreen = 1;
+				break;
+			case XDG_TOPLEVEL_STATE_MAXIMIZED:
+				window->maximized = 1;
+				break;
+		}
+	}
+
+	fprintf(stdout, "Got handle_xdg_toplevel_configure() "
+			"width %d, height %d, full %d, max %d\n", width, height,
+			window->fullscreen, window->maximized);
+
+	if (width > 0 && height > 0) {
+		if (!window->fullscreen && !window->maximized) {
+			window->width = width;
+			window->height = height;
+		}
+		window->width = width;
+		window->height = height;
+	} else if (!window->fullscreen && !window->maximized) {
+		if (width == 0)
+			window->width = WINDOW_WIDTH_SIZE;
+		else
+			window->width = width;
+
+		if (height == 0)
+			window->height = WINDOW_HEIGHT_SIZE;
+		else
+			window->height = height;
+	}
+
+	fprintf(stdout, "settting width %d, height %d\n", window->width,
+				window->height);
+
+	if (window->native) {
+		fprintf(stdout, "wayland-egl to resize to %dx%d\n", window->width, window->height);
+		wl_egl_window_resize(window->native, window->width,
+				     window->height, 0, 0);
+	}
+}
+
+
+static void
+handle_xdg_toplevel_close(void *data, struct xdg_toplevel *xdg_toplevel)
+{
+	running = 0;
+}
+
+static const struct xdg_toplevel_listener xdg_toplevel_listener = {
+	handle_xdg_toplevel_configure,
+	handle_xdg_toplevel_close,
+};
+
+static inline EGLSurface
+wth_create_egl_surface(EGLDisplay dpy, EGLConfig config,
+			void *native_window, const EGLint *attrib_list)
+{
+	static PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC
+					create_platform_window = NULL;
+
+	if (!create_platform_window) {
+		create_platform_window = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
+			wth_get_egl_proc_address("eglCreatePlatformWindowSurfaceEXT");
+	}
+
+	if (create_platform_window)
+		return create_platform_window(dpy, config,
+					      native_window, attrib_list);
+
+	return eglCreateWindowSurface(dpy, config,
+				      (EGLNativeWindowType) native_window,
+				      attrib_list);
+}
+
+static inline EGLBoolean
+wth_destroy_egl_surface(EGLDisplay display, EGLSurface surface)
+{
+	return eglDestroySurface(display, surface);
+}
+
+void
+redraw(struct window *window)
+{
+	struct wl_region *region;
+	struct display *display = window->display;
+
+	if (window->opaque || window->fullscreen) {
+		region = wl_compositor_create_region(window->display->compositor);
+		wl_region_add(region, 0, 0,
+				window->width,
+				window->height);
+		wl_surface_set_opaque_region(window->surface, region);
+		wl_region_destroy(region);
+	} else {
+		wl_surface_set_opaque_region(window->surface, NULL);
+	}
+
+	fprintf(stdout, "Doing a redraw\n");
+	eglSwapBuffers(display->egl.dpy, window->egl_surface);
+}
+
+static void
+handle_xdg_surface_configure(void *data, struct xdg_surface *surface, uint32_t serial)
+{
+	struct window *window = data;
+
+	fprintf(stderr, "Sending configure ack\n");
+	xdg_surface_ack_configure(surface, serial);
+	window->wait_for_configure = false;
+}
+
+static const struct xdg_surface_listener xdg_surface_listener = {
+	handle_xdg_surface_configure,
+};
+
+
+static void
+create_surface(struct window *window)
+{
+	
+	struct display *display = window->display;
+	int ret;
+
+	window->surface = wl_compositor_create_surface(display->compositor);
+	assert(window->surface);
+
+	window->native = wl_egl_window_create(window->surface,
+					      window->width, window->height);
+	assert(window->native);
+
+	window->egl_surface = wth_create_egl_surface(display->egl.dpy,
+						     display->egl.conf,
+						     window->native, NULL);
+
+	wl_display_roundtrip(display->display);
+
+	if (display->wm_base) {
+		window->xdg_surface =
+			xdg_wm_base_get_xdg_surface(display->wm_base, window->surface);
+		assert(window->xdg_surface);
+
+		xdg_surface_add_listener(window->xdg_surface,
+					 &xdg_surface_listener, window);
+		window->xdg_toplevel = xdg_surface_get_toplevel(window->xdg_surface);
+		assert(window->xdg_toplevel);
+
+		xdg_toplevel_add_listener(window->xdg_toplevel,
+					  &xdg_toplevel_listener, window);
+
+		if (window->app_id)
+			xdg_toplevel_set_app_id(window->xdg_toplevel, window->app_id);
+
+		wl_surface_commit(window->surface);
+		window->wait_for_configure = true;
+	}
+
+
+	ret = eglMakeCurrent(display->egl.dpy, window->egl_surface,
+			     window->egl_surface, display->egl.ctx);
+	assert(ret == EGL_TRUE);
+
+	if (!window->frame_sync)
+		eglSwapInterval(display->egl.dpy, 0);
+
+	glClearColor(0.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+}
+
+static void
+create_window(struct window *window, struct display *display, int width, int height, const char *app_id)
+{
+	window->callback = NULL;
+	window->display = display;
+	window->width = width;
+	window->height = height;
+	window->window_frames = 0;
+	window->window_benchmark_time = 0;
+	window->app_id = app_id;
+	window->frame_sync = 1;
+
+	create_surface(window);
+
+	return;
+}
+
+static void
+destroy_window(struct window *window)
+{
+	
+
+	if (window->callback)
+		wl_callback_destroy(window->callback);
+
+	if (window->xdg_toplevel)
+		xdg_toplevel_destroy(window->xdg_toplevel);
+
+	if (window->xdg_surface)
+		xdg_surface_destroy(window->xdg_surface);
+
+
+	wl_surface_destroy(window->surface);
+	free(window);
+
+	
+}
+
+static void
+signal_int(int signum)
+{
+	running = 0;
+}
+
+
+static void
+error_cb(GstBus *bus, GstMessage *msg, gpointer user_data)
+{
+	GstAppContext *d = user_data;
+
+	gchar *debug = NULL;
+	GError *err = NULL;
+
+	gst_message_parse_error(msg, &err, &debug);
+
+	g_print("Error: %s\n", err->message);
+	g_error_free(err);
+
+	if (debug) {
+		g_print("Debug details: %s\n", debug);
+		g_free(debug);
+	}
+
+	gst_element_set_state(d->pipeline, GST_STATE_NULL);
+}
+
+static GstBusSyncReply
+bus_sync_handler(GstBus *bus, GstMessage *message, gpointer user_data)
+{
+	GstAppContext *d = user_data;
+
+	fprintf(stdout, "entering bus_sync_handler()  setting it\n");
+
+	if (gst_is_wayland_display_handle_need_context_message(message)) {
+		GstContext *context;
+		struct wl_display *display_handle = d->display->display;
+
+		context = gst_wayland_display_handle_context_new(display_handle);
+		d->wl_video = GST_WAYLAND_VIDEO(GST_MESSAGE_SRC(message));
+		gst_element_set_context(GST_ELEMENT(GST_MESSAGE_SRC(message)), context);
+
+		fprintf(stdout, "bus_sync_handler(): creating context and setting it\n");
+
+		goto drop;
+	} else if (gst_is_video_overlay_prepare_window_handle_message(message)) {
+		struct wl_surface *window_handle = d->window->surface;
+
+		/* GST_MESSAGE_SRC(message) will be the overlay object that we
+		 * have to use. This may be waylandsink, but it may also be
+		 * playbin. In the latter case, we must make sure to use
+		 * playbin instead of waylandsink, because playbin resets the
+		 * window handle and render_rectangle after restarting playback
+		 * and the actual window size is lost */
+		d->overlay = GST_VIDEO_OVERLAY(GST_MESSAGE_SRC(message));
+
+		g_print("setting window handle and size (%d x %d) w %d, h %d\n",
+				d->window->x, d->window->y,
+				d->window->width, d->window->height);
+
+		gst_video_overlay_set_window_handle(d->overlay, (guintptr) window_handle);
+		gst_video_overlay_set_render_rectangle(d->overlay,
+				d->window->x, d->window->y,
+				d->window->width, d->window->height);
+
+		goto drop;
+	}
+
+	return GST_BUS_PASS;
+
+drop:
+	gst_message_unref(message);
+	return GST_BUS_DROP;
+}
+
+
+/**
+ * wth_receiver_weston_main
+ *
+ * This is the main function which will handle connection to the compositor at
+ * receiver side
+ *
+ * @param names        void *data
+ * @param value        struct window data
+ * @return             0 on success, -1 on error
+ */
+int
+wth_receiver_weston_main(struct window *window, const char *app_id, int port)
+{
+	struct sigaction sigint;
+	GstAppContext gstctx;
+	int ret = 0;
+	GError *gerror = NULL;
+	char pipeline[PIPELINE_SIZE];
+
+	memset(&gstctx, 0, sizeof(gstctx));
+
+	sigint.sa_handler = signal_int;
+	sigemptyset(&sigint.sa_mask);
+	sigint.sa_flags = SA_RESETHAND;
+	sigaction(SIGINT, &sigint, NULL);
+
+	/* Initialization for window creation */
+	gstctx.display = create_display();
+	init_egl(gstctx.display);
+
+	/* ToDo: fix the hardcoded value of width, height */
+	create_window(window, gstctx.display, WINDOW_WIDTH_SIZE,
+		      WINDOW_HEIGHT_SIZE, app_id);
+	init_gl(gstctx.display);
+
+	gstctx.window = window;
+	gstctx.display->window = window;
+
+	fprintf(stderr, "display %p\n", gstctx.display);
+	fprintf(stderr, "display->window %p\n", gstctx.display->window);
+	fprintf(stderr, "window %p\n", window);
+
+	int gargc = 2;
+	char **gargv = (char**) malloc(2 * sizeof(char*));
+
+	gargv[0] = strdup("waltham-receiver");
+	gargv[1] = strdup("--gst-debug-level=2");
+
+	/* create gstreamer pipeline */
+	gst_init(&gargc, &gargv);
+
+	const char *pipe = "rtpbin name=rtpbin udpsrc "
+		"caps=\"application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=JPEG,payload=26\" "
+		"port=%d ! rtpbin.recv_rtp_sink_0 rtpbin. ! "
+		"rtpjpegdepay ! jpegdec ! waylandsink";
+
+	memset(pipeline, 0x00, sizeof(pipeline));
+	snprintf(pipeline, sizeof(pipeline), pipe, port);
+
+	fprintf(stdout, "pipeline %s\n", pipeline);
+
+	/* parse the pipeline */
+	gstctx.pipeline = gst_parse_launch(pipeline, &gerror);
+	if (!gstctx.pipeline) {
+		fprintf(stderr, "Could not create gstreamer pipeline.\n");
+		destroy_display(gstctx.display);
+		return -1;
+	}
+
+	gstctx.bus = gst_element_get_bus(gstctx.pipeline);
+	gst_bus_add_signal_watch(gstctx.bus);
+
+	g_signal_connect(gstctx.bus, "message::error", G_CALLBACK(error_cb), &gstctx);
+	gst_bus_set_sync_handler(gstctx.bus, bus_sync_handler, &gstctx, NULL);
+	gst_object_unref(gstctx.bus);
+
+	gst_element_set_state(gstctx.pipeline, GST_STATE_PLAYING);
+
+	while (running && ret != -1) {
+		if (window->wait_for_configure) {
+			ret = wl_display_dispatch(gstctx.display->display);
+		} else {
+			ret = wl_display_dispatch_pending(gstctx.display->display);
+			redraw(window);
+		}
+	}
+
+	gst_element_set_state(gstctx.pipeline, GST_STATE_NULL);
+
+	destroy_window(window);
+	destroy_display(gstctx.display);
+	gst_object_unref(gstctx.pipeline);
+
+	return 0;
+}