/* GStreamer * Copyright (C) 2006 Edward Hervey * Copyright (C) 2007 Jan Schmidt * Copyright (C) 2007 Wim Taymans * * gstmultiqueue.c: * * 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-multiqueue * @see_also: #GstQueue * * * * Multiqueue is similar to a normal #GstQueue with the following additional * features: * * * Multiple streamhandling * * The element handles queueing data on more than one stream at once. To * achieve such a feature it has request sink pads (sink%d) and * 'sometimes' src pads (src%d). * * When requesting a given sinkpad with gst_element_get_request_pad(), * the associated srcpad for that stream will be created. * Example: requesting sink1 will generate src1. * * * * * Non-starvation on multiple streams * * If more than one stream is used with the element, the streams' queues * will be dynamically grown (up to a limit), in order to ensure that no * stream is risking data starvation. This guarantees that at any given * time there are at least N bytes queued and available for each individual * stream. * * If an EOS event comes through a srcpad, the associated queue will be * considered as 'not-empty' in the queue-size-growing algorithm. * * * * * Non-linked srcpads graceful handling * * In order to better support dynamic switching between streams, the multiqueue * (unlike the current GStreamer queue) continues to push buffers on non-linked * pads rather than shutting down. * * In addition, to prevent a non-linked stream from very quickly consuming all * available buffers and thus 'racing ahead' of the other streams, the element * must ensure that buffers and inlined events for a non-linked stream are pushed * in the same order as they were received, relative to the other streams * controlled by the element. This means that a buffer cannot be pushed to a * non-linked pad any sooner than buffers in any other stream which were received * before it. * * * * * * * Data is queued until one of the limits specified by the * #GstMultiQueue:max-size-buffers, #GstMultiQueue:max-size-bytes and/or * #GstMultiQueue:max-size-time properties has been reached. Any attempt to push * more buffers into the queue will block the pushing thread until more space * becomes available. #GstMultiQueue:extra-size-buffers, * * * #GstMultiQueue:extra-size-bytes and #GstMultiQueue:extra-size-time are * currently unused. * * * The default queue size limits are 5 buffers, 10MB of data, or * two second worth of data, whichever is reached first. Note that the number * of buffers will dynamically grow depending on the fill level of * other queues. * * * The #GstMultiQueue::underrun signal is emitted when all of the queues * are empty. The #GstMultiQueue::overrun signal is emitted when one of the * queues is filled. * Both signals are emitted from the context of the streaming thread. * * * * Last reviewed on 2008-01-25 (0.10.17) */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include "gstmultiqueue.h" /** * GstSingleQueue: * @sinkpad: associated sink #GstPad * @srcpad: associated source #GstPad * * Structure containing all information and properties about * a single queue. */ typedef struct _GstSingleQueue GstSingleQueue; struct _GstSingleQueue { /* unique identifier of the queue */ guint id; GstMultiQueue *mqueue; GstPad *sinkpad; GstPad *srcpad; /* flowreturn of previous srcpad push */ GstFlowReturn srcresult; GstSegment sink_segment; GstSegment src_segment; /* queue of data */ GstDataQueue *queue; GstDataQueueSize max_size, extra_size; GstClockTime cur_time; gboolean is_eos; gboolean inextra; /* TRUE if the queue is currently in extradata mode */ /* Protected by global lock */ guint32 nextid; /* ID of the next object waiting to be pushed */ guint32 oldid; /* ID of the last object pushed (last in a series) */ GCond *turn; /* SingleQueue turn waiting conditional */ }; /* Extension of GstDataQueueItem structure for our usage */ typedef struct _GstMultiQueueItem GstMultiQueueItem; struct _GstMultiQueueItem { GstMiniObject *object; guint size; guint64 duration; gboolean visible; GDestroyNotify destroy; guint32 posid; }; static GstSingleQueue *gst_single_queue_new (GstMultiQueue * mqueue); static void gst_single_queue_free (GstSingleQueue * squeue); static void wake_up_next_non_linked (GstMultiQueue * mq); static void compute_high_id (GstMultiQueue * mq); static void single_queue_overrun_cb (GstDataQueue * dq, GstSingleQueue * sq); static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src%d", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); GST_DEBUG_CATEGORY_STATIC (multi_queue_debug); #define GST_CAT_DEFAULT (multi_queue_debug) /* default limits, we try to keep up to 2 seconds of data and if there is not * time, up to 10 MB. The number of buffers is dynamically scaled to make sure * there is data in the queues. Normally, the byte and time limits are not hit * in theses conditions. */ #define DEFAULT_MAX_SIZE_BYTES 10 * 1024 * 1024 /* 10 MB */ #define DEFAULT_MAX_SIZE_BUFFERS 5 #define DEFAULT_MAX_SIZE_TIME 2 * GST_SECOND /* second limits. When we hit one of the above limits we are probably dealing * with a badly muxed file and we scale the limits to these emergency values. * This is currently not yet implemented. */ #define DEFAULT_EXTRA_SIZE_BYTES 10 * 1024 * 1024 /* 10 MB */ #define DEFAULT_EXTRA_SIZE_BUFFERS 5 #define DEFAULT_EXTRA_SIZE_TIME 3 * GST_SECOND /* Signals and args */ enum { SIGNAL_UNDERRUN, SIGNAL_OVERRUN, LAST_SIGNAL }; enum { ARG_0, ARG_EXTRA_SIZE_BYTES, ARG_EXTRA_SIZE_BUFFERS, ARG_EXTRA_SIZE_TIME, ARG_MAX_SIZE_BYTES, ARG_MAX_SIZE_BUFFERS, ARG_MAX_SIZE_TIME, }; #define GST_MULTI_QUEUE_MUTEX_LOCK(q) G_STMT_START { \ g_mutex_lock (q->qlock); \ } G_STMT_END #define GST_MULTI_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \ g_mutex_unlock (q->qlock); \ } G_STMT_END static void gst_multi_queue_finalize (GObject * object); static void gst_multi_queue_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_multi_queue_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstPad *gst_multi_queue_request_new_pad (GstElement * element, GstPadTemplate * temp, const gchar * name); static void gst_multi_queue_release_pad (GstElement * element, GstPad * pad); static void gst_multi_queue_loop (GstPad * pad); #define _do_init(bla) \ GST_DEBUG_CATEGORY_INIT (multi_queue_debug, "multiqueue", 0, "multiqueue element"); GST_BOILERPLATE_FULL (GstMultiQueue, gst_multi_queue, GstElement, GST_TYPE_ELEMENT, _do_init); static guint gst_multi_queue_signals[LAST_SIGNAL] = { 0 }; static void gst_multi_queue_base_init (gpointer g_class) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (gstelement_class, "MultiQueue", "Generic", "Multiple data queue", "Edward Hervey "); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sinktemplate)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&srctemplate)); } static void gst_multi_queue_class_init (GstMultiQueueClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_multi_queue_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_multi_queue_get_property); /* SIGNALS */ /** * GstMultiQueue::underrun: * @multiqueue: the multqueue instance * * This signal is emitted from the streaming thread when there is * no data in any of the queues inside the multiqueue instance (underrun). * * This indicates either starvation or EOS from the upstream data sources. */ gst_multi_queue_signals[SIGNAL_UNDERRUN] = g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstMultiQueueClass, underrun), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GstMultiQueue::overrun: * @multiqueue: the multiqueue instance * * Reports that one of the queues in the multiqueue is full (overrun). * A queue is full if the total amount of data inside it (num-buffers, time, * size) is higher than the boundary values which can be set through the * GObject properties. * * This can be used as an indicator of pre-roll. */ gst_multi_queue_signals[SIGNAL_OVERRUN] = g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstMultiQueueClass, overrun), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); /* PROPERTIES */ g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BYTES, g_param_spec_uint ("max-size-bytes", "Max. size (kB)", "Max. amount of data in the queue (bytes, 0=disable)", 0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BUFFERS, g_param_spec_uint ("max-size-buffers", "Max. size (buffers)", "Max. number of buffers in the queue (0=disable)", 0, G_MAXUINT, DEFAULT_MAX_SIZE_BUFFERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_MAX_SIZE_TIME, g_param_spec_uint64 ("max-size-time", "Max. size (ns)", "Max. amount of data in the queue (in ns, 0=disable)", 0, G_MAXUINT64, DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_EXTRA_SIZE_BYTES, g_param_spec_uint ("extra-size-bytes", "Extra Size (kB)", "Amount of data the queues can grow if one of them is empty (bytes, 0=disable)", 0, G_MAXUINT, DEFAULT_EXTRA_SIZE_BYTES, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_EXTRA_SIZE_BUFFERS, g_param_spec_uint ("extra-size-buffers", "Extra Size (buffers)", "Amount of buffers the queues can grow if one of them is empty (0=disable)", 0, G_MAXUINT, DEFAULT_EXTRA_SIZE_BUFFERS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, ARG_EXTRA_SIZE_TIME, g_param_spec_uint64 ("extra-size-time", "Extra Size (ns)", "Amount of time the queues can grow if one of them is empty (in ns, 0=disable)", 0, G_MAXUINT64, DEFAULT_EXTRA_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_multi_queue_finalize); gstelement_class->request_new_pad = GST_DEBUG_FUNCPTR (gst_multi_queue_request_new_pad); gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_multi_queue_release_pad); } static void gst_multi_queue_init (GstMultiQueue * mqueue, GstMultiQueueClass * klass) { mqueue->nbqueues = 0; mqueue->queues = NULL; mqueue->max_size.bytes = DEFAULT_MAX_SIZE_BYTES; mqueue->max_size.visible = DEFAULT_MAX_SIZE_BUFFERS; mqueue->max_size.time = DEFAULT_MAX_SIZE_TIME; mqueue->extra_size.bytes = DEFAULT_EXTRA_SIZE_BYTES; mqueue->extra_size.visible = DEFAULT_EXTRA_SIZE_BUFFERS; mqueue->extra_size.time = DEFAULT_EXTRA_SIZE_TIME; mqueue->counter = 1; mqueue->highid = -1; mqueue->nextnotlinked = -1; mqueue->qlock = g_mutex_new (); } static void gst_multi_queue_finalize (GObject * object) { GstMultiQueue *mqueue = GST_MULTI_QUEUE (object); g_list_foreach (mqueue->queues, (GFunc) gst_single_queue_free, NULL); g_list_free (mqueue->queues); mqueue->queues = NULL; /* free/unref instance data */ g_mutex_free (mqueue->qlock); G_OBJECT_CLASS (parent_class)->finalize (object); } #define SET_CHILD_PROPERTY(mq,format) G_STMT_START { \ GList * tmp = mq->queues; \ while (tmp) { \ GstSingleQueue *q = (GstSingleQueue*)tmp->data; \ q->max_size.format = mq->max_size.format; \ tmp = g_list_next(tmp); \ }; \ } G_STMT_END static void gst_multi_queue_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstMultiQueue *mq = GST_MULTI_QUEUE (object); switch (prop_id) { case ARG_MAX_SIZE_BYTES: GST_MULTI_QUEUE_MUTEX_LOCK (mq); mq->max_size.bytes = g_value_get_uint (value); SET_CHILD_PROPERTY (mq, bytes); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); break; case ARG_MAX_SIZE_BUFFERS: GST_MULTI_QUEUE_MUTEX_LOCK (mq); mq->max_size.visible = g_value_get_uint (value); SET_CHILD_PROPERTY (mq, visible); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); break; case ARG_MAX_SIZE_TIME: GST_MULTI_QUEUE_MUTEX_LOCK (mq); mq->max_size.time = g_value_get_uint64 (value); SET_CHILD_PROPERTY (mq, time); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); break; case ARG_EXTRA_SIZE_BYTES: mq->extra_size.bytes = g_value_get_uint (value); break; case ARG_EXTRA_SIZE_BUFFERS: mq->extra_size.visible = g_value_get_uint (value); break; case ARG_EXTRA_SIZE_TIME: mq->extra_size.time = g_value_get_uint64 (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_multi_queue_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstMultiQueue *mq = GST_MULTI_QUEUE (object); GST_MULTI_QUEUE_MUTEX_LOCK (mq); switch (prop_id) { case ARG_EXTRA_SIZE_BYTES: g_value_set_uint (value, mq->extra_size.bytes); break; case ARG_EXTRA_SIZE_BUFFERS: g_value_set_uint (value, mq->extra_size.visible); break; case ARG_EXTRA_SIZE_TIME: g_value_set_uint64 (value, mq->extra_size.time); break; case ARG_MAX_SIZE_BYTES: g_value_set_uint (value, mq->max_size.bytes); break; case ARG_MAX_SIZE_BUFFERS: g_value_set_uint (value, mq->max_size.visible); break; case ARG_MAX_SIZE_TIME: g_value_set_uint64 (value, mq->max_size.time); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); } static GList * gst_multi_queue_get_internal_links (GstPad * pad) { GList *res = NULL; GstMultiQueue *mqueue; GstSingleQueue *sq = NULL; GList *tmp; g_return_val_if_fail (GST_IS_PAD (pad), NULL); mqueue = GST_MULTI_QUEUE (GST_PAD_PARENT (pad)); if (!mqueue) goto no_parent; GST_MULTI_QUEUE_MUTEX_LOCK (mqueue); /* Find which single queue it belongs to */ for (tmp = mqueue->queues; tmp && !res; tmp = g_list_next (tmp)) { sq = (GstSingleQueue *) tmp->data; if (sq->sinkpad == pad) res = g_list_prepend (res, sq->srcpad); if (sq->srcpad == pad) res = g_list_prepend (res, sq->sinkpad); } if (!res) GST_WARNING_OBJECT (mqueue, "That pad doesn't belong to this element ???"); GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue); return res; no_parent: { GST_DEBUG_OBJECT (pad, "no parent"); return NULL; } } /* * GstElement methods */ static GstPad * gst_multi_queue_request_new_pad (GstElement * element, GstPadTemplate * temp, const gchar * name) { GstMultiQueue *mqueue = GST_MULTI_QUEUE (element); GstSingleQueue *squeue; GST_LOG_OBJECT (element, "name : %s", GST_STR_NULL (name)); /* Create a new single queue, add the sink and source pad and return the sink pad */ squeue = gst_single_queue_new (mqueue); GST_MULTI_QUEUE_MUTEX_LOCK (mqueue); mqueue->queues = g_list_append (mqueue->queues, squeue); GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue); GST_DEBUG_OBJECT (mqueue, "Returning pad %s:%s", GST_DEBUG_PAD_NAME (squeue->sinkpad)); return squeue->sinkpad; } static void gst_multi_queue_release_pad (GstElement * element, GstPad * pad) { GstMultiQueue *mqueue = GST_MULTI_QUEUE (element); GstSingleQueue *sq = NULL; GList *tmp; GST_LOG_OBJECT (element, "pad %s:%s", GST_DEBUG_PAD_NAME (pad)); GST_MULTI_QUEUE_MUTEX_LOCK (mqueue); /* Find which single queue it belongs to, knowing that it should be a sinkpad */ for (tmp = mqueue->queues; tmp; tmp = g_list_next (tmp)) { sq = (GstSingleQueue *) tmp->data; if (sq->sinkpad == pad) break; } if (!tmp) { GST_WARNING_OBJECT (mqueue, "That pad doesn't belong to this element ???"); GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue); return; } /* FIXME: The removal of the singlequeue should probably not happen until it * finishes draining */ /* remove it from the list */ mqueue->queues = g_list_delete_link (mqueue->queues, tmp); /* FIXME : recompute next-non-linked */ GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue); /* delete SingleQueue */ gst_data_queue_set_flushing (sq->queue, TRUE); gst_pad_set_active (sq->srcpad, FALSE); gst_pad_set_active (sq->sinkpad, FALSE); gst_element_remove_pad (element, sq->srcpad); gst_element_remove_pad (element, sq->sinkpad); gst_single_queue_free (sq); } static gboolean gst_single_queue_flush (GstMultiQueue * mq, GstSingleQueue * sq, gboolean flush) { gboolean result; GST_DEBUG_OBJECT (mq, "flush %s queue %d", (flush ? "start" : "stop"), sq->id); if (flush) { sq->srcresult = GST_FLOW_WRONG_STATE; gst_data_queue_set_flushing (sq->queue, TRUE); /* wake up non-linked task */ GST_LOG_OBJECT (mq, "SingleQueue %d : waking up eventually waiting task", sq->id); GST_MULTI_QUEUE_MUTEX_LOCK (mq); g_cond_signal (sq->turn); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); GST_LOG_OBJECT (mq, "SingleQueue %d : pausing task", sq->id); result = gst_pad_pause_task (sq->srcpad); } else { gst_data_queue_flush (sq->queue); gst_segment_init (&sq->sink_segment, GST_FORMAT_TIME); gst_segment_init (&sq->src_segment, GST_FORMAT_TIME); /* All pads start off not-linked for a smooth kick-off */ sq->srcresult = GST_FLOW_OK; sq->cur_time = 0; sq->max_size.visible = mq->max_size.visible; sq->is_eos = FALSE; sq->inextra = FALSE; sq->nextid = 0; sq->oldid = 0; gst_data_queue_set_flushing (sq->queue, FALSE); GST_LOG_OBJECT (mq, "SingleQueue %d : starting task", sq->id); result = gst_pad_start_task (sq->srcpad, (GstTaskFunction) gst_multi_queue_loop, sq->srcpad); } return result; } /* calculate the diff between running time on the sink and src of the queue. * This is the total amount of time in the queue. * WITH LOCK TAKEN */ static void update_time_level (GstMultiQueue * mq, GstSingleQueue * sq) { gint64 sink_time, src_time; sink_time = gst_segment_to_running_time (&sq->sink_segment, GST_FORMAT_TIME, sq->sink_segment.last_stop); if (sink_time == GST_CLOCK_TIME_NONE) goto beach; src_time = gst_segment_to_running_time (&sq->src_segment, GST_FORMAT_TIME, sq->src_segment.last_stop); if (src_time == GST_CLOCK_TIME_NONE) goto beach; GST_DEBUG_OBJECT (mq, "queue %d, sink %" GST_TIME_FORMAT ", src %" GST_TIME_FORMAT, sq->id, GST_TIME_ARGS (sink_time), GST_TIME_ARGS (src_time)); /* This allows for streams with out of order timestamping - sometimes the * emerging timestamp is later than the arriving one(s) */ if (sink_time < src_time) goto beach; sq->cur_time = sink_time - src_time; return; beach: sq->cur_time = 0; } /* take a NEWSEGMENT event and apply the values to segment, updating the time * level of queue. */ static void apply_segment (GstMultiQueue * mq, GstSingleQueue * sq, GstEvent * event, GstSegment * segment) { 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); /* now configure the values, we use these to track timestamps on the * sinkpad. */ if (format != GST_FORMAT_TIME) { /* non-time format, pretent the current time segment is closed with a * 0 start and unknown stop time. */ update = FALSE; format = GST_FORMAT_TIME; start = 0; stop = -1; time = 0; } GST_MULTI_QUEUE_MUTEX_LOCK (mq); gst_segment_set_newsegment_full (segment, update, rate, arate, format, start, stop, time); GST_DEBUG_OBJECT (mq, "queue %d, configured NEWSEGMENT %" GST_SEGMENT_FORMAT, sq->id, segment); /* segment can update the time level of the queue */ update_time_level (mq, sq); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); } /* take a buffer and update segment, updating the time level of the queue. */ static void apply_buffer (GstMultiQueue * mq, GstSingleQueue * sq, GstClockTime timestamp, GstClockTime duration, GstSegment * segment) { GST_MULTI_QUEUE_MUTEX_LOCK (mq); /* if no timestamp is set, assume it's continuous with the previous * time */ if (timestamp == GST_CLOCK_TIME_NONE) timestamp = segment->last_stop; /* add duration */ if (duration != GST_CLOCK_TIME_NONE) timestamp += duration; GST_DEBUG_OBJECT (mq, "queue %d, last_stop updated to %" GST_TIME_FORMAT, sq->id, GST_TIME_ARGS (timestamp)); gst_segment_set_last_stop (segment, GST_FORMAT_TIME, timestamp); /* calc diff with other end */ update_time_level (mq, sq); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); } static GstFlowReturn gst_single_queue_push_one (GstMultiQueue * mq, GstSingleQueue * sq, GstMiniObject * object) { GstFlowReturn result = GST_FLOW_OK; if (GST_IS_BUFFER (object)) { GstBuffer *buffer; GstClockTime timestamp, duration; GstCaps *caps; buffer = GST_BUFFER_CAST (object); timestamp = GST_BUFFER_TIMESTAMP (buffer); duration = GST_BUFFER_DURATION (buffer); caps = GST_BUFFER_CAPS (buffer); apply_buffer (mq, sq, timestamp, duration, &sq->src_segment); /* Applying the buffer may have made the queue non-full again, unblock it if needed */ gst_data_queue_limits_changed (sq->queue); GST_DEBUG_OBJECT (mq, "SingleQueue %d : Pushing buffer %p with ts %" GST_TIME_FORMAT, sq->id, buffer, GST_TIME_ARGS (timestamp)); /* Set caps on pad before pushing, this avoids core calling the accpetcaps * function on the srcpad, which will call acceptcaps upstream, which might * not accept these caps (anymore). */ if (caps && caps != GST_PAD_CAPS (sq->srcpad)) gst_pad_set_caps (sq->srcpad, caps); result = gst_pad_push (sq->srcpad, buffer); } else if (GST_IS_EVENT (object)) { GstEvent *event; event = GST_EVENT_CAST (object); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: result = GST_FLOW_UNEXPECTED; break; case GST_EVENT_NEWSEGMENT: apply_segment (mq, sq, event, &sq->src_segment); /* Applying the segment may have made the queue non-full again, unblock it if needed */ gst_data_queue_limits_changed (sq->queue); break; default: break; } GST_DEBUG_OBJECT (mq, "SingleQueue %d : Pushing event %p of type %s", sq->id, event, GST_EVENT_TYPE_NAME (event)); gst_pad_push_event (sq->srcpad, event); } else { g_warning ("Unexpected object in singlequeue %d (refcounting problem?)", sq->id); } return result; /* ERRORS */ } static GstMiniObject * gst_multi_queue_item_steal_object (GstMultiQueueItem * item) { GstMiniObject *res; res = item->object; item->object = NULL; return res; } static void gst_multi_queue_item_destroy (GstMultiQueueItem * item) { if (item->object) gst_mini_object_unref (item->object); g_slice_free (GstMultiQueueItem, item); } /* takes ownership of passed mini object! */ static GstMultiQueueItem * gst_multi_queue_item_new (GstMiniObject * object, guint32 curid) { GstMultiQueueItem *item; item = g_slice_new (GstMultiQueueItem); item->object = object; item->destroy = (GDestroyNotify) gst_multi_queue_item_destroy; item->posid = curid; if (GST_IS_BUFFER (object)) { item->size = GST_BUFFER_SIZE (object); item->duration = GST_BUFFER_DURATION (object); if (item->duration == GST_CLOCK_TIME_NONE) item->duration = 0; item->visible = TRUE; } else { item->size = 0; item->duration = 0; item->visible = FALSE; } return item; } /* Each main loop attempts to push buffers until the return value * is not-linked. not-linked pads are not allowed to push data beyond * any linked pads, so they don't 'rush ahead of the pack'. */ static void gst_multi_queue_loop (GstPad * pad) { GstSingleQueue *sq; GstMultiQueueItem *item; GstDataQueueItem *sitem; GstMultiQueue *mq; GstMiniObject *object; guint32 newid; guint32 oldid = G_MAXUINT32; GstFlowReturn result; sq = (GstSingleQueue *) gst_pad_get_element_private (pad); mq = sq->mqueue; do { GST_DEBUG_OBJECT (mq, "SingleQueue %d : trying to pop an object", sq->id); /* Get something from the queue, blocking until that happens, or we get * flushed */ if (!(gst_data_queue_pop (sq->queue, &sitem))) goto out_flushing; item = (GstMultiQueueItem *) sitem; newid = item->posid; /* steal the object and destroy the item */ object = gst_multi_queue_item_steal_object (item); gst_multi_queue_item_destroy (item); GST_LOG_OBJECT (mq, "SingleQueue %d : newid:%d , oldid:%d", sq->id, newid, oldid); /* If we're not-linked, we do some extra work because we might need to * wait before pushing. If we're linked but there's a gap in the IDs, * or it's the first loop, or we just passed the previous highid, * we might need to wake some sleeping pad up, so there's extra work * there too */ if (sq->srcresult == GST_FLOW_NOT_LINKED || (oldid == G_MAXUINT32) || (newid != (oldid + 1)) || oldid > mq->highid) { GST_LOG_OBJECT (mq, "CHECKING sq->srcresult: %s", gst_flow_get_name (sq->srcresult)); GST_MULTI_QUEUE_MUTEX_LOCK (mq); /* Update the nextid so other threads know when to wake us up */ sq->nextid = newid; /* Update the oldid (the last ID we output) for highid tracking */ if (oldid != G_MAXUINT32) sq->oldid = oldid; if (sq->srcresult == GST_FLOW_NOT_LINKED) { /* Go to sleep until it's time to push this buffer */ /* Recompute the highid */ compute_high_id (mq); while (newid > mq->highid && sq->srcresult == GST_FLOW_NOT_LINKED) { GST_DEBUG_OBJECT (mq, "queue %d sleeping for not-linked wakeup with " "newid %u and highid %u", sq->id, newid, mq->highid); /* Wake up all non-linked pads before we sleep */ wake_up_next_non_linked (mq); mq->numwaiting++; g_cond_wait (sq->turn, mq->qlock); mq->numwaiting--; GST_DEBUG_OBJECT (mq, "queue %d woken from sleeping for not-linked " "wakeup with newid %u and highid %u", sq->id, newid, mq->highid); } /* Re-compute the high_id in case someone else pushed */ compute_high_id (mq); } else { compute_high_id (mq); /* Wake up all non-linked pads */ wake_up_next_non_linked (mq); } /* We're done waiting, we can clear the nextid */ sq->nextid = 0; GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); } GST_LOG_OBJECT (mq, "BEFORE PUSHING sq->srcresult: %s", gst_flow_get_name (sq->srcresult)); /* Try to push out the new object */ result = gst_single_queue_push_one (mq, sq, object); sq->srcresult = result; if (result != GST_FLOW_OK && result != GST_FLOW_NOT_LINKED) goto out_flushing; GST_LOG_OBJECT (mq, "AFTER PUSHING sq->srcresult: %s", gst_flow_get_name (sq->srcresult)); oldid = newid; } while (TRUE); out_flushing: { /* Need to make sure wake up any sleeping pads when we exit */ GST_MULTI_QUEUE_MUTEX_LOCK (mq); compute_high_id (mq); wake_up_next_non_linked (mq); GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); gst_data_queue_set_flushing (sq->queue, TRUE); gst_pad_pause_task (sq->srcpad); GST_CAT_LOG_OBJECT (multi_queue_debug, mq, "SingleQueue[%d] task paused, reason:%s", sq->id, gst_flow_get_name (sq->srcresult)); return; } } /** * gst_multi_queue_chain: * * This is similar to GstQueue's chain function, except: * _ we don't have leak behavioures, * _ we push with a unique id (curid) */ static GstFlowReturn gst_multi_queue_chain (GstPad * pad, GstBuffer * buffer) { GstSingleQueue *sq; GstMultiQueue *mq; GstMultiQueueItem *item; GstFlowReturn ret = GST_FLOW_OK; guint32 curid; GstClockTime timestamp, duration; sq = gst_pad_get_element_private (pad); mq = (GstMultiQueue *) gst_pad_get_parent (pad); /* Get a unique incrementing id */ GST_MULTI_QUEUE_MUTEX_LOCK (mq); curid = mq->counter++; GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); GST_LOG_OBJECT (mq, "SingleQueue %d : about to enqueue buffer %p with id %d", sq->id, buffer, curid); item = gst_multi_queue_item_new (GST_MINI_OBJECT_CAST (buffer), curid); timestamp = GST_BUFFER_TIMESTAMP (buffer); duration = GST_BUFFER_DURATION (buffer); if (!(gst_data_queue_push (sq->queue, (GstDataQueueItem *) item))) goto flushing; /* update time level, we must do this after pushing the data in the queue so * that we never end up filling the queue first. */ apply_buffer (mq, sq, timestamp, duration, &sq->sink_segment); done: gst_object_unref (mq); return ret; /* ERRORS */ flushing: { ret = sq->srcresult; GST_LOG_OBJECT (mq, "SingleQueue %d : exit because task paused, reason: %s", sq->id, gst_flow_get_name (ret)); gst_multi_queue_item_destroy (item); goto done; } } static gboolean gst_multi_queue_sink_activate_push (GstPad * pad, gboolean active) { GstSingleQueue *sq; sq = (GstSingleQueue *) gst_pad_get_element_private (pad); if (active) { /* All pads start off linked until they push one buffer */ sq->srcresult = GST_FLOW_OK; } else { sq->srcresult = GST_FLOW_WRONG_STATE; gst_data_queue_flush (sq->queue); } return TRUE; } static gboolean gst_multi_queue_sink_event (GstPad * pad, GstEvent * event) { GstSingleQueue *sq; GstMultiQueue *mq; guint32 curid; GstMultiQueueItem *item; gboolean res; GstEventType type; GstEvent *sref = NULL; sq = (GstSingleQueue *) gst_pad_get_element_private (pad); mq = (GstMultiQueue *) gst_pad_get_parent (pad); type = GST_EVENT_TYPE (event); switch (type) { case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (mq, "SingleQueue %d : received flush start event", sq->id); res = gst_pad_push_event (sq->srcpad, event); gst_single_queue_flush (mq, sq, TRUE); goto done; case GST_EVENT_FLUSH_STOP: GST_DEBUG_OBJECT (mq, "SingleQueue %d : received flush stop event", sq->id); res = gst_pad_push_event (sq->srcpad, event); gst_single_queue_flush (mq, sq, FALSE); goto done; case GST_EVENT_NEWSEGMENT: /* take ref because the queue will take ownership and we need the event * afterwards to update the segment */ sref = gst_event_ref (event); break; default: if (!(GST_EVENT_IS_SERIALIZED (event))) { res = gst_pad_push_event (sq->srcpad, event); goto done; } break; } /* Get an unique incrementing id */ GST_MULTI_QUEUE_MUTEX_LOCK (mq); curid = mq->counter++; GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); item = gst_multi_queue_item_new ((GstMiniObject *) event, curid); GST_DEBUG_OBJECT (mq, "SingleQueue %d : Enqueuing event %p of type %s with id %d", sq->id, event, GST_EVENT_TYPE_NAME (event), curid); if (!(res = gst_data_queue_push (sq->queue, (GstDataQueueItem *) item))) goto flushing; /* mark EOS when we received one, we must do that after putting the * buffer in the queue because EOS marks the buffer as filled. No need to take * a lock, the _check_full happens from this thread only, right before pushing * into dataqueue. */ switch (type) { case GST_EVENT_EOS: sq->is_eos = TRUE; single_queue_overrun_cb (sq->queue, sq); break; case GST_EVENT_NEWSEGMENT: apply_segment (mq, sq, sref, &sq->sink_segment); gst_event_unref (sref); break; default: break; } done: gst_object_unref (mq); return res; flushing: { GST_LOG_OBJECT (mq, "SingleQueue %d : exit because task paused, reason: %s", sq->id, gst_flow_get_name (sq->srcresult)); if (sref) gst_event_unref (sref); gst_multi_queue_item_destroy (item); goto done; } } static GstCaps * gst_multi_queue_getcaps (GstPad * pad) { GstSingleQueue *sq = gst_pad_get_element_private (pad); GstPad *otherpad; GstCaps *result; otherpad = (pad == sq->srcpad) ? sq->sinkpad : sq->srcpad; GST_LOG_OBJECT (otherpad, "Getting caps from the peer of this pad"); result = gst_pad_peer_get_caps (otherpad); if (result == NULL) result = gst_caps_new_any (); return result; } static GstFlowReturn gst_multi_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf) { GstSingleQueue *sq = gst_pad_get_element_private (pad); return gst_pad_alloc_buffer (sq->srcpad, offset, size, caps, buf); } static gboolean gst_multi_queue_src_activate_push (GstPad * pad, gboolean active) { GstMultiQueue *mq; GstSingleQueue *sq; gboolean result = FALSE; sq = (GstSingleQueue *) gst_pad_get_element_private (pad); mq = sq->mqueue; GST_DEBUG_OBJECT (mq, "SingleQueue %d", sq->id); if (active) { result = gst_single_queue_flush (mq, sq, FALSE); } else { result = gst_single_queue_flush (mq, sq, TRUE); /* make sure streaming finishes */ result |= gst_pad_stop_task (pad); } return result; } static gboolean gst_multi_queue_src_event (GstPad * pad, GstEvent * event) { GstSingleQueue *sq = gst_pad_get_element_private (pad); return gst_pad_push_event (sq->sinkpad, event); } static gboolean gst_multi_queue_src_query (GstPad * pad, GstQuery * query) { GstSingleQueue *sq = gst_pad_get_element_private (pad); GstPad *peerpad; gboolean res; /* FIXME, Handle position offset depending on queue size */ /* default handling */ if (!(peerpad = gst_pad_get_peer (sq->sinkpad))) goto no_peer; res = gst_pad_query (peerpad, query); gst_object_unref (peerpad); return res; /* ERRORS */ no_peer: { GST_LOG_OBJECT (sq->sinkpad, "Couldn't send query because we have no peer"); return FALSE; } } /* * Next-non-linked functions */ /* WITH LOCK TAKEN */ static void wake_up_next_non_linked (GstMultiQueue * mq) { GList *tmp; /* maybe no-one is waiting */ if (mq->numwaiting < 1) return; /* Else figure out which singlequeue(s) need waking up */ for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) { GstSingleQueue *sq = (GstSingleQueue *) tmp->data; if (sq->srcresult == GST_FLOW_NOT_LINKED) { if (sq->nextid != 0 && sq->nextid <= mq->highid) { GST_LOG_OBJECT (mq, "Waking up singlequeue %d", sq->id); g_cond_signal (sq->turn); } } } } /* WITH LOCK TAKEN */ static void compute_high_id (GstMultiQueue * mq) { /* The high-id is either the highest id among the linked pads, or if all * pads are not-linked, it's the lowest not-linked pad */ GList *tmp; guint32 lowest = G_MAXUINT32; guint32 highid = G_MAXUINT32; for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) { GstSingleQueue *sq = (GstSingleQueue *) tmp->data; GST_LOG_OBJECT (mq, "inspecting sq:%d , nextid:%d, oldid:%d, srcresult:%s", sq->id, sq->nextid, sq->oldid, gst_flow_get_name (sq->srcresult)); if (sq->srcresult == GST_FLOW_NOT_LINKED) { /* No need to consider queues which are not waiting */ if (sq->nextid == 0) { GST_LOG_OBJECT (mq, "sq:%d is not waiting - ignoring", sq->id); continue; } if (sq->nextid < lowest) lowest = sq->nextid; } else if (sq->srcresult != GST_FLOW_UNEXPECTED) { /* If we don't have a global highid, or the global highid is lower than * this single queue's last outputted id, store the queue's one, * unless the singlequeue is at EOS (srcresult = UNEXPECTED) */ if ((highid == G_MAXUINT32) || (sq->oldid > highid)) highid = sq->oldid; } } if (highid == G_MAXUINT32 || lowest < highid) mq->highid = lowest; else mq->highid = highid; GST_LOG_OBJECT (mq, "Highid is now : %u, lowest non-linked %u", mq->highid, lowest); } #define IS_FILLED(format, value) ((sq->max_size.format) != 0 && \ (sq->max_size.format) <= (value)) /* * GstSingleQueue functions */ static void single_queue_overrun_cb (GstDataQueue * dq, GstSingleQueue * sq) { GstMultiQueue *mq = sq->mqueue; GList *tmp; GstDataQueueSize size; gboolean filled = FALSE; gst_data_queue_get_level (sq->queue, &size); GST_LOG_OBJECT (mq, "Single Queue %d is full", sq->id); GST_MULTI_QUEUE_MUTEX_LOCK (mq); for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) { GstSingleQueue *ssq = (GstSingleQueue *) tmp->data; GstDataQueueSize ssize; GST_LOG_OBJECT (mq, "Checking Queue %d", ssq->id); if (gst_data_queue_is_empty (ssq->queue)) { GST_LOG_OBJECT (mq, "Queue %d is empty", ssq->id); if (IS_FILLED (visible, size.visible)) { sq->max_size.visible = size.visible + 1; GST_DEBUG_OBJECT (mq, "Another queue is empty, bumping single queue %d max visible to %d", sq->id, sq->max_size.visible); } GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); goto beach; } /* check if we reached the hard time/bytes limits */ gst_data_queue_get_level (ssq->queue, &ssize); GST_DEBUG_OBJECT (mq, "queue %d: visible %u/%u, bytes %u/%u, time %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT, ssq->id, ssize.visible, sq->max_size.visible, ssize.bytes, sq->max_size.bytes, sq->cur_time, sq->max_size.time); /* if this queue is filled completely we must signal overrun */ if (sq->is_eos || IS_FILLED (bytes, ssize.bytes) || IS_FILLED (time, sq->cur_time)) { GST_LOG_OBJECT (mq, "Queue %d is filled", ssq->id); filled = TRUE; } } /* no queues were empty */ GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); /* Overrun is always forwarded, since this is blocking the upstream element */ if (filled) { GST_DEBUG_OBJECT (mq, "A queue is filled, signalling overrun"); g_signal_emit (G_OBJECT (mq), gst_multi_queue_signals[SIGNAL_OVERRUN], 0); } beach: return; } static void single_queue_underrun_cb (GstDataQueue * dq, GstSingleQueue * sq) { gboolean empty = TRUE; GstMultiQueue *mq = sq->mqueue; GList *tmp; GST_LOG_OBJECT (mq, "Single Queue %d is empty, Checking other single queues", sq->id); GST_MULTI_QUEUE_MUTEX_LOCK (mq); for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) { GstSingleQueue *sq = (GstSingleQueue *) tmp->data; if (gst_data_queue_is_full (sq->queue)) { GstDataQueueSize size; gst_data_queue_get_level (sq->queue, &size); if (IS_FILLED (visible, size.visible)) { sq->max_size.visible = size.visible + 1; GST_DEBUG_OBJECT (mq, "queue %d is filled, bumping its max visible to %d", sq->id, sq->max_size.visible); gst_data_queue_limits_changed (sq->queue); } } if (!gst_data_queue_is_empty (sq->queue)) empty = FALSE; } GST_MULTI_QUEUE_MUTEX_UNLOCK (mq); if (empty) { GST_DEBUG_OBJECT (mq, "All queues are empty, signalling it"); g_signal_emit (G_OBJECT (mq), gst_multi_queue_signals[SIGNAL_UNDERRUN], 0); } } static gboolean single_queue_check_full (GstDataQueue * dataq, guint visible, guint bytes, guint64 time, GstSingleQueue * sq) { gboolean res; GST_DEBUG ("queue %d: visible %u/%u, bytes %u/%u, time %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT, sq->id, visible, sq->max_size.visible, bytes, sq->max_size.bytes, sq->cur_time, sq->max_size.time); /* we are always filled on EOS */ if (sq->is_eos) return TRUE; /* we never go past the max visible items */ if (IS_FILLED (visible, visible)) return TRUE; /* check time or bytes */ res = IS_FILLED (time, sq->cur_time) || IS_FILLED (bytes, bytes); return res; } static void gst_single_queue_free (GstSingleQueue * sq) { /* DRAIN QUEUE */ gst_data_queue_flush (sq->queue); g_object_unref (sq->queue); g_cond_free (sq->turn); g_free (sq); } static GstSingleQueue * gst_single_queue_new (GstMultiQueue * mqueue) { GstSingleQueue *sq; gchar *tmp; sq = g_new0 (GstSingleQueue, 1); GST_MULTI_QUEUE_MUTEX_LOCK (mqueue); sq->id = mqueue->nbqueues++; /* copy over max_size and extra_size so we don't need to take the lock * any longer when checking if the queue is full. */ sq->max_size.visible = mqueue->max_size.visible; sq->max_size.bytes = mqueue->max_size.bytes; sq->max_size.time = mqueue->max_size.time; sq->extra_size.visible = mqueue->extra_size.visible; sq->extra_size.bytes = mqueue->extra_size.bytes; sq->extra_size.time = mqueue->extra_size.time; GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue); GST_DEBUG_OBJECT (mqueue, "Creating GstSingleQueue id:%d", sq->id); sq->mqueue = mqueue; sq->srcresult = GST_FLOW_WRONG_STATE; sq->queue = gst_data_queue_new ((GstDataQueueCheckFullFunction) single_queue_check_full, sq); sq->is_eos = FALSE; gst_segment_init (&sq->sink_segment, GST_FORMAT_TIME); gst_segment_init (&sq->src_segment, GST_FORMAT_TIME); sq->nextid = 0; sq->oldid = 0; sq->turn = g_cond_new (); /* attach to underrun/overrun signals to handle non-starvation */ g_signal_connect (G_OBJECT (sq->queue), "full", G_CALLBACK (single_queue_overrun_cb), sq); g_signal_connect (G_OBJECT (sq->queue), "empty", G_CALLBACK (single_queue_underrun_cb), sq); tmp = g_strdup_printf ("sink%d", sq->id); sq->sinkpad = gst_pad_new_from_static_template (&sinktemplate, tmp); g_free (tmp); gst_pad_set_chain_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_chain)); gst_pad_set_activatepush_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_sink_activate_push)); gst_pad_set_event_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_sink_event)); gst_pad_set_getcaps_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_getcaps)); gst_pad_set_bufferalloc_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_bufferalloc)); gst_pad_set_internal_link_function (sq->sinkpad, GST_DEBUG_FUNCPTR (gst_multi_queue_get_internal_links)); tmp = g_strdup_printf ("src%d", sq->id); sq->srcpad = gst_pad_new_from_static_template (&srctemplate, tmp); g_free (tmp); gst_pad_set_activatepush_function (sq->srcpad, GST_DEBUG_FUNCPTR (gst_multi_queue_src_activate_push)); gst_pad_set_getcaps_function (sq->srcpad, GST_DEBUG_FUNCPTR (gst_multi_queue_getcaps)); gst_pad_set_event_function (sq->srcpad, GST_DEBUG_FUNCPTR (gst_multi_queue_src_event)); gst_pad_set_query_function (sq->srcpad, GST_DEBUG_FUNCPTR (gst_multi_queue_src_query)); gst_pad_set_internal_link_function (sq->srcpad, GST_DEBUG_FUNCPTR (gst_multi_queue_get_internal_links)); gst_pad_set_element_private (sq->sinkpad, (gpointer) sq); gst_pad_set_element_private (sq->srcpad, (gpointer) sq); /* only activate the pads when we are not in the NULL state * and add the pad under the state_lock to prevend state changes * between activating and adding */ g_static_rec_mutex_lock (GST_STATE_GET_LOCK (mqueue)); if (GST_STATE_TARGET (mqueue) != GST_STATE_NULL) { gst_pad_set_active (sq->srcpad, TRUE); gst_pad_set_active (sq->sinkpad, TRUE); } gst_element_add_pad (GST_ELEMENT (mqueue), sq->srcpad); gst_element_add_pad (GST_ELEMENT (mqueue), sq->sinkpad); g_static_rec_mutex_unlock (GST_STATE_GET_LOCK (mqueue)); GST_DEBUG_OBJECT (mqueue, "GstSingleQueue [%d] created and pads added", sq->id); return sq; }