/* GStreamer * (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net> * (c) 2006 Jan Schmidt <thaytan@noraisin.net> * (c) 2008 Stefan Kost <ensonic@users.sf.net> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-autovideosrc * @see_also: autoaudiosrc, v4l2src, v4lsrc * * autovideosrc is a video src that automatically detects an appropriate * video source to use. It does so by scanning the registry for all elements * that have <quote>Source</quote> and <quote>Video</quote> in the class field * of their element information, and also have a non-zero autoplugging rank. * * <refsect2> * <title>Example launch line</title> * |[ * gst-launch -v -m autovideosrc ! xvimagesink * ]| * </refsect2> */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <string.h> #include "gstautovideosrc.h" #include "gstautodetect.h" /* Properties */ enum { PROP_0, PROP_CAPS, }; static GstStateChangeReturn gst_auto_video_src_change_state (GstElement * element, GstStateChange transition); static void gst_auto_video_src_dispose (GstAutoVideoSrc * src); static void gst_auto_video_src_clear_kid (GstAutoVideoSrc * src); static void gst_auto_video_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_auto_video_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); GST_BOILERPLATE (GstAutoVideoSrc, gst_auto_video_src, GstBin, GST_TYPE_BIN); static const GstElementDetails gst_auto_video_src_details = GST_ELEMENT_DETAILS ("Auto video source", "Source/Video", "Wrapper video source for automatically detected video source", "Ronald Bultje <rbultje@ronald.bitfreak.net>\n" "Jan Schmidt <thaytan@noraisin.net>\n" "Stefan Kost <ensonic@users.sf.net>"); static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static void gst_auto_video_src_base_init (gpointer klass) { GstElementClass *eklass = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (eklass, gst_static_pad_template_get (&src_template)); gst_element_class_set_details (eklass, &gst_auto_video_src_details); } static void gst_auto_video_src_class_init (GstAutoVideoSrcClass * klass) { GObjectClass *gobject_class; GstElementClass *eklass = GST_ELEMENT_CLASS (klass); gobject_class = G_OBJECT_CLASS (klass); gobject_class->dispose = (GObjectFinalizeFunc) GST_DEBUG_FUNCPTR (gst_auto_video_src_dispose); eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_video_src_change_state); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_auto_video_src_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_auto_video_src_get_property); /** * GstAutoVideoSrc:filter-caps * * This property will filter out candidate sources that can handle the specified * caps. By default only video sources that support raw rgb and yuv video * are selected. * * This property can only be set before the element goes to the READY state. * * Since: 0.10.14 **/ g_object_class_install_property (gobject_class, PROP_CAPS, g_param_spec_boxed ("filter-caps", "Filter caps", "Filter src candidates using these caps.", GST_TYPE_CAPS, G_PARAM_READWRITE)); } static void gst_auto_video_src_dispose (GstAutoVideoSrc * src) { gst_auto_video_src_clear_kid (src); if (src->filter_caps) gst_caps_unref (src->filter_caps); src->filter_caps = NULL; G_OBJECT_CLASS (parent_class)->dispose ((GObject *) src); } static void gst_auto_video_src_clear_kid (GstAutoVideoSrc * src) { if (src->kid) { gst_element_set_state (src->kid, GST_STATE_NULL); gst_bin_remove (GST_BIN (src), src->kid); src->kid = NULL; } } /* * Hack to make initial linking work; ideally, this'd work even when * no target has been assigned to the ghostpad yet. */ static void gst_auto_video_src_reset (GstAutoVideoSrc * src) { GstPad *targetpad; /* Remove any existing element */ gst_auto_video_src_clear_kid (src); /* fakesrc placeholder */ src->kid = gst_element_factory_make ("fakesrc", "tempsrc"); gst_bin_add (GST_BIN (src), src->kid); /* pad */ targetpad = gst_element_get_static_pad (src->kid, "src"); gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad); gst_object_unref (targetpad); } static GstStaticCaps raw_caps = GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb"); static void gst_auto_video_src_init (GstAutoVideoSrc * src, GstAutoVideoSrcClass * g_class) { src->pad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC); gst_element_add_pad (GST_ELEMENT (src), src->pad); gst_auto_video_src_reset (src); /* set the default raw video caps */ src->filter_caps = gst_static_caps_get (&raw_caps); /* mark as source */ GST_OBJECT_FLAG_UNSET (src, GST_ELEMENT_IS_SINK); } static gboolean gst_auto_video_src_factory_filter (GstPluginFeature * feature, gpointer data) { guint rank; const gchar *klass; /* we only care about element factories */ if (!GST_IS_ELEMENT_FACTORY (feature)) return FALSE; /* video sources */ klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature)); if (!(strstr (klass, "Source") && strstr (klass, "Video"))) return FALSE; /* only select elements with autoplugging rank */ rank = gst_plugin_feature_get_rank (feature); if (rank < GST_RANK_MARGINAL) return FALSE; return TRUE; } static gint gst_auto_video_src_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2) { gint diff; diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1); if (diff != 0) return diff; return strcmp (gst_plugin_feature_get_name (f2), gst_plugin_feature_get_name (f1)); } static GstElement * gst_auto_video_src_create_element_with_pretty_name (GstAutoVideoSrc * src, GstElementFactory * factory) { GstElement *element; gchar *name, *marker; marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name); if (g_str_has_suffix (marker, "src")) marker[strlen (marker) - 4] = '\0'; if (g_str_has_prefix (marker, "gst")) g_memmove (marker, marker + 3, strlen (marker + 3) + 1); name = g_strdup_printf ("%s-actual-src-%s", GST_OBJECT_NAME (src), marker); g_free (marker); element = gst_element_factory_create (factory, name); g_free (name); return element; } static GstElement * gst_auto_video_src_find_best (GstAutoVideoSrc * src) { GList *list, *item; GstElement *choice = NULL; GstMessage *message = NULL; GSList *errors = NULL; GstBus *bus = gst_bus_new (); GstPad *el_pad = NULL; GstCaps *el_caps = NULL, *intersect = NULL; gboolean no_match = TRUE; list = gst_registry_feature_filter (gst_registry_get_default (), (GstPluginFeatureFilter) gst_auto_video_src_factory_filter, FALSE, src); list = g_list_sort (list, (GCompareFunc) gst_auto_video_src_compare_ranks); GST_LOG_OBJECT (src, "Trying to find usable video devices ..."); for (item = list; item != NULL; item = item->next) { GstElementFactory *f = GST_ELEMENT_FACTORY (item->data); GstElement *el; if ((el = gst_auto_video_src_create_element_with_pretty_name (src, f))) { GstStateChangeReturn ret; GST_DEBUG_OBJECT (src, "Testing %s", GST_PLUGIN_FEATURE (f)->name); /* If AutoVideoSrc has been provided with filter caps, * accept only sources that match with the filter caps */ if (src->filter_caps) { el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "src"); el_caps = gst_pad_get_caps (el_pad); gst_object_unref (el_pad); GST_DEBUG_OBJECT (src, "Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT, src->filter_caps, el_caps); intersect = gst_caps_intersect (src->filter_caps, el_caps); no_match = gst_caps_is_empty (intersect); gst_caps_unref (el_caps); gst_caps_unref (intersect); if (no_match) { GST_DEBUG_OBJECT (src, "Incompatible caps"); gst_object_unref (el); continue; } else { GST_DEBUG_OBJECT (src, "Found compatible caps"); } } gst_element_set_bus (el, bus); ret = gst_element_set_state (el, GST_STATE_READY); if (ret == GST_STATE_CHANGE_SUCCESS) { GST_DEBUG_OBJECT (src, "This worked!"); choice = el; break; } /* collect all error messages */ while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) { GST_DEBUG_OBJECT (src, "error message %" GST_PTR_FORMAT, message); errors = g_slist_append (errors, message); } gst_element_set_state (el, GST_STATE_NULL); gst_object_unref (el); } } GST_DEBUG_OBJECT (src, "done trying"); if (!choice) { if (errors) { /* FIXME: we forward the first error for now; but later on it might make * sense to actually analyse them */ gst_message_ref (GST_MESSAGE (errors->data)); GST_DEBUG_OBJECT (src, "reposting message %p", errors->data); gst_element_post_message (GST_ELEMENT (src), GST_MESSAGE (errors->data)); } else { /* send warning message to application and use a fakesrc */ GST_ELEMENT_WARNING (src, RESOURCE, NOT_FOUND, (NULL), ("Failed to find a usable video source")); choice = gst_element_factory_make ("fakesrc", "fake-video-src"); if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync")) g_object_set (choice, "sync", TRUE, NULL); gst_element_set_state (choice, GST_STATE_READY); } } gst_object_unref (bus); gst_plugin_feature_list_free (list); g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL); g_slist_free (errors); return choice; } static gboolean gst_auto_video_src_detect (GstAutoVideoSrc * src) { GstElement *esrc; GstPad *targetpad; gst_auto_video_src_clear_kid (src); /* find element */ GST_DEBUG_OBJECT (src, "Creating new kid"); if (!(esrc = gst_auto_video_src_find_best (src))) goto no_src; src->kid = esrc; gst_bin_add (GST_BIN (src), esrc); /* attach ghost pad */ GST_DEBUG_OBJECT (src, "Re-assigning ghostpad"); targetpad = gst_element_get_static_pad (src->kid, "src"); if (!gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad)) goto target_failed; gst_object_unref (targetpad); GST_DEBUG_OBJECT (src, "done changing auto video source"); return TRUE; /* ERRORS */ no_src: { GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL), ("Failed to find a supported video source")); return FALSE; } target_failed: { GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL), ("Failed to set target pad")); gst_object_unref (targetpad); return FALSE; } } static GstStateChangeReturn gst_auto_video_src_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: if (!gst_auto_video_src_detect (src)) return GST_STATE_CHANGE_FAILURE; break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_READY_TO_NULL: gst_auto_video_src_reset (src); break; default: break; } return ret; } static void gst_auto_video_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object); switch (prop_id) { case PROP_CAPS: if (src->filter_caps) gst_caps_unref (src->filter_caps); src->filter_caps = gst_caps_copy (gst_value_get_caps (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_auto_video_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object); switch (prop_id) { case PROP_CAPS:{ gst_value_set_caps (value, src->filter_caps); break; } default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }