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gstreamer/plugins/elements/gstmultiqueue.c
Jan Schmidt 60f4a78b3d plugins/elements/gstmultiqueue.c: Don't deadlock when releasing a pad - gst_pad_set_active may try and take the multi... 
Original commit message from CVS:
* plugins/elements/gstmultiqueue.c: (gst_multi_queue_release_pad):
Don't deadlock when releasing a pad - gst_pad_set_active may try
and take the multiqueue lock too.
2007-04-13 11:20:48 +00:00

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/* GStreamer
* Copyright (C) 2006 Edward Hervey <edward@fluendo.com>
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#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;
/* queue of data */
GstDataQueue *queue;
GstDataQueueSize max_size, extra_size;
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_next_non_linked (GstMultiQueue * mq);
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)
static const GstElementDetails gst_multi_queue_details =
GST_ELEMENT_DETAILS ("MultiQueue",
"Generic",
"Multiple data queue",
"Edward Hervey <edward@fluendo.com>");
#define DEFAULT_MAX_SIZE_BYTES 10 * 1024 * 1024 /* 10 MB */
#define DEFAULT_MAX_SIZE_BUFFERS 200
#define DEFAULT_MAX_SIZE_TIME GST_SECOND
#define DEFAULT_EXTRA_SIZE_BYTES 10 * 1024 * 1024 /* 10 MB */
#define DEFAULT_EXTRA_SIZE_BUFFERS 200
#define DEFAULT_EXTRA_SIZE_TIME 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 { \
GST_CAT_LOG_OBJECT (multi_queue_debug, q, \
"locking qlock from thread %p", \
g_thread_self ()); \
g_mutex_lock (q->qlock); \
GST_CAT_LOG_OBJECT (multi_queue_debug, q, \
"locked qlock from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define GST_MULTI_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
GST_CAT_LOG_OBJECT (multi_queue_debug, q, \
"unlocking qlock from thread %p", \
g_thread_self ()); \
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);
#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_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));
gst_element_class_set_details (gstelement_class, &gst_multi_queue_details);
}
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 */
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);
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_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_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_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_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_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));
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 = 0;
mqueue->highid = -1;
mqueue->nextnotlinked = -1;
mqueue->qlock = g_mutex_new ();
/* FILLME ? */
}
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);
if (G_OBJECT_CLASS (parent_class)->finalize)
G_OBJECT_CLASS (parent_class)->finalize (object);
}
#define SET_CHILD_PROPERTY(mq,name,value) G_STMT_START { \
GList * tmp = mq->queues; \
while (tmp) { \
GstSingleQueue *q = (GstSingleQueue*)tmp->data; \
g_object_set_property ((GObject*) q->queue, name, value); \
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:
mq->max_size.bytes = g_value_get_uint (value);
SET_CHILD_PROPERTY (mq, "max-size-bytes", value);
break;
case ARG_MAX_SIZE_BUFFERS:
mq->max_size.visible = g_value_get_uint (value);
SET_CHILD_PROPERTY (mq, "max-size-visible", value);
break;
case ARG_MAX_SIZE_TIME:
mq->max_size.time = g_value_get_uint64 (value);
SET_CHILD_PROPERTY (mq, "max-size-time", value);
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);
}
/*
* 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", 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_push_one (GstMultiQueue * mq, GstSingleQueue * sq,
GstMiniObject * object)
{
if (GST_IS_BUFFER (object)) {
sq->srcresult = gst_pad_push (sq->srcpad, GST_BUFFER (object));
if ((sq->srcresult != GST_FLOW_OK)
&& (sq->srcresult != GST_FLOW_NOT_LINKED)) {
GST_DEBUG_OBJECT (mq, "GstSingleQueue %d : pausing queue, reason %s",
sq->id, gst_flow_get_name (sq->srcresult));
gst_data_queue_set_flushing (sq->queue, TRUE);
gst_pad_pause_task (sq->srcpad);
}
} else if (GST_IS_EVENT (object)) {
if (GST_EVENT_TYPE (object) == GST_EVENT_EOS) {
sq->srcresult = GST_FLOW_UNEXPECTED;
GST_DEBUG_OBJECT (mq, "GstSingleQueue %d : pausing queue, got EOS",
sq->id);
gst_data_queue_set_flushing (sq->queue, TRUE);
gst_pad_pause_task (sq->srcpad);
}
gst_pad_push_event (sq->srcpad, GST_EVENT (object));
} else {
g_warning ("Unexpected object in singlequeue %d (refcounting problem?)",
sq->id);
}
return FALSE;
}
static void
gst_multi_queue_item_destroy (GstMultiQueueItem * item)
{
gst_mini_object_unref (item->object);
g_free (item);
}
static GstMultiQueueItem *
gst_multi_queue_item_new (GstMiniObject * object)
{
GstMultiQueueItem *item;
item = g_new0 (GstMultiQueueItem, 1);
item->object = gst_mini_object_ref (object);
item->destroy = (GDestroyNotify) gst_multi_queue_item_destroy;
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;
}
return item;
}
static void
gst_multi_queue_loop (GstPad * pad)
{
GstSingleQueue *sq;
GstMultiQueueItem *item;
GstDataQueueItem *sitem;
GstMultiQueue *mq;
GstMiniObject *object;
guint32 newid;
guint32 oldid = -1;
sq = (GstSingleQueue *) gst_pad_get_element_private (pad);
mq = sq->mqueue;
restart:
GST_DEBUG_OBJECT (mq, "SingleQueue %d : trying to pop an object", sq->id);
if (!(gst_data_queue_pop (sq->queue, &sitem))) {
/* QUEUE FLUSHING */
if (sq->srcresult != GST_FLOW_OK)
goto out_flushing;
else
GST_WARNING_OBJECT (mq,
"data_queue_pop() returned FALSE, but srcresult == GST_FLOW_OK !");
} else {
item = (GstMultiQueueItem *) sitem;
newid = item->posid;
object = item->object;
GST_LOG_OBJECT (mq, "SingleQueue %d : newid:%d , oldid:%d",
sq->id, newid, oldid);
/* 1. Only check turn if :
* _ We haven't pushed anything yet
* _ OR the new id isn't the follower of the previous one (continuous segment) */
if ((oldid == -1) || (newid != (oldid + 1))) {
GST_MULTI_QUEUE_MUTEX_LOCK (mq);
GST_LOG_OBJECT (mq, "CHECKING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
/* preamble : if we're not linked, set the newid as the next one we want */
if (sq->srcresult == GST_FLOW_NOT_LINKED)
sq->nextid = newid;
/* store the last id we outputted */
if (oldid != -1)
sq->oldid = oldid;
/* 2. If there's a queue waiting to push, wake it up. If it's us the */
/* check below (3.) will avoid us waiting. */
wake_up_next_non_linked (mq);
/* 3. If we're not linked AND our nextid is higher than the highest oldid outputted
* _ Update global next-not-linked
* _ Wait on our conditional
*/
while ((sq->srcresult == GST_FLOW_NOT_LINKED)
&& (mq->nextnotlinked != sq->id)) {
compute_next_non_linked (mq);
g_cond_wait (sq->turn, mq->qlock);
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
/* 4. Check again status, maybe we're flushing */
if ((sq->srcresult != GST_FLOW_OK)
&& (sq->srcresult != GST_FLOW_NOT_LINKED)) {
gst_multi_queue_item_destroy (item);
goto out_flushing;
}
}
GST_LOG_OBJECT (mq, "BEFORE PUSHING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
/* 4. Try to push out the new object */
gst_single_queue_push_one (mq, sq, object);
GST_LOG_OBJECT (mq, "AFTER PUSHING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
gst_multi_queue_item_destroy (item);
oldid = newid;
/* 5. if GstFlowReturn is non-fatal, goto restart */
if ((sq->srcresult == GST_FLOW_OK)
|| (sq->srcresult == GST_FLOW_NOT_LINKED))
goto restart;
}
beach:
return;
out_flushing:
{
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));
goto beach;
}
}
/**
* 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;
sq = gst_pad_get_element_private (pad);
mq = (GstMultiQueue *) gst_pad_get_parent (pad);
/* Get an 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 push buffer with id %d",
sq->id, curid);
item = gst_multi_queue_item_new ((GstMiniObject *) buffer);
item->posid = curid;
if (!(gst_data_queue_push (sq->queue, (GstDataQueueItem *) item))) {
GST_LOG_OBJECT (mq, "SingleQueue %d : exit because task paused, reason: %s",
sq->id, gst_flow_get_name (sq->srcresult));
gst_multi_queue_item_destroy (item);
gst_buffer_unref (buffer);
ret = sq->srcresult;
}
gst_object_unref (mq);
return ret;
}
static gboolean
gst_multi_queue_sink_activate_push (GstPad * pad, gboolean active)
{
GstSingleQueue *sq;
sq = (GstSingleQueue *) gst_pad_get_element_private (pad);
if (active)
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;
sq = (GstSingleQueue *) gst_pad_get_element_private (pad);
mq = (GstMultiQueue *) gst_pad_get_parent (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (mq, "SingleQueue %d : received flush start event",
sq->id);
gst_pad_push_event (sq->srcpad, event);
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_pad_pause_task (sq->srcpad);
goto done;
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (mq, "SingleQueue %d : received flush stop event",
sq->id);
gst_pad_push_event (sq->srcpad, event);
gst_data_queue_flush (sq->queue);
gst_data_queue_set_flushing (sq->queue, FALSE);
sq->srcresult = GST_FLOW_OK;
sq->nextid = -1;
sq->oldid = -1;
GST_DEBUG_OBJECT (mq, "SingleQueue %d : restarting task", sq->id);
gst_pad_start_task (sq->srcpad, (GstTaskFunction) gst_multi_queue_loop,
sq->srcpad);
goto done;
default:
if (!(GST_EVENT_IS_SERIALIZED (event))) {
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);
item->posid = curid;
GST_DEBUG_OBJECT (mq,
"SingleQueue %d : Adding event %p of type %s with id %d", sq->id, event,
GST_EVENT_TYPE_NAME (event), curid);
if (!(gst_data_queue_push (sq->queue, (GstDataQueueItem *) item))) {
GST_LOG_OBJECT (mq, "SingleQueue %d : exit because task paused, reason: %s",
sq->id, gst_flow_get_name (sq->srcresult));
gst_multi_queue_item_destroy (item);
gst_event_unref (event);
}
done:
gst_object_unref (mq);
return TRUE;
}
static GstCaps *
gst_multi_queue_getcaps (GstPad * pad)
{
GstSingleQueue *sq = gst_pad_get_element_private (pad);
GstPad *otherpad;
GstCaps *result;
GST_LOG_OBJECT (pad, "...");
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_LOG ("SingleQueue %d", sq->id);
if (active) {
sq->srcresult = GST_FLOW_OK;
gst_data_queue_set_flushing (sq->queue, FALSE);
result = gst_pad_start_task (pad, (GstTaskFunction) gst_multi_queue_loop,
pad);
} else {
/* 1. unblock loop function */
sq->srcresult = GST_FLOW_WRONG_STATE;
gst_data_queue_set_flushing (sq->queue, TRUE);
/* 2. unblock potentially non-linked pad */
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);
/* 3. make sure streaming finishes */
result = gst_pad_stop_task (pad);
gst_data_queue_set_flushing (sq->queue, FALSE);
}
return result;
}
static gboolean
gst_multi_queue_acceptcaps (GstPad * pad, GstCaps * caps)
{
return TRUE;
}
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;
/* FILLME */
/* 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;
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;
GST_LOG ("mq->nextnotlinked:%d", mq->nextnotlinked);
/* maybe no-one is waiting */
if (mq->nextnotlinked == -1)
return;
/* Else figure out which singlequeue it is and wake it 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->id == mq->nextnotlinked) {
GST_LOG_OBJECT (mq, "Waking up singlequeue %d", sq->id);
g_cond_signal (sq->turn);
return;
}
}
}
/* WITH LOCK TAKEN */
static void
compute_next_non_linked (GstMultiQueue * mq)
{
GList *tmp;
guint32 lowest = G_MAXUINT32;
gint nextid = -1;
for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) {
GstSingleQueue *sq = (GstSingleQueue *) tmp->data;
GST_LOG ("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)
if (lowest > sq->nextid) {
lowest = sq->nextid;
nextid = sq->id;
}
/* 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 */
if ((mq->highid == -1) || (mq->highid < sq->oldid))
mq->highid = sq->oldid;
}
mq->nextnotlinked = nextid;
GST_LOG_OBJECT (mq,
"Next-non-linked is sq #%d with nextid : %d. Highid is now : %d", nextid,
lowest, mq->highid);
}
/*
* GstSingleQueue functions
*/
static void
single_queue_overrun_cb (GstDataQueue * dq, GstSingleQueue * sq)
{
GstMultiQueue *mq = sq->mqueue;
GList *tmp;
GST_LOG_OBJECT (sq->mqueue, "Single Queue %d is full", sq->id);
if (!sq->inextra) {
/* Check if at least one other queue is empty... */
GST_MULTI_QUEUE_MUTEX_LOCK (mq);
for (tmp = mq->queues; tmp; tmp = g_list_next (tmp)) {
GstSingleQueue *ssq = (GstSingleQueue *) tmp->data;
if (gst_data_queue_is_empty (ssq->queue)) {
/* ... if so set sq->inextra to TRUE and don't emit overrun signal */
GST_DEBUG_OBJECT (mq,
"Another queue is empty, bumping single queue into extra data mode");
sq->inextra = TRUE;
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
goto beach;
}
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
}
/* Overrun is always forwarded, since this is blocking the upstream element */
g_signal_emit (G_OBJECT (sq->mqueue), 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 if all single queues are empty",
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_empty (sq->queue)) {
empty = FALSE;
break;
}
}
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;
/* In all cases (extra mode or not), we check how the queue current level
* compares to max_size. */
res = (((sq->max_size.visible != 0) &&
sq->max_size.visible < visible) ||
((sq->max_size.bytes != 0) &&
sq->max_size.bytes < bytes) ||
((sq->max_size.time != 0) && sq->max_size.time < time));
if (G_UNLIKELY (sq->inextra)) {
/* If we're in extra mode, one of two things can happen to check for
* fullness: */
if (!res)
/* #1 : Either we are not full against normal max_size levels, in which
* case we can go out of extra mode. */
sq->inextra = FALSE;
else
/* #2 : Or else, the check should be done against max_size + extra_size */
res = (((sq->max_size.visible != 0) &&
(sq->max_size.visible + sq->extra_size.visible) < visible) ||
((sq->max_size.bytes != 0) &&
(sq->max_size.bytes + sq->extra_size.bytes) < bytes) ||
((sq->max_size.time != 0) &&
(sq->max_size.time + sq->extra_size.time) < time));
}
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. */
/* FIXME : We can't modify those values once the single queue is created
* since we don't have any lock protecting those values. */
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_OK;
sq->queue = gst_data_queue_new ((GstDataQueueCheckFullFunction)
single_queue_check_full, sq);
sq->nextid = -1;
sq->oldid = -1;
sq->turn = g_cond_new ();
/* FIXME : attach to underrun/overrun signals to handle non-starvation
* OR should this be handled when we check if the queue is full/empty before pushing/popping ? */
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));
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_acceptcaps_function (sq->srcpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_acceptcaps));
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_element_private (sq->sinkpad, (gpointer) sq);
gst_pad_set_element_private (sq->srcpad, (gpointer) sq);
gst_pad_set_active (sq->srcpad, TRUE);
gst_element_add_pad (GST_ELEMENT (mqueue), sq->srcpad);
gst_pad_set_active (sq->sinkpad, TRUE);
gst_element_add_pad (GST_ELEMENT (mqueue), sq->sinkpad);
GST_DEBUG_OBJECT (mqueue, "GstSingleQueue [%d] created and pads added",
sq->id);
return sq;
}
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