diff -r 71e347f905f2 -r 4a7fac7dd34a gst_plugins_base/gst/playback/gstinputselector.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gst_plugins_base/gst/playback/gstinputselector.c Fri Apr 16 15:15:52 2010 +0300 @@ -0,0 +1,1433 @@ +/* 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 + * @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 "gstplay-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 +}; + +#define DEFAULT_PAD_ALWAYS_OK TRUE + +enum +{ + PROP_PAD_0, + PROP_PAD_RUNNING_TIME, + PROP_PAD_TAGS, + PROP_PAD_ACTIVE, + PROP_PAD_ALWAYS_OK, + 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 */ + 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; +}; + +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 void gst_selector_pad_set_property (GObject * object, + guint prop_id, const 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); + +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, "GstPlaybin2SelectorPad", + &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); + gobject_class->set_property = + GST_DEBUG_FUNCPTR (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_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)); + 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)); +} + +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 (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 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; + pad->discont = 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; + GstPad *prev_active_sinkpad; + GstPad *active_sinkpad; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + 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 or if select_all + * is enabled */ + if (pad != active_sinkpad && !sel->select_all) + forward = FALSE; + GST_INPUT_SELECTOR_UNLOCK (sel); + + if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) + g_object_notify (G_OBJECT (sel), "active-pad"); + + 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); + + /* If we aren't forwarding the event (because the pad is not the + * active_sinkpad, and select_all is not set, then set the flag on the + * 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; + 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; + GstPad *prev_active_sinkpad; + GstSelectorPad *selpad; + + sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); + selpad = GST_SELECTOR_PAD_CAST (pad); + + GST_DEBUG_OBJECT (pad, "received alloc"); + + GST_INPUT_SELECTOR_LOCK (sel); + prev_active_sinkpad = sel->active_sinkpad; + active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); + + if (pad != active_sinkpad) + goto not_active; + + GST_INPUT_SELECTOR_UNLOCK (sel); + + if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) + g_object_notify (G_OBJECT (sel), "active-pad"); + + result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf); + +done: + gst_object_unref (sel); + + return result; + + /* ERRORS */ +not_active: + { + GST_INPUT_SELECTOR_UNLOCK (sel); + + /* unselected pad, perform fallback alloc or return unlinked when + * asked */ + GST_OBJECT_LOCK (selpad); + if (selpad->always_ok) { + GST_DEBUG_OBJECT (pad, "Not selected, performing fallback allocation"); + *buf = NULL; + result = GST_FLOW_OK; + } else { + GST_DEBUG_OBJECT (pad, "Not selected, return NOT_LINKED"); + result = GST_FLOW_NOT_LINKED; + } + GST_OBJECT_UNLOCK (selpad); + + goto done; + } +} + +/* 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; + GstPad *prev_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"); + + prev_active_sinkpad = sel->active_sinkpad; + 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) + 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 (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) + g_object_notify (G_OBJECT (sel), "active-pad"); + + 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); + + /* figure out what to return upstream */ + GST_OBJECT_LOCK (selpad); + if (selpad->always_ok) + 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_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 GstCaps *gst_input_selector_getcaps (GstPad * pad); +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); + +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, + "GstPlaybin2InputSelector", &input_selector_info, 0); + GST_DEBUG_CATEGORY_INIT (input_selector_debug, + "playbin2-input-selector", 0, "Playbin2 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_play_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_play_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_selector_pad_get_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; + + 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. 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 (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); + + 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; + } + 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 gboolean +gst_input_selector_event (GstPad * pad, GstEvent * event) +{ + gboolean res = FALSE; + GstPad *otherpad; + + otherpad = gst_input_selector_get_linked_pad (pad, TRUE); + + if (otherpad) { + res = gst_pad_push_event (otherpad, event); + + gst_object_unref (otherpad); + } else + gst_event_unref (event); + 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)); + + otherpad = gst_input_selector_get_linked_pad (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) +{ + GstPad *otherpad; + GstObject *parent; + GstCaps *caps; + + parent = gst_object_get_parent (GST_OBJECT (pad)); + + otherpad = gst_input_selector_get_linked_pad (pad, FALSE); + + if (!otherpad) { + if (GST_INPUT_SELECTOR (parent)->select_all) { + GST_DEBUG_OBJECT (parent, + "Pad %s:%s not linked, returning merge of caps", + GST_DEBUG_PAD_NAME (pad)); + caps = gst_pad_proxy_getcaps (pad); + } else { + 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); + } + + 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 || sel->select_all) { + /* first pad we get activity on becomes the activated pad by default, if we + * select all, we also remember the last used pad. */ + 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) +{ + 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)); + 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) + g_object_notify (G_OBJECT (self), "active-pad"); +} + +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; + } + gst_object_unref (pad); + break; + case GST_ITERATOR_RESYNC: + gst_iterator_resync (it); + break; + default: + done = TRUE; + break; + } + } + gst_iterator_free (it); + + return is_eos; +}