2 * (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
3 * (c) 2006 Jan Schmidt <thaytan@noraisin.net>
4 * (c) 2008 Stefan Kost <ensonic@users.sf.net>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:element-autoaudiosrc
24 * @see_also: autovideosrc, alsasrc, osssrc
26 * autoaudiosrc is an audio source that automatically detects an appropriate
27 * audio source to use. It does so by scanning the registry for all elements
28 * that have <quote>Source</quote> and <quote>Audio</quote> in the class field
29 * of their element information, and also have a non-zero autoplugging rank.
32 * <title>Example launch line</title>
34 * gst-launch -v -m autoaudiosrc ! audioconvert ! audioresample ! autoaudiosink
45 #include "gstautoaudiosrc.h"
46 #include "gstautodetect.h"
55 static GstStateChangeReturn
56 gst_auto_audio_src_change_state (GstElement * element,
57 GstStateChange transition);
58 static void gst_auto_audio_src_dispose (GstAutoAudioSrc * src);
59 static void gst_auto_audio_src_clear_kid (GstAutoAudioSrc * src);
60 static void gst_auto_audio_src_set_property (GObject * object, guint prop_id,
61 const GValue * value, GParamSpec * pspec);
62 static void gst_auto_audio_src_get_property (GObject * object, guint prop_id,
63 GValue * value, GParamSpec * pspec);
65 GST_BOILERPLATE (GstAutoAudioSrc, gst_auto_audio_src, GstBin, GST_TYPE_BIN);
67 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
73 gst_auto_audio_src_base_init (gpointer klass)
75 GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
77 gst_element_class_add_static_pad_template (eklass, &src_template);
79 gst_element_class_set_details_simple (eklass, "Auto audio source",
81 "Wrapper audio source for automatically detected audio source",
82 "Jan Schmidt <thaytan@noraisin.net>, "
83 "Stefan Kost <ensonic@users.sf.net>");
87 gst_auto_audio_src_class_init (GstAutoAudioSrcClass * klass)
89 GObjectClass *gobject_class;
90 GstElementClass *eklass;
92 gobject_class = G_OBJECT_CLASS (klass);
93 eklass = GST_ELEMENT_CLASS (klass);
95 gobject_class->dispose = (GObjectFinalizeFunc) gst_auto_audio_src_dispose;
96 gobject_class->set_property = gst_auto_audio_src_set_property;
97 gobject_class->get_property = gst_auto_audio_src_get_property;
99 eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_audio_src_change_state);
102 * GstAutoAudioSrc:filter-caps
104 * This property will filter out candidate sinks that can handle the specified
105 * caps. By default only audio sinks that support raw floating point and
106 * integer audio are selected.
108 * This property can only be set before the element goes to the READY state.
112 g_object_class_install_property (gobject_class, PROP_CAPS,
113 g_param_spec_boxed ("filter-caps", "Filter caps",
114 "Filter sink candidates using these caps.", GST_TYPE_CAPS,
115 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
119 gst_auto_audio_src_dispose (GstAutoAudioSrc * src)
121 gst_auto_audio_src_clear_kid (src);
123 if (src->filter_caps)
124 gst_caps_unref (src->filter_caps);
125 src->filter_caps = NULL;
127 G_OBJECT_CLASS (parent_class)->dispose ((GObject *) src);
131 gst_auto_audio_src_clear_kid (GstAutoAudioSrc * src)
134 gst_element_set_state (src->kid, GST_STATE_NULL);
135 gst_bin_remove (GST_BIN (src), src->kid);
138 /* Don't lose SOURCE flag */
139 GST_OBJECT_FLAG_SET (src, GST_ELEMENT_IS_SOURCE);
144 * Hack to make initial linking work; ideally, this'd work even when
145 * no target has been assigned to the ghostpad yet.
148 gst_auto_audio_src_reset (GstAutoAudioSrc * src)
152 gst_auto_audio_src_clear_kid (src);
154 /* fakesink placeholder */
155 src->kid = gst_element_factory_make ("fakesrc", "tempsrc");
156 gst_bin_add (GST_BIN (src), src->kid);
159 targetpad = gst_element_get_static_pad (src->kid, "src");
160 gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad);
161 gst_object_unref (targetpad);
164 static GstStaticCaps raw_caps =
165 GST_STATIC_CAPS ("audio/x-raw-int; audio/x-raw-float");
168 gst_auto_audio_src_init (GstAutoAudioSrc * src, GstAutoAudioSrcClass * g_class)
170 src->pad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC);
171 gst_element_add_pad (GST_ELEMENT (src), src->pad);
173 gst_auto_audio_src_reset (src);
175 /* set the default raw audio caps */
176 src->filter_caps = gst_static_caps_get (&raw_caps);
179 GST_OBJECT_FLAG_SET (src, GST_ELEMENT_IS_SOURCE);
183 gst_auto_audio_src_factory_filter (GstPluginFeature * feature, gpointer data)
188 /* we only care about element factories */
189 if (!GST_IS_ELEMENT_FACTORY (feature))
193 klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
194 if (!(strstr (klass, "Source") && strstr (klass, "Audio")))
197 /* only select elements with autoplugging rank */
198 rank = gst_plugin_feature_get_rank (feature);
199 if (rank < GST_RANK_MARGINAL)
206 gst_auto_audio_src_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
210 diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
213 return strcmp (gst_plugin_feature_get_name (f2),
214 gst_plugin_feature_get_name (f1));
218 gst_auto_audio_src_create_element_with_pretty_name (GstAutoAudioSrc * src,
219 GstElementFactory * factory)
222 gchar *name, *marker;
224 marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name);
225 if (g_str_has_suffix (marker, "src"))
226 marker[strlen (marker) - 4] = '\0';
227 if (g_str_has_prefix (marker, "gst"))
228 g_memmove (marker, marker + 3, strlen (marker + 3) + 1);
229 name = g_strdup_printf ("%s-actual-src-%s", GST_OBJECT_NAME (src), marker);
232 element = gst_element_factory_create (factory, name);
239 gst_auto_audio_src_find_best (GstAutoAudioSrc * src)
242 GstElement *choice = NULL;
243 GstMessage *message = NULL;
244 GSList *errors = NULL;
245 GstBus *bus = gst_bus_new ();
246 GstPad *el_pad = NULL;
247 GstCaps *el_caps = NULL;
248 gboolean no_match = TRUE;
250 list = gst_registry_feature_filter (gst_registry_get_default (),
251 (GstPluginFeatureFilter) gst_auto_audio_src_factory_filter, FALSE, src);
252 list = g_list_sort (list, (GCompareFunc) gst_auto_audio_src_compare_ranks);
254 /* We don't treat sound server sources special. Our policy is that sound
255 * server sources that have a rank must not auto-spawn a daemon under any
256 * circumstances, so there's nothing for us to worry about here */
257 GST_LOG_OBJECT (src, "Trying to find usable audio devices ...");
259 for (item = list; item != NULL; item = item->next) {
260 GstElementFactory *f = GST_ELEMENT_FACTORY (item->data);
263 if ((el = gst_auto_audio_src_create_element_with_pretty_name (src, f))) {
264 GstStateChangeReturn ret;
266 GST_DEBUG_OBJECT (src, "Testing %s", GST_PLUGIN_FEATURE (f)->name);
268 /* If autoAudioSrc has been provided with filter caps,
269 * accept only sources that match with the filter caps */
270 if (src->filter_caps) {
271 el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "src");
272 el_caps = gst_pad_get_caps (el_pad);
273 gst_object_unref (el_pad);
274 GST_DEBUG_OBJECT (src,
275 "Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT,
276 src->filter_caps, el_caps);
277 no_match = !gst_caps_can_intersect (src->filter_caps, el_caps);
278 gst_caps_unref (el_caps);
281 GST_DEBUG_OBJECT (src, "Incompatible caps");
282 gst_object_unref (el);
285 GST_DEBUG_OBJECT (src, "Found compatible caps");
289 gst_element_set_bus (el, bus);
290 ret = gst_element_set_state (el, GST_STATE_READY);
291 if (ret == GST_STATE_CHANGE_SUCCESS) {
292 GST_DEBUG_OBJECT (src, "This worked!");
297 /* collect all error messages */
298 while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) {
299 GST_DEBUG_OBJECT (src, "error message %" GST_PTR_FORMAT, message);
300 errors = g_slist_append (errors, message);
303 gst_element_set_state (el, GST_STATE_NULL);
304 gst_object_unref (el);
308 GST_DEBUG_OBJECT (src, "done trying");
311 /* FIXME: we forward the first error for now; but later on it might make
312 * sense to actually analyse them */
313 gst_message_ref (GST_MESSAGE (errors->data));
314 GST_DEBUG_OBJECT (src, "reposting message %p", errors->data);
315 gst_element_post_message (GST_ELEMENT (src), GST_MESSAGE (errors->data));
317 /* send warning message to application and use a fakesrc */
318 GST_ELEMENT_WARNING (src, RESOURCE, NOT_FOUND, (NULL),
319 ("Failed to find a usable audio source"));
320 choice = gst_element_factory_make ("fakesrc", "fake-audio-src");
321 if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync"))
322 g_object_set (choice, "sync", TRUE, NULL);
323 gst_element_set_state (choice, GST_STATE_READY);
326 gst_object_unref (bus);
327 gst_plugin_feature_list_free (list);
328 g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL);
329 g_slist_free (errors);
335 gst_auto_audio_src_detect (GstAutoAudioSrc * src)
340 gst_auto_audio_src_clear_kid (src);
343 GST_DEBUG_OBJECT (src, "Creating new kid");
344 if (!(esrc = gst_auto_audio_src_find_best (src)))
348 /* Ensure the child is brought up to the right state to match the parent
349 * although it's currently always in READY and
350 * we're always doing NULL->READY. */
351 if (GST_STATE (src->kid) < GST_STATE (src))
352 gst_element_set_state (src->kid, GST_STATE (src));
354 gst_bin_add (GST_BIN (src), esrc);
356 /* attach ghost pad */
357 GST_DEBUG_OBJECT (src, "Re-assigning ghostpad");
358 targetpad = gst_element_get_static_pad (src->kid, "src");
359 if (!gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad))
362 gst_object_unref (targetpad);
363 GST_DEBUG_OBJECT (src, "done changing auto audio source");
370 GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL),
371 ("Failed to find a supported audio source"));
376 GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL),
377 ("Failed to set target pad"));
378 gst_object_unref (targetpad);
383 static GstStateChangeReturn
384 gst_auto_audio_src_change_state (GstElement * element,
385 GstStateChange transition)
387 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
388 GstAutoAudioSrc *src = GST_AUTO_AUDIO_SRC (element);
390 switch (transition) {
391 case GST_STATE_CHANGE_NULL_TO_READY:
392 if (!gst_auto_audio_src_detect (src))
393 return GST_STATE_CHANGE_FAILURE;
399 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
400 if (ret == GST_STATE_CHANGE_FAILURE)
403 switch (transition) {
404 case GST_STATE_CHANGE_READY_TO_NULL:
405 gst_auto_audio_src_reset (src);
415 gst_auto_audio_src_set_property (GObject * object, guint prop_id,
416 const GValue * value, GParamSpec * pspec)
418 GstAutoAudioSrc *src = GST_AUTO_AUDIO_SRC (object);
422 if (src->filter_caps)
423 gst_caps_unref (src->filter_caps);
424 src->filter_caps = gst_caps_copy (gst_value_get_caps (value));
427 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
433 gst_auto_audio_src_get_property (GObject * object, guint prop_id,
434 GValue * value, GParamSpec * pspec)
436 GstAutoAudioSrc *src = GST_AUTO_AUDIO_SRC (object);
440 gst_value_set_caps (value, src->filter_caps);
444 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);