c/gst-basic-example/gst-basic-example.c

   1 /* gst-basic-example - basic example program for the GStreamer 1,0 API
   2  *
   3  * Copyright (C) 2013  Antonio Ospite <ospite@studenti.unina.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <gst/gst.h>
  20
  21 static gboolean on_message(GstBus *bus, GstMessage *message, gpointer user_data)
  22 {
  23         GMainLoop *loop = (GMainLoop *)user_data;
  24
  25         switch (GST_MESSAGE_TYPE(message)) {
  26         case GST_MESSAGE_ERROR:
  27                 g_error("Got ERROR");
  28                 g_main_loop_quit(loop);
  29                 break;
  30         case GST_MESSAGE_WARNING:
  31                 g_warning("Got WARNING");
  32                 g_main_loop_quit(loop);
  33                 break;
  34         case GST_MESSAGE_EOS:
  35                 g_main_loop_quit(loop);
  36                 break;
  37         default:
  38                 break;
  39         }
  40
  41         return TRUE;
  42 }
  43
  44 int main(void)
  45 {
  46         GstElement *pipeline, *src, *capsfilter, *conv, *sink;
  47         GstCaps *caps;
  48         GstBus *bus;
  49         GMainLoop *loop;
  50         int ret;
  51
  52         gst_init(NULL, NULL);
  53
  54         pipeline = gst_element_factory_make("pipeline", NULL);
  55
  56         src = gst_element_factory_make("videotestsrc", NULL);
  57
  58         caps = gst_caps_from_string("video/x-raw,format=AYUV,width=800,height=480");
  59
  60         capsfilter = gst_element_factory_make("capsfilter", NULL);
  61         g_object_set(G_OBJECT(capsfilter), "caps", caps, NULL);
  62
  63         conv = gst_element_factory_make("videoconvert", NULL);
  64
  65         sink = gst_element_factory_make("autovideosink", NULL);
  66         g_return_val_if_fail(sink != NULL, -1);
  67
  68         gst_bin_add_many(GST_BIN(pipeline), src, capsfilter, conv, sink, NULL);
  69         ret = gst_element_link_many(src, capsfilter, conv, sink, NULL);
  70         if (!ret) {
  71                 g_error("Failed to link elements");
  72                 return -2;
  73         }
  74
  75         loop = g_main_loop_new(NULL, FALSE);
  76
  77         bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
  78         gst_bus_add_signal_watch(bus);
  79         g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(on_message),
  80                          loop);
  81         gst_object_unref(GST_OBJECT(bus));
  82
  83         ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
  84         if (ret == GST_STATE_CHANGE_FAILURE) {
  85                 g_error("Failed to go into PLAYING state");
  86                 return -3;
  87         }
  88
  89         g_main_loop_run(loop);
  90
  91         gst_element_set_state(pipeline, GST_STATE_NULL);
  92
  93         g_main_loop_unref(loop);
  94         gst_object_unref(pipeline);
  95
  96         return 0;
  97 }