/* 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" #include "gst/glib-compat-private.h" #define DEBUG_CACHED_BUFFERS 0 GST_DEBUG_CATEGORY_STATIC (input_selector_debug); #define GST_CAT_DEFAULT input_selector_debug #define GST_TYPE_INPUT_SELECTOR_SYNC_MODE (gst_input_selector_sync_mode_get_type()) static GType gst_input_selector_sync_mode_get_type (void) { static GType type = 0; static const GEnumValue data[] = { {GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT, "Sync using the current active segment", "active-segment"}, {GST_INPUT_SELECTOR_SYNC_MODE_CLOCK, "Sync using the clock", "clock"}, {0, NULL, NULL}, }; if (!type) { type = g_enum_register_static ("GstInputSelectorSyncMode", data); } return type; } #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, PROP_SYNC_STREAMS, PROP_SYNC_MODE, PROP_CACHE_BUFFERS }; #define DEFAULT_SYNC_STREAMS FALSE #define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT #define DEFAULT_CACHE_BUFFERS FALSE #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 void gst_input_selector_active_pad_changed (GstInputSelector * sel, GParamSpec * pspec, gpointer user_data); 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; typedef struct _GstSelectorPadCachedBuffer GstSelectorPadCachedBuffer; 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; gboolean segment_update; GstSegment segment; /* the current segment on the pad */ GstTagList *tags; /* last tags received on the pad */ gboolean sending_cached_buffers; GQueue *cached_buffers; gboolean segment_pending; }; struct _GstSelectorPadCachedBuffer { GstBuffer *buffer; GstSegment segment; gboolean segment_update; }; 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 void gst_selector_pad_cache_buffer (GstSelectorPad * selpad, GstBuffer * buffer); static void gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad); static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event); static GstCaps *gst_selector_pad_getcaps (GstPad * pad); 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); 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 volatile gsize selector_pad_type = 0; 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, }; if (g_once_init_enter (&selector_pad_type)) { GType tmp = g_type_register_static (GST_TYPE_PAD, "GstSelectorPad", &selector_pad_info, 0); g_once_init_leave (&selector_pad_type, tmp); } return (GType) 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_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); gst_selector_pad_free_cached_buffers (pad); 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 " segment: %" GST_SEGMENT_FORMAT, GST_TIME_ARGS (ret), &pad->segment); return ret; } /* must be called with the SELECTOR_LOCK */ 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); pad->segment_update = FALSE; pad->sending_cached_buffers = FALSE; gst_selector_pad_free_cached_buffers (pad); GST_OBJECT_UNLOCK (pad); } static GstSelectorPadCachedBuffer * gst_selector_pad_new_cached_buffer (GstSelectorPad * selpad, GstBuffer * buffer) { GstSelectorPadCachedBuffer *cached_buffer = g_slice_new (GstSelectorPadCachedBuffer); cached_buffer->buffer = buffer; cached_buffer->segment = selpad->segment; cached_buffer->segment_update = selpad->segment_update; return cached_buffer; } static void gst_selector_pad_free_cached_buffer (GstSelectorPadCachedBuffer * cached_buffer) { gst_buffer_unref (cached_buffer->buffer); g_slice_free (GstSelectorPadCachedBuffer, cached_buffer); } /* must be called with the SELECTOR_LOCK */ static void gst_selector_pad_cache_buffer (GstSelectorPad * selpad, GstBuffer * buffer) { GST_DEBUG_OBJECT (selpad, "Caching buffer %p", buffer); if (!selpad->cached_buffers) selpad->cached_buffers = g_queue_new (); g_queue_push_tail (selpad->cached_buffers, gst_selector_pad_new_cached_buffer (selpad, buffer)); } /* must be called with the SELECTOR_LOCK */ static void gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad) { GstSelectorPadCachedBuffer *cached_buffer; if (!selpad->cached_buffers) return; GST_DEBUG_OBJECT (selpad, "Freeing cached buffers"); while ((cached_buffer = g_queue_pop_head (selpad->cached_buffers))) gst_selector_pad_free_cached_buffer (cached_buffer); g_queue_free (selpad->cached_buffers); selpad->cached_buffers = NULL; } /* 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; 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); it = gst_iterator_new_single (GST_TYPE_PAD, otherpad, (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref); 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_DEBUG_OBJECT (selpad, "received event %" GST_PTR_FORMAT, event); GST_INPUT_SELECTOR_LOCK (sel); prev_active_sinkpad = sel->active_sinkpad; active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); 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 (); } GST_INPUT_SELECTOR_LOCK (sel); active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* only forward if we are dealing with the active sinkpad */ forward = (pad == active_sinkpad); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: /* Unblock the pad if it's waiting */ selpad->flushing = TRUE; GST_INPUT_SELECTOR_BROADCAST (sel); break; case GST_EVENT_FLUSH_STOP: gst_selector_pad_reset (selpad); sel->pending_close = FALSE; GST_INPUT_SELECTOR_BROADCAST (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_segment_set_newsegment_full (&selpad->segment, update, rate, arate, format, start, stop, time); /* keep the segment update value to be used when resending cached * buffers if in sync-mode */ selpad->segment_update = update; /* 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; break; } case GST_EVENT_TAG: { GstTagList *tags, *oldtags, *newtags; gst_event_parse_tag (event, &tags); 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); g_object_notify (G_OBJECT (selpad), "tags"); break; } case GST_EVENT_EOS: selpad->eos = TRUE; if (forward) { selpad->eos_sent = TRUE; } else { GstSelectorPad *active_selpad; /* 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 */ active_selpad = GST_SELECTOR_PAD (active_sinkpad); forward = (active_selpad->eos && !active_selpad->eos_sent); active_selpad->eos_sent = TRUE; } GST_DEBUG_OBJECT (pad, "received EOS"); break; default: break; } GST_INPUT_SELECTOR_UNLOCK (sel); 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)); if (G_UNLIKELY (sel == NULL)) return gst_caps_new_any (); GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer"); caps = gst_pad_peer_get_caps_reffed (sel->srcpad); if (caps == NULL) caps = 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; } 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)); if (G_UNLIKELY (sel == NULL)) return GST_FLOW_WRONG_STATE; selpad = GST_SELECTOR_PAD_CAST (pad); GST_LOG_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) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (sel), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf); done: gst_object_unref (sel); return result; /* ERRORS */ not_active: { gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed; GST_INPUT_SELECTOR_UNLOCK (sel); /* unselected pad, perform fallback alloc or return unlinked when * asked */ GST_OBJECT_LOCK (selpad); if (selpad->always_ok || !active_pad_pushed || sel->cache_buffers) { 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, 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; } /* must be called without the SELECTOR_LOCK, will wait until the running time * of the active pad is after this pad or return TRUE when flushing */ static gboolean gst_input_selector_wait_running_time (GstInputSelector * sel, GstSelectorPad * selpad, GstBuffer * buf) { GstSegment *seg; GST_DEBUG_OBJECT (selpad, "entering wait for buffer %p", buf); /* If we have no valid timestamp we can't sync this buffer */ if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf)) { GST_DEBUG_OBJECT (selpad, "leaving wait for buffer with " "invalid timestamp"); return FALSE; } seg = &selpad->segment; /* Wait until * a) this is the active pad * b) the pad or the selector is flushing * c) the selector is not blocked * d) the buffer running time is before the current running time * (either active-seg or clock, depending on sync-mode) */ GST_INPUT_SELECTOR_LOCK (sel); while (TRUE) { GstPad *active_sinkpad; GstSelectorPad *active_selpad; GstClock *clock; gint64 cur_running_time; GstClockTime running_time; active_sinkpad = gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (selpad)); active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad); running_time = GST_BUFFER_TIMESTAMP (buf); /* If possible try to get the running time at the end of the buffer */ if (GST_BUFFER_DURATION_IS_VALID (buf)) running_time += GST_BUFFER_DURATION (buf); /* Only use the segment to convert to running time if the segment is * in TIME format, otherwise do our best to try to sync */ if (seg->format == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (seg->stop)) { if (running_time > seg->stop) { running_time = seg->stop; } running_time = gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time); /* If this is outside the segment don't sync */ if (running_time == -1) { GST_INPUT_SELECTOR_UNLOCK (sel); return FALSE; } } cur_running_time = GST_CLOCK_TIME_NONE; if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) { clock = gst_element_get_clock (GST_ELEMENT_CAST (sel)); if (clock) { GstClockTime base_time; cur_running_time = gst_clock_get_time (clock); base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel)); if (base_time <= cur_running_time) cur_running_time -= base_time; else cur_running_time = 0; } } else { GstSegment *active_seg; active_seg = &active_selpad->segment; /* Get active pad's running time, if no configured segment yet keep at -1 */ if (active_seg->format == GST_FORMAT_TIME) cur_running_time = gst_segment_to_running_time (active_seg, GST_FORMAT_TIME, active_seg->last_stop); } if (selpad != active_selpad && !sel->flushing && !selpad->flushing && (sel->cache_buffers || active_selpad->pushed) && (sel->blocked || cur_running_time == -1 || running_time >= cur_running_time)) { if (!sel->blocked) GST_DEBUG_OBJECT (selpad, "Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %" GST_TIME_FORMAT, GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time)); GST_INPUT_SELECTOR_WAIT (sel); } else { GST_INPUT_SELECTOR_UNLOCK (sel); break; } } /* Return TRUE if the selector or the pad is flushing */ return (sel->flushing || selpad->flushing); } #if DEBUG_CACHED_BUFFERS static void gst_input_selector_debug_cached_buffers (GstInputSelector * sel) { GList *walk; for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) { GstSelectorPad *selpad; GString *timestamps; gchar *str; int i; selpad = GST_SELECTOR_PAD_CAST (walk->data); if (!selpad->cached_buffers) { GST_DEBUG_OBJECT (selpad, "Cached buffers timestamps: "); continue; } timestamps = g_string_new ("Cached buffers timestamps:"); for (i = 0; i < selpad->cached_buffers->length; ++i) { GstSelectorPadCachedBuffer *cached_buffer; cached_buffer = g_queue_peek_nth (selpad->cached_buffers, i); g_string_append_printf (timestamps, " %" GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (cached_buffer->buffer))); } str = g_string_free (timestamps, FALSE); GST_DEBUG_OBJECT (selpad, str); g_free (str); } } #endif /* must be called with the SELECTOR_LOCK */ static void gst_input_selector_cleanup_old_cached_buffers (GstInputSelector * sel, GstPad * pad) { GstSelectorPad *selpad; GstSegment *seg; GstClock *clock; gint64 cur_running_time; GList *walk; selpad = GST_SELECTOR_PAD_CAST (pad); seg = &selpad->segment; cur_running_time = GST_CLOCK_TIME_NONE; if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) { clock = gst_element_get_clock (GST_ELEMENT_CAST (sel)); if (clock) { GstClockTime base_time; cur_running_time = gst_clock_get_time (clock); base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel)); if (base_time <= cur_running_time) cur_running_time -= base_time; else cur_running_time = 0; } } else { GstPad *active_sinkpad; GstSelectorPad *active_selpad; GstSegment *active_seg; active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad); active_seg = &active_selpad->segment; /* Get active pad's running time, if no configured segment yet keep at -1 */ if (active_seg->format == GST_FORMAT_TIME) cur_running_time = gst_segment_to_running_time (active_seg, GST_FORMAT_TIME, active_seg->last_stop); } if (!GST_CLOCK_TIME_IS_VALID (cur_running_time)) return; GST_DEBUG_OBJECT (sel, "Cleaning up old cached buffers"); for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) { GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data); GstSelectorPadCachedBuffer *cached_buffer; GSList *maybe_remove; guint queue_position; if (!selpad->cached_buffers) continue; maybe_remove = NULL; queue_position = 0; while ((cached_buffer = g_queue_peek_nth (selpad->cached_buffers, queue_position))) { GstBuffer *buffer = cached_buffer->buffer; GstClockTime running_time; GSList *l; /* If we have no valid timestamp we can't sync this buffer */ if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) { maybe_remove = g_slist_append (maybe_remove, cached_buffer); queue_position = g_slist_length (maybe_remove); continue; } /* the buffer is still valid if its duration is valid and the * timestamp + duration is >= time, or if its duration is invalid * and the timestamp is >= time */ running_time = GST_BUFFER_TIMESTAMP (buffer); /* If possible try to get the running time at the end of the buffer */ if (GST_BUFFER_DURATION_IS_VALID (buffer)) running_time += GST_BUFFER_DURATION (buffer); /* Only use the segment to convert to running time if the segment is * in TIME format, otherwise do our best to try to sync */ if (seg->format == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (seg->stop)) { if (running_time > seg->stop) { running_time = seg->stop; } running_time = gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time); } GST_DEBUG_OBJECT (selpad, "checking if buffer %p running time=%" GST_TIME_FORMAT " >= stream time=%" GST_TIME_FORMAT, buffer, GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time)); if (running_time >= cur_running_time) { break; } GST_DEBUG_OBJECT (selpad, "Removing old cached buffer %p", buffer); g_queue_pop_nth (selpad->cached_buffers, queue_position); gst_selector_pad_free_cached_buffer (cached_buffer); for (l = maybe_remove; l != NULL; l = g_slist_next (l)) { /* A buffer after some invalid buffers was removed, it means the invalid buffers * are old, lets also remove them */ cached_buffer = l->data; g_queue_remove (selpad->cached_buffers, cached_buffer); gst_selector_pad_free_cached_buffer (cached_buffer); } g_slist_free (maybe_remove); maybe_remove = NULL; queue_position = 0; } g_slist_free (maybe_remove); maybe_remove = NULL; if (g_queue_is_empty (selpad->cached_buffers)) { g_queue_free (selpad->cached_buffers); selpad->cached_buffers = NULL; } } #if DEBUG_CACHED_BUFFERS gst_input_selector_debug_cached_buffers (sel); #endif } 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 *close_event = NULL, *start_event = NULL; GstCaps *caps; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); selpad = GST_SELECTOR_PAD_CAST (pad); seg = &selpad->segment; GST_DEBUG_OBJECT (selpad, "entering chain for buf %p with timestamp %" GST_TIME_FORMAT, buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); GST_INPUT_SELECTOR_LOCK (sel); /* wait or check for flushing */ if (gst_input_selector_wait (sel, selpad)) { GST_INPUT_SELECTOR_UNLOCK (sel); goto flushing; } GST_LOG_OBJECT (pad, "getting active pad"); prev_active_sinkpad = sel->active_sinkpad; active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* In sync mode wait until the active pad has advanced * after the running time of the current buffer */ if (sel->sync_streams) { /* call chain for each cached buffer if we are not the active pad * or if we are the active pad but didn't push anything yet. */ if (active_sinkpad != pad || !selpad->pushed) { /* no need to check for sel->cache_buffers as selpad->cached_buffers * will only be valid if cache_buffers is TRUE */ if (selpad->cached_buffers && !selpad->sending_cached_buffers) { GstSelectorPadCachedBuffer *cached_buffer; GstSegment saved_segment; gboolean saved_segment_update; saved_segment = selpad->segment; saved_segment_update = selpad->segment_update; selpad->sending_cached_buffers = TRUE; while (!sel->flushing && !selpad->flushing && (cached_buffer = g_queue_pop_head (selpad->cached_buffers))) { GST_DEBUG_OBJECT (pad, "Cached buffers found, " "invoking chain for cached buffer %p", cached_buffer->buffer); selpad->segment = cached_buffer->segment; selpad->segment_update = cached_buffer->segment_update; selpad->segment_pending = TRUE; GST_INPUT_SELECTOR_UNLOCK (sel); gst_selector_pad_chain (pad, cached_buffer->buffer); GST_INPUT_SELECTOR_LOCK (sel); /* we may have cleaned up the queue in the meantime because of * old buffers */ if (!selpad->cached_buffers) { break; } } selpad->sending_cached_buffers = FALSE; /* all cached buffers sent, restore segment for current buffer */ selpad->segment = saved_segment; selpad->segment_update = saved_segment_update; selpad->segment_pending = TRUE; /* Might have changed while calling chain for cached buffers */ active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); } } if (active_sinkpad != pad) { GST_INPUT_SELECTOR_UNLOCK (sel); if (gst_input_selector_wait_running_time (sel, selpad, buf)) goto flushing; GST_INPUT_SELECTOR_LOCK (sel); } /* Might have changed while waiting */ 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); gst_segment_set_last_stop (seg, seg->format, start_time); GST_OBJECT_UNLOCK (pad); } /* Ignore buffers from pads except the selected one */ if (pad != active_sinkpad) goto ignore; /* Tell all non-active pads that we advanced the running time */ if (sel->sync_streams) GST_INPUT_SELECTOR_BROADCAST (sel); if (G_UNLIKELY (sel->pending_close)) { GstSegment *cseg = &sel->segment; GST_DEBUG_OBJECT (sel, "pushing close 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)) { if (G_UNLIKELY (seg->format == GST_FORMAT_UNDEFINED)) { GST_ERROR_OBJECT (pad, "buffers arrived before NEWSEGMENT event"); } else { gboolean update = FALSE; if (sel->sync_streams && sel->cache_buffers) { /* if we didn't push anything on this pad after it became active, send an * update FALSE to reset the segments, otherwise use whatever is in the * selpad current segment update value */ update = selpad->pushed ? selpad->segment_update : FALSE; } 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, update, seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop, seg->time); start_event = gst_event_new_new_segment_full (update, 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) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (sel), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } 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_LOG_OBJECT (pad, "Forwarding buffer %p with timestamp %" GST_TIME_FORMAT, buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); if ((caps = GST_BUFFER_CAPS (buf))) { if (GST_PAD_CAPS (sel->srcpad) != caps) gst_pad_set_caps (sel->srcpad, caps); } res = gst_pad_push (sel->srcpad, gst_buffer_ref (buf)); GST_LOG_OBJECT (pad, "Buffer %p forwarded result=%d", buf, res); GST_INPUT_SELECTOR_LOCK (sel); if (sel->sync_streams && sel->cache_buffers) { /* Might have changed while pushing */ active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad); /* only set pad to pushed if we are still the active pad */ if (active_sinkpad == pad) selpad->pushed = TRUE; /* cache buffer as we may need it again if we change pads */ gst_selector_pad_cache_buffer (selpad, buf); gst_input_selector_cleanup_old_cached_buffers (sel, pad); } else { selpad->pushed = TRUE; gst_buffer_unref (buf); } GST_INPUT_SELECTOR_UNLOCK (sel); 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 or buffer timestamp is invalid, " "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_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); 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); /* 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(bla) \ GST_DEBUG_CATEGORY_INIT (input_selector_debug, \ "input-selector", 0, "An input stream selector element"); GST_BOILERPLATE_FULL (GstInputSelector, gst_input_selector, GstElement, GST_TYPE_ELEMENT, _do_init); static void gst_input_selector_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (element_class, "Input selector", "Generic", "N-to-1 input stream selector", "Julien Moutte , " "Jan Schmidt , " "Wim Taymans "); 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); 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:sync-streams * * If set to %TRUE all inactive streams will be synced to the * running time of the active stream or to the current clock. * * To make sure no buffers are dropped by input-selector * that might be needed when switching the active pad, * sync-mode should be set to "clock" and cache-buffers to TRUE. * * Since: 0.10.36 */ g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS, g_param_spec_boolean ("sync-streams", "Sync Streams", "Synchronize inactive streams to the running time of the active " "stream or to the current clock", DEFAULT_SYNC_STREAMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_MUTABLE_READY)); /** * GstInputSelector:sync-mode * * Select how input-selector will sync buffers when in sync-streams mode. * * Note that when using the "active-segment" mode, the "active-segment" may * be ahead of current clock time when switching the active pad, as the current * active pad may have pushed more buffers than what was displayed/consumed, * which may cause delays and some missing buffers. * * Since: 0.10.36 */ g_object_class_install_property (gobject_class, PROP_SYNC_MODE, g_param_spec_enum ("sync-mode", "Sync mode", "Behavior in sync-streams mode", GST_TYPE_INPUT_SELECTOR_SYNC_MODE, DEFAULT_SYNC_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_MUTABLE_READY)); /** * GstInputSelector:cache-buffers * * If set to %TRUE and GstInputSelector:sync-streams is also set to %TRUE, * the active pad will cache the buffers still considered valid (after current * running time, see sync-mode) to avoid missing frames if/when the pad is * reactivated. * * The active pad may push more buffers than what is currently displayed/consumed * and when changing pads those buffers will be discarded and the only way to * reactivate that pad without loosing the already consumed buffers is to enable cache. */ g_object_class_install_property (gobject_class, PROP_CACHE_BUFFERS, g_param_spec_boolean ("cache-buffers", "Cache Buffers", "Cache buffers for active-pad", DEFAULT_CACHE_BUFFERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_MUTABLE_READY)); /** * 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); 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, GstInputSelectorClass * g_class) { 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->sync_streams = DEFAULT_SYNC_STREAMS; sel->lock = g_mutex_new (); sel->cond = g_cond_new (); sel->blocked = FALSE; /* lets give a change for downstream to do something on * active-pad change before we start pushing new buffers */ g_signal_connect_data (sel, "notify::active-pad", (GCallback) gst_input_selector_active_pad_changed, NULL, NULL, G_CONNECT_AFTER); } 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->accum) return segment->start; else 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 (!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. */ self->segment = old->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) { /* schedule a new segment push */ if (self->sync_streams && self->cache_buffers) start_time = gst_selector_pad_get_running_time (new); 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); #if DEBUG_CACHED_BUFFERS gst_input_selector_debug_cached_buffers (sel); #endif gst_input_selector_set_active_pad (sel, pad, GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE); #if DEBUG_CACHED_BUFFERS gst_input_selector_debug_cached_buffers (sel); #endif GST_INPUT_SELECTOR_UNLOCK (sel); break; } case PROP_SYNC_STREAMS: GST_INPUT_SELECTOR_LOCK (sel); sel->sync_streams = g_value_get_boolean (value); GST_INPUT_SELECTOR_UNLOCK (sel); break; case PROP_SYNC_MODE: GST_INPUT_SELECTOR_LOCK (sel); sel->sync_mode = g_value_get_enum (value); GST_INPUT_SELECTOR_UNLOCK (sel); break; case PROP_CACHE_BUFFERS: GST_INPUT_SELECTOR_LOCK (object); sel->cache_buffers = 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_active_pad_changed (GstInputSelector * sel, GParamSpec * pspec, gpointer user_data) { /* Wake up all non-active pads in sync mode, they might be * the active pad now */ if (sel->sync_streams) GST_INPUT_SELECTOR_BROADCAST (sel); } 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_SYNC_STREAMS: GST_INPUT_SELECTOR_LOCK (object); g_value_set_boolean (value, sel->sync_streams); GST_INPUT_SELECTOR_UNLOCK (object); break; case PROP_SYNC_MODE: GST_INPUT_SELECTOR_LOCK (object); g_value_set_enum (value, sel->sync_mode); GST_INPUT_SELECTOR_UNLOCK (object); break; case PROP_CACHE_BUFFERS: GST_INPUT_SELECTOR_LOCK (object); g_value_set_boolean (value, sel->cache_buffers); 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) { GstPad *otherpad; GstInputSelector *sel; GstCaps *caps; sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad)); if (G_UNLIKELY (sel == NULL)) return 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 = 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_reffed (otherpad))) caps = 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) { 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_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) { NOTIFY_MUTEX_LOCK (); g_object_notify (G_OBJECT (self), "active-pad"); NOTIFY_MUTEX_UNLOCK (); } }