gstreamer/gst/gsttocsetter.c

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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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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>
GST_DEBUG_CATEGORY_STATIC (gst_toc_interface_debug);
#define GST_CAT_DEFAULT tag_toc_interface_debug
static GQuark gst_toc_key;
typedef struct
{
GstToc *toc;
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GMutex lock;
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} GstTocData;
GType
gst_toc_setter_get_type (void)
{
static volatile gsize toc_setter_type = 0;
if (g_once_init_enter (&toc_setter_type)) {
GType _type;
static const GTypeInfo toc_setter_info = {
sizeof (GstTocSetterIFace), /* class_size */
NULL, /* base_init */
NULL, /* base_finalize */
NULL,
NULL, /* class_finalize */
NULL, /* class_data */
0,
0,
NULL
};
GST_DEBUG_CATEGORY_INIT (gst_toc_interface_debug, "GstTocInterface", 0,
"interfaces for the TOC");
_type = g_type_register_static (G_TYPE_INTERFACE, "GstTocSetter",
&toc_setter_info, 0);
g_type_interface_add_prerequisite (_type, GST_TYPE_ELEMENT);
gst_toc_key = g_quark_from_static_string ("GST_TOC_SETTER");
g_once_init_leave (&toc_setter_type, _type);
}
return toc_setter_type;
}
static void
gst_toc_data_free (gpointer p)
{
GstTocData *data = (GstTocData *) p;
if (data->toc)
gst_toc_free (data->toc);
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g_mutex_clear (&data->lock);
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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) {
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static GMutex create_mutex;
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/* make sure no other thread is creating a GstTocData at the same time */
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g_mutex_lock (&create_mutex);
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data = g_object_get_qdata (G_OBJECT (setter), gst_toc_key);
if (!data) {
data = g_slice_new (GstTocData);
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g_mutex_init (&data->lock);
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data->toc = NULL;
g_object_set_qdata_full (G_OBJECT (setter), gst_toc_key, data,
gst_toc_data_free);
}
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g_mutex_unlock (&create_mutex);
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}
return data;
}
/**
* gst_toc_setter_reset_toc:
* @setter: a #GstTocSetter.
*
* Reset the internal TOC. Elements should call this from within the
* state-change handler.
*
* Since: 0.10.37
*/
void
gst_toc_setter_reset_toc (GstTocSetter * setter)
{
GstTocData *data;
g_return_if_fail (GST_IS_TOC_SETTER (setter));
data = gst_toc_setter_get_data (setter);
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g_mutex_lock (&data->lock);
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if (data->toc) {
gst_toc_free (data->toc);
data->toc = NULL;
}
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g_mutex_unlock (&data->lock);
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}
/**
* gst_toc_setter_get_toc:
* @setter: a #GstTocSetter.
*
* Return current TOC the setter uses. The TOC should not be
* modified or freed.
*
* This function is not thread-safe. Use gst_toc_setter_get_toc_copy() instead.
*
* Returns: a current snapshot of the TOC used in the setter
* or NULL if none is used.
*
* Since: 0.10.37
*/
const GstToc *
gst_toc_setter_get_toc (GstTocSetter * setter)
{
g_return_val_if_fail (GST_IS_TOC_SETTER (setter), NULL);
return gst_toc_setter_get_data (setter)->toc;
}
/**
* gst_toc_setter_get_toc_copy:
* @setter: a #GstTocSetter.
*
* Return current TOC the setter uses. The difference between this
* function and gst_toc_setter_get_toc() is that this function returns deep
* copy of the TOC, so you can modify it in any way. This function is thread-safe.
* Free it when done with gst_toc_free().
*
* Returns: a copy of the current snapshot of the TOC used in the setter
* or NULL if none is used.
*
* Since: 0.10.37
*/
GstToc *
gst_toc_setter_get_toc_copy (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);
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g_mutex_lock (&data->lock);
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if (data->toc != NULL)
ret = gst_toc_copy (data->toc);
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g_mutex_unlock (&data->lock);
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return ret;
}
/**
* gst_toc_setter_set_toc:
* @setter: a #GstTocSetter.
* @toc: a #GstToc to set.
*
* Set the given TOC on the setter. Previously setted TOC will be
* freed before setting a new one.
*
* Since: 0.10.37
*/
void
gst_toc_setter_set_toc (GstTocSetter * setter, const GstToc * toc)
{
GstTocData *data;
g_return_if_fail (GST_IS_TOC_SETTER (setter));
data = gst_toc_setter_get_data (setter);
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g_mutex_lock (&data->lock);
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if (data->toc)
gst_toc_free (data->toc);
data->toc = gst_toc_copy (toc);
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g_mutex_unlock (&data->lock);
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}
/**
* gst_toc_setter_get_toc_entry:
* @setter: a #GstTocSetter.
* @uid: UID to find entry with.
*
* Return #GstTocEntry (if any) with given @uid. Returned entry should
* not be modified or freed.
*
* This function is not thread-safe. Use gst_toc_setter_get_toc_entry_copy() instead.
*
* Returns: a TOC entry with given @uid from the TOC in the setter
* or NULL if none entry with such @uid was found.
*
* Since: 0.10.37
*/
const GstTocEntry *
gst_toc_setter_get_toc_entry (GstTocSetter * setter, const gchar * uid)
{
GstTocData *data;
const GstTocEntry *ret;
g_return_val_if_fail (GST_IS_TOC_SETTER (setter), NULL);
g_return_val_if_fail (uid != NULL, NULL);
data = gst_toc_setter_get_data (setter);
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g_mutex_lock (&data->lock);
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ret = gst_toc_find_entry (data->toc, uid);
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g_mutex_unlock (&data->lock);
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return ret;
}
/**
* gst_toc_setter_get_toc_entry_copy:
* @setter: a #GstTocSetter.
* @uid: UID to find entry with.
*
* Return #GstTocEntry (if any) with given @uid. It perform a deep copying,
* so you can modify returned value. Free it when done with gst_toc_entry_free().
* This function is thread-safe.
*
* Returns: a TOC entry with given @uid from the TOC in the setter
* or NULL if none entry with such @uid was found.
*
* Since: 0.10.37
*/
GstTocEntry *
gst_toc_setter_get_toc_entry_copy (GstTocSetter * setter, const gchar * uid)
{
GstTocData *data;
GstTocEntry *ret = NULL;
const GstTocEntry *search;
g_return_val_if_fail (GST_IS_TOC_SETTER (setter), NULL);
g_return_val_if_fail (uid != NULL, NULL);
data = gst_toc_setter_get_data (setter);
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g_mutex_lock (&data->lock);
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search = gst_toc_find_entry (data->toc, uid);
if (search != NULL)
ret = gst_toc_entry_copy (search);
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g_mutex_unlock (&data->lock);
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return ret;
}
/**
* gst_toc_setter_add_toc_entry:
* @setter: a #GstTocSetter.
* @parent_uid: UID of the parent entry to append given @entry. Use 0 for the TOC root level.
* @entry: #GstTocEntry to append.
*
* Try to find entry with given @parent_uid and append an @entry to that #GstTocEntry.
*
* Returns: TRUE if entry with @parent_uid was found, FALSE otherwise.
*
* Since: 0.10.37
*/
gboolean
gst_toc_setter_add_toc_entry (GstTocSetter * setter, const gchar * parent_uid,
const GstTocEntry * entry)
{
GstTocData *data;
GstTocEntry *parent;
GstTocEntry *copy_entry;
gboolean ret = FALSE;
g_return_val_if_fail (GST_IS_TOC_SETTER (setter), FALSE);
g_return_val_if_fail (parent_uid != NULL, FALSE);
g_return_val_if_fail (entry != NULL, FALSE);
data = gst_toc_setter_get_data (setter);
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g_mutex_lock (&data->lock);
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copy_entry = gst_toc_entry_copy (entry);
if (g_strcmp0 (parent_uid, "0") == 0)
data->toc->entries = g_list_append (data->toc->entries, copy_entry);
else {
parent = gst_toc_find_entry (data->toc, parent_uid);
if (parent != NULL) {
parent->subentries = g_list_append (parent->subentries, copy_entry);
ret = TRUE;
}
}
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g_mutex_unlock (&data->lock);
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return ret;
}