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/* GStreamer
* Copyright (C) 2010, 2012 Alexander Saprykin <xelfium@gmail.com>
*
* gsttocsetter.c: interface for TOC setting on elements
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsttocsetter
* @short_description: Element interface that allows setting and retrieval
* of the TOC
*
* Element interface that allows setting of the TOC.
*
* Elements that support some kind of chapters or editions (or tracks like in
* the FLAC cue sheet) will implement this interface.
*
* If you just want to retrieve the TOC in your application then all you
* need to do is watch for TOC messages on your pipeline's bus (or you can
* perform TOC query). This interface is only for setting TOC data, not for
* extracting it. To set TOC from the application, find proper tocsetter element
* and set TOC using gst_toc_setter_set_toc().
*
* Elements implementing the #GstTocSetter interface can extend existing TOC
* by getting extend UID for that (you can use gst_toc_find_entry() to retrieve it)
* with any TOC entries received from downstream.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gst_private.h"
#include "gsttocsetter.h"
#include <gobject/gvaluecollector.h>
#include <string.h>
static GQuark gst_toc_key;
G_DEFINE_INTERFACE_WITH_CODE (GstTocSetter, gst_toc_setter, GST_TYPE_ELEMENT,
gst_toc_key = g_quark_from_static_string ("gst-toc-setter-data"););
static void
gst_toc_setter_default_init (GstTocSetterInterface * klass)
{
/* nothing to do here, it's a dummy interface */
}
typedef struct
{
GstToc *toc;
GMutex lock;
} GstTocData;
static void
gst_toc_data_free (gpointer p)
{
GstTocData *data = (GstTocData *) p;
if (data->toc)
gst_toc_unref (data->toc);
g_mutex_clear (&data->lock);
g_slice_free (GstTocData, data);
}
static GstTocData *
gst_toc_setter_get_data (GstTocSetter * setter)
{
GstTocData *data;
data = g_object_get_qdata (G_OBJECT (setter), gst_toc_key);
if (!data) {
static GMutex create_mutex;
/* make sure no other thread is creating a GstTocData at the same time */
g_mutex_lock (&create_mutex);
data = g_object_get_qdata (G_OBJECT (setter), gst_toc_key);
if (!data) {
data = g_slice_new (GstTocData);
g_mutex_init (&data->lock);
data->toc = NULL;
g_object_set_qdata_full (G_OBJECT (setter), gst_toc_key, data,
gst_toc_data_free);
}
g_mutex_unlock (&create_mutex);
}
return data;
}
/**
* gst_toc_setter_reset:
* @setter: a #GstTocSetter.
*
* Reset the internal TOC. Elements should call this from within the
* state-change handler.
*/
void
gst_toc_setter_reset (GstTocSetter * setter)
{
g_return_if_fail (GST_IS_TOC_SETTER (setter));
gst_toc_setter_set_toc (setter, NULL);
}
/**
* gst_toc_setter_get_toc:
* @setter: a #GstTocSetter.
*
* Return current TOC the setter uses. The TOC should not be
* modified without making it writable first.
*
*
* Returns: (transfer full): TOC set, or NULL. Unref with gst_toc_unref()
* when no longer needed
*/
GstToc *
gst_toc_setter_get_toc (GstTocSetter * setter)
{
GstTocData *data;
GstToc *ret = NULL;
g_return_val_if_fail (GST_IS_TOC_SETTER (setter), NULL);
data = gst_toc_setter_get_data (setter);
g_mutex_lock (&data->lock);
if (data->toc != NULL)
ret = gst_toc_ref (data->toc);
g_mutex_unlock (&data->lock);
return ret;
}
/**
* gst_toc_setter_set_toc:
* @setter: a #GstTocSetter.
* @toc: (allow-none): a #GstToc to set.
*
* Set the given TOC on the setter. Previously setted TOC will be
* unrefed before setting a new one.
*/
void
gst_toc_setter_set_toc (GstTocSetter * setter, GstToc * toc)
{
GstTocData *data;
g_return_if_fail (GST_IS_TOC_SETTER (setter));
data = gst_toc_setter_get_data (setter);
g_mutex_lock (&data->lock);
if (data->toc != toc) {
if (data->toc)
gst_toc_unref (data->toc);
data->toc = (toc) ? gst_toc_ref (toc) : NULL;
}
g_mutex_unlock (&data->lock);
}
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