2011-07-15 12:07:55 +00:00
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/* GStreamer media licenses utility functions
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* Copyright (C) 2011 Tim-Philipp Müller <tim centricular net>
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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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2012-11-03 23:05:09 +00:00
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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2011-07-15 12:07:55 +00:00
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*/
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/**
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* SECTION:gsttaglicenses
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2017-01-23 19:36:11 +00:00
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* @title: Licenses
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2011-07-15 12:07:55 +00:00
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* @short_description: utility functions for Creative Commons licenses
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* @see_also: #GstTagList
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*
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* Provides information about Creative Commons media licenses, which are
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* often expressed in media files as a license URI in tags. Also useful
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* for applications creating media files, in case the user wants to license
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* the content under a Creative Commons license.
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*/
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/* FIXME: add API to check obsolete-ness / replace-by */
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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/gst.h>
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#include <string.h>
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#include <stdlib.h>
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#include "tag.h"
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#include "licenses-tables.dat"
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#ifndef GST_DISABLE_GST_DEBUG
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#define GST_CAT_DEFAULT ensure_debug_category()
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static GstDebugCategory *
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ensure_debug_category (void)
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{
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static gsize cat_gonce = 0;
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if (g_once_init_enter (&cat_gonce)) {
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gsize cat_done;
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cat_done = (gsize) _gst_debug_category_new ("tag-licenses", 0,
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"GstTag licenses");
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g_once_init_leave (&cat_gonce, cat_done);
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}
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return (GstDebugCategory *) cat_gonce;
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}
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#else
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#define ensure_debug_category() /* NOOP */
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#endif /* GST_DISABLE_GST_DEBUG */
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/* -------------------------------------------------------------------------
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* Translations
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* ------------------------------------------------------------------------- */
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#ifdef ENABLE_NLS
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static GVariant *
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gst_tag_get_license_translations_dictionary (void)
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{
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static gsize var_gonce = 0;
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if (g_once_init_enter (&var_gonce)) {
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const gchar *dict_path;
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GVariant *var = NULL;
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GError *err = NULL;
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gchar *data;
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gsize len;
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/* for gst-uninstalled */
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dict_path = g_getenv ("GST_TAG_LICENSE_TRANSLATIONS_DICT");
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if (dict_path == NULL)
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dict_path = LICENSE_TRANSLATIONS_PATH;
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GST_INFO ("Loading license translations from '%s'", dict_path);
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if (g_file_get_contents (dict_path, &data, &len, &err)) {
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var = g_variant_new_from_data (G_VARIANT_TYPE ("a{sa{ss}}"), data, len,
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TRUE, (GDestroyNotify) g_free, data);
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} else {
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GST_WARNING ("Could not load translation dictionary %s", err->message);
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g_error_free (err);
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var = g_variant_new_array (G_VARIANT_TYPE ("{sa{ss}}"), NULL, 0);
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}
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g_once_init_leave (&var_gonce, (gsize) var);
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}
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return (GVariant *) var_gonce;
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}
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#endif
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#ifdef ENABLE_NLS
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static gboolean
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gst_variant_lookup_string_value (GVariant * dict, const gchar * lang,
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const gchar ** translation)
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{
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GVariant *trans;
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trans = g_variant_lookup_value (dict, lang, G_VARIANT_TYPE ("s"));
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if (trans == NULL)
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return FALSE;
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*translation = g_variant_get_string (trans, NULL);
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/* string will stay valid */
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g_variant_unref (trans);
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GST_TRACE ("Result: '%s' for language '%s'", *translation, lang);
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return TRUE;
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}
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#endif
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static const gchar *
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gst_license_str_translate (const gchar * s)
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{
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#ifdef ENABLE_NLS
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GVariant *v, *dict, *trans;
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v = gst_tag_get_license_translations_dictionary ();
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g_assert (v != NULL);
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dict = g_variant_lookup_value (v, s, G_VARIANT_TYPE ("a{ss}"));
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if (dict != NULL) {
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const gchar *const *lang;
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const gchar *env_lang;
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/* for unit tests */
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if ((env_lang = g_getenv ("GST_TAG_LICENSE_TRANSLATIONS_LANG"))) {
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if (gst_variant_lookup_string_value (dict, env_lang, &s))
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GST_TRACE ("Result: '%s' for forced language '%s'", s, env_lang);
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goto beach;
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}
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lang = g_get_language_names ();
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while (lang != NULL && *lang != NULL) {
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GST_TRACE ("Looking up '%s' for language '%s'", s, *lang);
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trans = g_variant_lookup_value (dict, *lang, G_VARIANT_TYPE ("s"));
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if (trans != NULL) {
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s = g_variant_get_string (trans, NULL);
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/* s will stay valid */
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g_variant_unref (trans);
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GST_TRACE ("Result: '%s'", s);
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break;
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}
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GST_TRACE ("No result for '%s' for language '%s'", s, *lang);
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++lang;
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}
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beach:
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g_variant_unref (dict);
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} else {
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GST_WARNING ("No dict for string '%s'", s);
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}
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#endif
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return s;
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}
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/* -------------------------------------------------------------------------
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* License handling
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* ------------------------------------------------------------------------- */
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#define CC_LICENSE_REF_PREFIX "http://creativecommons.org/licenses/"
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/* is this license 'generic' (and a base for any of the supported
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* jurisdictions), or jurisdiction-specific only? */
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#define JURISDICTION_GENERIC (G_GUINT64_CONSTANT (1) << 63)
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static const gchar jurisdictions[] =
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"ar\000at\000au\000be\000bg\000br\000ca\000ch\000cl\000cn\000co\000de\000"
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"dk\000es\000fi\000fr\000hr\000hu\000il\000in\000it\000jp\000kr\000mk\000"
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"mt\000mx\000my\000nl\000pe\000pl\000pt\000scotland\000se\000si\000tw\000"
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"uk\000us\000za";
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/**
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* gst_tag_get_licenses:
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*
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* Returns a list of known license references (in form of URIs). This is
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* useful for UIs to build a list of available licenses for tagging purposes
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* (e.g. to tag an audio track appropriately in a video or audio editor, or
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* an image in a camera application).
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*
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2012-04-29 16:16:38 +00:00
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* Returns: (transfer full): NULL-terminated array of license strings. Free
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* with g_strfreev() when no longer needed.
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2011-07-15 12:07:55 +00:00
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*/
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gchar **
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gst_tag_get_licenses (void)
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{
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GPtrArray *arr;
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int i;
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arr = g_ptr_array_new ();
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for (i = 0; i < G_N_ELEMENTS (licenses); ++i) {
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const gchar *jurs;
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gboolean is_generic;
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guint64 jbits;
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gchar *ref;
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jbits = licenses[i].jurisdictions;
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is_generic = (jbits & JURISDICTION_GENERIC) != 0;
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if (is_generic) {
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ref = g_strconcat (CC_LICENSE_REF_PREFIX, licenses[i].ref, NULL);
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GST_LOG ("Adding %2d %s (generic)", i, ref);
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g_ptr_array_add (arr, ref);
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jbits &= ~JURISDICTION_GENERIC;
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}
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jurs = jurisdictions;
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while (jbits != 0) {
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if ((jbits & 1)) {
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ref = g_strconcat (CC_LICENSE_REF_PREFIX, licenses[i].ref, jurs, "/",
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NULL);
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GST_LOG ("Adding %2d %s (%s: %s)", i, ref,
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(is_generic) ? "derived" : "specific", jurs);
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g_ptr_array_add (arr, ref);
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}
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g_assert (jurs < (jurisdictions + sizeof (jurisdictions)));
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jurs += strlen (jurs) + 1;
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jbits >>= 1;
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}
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}
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g_ptr_array_add (arr, NULL);
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return (gchar **) g_ptr_array_free (arr, FALSE);
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}
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static gint
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gst_tag_get_license_idx (const gchar * license_ref, const gchar ** jurisdiction)
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{
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const gchar *ref, *jur_suffix;
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int i;
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GST_TRACE ("Looking up '%s'", license_ref);
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if (!g_str_has_prefix (license_ref, CC_LICENSE_REF_PREFIX)) {
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GST_WARNING ("unknown license prefix in ref '%s'", license_ref);
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return -1;
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}
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if (jurisdiction != NULL)
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*jurisdiction = NULL;
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ref = license_ref + sizeof (CC_LICENSE_REF_PREFIX) - 1;
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for (i = 0; i < G_N_ELEMENTS (licenses); ++i) {
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guint64 jbits = licenses[i].jurisdictions;
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const gchar *jurs, *lref = licenses[i].ref;
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gsize lref_len = strlen (lref);
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/* table should have "foo/bar/" with trailing slash */
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g_assert (lref[lref_len - 1] == '/');
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if ((jbits & JURISDICTION_GENERIC)) {
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GST_TRACE ("[%2d] %s checking generic match", i, licenses[i].ref);
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/* exact match? */
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if (strcmp (ref, lref) == 0)
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return i;
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/* exact match but without the trailing slash in ref? */
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if (strncmp (ref, lref, lref_len - 1) == 0 && ref[lref_len - 1] == '\0')
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return i;
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}
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if (!g_str_has_prefix (ref, lref))
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continue;
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GST_TRACE ("[%2d] %s checking jurisdictions", i, licenses[i].ref);
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jbits &= ~JURISDICTION_GENERIC;
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jur_suffix = ref + lref_len;
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if (*jur_suffix == '\0')
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continue;
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jurs = jurisdictions;
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while (jbits != 0) {
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guint jur_len = strlen (jurs);
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if ((jbits & 1)) {
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if (strncmp (jur_suffix, jurs, jur_len) == 0 &&
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(jur_suffix[jur_len] == '\0' || jur_suffix[jur_len] == '/')) {
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GST_LOG ("matched %s to %s with jurisdiction %s (idx %d)",
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license_ref, licenses[i].ref, jurs, i);
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if (jurisdiction != NULL)
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*jurisdiction = jurs;
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return i;
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}
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}
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g_assert (jurs < (jurisdictions + sizeof (jurisdictions)));
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jurs += jur_len + 1;
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jbits >>= 1;
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}
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}
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GST_WARNING ("unhandled license ref '%s'", license_ref);
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return -1;
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}
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/**
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* gst_tag_get_license_flags:
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* @license_ref: a license reference string in form of a URI,
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* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
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*
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* Get the flags of a license, which describe most of the features of
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* a license in their most general form.
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*
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* Returns: the flags of the license, or 0 if the license is unknown
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*/
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GstTagLicenseFlags
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gst_tag_get_license_flags (const gchar * license_ref)
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{
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int idx;
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g_return_val_if_fail (license_ref != NULL, 0);
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idx = gst_tag_get_license_idx (license_ref, NULL);
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return (idx < 0) ? 0 : licenses[idx].flags;
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}
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/**
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* gst_tag_get_license_nick:
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* @license_ref: a license reference string in form of a URI,
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* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
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*
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* Get the nick name of a license, which is a short (untranslated) string
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* such as e.g. "CC BY-NC-ND 2.0 UK".
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*
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* Returns: the nick name of the license, or NULL if the license is unknown
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*/
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const gchar *
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gst_tag_get_license_nick (const gchar * license_ref)
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{
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GstTagLicenseFlags flags;
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const gchar *creator_prefix, *res;
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gchar *nick, *c;
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g_return_val_if_fail (license_ref != NULL, NULL);
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flags = gst_tag_get_license_flags (license_ref);
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if ((flags & GST_TAG_LICENSE_CREATIVE_COMMONS_LICENSE)) {
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creator_prefix = "CC ";
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} else if ((flags & GST_TAG_LICENSE_FREE_SOFTWARE_FOUNDATION_LICENSE)) {
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creator_prefix = "FSF ";
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} else if (g_str_has_suffix (license_ref, "publicdomain/")) {
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creator_prefix = "";
|
|
|
|
} else {
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
nick = g_strdup_printf ("%s%s", creator_prefix,
|
|
|
|
license_ref + sizeof (CC_LICENSE_REF_PREFIX) - 1);
|
|
|
|
g_strdelimit (nick, "/", ' ');
|
|
|
|
g_strchomp (nick);
|
|
|
|
for (c = nick; *c != '\0'; ++c)
|
|
|
|
*c = g_ascii_toupper (*c);
|
|
|
|
|
|
|
|
GST_LOG ("%s => nick %s", license_ref, nick);
|
|
|
|
res = g_intern_string (nick); /* for convenience */
|
|
|
|
g_free (nick);
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_tag_get_license_title:
|
|
|
|
* @license_ref: a license reference string in form of a URI,
|
|
|
|
* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
|
|
|
|
*
|
|
|
|
* Get the title of a license, which is a short translated description
|
|
|
|
* of the license's features (generally not very pretty though).
|
|
|
|
*
|
|
|
|
* Returns: the title of the license, or NULL if the license is unknown or
|
|
|
|
* no title is available.
|
|
|
|
*/
|
|
|
|
const gchar *
|
|
|
|
gst_tag_get_license_title (const gchar * license_ref)
|
|
|
|
{
|
|
|
|
int idx;
|
|
|
|
|
|
|
|
g_return_val_if_fail (license_ref != NULL, NULL);
|
|
|
|
|
|
|
|
idx = gst_tag_get_license_idx (license_ref, NULL);
|
|
|
|
|
|
|
|
if (idx < 0 || licenses[idx].title_idx < 0)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return gst_license_str_translate (&license_strings[licenses[idx].title_idx]);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_tag_get_license_description:
|
|
|
|
* @license_ref: a license reference string in form of a URI,
|
|
|
|
* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
|
|
|
|
*
|
|
|
|
* Get the description of a license, which is a translated description
|
|
|
|
* of the license's main features.
|
|
|
|
*
|
|
|
|
* Returns: the description of the license, or NULL if the license is unknown
|
|
|
|
* or a description is not available.
|
|
|
|
*/
|
|
|
|
const gchar *
|
|
|
|
gst_tag_get_license_description (const gchar * license_ref)
|
|
|
|
{
|
|
|
|
int idx;
|
|
|
|
|
|
|
|
g_return_val_if_fail (license_ref != NULL, NULL);
|
|
|
|
|
|
|
|
idx = gst_tag_get_license_idx (license_ref, NULL);
|
|
|
|
|
|
|
|
if (idx < 0 || licenses[idx].desc_idx < 0)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return gst_license_str_translate (&license_strings[licenses[idx].desc_idx]);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_tag_get_license_jurisdiction:
|
|
|
|
* @license_ref: a license reference string in form of a URI,
|
|
|
|
* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
|
|
|
|
*
|
|
|
|
* Get the jurisdiction code of a license. This is usually a two-letter
|
|
|
|
* ISO 3166-1 alpha-2 code, but there is also the special case of Scotland,
|
|
|
|
* for which no code exists and which is thus represented as "scotland".
|
|
|
|
*
|
|
|
|
* Known jurisdictions: ar, at, au, be, bg, br, ca, ch, cl, cn, co, de,
|
|
|
|
* dk, es, fi, fr, hr, hu, il, in, it, jp, kr, mk, mt, mx, my, nl, pe, pl,
|
|
|
|
* pt, scotland, se, si, tw, uk, us, za.
|
|
|
|
*
|
|
|
|
* Returns: the jurisdiction code of the license, or NULL if the license is
|
|
|
|
* unknown or is not specific to a particular jurisdiction.
|
|
|
|
*/
|
|
|
|
const gchar *
|
|
|
|
gst_tag_get_license_jurisdiction (const gchar * license_ref)
|
|
|
|
{
|
|
|
|
const gchar *jurisdiction;
|
|
|
|
int idx;
|
|
|
|
|
|
|
|
g_return_val_if_fail (license_ref != NULL, NULL);
|
|
|
|
|
|
|
|
idx = gst_tag_get_license_idx (license_ref, &jurisdiction);
|
|
|
|
return (idx < 0) ? NULL : jurisdiction;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* gst_tag_get_license_version:
|
|
|
|
* @license_ref: a license reference string in form of a URI,
|
|
|
|
* e.g. "http://creativecommons.org/licenses/by-nc-nd/2.0/"
|
|
|
|
*
|
|
|
|
* Get the version of a license.
|
|
|
|
*
|
|
|
|
* Returns: the version of the license, or NULL if the license is not known or
|
|
|
|
* has no version
|
|
|
|
*/
|
|
|
|
const gchar *
|
|
|
|
gst_tag_get_license_version (const gchar * license_ref)
|
|
|
|
{
|
|
|
|
int idx;
|
|
|
|
|
|
|
|
g_return_val_if_fail (license_ref != NULL, NULL);
|
|
|
|
|
|
|
|
idx = gst_tag_get_license_idx (license_ref, NULL);
|
|
|
|
if (idx < 0)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
#define LICENSE_FLAG_CC_OR_FSF \
|
|
|
|
(GST_TAG_LICENSE_CREATIVE_COMMONS_LICENSE|\
|
|
|
|
GST_TAG_LICENSE_FREE_SOFTWARE_FOUNDATION_LICENSE)
|
|
|
|
|
|
|
|
/* e.g. publicdomain isn't versioned */
|
|
|
|
if (!(licenses[idx].flags & LICENSE_FLAG_CC_OR_FSF))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
/* KISS for now... */
|
|
|
|
if (strstr (licenses[idx].ref, "/1.0/"))
|
|
|
|
return "1.0";
|
|
|
|
else if (strstr (licenses[idx].ref, "/2.0/"))
|
|
|
|
return "2.0";
|
|
|
|
else if (strstr (licenses[idx].ref, "/2.1/"))
|
|
|
|
return "2.1";
|
|
|
|
else if (strstr (licenses[idx].ref, "/2.5/"))
|
|
|
|
return "2.5";
|
|
|
|
else if (strstr (licenses[idx].ref, "/3.0/"))
|
|
|
|
return "3.0";
|
|
|
|
|
|
|
|
GST_ERROR ("Could not determine version for ref '%s'", license_ref);
|
|
|
|
return NULL;
|
|
|
|
}
|