/* GStreamer * 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 ) * * 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 * @short_description: N-to-1 stream selectoring * @see_also: #GstOutputSelector * * Direct one out of N input streams to the output pad. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstinputselector.h" #include "gstselector-marshal.h" GST_DEBUG_CATEGORY_STATIC (input_selector_debug); #define GST_CAT_DEFAULT input_selector_debug static const GstElementDetails gst_input_selector_details = GST_ELEMENT_DETAILS ("Input selector", "Generic", "N-to-1 input stream selectoring", "Julien Moutte \n" "Ronald S. Bultje \n" "Jan Schmidt \n" "Wim Taymans "); 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, PROP_SELECT_ALL, PROP_LAST }; enum { PROP_PAD_0, PROP_PAD_RUNNING_TIME, PROP_PAD_TAGS, PROP_PAD_ACTIVE, PROP_PAD_LAST }; enum { /* methods */ SIGNAL_BLOCK, SIGNAL_SWITCH, LAST_SIGNAL }; static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 }; static 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 (GstPad * pad, gboolean strict); static gboolean gst_input_selector_check_eos (GstElement * selector); #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 eos; /* when EOS has been received */ gboolean discont; /* after switching we create a discont */ GstSegment segment; /* the current segment on the pad */ GstTagList *tags; /* last tags received on the pad */ gboolean segment_pending; }; struct _GstSelectorPadClass { GstPadClass parent; }; static void gst_selector_pad_class_init (GstSelectorPadClass * klass); static void gst_selector_pad_init (GstSelectorPad * pad); 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 GstPadClass *selector_pad_parent_class = NULL; 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); static GList *gst_selector_pad_get_linked_pads (GstPad * pad); static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf); static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf); static GType gst_selector_pad_get_type (void) { static GType selector_pad_type = 0; if (!selector_pad_type) { static const GTypeInfo selector_pad_info = { sizeof (GstSelectorPadClass), NULL, NULL, (GClassInitFunc) gst_selector_pad_class_init, NULL, NULL, sizeof (GstSelectorPad), 0, (GInstanceInitFunc) gst_selector_pad_init, }; selector_pad_type = g_type_register_static (GST_TYPE_PAD, "GstSelectorPad", &selector_pad_info, 0); } return selector_pad_type; } static void gst_selector_pad_class_init (GstSelectorPadClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; selector_pad_parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = gst_selector_pad_finalize; gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_selector_pad_get_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_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_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)); } static void gst_selector_pad_init (GstSelectorPad * pad) { 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 (selector_pad_parent_class)->finalize (object); } 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; } 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 last_stop = pad->segment.last_stop; if (last_stop >= 0) ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME, last_stop); } 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->eos = FALSE; pad->segment_pending = 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 GList * gst_selector_pad_get_linked_pads (GstPad * pad) { GstPad *otherpad; otherpad = gst_input_selector_get_linked_pad (pad, TRUE); if (!otherpad) return NULL; /* need to drop the ref, internal linked pads is not MT safe */ gst_object_unref (otherpad); return g_list_append (NULL, otherpad); } static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event) { gboolean res = TRUE; gboolean forward = TRUE; GstInputSelector *sel; GstSelectorPad *selpad; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); selpad = GST_SELECTOR_PAD_CAST (pad); /* only forward if we are dealing with the active sinkpad */ forward = gst_input_selector_is_active_sinkpad (sel, pad); /* forward all events in select_all mode by default */ if (sel->select_all) { forward = TRUE; } switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: /* FIXME, flush out the waiter */ 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_NEWSEGMENT: { gboolean update; GstFormat format; gdouble rate, arate; gint64 start, stop, time; gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format, &start, &stop, &time); GST_DEBUG_OBJECT (pad, "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, " "format %d, " "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %" G_GINT64_FORMAT, update, rate, arate, format, start, stop, time); GST_INPUT_SELECTOR_LOCK (sel); GST_OBJECT_LOCK (selpad); gst_segment_set_newsegment_full (&selpad->segment, update, rate, arate, format, start, stop, time); GST_OBJECT_UNLOCK (selpad); /* we are not going to forward the segment, mark the segment as * pending */ forward = FALSE; selpad->segment_pending = TRUE; GST_INPUT_SELECTOR_UNLOCK (sel); break; } case GST_EVENT_TAG: { GstTagList *tags; GST_OBJECT_LOCK (selpad); if (selpad->tags) gst_tag_list_free (selpad->tags); gst_event_parse_tag (event, &tags); if (tags) tags = gst_tag_list_copy (tags); selpad->tags = tags; GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, selpad->tags); GST_OBJECT_UNLOCK (selpad); break; } case GST_EVENT_EOS: selpad->eos = TRUE; GST_DEBUG_OBJECT (pad, "received EOS"); /* don't forward eos in select_all mode until all sink pads have eos */ if (sel->select_all && !gst_input_selector_check_eos (GST_ELEMENT (sel))) { forward = FALSE; } 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) { GstInputSelector *sel; GstCaps *caps; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer"); caps = gst_pad_peer_get_caps (sel->srcpad); if (caps == NULL) caps = gst_caps_new_any (); gst_object_unref (sel); return caps; } static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf) { GstInputSelector *sel; GstFlowReturn result; GstPad *active_sinkpad; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); GST_DEBUG_OBJECT (pad, "received alloc"); GST_INPUT_SELECTOR_LOCK (sel); active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); GST_INPUT_SELECTOR_UNLOCK (sel); /* Fallback allocation for buffers from pads except the selected one */ if (pad != active_sinkpad && !sel->select_all) { GST_DEBUG_OBJECT (sel, "Pad %s:%s is not selected. Performing fallback allocation", GST_DEBUG_PAD_NAME (pad)); *buf = NULL; result = GST_FLOW_OK; } else { result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf); /* FIXME: HACK. If buffer alloc returns not-linked, perform a fallback * allocation. This should NOT be necessary, because playbin should * properly block the source pad from running until it's finished hooking * everything up, but playbin needs refactoring first. */ if (result == GST_FLOW_NOT_LINKED) { GST_DEBUG_OBJECT (sel, "No peer pad yet - performing fallback allocation for pad %s:%s", GST_DEBUG_PAD_NAME (pad)); *buf = NULL; result = GST_FLOW_OK; } } gst_object_unref (sel); return result; } /* 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, GstPad * pad) { while (self->blocked && !self->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; GstSelectorPad *selpad; GstClockTime end_time, duration; GstSegment *seg; GstEvent *close_event = NULL, *start_event = NULL; 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, pad)) goto flushing; GST_DEBUG_OBJECT (pad, "getting active pad"); active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* update the segment on the srcpad */ end_time = GST_BUFFER_TIMESTAMP (buf); if (GST_CLOCK_TIME_IS_VALID (end_time)) { duration = GST_BUFFER_DURATION (buf); if (GST_CLOCK_TIME_IS_VALID (duration)) end_time += duration; GST_DEBUG_OBJECT (pad, "received end time %" GST_TIME_FORMAT, GST_TIME_ARGS (end_time)); GST_OBJECT_LOCK (pad); gst_segment_set_last_stop (seg, seg->format, end_time); GST_OBJECT_UNLOCK (pad); } /* Ignore buffers from pads except the selected one */ if (pad != active_sinkpad && !sel->select_all) goto ignore; if (G_UNLIKELY (sel->pending_close)) { GstSegment *cseg = &sel->segment; GST_DEBUG_OBJECT (sel, "pushing NEWSEGMENT update %d, rate %lf, applied rate %lf, " "format %d, " "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %" G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time); /* create update segment */ close_event = gst_event_new_new_segment_full (TRUE, cseg->rate, cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time); sel->pending_close = FALSE; } /* if we have a pending segment, push it out now */ if (G_UNLIKELY (selpad->segment_pending)) { GST_DEBUG_OBJECT (pad, "pushing 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_new_segment_full (FALSE, seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop, seg->time); selpad->segment_pending = FALSE; } GST_INPUT_SELECTOR_UNLOCK (sel); if (close_event) gst_pad_push_event (sel->srcpad, close_event); if (start_event) gst_pad_push_event (sel->srcpad, start_event); if (selpad->discont) { buf = gst_buffer_make_metadata_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_DEBUG_OBJECT (pad, "Forwarding buffer %p from pad %s:%s", buf, GST_DEBUG_PAD_NAME (pad)); res = gst_pad_push (sel->srcpad, buf); done: gst_object_unref (sel); return res; /* dropped buffers */ ignore: { 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); res = GST_FLOW_NOT_LINKED; 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_init (GstInputSelector * sel); static void gst_input_selector_base_init (GstInputSelectorClass * klass); static void gst_input_selector_class_init (GstInputSelectorClass * klass); 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); static void gst_input_selector_release_pad (GstElement * element, GstPad * pad); static GstStateChangeReturn gst_input_selector_change_state (GstElement * element, GstStateChange transition); static GList *gst_input_selector_get_linked_pads (GstPad * pad); static GstCaps *gst_input_selector_getcaps (GstPad * pad); static gint64 gst_input_selector_block (GstInputSelector * self); static void gst_input_selector_switch (GstInputSelector * self, GstPad * pad, gint64 stop_time, gint64 start_time); static GstElementClass *parent_class = NULL; GType gst_input_selector_get_type (void) { static GType input_selector_type = 0; if (!input_selector_type) { static const GTypeInfo input_selector_info = { sizeof (GstInputSelectorClass), (GBaseInitFunc) gst_input_selector_base_init, NULL, (GClassInitFunc) gst_input_selector_class_init, NULL, NULL, sizeof (GstInputSelector), 0, (GInstanceInitFunc) gst_input_selector_init, }; input_selector_type = g_type_register_static (GST_TYPE_ELEMENT, "GstInputSelector", &input_selector_info, 0); GST_DEBUG_CATEGORY_INIT (input_selector_debug, "input-selector", 0, "An input stream selector element"); } return input_selector_type; } static void gst_input_selector_base_init (GstInputSelectorClass * klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_set_details (element_class, &gst_input_selector_details); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_input_selector_sink_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_input_selector_src_factory)); } static void gst_input_selector_class_init (GstInputSelectorClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); gobject_class->dispose = gst_input_selector_dispose; gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_input_selector_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (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_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_object_class_install_property (gobject_class, PROP_SELECT_ALL, g_param_spec_boolean ("select-all", "Select all mode", "Forwards data from all input pads", FALSE, G_PARAM_READWRITE)); /** * 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_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. * * Since: 0.10.7 the signal changed from accepting the pad name to the pad * object. */ 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_selector_marshal_VOID__OBJECT_INT64_INT64, G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64); 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_internal_link_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_input_selector_get_linked_pads)); gst_pad_set_getcaps_function (sel->srcpad, GST_DEBUG_FUNCPTR (gst_input_selector_getcaps)); 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; sel->select_all = 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) { return (running_time - segment->accum) * segment->abs_rate + segment->start; } static void gst_segment_set_stop (GstSegment * segment, gint64 running_time) { segment->stop = gst_segment_get_timestamp (segment, running_time); segment->last_stop = -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->accum += duration; /* move position in the segment */ segment->time += duration; segment->start += duration; } /* this function must be called with the SELECTOR_LOCK. */ static void 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; 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 (stop_time == -1 && 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 %" G_GINT64_FORMAT, 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 %" G_GINT64_FORMAT, stop_time); gst_segment_set_stop (&self->segment, stop_time); self->pending_close = TRUE; } if (new && new->active && start_time >= 0) { GST_DEBUG_OBJECT (self, "setting start_time to %" G_GINT64_FORMAT, start_time); /* schedule a new segment push */ gst_segment_set_start (&new->segment, start_time); new->segment_pending = TRUE; } 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); g_object_notify (G_OBJECT (self), "active-pad"); } 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; } case PROP_SELECT_ALL: GST_INPUT_SELECTOR_LOCK (object); sel->select_all = g_value_get_boolean (value); GST_INPUT_SELECTOR_UNLOCK (object); 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; case PROP_SELECT_ALL: GST_INPUT_SELECTOR_LOCK (object); g_value_set_boolean (value, sel->select_all); 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 (GstPad * pad, gboolean strict) { GstInputSelector *sel; GstPad *otherpad = NULL; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); 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); gst_object_unref (sel); return otherpad; } static GstCaps * gst_input_selector_getcaps (GstPad * pad) { GstPad *otherpad; GstObject *parent; GstCaps *caps; parent = gst_object_get_parent (GST_OBJECT (pad)); if (GST_INPUT_SELECTOR (parent)->select_all) { caps = gst_pad_proxy_getcaps (pad); goto done; } otherpad = gst_input_selector_get_linked_pad (pad, FALSE); if (!otherpad) { GST_DEBUG_OBJECT (parent, "Pad %s:%s not linked, returning ANY", GST_DEBUG_PAD_NAME (pad)); caps = gst_caps_new_any (); } else { GST_DEBUG_OBJECT (parent, "Pad %s:%s is linked (to %s:%s), returning peer caps", GST_DEBUG_PAD_NAME (pad), 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))) caps = gst_caps_new_any (); gst_object_unref (otherpad); } done: gst_object_unref (parent); return caps; } /* check if the pad is the active sinkpad */ static gboolean gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad) { GstSelectorPad *selpad; gboolean res; selpad = GST_SELECTOR_PAD_CAST (pad); 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 */ 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 GList * gst_input_selector_get_linked_pads (GstPad * pad) { GstPad *otherpad; otherpad = gst_input_selector_get_linked_pad (pad, TRUE); if (!otherpad) return NULL; /* need to drop the ref, internal linked pads is not MT safe */ gst_object_unref (otherpad); return g_list_append (NULL, otherpad); } static GstPad * gst_input_selector_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * unused) { 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_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_chain)); gst_pad_set_internal_link_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_get_linked_pads)); gst_pad_set_bufferalloc_function (sinkpad, GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc)); 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)); 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 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); 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) { g_return_if_fail (self->blocked == TRUE); GST_INPUT_SELECTOR_LOCK (self); 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); } static gboolean gst_input_selector_check_eos (GstElement * selector) { GstIterator *it = gst_element_iterate_sink_pads (selector); GstIteratorResult ires; gpointer item; gboolean done = FALSE, is_eos = FALSE; GstSelectorPad *pad; while (!done) { ires = gst_iterator_next (it, &item); switch (ires) { case GST_ITERATOR_DONE: GST_INFO_OBJECT (selector, "all sink pads have eos"); done = TRUE; is_eos = TRUE; break; case GST_ITERATOR_OK: pad = GST_SELECTOR_PAD_CAST (item); if (!pad->eos) { done = TRUE; } break; case GST_ITERATOR_RESYNC: gst_iterator_resync (it); break; default: done = TRUE; break; } } gst_iterator_free (it); return is_eos; }