/* GStreamer * * Copyright 2007-2012 Collabora Ltd * @author: Olivier Crete * Copyright 2007-2008 Nokia * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:element-autoconvert * * The #autoconvert element has one sink and one source pad. It will look for * other elements that also have one sink and one source pad. * It will then pick an element that matches the caps on both sides. * If the caps change, it may change the selected element if the current one * no longer matches the caps. * * The list of element it will look into can be specified in the * #GstAutoConvert::factories property, otherwise it will look at all available * elements. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstautoconvert.h" #include GST_DEBUG_CATEGORY (autoconvert_debug); #define GST_CAT_DEFAULT (autoconvert_debug) #define GST_AUTOCONVERT_LOCK(ac) GST_OBJECT_LOCK (ac) #define GST_AUTOCONVERT_UNLOCK(ac) GST_OBJECT_UNLOCK (ac) /* elementfactory information */ static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate sink_internal_template = GST_STATIC_PAD_TEMPLATE ("sink_internal", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate src_internal_template = GST_STATIC_PAD_TEMPLATE ("src_internal", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); /* GstAutoConvert signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { PROP_0, PROP_FACTORIES }; static void gst_auto_convert_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_auto_convert_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_auto_convert_dispose (GObject * object); static GstElement *gst_auto_convert_get_subelement (GstAutoConvert * autoconvert); static GstPad *gst_auto_convert_get_internal_sinkpad (GstAutoConvert * autoconvert); static GstPad *gst_auto_convert_get_internal_srcpad (GstAutoConvert * autoconvert); static GstIterator *gst_auto_convert_iterate_internal_links (GstPad * pad, GstObject * parent); static gboolean gst_auto_convert_sink_setcaps (GstAutoConvert * autoconvert, GstCaps * caps); static GstCaps *gst_auto_convert_getcaps (GstAutoConvert * autoconvert, GstCaps * filter, GstPadDirection dir); static GstFlowReturn gst_auto_convert_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static GstFlowReturn gst_auto_convert_sink_chain_list (GstPad * pad, GstObject * parent, GstBufferList * list); static gboolean gst_auto_convert_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_auto_convert_sink_query (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_auto_convert_src_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_auto_convert_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static GstFlowReturn gst_auto_convert_internal_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static GstFlowReturn gst_auto_convert_internal_sink_chain_list (GstPad * pad, GstObject * parent, GstBufferList * list); static gboolean gst_auto_convert_internal_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_auto_convert_internal_sink_query (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_auto_convert_internal_src_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_auto_convert_internal_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static GList *gst_auto_convert_load_factories (GstAutoConvert * autoconvert); static GstElement * gst_auto_convert_get_or_make_element_from_factory (GstAutoConvert * autoconvert, GstElementFactory * factory); static gboolean gst_auto_convert_activate_element (GstAutoConvert * autoconvert, GstElement * element, GstCaps * caps); static GQuark internal_srcpad_quark = 0; static GQuark internal_sinkpad_quark = 0; static GQuark parent_quark = 0; G_DEFINE_TYPE (GstAutoConvert, gst_auto_convert, GST_TYPE_BIN); static void gst_auto_convert_class_init (GstAutoConvertClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstElementClass *gstelement_class = (GstElementClass *) klass; GST_DEBUG_CATEGORY_INIT (autoconvert_debug, "autoconvert", 0, "Auto convert based on caps"); internal_srcpad_quark = g_quark_from_static_string ("internal_srcpad"); internal_sinkpad_quark = g_quark_from_static_string ("internal_sinkpad"); parent_quark = g_quark_from_static_string ("parent"); gst_element_class_add_static_pad_template (gstelement_class, &srctemplate); gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate); gst_element_class_set_static_metadata (gstelement_class, "Select convertor based on caps", "Generic/Bin", "Selects the right transform element based on the caps", "Olivier Crete "); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_auto_convert_dispose); gobject_class->set_property = gst_auto_convert_set_property; gobject_class->get_property = gst_auto_convert_get_property; g_object_class_install_property (gobject_class, PROP_FACTORIES, g_param_spec_pointer ("factories", "GList of GstElementFactory", "GList of GstElementFactory objects to pick from (the element takes" " ownership of the list (NULL means it will go through all possible" " elements), can only be set once", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_auto_convert_init (GstAutoConvert * autoconvert) { autoconvert->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink"); autoconvert->srcpad = gst_pad_new_from_static_template (&srctemplate, "src"); gst_pad_set_chain_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_sink_chain)); gst_pad_set_chain_list_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_sink_chain_list)); gst_pad_set_event_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_sink_event)); gst_pad_set_query_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_sink_query)); gst_pad_set_iterate_internal_links_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_iterate_internal_links)); gst_pad_set_event_function (autoconvert->srcpad, GST_DEBUG_FUNCPTR (gst_auto_convert_src_event)); gst_pad_set_query_function (autoconvert->srcpad, GST_DEBUG_FUNCPTR (gst_auto_convert_src_query)); gst_pad_set_iterate_internal_links_function (autoconvert->sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_iterate_internal_links)); gst_element_add_pad (GST_ELEMENT (autoconvert), autoconvert->sinkpad); gst_element_add_pad (GST_ELEMENT (autoconvert), autoconvert->srcpad); } static void gst_auto_convert_dispose (GObject * object) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object); g_clear_object (&autoconvert->current_subelement); g_clear_object (&autoconvert->current_internal_sinkpad); g_clear_object (&autoconvert->current_internal_srcpad); for (;;) { GList *factories = g_atomic_pointer_get (&autoconvert->factories); if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories, factories, NULL)) { gst_plugin_feature_list_free (factories); break; } } G_OBJECT_CLASS (gst_auto_convert_parent_class)->dispose (object); } static void gst_auto_convert_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object); switch (prop_id) { default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; case PROP_FACTORIES: if (g_atomic_pointer_get (&autoconvert->factories) == NULL) { GList *factories = g_value_get_pointer (value); factories = g_list_copy (factories); if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories, NULL, factories)) g_list_foreach (factories, (GFunc) g_object_ref, NULL); else g_list_free (factories); } else { GST_WARNING_OBJECT (object, "Can not reset factories after they" " have been set or auto-discovered"); } break; } } static void gst_auto_convert_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object); switch (prop_id) { default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; case PROP_FACTORIES: g_value_set_pointer (value, g_atomic_pointer_get (&autoconvert->factories)); break; } } static GstElement * gst_auto_convert_get_element_by_type (GstAutoConvert * autoconvert, GType type) { GList *item; GstBin *bin = GST_BIN (autoconvert); GstElement *element = NULL; g_return_val_if_fail (type != 0, NULL); GST_OBJECT_LOCK (autoconvert); for (item = bin->children; item; item = item->next) { if (G_TYPE_CHECK_INSTANCE_TYPE (item->data, type)) { element = gst_object_ref (item->data); break; } } GST_OBJECT_UNLOCK (autoconvert); return element; } /** * get_pad_by_direction: * @element: The Element * @direction: The direction * * Gets a #GstPad that goes in the requested direction. I will return NULL * if there is no pad or if there is more than one pad in this direction */ static GstPad * get_pad_by_direction (GstElement * element, GstPadDirection direction) { GstIterator *iter = gst_element_iterate_pads (element); GstPad *selected_pad = NULL; gboolean done; GValue item = { 0, }; if (!iter) return NULL; done = FALSE; while (!done) { switch (gst_iterator_next (iter, &item)) { case GST_ITERATOR_OK: { GstPad *pad = g_value_get_object (&item); if (gst_pad_get_direction (pad) == direction) { /* We check if there is more than one pad in this direction, * if there is, we return NULL so that the element is refused */ if (selected_pad) { done = TRUE; gst_object_unref (selected_pad); selected_pad = NULL; } else { selected_pad = g_object_ref (pad); } } g_value_unset (&item); } break; case GST_ITERATOR_RESYNC: if (selected_pad) { gst_object_unref (selected_pad); selected_pad = NULL; } gst_iterator_resync (iter); break; case GST_ITERATOR_ERROR: GST_ERROR ("Error iterating pads of element %s", GST_OBJECT_NAME (element)); gst_object_unref (selected_pad); selected_pad = NULL; done = TRUE; break; case GST_ITERATOR_DONE: done = TRUE; break; } } g_value_unset (&item); gst_iterator_free (iter); if (!selected_pad) GST_ERROR ("Did not find pad of direction %d in %s", direction, GST_OBJECT_NAME (element)); return selected_pad; } static GstElement * gst_auto_convert_get_subelement (GstAutoConvert * autoconvert) { GstElement *element = NULL; GST_AUTOCONVERT_LOCK (autoconvert); if (autoconvert->current_subelement) element = gst_object_ref (autoconvert->current_subelement); GST_AUTOCONVERT_UNLOCK (autoconvert); return element; } static GstPad * gst_auto_convert_get_internal_sinkpad (GstAutoConvert * autoconvert) { GstPad *pad = NULL; GST_AUTOCONVERT_LOCK (autoconvert); if (autoconvert->current_internal_sinkpad) pad = gst_object_ref (autoconvert->current_internal_sinkpad); GST_AUTOCONVERT_UNLOCK (autoconvert); return pad; } static GstPad * gst_auto_convert_get_internal_srcpad (GstAutoConvert * autoconvert) { GstPad *pad = NULL; GST_AUTOCONVERT_LOCK (autoconvert); if (autoconvert->current_internal_srcpad) pad = gst_object_ref (autoconvert->current_internal_srcpad); GST_AUTOCONVERT_UNLOCK (autoconvert); return pad; } /* * This function creates and adds an element to the GstAutoConvert * it then creates the internal pads and links them * */ static GstElement * gst_auto_convert_add_element (GstAutoConvert * autoconvert, GstElementFactory * factory) { GstElement *element = NULL; GstPad *internal_sinkpad = NULL; GstPad *internal_srcpad = NULL; GstPad *sinkpad = NULL; GstPad *srcpad = NULL; GstPadLinkReturn padlinkret; GST_DEBUG_OBJECT (autoconvert, "Adding element %s to the autoconvert bin", gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory))); element = gst_element_factory_create (factory, NULL); if (!element) return NULL; if (!gst_bin_add (GST_BIN (autoconvert), element)) { GST_ERROR_OBJECT (autoconvert, "Could not add element %s to the bin", GST_OBJECT_NAME (element)); gst_object_unref (element); return NULL; } srcpad = get_pad_by_direction (element, GST_PAD_SRC); if (!srcpad) { GST_ERROR_OBJECT (autoconvert, "Could not find source in %s", GST_OBJECT_NAME (element)); goto error; } sinkpad = get_pad_by_direction (element, GST_PAD_SINK); if (!sinkpad) { GST_ERROR_OBJECT (autoconvert, "Could not find sink in %s", GST_OBJECT_NAME (element)); goto error; } internal_sinkpad = gst_pad_new_from_static_template (&sink_internal_template, "sink_internal"); internal_srcpad = gst_pad_new_from_static_template (&src_internal_template, "src_internal"); if (!internal_sinkpad || !internal_srcpad) { GST_ERROR_OBJECT (autoconvert, "Could not create internal pads"); if (internal_srcpad) gst_object_unref (internal_srcpad); if (internal_sinkpad) gst_object_unref (internal_sinkpad); goto error; } g_object_weak_ref (G_OBJECT (element), (GWeakNotify) gst_object_unref, internal_sinkpad); g_object_weak_ref (G_OBJECT (element), (GWeakNotify) gst_object_unref, internal_srcpad); gst_pad_set_active (internal_sinkpad, TRUE); gst_pad_set_active (internal_srcpad, TRUE); g_object_set_qdata (G_OBJECT (internal_srcpad), parent_quark, autoconvert); g_object_set_qdata (G_OBJECT (internal_sinkpad), parent_quark, autoconvert); gst_pad_set_chain_function (internal_sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_chain)); gst_pad_set_chain_list_function (internal_sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_chain_list)); gst_pad_set_event_function (internal_sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_event)); gst_pad_set_query_function (internal_sinkpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_query)); gst_pad_set_event_function (internal_srcpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_src_event)); gst_pad_set_query_function (internal_srcpad, GST_DEBUG_FUNCPTR (gst_auto_convert_internal_src_query)); padlinkret = gst_pad_link_full (internal_srcpad, sinkpad, GST_PAD_LINK_CHECK_NOTHING); if (GST_PAD_LINK_FAILED (padlinkret)) { GST_WARNING_OBJECT (autoconvert, "Could not links pad %s:%s to %s:%s" " for reason %d", GST_DEBUG_PAD_NAME (internal_srcpad), GST_DEBUG_PAD_NAME (sinkpad), padlinkret); goto error; } padlinkret = gst_pad_link_full (srcpad, internal_sinkpad, GST_PAD_LINK_CHECK_NOTHING); if (GST_PAD_LINK_FAILED (padlinkret)) { GST_WARNING_OBJECT (autoconvert, "Could not links pad %s:%s to %s:%s" " for reason %d", GST_DEBUG_PAD_NAME (internal_srcpad), GST_DEBUG_PAD_NAME (sinkpad), padlinkret); goto error; } g_object_set_qdata (G_OBJECT (element), internal_srcpad_quark, internal_srcpad); g_object_set_qdata (G_OBJECT (element), internal_sinkpad_quark, internal_sinkpad); /* Iffy */ gst_element_sync_state_with_parent (element); /* Increment the reference count we will return to the caller */ gst_object_ref (element); /* unref sink and src pad */ gst_object_unref (srcpad); gst_object_unref (sinkpad); return element; error: gst_element_set_locked_state (element, TRUE); gst_element_set_state (element, GST_STATE_NULL); gst_bin_remove (GST_BIN (autoconvert), element); if (srcpad) gst_object_unref (srcpad); if (sinkpad) gst_object_unref (sinkpad); return NULL; } static GstElement * gst_auto_convert_get_or_make_element_from_factory (GstAutoConvert * autoconvert, GstElementFactory * factory) { GstElement *element = NULL; GstElementFactory *loaded_factory = GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE (factory))); if (!loaded_factory) return NULL; element = gst_auto_convert_get_element_by_type (autoconvert, gst_element_factory_get_element_type (loaded_factory)); if (!element) { element = gst_auto_convert_add_element (autoconvert, loaded_factory); } gst_object_unref (loaded_factory); return element; } /* * This function checks if there is one and only one pad template on the * factory that can accept the given caps. If there is one and only one, * it returns TRUE, otherwise, its FALSE */ static gboolean factory_can_intersect (GstAutoConvert * autoconvert, GstElementFactory * factory, GstPadDirection direction, GstCaps * caps) { const GList *templates; gint has_direction = FALSE; gboolean ret = FALSE; g_return_val_if_fail (factory != NULL, FALSE); g_return_val_if_fail (caps != NULL, FALSE); templates = gst_element_factory_get_static_pad_templates (factory); while (templates) { GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data; if (template->direction == direction) { GstCaps *tmpl_caps = NULL; gboolean intersect; /* If there is more than one pad in this direction, we return FALSE * Only transform elements (with one sink and one source pad) * are accepted */ if (has_direction) { GST_DEBUG_OBJECT (autoconvert, "Factory %p" " has more than one static template with dir %d", template, direction); return FALSE; } has_direction = TRUE; tmpl_caps = gst_static_caps_get (&template->static_caps); intersect = gst_caps_can_intersect (tmpl_caps, caps); GST_DEBUG_OBJECT (autoconvert, "Factories %" GST_PTR_FORMAT " static caps %" GST_PTR_FORMAT " and caps %" GST_PTR_FORMAT " can%s intersect", factory, tmpl_caps, caps, intersect ? "" : " not"); gst_caps_unref (tmpl_caps); ret |= intersect; } templates = g_list_next (templates); } return ret; } static gboolean sticky_event_push (GstPad * pad, GstEvent ** event, gpointer user_data) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (user_data); gst_event_ref (*event); gst_pad_push_event (autoconvert->current_internal_srcpad, *event); return TRUE; } static gboolean gst_auto_convert_activate_element (GstAutoConvert * autoconvert, GstElement * element, GstCaps * caps) { GstPad *internal_srcpad = g_object_get_qdata (G_OBJECT (element), internal_srcpad_quark); GstPad *internal_sinkpad = g_object_get_qdata (G_OBJECT (element), internal_sinkpad_quark); if (caps) { /* check if the element can really accept said caps */ if (!gst_pad_peer_query_accept_caps (internal_srcpad, caps)) { GST_DEBUG_OBJECT (autoconvert, "Could not set %s:%s to %" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (internal_srcpad), caps); return FALSE; } } GST_AUTOCONVERT_LOCK (autoconvert); gst_object_replace ((GstObject **) & autoconvert->current_subelement, GST_OBJECT (element)); gst_object_replace ((GstObject **) & autoconvert->current_internal_srcpad, GST_OBJECT (internal_srcpad)); gst_object_replace ((GstObject **) & autoconvert->current_internal_sinkpad, GST_OBJECT (internal_sinkpad)); GST_AUTOCONVERT_UNLOCK (autoconvert); gst_pad_sticky_events_foreach (autoconvert->sinkpad, sticky_event_push, autoconvert); gst_pad_push_event (autoconvert->sinkpad, gst_event_new_reconfigure ()); GST_INFO_OBJECT (autoconvert, "Selected element %s", GST_OBJECT_NAME (GST_OBJECT (element))); gst_object_unref (element); return TRUE; } static GstIterator * gst_auto_convert_iterate_internal_links (GstPad * pad, GstObject * parent) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); GstIterator *it = NULL; GstPad *internal; if (pad == autoconvert->sinkpad) internal = gst_auto_convert_get_internal_srcpad (autoconvert); else internal = gst_auto_convert_get_internal_sinkpad (autoconvert); if (internal) { GValue val = { 0, }; g_value_init (&val, GST_TYPE_PAD); g_value_take_object (&val, internal); it = gst_iterator_new_single (GST_TYPE_PAD, &val); g_value_unset (&val); } return it; } /* * If there is already an internal element, it will try to call set_caps on it * * If there isn't an internal element or if the set_caps() on the internal * element failed, it will try to find another element where it would succeed * and will change the internal element. */ static gboolean gst_auto_convert_sink_setcaps (GstAutoConvert * autoconvert, GstCaps * caps) { GList *elem; GstCaps *other_caps = NULL; GList *factories; GstCaps *current_caps; g_return_val_if_fail (autoconvert != NULL, FALSE); current_caps = gst_pad_get_current_caps (autoconvert->sinkpad); if (current_caps) { if (gst_caps_is_equal_fixed (caps, current_caps)) { gst_caps_unref (current_caps); return TRUE; } gst_caps_unref (current_caps); } if (autoconvert->current_subelement) { if (gst_pad_peer_query_accept_caps (autoconvert->current_internal_srcpad, caps)) { /* If we can set the new caps on the current element, * then we just get out */ GST_DEBUG_OBJECT (autoconvert, "Could set %s:%s to %" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (autoconvert->current_internal_srcpad), caps); goto get_out; } else { /* If the current element doesn't work, * then we remove the current element before finding a new one. */ GST_AUTOCONVERT_LOCK (autoconvert); g_clear_object (&autoconvert->current_subelement); g_clear_object (&autoconvert->current_internal_sinkpad); g_clear_object (&autoconvert->current_internal_srcpad); GST_AUTOCONVERT_UNLOCK (autoconvert); } } other_caps = gst_pad_peer_query_caps (autoconvert->srcpad, NULL); factories = g_atomic_pointer_get (&autoconvert->factories); if (!factories) factories = gst_auto_convert_load_factories (autoconvert); for (elem = factories; elem; elem = g_list_next (elem)) { GstElementFactory *factory = GST_ELEMENT_FACTORY (elem->data); GstElement *element; /* Lets first check if according to the static pad templates on the factory * these caps have any chance of success */ if (!factory_can_intersect (autoconvert, factory, GST_PAD_SINK, caps)) { GST_LOG_OBJECT (autoconvert, "Factory %s does not accept sink caps %" GST_PTR_FORMAT, gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)), caps); continue; } if (other_caps != NULL) { if (!factory_can_intersect (autoconvert, factory, GST_PAD_SRC, other_caps)) { GST_LOG_OBJECT (autoconvert, "Factory %s does not accept src caps %" GST_PTR_FORMAT, gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)), other_caps); continue; } } /* The element had a chance of success, lets make it */ element = gst_auto_convert_get_or_make_element_from_factory (autoconvert, factory); if (!element) continue; /* And make it the current child */ if (gst_auto_convert_activate_element (autoconvert, element, caps)) break; else gst_object_unref (element); } get_out: if (other_caps) gst_caps_unref (other_caps); if (autoconvert->current_subelement) { return TRUE; } else { GST_WARNING_OBJECT (autoconvert, "Could not find a matching element for caps"); return FALSE; } } /* * This function filters the pad pad templates, taking only transform element * (with one sink and one src pad) */ static gboolean gst_auto_convert_default_filter_func (GstPluginFeature * feature, gpointer user_data) { GstElementFactory *factory = NULL; const GList *static_pad_templates, *tmp; GstStaticPadTemplate *src = NULL, *sink = NULL; if (!GST_IS_ELEMENT_FACTORY (feature)) return FALSE; factory = GST_ELEMENT_FACTORY (feature); static_pad_templates = gst_element_factory_get_static_pad_templates (factory); for (tmp = static_pad_templates; tmp; tmp = g_list_next (tmp)) { GstStaticPadTemplate *template = tmp->data; GstCaps *caps; if (template->presence == GST_PAD_SOMETIMES) return FALSE; if (template->presence != GST_PAD_ALWAYS) continue; switch (template->direction) { case GST_PAD_SRC: if (src) return FALSE; src = template; break; case GST_PAD_SINK: if (sink) return FALSE; sink = template; break; default: return FALSE; } caps = gst_static_pad_template_get_caps (template); if (gst_caps_is_any (caps) || gst_caps_is_empty (caps)) return FALSE; } if (!src || !sink) return FALSE; return TRUE; } /* function used to sort element features * Copy-pasted from decodebin */ static gint compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2) { gint diff; const gchar *rname1, *rname2; diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1); if (diff != 0) return diff; rname1 = gst_plugin_feature_get_name (f1); rname2 = gst_plugin_feature_get_name (f2); diff = strcmp (rname2, rname1); return diff; } static GList * gst_auto_convert_load_factories (GstAutoConvert * autoconvert) { GList *all_factories; all_factories = gst_registry_feature_filter (gst_registry_get (), gst_auto_convert_default_filter_func, FALSE, NULL); all_factories = g_list_sort (all_factories, (GCompareFunc) compare_ranks); g_assert (all_factories); if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories, NULL, all_factories)) { gst_plugin_feature_list_free (all_factories); } return g_atomic_pointer_get (&autoconvert->factories); } /* In this case, we should almost always have an internal element, because * set_caps() should have been called first */ static GstFlowReturn gst_auto_convert_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); if (autoconvert->current_internal_srcpad) { ret = gst_pad_push (autoconvert->current_internal_srcpad, buffer); if (ret != GST_FLOW_OK) GST_DEBUG_OBJECT (autoconvert, "Child element %" GST_PTR_FORMAT "returned flow %s", autoconvert->current_subelement, gst_flow_get_name (ret)); } else { GST_ERROR_OBJECT (autoconvert, "Got buffer without an negotiated element," " returning not-negotiated"); } return ret; } static GstFlowReturn gst_auto_convert_sink_chain_list (GstPad * pad, GstObject * parent, GstBufferList * list) { GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); if (autoconvert->current_internal_srcpad) { ret = gst_pad_push_list (autoconvert->current_internal_srcpad, list); if (ret != GST_FLOW_OK) GST_DEBUG_OBJECT (autoconvert, "Child element %" GST_PTR_FORMAT "returned flow %s", autoconvert->current_subelement, gst_flow_get_name (ret)); } else { GST_ERROR_OBJECT (autoconvert, "Got buffer without an negotiated element," " returning not-negotiated"); } return ret; } static gboolean gst_auto_convert_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean ret = TRUE; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); GstPad *internal_srcpad; if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) { GstCaps *caps; gst_event_parse_caps (event, &caps); ret = gst_auto_convert_sink_setcaps (autoconvert, caps); if (!ret) { gst_event_unref (event); return ret; } } internal_srcpad = gst_auto_convert_get_internal_srcpad (autoconvert); if (internal_srcpad) { ret = gst_pad_push_event (internal_srcpad, event); gst_object_unref (internal_srcpad); } else { switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: case GST_EVENT_FLUSH_START: ret = gst_pad_push_event (autoconvert->srcpad, event); break; default: gst_event_unref (event); ret = TRUE; break; } } return ret; } /* TODO Properly test that this code works well for queries */ static gboolean gst_auto_convert_sink_query (GstPad * pad, GstObject * parent, GstQuery * query) { gboolean ret = TRUE; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); GstElement *subelement; if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) { GstCaps *filter, *caps; gst_query_parse_caps (query, &filter); caps = gst_auto_convert_getcaps (autoconvert, filter, GST_PAD_SINK); gst_query_set_caps_result (query, caps); gst_caps_unref (caps); return TRUE; } subelement = gst_auto_convert_get_subelement (autoconvert); if (subelement) { GstPad *sub_sinkpad = get_pad_by_direction (subelement, GST_PAD_SINK); ret = gst_pad_query (sub_sinkpad, query); gst_object_unref (sub_sinkpad); gst_object_unref (subelement); if (ret && GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) { gboolean res; gst_query_parse_accept_caps_result (query, &res); if (!res) goto ignore_acceptcaps_failure; } return ret; } ignore_acceptcaps_failure: if (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) { GstCaps *caps; GstCaps *accept_caps; gst_query_parse_accept_caps (query, &accept_caps); caps = gst_auto_convert_getcaps (autoconvert, accept_caps, GST_PAD_SINK); gst_query_set_accept_caps_result (query, gst_caps_can_intersect (caps, accept_caps)); gst_caps_unref (caps); return TRUE; } GST_WARNING_OBJECT (autoconvert, "Got query %s while no element was" " selected, letting through", gst_query_type_get_name (GST_QUERY_TYPE (query))); return gst_pad_peer_query (autoconvert->srcpad, query); } /** * gst_auto_convert_getcaps: * @pad: the sink #GstPad * * This function returns the union of the caps of all the possible element * factories, based on the static pad templates. * It also checks does a getcaps on the downstream element and ignores all * factories whose static caps can not satisfy it. * * It does not try to use each elements getcaps() function */ static GstCaps * gst_auto_convert_getcaps (GstAutoConvert * autoconvert, GstCaps * filter, GstPadDirection dir) { GstCaps *caps = NULL, *other_caps = NULL; GList *elem, *factories; caps = gst_caps_new_empty (); if (dir == GST_PAD_SINK) other_caps = gst_pad_peer_query_caps (autoconvert->srcpad, NULL); else other_caps = gst_pad_peer_query_caps (autoconvert->sinkpad, NULL); GST_DEBUG_OBJECT (autoconvert, "Lets find all the element that can fit here with src caps %" GST_PTR_FORMAT, other_caps); if (other_caps && gst_caps_is_empty (other_caps)) { goto out; } factories = g_atomic_pointer_get (&autoconvert->factories); if (!factories) factories = gst_auto_convert_load_factories (autoconvert); for (elem = factories; elem; elem = g_list_next (elem)) { GstElementFactory *factory = GST_ELEMENT_FACTORY (elem->data); GstElement *element = NULL; GstCaps *element_caps; GstPad *internal_pad = NULL; if (filter) { if (!factory_can_intersect (autoconvert, factory, dir, filter)) { GST_LOG_OBJECT (autoconvert, "Factory %s does not accept src caps %" GST_PTR_FORMAT, gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)), other_caps); continue; } } if (other_caps != NULL) { if (!factory_can_intersect (autoconvert, factory, dir == GST_PAD_SINK ? GST_PAD_SRC : GST_PAD_SINK, other_caps)) { GST_LOG_OBJECT (autoconvert, "Factory %s does not accept src caps %" GST_PTR_FORMAT, gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)), other_caps); continue; } element = gst_auto_convert_get_or_make_element_from_factory (autoconvert, factory); if (element == NULL) continue; if (dir == GST_PAD_SINK) internal_pad = g_object_get_qdata (G_OBJECT (element), internal_srcpad_quark); else internal_pad = g_object_get_qdata (G_OBJECT (element), internal_sinkpad_quark); element_caps = gst_pad_peer_query_caps (internal_pad, filter); if (element_caps) caps = gst_caps_merge (caps, element_caps); gst_object_unref (element); /* Early out, any is absorbing */ if (gst_caps_is_any (caps)) goto out; } else { const GList *tmp; for (tmp = gst_element_factory_get_static_pad_templates (factory); tmp; tmp = g_list_next (tmp)) { GstStaticPadTemplate *template = tmp->data; if (GST_PAD_TEMPLATE_DIRECTION (template) == dir) { GstCaps *static_caps = gst_static_pad_template_get_caps (template); if (static_caps) { caps = gst_caps_merge (caps, static_caps); } /* Early out, any is absorbing */ if (gst_caps_is_any (caps)) goto out; } } } } GST_DEBUG_OBJECT (autoconvert, "Returning unioned caps %" GST_PTR_FORMAT, caps); out: if (other_caps) gst_caps_unref (other_caps); return caps; } static gboolean gst_auto_convert_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean ret = TRUE; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); GstPad *internal_sinkpad; if (GST_EVENT_TYPE (event) == GST_EVENT_RECONFIGURE) gst_pad_push_event (autoconvert->sinkpad, gst_event_ref (event)); internal_sinkpad = gst_auto_convert_get_internal_sinkpad (autoconvert); if (internal_sinkpad) { ret = gst_pad_push_event (internal_sinkpad, event); gst_object_unref (internal_sinkpad); } else if (GST_EVENT_TYPE (event) != GST_EVENT_RECONFIGURE) { GST_WARNING_OBJECT (autoconvert, "Got upstream event while no element was selected," "forwarding."); ret = gst_pad_push_event (autoconvert->sinkpad, event); } else gst_event_unref (event); return ret; } /* TODO Properly test that this code works well for queries */ static gboolean gst_auto_convert_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { gboolean ret = TRUE; GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent); GstElement *subelement; if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) { GstCaps *filter, *caps; gst_query_parse_caps (query, &filter); caps = gst_auto_convert_getcaps (autoconvert, filter, GST_PAD_SRC); gst_query_set_caps_result (query, caps); gst_caps_unref (caps); return TRUE; } subelement = gst_auto_convert_get_subelement (autoconvert); if (subelement) { GstPad *sub_srcpad = get_pad_by_direction (subelement, GST_PAD_SRC); ret = gst_pad_query (sub_srcpad, query); gst_object_unref (sub_srcpad); gst_object_unref (subelement); } else { GST_WARNING_OBJECT (autoconvert, "Got upstream query of type %s while no element was selected," " forwarding.", gst_query_type_get_name (GST_QUERY_TYPE (query))); ret = gst_pad_peer_query (autoconvert->sinkpad, query); } return ret; } static GstFlowReturn gst_auto_convert_internal_sink_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); return gst_pad_push (autoconvert->srcpad, buffer); } static GstFlowReturn gst_auto_convert_internal_sink_chain_list (GstPad * pad, GstObject * parent, GstBufferList * list) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); return gst_pad_push_list (autoconvert->srcpad, list); } static gboolean gst_auto_convert_internal_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); gboolean drop = FALSE; GST_AUTOCONVERT_LOCK (autoconvert); if (autoconvert->current_internal_sinkpad != pad) { drop = TRUE; } GST_AUTOCONVERT_UNLOCK (autoconvert); if (drop) { gst_event_unref (event); return TRUE; } return gst_pad_push_event (autoconvert->srcpad, event); } static gboolean gst_auto_convert_internal_sink_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); if (!gst_pad_peer_query (autoconvert->srcpad, query)) { switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS: { GstCaps *filter; gst_query_parse_caps (query, &filter); if (filter) { gst_query_set_caps_result (query, filter); } else { filter = gst_caps_new_any (); gst_query_set_caps_result (query, filter); gst_caps_unref (filter); } return TRUE; } case GST_QUERY_ACCEPT_CAPS: gst_query_set_accept_caps_result (query, TRUE); return TRUE; default: return FALSE; } } return TRUE; } static gboolean gst_auto_convert_internal_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); gboolean drop = FALSE; GST_AUTOCONVERT_LOCK (autoconvert); if (autoconvert->current_internal_srcpad != pad) { drop = TRUE; } GST_AUTOCONVERT_UNLOCK (autoconvert); if (drop) { GST_DEBUG_OBJECT (autoconvert, "Dropping event %" GST_PTR_FORMAT, event); gst_event_unref (event); return TRUE; } return gst_pad_push_event (autoconvert->sinkpad, event); } static gboolean gst_auto_convert_internal_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstAutoConvert *autoconvert = GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad), parent_quark)); return gst_pad_peer_query (autoconvert->sinkpad, query); }