[21004] | 1 | /* GStreamer |
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| 2 | * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de> |
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| 3 | * |
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| 4 | * gsttaginterface.c: interface for tag setting on elements |
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| 5 | * |
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| 6 | * This library is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Library General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * This library is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Library General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Library General Public |
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| 17 | * License along with this library; if not, write to the |
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| 18 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 19 | * Boston, MA 02111-1307, USA. |
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| 20 | */ |
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| 21 | |
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| 22 | |
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| 23 | #ifdef HAVE_CONFIG_H |
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| 24 | # include "config.h" |
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| 25 | #endif |
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| 26 | |
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| 27 | #include "gst_private.h" |
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| 28 | #include "gsttaginterface.h" |
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| 29 | #include <gobject/gvaluecollector.h> |
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| 30 | #include <string.h> |
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| 31 | |
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| 32 | GST_DEBUG_CATEGORY_STATIC (gst_tag_interface_debug); |
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| 33 | #define GST_CAT_DEFAULT tag_tag_interface_debug |
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| 34 | |
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| 35 | static GQuark gst_tag_key; |
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| 36 | |
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| 37 | typedef struct |
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| 38 | { |
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| 39 | GstTagMergeMode mode; |
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| 40 | GstTagList *list; |
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| 41 | } |
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| 42 | GstTagData; |
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| 43 | |
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| 44 | GType |
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| 45 | gst_tag_setter_get_type (void) |
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| 46 | { |
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| 47 | static GType tag_setter_type = 0; |
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| 48 | |
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| 49 | if (!tag_setter_type) { |
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| 50 | static const GTypeInfo tag_setter_info = { |
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| 51 | sizeof (GstTagSetterIFace), /* class_size */ |
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| 52 | NULL, /* base_init */ |
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| 53 | NULL, /* base_finalize */ |
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| 54 | NULL, |
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| 55 | NULL, /* class_finalize */ |
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| 56 | NULL, /* class_data */ |
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| 57 | 0, |
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| 58 | 0, |
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| 59 | NULL |
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| 60 | }; |
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| 61 | |
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| 62 | GST_DEBUG_CATEGORY_INIT (gst_tag_interface_debug, "GstTagInterface", 0, |
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| 63 | "interfaces for tagging"); |
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| 64 | |
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| 65 | tag_setter_type = g_type_register_static (G_TYPE_INTERFACE, "GstTagSetter", |
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| 66 | &tag_setter_info, 0); |
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| 67 | |
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| 68 | g_type_interface_add_prerequisite (tag_setter_type, GST_TYPE_ELEMENT); |
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| 69 | |
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| 70 | gst_tag_key = g_quark_from_static_string ("GST_TAG_SETTER"); |
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| 71 | } |
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| 72 | |
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| 73 | return tag_setter_type; |
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| 74 | } |
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| 75 | static void |
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| 76 | gst_tag_data_free (gpointer p) |
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| 77 | { |
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| 78 | GstTagData *data = (GstTagData *) p; |
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| 79 | |
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| 80 | if (data->list) |
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| 81 | gst_tag_list_free (data->list); |
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| 82 | |
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| 83 | g_free (data); |
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| 84 | } |
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| 85 | static GstTagData * |
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| 86 | gst_tag_setter_get_data (GstTagSetter * setter) |
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| 87 | { |
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| 88 | GstTagData *data; |
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| 89 | |
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| 90 | data = g_object_get_qdata (G_OBJECT (setter), gst_tag_key); |
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| 91 | if (!data) { |
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| 92 | data = g_new (GstTagData, 1); |
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| 93 | data->list = NULL; |
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| 94 | data->mode = GST_TAG_MERGE_KEEP; |
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| 95 | g_object_set_qdata_full (G_OBJECT (setter), gst_tag_key, data, |
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| 96 | gst_tag_data_free); |
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| 97 | } |
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| 98 | |
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| 99 | return data; |
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| 100 | } |
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| 101 | |
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| 102 | /** |
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| 103 | * gst_tag_setter_merge: |
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| 104 | * @setter: a #GstTagSetter |
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| 105 | * @list: a tag list to merge from |
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| 106 | * @mode: the mode to merge with |
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| 107 | * |
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| 108 | * Merges the given list into the setter's list using the given mode. |
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| 109 | */ |
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| 110 | void |
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| 111 | gst_tag_setter_merge (GstTagSetter * setter, const GstTagList * list, |
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| 112 | GstTagMergeMode mode) |
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| 113 | { |
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| 114 | GstTagData *data; |
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| 115 | |
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| 116 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 117 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 118 | |
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| 119 | data = gst_tag_setter_get_data (setter); |
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| 120 | if (!data->list) { |
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| 121 | data->list = gst_tag_list_copy (list); |
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| 122 | } else { |
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| 123 | gst_tag_list_merge (data->list, list, mode); |
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| 124 | } |
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| 125 | } |
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| 126 | |
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| 127 | /** |
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| 128 | * gst_tag_setter_add: |
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| 129 | * @setter: a #GstTagSetter |
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| 130 | * @mode: the mode to use |
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| 131 | * @tag: tag to set |
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| 132 | * @...: more tag / value pairs to set |
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| 133 | * |
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| 134 | * Adds the given tag / value pairs on the setter using the given merge mode. |
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| 135 | * The list must be terminated with GST_TAG_INVALID. |
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| 136 | */ |
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| 137 | void |
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| 138 | gst_tag_setter_add (GstTagSetter * setter, GstTagMergeMode mode, |
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| 139 | const gchar * tag, ...) |
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| 140 | { |
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| 141 | va_list args; |
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| 142 | |
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| 143 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 144 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 145 | |
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| 146 | va_start (args, tag); |
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| 147 | gst_tag_setter_add_valist (setter, mode, tag, args); |
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| 148 | va_end (args); |
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| 149 | } |
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| 150 | |
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| 151 | /** |
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| 152 | * gst_tag_setter_add_values: |
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| 153 | * @setter: a #GstTagSetter |
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| 154 | * @mode: the mode to use |
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| 155 | * @tag: tag to set |
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| 156 | * @...: more tag / GValue pairs to set |
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| 157 | * |
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| 158 | * Adds the given tag / GValue pairs on the setter using the given merge mode. |
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| 159 | * The list must be terminated with GST_TAG_INVALID. |
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| 160 | */ |
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| 161 | void |
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| 162 | gst_tag_setter_add_values (GstTagSetter * setter, GstTagMergeMode mode, |
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| 163 | const gchar * tag, ...) |
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| 164 | { |
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| 165 | va_list args; |
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| 166 | |
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| 167 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 168 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 169 | |
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| 170 | va_start (args, tag); |
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| 171 | gst_tag_setter_add_valist_values (setter, mode, tag, args); |
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| 172 | va_end (args); |
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| 173 | } |
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| 174 | |
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| 175 | /** |
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| 176 | * gst_tag_setter_add_valist: |
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| 177 | * @setter: a #GstTagSetter |
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| 178 | * @mode: the mode to use |
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| 179 | * @tag: tag to set |
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| 180 | * @var_args: tag / value pairs to set |
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| 181 | * |
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| 182 | * Adds the given tag / value pairs on the setter using the given merge mode. |
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| 183 | * The list must be terminated with GST_TAG_INVALID. |
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| 184 | */ |
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| 185 | void |
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| 186 | gst_tag_setter_add_valist (GstTagSetter * setter, GstTagMergeMode mode, |
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| 187 | const gchar * tag, va_list var_args) |
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| 188 | { |
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| 189 | GstTagData *data; |
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| 190 | |
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| 191 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 192 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 193 | |
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| 194 | data = gst_tag_setter_get_data (setter); |
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| 195 | if (!data->list) |
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| 196 | data->list = gst_tag_list_new (); |
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| 197 | |
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| 198 | gst_tag_list_add_valist (data->list, mode, tag, var_args); |
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| 199 | } |
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| 200 | |
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| 201 | /** |
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| 202 | * gst_tag_setter_add_valist_values: |
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| 203 | * @setter: a #GstTagSetter |
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| 204 | * @mode: the mode to use |
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| 205 | * @tag: tag to set |
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| 206 | * @var_args: tag / GValue pairs to set |
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| 207 | * |
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| 208 | * Adds the given tag / GValue pairs on the setter using the given merge mode. |
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| 209 | * The list must be terminated with GST_TAG_INVALID. |
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| 210 | */ |
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| 211 | void |
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| 212 | gst_tag_setter_add_valist_values (GstTagSetter * setter, GstTagMergeMode mode, |
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| 213 | const gchar * tag, va_list var_args) |
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| 214 | { |
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| 215 | GstTagData *data; |
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| 216 | |
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| 217 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 218 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 219 | |
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| 220 | data = gst_tag_setter_get_data (setter); |
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| 221 | if (!data->list) |
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| 222 | data->list = gst_tag_list_new (); |
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| 223 | |
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| 224 | gst_tag_list_add_valist_values (data->list, mode, tag, var_args); |
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| 225 | } |
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| 226 | |
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| 227 | /** |
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| 228 | * gst_tag_setter_get_list: |
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| 229 | * @setter: a #GstTagSetter |
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| 230 | * |
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| 231 | * Retrieves a copy of the current list of tags the setter uses. |
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| 232 | * You need to gst_tag_list_free() the list after use. |
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| 233 | * |
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| 234 | * Returns: a current snapshot of the taglist used in the setter |
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| 235 | * or NULL if none is used. |
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| 236 | */ |
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| 237 | const GstTagList * |
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| 238 | gst_tag_setter_get_list (GstTagSetter * setter) |
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| 239 | { |
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| 240 | g_return_val_if_fail (GST_IS_TAG_SETTER (setter), NULL); |
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| 241 | |
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| 242 | return gst_tag_setter_get_data (setter)->list; |
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| 243 | } |
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| 244 | |
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| 245 | /** |
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| 246 | * gst_tag_setter_set_merge_mode: |
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| 247 | * @setter: a #GstTagSetter |
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| 248 | * @mode: The mode with which tags are added |
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| 249 | * |
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| 250 | * Sets the given merge mode that is used for adding tags from events to tags |
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| 251 | * specified by this interface. The default is #GST_TAG_MERGE_KEEP, which keeps |
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| 252 | * the tags by this interface and discards tags from events. |
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| 253 | */ |
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| 254 | void |
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| 255 | gst_tag_setter_set_merge_mode (GstTagSetter * setter, GstTagMergeMode mode) |
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| 256 | { |
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| 257 | g_return_if_fail (GST_IS_TAG_SETTER (setter)); |
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| 258 | g_return_if_fail (GST_TAG_MODE_IS_VALID (mode)); |
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| 259 | |
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| 260 | gst_tag_setter_get_data (setter)->mode = mode; |
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| 261 | } |
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| 262 | |
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| 263 | /** |
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| 264 | * gst_tag_setter_get_merge_mode: |
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| 265 | * @setter: a #GstTagSetter |
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| 266 | * |
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| 267 | * Queries the mode by which tags inside the setter are overwritten by tags |
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| 268 | * from events |
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| 269 | * |
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| 270 | * Returns: the merge mode used inside the element. |
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| 271 | */ |
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| 272 | GstTagMergeMode |
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| 273 | gst_tag_setter_get_merge_mode (GstTagSetter * setter) |
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| 274 | { |
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| 275 | g_return_val_if_fail (GST_IS_TAG_SETTER (setter), FALSE); |
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| 276 | |
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| 277 | return gst_tag_setter_get_data (setter)->mode; |
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| 278 | } |
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