/* GStreamer * Copyright (C) <2006> Edward Hervey * * 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-decodebin2 * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "gstplay-marshal.h" /* generic templates */ static GstStaticPadTemplate decoder_bin_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate decoder_bin_src_template = GST_STATIC_PAD_TEMPLATE ("src%d", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug); #define GST_CAT_DEFAULT gst_decode_bin_debug typedef struct _GstDecodeGroup GstDecodeGroup; typedef struct _GstDecodePad GstDecodePad; typedef struct _GstDecodeBin GstDecodeBin; typedef struct _GstDecodeBinClass GstDecodeBinClass; #define GST_TYPE_DECODE_BIN (gst_decode_bin_get_type()) #define GST_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin)) #define GST_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass)) #define GST_IS_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN)) #define GST_IS_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN)) struct _GstDecodeBin { GstBin bin; /* we extend GstBin */ GstElement *typefind; /* this holds the typefind object */ GstElement *fakesink; GMutex *lock; /* Protects activegroup and groups */ GstDecodeGroup *activegroup; /* group currently active */ GList *groups; /* List of non-active GstDecodeGroups, sorted in * order of creation. */ gint nbpads; /* unique identifier for source pads */ GstCaps *caps; /* caps on which to stop decoding */ GList *factories; /* factories we can use for selecting elements */ }; struct _GstDecodeBinClass { GstBinClass parent_class; /* signal we fire when a new pad has been decoded into raw audio/video */ void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last); /* signal we fire when a pad has been removed */ void (*removed_decoded_pad) (GstElement * element, GstPad * pad); /* signal fired when we found a pad that we cannot decode */ void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps); /* signal fired to know if we continue trying to decode the given caps */ gboolean (*autoplug_continue) (GstElement * element, GstCaps * caps); /* signal fired to reorder the proposed list of factories */ gboolean (*autoplug_sort) (GstElement * element, GstCaps * caps, GList ** list); }; /* signals */ enum { SIGNAL_NEW_DECODED_PAD, SIGNAL_REMOVED_DECODED_PAD, SIGNAL_UNKNOWN_TYPE, SIGNAL_AUTOPLUG_CONTINUE, SIGNAL_AUTOPLUG_SORT, LAST_SIGNAL }; /* Properties */ enum { PROP_0, PROP_CAPS, }; static GstBinClass *parent_class; static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 }; static const GstElementDetails gst_decode_bin_details = GST_ELEMENT_DETAILS ("Decoder Bin", "Generic/Bin/Decoder", "Autoplug and decode to raw media", "Edward Hervey "); static void add_fakesink (GstDecodeBin * decode_bin); static void remove_fakesink (GstDecodeBin * decode_bin); static void type_found (GstElement * typefind, guint probability, GstCaps * caps, GstDecodeBin * decode_bin); static gboolean gst_decode_bin_autoplug_continue (GstElement * element, GstCaps * caps); static gboolean gst_decode_bin_autoplug_sort (GstElement * element, GstCaps * caps, GList ** list); static void gst_decode_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_decode_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps); static GstCaps *gst_decode_bin_get_caps (GstDecodeBin * dbin); static GstPad *find_sink_pad (GstElement * element); static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element, GstStateChange transition); #define DECODE_BIN_LOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "locking from thread %p", \ g_thread_self ()); \ g_mutex_lock (dbin->lock); \ GST_LOG_OBJECT (dbin, \ "locked from thread %p", \ g_thread_self ()); \ } G_STMT_END #define DECODE_BIN_UNLOCK(dbin) G_STMT_START { \ GST_LOG_OBJECT (dbin, \ "unlocking from thread %p", \ g_thread_self ()); \ g_mutex_unlock (dbin->lock); \ } G_STMT_END /* GstDecodeGroup * * Streams belonging to the same group/chain of a media file * */ struct _GstDecodeGroup { GstDecodeBin *dbin; GMutex *lock; GstElement *multiqueue; gboolean exposed; /* TRUE if this group is exposed */ gboolean drained; /* TRUE if EOS went throug all endpads */ gboolean blocked; /* TRUE if all endpads are blocked */ gboolean complete; /* TRUE if we are not expecting anymore streams * on this group */ GList *endpads; /* List of GstDecodePad of source pads to be exposed */ GList *ghosts; /* List of GstGhostPad for the endpads */ }; #define GROUP_MUTEX_LOCK(group) G_STMT_START { \ GST_LOG_OBJECT (group->dbin, \ "locking group %p from thread %p", \ group, g_thread_self ()); \ g_mutex_lock (group->lock); \ GST_LOG_OBJECT (group->dbin, \ "locked group %p from thread %p", \ group, g_thread_self ()); \ } G_STMT_END #define GROUP_MUTEX_UNLOCK(group) G_STMT_START { \ GST_LOG_OBJECT (group->dbin, \ "unlocking group %p from thread %p", \ group, g_thread_self ()); \ g_mutex_unlock (group->lock); \ } G_STMT_END static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * decode_bin); static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad); static gboolean gst_decode_group_control_source_pad (GstDecodeGroup * group, GstPad * pad); static gboolean gst_decode_group_expose (GstDecodeGroup * group); static void gst_decode_group_check_if_blocked (GstDecodeGroup * group); static void gst_decode_group_set_complete (GstDecodeGroup * group); static void gst_decode_group_hide (GstDecodeGroup * group); static void gst_decode_group_free (GstDecodeGroup * group); /* GstDecodePad * * GstPad private used for source pads of groups */ struct _GstDecodePad { GstPad *pad; GstDecodeGroup *group; gboolean blocked; gboolean drained; }; static GstDecodePad *gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad, gboolean block); static void source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad); /* TempPadStruct * Internal structure used for pads which have more than one structure. */ typedef struct _TempPadStruct { GstDecodeBin *dbin; GstDecodeGroup *group; } TempPadStruct; /******************************** * Standard GObject boilerplate * ********************************/ static void gst_decode_bin_class_init (GstDecodeBinClass * klass); static void gst_decode_bin_init (GstDecodeBin * decode_bin); static void gst_decode_bin_dispose (GObject * object); static void gst_decode_bin_finalize (GObject * object); static GType gst_decode_bin_get_type (void) { static GType gst_decode_bin_type = 0; if (!gst_decode_bin_type) { static const GTypeInfo gst_decode_bin_info = { sizeof (GstDecodeBinClass), NULL, NULL, (GClassInitFunc) gst_decode_bin_class_init, NULL, NULL, sizeof (GstDecodeBin), 0, (GInstanceInitFunc) gst_decode_bin_init, NULL }; gst_decode_bin_type = g_type_register_static (GST_TYPE_BIN, "GstDecodeBin2", &gst_decode_bin_info, 0); } return gst_decode_bin_type; } static gboolean _gst_boolean_accumulator (GSignalInvocationHint * ihint, GValue * return_accu, const GValue * handler_return, gpointer dummy) { gboolean myboolean; myboolean = g_value_get_boolean (handler_return); if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP)) g_value_set_boolean (return_accu, myboolean); /* stop emission if FALSE */ return myboolean; } static void gst_decode_bin_class_init (GstDecodeBinClass * klass) { GObjectClass *gobject_klass; GstElementClass *gstelement_klass; GstBinClass *gstbin_klass; gobject_klass = (GObjectClass *) klass; gstelement_klass = (GstElementClass *) klass; gstbin_klass = (GstBinClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose); gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_decode_bin_finalize); gobject_klass->set_property = GST_DEBUG_FUNCPTR (gst_decode_bin_set_property); gobject_klass->get_property = GST_DEBUG_FUNCPTR (gst_decode_bin_get_property); gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] = g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL, gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD, G_TYPE_BOOLEAN); gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] = g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD); gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] = g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type), NULL, NULL, gst_marshal_VOID__OBJECT_OBJECT, G_TYPE_NONE, 2, GST_TYPE_PAD, GST_TYPE_CAPS); gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] = g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_continue), _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT, G_TYPE_BOOLEAN, 1, GST_TYPE_CAPS); gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT] = g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, autoplug_sort), _gst_boolean_accumulator, NULL, gst_play_marshal_BOOLEAN__OBJECT_POINTER, G_TYPE_BOOLEAN, 2, GST_TYPE_CAPS, G_TYPE_POINTER); g_object_class_install_property (gobject_klass, PROP_CAPS, g_param_spec_boxed ("caps", "Caps", "The caps on which to stop decoding.", GST_TYPE_CAPS, G_PARAM_READWRITE)); klass->autoplug_continue = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_continue); klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_decode_bin_autoplug_sort); gst_element_class_add_pad_template (gstelement_klass, gst_static_pad_template_get (&decoder_bin_sink_template)); gst_element_class_add_pad_template (gstelement_klass, gst_static_pad_template_get (&decoder_bin_src_template)); gst_element_class_set_details (gstelement_klass, &gst_decode_bin_details); gstelement_klass->change_state = GST_DEBUG_FUNCPTR (gst_decode_bin_change_state); } /* the filter function for selecting the elements we can use in * autoplugging */ static gboolean gst_decode_bin_factory_filter (GstPluginFeature * feature, GstDecodeBin * decode_bin) { guint rank; const gchar *klass; /* we only care about element factories */ if (!GST_IS_ELEMENT_FACTORY (feature)) return FALSE; klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature)); /* only demuxers, decoders and parsers can play */ if (strstr (klass, "Demux") == NULL && strstr (klass, "Decoder") == NULL && strstr (klass, "Parse") == NULL) { return FALSE; } /* only select elements with autoplugging rank */ rank = gst_plugin_feature_get_rank (feature); if (rank < GST_RANK_MARGINAL) return FALSE; return TRUE; } /* function used to sort element features */ 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 void print_feature (GstPluginFeature * feature) { const gchar *rname; rname = gst_plugin_feature_get_name (feature); GST_DEBUG ("%s", rname); } static void gst_decode_bin_init (GstDecodeBin * decode_bin) { GList *factories; /* first filter out the interesting element factories */ factories = gst_default_registry_feature_filter ( (GstPluginFeatureFilter) gst_decode_bin_factory_filter, FALSE, decode_bin); /* sort them according to their ranks */ decode_bin->factories = g_list_sort (factories, (GCompareFunc) compare_ranks); /* do some debugging */ g_list_foreach (decode_bin->factories, (GFunc) print_feature, NULL); /* we create the typefind element only once */ decode_bin->typefind = gst_element_factory_make ("typefind", "typefind"); if (!decode_bin->typefind) { g_warning ("can't find typefind element, decodebin will not work"); } else { GstPad *pad; GstPad *gpad; /* add the typefind element */ if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) { g_warning ("Could not add typefind element, decodebin will not work"); gst_object_unref (decode_bin->typefind); decode_bin->typefind = NULL; } /* get the sinkpad */ pad = gst_element_get_pad (decode_bin->typefind, "sink"); /* ghost the sink pad to ourself */ gpad = gst_ghost_pad_new ("sink", pad); gst_pad_set_active (gpad, TRUE); gst_element_add_pad (GST_ELEMENT (decode_bin), gpad); gst_object_unref (pad); /* connect a signal to find out when the typefind element found * a type */ g_signal_connect (G_OBJECT (decode_bin->typefind), "have_type", G_CALLBACK (type_found), decode_bin); } decode_bin->lock = g_mutex_new (); decode_bin->activegroup = NULL; decode_bin->groups = NULL; decode_bin->caps = gst_caps_from_string ("video/x-raw-yuv;video/x-raw-rgb;video/x-raw-gray;" "audio/x-raw-int;audio/x-raw-float;" "text/plain;text/x-pango-markup"); add_fakesink (decode_bin); /* FILLME */ } static void gst_decode_bin_dispose (GObject * object) { GstDecodeBin *decode_bin; decode_bin = GST_DECODE_BIN (object); if (decode_bin->factories) gst_plugin_feature_list_free (decode_bin->factories); decode_bin->factories = NULL; /* FILLME */ if (decode_bin->caps) gst_caps_unref (decode_bin->caps); decode_bin->caps = NULL; remove_fakesink (decode_bin); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_decode_bin_finalize (GObject * object) { /* FILLME */ G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_decode_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstDecodeBin *dbin; dbin = GST_DECODE_BIN (object); switch (prop_id) { case PROP_CAPS: gst_decode_bin_set_caps (dbin, (GstCaps *) g_value_dup_boxed (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_decode_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstDecodeBin *dbin; dbin = GST_DECODE_BIN (object); switch (prop_id) { case PROP_CAPS:{ g_value_take_boxed (value, gst_decode_bin_get_caps (dbin)); break; } default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* _set_caps * Changes the caps on which decodebin will stop decoding. * Will unref the previously set one. The refcount of the given caps will be * taken. * @caps can be NULL. * * MT-safe */ static void gst_decode_bin_set_caps (GstDecodeBin * dbin, GstCaps * caps) { GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps); DECODE_BIN_LOCK (dbin); if (dbin->caps) gst_caps_unref (dbin->caps); dbin->caps = caps; DECODE_BIN_UNLOCK (dbin); } /* _get_caps * Returns the currently configured caps on which decodebin will stop decoding. * The returned caps (if not NULL), will have its refcount incremented. * * MT-safe */ static GstCaps * gst_decode_bin_get_caps (GstDecodeBin * dbin) { GstCaps *caps; GST_DEBUG_OBJECT (dbin, "Getting currently set caps"); DECODE_BIN_LOCK (dbin); caps = dbin->caps; if (caps) gst_caps_ref (caps); DECODE_BIN_UNLOCK (dbin); return caps; } /***** * Default autoplug signal handlers *****/ static gboolean gst_decode_bin_autoplug_continue (GstElement * element, GstCaps * caps) { return TRUE; } static gboolean gst_decode_bin_autoplug_sort (GstElement * element, GstCaps * caps, GList ** list) { return TRUE; } /******** * Discovery methods *****/ static gboolean are_raw_caps (GstDecodeBin * dbin, GstCaps * caps); static gboolean is_demuxer_element (GstElement * srcelement); static GList *find_compatibles (GstDecodeBin * decode_bin, const GstCaps * caps); static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GList * factories, GstDecodeGroup * group); static gboolean connect_element (GstDecodeBin * dbin, GstElement * element, GstDecodeGroup * group); static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GstDecodeGroup * group); static void pad_added_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group); static void pad_removed_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group); static void no_more_pads_group_cb (GstElement * element, GstDecodeGroup * group); static void pad_added_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin); static void pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin); static void no_more_pads_cb (GstElement * element, GstDecodeBin * dbin); static GstDecodeGroup *get_current_group (GstDecodeBin * dbin); static void analyze_new_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GstCaps * caps, GstDecodeGroup * group) { gboolean apcontinue = TRUE; GList *factories = NULL; gboolean apsort = TRUE; GST_DEBUG_OBJECT (dbin, "Pad %s:%s caps:%" GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (pad), caps); if ((caps == NULL) || gst_caps_is_empty (caps)) goto unknown_type; if (gst_caps_is_any (caps)) goto any_caps; /* 1. Emit 'autoplug-continue' */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, caps, &apcontinue); /* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */ if ((!apcontinue) || are_raw_caps (dbin, caps)) goto expose_pad; /* 1.b else if there's no compatible factory or 'autoplug-sort' returned FALSE, goto pad_not_used */ if ((factories = find_compatibles (dbin, caps))) { /* emit autoplug-sort */ g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, caps, &factories, &apsort); if (!apsort) { g_list_free (factories); /* User doesn't want that pad */ goto pad_not_wanted; } } else { /* no compatible factories */ goto unknown_type; } /* 1.c else goto pad_is_valid */ GST_LOG_OBJECT (pad, "Let's continue discovery on this pad"); connect_pad (dbin, src, pad, factories, group); g_list_free (factories); return; expose_pad: { GST_LOG_OBJECT (dbin, "Pad is final. autoplug-continue:%d", apcontinue); expose_pad (dbin, src, pad, group); return; } pad_not_wanted: { GST_LOG_OBJECT (pad, "User doesn't want this pad, stopping discovery"); return; } unknown_type: { GST_LOG_OBJECT (pad, "Unknown type, firing signal"); g_signal_emit (G_OBJECT (dbin), gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps); /* Check if there are no pending groups, if so, remove fakesink */ if (dbin->groups == NULL) remove_fakesink (dbin); return; } any_caps: { GST_WARNING_OBJECT (pad, "pad has ANY caps, not able to autoplug to anything"); /* FIXME : connect to caps notification */ return; } } /** connect_pad: * * Try to connect the given pad to an element created from one of the factories, * and recursively. * * Returns TRUE if an element was properly created and linked */ static gboolean connect_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GList * factories, GstDecodeGroup * group) { gboolean res = FALSE; GList *tmp; g_return_val_if_fail (factories != NULL, FALSE); GST_DEBUG_OBJECT (dbin, "pad %s:%s , group:%p", GST_DEBUG_PAD_NAME (pad), group); /* 1. is element demuxer or parser */ if (is_demuxer_element (src)) { GstPad *mqpad; GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue"); if (!group) if (!(group = get_current_group (dbin))) { group = gst_decode_group_new (dbin); DECODE_BIN_LOCK (dbin); dbin->groups = g_list_append (dbin->groups, group); DECODE_BIN_UNLOCK (dbin); } if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad))) goto beach; pad = mqpad; } /* 2. Try to create an element and link to it */ for (tmp = factories; tmp; tmp = g_list_next (tmp)) { GstElementFactory *factory = (GstElementFactory *) tmp->data; GstElement *element; GstPad *sinkpad; /* 2.1. Try to create an element */ if ((element = gst_element_factory_create (factory, NULL)) == NULL) { GST_WARNING_OBJECT (dbin, "Could not create an element from %s", gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory))); continue; } /* 2.3. Find its sink pad */ if (!(sinkpad = find_sink_pad (element))) { GST_WARNING_OBJECT (dbin, "Element %s doesn't have a sink pad", GST_ELEMENT_NAME (element)); gst_object_unref (element); continue; } /* 2.4 add it ... */ if (!(gst_bin_add (GST_BIN (dbin), element))) { GST_WARNING_OBJECT (dbin, "Couldn't add %s to the bin", GST_ELEMENT_NAME (element)); gst_object_unref (sinkpad); gst_object_unref (element); continue; } /* ... activate it ... */ if ((gst_element_set_state (element, GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) { GST_WARNING_OBJECT (dbin, "Couldn't set %s to READY", GST_ELEMENT_NAME (element)); gst_object_unref (sinkpad); gst_bin_remove (GST_BIN (dbin), element); continue; } /* 2.5 ...and try to link */ if ((gst_pad_link (pad, sinkpad)) != GST_PAD_LINK_OK) { GST_WARNING_OBJECT (dbin, "Link failed on pad %s:%s", GST_DEBUG_PAD_NAME (sinkpad)); gst_element_set_state (element, GST_STATE_NULL); gst_object_unref (sinkpad); gst_bin_remove (GST_BIN (dbin), element); continue; } GST_LOG_OBJECT (dbin, "linked on pad %s:%s", GST_DEBUG_PAD_NAME (pad)); /* link this element further */ connect_element (dbin, element, group); /* Bring the element to the state of the parent */ if ((gst_element_set_state (element, GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) { GST_WARNING_OBJECT (dbin, "Couldn't set %s to PAUSED", GST_ELEMENT_NAME (element)); gst_element_set_state (element, GST_STATE_NULL); gst_object_unref (sinkpad); gst_bin_remove (GST_BIN (dbin), element); continue; } res = TRUE; break; } beach: return res; } static gboolean connect_element (GstDecodeBin * dbin, GstElement * element, GstDecodeGroup * group) { GList *pads; gboolean res = TRUE; gboolean dynamic = FALSE; GList *to_connect = NULL; GST_DEBUG_OBJECT (dbin, "Attempting to connect element %s [group:%p] further", GST_ELEMENT_NAME (element), group); /* 1. Loop over pad templates, grabbing existing pads along the way */ for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads; pads = g_list_next (pads)) { GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data); const gchar *templ_name; /* we are only interested in source pads */ if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC) continue; templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ); GST_DEBUG_OBJECT (dbin, "got a source pad template %s", templ_name); /* figure out what kind of pad this is */ switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { case GST_PAD_ALWAYS: { /* get the pad that we need to autoplug */ GstPad *pad = gst_element_get_pad (element, templ_name); if (pad) { GST_DEBUG_OBJECT (dbin, "got the pad for always template %s", templ_name); /* here is the pad, we need to autoplug it */ to_connect = g_list_prepend (to_connect, pad); } else { /* strange, pad is marked as always but it's not * there. Fix the element */ GST_WARNING_OBJECT (dbin, "could not get the pad for always template %s", templ_name); } break; } case GST_PAD_SOMETIMES: { /* try to get the pad to see if it is already created or * not */ GstPad *pad = gst_element_get_pad (element, templ_name); if (pad) { GST_DEBUG_OBJECT (dbin, "got the pad for sometimes template %s", templ_name); /* the pad is created, we need to autoplug it */ to_connect = g_list_prepend (to_connect, pad); } else { GST_DEBUG_OBJECT (dbin, "did not get the sometimes pad of template %s", templ_name); /* we have an element that will create dynamic pads */ dynamic = TRUE; } break; } case GST_PAD_REQUEST: /* ignore request pads */ GST_DEBUG_OBJECT (dbin, "ignoring request padtemplate %s", templ_name); break; } } /* 2. if there are more potential pads, connect to relevent signals */ if (dynamic) { if (group) { g_signal_connect (G_OBJECT (element), "pad-added", G_CALLBACK (pad_added_group_cb), group); g_signal_connect (G_OBJECT (element), "pad-removed", G_CALLBACK (pad_removed_group_cb), group); g_signal_connect (G_OBJECT (element), "no-more-pads", G_CALLBACK (no_more_pads_group_cb), group); } else { /* This is a non-grouped element, the handlers are different */ g_signal_connect (G_OBJECT (element), "pad-added", G_CALLBACK (pad_added_cb), dbin); g_signal_connect (G_OBJECT (element), "pad-removed", G_CALLBACK (pad_removed_cb), dbin); g_signal_connect (G_OBJECT (element), "no-more-pads", G_CALLBACK (no_more_pads_cb), dbin); } } /* 3. for every available pad, connect it */ for (pads = to_connect; pads; pads = g_list_next (pads)) { GstPad *pad = GST_PAD_CAST (pads->data); GstCaps *caps; caps = gst_pad_get_caps (pad); analyze_new_pad (dbin, element, pad, caps, group); if (caps) gst_caps_unref (caps); gst_object_unref (pad); } g_list_free (to_connect); return res; } /* expose_pad: * * Expose the given pad on the group as a decoded pad. * If group is NULL, a GstDecodeGroup will be created and setup properly. */ static void expose_pad (GstDecodeBin * dbin, GstElement * src, GstPad * pad, GstDecodeGroup * group) { gboolean newgroup = FALSE; gboolean isdemux; GST_DEBUG_OBJECT (dbin, "pad %s:%s, group:%p", GST_DEBUG_PAD_NAME (pad), group); if (!group) if (!(group = get_current_group (dbin))) { group = gst_decode_group_new (dbin); DECODE_BIN_LOCK (dbin); dbin->groups = g_list_append (dbin->groups, group); DECODE_BIN_UNLOCK (dbin); newgroup = TRUE; } isdemux = is_demuxer_element (src); if (isdemux || newgroup) { GstPad *mqpad; GST_LOG_OBJECT (src, "is a demuxer, connecting the pad through multiqueue"); if (!(mqpad = gst_decode_group_control_demuxer_pad (group, pad))) goto beach; pad = mqpad; } gst_decode_group_control_source_pad (group, pad); if (newgroup && !isdemux) { /* If we have discovered a raw pad and it doesn't belong to any group, * that means there wasn't any demuxer. In that case, we consider the * group as being complete. */ gst_decode_group_set_complete (group); } beach: return; } static void type_found (GstElement * typefind, guint probability, GstCaps * caps, GstDecodeBin * decode_bin) { GstPad *pad; GST_STATE_LOCK (decode_bin); GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT, caps); pad = gst_element_get_pad (typefind, "src"); analyze_new_pad (decode_bin, typefind, pad, caps, NULL); gst_object_unref (pad); GST_STATE_UNLOCK (decode_bin); return; } static void pad_added_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group) { GST_LOG_OBJECT (pad, "pad added, group:%p", group); /* FIXME : FILLME */ } static void pad_removed_group_cb (GstElement * element, GstPad * pad, GstDecodeGroup * group) { GST_LOG_OBJECT (pad, "pad removed, group:%p", group); /* In fact, we don't have to do anything here, the active group will be * removed when the group's multiqueue is drained */ } static void no_more_pads_group_cb (GstElement * element, GstDecodeGroup * group) { GST_LOG_OBJECT (element, "no more pads, setting group %p to complete", group); /* FIXME : FILLME */ gst_decode_group_set_complete (group); } static void pad_added_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin) { GstCaps *caps; GST_LOG_OBJECT (pad, "Pad added to non-grouped element"); caps = gst_pad_get_caps (pad); analyze_new_pad (dbin, element, pad, caps, NULL); if (caps) gst_caps_unref (caps); } static void pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeBin * dbin) { GST_LOG_OBJECT (pad, "Pad removed from non-grouped element"); } static void no_more_pads_cb (GstElement * element, GstDecodeBin * dbin) { GstDecodeGroup *group; GST_LOG_OBJECT (element, "No more pads, setting current group to complete"); /* Find the non-complete group, there should only be one */ if (!(group = get_current_group (dbin))) goto no_group; gst_decode_group_set_complete (group); return; no_group: { GST_WARNING_OBJECT (dbin, "We couldn't find a non-completed group !!"); return; } } /* this function runs through the element factories and returns a list * of all elements that are able to sink the given caps */ static GList * find_compatibles (GstDecodeBin * decode_bin, const GstCaps * caps) { GList *factories; GList *to_try = NULL; /* loop over all the factories */ for (factories = decode_bin->factories; factories; factories = g_list_next (factories)) { GstElementFactory *factory = GST_ELEMENT_FACTORY (factories->data); const GList *templates; GList *walk; /* get the templates from the element factory */ templates = gst_element_factory_get_static_pad_templates (factory); for (walk = (GList *) templates; walk; walk = g_list_next (walk)) { GstStaticPadTemplate *templ = walk->data; /* we only care about the sink templates */ if (templ->direction == GST_PAD_SINK) { GstCaps *intersect; GstCaps *tmpl_caps; /* try to intersect the caps with the caps of the template */ tmpl_caps = gst_static_caps_get (&templ->static_caps); intersect = gst_caps_intersect (caps, tmpl_caps); gst_caps_unref (tmpl_caps); /* check if the intersection is empty */ if (!gst_caps_is_empty (intersect)) { /* non empty intersection, we can use this element */ to_try = g_list_prepend (to_try, factory); gst_caps_unref (intersect); break; } gst_caps_unref (intersect); } } } to_try = g_list_reverse (to_try); return to_try; } /* Decide whether an element is a demuxer based on the * klass and number/type of src pad templates it has */ static gboolean is_demuxer_element (GstElement * srcelement) { GstElementFactory *srcfactory; GstElementClass *elemclass; GList *templates, *walk; const gchar *klass; gint potential_src_pads = 0; srcfactory = gst_element_get_factory (srcelement); klass = gst_element_factory_get_klass (srcfactory); /* Can't be a demuxer unless it has Demux in the klass name */ if (!strstr (klass, "Demux")) return FALSE; /* Walk the src pad templates and count how many the element * might produce */ elemclass = GST_ELEMENT_GET_CLASS (srcelement); walk = templates = gst_element_class_get_pad_template_list (elemclass); while (walk != NULL) { GstPadTemplate *templ; templ = (GstPadTemplate *) walk->data; if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) { switch (GST_PAD_TEMPLATE_PRESENCE (templ)) { case GST_PAD_ALWAYS: case GST_PAD_SOMETIMES: if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%")) potential_src_pads += 2; /* Might make multiple pads */ else potential_src_pads += 1; break; case GST_PAD_REQUEST: potential_src_pads += 2; break; } } walk = g_list_next (walk); } if (potential_src_pads < 2) return FALSE; return TRUE; } /* Returns TRUE if the caps are raw, or if they are compatible with the caps * specified in the 'caps' property * * The decodebin_lock should be taken ! */ static gboolean are_raw_caps (GstDecodeBin * dbin, GstCaps * caps) { GstCaps *intersection; gboolean res; GST_LOG_OBJECT (dbin, "Checking with caps %" GST_PTR_FORMAT, caps); intersection = gst_caps_intersect (dbin->caps, caps); res = (!(gst_caps_is_empty (intersection))); gst_caps_unref (intersection); GST_LOG_OBJECT (dbin, "Caps are %sfinal caps", res ? "" : "not "); return res; } /**** * GstDecodeGroup functions ****/ static void multi_queue_overrun_cb (GstElement * queue, GstDecodeGroup * group) { GST_LOG_OBJECT (group->dbin, "multiqueue is full"); /* if we haven't exposed the group, do it */ DECODE_BIN_LOCK (group->dbin); gst_decode_group_expose (group); DECODE_BIN_UNLOCK (group->dbin); } static void multi_queue_underrun_cb (GstElement * queue, GstDecodeGroup * group) { GstDecodeBin *dbin = group->dbin; GST_LOG_OBJECT (dbin, "multiqueue is empty for group %p", group); /* Check if we need to activate another group */ DECODE_BIN_LOCK (dbin); if ((group == dbin->activegroup) && dbin->groups) { GST_DEBUG_OBJECT (dbin, "Switching to new group"); /* unexpose current active */ gst_decode_group_hide (group); gst_decode_group_free (group); /* expose first group of groups */ gst_decode_group_expose ((GstDecodeGroup *) dbin->groups->data); } DECODE_BIN_UNLOCK (dbin); } /* gst_decode_group_new * * Creates a new GstDecodeGroup. It is up to the caller to add it to the list * of groups. */ static GstDecodeGroup * gst_decode_group_new (GstDecodeBin * dbin) { GstDecodeGroup *group; GstElement *mq; GST_LOG_OBJECT (dbin, "Creating new group"); if (!(mq = gst_element_factory_make ("multiqueue", NULL))) { GST_WARNING ("Couldn't create multiqueue element"); return NULL; } g_object_set (G_OBJECT (mq), "max-size-bytes", 1 * 1024 * 1024, "max-size-time", G_GINT64_CONSTANT (0), "max-size-buffers", 0, NULL); group = g_new0 (GstDecodeGroup, 1); group->lock = g_mutex_new (); group->dbin = dbin; group->multiqueue = mq; group->exposed = FALSE; group->drained = FALSE; group->blocked = FALSE; group->complete = FALSE; group->endpads = NULL; g_signal_connect (G_OBJECT (mq), "overrun", G_CALLBACK (multi_queue_overrun_cb), group); g_signal_connect (G_OBJECT (mq), "underrun", G_CALLBACK (multi_queue_underrun_cb), group); gst_bin_add (GST_BIN (dbin), group->multiqueue); gst_element_set_state (group->multiqueue, GST_STATE_PAUSED); GST_LOG_OBJECT (dbin, "Returning new group %p", group); return group; } /** get_current_group: * * Returns the current non-completed group. * * Returns NULL if no groups are available, or all groups are completed. */ static GstDecodeGroup * get_current_group (GstDecodeBin * dbin) { GList *tmp; GstDecodeGroup *group = NULL; DECODE_BIN_LOCK (dbin); for (tmp = dbin->groups; tmp; tmp = g_list_next (tmp)) { GstDecodeGroup *this = (GstDecodeGroup *) tmp->data; if (!this->complete) { group = this; break; } } DECODE_BIN_UNLOCK (dbin); GST_LOG_OBJECT (dbin, "Returning group %p", group); return group; } static gboolean group_demuxer_event_probe (GstPad * pad, GstEvent * event, GstDecodeGroup * group) { if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { GST_DEBUG_OBJECT (group->dbin, "Got EOS on group input pads, exposing group if it wasn't before"); gst_decode_group_expose (group); } return TRUE; } /* gst_decode_group_control_demuxer_pad * * Adds a new demuxer srcpad to the given group. * * Returns the srcpad of the multiqueue corresponding the given pad. * Returns NULL if there was an error. */ static GstPad * gst_decode_group_control_demuxer_pad (GstDecodeGroup * group, GstPad * pad) { GstPad *srcpad, *sinkpad; gchar *nb, *sinkname, *srcname; GST_LOG ("group:%p pad %s:%s", group, GST_DEBUG_PAD_NAME (pad)); srcpad = NULL; if (!(sinkpad = gst_element_get_pad (group->multiqueue, "sink%d"))) { GST_ERROR ("Couldn't get sinkpad from multiqueue"); return NULL; } if ((gst_pad_link (pad, sinkpad) != GST_PAD_LINK_OK)) { GST_ERROR ("Couldn't link demuxer and multiqueue"); goto beach; } sinkname = gst_pad_get_name (sinkpad); nb = sinkname + 4; srcname = g_strdup_printf ("src%s", nb); g_free (sinkname); GROUP_MUTEX_LOCK (group); if (!(srcpad = gst_element_get_pad (group->multiqueue, srcname))) { GST_ERROR ("Couldn't get srcpad %s from multiqueue", srcname); goto chiringuito; } /* connect event handler on pad to intercept EOS events */ gst_pad_add_event_probe (pad, G_CALLBACK (group_demuxer_event_probe), group); chiringuito: g_free (srcname); GROUP_MUTEX_UNLOCK (group); beach: gst_object_unref (sinkpad); return srcpad; } static gboolean gst_decode_group_control_source_pad (GstDecodeGroup * group, GstPad * pad) { GstDecodePad *dpad; g_return_val_if_fail (group != NULL, FALSE); GST_LOG ("group:%p , pad %s:%s", group, GST_DEBUG_PAD_NAME (pad)); /* FIXME : check if pad is already controlled */ GROUP_MUTEX_LOCK (group); /* Create GstDecodePad for the pad */ dpad = gst_decode_pad_new (group, pad, TRUE); group->endpads = g_list_append (group->endpads, dpad); GROUP_MUTEX_UNLOCK (group); return TRUE; } /* gst_decode_group_check_if_blocked: * * Call this when one of the pads blocked status has changed. * If the group is complete and blocked, the group will be marked as blocked * and will ghost/expose all pads on decodebin if the group is the current one. */ static void gst_decode_group_check_if_blocked (GstDecodeGroup * group) { GList *tmp; gboolean blocked = TRUE; GST_LOG ("group : %p", group); /* 1. don't do anything if group is not complete */ if (!group->complete) { GST_DEBUG_OBJECT (group->dbin, "Group isn't complete yet"); return; } for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; if (!dpad->blocked) { blocked = FALSE; break; } } /* 2. Update status of group */ group->blocked = blocked; GST_LOG ("group is blocked:%d", blocked); /* 3. don't do anything if not blocked completely */ if (!blocked) return; /* 4. if we're the current group, expose pads */ DECODE_BIN_LOCK (group->dbin); if (!gst_decode_group_expose (group)) GST_WARNING_OBJECT (group->dbin, "Couldn't expose group"); DECODE_BIN_UNLOCK (group->dbin); } static void gst_decode_group_check_if_drained (GstDecodeGroup * group) { GList *tmp; GstDecodeBin *dbin = group->dbin; gboolean drained = TRUE; GST_LOG ("group : %p", group); for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; GST_LOG ("testing dpad %p", dpad); if (!dpad->drained) { drained = FALSE; break; } } group->drained = drained; GST_LOG ("group is drained"); if (!drained) return; DECODE_BIN_LOCK (dbin); if ((group == dbin->activegroup) && dbin->groups) { GST_DEBUG_OBJECT (dbin, "Switching to new group"); gst_decode_group_hide (group); gst_decode_group_free (group); gst_decode_group_expose ((GstDecodeGroup *) dbin->groups->data); } DECODE_BIN_UNLOCK (dbin); } /* gst_decode_group_expose: * * Expose this group's pads. * * Not MT safe, please take the group lock */ static gboolean gst_decode_group_expose (GstDecodeGroup * group) { GList *tmp; GList *next = NULL; if (group->dbin->activegroup) { GST_DEBUG_OBJECT (group->dbin, "A group is already active and exposed"); DECODE_BIN_UNLOCK (group->dbin); return TRUE; } if (group->dbin->activegroup == group) { GST_WARNING ("Group %p is already exposed", group); DECODE_BIN_UNLOCK (group->dbin); return TRUE; } if (!group->dbin->groups || (group != (GstDecodeGroup *) group->dbin->groups->data)) { GST_WARNING ("Group %p is not the first group to expose", group); DECODE_BIN_UNLOCK (group->dbin); return FALSE; } GST_LOG ("Exposing group %p", group); /* Expose pads */ for (tmp = group->endpads; tmp; tmp = next) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; gchar *padname; GstPad *ghost; next = g_list_next (tmp); /* 1. ghost pad */ padname = g_strdup_printf ("src%d", group->dbin->nbpads); group->dbin->nbpads++; GST_LOG_OBJECT (group->dbin, "About to expose pad %s:%s", GST_DEBUG_PAD_NAME (dpad->pad)); ghost = gst_ghost_pad_new (padname, dpad->pad); gst_pad_set_active (ghost, TRUE); gst_element_add_pad (GST_ELEMENT (group->dbin), ghost); group->ghosts = g_list_append (group->ghosts, ghost); g_free (padname); /* 2. emit signal */ GST_DEBUG_OBJECT (group->dbin, "emitting new-decoded-pad"); g_signal_emit (G_OBJECT (group->dbin), gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, ghost, (next == NULL)); GST_DEBUG_OBJECT (group->dbin, "emitted new-decoded-pad"); /* 3. Unblock internal pad */ GST_DEBUG_OBJECT (dpad->pad, "unblocking"); gst_pad_set_blocked_async (dpad->pad, FALSE, (GstPadBlockCallback) source_pad_blocked_cb, dpad); GST_DEBUG_OBJECT (dpad->pad, "unblocked"); } group->dbin->activegroup = group; /* pop off the first group */ group->dbin->groups = g_list_delete_link (group->dbin->groups, group->dbin->groups); remove_fakesink (group->dbin); group->exposed = TRUE; GST_LOG_OBJECT (group->dbin, "Group %p exposed", group); return TRUE; } static void gst_decode_group_hide (GstDecodeGroup * group) { GList *tmp; GST_LOG ("Hiding group %p", group); if (group != group->dbin->activegroup) { GST_WARNING ("This group is not the active one, aborting"); return; } GROUP_MUTEX_LOCK (group); /* Remove ghost pads */ for (tmp = group->ghosts; tmp; tmp = g_list_next (tmp)) gst_element_remove_pad (GST_ELEMENT (group->dbin), (GstPad *) tmp->data); g_list_free (group->ghosts); group->ghosts = NULL; group->exposed = FALSE; GROUP_MUTEX_UNLOCK (group); group->dbin->activegroup = NULL; } static void gst_decode_group_free (GstDecodeGroup * group) { GList *tmp; GST_LOG ("group %p", group); GROUP_MUTEX_LOCK (group); /* Clear all GstDecodePad */ for (tmp = group->endpads; tmp; tmp = g_list_next (tmp)) { GstDecodePad *dpad = (GstDecodePad *) tmp->data; g_free (dpad); } g_list_free (group->endpads); group->endpads = NULL; GROUP_MUTEX_UNLOCK (group); g_free (group->lock); g_free (group); } /* gst_decode_group_set_complete: * * Mark the group as complete. This means no more streams will be controlled * through this group. * * MT safe */ static void gst_decode_group_set_complete (GstDecodeGroup * group) { GST_LOG_OBJECT (group->dbin, "Setting group %p to COMPLETE", group); GROUP_MUTEX_LOCK (group); group->complete = TRUE; gst_decode_group_check_if_blocked (group); GROUP_MUTEX_UNLOCK (group); } /************************* * GstDecodePad functions *************************/ static void source_pad_blocked_cb (GstPad * pad, gboolean blocked, GstDecodePad * dpad) { GST_LOG_OBJECT (pad, "blocked:%d , dpad:%p, dpad->group:%p", blocked, dpad, dpad->group); /* Update this GstDecodePad status */ dpad->blocked = blocked; if (blocked) { GROUP_MUTEX_LOCK (dpad->group); gst_decode_group_check_if_blocked (dpad->group); GROUP_MUTEX_UNLOCK (dpad->group); } } static gboolean source_pad_event_probe (GstPad * pad, GstEvent * event, GstDecodePad * dpad) { GST_LOG_OBJECT (pad, "%s dpad:%p", GST_EVENT_TYPE_NAME (event), dpad); if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { /* Set our pad as drained */ dpad->drained = TRUE; /* Check if all pads are drained */ gst_decode_group_check_if_drained (dpad->group); } return TRUE; } /** gst_decode_pad_new: * * Creates a new GstDecodePad for the given pad. * If block is TRUE, Sets the pad blocking asynchronously */ static GstDecodePad * gst_decode_pad_new (GstDecodeGroup * group, GstPad * pad, gboolean block) { GstDecodePad *dpad; dpad = g_new0 (GstDecodePad, 1); dpad->pad = pad; dpad->group = group; dpad->blocked = FALSE; dpad->drained = TRUE; if (block) gst_pad_set_blocked_async (pad, TRUE, (GstPadBlockCallback) source_pad_blocked_cb, dpad); gst_pad_add_event_probe (pad, G_CALLBACK (source_pad_event_probe), dpad); return dpad; } /***** * Element add/remove *****/ /* * add_fakesink / remove_fakesink * * We use a sink so that the parent ::change_state returns GST_STATE_CHANGE_ASYNC * when that sink is present (since it's not connected to anything it will * always return GST_STATE_CHANGE_ASYNC). * * But this is an ugly way of achieving this goal. * Ideally, we shouldn't use a sink and just return GST_STATE_CHANGE_ASYNC in * our ::change_state if we have not exposed the active group. * We also need to override ::get_state to fake the asynchronous behaviour. * Once the active group is exposed, we would then post a * GST_MESSAGE_STATE_DIRTY and return GST_STATE_CHANGE_SUCCESS (which will call * ::get_state . */ static void add_fakesink (GstDecodeBin * decode_bin) { GST_DEBUG_OBJECT (decode_bin, "Adding the fakesink"); if (decode_bin->fakesink) return; decode_bin->fakesink = gst_element_factory_make ("fakesink", "async-fakesink"); if (!decode_bin->fakesink) goto no_fakesink; /* hacky, remove sink flag, we don't want our decodebin to become a sink * just because we add a fakesink element to make us ASYNC */ GST_OBJECT_FLAG_UNSET (decode_bin->fakesink, GST_ELEMENT_IS_SINK); if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->fakesink)) goto could_not_add; return; /* ERRORS */ no_fakesink: { g_warning ("can't find fakesink element, decodebin will not work"); return; } could_not_add: { g_warning ("Could not add fakesink to decodebin, decodebin will not work"); gst_object_unref (decode_bin->fakesink); decode_bin->fakesink = NULL; return; } } static void remove_fakesink (GstDecodeBin * decode_bin) { if (decode_bin->fakesink == NULL) return; GST_DEBUG_OBJECT (decode_bin, "Removing the fakesink"); gst_element_set_state (decode_bin->fakesink, GST_STATE_NULL); gst_bin_remove (GST_BIN (decode_bin), decode_bin->fakesink); decode_bin->fakesink = NULL; gst_element_post_message (GST_ELEMENT_CAST (decode_bin), gst_message_new_state_dirty (GST_OBJECT_CAST (decode_bin))); } /***** * convenience functions *****/ /** find_sink_pad * * Returns the first sink pad of the given element, or NULL if it doesn't have * any. */ static GstPad * find_sink_pad (GstElement * element) { GstIterator *it; GstPad *pad = NULL; gpointer point; it = gst_element_iterate_sink_pads (element); if ((gst_iterator_next (it, &point)) == GST_ITERATOR_OK) pad = (GstPad *) point; gst_iterator_free (it); return pad; } static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret; GstDecodeBin *dbin = GST_DECODE_BIN (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: /* catch fatal errors that may have occured in the init function */ if (dbin->typefind == NULL || dbin->fakesink == NULL) { GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL), (NULL)); return GST_STATE_CHANGE_FAILURE; } break; case GST_STATE_CHANGE_READY_TO_PAUSED:{ add_fakesink (dbin); break; } default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); /* FIXME : put some cleanup functions here.. if needed */ return ret; } static gboolean plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin2", 0, "decoder bin"); return gst_element_register (plugin, "decodebin2", GST_RANK_NONE, GST_TYPE_DECODE_BIN); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "decodebin2", "decoder bin newer version", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)