/* GStreamer input selector * Copyright (C) 2003 Julien Moutte * Copyright (C) 2005 Ronald S. Bultje * Copyright (C) 2005 Jan Schmidt * Copyright (C) 2007 Wim Taymans * Copyright (C) 2007 Andy Wingo * Copyright (C) 2008 Nokia Corporation. (contact ) * Copyright (C) 2011 Sebastian Dröge * * 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-input-selector * @see_also: #GstOutputSelector * * Direct one out of N input streams to the output pad. * * The input pads are from a GstPad subclass and have additional * properties, which users may find useful, namely: * * * * "running-time": Running time of stream on pad (#gint64) * * * "tags": The currently active tags on the pad (#GstTagList, boxed type) * * * "active": If the pad is currently active (#gboolean) * * * "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of * #GST_FLOW_NOT_LINKED * * * * Since: 0.10.32 */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstinputselector.h" GST_DEBUG_CATEGORY_STATIC (input_selector_debug); #define GST_CAT_DEFAULT input_selector_debug #if GLIB_CHECK_VERSION(2, 26, 0) #define NOTIFY_MUTEX_LOCK() #define NOTIFY_MUTEX_UNLOCK() #else static GStaticRecMutex notify_mutex = G_STATIC_REC_MUTEX_INIT; #define NOTIFY_MUTEX_LOCK() g_static_rec_mutex_lock (¬ify_mutex) #define NOTIFY_MUTEX_UNLOCK() g_static_rec_mutex_unlock (¬ify_mutex) #endif #define GST_INPUT_SELECTOR_GET_LOCK(sel) (((GstInputSelector*)(sel))->lock) #define GST_INPUT_SELECTOR_GET_COND(sel) (((GstInputSelector*)(sel))->cond) #define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel))) #define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel))) #define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \ GST_INPUT_SELECTOR_GET_LOCK(sel))) #define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel))) static GstStaticPadTemplate gst_input_selector_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate gst_input_selector_src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); enum { PROP_0, PROP_N_PADS, PROP_ACTIVE_PAD }; #define DEFAULT_PAD_ALWAYS_OK TRUE enum { PROP_PAD_0, PROP_PAD_RUNNING_TIME, PROP_PAD_TAGS, PROP_PAD_ACTIVE, PROP_PAD_ALWAYS_OK }; enum { /* methods */ SIGNAL_BLOCK, SIGNAL_SWITCH, LAST_SIGNAL }; static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 }; static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad); static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad); static GstPad *gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad, gboolean strict); #define GST_TYPE_SELECTOR_PAD \ (gst_selector_pad_get_type()) #define GST_SELECTOR_PAD(obj) \ (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad)) #define GST_SELECTOR_PAD_CLASS(klass) \ (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass)) #define GST_IS_SELECTOR_PAD(obj) \ (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD)) #define GST_IS_SELECTOR_PAD_CLASS(klass) \ (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD)) #define GST_SELECTOR_PAD_CAST(obj) \ ((GstSelectorPad *)(obj)) typedef struct _GstSelectorPad GstSelectorPad; typedef struct _GstSelectorPadClass GstSelectorPadClass; struct _GstSelectorPad { GstPad parent; gboolean active; /* when buffer have passed the pad */ gboolean pushed; /* when buffer was pushed downstream since activation */ gboolean eos; /* when EOS has been received */ gboolean eos_sent; /* when EOS was sent downstream */ gboolean discont; /* after switching we create a discont */ gboolean flushing; /* set after flush-start and before flush-stop */ gboolean always_ok; GstSegment segment; /* the current segment on the pad */ GstTagList *tags; /* last tags received on the pad */ gboolean segment_pending; }; struct _GstSelectorPadClass { GstPadClass parent; }; GType gst_selector_pad_get_type (void); static void gst_selector_pad_finalize (GObject * object); static void gst_selector_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_selector_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad); static void gst_selector_pad_reset (GstSelectorPad * pad); static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event); static GstCaps *gst_selector_pad_getcaps (GstPad * pad, GstCaps * filter); static gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps); static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad); static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf); G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD); static void gst_selector_pad_class_init (GstSelectorPadClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; gobject_class->finalize = gst_selector_pad_finalize; gobject_class->get_property = gst_selector_pad_get_property; gobject_class->set_property = gst_selector_pad_set_property; g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME, g_param_spec_int64 ("running-time", "Running time", "Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_TAGS, g_param_spec_boxed ("tags", "Tags", "The currently active tags on the pad", GST_TYPE_TAG_LIST, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE, g_param_spec_boolean ("active", "Active", "If the pad is currently active", FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /* FIXME: better property name? */ g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK, g_param_spec_boolean ("always-ok", "Always OK", "Make an inactive pad return OK instead of NOT_LINKED", DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_selector_pad_init (GstSelectorPad * pad) { pad->always_ok = DEFAULT_PAD_ALWAYS_OK; gst_selector_pad_reset (pad); } static void gst_selector_pad_finalize (GObject * object) { GstSelectorPad *pad; pad = GST_SELECTOR_PAD_CAST (object); if (pad->tags) gst_tag_list_free (pad->tags); G_OBJECT_CLASS (gst_selector_pad_parent_class)->finalize (object); } static void gst_selector_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object); switch (prop_id) { case PROP_PAD_ALWAYS_OK: GST_OBJECT_LOCK (object); spad->always_ok = g_value_get_boolean (value); GST_OBJECT_UNLOCK (object); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_selector_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object); switch (prop_id) { case PROP_PAD_RUNNING_TIME: g_value_set_int64 (value, gst_selector_pad_get_running_time (spad)); break; case PROP_PAD_TAGS: GST_OBJECT_LOCK (object); g_value_set_boxed (value, spad->tags); GST_OBJECT_UNLOCK (object); break; case PROP_PAD_ACTIVE: { GstInputSelector *sel; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad)); g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel, GST_PAD_CAST (spad))); gst_object_unref (sel); break; } case PROP_PAD_ALWAYS_OK: GST_OBJECT_LOCK (object); g_value_set_boolean (value, spad->always_ok); GST_OBJECT_UNLOCK (object); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad) { gint64 ret = 0; GST_OBJECT_LOCK (pad); if (pad->active) { gint64 position = pad->segment.position; if (position >= 0) ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME, position); } GST_OBJECT_UNLOCK (pad); GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT, GST_TIME_ARGS (ret)); return ret; } static void gst_selector_pad_reset (GstSelectorPad * pad) { GST_OBJECT_LOCK (pad); pad->active = FALSE; pad->pushed = FALSE; pad->eos = FALSE; pad->eos_sent = FALSE; pad->segment_pending = FALSE; pad->discont = FALSE; pad->flushing = FALSE; gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED); GST_OBJECT_UNLOCK (pad); } /* strictly get the linked pad from the sinkpad. If the pad is active we return * the srcpad else we return NULL */ static GstIterator * gst_selector_pad_iterate_linked_pads (GstPad * pad) { GstInputSelector *sel; GstPad *otherpad; GstIterator *it; GValue val = { 0, }; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return NULL; otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE); g_value_init (&val, GST_TYPE_PAD); g_value_set_object (&val, otherpad); it = gst_iterator_new_single (GST_TYPE_PAD, &val); g_value_unset (&val); if (otherpad) gst_object_unref (otherpad); gst_object_unref (sel); return it; } static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event) { gboolean res = TRUE; gboolean forward; GstInputSelector *sel; GstSelectorPad *selpad; GstPad *prev_active_sinkpad; GstPad *active_sinkpad; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) { gst_event_unref (event); return FALSE; } selpad = GST_SELECTOR_PAD_CAST (pad); GST_INPUT_SELECTOR_LOCK (sel); prev_active_sinkpad = sel->active_sinkpad; active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* only forward if we are dealing with the active sinkpad */ forward = (pad == active_sinkpad); GST_INPUT_SELECTOR_UNLOCK (sel); if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (sel), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: /* Unblock the pad if it's waiting */ GST_INPUT_SELECTOR_LOCK (sel); selpad->flushing = TRUE; GST_INPUT_SELECTOR_BROADCAST (sel); GST_INPUT_SELECTOR_UNLOCK (sel); break; case GST_EVENT_FLUSH_STOP: GST_INPUT_SELECTOR_LOCK (sel); gst_selector_pad_reset (selpad); sel->pending_close = FALSE; GST_INPUT_SELECTOR_UNLOCK (sel); break; case GST_EVENT_SEGMENT: { GST_INPUT_SELECTOR_LOCK (sel); GST_OBJECT_LOCK (selpad); gst_event_parse_segment (event, &selpad->segment); GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT, &selpad->segment); GST_OBJECT_UNLOCK (selpad); /* If we aren't forwarding the event because the pad is not the * active_sinkpad, then set the flag on the pad * that says a segment needs sending if/when that pad is activated. * For all other cases, we send the event immediately, which makes * sparse streams and other segment updates work correctly downstream. */ if (!forward) selpad->segment_pending = TRUE; GST_INPUT_SELECTOR_UNLOCK (sel); break; } case GST_EVENT_TAG: { GstTagList *tags, *oldtags, *newtags; gst_event_parse_tag (event, &tags); GST_OBJECT_LOCK (selpad); oldtags = selpad->tags; newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE); selpad->tags = newtags; if (oldtags) gst_tag_list_free (oldtags); GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags); GST_OBJECT_UNLOCK (selpad); g_object_notify (G_OBJECT (selpad), "tags"); break; } case GST_EVENT_EOS: selpad->eos = TRUE; if (forward) { selpad->eos_sent = TRUE; } else { GstSelectorPad *tmp; /* If the active sinkpad is in EOS state but EOS * was not sent downstream this means that the pad * got EOS before it was set as active pad and that * the previously active pad got EOS after it was * active */ GST_INPUT_SELECTOR_LOCK (sel); active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); tmp = GST_SELECTOR_PAD (active_sinkpad); forward = (tmp->eos && !tmp->eos_sent); tmp->eos_sent = TRUE; GST_INPUT_SELECTOR_UNLOCK (sel); } GST_DEBUG_OBJECT (pad, "received EOS"); break; default: break; } if (forward) { GST_DEBUG_OBJECT (pad, "forwarding event"); res = gst_pad_push_event (sel->srcpad, event); } else gst_event_unref (event); gst_object_unref (sel); return res; } static GstCaps * gst_selector_pad_getcaps (GstPad * pad, GstCaps * filter) { GstInputSelector *sel; GstCaps *caps; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return (filter ? gst_caps_ref (filter) : gst_caps_new_any ()); GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer"); caps = gst_pad_peer_get_caps (sel->srcpad, filter); if (caps == NULL) caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ()); gst_object_unref (sel); return caps; } static gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps) { GstInputSelector *sel; gboolean res; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return FALSE; GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer"); res = gst_pad_peer_accept_caps (sel->srcpad, caps); gst_object_unref (sel); return res; } /* must be called with the SELECTOR_LOCK, will block while the pad is blocked * or return TRUE when flushing */ static gboolean gst_input_selector_wait (GstInputSelector * self, GstSelectorPad * pad) { while (self->blocked && !self->flushing && !pad->flushing) { /* we can be unlocked here when we are shutting down (flushing) or when we * get unblocked */ GST_INPUT_SELECTOR_WAIT (self); } return self->flushing; } static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf) { GstInputSelector *sel; GstFlowReturn res; GstPad *active_sinkpad; GstPad *prev_active_sinkpad; GstSelectorPad *selpad; GstClockTime start_time; GstSegment *seg; GstEvent *start_event = NULL; #if 0 GstCaps *caps; #endif sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); selpad = GST_SELECTOR_PAD_CAST (pad); seg = &selpad->segment; GST_INPUT_SELECTOR_LOCK (sel); /* wait or check for flushing */ if (gst_input_selector_wait (sel, selpad)) goto flushing; GST_LOG_OBJECT (pad, "getting active pad"); prev_active_sinkpad = sel->active_sinkpad; active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* update the segment on the srcpad */ start_time = GST_BUFFER_TIMESTAMP (buf); if (GST_CLOCK_TIME_IS_VALID (start_time)) { GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT, GST_TIME_ARGS (start_time)); if (GST_BUFFER_DURATION_IS_VALID (buf)) GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT, GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf))); GST_OBJECT_LOCK (pad); seg->position = start_time; GST_OBJECT_UNLOCK (pad); } /* Ignore buffers from pads except the selected one */ if (pad != active_sinkpad) goto ignore; /* if we have a pending segment, push it out now */ if (G_UNLIKELY (selpad->segment_pending)) { GST_DEBUG_OBJECT (pad, "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, " "format %d, " "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %" G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop, seg->time); start_event = gst_event_new_segment (seg); selpad->segment_pending = FALSE; } GST_INPUT_SELECTOR_UNLOCK (sel); if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (sel), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } if (start_event) gst_pad_push_event (sel->srcpad, start_event); if (selpad->discont) { buf = gst_buffer_make_writable (buf); GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf); GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT); selpad->discont = FALSE; } /* forward */ GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf); #if 0 if ((caps = GST_BUFFER_CAPS (buf))) { if (GST_PAD_CAPS (sel->srcpad) != caps) gst_pad_set_caps (sel->srcpad, caps); } #endif res = gst_pad_push (sel->srcpad, buf); selpad->pushed = TRUE; done: gst_object_unref (sel); return res; /* dropped buffers */ ignore: { gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed; GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf); /* when we drop a buffer, we're creating a discont on this pad */ selpad->discont = TRUE; GST_INPUT_SELECTOR_UNLOCK (sel); gst_buffer_unref (buf); /* figure out what to return upstream */ GST_OBJECT_LOCK (selpad); if (selpad->always_ok || !active_pad_pushed) res = GST_FLOW_OK; else res = GST_FLOW_NOT_LINKED; GST_OBJECT_UNLOCK (selpad); goto done; } flushing: { GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf); GST_INPUT_SELECTOR_UNLOCK (sel); gst_buffer_unref (buf); res = GST_FLOW_WRONG_STATE; goto done; } } static void gst_input_selector_dispose (GObject * object); static void gst_input_selector_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_input_selector_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstPad *gst_input_selector_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * unused, const GstCaps * caps); static void gst_input_selector_release_pad (GstElement * element, GstPad * pad); static GstStateChangeReturn gst_input_selector_change_state (GstElement * element, GstStateChange transition); static GstCaps *gst_input_selector_getcaps (GstPad * pad, GstCaps * filter); static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event); static gboolean gst_input_selector_query (GstPad * pad, GstQuery ** query); static gint64 gst_input_selector_block (GstInputSelector * self); static void gst_input_selector_switch (GstInputSelector * self, GstPad * pad, gint64 stop_time, gint64 start_time); /* FIXME: create these marshallers using glib-genmarshal */ #define g_marshal_value_peek_object(v) (v)->data[0].v_pointer #define g_marshal_value_peek_int64(v) (v)->data[0].v_int64 static void gst_input_selector_marshal_INT64__VOID (GClosure * closure, GValue * return_value G_GNUC_UNUSED, guint n_param_values, const GValue * param_values, gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data) { typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2); register GMarshalFunc_INT64__VOID callback; register GCClosure *cc = (GCClosure *) closure; register gpointer data1, data2; gint64 v_return; g_return_if_fail (return_value != NULL); g_return_if_fail (n_param_values == 1); if (G_CCLOSURE_SWAP_DATA (closure)) { data1 = closure->data; data2 = g_value_peek_pointer (param_values + 0); } else { data1 = g_value_peek_pointer (param_values + 0); data2 = closure->data; } callback = (GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback); v_return = callback (data1, data2); g_value_set_int64 (return_value, v_return); } static void gst_input_selector_marshal_VOID__OBJECT_INT64_INT64 (GClosure * closure, GValue * return_value G_GNUC_UNUSED, guint n_param_values, const GValue * param_values, gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data) { typedef void (*GMarshalFunc_VOID__OBJECT_INT64_INT64) (gpointer data1, gpointer arg_1, gint64 arg_2, gint64 arg_3, gpointer data2); register GMarshalFunc_VOID__OBJECT_INT64_INT64 callback; register GCClosure *cc = (GCClosure *) closure; register gpointer data1, data2; g_return_if_fail (n_param_values == 4); if (G_CCLOSURE_SWAP_DATA (closure)) { data1 = closure->data; data2 = g_value_peek_pointer (param_values + 0); } else { data1 = g_value_peek_pointer (param_values + 0); data2 = closure->data; } callback = (GMarshalFunc_VOID__OBJECT_INT64_INT64) (marshal_data ? marshal_data : cc->callback); callback (data1, g_marshal_value_peek_object (param_values + 1), g_marshal_value_peek_int64 (param_values + 2), g_marshal_value_peek_int64 (param_values + 3), data2); } #define _do_init \ GST_DEBUG_CATEGORY_INIT (input_selector_debug, \ "input-selector", 0, "An input stream selector element"); #define gst_input_selector_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT, _do_init); static void gst_input_selector_class_init (GstInputSelectorClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); gobject_class->dispose = gst_input_selector_dispose; gobject_class->set_property = gst_input_selector_set_property; gobject_class->get_property = gst_input_selector_get_property; g_object_class_install_property (gobject_class, PROP_N_PADS, g_param_spec_uint ("n-pads", "Number of Pads", "The number of sink pads", 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD, g_param_spec_object ("active-pad", "Active pad", "The currently active sink pad", GST_TYPE_PAD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstInputSelector::block: * @inputselector: the #GstInputSelector * * Block all sink pads in preparation for a switch. Returns the stop time of * the current switch segment, as a running time, or 0 if there is no current * active pad or the current active pad never received data. */ gst_input_selector_signals[SIGNAL_BLOCK] = g_signal_new ("block", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL, gst_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0); /** * GstInputSelector::switch: * @inputselector: the #GstInputSelector * @pad: the pad to switch to * @stop_time: running time at which to close the previous segment, or -1 * to use the running time of the previously active sink pad * @start_time: running time at which to start the new segment, or -1 to * use the running time of the newly active sink pad * * Switch to a new feed. The segment opened by the previously active pad, if * any, will be closed, and a new segment opened before data flows again. * * This signal must be emitted when the element has been blocked via the block signal. * * If you have a stream with only one switch element, such as an audio-only * stream, a stream switch should be performed by first emitting the block * signal, and then emitting the switch signal with -1 for the stop and start * time values. * * The intention of the @stop_time and @start_time arguments is to allow * multiple switch elements to switch and maintain stream synchronization. * When switching a stream with multiple feeds, you will need as many switch * elements as you have feeds. For example, a feed with audio and video will * have one switch element between the audio feeds and one for video. * * A switch over multiple switch elements should be performed as follows: * First, emit the block * signal, collecting the returned values. The maximum running time returned * by block should then be used as the time at which to close the previous * segment. * * Then, query the running times of the new audio and video pads that you will * switch to. Naturally, these pads are on separate switch elements. Take the * minimum running time for those streams and use it for the time at which to * open the new segment. * * If @pad is the same as the current active pad, the element will cancel any * previous block without adjusting segments. * * * the signal changed from accepting the pad name to the pad object. * * * Since: 0.10.7 */ gst_input_selector_signals[SIGNAL_SWITCH] = g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstInputSelectorClass, switch_), NULL, NULL, gst_input_selector_marshal_VOID__OBJECT_INT64_INT64, G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64); gst_element_class_set_details_simple (gstelement_class, "Input selector", "Generic", "N-to-1 input stream selector", "Julien Moutte , " "Jan Schmidt , " "Wim Taymans "); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_input_selector_sink_factory)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_input_selector_src_factory)); gstelement_class->request_new_pad = gst_input_selector_request_new_pad; gstelement_class->release_pad = gst_input_selector_release_pad; gstelement_class->change_state = gst_input_selector_change_state; klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block); /* note the underscore because switch is a keyword otherwise */ klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch); } static void gst_input_selector_init (GstInputSelector * sel) { sel->srcpad = gst_pad_new ("src", GST_PAD_SRC); gst_pad_set_iterate_internal_links_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads)); gst_pad_set_getcaps_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_input_selector_getcaps)); gst_pad_set_query_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_input_selector_query)); gst_pad_set_event_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_input_selector_event)); gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad); /* sinkpad management */ sel->active_sinkpad = NULL; sel->padcount = 0; gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED); sel->lock = g_mutex_new (); sel->cond = g_cond_new (); sel->blocked = FALSE; } static void gst_input_selector_dispose (GObject * object) { GstInputSelector *sel = GST_INPUT_SELECTOR (object); if (sel->active_sinkpad) { gst_object_unref (sel->active_sinkpad); sel->active_sinkpad = NULL; } if (sel->lock) { g_mutex_free (sel->lock); sel->lock = NULL; } if (sel->cond) { g_cond_free (sel->cond); sel->cond = NULL; } G_OBJECT_CLASS (parent_class)->dispose (object); } /* Solve the following equation for B.timestamp, and set that as the segment * stop: * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum */ static gint64 gst_segment_get_timestamp (GstSegment * segment, gint64 running_time) { if (running_time <= segment->base) return segment->start; else return (running_time - segment->base) * ABS (segment->rate) + segment->start; } static void gst_segment_set_stop (GstSegment * segment, gint64 running_time) { segment->stop = gst_segment_get_timestamp (segment, running_time); segment->position = -1; } static void gst_segment_set_start (GstSegment * segment, gint64 running_time) { gint64 new_start, duration; new_start = gst_segment_get_timestamp (segment, running_time); /* this is the duration we skipped */ duration = new_start - segment->start; /* add the duration to the accumulated segment time */ segment->base += duration; /* move position in the segment */ segment->time += duration; segment->start += duration; } /* this function must be called with the SELECTOR_LOCK. It returns TRUE when the * active pad changed. */ static gboolean gst_input_selector_set_active_pad (GstInputSelector * self, GstPad * pad, gint64 stop_time, gint64 start_time) { GstSelectorPad *old, *new; GstPad **active_pad_p; if (pad == self->active_sinkpad) return FALSE; old = GST_SELECTOR_PAD_CAST (self->active_sinkpad); new = GST_SELECTOR_PAD_CAST (pad); GST_DEBUG_OBJECT (self, "setting active pad to %s:%s", GST_DEBUG_PAD_NAME (new)); if (!GST_CLOCK_TIME_IS_VALID (stop_time) && old) { /* no stop time given, get the latest running_time on the active pad to * close and open the new segment */ stop_time = start_time = gst_selector_pad_get_running_time (old); GST_DEBUG_OBJECT (self, "using start/stop of %" GST_TIME_FORMAT, GST_TIME_ARGS (start_time)); } if (old && old->active && !self->pending_close && stop_time >= 0) { /* schedule a last_stop update if one isn't already scheduled, and a segment has been pushed before. */ memcpy (&self->segment, &old->segment, sizeof (self->segment)); GST_DEBUG_OBJECT (self, "setting stop_time to %" GST_TIME_FORMAT, GST_TIME_ARGS (stop_time)); gst_segment_set_stop (&self->segment, stop_time); self->pending_close = TRUE; } if (old) old->pushed = FALSE; if (new && new->active && start_time >= 0) { GST_DEBUG_OBJECT (self, "setting start_time to %" GST_TIME_FORMAT, GST_TIME_ARGS (start_time)); /* schedule a new segment push */ gst_segment_set_start (&new->segment, start_time); new->segment_pending = TRUE; } if (new) new->pushed = FALSE; active_pad_p = &self->active_sinkpad; gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad)); GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT, self->active_sinkpad); return TRUE; } static void gst_input_selector_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstInputSelector *sel = GST_INPUT_SELECTOR (object); switch (prop_id) { case PROP_ACTIVE_PAD: { GstPad *pad; pad = g_value_get_object (value); GST_INPUT_SELECTOR_LOCK (sel); gst_input_selector_set_active_pad (sel, pad, GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE); GST_INPUT_SELECTOR_UNLOCK (sel); break; } default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_input_selector_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstInputSelector *sel = GST_INPUT_SELECTOR (object); switch (prop_id) { case PROP_N_PADS: GST_INPUT_SELECTOR_LOCK (object); g_value_set_uint (value, sel->n_pads); GST_INPUT_SELECTOR_UNLOCK (object); break; case PROP_ACTIVE_PAD: GST_INPUT_SELECTOR_LOCK (object); g_value_set_object (value, sel->active_sinkpad); GST_INPUT_SELECTOR_UNLOCK (object); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstPad * gst_input_selector_get_linked_pad (GstInputSelector * sel, GstPad * pad, gboolean strict) { GstPad *otherpad = NULL; GST_INPUT_SELECTOR_LOCK (sel); if (pad == sel->srcpad) otherpad = sel->active_sinkpad; else if (pad == sel->active_sinkpad || !strict) otherpad = sel->srcpad; if (otherpad) gst_object_ref (otherpad); GST_INPUT_SELECTOR_UNLOCK (sel); return otherpad; } static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event) { GstInputSelector *sel; gboolean res = FALSE; GstPad *otherpad; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) { gst_event_unref (event); return FALSE; } otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE); if (otherpad) { res = gst_pad_push_event (otherpad, event); gst_object_unref (otherpad); } else gst_event_unref (event); gst_object_unref (sel); return res; } /* query on the srcpad. We override this function because by default it will * only forward the query to one random sinkpad */ static gboolean gst_input_selector_query (GstPad * pad, GstQuery ** query) { gboolean res = TRUE; GstInputSelector *sel; GstPad *otherpad; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return FALSE; otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE); switch (GST_QUERY_TYPE (*query)) { case GST_QUERY_LATENCY: { GList *walk; GstClockTime resmin, resmax; gboolean reslive; resmin = 0; resmax = -1; reslive = FALSE; /* assume FALSE, we become TRUE if one query succeeds */ res = FALSE; /* perform the query on all sinkpads and combine the results. We take the * max of min and the min of max for the result latency. */ GST_INPUT_SELECTOR_LOCK (sel); for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) { GstPad *sinkpad = GST_PAD_CAST (walk->data); if (gst_pad_peer_query (sinkpad, query)) { GstClockTime min, max; gboolean live; /* one query succeeded, we succeed too */ res = TRUE; gst_query_parse_latency (*query, &live, &min, &max); GST_DEBUG_OBJECT (sinkpad, "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live); if (live) { if (min > resmin) resmin = min; if (resmax == -1) resmax = max; else if (max < resmax) resmax = max; if (reslive == FALSE) reslive = live; } } } GST_INPUT_SELECTOR_UNLOCK (sel); if (res) { gst_query_set_latency (*query, reslive, resmin, resmax); GST_DEBUG_OBJECT (sel, "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax), reslive); } break; } default: if (otherpad) res = gst_pad_peer_query (otherpad, query); break; } if (otherpad) gst_object_unref (otherpad); gst_object_unref (sel); return res; } static GstCaps * gst_input_selector_getcaps (GstPad * pad, GstCaps * filter) { GstPad *otherpad; GstInputSelector *sel; GstCaps *caps; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return (filter ? gst_caps_ref (filter) : gst_caps_new_any ()); otherpad = gst_input_selector_get_linked_pad (sel, pad, FALSE); if (!otherpad) { GST_DEBUG_OBJECT (pad, "Pad not linked, returning ANY"); caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ()); } else { GST_DEBUG_OBJECT (pad, "Pad is linked (to %s:%s), returning peer caps", GST_DEBUG_PAD_NAME (otherpad)); /* if the peer has caps, use those. If the pad is not linked, this function * returns NULL and we return ANY */ if (!(caps = gst_pad_peer_get_caps (otherpad, filter))) caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ()); gst_object_unref (otherpad); } gst_object_unref (sel); return caps; } /* check if the pad is the active sinkpad */ static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad) { gboolean res; GST_INPUT_SELECTOR_LOCK (sel); res = (pad == sel->active_sinkpad); GST_INPUT_SELECTOR_UNLOCK (sel); return res; } /* Get or create the active sinkpad, must be called with SELECTOR_LOCK */ static GstPad * gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad) { GstPad *active_sinkpad; GstSelectorPad *selpad; selpad = GST_SELECTOR_PAD_CAST (pad); selpad->active = TRUE; active_sinkpad = sel->active_sinkpad; if (active_sinkpad == NULL) { /* first pad we get activity on becomes the activated pad by default */ if (sel->active_sinkpad) gst_object_unref (sel->active_sinkpad); active_sinkpad = sel->active_sinkpad = gst_object_ref (pad); GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad)); } return active_sinkpad; } static GstPad * gst_input_selector_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * unused, const GstCaps * caps) { GstInputSelector *sel; gchar *name = NULL; GstPad *sinkpad = NULL; g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL); sel = GST_INPUT_SELECTOR (element); GST_INPUT_SELECTOR_LOCK (sel); GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount); name = g_strdup_printf ("sink%d", sel->padcount++); sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD, "name", name, "direction", templ->direction, "template", templ, NULL); g_free (name); sel->n_pads++; gst_pad_set_event_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_event)); gst_pad_set_getcaps_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps)); gst_pad_set_acceptcaps_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps)); gst_pad_set_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_chain)); gst_pad_set_iterate_internal_links_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads)); gst_pad_set_active (sinkpad, TRUE); gst_element_add_pad (GST_ELEMENT (sel), sinkpad); GST_INPUT_SELECTOR_UNLOCK (sel); return sinkpad; } static void gst_input_selector_release_pad (GstElement * element, GstPad * pad) { GstInputSelector *sel; sel = GST_INPUT_SELECTOR (element); GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad)); GST_INPUT_SELECTOR_LOCK (sel); /* if the pad was the active pad, makes us select a new one */ if (sel->active_sinkpad == pad) { GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad)); gst_object_unref (sel->active_sinkpad); sel->active_sinkpad = NULL; } sel->n_pads--; gst_pad_set_active (pad, FALSE); gst_element_remove_pad (GST_ELEMENT (sel), pad); GST_INPUT_SELECTOR_UNLOCK (sel); } static void gst_input_selector_reset (GstInputSelector * sel) { GList *walk; GST_INPUT_SELECTOR_LOCK (sel); /* clear active pad */ if (sel->active_sinkpad) { gst_object_unref (sel->active_sinkpad); sel->active_sinkpad = NULL; } /* reset segment */ gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED); sel->pending_close = FALSE; /* reset each of our sinkpads state */ for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) { GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data); gst_selector_pad_reset (selpad); if (selpad->tags) { gst_tag_list_free (selpad->tags); selpad->tags = NULL; } } GST_INPUT_SELECTOR_UNLOCK (sel); } static GstStateChangeReturn gst_input_selector_change_state (GstElement * element, GstStateChange transition) { GstInputSelector *self = GST_INPUT_SELECTOR (element); GstStateChangeReturn result; switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: GST_INPUT_SELECTOR_LOCK (self); self->blocked = FALSE; self->flushing = FALSE; GST_INPUT_SELECTOR_UNLOCK (self); break; case GST_STATE_CHANGE_PAUSED_TO_READY: /* first unlock before we call the parent state change function, which * tries to acquire the stream lock when going to ready. */ GST_INPUT_SELECTOR_LOCK (self); self->blocked = FALSE; self->flushing = TRUE; GST_INPUT_SELECTOR_BROADCAST (self); GST_INPUT_SELECTOR_UNLOCK (self); break; default: break; } result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_input_selector_reset (self); break; default: break; } return result; } static gint64 gst_input_selector_block (GstInputSelector * self) { gint64 ret = 0; GstSelectorPad *spad; GST_INPUT_SELECTOR_LOCK (self); if (self->blocked) GST_WARNING_OBJECT (self, "switch already blocked"); self->blocked = TRUE; spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad); if (spad) ret = gst_selector_pad_get_running_time (spad); else GST_DEBUG_OBJECT (self, "no active pad while blocking"); GST_INPUT_SELECTOR_UNLOCK (self); return ret; } /* stop_time and start_time are running times */ static void gst_input_selector_switch (GstInputSelector * self, GstPad * pad, gint64 stop_time, gint64 start_time) { gboolean changed; g_return_if_fail (self->blocked == TRUE); GST_INPUT_SELECTOR_LOCK (self); changed = gst_input_selector_set_active_pad (self, pad, stop_time, start_time); self->blocked = FALSE; GST_INPUT_SELECTOR_BROADCAST (self); GST_INPUT_SELECTOR_UNLOCK (self); if (changed) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (self), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } }