1 /* GStreamer
2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include <stdlib.h> /* exit */
24
25 #include <gst/gst.h>
26
27 static GMainLoop *loop;
28
29 static void
pad_added_cb(GstElement * element,GstPad * pad,GstElement * sink)30 pad_added_cb (GstElement * element, GstPad * pad, GstElement * sink)
31 {
32 g_print ("New pad...\n");
33 }
34
35 static void
no_more_pads(GstElement * element)36 no_more_pads (GstElement * element)
37 {
38 g_print ("No more pads...\n");
39 g_main_loop_quit (loop);
40 }
41
42 static gboolean
start_finding(GstElement * pipeline)43 start_finding (GstElement * pipeline)
44 {
45 GstStateChangeReturn res;
46
47 g_print ("finding caps...\n");
48 res = gst_element_set_state (pipeline, GST_STATE_PAUSED);
49 if (res == GST_STATE_CHANGE_FAILURE) {
50 g_print ("could not pause\n");
51 exit (-1);
52 }
53 return FALSE;
54 }
55
56 static void
dump_element_stats(GstElement * element)57 dump_element_stats (GstElement * element)
58 {
59 GstIterator *it;
60 GValue data = { 0, };
61
62 it = gst_element_iterate_src_pads (element);
63 while (gst_iterator_next (it, &data) == GST_ITERATOR_OK) {
64 GstPad *pad = g_value_get_object (&data);
65 GstCaps *caps;
66 gchar *str;
67 GstQuery *query;
68
69 g_print ("stream %s:\n", GST_OBJECT_NAME (pad));
70
71 caps = gst_pad_query_caps (pad, NULL);
72 str = gst_caps_to_string (caps);
73 g_print (" caps: %s\n", str);
74 g_free (str);
75 gst_caps_unref (caps);
76
77 query = gst_query_new_duration (GST_FORMAT_TIME);
78 if (gst_pad_query (pad, query)) {
79 gint64 duration;
80
81 gst_query_parse_duration (query, NULL, &duration);
82
83 g_print (" duration: %" GST_TIME_FORMAT "\n", GST_TIME_ARGS (duration));
84 }
85 gst_query_unref (query);
86
87 g_value_reset (&data);
88 }
89 g_value_unset (&data);
90 gst_iterator_free (it);
91 }
92
93 gint
main(gint argc,gchar * argv[])94 main (gint argc, gchar * argv[])
95 {
96 GstElement *pipeline, *filesrc, *decodebin;
97
98 gst_init (&argc, &argv);
99
100 pipeline = gst_pipeline_new ("pipeline");
101
102 filesrc = gst_element_factory_make ("filesrc", "filesrc");
103 g_assert (filesrc);
104
105 decodebin = gst_element_factory_make ("decodebin", "decodebin");
106 g_assert (decodebin);
107
108 g_signal_connect (G_OBJECT (decodebin), "pad-added",
109 G_CALLBACK (pad_added_cb), NULL);
110 g_signal_connect (G_OBJECT (decodebin), "no-more-pads",
111 G_CALLBACK (no_more_pads), NULL);
112
113 gst_bin_add_many (GST_BIN (pipeline), filesrc, decodebin, NULL);
114 gst_element_link (filesrc, decodebin);
115
116 if (argc < 2) {
117 g_print ("usage: %s <uri>\n", argv[0]);
118 exit (-1);
119 }
120
121 if (!g_str_has_prefix (argv[1], "file://")) {
122 g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
123 } else {
124 g_object_set (G_OBJECT (filesrc), "location", argv[1] + 7, NULL);
125 }
126
127 /* event based programming approach */
128 loop = g_main_loop_new (NULL, TRUE);
129 g_idle_add ((GSourceFunc) start_finding, pipeline);
130 g_main_loop_run (loop);
131
132 dump_element_stats (decodebin);
133
134 return 0;
135 }
136