author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 30 | 7e817e7e631c |
parent 29 | 567bb019e3e3 |
permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de> |
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* |
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* gsttagsetter.c: interface for tag setting on elements |
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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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/** |
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* SECTION:gsttagsetter |
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* @short_description: Element interface that allows setting and retrieval |
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* of media metadata |
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* |
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* <refsect2> |
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* <para> |
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* Element interface that allows setting of media metadata. |
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* </para> |
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* <para> |
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* Elements that support changing a stream's metadata will implement this |
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* interface. Examples of such elements are 'vorbisenc', 'theoraenc' and |
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* 'id3v2mux'. |
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* </para> |
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* <para> |
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* If you just want to retrieve metadata in your application then all you |
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* need to do is watch for tag messages on your pipeline's bus. This |
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* interface is only for setting metadata, not for extracting it. To set tags |
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* from the application, find tagsetter elements and set tags using e.g. |
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* gst_tag_setter_merge_tags() or gst_tag_setter_add_tags(). The application |
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* should do that before the element goes to %GST_STATE_PAUSED. |
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* </para> |
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* <para> |
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* Elements implementing the #GstTagSetter interface often have to merge |
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* any tags received from upstream and the tags set by the application via |
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* the interface. This can be done like this: |
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* </para> |
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* <para> |
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* <programlisting> |
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* GstTagMergeMode merge_mode; |
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* const GstTagList *application_tags; |
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* const GstTagList *event_tags; |
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* GstTagSetter *tagsetter; |
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* GstTagList *result; |
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* |
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* tagsetter = GST_TAG_SETTER (element); |
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* |
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* merge_mode = gst_tag_setter_get_tag_merge_mode (tagsetter); |
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* tagsetter_tags = gst_tag_setter_get_tag_list (tagsetter); |
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* event_tags = (const GstTagList *) element->event_tags; |
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* |
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* GST_LOG_OBJECT (tagsetter, "merging tags, merge mode = %d", merge_mode); |
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* GST_LOG_OBJECT (tagsetter, "event tags: %" GST_PTR_FORMAT, event_tags); |
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* GST_LOG_OBJECT (tagsetter, "set tags: %" GST_PTR_FORMAT, application_tags); |
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* |
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* result = gst_tag_list_merge (application_tags, event_tags, merge_mode); |
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* |
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* GST_LOG_OBJECT (tagsetter, "final tags: %" GST_PTR_FORMAT, result); |
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* </programlisting> |
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* </para> |
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* <para> |
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* Last reviewed on 2006-05-18 (0.10.6) |
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* </para> |
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* </refsect2> |
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*/ |
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#ifdef HAVE_CONFIG_H |
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# include "config.h" |
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#endif |
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#include "gst_private.h" |
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#include "gsttagsetter.h" |
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#include <gobject/gvaluecollector.h> |
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#include <string.h> |
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GST_DEBUG_CATEGORY_STATIC (gst_tag_interface_debug); |
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#define GST_CAT_DEFAULT tag_tag_interface_debug |
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static GQuark gst_tag_key; |
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typedef struct |
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{ |
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GstTagMergeMode mode; |
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GstTagList *list; |
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} |
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GstTagData; |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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GType |
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gst_tag_setter_get_type (void) |
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{ |
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static GType tag_setter_type = 0; |
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if (G_UNLIKELY (tag_setter_type == 0)) { |
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static const GTypeInfo tag_setter_info = { |
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sizeof (GstTagSetterIFace), /* class_size */ |
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NULL, /* base_init */ |
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NULL, /* base_finalize */ |
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NULL, |
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NULL, /* class_finalize */ |
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NULL, /* class_data */ |
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0, |
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0, |
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NULL |
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}; |
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GST_DEBUG_CATEGORY_INIT (gst_tag_interface_debug, "GstTagInterface", 0, |
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"interfaces for tagging"); |
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|
30 | 124 |
tag_setter_type = g_type_register_static (G_TYPE_INTERFACE, "GstTagSetter", |
0
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&tag_setter_info, 0); |
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|
30 | 127 |
g_type_interface_add_prerequisite (tag_setter_type, GST_TYPE_ELEMENT); |
0
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128 |
|
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gst_tag_key = g_quark_from_static_string ("GST_TAG_SETTER"); |
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} |
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131 |
|
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return tag_setter_type; |
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} |
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static void |
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gst_tag_data_free (gpointer p) |
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136 |
{ |
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GstTagData *data = (GstTagData *) p; |
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138 |
|
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if (data->list) |
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gst_tag_list_free (data->list); |
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141 |
|
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g_free (data); |
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} |
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static GstTagData * |
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gst_tag_setter_get_data (GstTagSetter * setter) |
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146 |
{ |
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GstTagData *data; |
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148 |
|
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data = g_object_get_qdata (G_OBJECT (setter), gst_tag_key); |
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if (!data) { |
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data = g_new (GstTagData, 1); |
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data->list = NULL; |
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data->mode = GST_TAG_MERGE_KEEP; |
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g_object_set_qdata_full (G_OBJECT (setter), gst_tag_key, data, |
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gst_tag_data_free); |
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} |
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157 |
|
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return data; |
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} |
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160 |
|
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/** |
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* gst_tag_setter_merge_tags: |
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* @setter: a #GstTagSetter |
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* @list: a tag list to merge from |
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* @mode: the mode to merge with |
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* |
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* Merges the given list into the setter's list using the given mode. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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172 |
|
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void |
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gst_tag_setter_merge_tags (GstTagSetter * setter, const GstTagList * list, |
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GstTagMergeMode mode) |
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{ |
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GstTagData *data; |
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178 |
|
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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g_return_if_fail (GST_IS_TAG_LIST (list)); |
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182 |
|
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data = gst_tag_setter_get_data (setter); |
30 | 184 |
if (!data->list) { |
185 |
data->list = gst_tag_list_copy (list); |
|
0
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} else { |
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gst_tag_list_insert (data->list, list, mode); |
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} |
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} |
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190 |
|
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/** |
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* gst_tag_setter_add_tags: |
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* @setter: a #GstTagSetter |
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* @mode: the mode to use |
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* @tag: tag to set |
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* @...: more tag / value pairs to set |
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* |
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* Adds the given tag / value pairs on the setter using the given merge mode. |
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* The list must be terminated with NULL. |
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*/ |
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#ifdef __SYMBIAN32__ |
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202 |
EXPORT_C |
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#endif |
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204 |
|
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205 |
void |
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gst_tag_setter_add_tags (GstTagSetter * setter, GstTagMergeMode mode, |
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const gchar * tag, ...) |
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{ |
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va_list args; |
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210 |
|
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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213 |
|
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va_start (args, tag); |
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gst_tag_setter_add_tag_valist (setter, mode, tag, args); |
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va_end (args); |
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} |
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218 |
|
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/** |
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* gst_tag_setter_add_tag_values: |
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* @setter: a #GstTagSetter |
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* @mode: the mode to use |
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* @tag: tag to set |
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* @...: more tag / GValue pairs to set |
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* |
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* Adds the given tag / GValue pairs on the setter using the given merge mode. |
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* The list must be terminated with NULL. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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void |
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gst_tag_setter_add_tag_values (GstTagSetter * setter, GstTagMergeMode mode, |
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const gchar * tag, ...) |
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{ |
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va_list args; |
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|
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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|
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va_start (args, tag); |
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gst_tag_setter_add_tag_valist_values (setter, mode, tag, args); |
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va_end (args); |
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} |
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|
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/** |
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* gst_tag_setter_add_tag_valist: |
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* @setter: a #GstTagSetter |
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* @mode: the mode to use |
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* @tag: tag to set |
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* @var_args: tag / value pairs to set |
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* |
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* Adds the given tag / value pairs on the setter using the given merge mode. |
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* The list must be terminated with NULL. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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void |
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gst_tag_setter_add_tag_valist (GstTagSetter * setter, GstTagMergeMode mode, |
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const gchar * tag, va_list var_args) |
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{ |
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GstTagData *data; |
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|
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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269 |
|
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data = gst_tag_setter_get_data (setter); |
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if (!data->list) |
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data->list = gst_tag_list_new (); |
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|
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gst_tag_list_add_valist (data->list, mode, tag, var_args); |
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} |
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|
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/** |
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* gst_tag_setter_add_tag_valist_values: |
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* @setter: a #GstTagSetter |
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* @mode: the mode to use |
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* @tag: tag to set |
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* @var_args: tag / GValue pairs to set |
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* |
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* Adds the given tag / GValue pairs on the setter using the given merge mode. |
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* The list must be terminated with NULL. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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void |
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gst_tag_setter_add_tag_valist_values (GstTagSetter * setter, |
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GstTagMergeMode mode, const gchar * tag, va_list var_args) |
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{ |
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GstTagData *data; |
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|
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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|
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data = gst_tag_setter_get_data (setter); |
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if (!data->list) |
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data->list = gst_tag_list_new (); |
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|
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gst_tag_list_add_valist_values (data->list, mode, tag, var_args); |
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} |
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|
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/** |
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* gst_tag_setter_get_tag_list: |
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* @setter: a #GstTagSetter |
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* |
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* Returns the current list of tags the setter uses. The list should not be |
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* modified or freed. |
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* |
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* Returns: a current snapshot of the taglist used in the setter |
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* or NULL if none is used. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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G_CONST_RETURN GstTagList * |
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gst_tag_setter_get_tag_list (GstTagSetter * setter) |
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{ |
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g_return_val_if_fail (GST_IS_TAG_SETTER (setter), NULL); |
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|
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return gst_tag_setter_get_data (setter)->list; |
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} |
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|
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/** |
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* gst_tag_setter_set_tag_merge_mode: |
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* @setter: a #GstTagSetter |
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* @mode: The mode with which tags are added |
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* |
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* Sets the given merge mode that is used for adding tags from events to tags |
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* specified by this interface. The default is #GST_TAG_MERGE_KEEP, which keeps |
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* the tags set with this interface and discards tags from events. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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void |
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gst_tag_setter_set_tag_merge_mode (GstTagSetter * setter, GstTagMergeMode mode) |
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{ |
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g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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|
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gst_tag_setter_get_data (setter)->mode = mode; |
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} |
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|
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/** |
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* gst_tag_setter_get_tag_merge_mode: |
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* @setter: a #GstTagSetter |
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* |
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* Queries the mode by which tags inside the setter are overwritten by tags |
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* from events |
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* |
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* Returns: the merge mode used inside the element. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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GstTagMergeMode |
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gst_tag_setter_get_tag_merge_mode (GstTagSetter * setter) |
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{ |
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g_return_val_if_fail (GST_IS_TAG_SETTER (setter), FALSE); |
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|
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return gst_tag_setter_get_data (setter)->mode; |
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} |