2 * (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
3 * (c) 2006 Jan Schmidt <thaytan@noraisin.net>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library 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 GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
22 * SECTION:element-autovideosink
23 * @see_also: autoaudiosink, ximagesink, xvimagesink, sdlvideosink
25 * autovideosink is a video sink that automatically detects an appropriate
26 * video sink to use. It does so by scanning the registry for all elements
27 * that have <quote>Sink</quote> and <quote>Video</quote> in the class field
28 * of their element information, and also have a non-zero autoplugging rank.
31 * <title>Example launch line</title>
33 * gst-launch -v -m videotestsrc ! autovideosink
44 #include "gstautovideosink.h"
45 #include "gstautodetect.h"
54 static GstStateChangeReturn
55 gst_auto_video_sink_change_state (GstElement * element,
56 GstStateChange transition);
57 static void gst_auto_video_sink_dispose (GstAutoVideoSink * sink);
58 static void gst_auto_video_sink_clear_kid (GstAutoVideoSink * sink);
60 static void gst_auto_video_sink_set_property (GObject * object, guint prop_id,
61 const GValue * value, GParamSpec * pspec);
62 static void gst_auto_video_sink_get_property (GObject * object, guint prop_id,
63 GValue * value, GParamSpec * pspec);
65 GST_BOILERPLATE (GstAutoVideoSink, gst_auto_video_sink, GstBin, GST_TYPE_BIN);
67 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
73 gst_auto_video_sink_base_init (gpointer klass)
75 GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
77 gst_element_class_add_static_pad_template (eklass, &sink_template);
78 gst_element_class_set_details_simple (eklass, "Auto video sink",
80 "Wrapper video sink for automatically detected video sink",
81 "Jan Schmidt <thaytan@noraisin.net>");
85 gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass)
87 GObjectClass *gobject_class;
88 GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
90 gobject_class = G_OBJECT_CLASS (klass);
91 gobject_class->dispose = (GObjectFinalizeFunc) gst_auto_video_sink_dispose;
92 gobject_class->set_property = gst_auto_video_sink_set_property;
93 gobject_class->get_property = gst_auto_video_sink_get_property;
95 eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_video_sink_change_state);
97 * GstAutoVideoSink:filter-caps
99 * This property will filter out candidate sinks that can handle the specified
100 * caps. By default only video sinks that support raw rgb and yuv video
103 * This property can only be set before the element goes to the READY state.
107 g_object_class_install_property (gobject_class, PROP_CAPS,
108 g_param_spec_boxed ("filter-caps", "Filter caps",
109 "Filter sink candidates using these caps.", GST_TYPE_CAPS,
110 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
114 gst_auto_video_sink_dispose (GstAutoVideoSink * sink)
116 gst_auto_video_sink_clear_kid (sink);
118 if (sink->filter_caps)
119 gst_caps_unref (sink->filter_caps);
120 sink->filter_caps = NULL;
122 G_OBJECT_CLASS (parent_class)->dispose ((GObject *) sink);
126 gst_auto_video_sink_clear_kid (GstAutoVideoSink * sink)
129 gst_element_set_state (sink->kid, GST_STATE_NULL);
130 gst_bin_remove (GST_BIN (sink), sink->kid);
132 /* Don't lose the SINK flag */
133 GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
138 * Hack to make initial linking work; ideally, this'd work even when
139 * no target has been assigned to the ghostpad yet.
143 gst_auto_video_sink_reset (GstAutoVideoSink * sink)
147 /* Remove any existing element */
148 gst_auto_video_sink_clear_kid (sink);
150 /* fakesink placeholder */
151 sink->kid = gst_element_factory_make ("fakesink", "tempsink");
152 gst_bin_add (GST_BIN (sink), sink->kid);
154 /* pad, setting this target should always work */
155 targetpad = gst_element_get_static_pad (sink->kid, "sink");
156 gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad);
157 gst_object_unref (targetpad);
160 static GstStaticCaps raw_caps =
161 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb");
164 gst_auto_video_sink_init (GstAutoVideoSink * sink,
165 GstAutoVideoSinkClass * g_class)
167 sink->pad = gst_ghost_pad_new_no_target ("sink", GST_PAD_SINK);
168 gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
170 gst_auto_video_sink_reset (sink);
172 /* set the default raw video caps */
173 sink->filter_caps = gst_static_caps_get (&raw_caps);
176 GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
180 gst_auto_video_sink_factory_filter (GstPluginFeature * feature, gpointer data)
185 /* we only care about element factories */
186 if (!GST_IS_ELEMENT_FACTORY (feature))
190 klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
191 if (!(strstr (klass, "Sink") && strstr (klass, "Video")))
194 /* only select elements with autoplugging rank */
195 rank = gst_plugin_feature_get_rank (feature);
196 if (rank < GST_RANK_MARGINAL)
203 gst_auto_video_sink_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
207 diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
210 return strcmp (gst_plugin_feature_get_name (f2),
211 gst_plugin_feature_get_name (f1));
215 gst_auto_video_sink_create_element_with_pretty_name (GstAutoVideoSink * sink,
216 GstElementFactory * factory)
219 gchar *name, *marker;
221 marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name);
222 if (g_str_has_suffix (marker, "sink"))
223 marker[strlen (marker) - 4] = '\0';
224 if (g_str_has_prefix (marker, "gst"))
225 g_memmove (marker, marker + 3, strlen (marker + 3) + 1);
226 name = g_strdup_printf ("%s-actual-sink-%s", GST_OBJECT_NAME (sink), marker);
229 element = gst_element_factory_create (factory, name);
236 gst_auto_video_sink_find_best (GstAutoVideoSink * sink)
239 GstElement *choice = NULL;
240 GstMessage *message = NULL;
241 GSList *errors = NULL;
242 GstBus *bus = gst_bus_new ();
243 GstPad *el_pad = NULL;
244 GstCaps *el_caps = NULL;
245 gboolean no_match = TRUE;
247 list = gst_registry_feature_filter (gst_registry_get_default (),
248 (GstPluginFeatureFilter) gst_auto_video_sink_factory_filter, FALSE, sink);
249 list = g_list_sort (list, (GCompareFunc) gst_auto_video_sink_compare_ranks);
251 GST_LOG_OBJECT (sink, "Trying to find usable video devices ...");
253 for (item = list; item != NULL; item = item->next) {
254 GstElementFactory *f = GST_ELEMENT_FACTORY (item->data);
257 if ((el = gst_auto_video_sink_create_element_with_pretty_name (sink, f))) {
258 GstStateChangeReturn ret;
260 GST_DEBUG_OBJECT (sink, "Testing %s", GST_PLUGIN_FEATURE (f)->name);
262 /* If autovideosink has been provided with filter caps,
263 * accept only sinks that match with the filter caps */
264 if (sink->filter_caps) {
265 el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "sink");
266 el_caps = gst_pad_get_caps (el_pad);
267 gst_object_unref (el_pad);
268 GST_DEBUG_OBJECT (sink,
269 "Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT,
270 sink->filter_caps, el_caps);
271 no_match = !gst_caps_can_intersect (sink->filter_caps, el_caps);
272 gst_caps_unref (el_caps);
275 GST_DEBUG_OBJECT (sink, "Incompatible caps");
276 gst_object_unref (el);
279 GST_DEBUG_OBJECT (sink, "Found compatible caps");
283 gst_element_set_bus (el, bus);
284 ret = gst_element_set_state (el, GST_STATE_READY);
285 if (ret == GST_STATE_CHANGE_SUCCESS) {
286 GST_DEBUG_OBJECT (sink, "This worked!");
291 /* collect all error messages */
292 while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) {
293 GST_DEBUG_OBJECT (sink, "error message %" GST_PTR_FORMAT, message);
294 errors = g_slist_append (errors, message);
297 gst_element_set_state (el, GST_STATE_NULL);
298 gst_object_unref (el);
302 GST_DEBUG_OBJECT (sink, "done trying");
305 /* FIXME: we forward the first error for now; but later on it might make
306 * sense to actually analyse them */
307 gst_message_ref (GST_MESSAGE (errors->data));
308 GST_DEBUG_OBJECT (sink, "reposting message %p", errors->data);
309 gst_element_post_message (GST_ELEMENT (sink), GST_MESSAGE (errors->data));
311 /* send warning message to application and use a fakesink */
312 GST_ELEMENT_WARNING (sink, RESOURCE, NOT_FOUND, (NULL),
313 ("Failed to find a usable video sink"));
314 choice = gst_element_factory_make ("fakesink", "fake-video-sink");
315 if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync"))
316 g_object_set (choice, "sync", TRUE, NULL);
317 gst_element_set_state (choice, GST_STATE_READY);
320 gst_object_unref (bus);
321 gst_plugin_feature_list_free (list);
322 g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL);
323 g_slist_free (errors);
329 gst_auto_video_sink_detect (GstAutoVideoSink * sink)
334 gst_auto_video_sink_clear_kid (sink);
337 GST_DEBUG_OBJECT (sink, "Creating new kid");
338 if (!(esink = gst_auto_video_sink_find_best (sink)))
342 gst_bin_add (GST_BIN (sink), esink);
344 /* attach ghost pad */
345 GST_DEBUG_OBJECT (sink, "Re-assigning ghostpad");
346 targetpad = gst_element_get_static_pad (sink->kid, "sink");
347 if (!gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad))
350 gst_object_unref (targetpad);
351 GST_DEBUG_OBJECT (sink, "done changing auto video sink");
358 GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL),
359 ("Failed to find a supported video sink"));
364 GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL),
365 ("Failed to set target pad"));
366 gst_object_unref (targetpad);
371 static GstStateChangeReturn
372 gst_auto_video_sink_change_state (GstElement * element,
373 GstStateChange transition)
375 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
376 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (element);
378 switch (transition) {
379 case GST_STATE_CHANGE_NULL_TO_READY:
380 if (!gst_auto_video_sink_detect (sink))
381 return GST_STATE_CHANGE_FAILURE;
387 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
389 switch (transition) {
390 case GST_STATE_CHANGE_READY_TO_NULL:
391 gst_auto_video_sink_reset (sink);
401 gst_auto_video_sink_set_property (GObject * object, guint prop_id,
402 const GValue * value, GParamSpec * pspec)
404 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (object);
408 if (sink->filter_caps)
409 gst_caps_unref (sink->filter_caps);
410 sink->filter_caps = gst_caps_copy (gst_value_get_caps (value));
413 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
419 gst_auto_video_sink_get_property (GObject * object, guint prop_id,
420 GValue * value, GParamSpec * pspec)
422 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (object);
426 gst_value_set_caps (value, sink->filter_caps);
430 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);