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gstreamer/plugins/elements/gstmultiqueue.c
Sebastian Dröge 6d97652903 multiqueue: Add another check for the flushing flag after taking the lock 
This prevents another potential deadlock when flushing the pad
at exactly the right time.
2011-04-08 09:15:56 +02:00

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/* GStreamer
* Copyright (C) 2006 Edward Hervey <edward@fluendo.com>
* Copyright (C) 2007 Jan Schmidt <jan@fluendo.com>
* Copyright (C) 2007 Wim Taymans <wim@fluendo.com>
* Copyright (C) 2011 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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
*
* <refsect2>
* <para>
* Multiqueue is similar to a normal #GstQueue with the following additional
* features:
* <orderedlist>
* <listitem>
* <itemizedlist><title>Multiple streamhandling</title>
* <listitem><para>
* The element handles queueing data on more than one stream at once. To
* achieve such a feature it has request sink pads (sink&percnt;d) and
* 'sometimes' src pads (src&percnt;d).
* </para><para>
* 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.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Non-starvation on multiple streams</title>
* <listitem><para>
* 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.
* </para><para>
* If an EOS event comes through a srcpad, the associated queue will be
* considered as 'not-empty' in the queue-size-growing algorithm.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Non-linked srcpads graceful handling</title>
* <listitem><para>
* 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.
* </para><para>
* 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.
* </para></listitem>
* </itemizedlist>
* </listitem>
* </orderedlist>
* </para>
* <para>
* 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,
* </para>
* <para>
* #GstMultiQueue:extra-size-bytes and #GstMultiQueue:extra-size-time are
* currently unused.
* </para>
* <para>
* 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.
* </para>
* <para>
* 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.
* </para>
* </refsect2>
*
* Last reviewed on 2008-01-25 (0.10.17)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst.h>
#include <stdio.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;
/* segments */
GstSegment sink_segment;
GstSegment src_segment;
/* position of src/sink */
GstClockTime sinktime, srctime;
/* TRUE if either position needs to be recalculated */
gboolean sink_tainted, src_tainted;
/* queue of data */
GstDataQueue *queue;
GstDataQueueSize max_size, extra_size;
GstClockTime cur_time;
gboolean is_eos;
gboolean flushing;
/* 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) */
guint32 last_oldid; /* Previously observed old_id, reset to MAXUINT32 on flush */
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, gint id);
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 void single_queue_underrun_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)
/* Signals and args */
enum
{
SIGNAL_UNDERRUN,
SIGNAL_OVERRUN,
LAST_SIGNAL
};
/* 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.
* Since we dynamically scale the queue buffer size up to the limits but avoid
* going above the max-size-buffers when we can, we don't really need this
* aditional extra size. */
#define DEFAULT_EXTRA_SIZE_BYTES 10 * 1024 * 1024 /* 10 MB */
#define DEFAULT_EXTRA_SIZE_BUFFERS 5
#define DEFAULT_EXTRA_SIZE_TIME 3 * GST_SECOND
#define DEFAULT_USE_BUFFERING FALSE
#define DEFAULT_LOW_PERCENT 10
#define DEFAULT_HIGH_PERCENT 99
enum
{
PROP_0,
PROP_EXTRA_SIZE_BYTES,
PROP_EXTRA_SIZE_BUFFERS,
PROP_EXTRA_SIZE_TIME,
PROP_MAX_SIZE_BYTES,
PROP_MAX_SIZE_BUFFERS,
PROP_MAX_SIZE_TIME,
PROP_USE_BUFFERING,
PROP_LOW_PERCENT,
PROP_HIGH_PERCENT,
PROP_LAST
};
#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 GstStateChangeReturn gst_multi_queue_change_state (GstElement *
element, GstStateChange transition);
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 <edward@fluendo.com>");
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_multi_queue_set_property;
gobject_class->get_property = 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, PROP_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, PROP_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, PROP_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, PROP_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)"
" (NOT IMPLEMENTED)",
0, G_MAXUINT, DEFAULT_EXTRA_SIZE_BYTES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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)"
" (NOT IMPLEMENTED)",
0, G_MAXUINT, DEFAULT_EXTRA_SIZE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_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)"
" (NOT IMPLEMENTED)",
0, G_MAXUINT64, DEFAULT_EXTRA_SIZE_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstMultiQueue:use-buffering
*
* Enable the buffering option in multiqueue so that BUFFERING messages are
* emited based on low-/high-percent thresholds.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_USE_BUFFERING,
g_param_spec_boolean ("use-buffering", "Use buffering",
"Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds",
DEFAULT_USE_BUFFERING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstMultiQueue:low-percent
*
* Low threshold percent for buffering to start.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_LOW_PERCENT,
g_param_spec_int ("low-percent", "Low percent",
"Low threshold for buffering to start", 0, 100,
DEFAULT_LOW_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstMultiQueue:high-percent
*
* High threshold percent for buffering to finish.
*
* Since: 0.10.26
*/
g_object_class_install_property (gobject_class, PROP_HIGH_PERCENT,
g_param_spec_int ("high-percent", "High percent",
"High threshold for buffering to finish", 0, 100,
DEFAULT_HIGH_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gobject_class->finalize = 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);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_multi_queue_change_state);
}
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->use_buffering = DEFAULT_USE_BUFFERING;
mqueue->low_percent = DEFAULT_LOW_PERCENT;
mqueue->high_percent = DEFAULT_HIGH_PERCENT;
mqueue->counter = 1;
mqueue->highid = -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;
mqueue->queues_cookie++;
/* 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 PROP_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 PROP_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 PROP_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 PROP_EXTRA_SIZE_BYTES:
mq->extra_size.bytes = g_value_get_uint (value);
break;
case PROP_EXTRA_SIZE_BUFFERS:
mq->extra_size.visible = g_value_get_uint (value);
break;
case PROP_EXTRA_SIZE_TIME:
mq->extra_size.time = g_value_get_uint64 (value);
break;
case PROP_USE_BUFFERING:
mq->use_buffering = g_value_get_boolean (value);
break;
case PROP_LOW_PERCENT:
mq->low_percent = g_value_get_int (value);
break;
case PROP_HIGH_PERCENT:
mq->high_percent = g_value_get_int (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 PROP_EXTRA_SIZE_BYTES:
g_value_set_uint (value, mq->extra_size.bytes);
break;
case PROP_EXTRA_SIZE_BUFFERS:
g_value_set_uint (value, mq->extra_size.visible);
break;
case PROP_EXTRA_SIZE_TIME:
g_value_set_uint64 (value, mq->extra_size.time);
break;
case PROP_MAX_SIZE_BYTES:
g_value_set_uint (value, mq->max_size.bytes);
break;
case PROP_MAX_SIZE_BUFFERS:
g_value_set_uint (value, mq->max_size.visible);
break;
case PROP_MAX_SIZE_TIME:
g_value_set_uint64 (value, mq->max_size.time);
break;
case PROP_USE_BUFFERING:
g_value_set_boolean (value, mq->use_buffering);
break;
case PROP_LOW_PERCENT:
g_value_set_int (value, mq->low_percent);
break;
case PROP_HIGH_PERCENT:
g_value_set_int (value, mq->high_percent);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
}
static GstIterator *
gst_multi_queue_iterate_internal_links (GstPad * pad)
{
GstIterator *it = NULL;
GstPad *opad;
GstSingleQueue *squeue;
GstMultiQueue *mq = GST_MULTI_QUEUE (gst_pad_get_parent (pad));
GST_MULTI_QUEUE_MUTEX_LOCK (mq);
squeue = gst_pad_get_element_private (pad);
if (!squeue)
goto out;
if (squeue->sinkpad == pad)
opad = gst_object_ref (squeue->srcpad);
else if (squeue->srcpad == pad)
opad = gst_object_ref (squeue->sinkpad);
else
goto out;
it = gst_iterator_new_single (GST_TYPE_PAD, opad,
(GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
gst_object_unref (opad);
out:
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
gst_object_unref (mq);
return it;
}
/*
* 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;
gint temp_id = -1;
if (name) {
sscanf (name + 4, "%d", &temp_id);
GST_LOG_OBJECT (element, "name : %s (id %d)", GST_STR_NULL (name), temp_id);
}
/* Create a new single queue, add the sink and source pad and return the sink pad */
squeue = gst_single_queue_new (mqueue, temp_id);
GST_DEBUG_OBJECT (mqueue, "Returning pad %s:%s",
GST_DEBUG_PAD_NAME (squeue->sinkpad));
return squeue ? squeue->sinkpad : NULL;
}
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);
mqueue->queues_cookie++;
/* 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_pad_set_element_private (sq->srcpad, NULL);
gst_pad_set_element_private (sq->sinkpad, NULL);
gst_element_remove_pad (element, sq->srcpad);
gst_element_remove_pad (element, sq->sinkpad);
gst_single_queue_free (sq);
}
static GstStateChangeReturn
gst_multi_queue_change_state (GstElement * element, GstStateChange transition)
{
GstMultiQueue *mqueue = GST_MULTI_QUEUE (element);
GstSingleQueue *sq = NULL;
GstStateChangeReturn result;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:{
GList *tmp;
/* Set all pads to non-flushing */
GST_MULTI_QUEUE_MUTEX_LOCK (mqueue);
for (tmp = mqueue->queues; tmp; tmp = g_list_next (tmp)) {
sq = (GstSingleQueue *) tmp->data;
sq->flushing = FALSE;
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue);
break;
}
case GST_STATE_CHANGE_PAUSED_TO_READY:{
GList *tmp;
/* Un-wait all waiting pads */
GST_MULTI_QUEUE_MUTEX_LOCK (mqueue);
for (tmp = mqueue->queues; tmp; tmp = g_list_next (tmp)) {
sq = (GstSingleQueue *) tmp->data;
sq->flushing = TRUE;
g_cond_signal (sq->turn);
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mqueue);
break;
}
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
default:
break;
}
return result;
}
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);
sq->flushing = 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);
sq->sink_tainted = sq->src_tainted = TRUE;
} 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->nextid = 0;
sq->oldid = 0;
sq->last_oldid = G_MAXUINT32;
gst_data_queue_set_flushing (sq->queue, FALSE);
sq->flushing = 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;
}
static void
update_buffering (GstMultiQueue * mq, GstSingleQueue * sq)
{
GstDataQueueSize size;
gint percent, tmp;
gboolean post = FALSE;
/* nothing to dowhen we are not in buffering mode */
if (!mq->use_buffering)
return;
gst_data_queue_get_level (sq->queue, &size);
GST_DEBUG_OBJECT (mq,
"queue %d: visible %u/%u, bytes %u/%u, time %" G_GUINT64_FORMAT "/%"
G_GUINT64_FORMAT, sq->id, size.visible, sq->max_size.visible,
size.bytes, sq->max_size.bytes, sq->cur_time, sq->max_size.time);
/* get bytes and time percentages and take the max */
if (sq->is_eos) {
percent = 100;
} else {
percent = 0;
if (sq->max_size.time > 0) {
tmp = (sq->cur_time * 100) / sq->max_size.time;
percent = MAX (percent, tmp);
}
if (sq->max_size.bytes > 0) {
tmp = (size.bytes * 100) / sq->max_size.bytes;
percent = MAX (percent, tmp);
}
}
if (mq->buffering) {
post = TRUE;
if (percent >= mq->high_percent) {
mq->buffering = FALSE;
}
/* make sure it increases */
percent = MAX (mq->percent, percent);
if (percent == mq->percent)
/* don't post if nothing changed */
post = FALSE;
else
/* else keep last value we posted */
mq->percent = percent;
} else {
if (percent < mq->low_percent) {
mq->buffering = TRUE;
mq->percent = percent;
post = TRUE;
}
}
if (post) {
GstMessage *message;
/* scale to high percent so that it becomes the 100% mark */
percent = percent * 100 / mq->high_percent;
/* clip */
if (percent > 100)
percent = 100;
GST_DEBUG_OBJECT (mq, "buffering %d percent", percent);
message = gst_message_new_buffering (GST_OBJECT_CAST (mq), percent);
gst_element_post_message (GST_ELEMENT_CAST (mq), message);
} else {
GST_DEBUG_OBJECT (mq, "filled %d percent", percent);
}
}
/* 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;
if (sq->sink_tainted) {
sink_time = sq->sinktime =
gst_segment_to_running_time (&sq->sink_segment, GST_FORMAT_TIME,
sq->sink_segment.last_stop);
if (G_UNLIKELY (sink_time != GST_CLOCK_TIME_NONE))
/* if we have a time, we become untainted and use the time */
sq->sink_tainted = FALSE;
} else
sink_time = sq->sinktime;
if (sq->src_tainted) {
src_time = sq->srctime =
gst_segment_to_running_time (&sq->src_segment, GST_FORMAT_TIME,
sq->src_segment.last_stop);
/* if we have a time, we become untainted and use the time */
if (G_UNLIKELY (src_time != GST_CLOCK_TIME_NONE))
sq->src_tainted = FALSE;
} else
src_time = sq->srctime;
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 (G_LIKELY (sink_time != -1 && src_time != -1 && sink_time > src_time))
sq->cur_time = sink_time - src_time;
else
sq->cur_time = 0;
/* updating the time level can change the buffering state */
update_buffering (mq, sq);
return;
}
/* 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);
if (segment == &sq->sink_segment)
sq->sink_tainted = TRUE;
else
sq->src_tainted = TRUE;
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);
if (segment == &sq->sink_segment)
sq->sink_tainted = TRUE;
else
sq->src_tainted = TRUE;
/* 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 acceptcaps
* 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_buffer_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;
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 GstMultiQueueItem *
gst_multi_queue_event_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;
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 = NULL;
guint32 newid;
GstFlowReturn result;
sq = (GstSingleQueue *) gst_pad_get_element_private (pad);
mq = sq->mqueue;
GST_DEBUG_OBJECT (mq, "SingleQueue %d : trying to pop an object", sq->id);
if (sq->flushing)
goto out_flushing;
/* 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, sq->last_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 ||
(sq->last_oldid == G_MAXUINT32) || (newid != (sq->last_oldid + 1)) ||
sq->last_oldid > mq->highid) {
GST_LOG_OBJECT (mq, "CHECKING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
GST_MULTI_QUEUE_MUTEX_LOCK (mq);
/* Check again if we're flushing after the lock is taken,
* the flush flag might have been changed in the meantime */
if (sq->flushing) {
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
goto out_flushing;
}
/* 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 (sq->last_oldid != G_MAXUINT32)
sq->oldid = sq->last_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--;
if (sq->flushing) {
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
goto out_flushing;
}
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);
}
if (sq->flushing)
goto out_flushing;
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;
object = NULL;
if (result != GST_FLOW_OK && result != GST_FLOW_NOT_LINKED
&& result != GST_FLOW_UNEXPECTED)
goto out_flushing;
GST_LOG_OBJECT (mq, "AFTER PUSHING sq->srcresult: %s",
gst_flow_get_name (sq->srcresult));
sq->last_oldid = newid;
return;
out_flushing:
{
if (object)
gst_mini_object_unref (object);
/* 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);
/* upstream needs to see fatal result ASAP to shut things down,
* but might be stuck in one of our other full queues;
* so empty this one and trigger dynamic queue growth. At
* this point the srcresult is not OK, NOT_LINKED
* or UNEXPECTED, i.e. a real failure */
gst_data_queue_flush (sq->queue);
single_queue_underrun_cb (sq->queue, sq);
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;
guint32 curid;
GstClockTime timestamp, duration;
sq = gst_pad_get_element_private (pad);
mq = sq->mqueue;
/* if eos, we are always full, so avoid hanging incoming indefinitely */
if (sq->is_eos)
goto was_eos;
/* Get a unique incrementing id */
curid = g_atomic_int_exchange_and_add ((gint *) & mq->counter, 1);
GST_LOG_OBJECT (mq, "SingleQueue %d : about to enqueue buffer %p with id %d",
sq->id, buffer, curid);
item = gst_multi_queue_buffer_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:
return sq->srcresult;
/* ERRORS */
flushing:
{
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);
goto done;
}
was_eos:
{
GST_DEBUG_OBJECT (mq, "we are EOS, dropping buffer, return UNEXPECTED");
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
}
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;
}
/* if eos, we are always full, so avoid hanging incoming indefinitely */
if (sq->is_eos)
goto was_eos;
/* Get an unique incrementing id. */
curid = g_atomic_int_exchange_and_add ((gint *) & mq->counter, 1);
item = gst_multi_queue_event_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;
/* EOS affects the buffering state */
update_buffering (mq, sq);
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;
}
was_eos:
{
GST_DEBUG_OBJECT (mq, "we are EOS, dropping event, return FALSE");
gst_event_unref (event);
res = FALSE;
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 gboolean
gst_multi_queue_acceptcaps (GstPad * pad, GstCaps * caps)
{
GstSingleQueue *sq = gst_pad_get_element_private (pad);
GstPad *otherpad;
gboolean result;
otherpad = (pad == sq->srcpad) ? sq->sinkpad : sq->srcpad;
GST_LOG_OBJECT (otherpad, "Accept caps from the peer of this pad");
result = gst_pad_peer_accept_caps (otherpad, caps);
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(q, format, value) (((q)->max_size.format) != 0 && \
((q)->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 *oq = (GstSingleQueue *) tmp->data;
GstDataQueueSize ssize;
GST_LOG_OBJECT (mq, "Checking Queue %d", oq->id);
if (gst_data_queue_is_empty (oq->queue)) {
GST_LOG_OBJECT (mq, "Queue %d is empty", oq->id);
if (IS_FILLED (sq, 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 (oq->queue, &ssize);
GST_DEBUG_OBJECT (mq,
"queue %d: visible %u/%u, bytes %u/%u, time %" G_GUINT64_FORMAT "/%"
G_GUINT64_FORMAT, oq->id, ssize.visible, oq->max_size.visible,
ssize.bytes, oq->max_size.bytes, oq->cur_time, oq->max_size.time);
/* if this queue is filled completely we must signal overrun.
* FIXME, this seems wrong in many ways
* - we're comparing the filled level of this queue against the
* values of the other one
* - we should only do this after we found no empty queues, ie, move
* this check outside of the loop
* - the debug statement talks about a different queue than the one
* we are checking here.
*/
if (sq->is_eos || IS_FILLED (sq, bytes, ssize.bytes) ||
IS_FILLED (sq, time, sq->cur_time)) {
GST_LOG_OBJECT (mq, "Queue %d is filled", oq->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 (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 *oq = (GstSingleQueue *) tmp->data;
if (gst_data_queue_is_full (oq->queue)) {
GstDataQueueSize size;
gst_data_queue_get_level (oq->queue, &size);
if (IS_FILLED (oq, visible, size.visible)) {
oq->max_size.visible = size.visible + 1;
GST_DEBUG_OBJECT (mq,
"queue %d is filled, bumping its max visible to %d", oq->id,
oq->max_size.visible);
gst_data_queue_limits_changed (oq->queue);
}
}
if (!gst_data_queue_is_empty (oq->queue))
empty = FALSE;
}
GST_MULTI_QUEUE_MUTEX_UNLOCK (mq);
if (empty) {
GST_DEBUG_OBJECT (mq, "All queues are empty, signalling it");
g_signal_emit (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;
GstMultiQueue *mq = sq->mqueue;
GST_DEBUG_OBJECT (mq,
"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 unless we are in buffering mode */
if (!mq->use_buffering && IS_FILLED (sq, visible, visible))
return TRUE;
/* check time or bytes */
res = IS_FILLED (sq, time, sq->cur_time) || IS_FILLED (sq, 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, gint id)
{
GstSingleQueue *sq;
gchar *name;
GList *tmp;
gint temp_id = (id == -1) ? 0 : id;
GST_MULTI_QUEUE_MUTEX_LOCK (mqueue);
/* Find an unused queue ID, if possible the passed one */
for (tmp = mqueue->queues; tmp; tmp = g_list_next (tmp)) {
GstSingleQueue *sq2 = (GstSingleQueue *) tmp->data;
/* This works because the IDs are sorted in ascending order */
if (sq2->id == temp_id) {
/* If this ID was requested by the caller return NULL,
* otherwise just get us the next one */
if (id == -1)
temp_id = sq2->id + 1;
else
return NULL;
} else if (sq2->id > temp_id) {
break;
}
}
sq = g_new0 (GstSingleQueue, 1);
mqueue->nbqueues++;
sq->id = temp_id;
mqueue->queues = g_list_insert_before (mqueue->queues, tmp, sq);
mqueue->queues_cookie++;
/* 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_full ((GstDataQueueCheckFullFunction)
single_queue_check_full,
(GstDataQueueFullCallback) single_queue_overrun_cb,
(GstDataQueueEmptyCallback) single_queue_underrun_cb, sq);
sq->is_eos = FALSE;
sq->flushing = 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 ();
sq->sinktime = GST_CLOCK_TIME_NONE;
sq->srctime = GST_CLOCK_TIME_NONE;
sq->sink_tainted = TRUE;
sq->src_tainted = TRUE;
name = g_strdup_printf ("sink%d", sq->id);
sq->sinkpad = gst_pad_new_from_static_template (&sinktemplate, name);
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_acceptcaps_function (sq->sinkpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_acceptcaps));
gst_pad_set_bufferalloc_function (sq->sinkpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_bufferalloc));
gst_pad_set_iterate_internal_links_function (sq->sinkpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_iterate_internal_links));
name = g_strdup_printf ("src%d", sq->id);
sq->srcpad = gst_pad_new_from_static_template (&srctemplate, name);
g_free (name);
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_acceptcaps_function (sq->srcpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_acceptcaps));
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_iterate_internal_links_function (sq->srcpad,
GST_DEBUG_FUNCPTR (gst_multi_queue_iterate_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;
}
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