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434e7042d8
There's no code that uses it other than multiqueue, so make it private to multiqueue for now. That way we can also do optimisations that require API/ABI breaks. If anyone ever wants to use it, we can still make it public again.
660 lines
19 KiB
C
660 lines
19 KiB
C
/* GStreamer
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* Copyright (C) 2006 Edward Hervey <edward@fluendo.com>
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*
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* gstdataqueue.c:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstdataqueue
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* @short_description: Threadsafe queueing object
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*
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* #GstDataQueue is an object that handles threadsafe queueing of objects. It
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* also provides size-related functionality. This object should be used for
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* any #GstElement that wishes to provide some sort of queueing functionality.
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*
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* Since: 0.10.11
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*/
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#include <gst/gst.h>
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#include "string.h"
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#include "gstdataqueue.h"
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GST_DEBUG_CATEGORY_STATIC (data_queue_debug);
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#define GST_CAT_DEFAULT (data_queue_debug)
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GST_DEBUG_CATEGORY_STATIC (data_queue_dataflow);
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/* Queue signals and args */
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enum
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{
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SIGNAL_EMPTY,
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SIGNAL_FULL,
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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ARG_CUR_LEVEL_VISIBLE,
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ARG_CUR_LEVEL_BYTES,
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ARG_CUR_LEVEL_TIME
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/* FILL ME */
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};
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#define GST_DATA_QUEUE_MUTEX_LOCK(q) G_STMT_START { \
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GST_CAT_LOG (data_queue_dataflow, \
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"locking qlock from thread %p", \
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g_thread_self ()); \
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g_mutex_lock (q->qlock); \
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GST_CAT_LOG (data_queue_dataflow, \
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"locked qlock from thread %p", \
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g_thread_self ()); \
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} G_STMT_END
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#define GST_DATA_QUEUE_MUTEX_LOCK_CHECK(q, label) G_STMT_START { \
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GST_DATA_QUEUE_MUTEX_LOCK (q); \
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if (q->flushing) \
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goto label; \
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} G_STMT_END
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#define GST_DATA_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
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GST_CAT_LOG (data_queue_dataflow, \
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"unlocking qlock from thread %p", \
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g_thread_self ()); \
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g_mutex_unlock (q->qlock); \
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} G_STMT_END
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#define STATUS(q, msg) \
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GST_CAT_LOG (data_queue_dataflow, \
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"queue:%p " msg ": %u visible items, %u " \
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"bytes, %"G_GUINT64_FORMAT \
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" ns, %u elements", \
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queue, \
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q->cur_level.visible, \
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q->cur_level.bytes, \
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q->cur_level.time, \
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q->queue->length)
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static void gst_data_queue_finalize (GObject * object);
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static void gst_data_queue_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_data_queue_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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static GObjectClass *parent_class = NULL;
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static guint gst_data_queue_signals[LAST_SIGNAL] = { 0 };
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#define _do_init \
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{ \
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GST_DEBUG_CATEGORY_INIT (data_queue_debug, "dataqueue", 0, \
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"data queue object"); \
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GST_DEBUG_CATEGORY_INIT (data_queue_dataflow, "data_queue_dataflow", 0, \
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"dataflow inside the data queue object"); \
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}
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G_DEFINE_TYPE_WITH_CODE (GstDataQueue, gst_data_queue, G_TYPE_OBJECT, _do_init);
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static void
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gst_data_queue_class_init (GstDataQueueClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_data_queue_set_property;
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gobject_class->get_property = gst_data_queue_get_property;
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/* signals */
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/**
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* GstDataQueue::empty:
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* @queue: the queue instance
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*
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* Reports that the queue became empty (empty).
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* A queue is empty if the total amount of visible items inside it (num-visible, time,
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* size) is lower than the boundary values which can be set through the GObject
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* properties.
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*/
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gst_data_queue_signals[SIGNAL_EMPTY] =
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g_signal_new ("empty", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GstDataQueueClass, empty), NULL, NULL,
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g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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/**
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* GstDataQueue::full:
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* @queue: the queue instance
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*
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* Reports that the queue became full (full).
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* A queue is full if the total amount of data inside it (num-visible, time,
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* size) is higher than the boundary values which can be set through the GObject
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* properties.
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*/
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gst_data_queue_signals[SIGNAL_FULL] =
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g_signal_new ("full", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GstDataQueueClass, full), NULL, NULL,
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g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
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/* properties */
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g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BYTES,
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g_param_spec_uint ("current-level-bytes", "Current level (kB)",
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"Current amount of data in the queue (bytes)",
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0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_VISIBLE,
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g_param_spec_uint ("current-level-visible",
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"Current level (visible items)",
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"Current number of visible items in the queue", 0, G_MAXUINT, 0,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_TIME,
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g_param_spec_uint64 ("current-level-time", "Current level (ns)",
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"Current amount of data in the queue (in ns)", 0, G_MAXUINT64, 0,
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G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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gobject_class->finalize = gst_data_queue_finalize;
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}
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static void
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gst_data_queue_init (GstDataQueue * queue)
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{
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queue->cur_level.visible = 0; /* no content */
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queue->cur_level.bytes = 0; /* no content */
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queue->cur_level.time = 0; /* no content */
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queue->checkfull = NULL;
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queue->qlock = g_mutex_new ();
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queue->item_add = g_cond_new ();
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queue->item_del = g_cond_new ();
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queue->queue = g_queue_new ();
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GST_DEBUG ("initialized queue's not_empty & not_full conditions");
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}
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/**
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* gst_data_queue_new_full:
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* @checkfull: the callback used to tell if the element considers the queue full
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* or not.
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* @fullcallback: the callback which will be called when the queue is considered full.
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* @emptycallback: the callback which will be called when the queue is considered empty.
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* @checkdata: a #gpointer that will be given in the @checkfull callback.
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*
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* Creates a new #GstDataQueue. The difference with @gst_data_queue_new is that it will
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* not emit the 'full' and 'empty' signals, but instead calling directly @fullcallback
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* or @emptycallback.
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*
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* Returns: a new #GstDataQueue.
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*
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* Since: 0.10.26
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*/
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GstDataQueue *
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gst_data_queue_new_full (GstDataQueueCheckFullFunction checkfull,
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GstDataQueueFullCallback fullcallback,
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GstDataQueueEmptyCallback emptycallback, gpointer checkdata)
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{
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GstDataQueue *ret;
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g_return_val_if_fail (checkfull != NULL, NULL);
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ret = g_object_newv (GST_TYPE_DATA_QUEUE, 0, NULL);
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ret->checkfull = checkfull;
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ret->checkdata = checkdata;
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ret->fullcallback = fullcallback;
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ret->emptycallback = emptycallback;
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return ret;
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}
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/**
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* gst_data_queue_new:
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* @checkfull: the callback used to tell if the element considers the queue full
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* or not.
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* @checkdata: a #gpointer that will be given in the @checkfull callback.
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*
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* Returns: a new #GstDataQueue.
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*/
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GstDataQueue *
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gst_data_queue_new (GstDataQueueCheckFullFunction checkfull, gpointer checkdata)
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{
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return gst_data_queue_new_full (checkfull, NULL, NULL, checkdata);
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}
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static void
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gst_data_queue_cleanup (GstDataQueue * queue)
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{
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while (!g_queue_is_empty (queue->queue)) {
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GstDataQueueItem *item = g_queue_pop_head (queue->queue);
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/* Just call the destroy notify on the item */
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item->destroy (item);
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}
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queue->cur_level.visible = 0;
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queue->cur_level.bytes = 0;
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queue->cur_level.time = 0;
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}
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/* called only once, as opposed to dispose */
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static void
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gst_data_queue_finalize (GObject * object)
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{
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GstDataQueue *queue = GST_DATA_QUEUE (object);
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GST_DEBUG ("finalizing queue");
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gst_data_queue_cleanup (queue);
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g_queue_free (queue->queue);
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GST_DEBUG ("free mutex");
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g_mutex_free (queue->qlock);
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GST_DEBUG ("done free mutex");
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g_cond_free (queue->item_add);
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g_cond_free (queue->item_del);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static inline void
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gst_data_queue_locked_flush (GstDataQueue * queue)
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{
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STATUS (queue, "before flushing");
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gst_data_queue_cleanup (queue);
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STATUS (queue, "after flushing");
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/* we deleted something... */
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if (queue->waiting_del)
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g_cond_signal (queue->item_del);
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}
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static inline gboolean
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gst_data_queue_locked_is_empty (GstDataQueue * queue)
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{
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return (queue->queue->length == 0);
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}
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static inline gboolean
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gst_data_queue_locked_is_full (GstDataQueue * queue)
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{
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return queue->checkfull (queue, queue->cur_level.visible,
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queue->cur_level.bytes, queue->cur_level.time, queue->checkdata);
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}
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/**
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* gst_data_queue_flush:
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* @queue: a #GstDataQueue.
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*
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* Flushes all the contents of the @queue. Any call to #gst_data_queue_push and
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* #gst_data_queue_pop will be released.
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* MT safe.
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*
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* Since: 0.10.11
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*/
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void
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gst_data_queue_flush (GstDataQueue * queue)
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{
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GST_DEBUG ("queue:%p", queue);
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GST_DATA_QUEUE_MUTEX_LOCK (queue);
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gst_data_queue_locked_flush (queue);
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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}
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/**
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* gst_data_queue_is_empty:
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* @queue: a #GstDataQueue.
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*
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* Queries if there are any items in the @queue.
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* MT safe.
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*
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* Returns: #TRUE if @queue is empty.
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*
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* Since: 0.10.11
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*/
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gboolean
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gst_data_queue_is_empty (GstDataQueue * queue)
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{
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gboolean res;
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GST_DATA_QUEUE_MUTEX_LOCK (queue);
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res = gst_data_queue_locked_is_empty (queue);
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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return res;
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}
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/**
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* gst_data_queue_is_full:
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* @queue: a #GstDataQueue.
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*
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* Queries if @queue is full. This check will be done using the
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* #GstDataQueueCheckFullFunction registered with @queue.
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* MT safe.
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*
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* Returns: #TRUE if @queue is full.
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*
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* Since: 0.10.11
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*/
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gboolean
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gst_data_queue_is_full (GstDataQueue * queue)
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{
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gboolean res;
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GST_DATA_QUEUE_MUTEX_LOCK (queue);
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res = gst_data_queue_locked_is_full (queue);
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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return res;
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}
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/**
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* gst_data_queue_set_flushing:
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* @queue: a #GstDataQueue.
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* @flushing: a #gboolean stating if the queue will be flushing or not.
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*
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* Sets the queue to flushing state if @flushing is #TRUE. If set to flushing
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* state, any incoming data on the @queue will be discarded. Any call currently
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* blocking on #gst_data_queue_push or #gst_data_queue_pop will return straight
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* away with a return value of #FALSE. While the @queue is in flushing state,
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* all calls to those two functions will return #FALSE.
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*
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* MT Safe.
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*
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* Since: 0.10.11
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*/
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void
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gst_data_queue_set_flushing (GstDataQueue * queue, gboolean flushing)
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{
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GST_DEBUG ("queue:%p , flushing:%d", queue, flushing);
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GST_DATA_QUEUE_MUTEX_LOCK (queue);
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queue->flushing = flushing;
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if (flushing) {
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/* release push/pop functions */
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if (queue->waiting_add)
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g_cond_signal (queue->item_add);
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if (queue->waiting_del)
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g_cond_signal (queue->item_del);
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}
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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}
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/**
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* gst_data_queue_push:
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* @queue: a #GstDataQueue.
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* @item: a #GstDataQueueItem.
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*
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* Pushes a #GstDataQueueItem (or a structure that begins with the same fields)
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* on the @queue. If the @queue is full, the call will block until space is
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* available, OR the @queue is set to flushing state.
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* MT safe.
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*
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* Note that this function has slightly different semantics than gst_pad_push()
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* and gst_pad_push_event(): this function only takes ownership of @item and
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* the #GstMiniObject contained in @item if the push was successful. If FALSE
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* is returned, the caller is responsible for freeing @item and its contents.
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*
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* Returns: #TRUE if the @item was successfully pushed on the @queue.
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*
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* Since: 0.10.11
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*/
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gboolean
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gst_data_queue_push (GstDataQueue * queue, GstDataQueueItem * item)
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{
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g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
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g_return_val_if_fail (item != NULL, FALSE);
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GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);
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STATUS (queue, "before pushing");
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/* We ALWAYS need to check for queue fillness */
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if (gst_data_queue_locked_is_full (queue)) {
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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if (G_LIKELY (queue->fullcallback))
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queue->fullcallback (queue, queue->checkdata);
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else
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g_signal_emit (queue, gst_data_queue_signals[SIGNAL_FULL], 0);
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GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);
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/* signal might have removed some items */
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while (gst_data_queue_locked_is_full (queue)) {
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queue->waiting_del = TRUE;
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g_cond_wait (queue->item_del, queue->qlock);
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queue->waiting_del = FALSE;
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if (queue->flushing)
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goto flushing;
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}
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}
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g_queue_push_tail (queue->queue, item);
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if (item->visible)
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queue->cur_level.visible++;
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queue->cur_level.bytes += item->size;
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queue->cur_level.time += item->duration;
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STATUS (queue, "after pushing");
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if (queue->waiting_add)
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g_cond_signal (queue->item_add);
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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return TRUE;
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/* ERRORS */
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flushing:
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{
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GST_DEBUG ("queue:%p, we are flushing", queue);
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
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return FALSE;
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}
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}
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/**
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* gst_data_queue_pop:
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* @queue: a #GstDataQueue.
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* @item: pointer to store the returned #GstDataQueueItem.
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*
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* Retrieves the first @item available on the @queue. If the queue is currently
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* empty, the call will block until at least one item is available, OR the
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* @queue is set to the flushing state.
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* MT safe.
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*
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* Returns: #TRUE if an @item was successfully retrieved from the @queue.
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*
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* Since: 0.10.11
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*/
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gboolean
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gst_data_queue_pop (GstDataQueue * queue, GstDataQueueItem ** item)
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{
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g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
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g_return_val_if_fail (item != NULL, FALSE);
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GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);
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STATUS (queue, "before popping");
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if (gst_data_queue_locked_is_empty (queue)) {
|
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GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
if (G_LIKELY (queue->emptycallback))
|
|
queue->emptycallback (queue, queue->checkdata);
|
|
else
|
|
g_signal_emit (queue, gst_data_queue_signals[SIGNAL_EMPTY], 0);
|
|
GST_DATA_QUEUE_MUTEX_LOCK_CHECK (queue, flushing);
|
|
|
|
while (gst_data_queue_locked_is_empty (queue)) {
|
|
queue->waiting_add = TRUE;
|
|
g_cond_wait (queue->item_add, queue->qlock);
|
|
queue->waiting_add = FALSE;
|
|
if (queue->flushing)
|
|
goto flushing;
|
|
}
|
|
}
|
|
|
|
/* Get the item from the GQueue */
|
|
*item = g_queue_pop_head (queue->queue);
|
|
|
|
/* update current level counter */
|
|
if ((*item)->visible)
|
|
queue->cur_level.visible--;
|
|
queue->cur_level.bytes -= (*item)->size;
|
|
queue->cur_level.time -= (*item)->duration;
|
|
|
|
STATUS (queue, "after popping");
|
|
if (queue->waiting_del)
|
|
g_cond_signal (queue->item_del);
|
|
|
|
GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
flushing:
|
|
{
|
|
GST_DEBUG ("queue:%p, we are flushing", queue);
|
|
GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_data_queue_drop_head:
|
|
* @queue: The #GstDataQueue to drop an item from.
|
|
* @type: The #GType of the item to drop.
|
|
*
|
|
* Pop and unref the head-most #GstMiniObject with the given #GType.
|
|
*
|
|
* Returns: TRUE if an element was removed.
|
|
*
|
|
* Since: 0.10.11
|
|
*/
|
|
gboolean
|
|
gst_data_queue_drop_head (GstDataQueue * queue, GType type)
|
|
{
|
|
gboolean res = FALSE;
|
|
GList *item;
|
|
GstDataQueueItem *leak = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_DATA_QUEUE (queue), FALSE);
|
|
|
|
GST_DEBUG ("queue:%p", queue);
|
|
|
|
GST_DATA_QUEUE_MUTEX_LOCK (queue);
|
|
for (item = g_queue_peek_head_link (queue->queue); item; item = item->next) {
|
|
GstDataQueueItem *tmp = (GstDataQueueItem *) item->data;
|
|
|
|
if (G_TYPE_CHECK_INSTANCE_TYPE (tmp->object, type)) {
|
|
leak = tmp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!leak)
|
|
goto done;
|
|
|
|
g_queue_delete_link (queue->queue, item);
|
|
|
|
if (leak->visible)
|
|
queue->cur_level.visible--;
|
|
queue->cur_level.bytes -= leak->size;
|
|
queue->cur_level.time -= leak->duration;
|
|
|
|
leak->destroy (leak);
|
|
|
|
res = TRUE;
|
|
|
|
done:
|
|
GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
|
|
GST_DEBUG ("queue:%p , res:%d", queue, res);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_data_queue_limits_changed:
|
|
* @queue: The #GstDataQueue
|
|
*
|
|
* Inform the queue that the limits for the fullness check have changed and that
|
|
* any blocking gst_data_queue_push() should be unblocked to recheck the limts.
|
|
*
|
|
* Since: 0.10.11
|
|
*/
|
|
void
|
|
gst_data_queue_limits_changed (GstDataQueue * queue)
|
|
{
|
|
g_return_if_fail (GST_IS_DATA_QUEUE (queue));
|
|
|
|
GST_DATA_QUEUE_MUTEX_LOCK (queue);
|
|
if (queue->waiting_del) {
|
|
GST_DEBUG ("signal del");
|
|
g_cond_signal (queue->item_del);
|
|
}
|
|
GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
}
|
|
|
|
/**
|
|
* gst_data_queue_get_level:
|
|
* @queue: The #GstDataQueue
|
|
* @level: the location to store the result
|
|
*
|
|
* Get the current level of the queue.
|
|
*
|
|
* Since: 0.10.11
|
|
*/
|
|
void
|
|
gst_data_queue_get_level (GstDataQueue * queue, GstDataQueueSize * level)
|
|
{
|
|
memcpy (level, (&queue->cur_level), sizeof (GstDataQueueSize));
|
|
}
|
|
|
|
static void
|
|
gst_data_queue_set_property (GObject * object,
|
|
guint prop_id, const GValue * value, GParamSpec * pspec)
|
|
{
|
|
switch (prop_id) {
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_data_queue_get_property (GObject * object,
|
|
guint prop_id, GValue * value, GParamSpec * pspec)
|
|
{
|
|
GstDataQueue *queue = GST_DATA_QUEUE (object);
|
|
|
|
GST_DATA_QUEUE_MUTEX_LOCK (queue);
|
|
|
|
switch (prop_id) {
|
|
case ARG_CUR_LEVEL_BYTES:
|
|
g_value_set_uint (value, queue->cur_level.bytes);
|
|
break;
|
|
case ARG_CUR_LEVEL_VISIBLE:
|
|
g_value_set_uint (value, queue->cur_level.visible);
|
|
break;
|
|
case ARG_CUR_LEVEL_TIME:
|
|
g_value_set_uint64 (value, queue->cur_level.time);
|
|
break;
|
|
default:
|
|
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
|
|
break;
|
|
}
|
|
|
|
GST_DATA_QUEUE_MUTEX_UNLOCK (queue);
|
|
}
|