gtk-app.c

   1 /*
   2 initially based on an example by Tristan Matthews
   3 http://tristanswork.blogspot.com/2008/09/fullscreen-video-in-gstreamer-with-gtk.html
   4 */
   5 #include <gst/gst.h>
   6 #include <gtk/gtk.h>
   7 #include <gst/interfaces/xoverlay.h>
   8 #include <gdk/gdk.h>
   9 #include <gdk/gdkx.h>
  10 #include "gtk-app.h"
  11
  12
  13 static void hide_mouse(GtkWidget *widget){
  14   GdkWindow *w = GDK_WINDOW(widget->window);
  15   GdkDisplay *display = gdk_display_get_default();
  16   GdkCursor *cursor = gdk_cursor_new_for_display(display, GDK_BLANK_CURSOR);
  17   gdk_window_set_cursor(w, cursor);
  18   gdk_cursor_unref (cursor);
  19 }
  20
  21 static void
  22 post_tee_pipeline(GstPipeline *pipeline, GstElement *tee, GstElement *sink,
  23     int rngseed, int colour, int timer, int debug){
  24   GstElement *queue = gst_element_factory_make("queue", NULL);
  25   GstElement *sparrow = gst_element_factory_make("sparrow", NULL);
  26   GstElement *caps_posteriori = gst_element_factory_make("capsfilter", NULL);
  27   GstElement *cs_posteriori = gst_element_factory_make("ffmpegcolorspace", NULL);
  28
  29   g_object_set(G_OBJECT(caps_posteriori), "caps",
  30       gst_caps_new_simple ("video/x-raw-rgb",
  31           COMMON_CAPS), NULL);
  32
  33   g_object_set(G_OBJECT(sparrow),
  34       "timer", timer,
  35       "debug", debug,
  36       "rngseed", rngseed,
  37       "colour", colour,
  38       //"reload", "dumpfiles/gtk.dump",
  39       //"save", "dumpfiles/gtk.dump",
  40       NULL);
  41
  42   gst_bin_add_many (GST_BIN(pipeline),
  43       queue,
  44       sparrow,
  45       caps_posteriori,
  46       cs_posteriori,
  47       sink,
  48       NULL);
  49
  50   gst_element_link_many(tee,
  51       queue,
  52       sparrow,
  53       caps_posteriori,
  54       cs_posteriori,
  55       sink,
  56       NULL);
  57 }
  58
  59 static GstElement *
  60 pre_tee_pipeline(GstPipeline *pipeline){
  61   if (pipeline == NULL){
  62     pipeline = GST_PIPELINE(gst_pipeline_new("sparrow_pipeline"));
  63   }
  64   GstElement *src = gst_element_factory_make("v4l2src", NULL);
  65   GstElement *caps_priori = gst_element_factory_make("capsfilter", NULL);
  66   GstElement *cs_priori = gst_element_factory_make("ffmpegcolorspace", NULL);
  67   GstElement *caps_interiori = gst_element_factory_make("capsfilter", NULL);
  68   GstElement *tee = gst_element_factory_make ("tee", NULL);
  69
  70   g_object_set(G_OBJECT(caps_priori), "caps",
  71       gst_caps_new_simple ("video/x-raw-yuv",
  72           "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC('Y', 'U', 'Y', '2'),
  73           COMMON_CAPS), NULL);
  74
  75   g_object_set(G_OBJECT(caps_interiori), "caps",
  76       gst_caps_new_simple ("video/x-raw-rgb",
  77           COMMON_CAPS), NULL);
  78
  79   gst_bin_add_many(GST_BIN(pipeline),
  80       src,
  81       caps_priori,
  82       cs_priori,
  83       //caps_interiori,
  84       tee,
  85       NULL);
  86
  87   gst_element_link_many(src,
  88       caps_priori,
  89       cs_priori,
  90       //caps_interiori,
  91       tee,
  92       NULL);
  93   return tee;
  94 }
  95
  96
  97 static GstPipeline *
  98 make_multi_pipeline(windows_t *windows, int count)
  99 {
 100   GstPipeline *pipeline = GST_PIPELINE(gst_pipeline_new("sparrow_pipeline"));
 101   GstElement *tee = pre_tee_pipeline(pipeline);
 102
 103   int i;
 104   for (i = 0; i < count; i++){
 105     GstElement *sink = windows->sinks[i];
 106     //args are:
 107     //(pipeline, tee, sink, int rngseed, int colour, timer flag, int debug flag)
 108     /* timer should only run on one of them. colour >= 3 is undefined */
 109     int debug = option_debug && i == 0;
 110     post_tee_pipeline(pipeline, tee, sink, i, i + 1, i == 0, debug);
 111   }
 112   return pipeline;
 113 }
 114
 115
 116 static void
 117 bus_call(GstBus * bus, GstMessage *msg, gpointer data)
 118 {
 119   windows_t *windows = (windows_t *)data;
 120   if (GST_MESSAGE_TYPE(msg) == GST_MESSAGE_ELEMENT &&
 121       gst_structure_has_name(msg->structure, "prepare-xwindow-id")){
 122     g_print("Got prepare-xwindow-id msg. option screens: %d\n", option_screens);
 123     for (int i = 0; i < option_screens; i++){
 124       gst_x_overlay_set_xwindow_id(GST_X_OVERLAY(windows->sinks[i]),
 125           windows->xwindows[i]);
 126       g_print("connected sink %d to window %lu\n", i, windows->xwindows[i]);
 127       hide_mouse(windows->gtk_windows[i]);
 128     }
 129   }
 130 }
 131
 132 static void
 133 toggle_fullscreen(GtkWidget *widget){
 134   GdkWindowState state = gdk_window_get_state(GDK_WINDOW(widget->window));
 135   if (state == GDK_WINDOW_STATE_FULLSCREEN){
 136     gtk_window_unfullscreen(GTK_WINDOW(widget));
 137   }
 138   else{
 139     gtk_window_fullscreen(GTK_WINDOW(widget));
 140   }
 141 }
 142
 143 static gboolean
 144 key_press_event_cb(GtkWidget *widget, GdkEventKey *event, gpointer data)
 145 {
 146   g_print("got key %c\n", event->keyval);
 147   switch (event->keyval){
 148   case 'f':
 149     toggle_fullscreen(widget);
 150     break;
 151   case 'q':
 152     g_signal_emit_by_name(widget, "destroy");
 153     break;
 154   default:
 155     break;
 156   }
 157   return TRUE;
 158 }
 159
 160 void destroy_cb(GtkWidget * widget, gpointer data)
 161 {
 162   GMainLoop *loop = (GMainLoop*) data;
 163   g_print("Window destroyed\n");
 164   g_main_loop_quit(loop);
 165 }
 166
 167 static void
 168 video_widget_realize_cb(GtkWidget *widget, gpointer data)
 169 {
 170   windows_t *windows = (windows_t *)data;
 171   int r = windows->realised;
 172   if (r < MAX_SCREENS){
 173     windows->xwindows[r] = GDK_WINDOW_XID(GDK_WINDOW(widget->window));
 174     g_print("realised window %d with XID %lu\n", r, windows->xwindows[r]);
 175   }
 176   else {
 177     g_print("wtf, there seem to be %d windows!\n", r);
 178   }
 179   windows->realised++;
 180   hide_mouse(widget);
 181 }
 182
 183
 184 static void
 185 set_up_window(GMainLoop *loop, GtkWidget *window, int screen_no){
 186   static const GdkColor black = {0, 0, 0, 0};
 187   gtk_window_set_default_size(GTK_WINDOW(window), WIDTH, HEIGHT);
 188
 189   if (option_fullscreen){
 190     gtk_window_fullscreen(GTK_WINDOW(window));
 191   }
 192
 193   /*if more than one screen is requested, set the screen number.
 194     otherwise let it fall were it falls */
 195   if (option_screens > 1){
 196     /* "screen" is not the same thing as "monitor" */
 197     GdkScreen * screen = gdk_screen_get_default();
 198     int width = gdk_screen_get_width(screen);
 199     //int monitor = gdk_screen_get_monitor_at_point(screen,
 200     //    width / 2 + width * screen_no, 50);
 201     gtk_window_move(GTK_WINDOW(window), (width / 2 * screen_no + 50), 50);
 202
 203
 204     //GdkDisplay *display = gdk_display_get_default();
 205     //GdkScreen *screen = gdk_display_get_screen(display, screen_no);
 206     //gtk_window_set_screen(GTK_WINDOW(window), screen);
 207   }
 208
 209   // attach key press signal to key press callback
 210   gtk_widget_set_events(window, GDK_KEY_PRESS_MASK);
 211   g_signal_connect(G_OBJECT(window), "key-press-event", G_CALLBACK(key_press_event_cb), NULL);
 212   g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy_cb), loop);
 213
 214   gtk_widget_modify_bg(window, GTK_STATE_NORMAL, &black);
 215   gtk_widget_show_all(window);
 216   hide_mouse(window);
 217 }
 218
 219
 220 static GOptionEntry entries[] =
 221 {
 222   { "full-screen", 'f', 0, G_OPTION_ARG_NONE, &option_fullscreen, "run full screen", NULL },
 223   { "screens", 's', 2, G_OPTION_ARG_INT, &option_screens, "Use this many screens", "S" },
 224   { "debug", 'd', 2, G_OPTION_ARG_NONE, &option_debug, "Save debug images in /tmp", NULL },
 225   //  { "overlay", 'o', 0, G_OPTION_ARG_NONE, &option_overlay, "Use some kind of overlay", NULL },
 226   { NULL, 0, 0, 0, NULL, NULL, NULL }
 227 };
 228
 229
 230 gint main (gint argc, gchar *argv[])
 231 {
 232   //initialise threads before any gtk stuff (because not using gtk_init)
 233   g_thread_init(NULL);
 234   /*this is more complicated than plain gtk_init/gst_init, so that options from
 235     all over can be gathered and presented together.
 236    */
 237   GOptionGroup *gst_opts = gst_init_get_option_group();
 238   GOptionGroup *gtk_opts = gtk_get_option_group(TRUE);
 239   GOptionContext *ctx = g_option_context_new("...!");
 240   g_option_context_add_main_entries(ctx, entries, NULL);
 241   g_option_context_add_group(ctx, gst_opts);
 242   g_option_context_add_group(ctx, gtk_opts);
 243   GError *error = NULL;
 244   if (!g_option_context_parse(ctx, &argc, &argv, &error)){
 245     g_print ("Error initializing: %s\n", GST_STR_NULL(error->message));
 246     exit (1);
 247   }
 248   g_option_context_free(ctx);
 249
 250   GMainLoop *loop = g_main_loop_new(NULL, FALSE);
 251
 252   windows_t windows;
 253   windows.realised = 0;
 254
 255   int i;
 256   for (i = 0; i < option_screens; i++){
 257     GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 258     g_signal_connect(window, "realize",
 259         G_CALLBACK(video_widget_realize_cb), &windows);
 260     /* set up sink here */
 261     GstElement *sink = gst_element_factory_make("ximagesink", NULL);
 262     set_up_window(loop, window, i);
 263     windows.gtk_windows[i] = window;
 264     windows.sinks[i] = sink;
 265   }
 266
 267   GstElement *pipeline = (GstElement *)make_multi_pipeline(&windows, option_screens);
 268
 269   GstBus *bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
 270   gst_bus_add_watch(bus, (GstBusFunc)bus_call, &windows);
 271   gst_object_unref(bus);
 272
 273   gst_element_set_state(pipeline, GST_STATE_PLAYING);
 274
 275   g_main_loop_run(loop);
 276
 277   gst_element_set_state (pipeline, GST_STATE_NULL);
 278   gst_object_unref (pipeline);
 279   return 0;
 280 }