--- /dev/null
+/* GStreamer language codes and names utility functions
+ * Copyright (C) 2009 Tim-Philipp Müller <tim centricular net>
+ *
+ * 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:gsttaglanguagecodes
+ * @short_description: mappings for ISO-639 language codes and names
+ * @see_also: #GstTagList
+ *
+ * <refsect2>
+ * <para>
+ * Provides helper functions to convert between the various ISO-639 language
+ * codes, and to map language codes to language names.
+ * </para>
+ * </refsect2>
+ */
+
+/* FIXME 0.11: maybe switch to ISO-639-2 everywhere incl. GST_TAG_LANGUAGE? */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#undef GETTEXT_PACKAGE
+#define GETTEXT_PACKAGE "iso_639"
+
+#define ISO_639_XML_PATH ISO_CODES_PREFIX "/share/xml/iso-codes/iso_639.xml"
+#define ISO_CODES_LOCALEDIR ISO_CODES_PREFIX "/share/locale"
+
+#include <gst/gst-i18n-plugin.h>
+#include <gst/gst.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "tag.h"
+#include "lang-tables.dat"
+
+#ifndef GST_DISABLE_GST_DEBUG
+
+#define GST_CAT_DEFAULT ensure_debug_category()
+
+static GstDebugCategory *
+ensure_debug_category (void)
+{
+ static gsize cat_gonce = 0;
+
+ if (g_once_init_enter (&cat_gonce)) {
+ gsize cat_done;
+
+ cat_done = (gsize) _gst_debug_category_new ("tag-langcodes", 0,
+ "GstTag language codes and names");
+
+ g_once_init_leave (&cat_gonce, cat_done);
+ }
+
+ return (GstDebugCategory *) cat_gonce;
+}
+
+#else
+
+#define ensure_debug_category() /* NOOP */
+
+#endif /* GST_DISABLE_GST_DEBUG */
+
+/* ------------------------------------------------------------------------- */
+
+/* Loading and initing */
+
+#if defined(HAVE_ISO_CODES)
+static const gchar *
+get_val (const gchar ** names, const gchar ** vals, const gchar * name)
+{
+ while (names != NULL && *names != NULL) {
+ if (strcmp (*names, name) == 0)
+ return *vals;
+ ++names;
+ ++vals;
+ }
+ return NULL;
+}
+
+static void
+parse_start_element (GMarkupParseContext * ctx, const gchar * element_name,
+ const gchar ** attr_names, const gchar ** attr_vals,
+ gpointer user_data, GError ** error)
+{
+ GHashTable *ht = (GHashTable *) user_data;
+ const gchar *c1, *c2t, *c2b, *name, *tname;
+
+ if (strcmp (element_name, "iso_639_entry") != 0)
+ return;
+
+ c1 = get_val (attr_names, attr_vals, "iso_639_1_code");
+
+ /* only interested in languages with an ISO 639-1 code for now */
+ if (c1 == NULL)
+ return;
+
+ c2t = get_val (attr_names, attr_vals, "iso_639_2T_code");
+ c2b = get_val (attr_names, attr_vals, "iso_639_2B_code");
+ name = get_val (attr_names, attr_vals, "name");
+
+ if (c2t == NULL || c2b == NULL || name == NULL) {
+ GST_WARNING ("broken iso_639.xml entry: c2t=%p, c2b=%p, name=%p", c2t,
+ c2b, name);
+ return;
+ }
+
+ /* translate language name */
+ tname = _(name);
+
+ /* if no translation was found, it will return the input string, which we
+ * we don't want to put into the hash table because it will be freed again */
+ if (G_UNLIKELY (tname == name))
+ tname = g_intern_string (name);
+
+ /* now overwrite default/fallback mappings with names in locale language */
+ g_hash_table_replace (ht, (gpointer) g_intern_string (c1), (gpointer) tname);
+ g_hash_table_replace (ht, (gpointer) g_intern_string (c2b), (gpointer) tname);
+ if (strcmp (c2t, c2b) != 0) {
+ g_hash_table_replace (ht, (gpointer) g_intern_string (c2t),
+ (gpointer) tname);
+ }
+
+ GST_LOG ("%s %s %s : %s - %s", c1, c2t, c2b, name, tname);
+}
+
+static void
+gst_tag_load_iso_639_xml (GHashTable * ht)
+{
+ GMappedFile *f;
+ GError *err = NULL;
+ gchar *xml_data;
+ gsize xml_len;
+
+#ifdef ENABLE_NLS
+ GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
+ ISO_CODES_LOCALEDIR);
+ bindtextdomain (GETTEXT_PACKAGE, ISO_CODES_LOCALEDIR);
+ bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+#endif
+
+ f = g_mapped_file_new (ISO_639_XML_PATH, FALSE, NULL);
+ if (f != NULL) {
+ xml_data = (gchar *) g_mapped_file_get_contents (f);
+ xml_len = g_mapped_file_get_length (f);
+ } else {
+ if (!g_file_get_contents (ISO_639_XML_PATH, &xml_data, &xml_len, &err)) {
+ GST_WARNING ("Could not read %s: %s", ISO_639_XML_PATH, err->message);
+ g_error_free (err);
+ return;
+ }
+ }
+
+ if (g_utf8_validate (xml_data, xml_len, NULL)) {
+ GMarkupParser xml_parser = { parse_start_element, NULL, NULL, NULL, NULL };
+ GMarkupParseContext *ctx;
+
+ ctx = g_markup_parse_context_new (&xml_parser, 0, ht, NULL);
+ if (!g_markup_parse_context_parse (ctx, xml_data, xml_len, &err)) {
+ GST_WARNING ("Parsing iso_639.xml failed: %s", err->message);
+ g_error_free (err);
+ }
+ g_markup_parse_context_free (ctx);
+ } else {
+ GST_WARNING ("iso_639.xml file is not valid UTF-8");
+ GST_MEMDUMP ("iso_639.xml file", (guint8 *) xml_data, xml_len);
+ }
+
+ /* ... and clean up */
+ if (f != NULL)
+ g_mapped_file_unref (f);
+ else
+ g_free (xml_data);
+}
+#endif /* HAVE_ISO_CODES */
+
+static GHashTable *
+gst_tag_get_iso_639_ht (void)
+{
+ static gsize once_val = 0;
+ int i;
+
+ if (g_once_init_enter (&once_val)) {
+ GHashTable *ht;
+ gsize done_val;
+
+ GST_MEMDUMP ("iso 639 language names (internal default/fallback)",
+ (guint8 *) iso_639_names, sizeof (iso_639_names));
+
+ /* maps code -> language name; all strings are either interned strings
+ * or const static strings from lang-table.c */
+ ht = g_hash_table_new (g_str_hash, g_str_equal);
+
+ /* set up default/fallback mappings */
+ for (i = 0; i < G_N_ELEMENTS (iso_639_codes); ++i) {
+ GST_LOG ("%3d %s %s %c%c 0x%04x %s", i, iso_639_codes[i].iso_639_1,
+ iso_639_codes[i].iso_639_2,
+ ((iso_639_codes[i].flags & ISO_639_FLAG_2B)) ? 'B' : '.',
+ ((iso_639_codes[i].flags & ISO_639_FLAG_2T)) ? 'T' : '.',
+ iso_639_codes[i].name_offset,
+ iso_639_names + iso_639_codes[i].name_offset);
+
+#ifdef HAVE_ISO_CODES
+ /* intern these in order to minimise allocations when interning strings
+ * read from the xml file later */
+ g_intern_static_string (iso_639_codes[i].iso_639_1);
+ g_intern_static_string (iso_639_codes[i].iso_639_2);
+ g_intern_static_string (iso_639_names + iso_639_codes[i].name_offset);
+#endif
+
+ /* and add default mapping (these strings are always valid) */
+ g_hash_table_insert (ht, (gpointer) iso_639_codes[i].iso_639_1,
+ (gpointer) (iso_639_names + iso_639_codes[i].name_offset));
+ g_hash_table_insert (ht, (gpointer) iso_639_codes[i].iso_639_2,
+ (gpointer) (iso_639_names + iso_639_codes[i].name_offset));
+ }
+
+#ifdef HAVE_ISO_CODES
+ {
+ GstClockTime ts = gst_util_get_timestamp ();
+
+ gst_tag_load_iso_639_xml (ht);
+
+ ts = gst_util_get_timestamp () - ts;
+ GST_INFO ("iso_639.xml loading took %.2gms", (double) ts / GST_MSECOND);
+ }
+#else
+ GST_INFO ("iso-codes disabled or not available");
+#endif
+
+ done_val = (gsize) ht;
+ g_once_init_leave (&once_val, done_val);
+ }
+
+ return (GHashTable *) once_val;
+}
+
+/* ------------------------------------------------------------------------- */
+
+static int
+qsort_strcmp_func (const void *p1, const void *p2)
+{
+ return strcmp (*(char *const *) p1, *(char *const *) p2);
+}
+
+/**
+ * gst_tag_get_language_codes:
+ *
+ * Returns a list of known language codes (in form of two-letter ISO-639-1
+ * codes). This is useful for UIs to build a list of available languages for
+ * tagging purposes (e.g. to tag an audio track appropriately in a video or
+ * audio editor).
+ *
+ * Returns: NULL-terminated string array with two-letter language codes. Free
+ * with g_strfreev() when no longer needed.
+ *
+ * Since: 0.10.26
+ */
+gchar **
+gst_tag_get_language_codes (void)
+{
+ GHashTableIter iter;
+ GHashTable *ht;
+ gpointer key;
+ gchar **codes;
+ int i;
+
+ ensure_debug_category ();
+
+ ht = gst_tag_get_iso_639_ht ();
+
+ /* we have at least two keys for each language (-1 code and -2 code) */
+ codes = g_new (gchar *, (g_hash_table_size (ht) / 2) + 1);
+
+ i = 0;
+ g_hash_table_iter_init (&iter, ht);
+ while (g_hash_table_iter_next (&iter, &key, NULL)) {
+ const gchar *lang_code = key;
+
+ if (strlen (lang_code) == 2) {
+ codes[i] = g_strdup (lang_code);
+ ++i;
+ }
+ }
+ codes[i] = NULL;
+
+ /* be nice and sort the list */
+ qsort (&codes[0], i, sizeof (gchar *), qsort_strcmp_func);
+
+ return codes;
+}
+
+/**
+ * gst_tag_get_language_name:
+ * @language_code: two or three-letter ISO-639 language code
+ *
+ * Returns the name of the language given an ISO-639 language code, such
+ * as often found in a GST_TAG_LANGUAGE tag. The name will be translated
+ * according to the current locale (if the library was built against the
+ * iso-codes package, otherwise the English name will be returned).
+ *
+ * Language codes are case-sensitive and expected to be lower case.
+ *
+ * Returns: language name in UTF-8 format, or NULL if @language_code could
+ * not be mapped to a language name. The returned string must not be
+ * modified and does not need to freed; it will stay valid until the
+ * application is terminated.
+ *
+ * Since: 0.10.26
+ */
+const gchar *
+gst_tag_get_language_name (const gchar * language_code)
+{
+ const gchar *lang_name;
+ GHashTable *ht;
+
+ g_return_val_if_fail (language_code != NULL, NULL);
+
+ ensure_debug_category ();
+
+ ht = gst_tag_get_iso_639_ht ();
+
+ lang_name = g_hash_table_lookup (ht, (gpointer) language_code);
+ GST_LOG ("%s -> %s", language_code, GST_STR_NULL (lang_name));
+
+ return lang_name;
+}
+
+/**
+ * gst_tag_get_language_code_iso_639_1:
+ * @lang_code: ISO-639 language code (e.g. "deu" or "ger" or "de")
+ *
+ * Returns two-letter ISO-639-1 language code given a three-letter ISO-639-2
+ * language code or two-letter ISO-639-1 language code (both are accepted for
+ * convenience).
+ *
+ * Language codes are case-sensitive and expected to be lower case.
+ *
+ * Returns: two-letter ISO-639-1 language code string that maps to @lang_code,
+ * or NULL if no mapping is known. The returned string must not be
+ * modified or freed.
+ *
+ * Since: 0.10.26
+ */
+const gchar *
+gst_tag_get_language_code_iso_639_1 (const gchar * lang_code)
+{
+ const gchar *c = NULL;
+ int i;
+
+ g_return_val_if_fail (lang_code != NULL, NULL);
+
+ ensure_debug_category ();
+
+ /* FIXME: we are being a bit inconsistent here in the sense that will only
+ * map the language codes from our static table. Theoretically the iso-codes
+ * XML file might have had additional codes that are now in the hash table.
+ * We keep it simple for now and don't waste memory on additional tables. */
+ for (i = 0; i < G_N_ELEMENTS (iso_639_codes); ++i) {
+ /* we check both codes here, so function can be used in a more versatile
+ * way, to convert a language tag to a two-letter language code and/or
+ * verify an existing code */
+ if (strcmp (lang_code, iso_639_codes[i].iso_639_1) == 0 ||
+ strcmp (lang_code, iso_639_codes[i].iso_639_2) == 0) {
+ c = iso_639_codes[i].iso_639_1;
+ break;
+ }
+ }
+
+ GST_LOG ("%s -> %s", lang_code, GST_STR_NULL (c));
+
+ return c;
+}
+
+static const gchar *
+gst_tag_get_language_code_iso_639_2X (const gchar * lang_code, guint8 flags)
+{
+ int i;
+
+ /* FIXME: we are being a bit inconsistent here in the sense that we will only
+ * map the language codes from our static table. Theoretically the iso-codes
+ * XML file might have had additional codes that are now in the hash table.
+ * We keep it simple for now and don't waste memory on additional tables.
+ * Also, we currently only parse the iso_639.xml file if language names or
+ * a list of all codes is requested, and it'd be nice to keep it like that. */
+ for (i = 0; i < G_N_ELEMENTS (iso_639_codes); ++i) {
+ /* we check both codes here, so function can be used in a more versatile
+ * way, to convert a language tag to a three-letter language code and/or
+ * verify an existing code */
+ if (strcmp (lang_code, iso_639_codes[i].iso_639_1) == 0 ||
+ strcmp (lang_code, iso_639_codes[i].iso_639_2) == 0) {
+ if ((iso_639_codes[i].flags & flags) == flags) {
+ return iso_639_codes[i].iso_639_2;
+ } else if (i > 0 && (iso_639_codes[i - 1].flags & flags) == flags &&
+ iso_639_codes[i].name_offset == iso_639_codes[i - 1].name_offset) {
+ return iso_639_codes[i - 1].iso_639_2;
+ } else if (i < G_N_ELEMENTS (iso_639_codes) &&
+ (iso_639_codes[i + 1].flags & flags) == flags &&
+ iso_639_codes[i].name_offset == iso_639_codes[i + 1].name_offset) {
+ return iso_639_codes[i + 1].iso_639_2;
+ }
+ }
+ }
+ return NULL;
+}
+
+/**
+ * gst_tag_get_language_code_iso_639_2T:
+ * @lang_code: ISO-639 language code (e.g. "deu" or "ger" or "de")
+ *
+ * Returns three-letter ISO-639-2 "terminological" language code given a
+ * two-letter ISO-639-1 language code or a three-letter ISO-639-2 language
+ * code (both are accepted for convenience).
+ *
+ * The "terminological" code is derived from the local name of the language
+ * (e.g. "deu" for German instead of "ger"). In most scenarios, the
+ * "terminological" codes are prefered over the "bibliographic" ones.
+ *
+ * Language codes are case-sensitive and expected to be lower case.
+ *
+ * Returns: three-letter ISO-639-2 language code string that maps to @lang_code,
+ * or NULL if no mapping is known. The returned string must not be
+ * modified or freed.
+ *
+ * Since: 0.10.26
+ */
+const gchar *
+gst_tag_get_language_code_iso_639_2T (const gchar * lang_code)
+{
+ const gchar *c;
+
+ g_return_val_if_fail (lang_code != NULL, NULL);
+
+ ensure_debug_category ();
+
+ c = gst_tag_get_language_code_iso_639_2X (lang_code, ISO_639_FLAG_2T);
+
+ GST_LOG ("%s -> %s", lang_code, GST_STR_NULL (c));
+
+ return c;
+}
+
+/**
+ * gst_tag_get_language_code_iso_639_2B:
+ * @lang_code: ISO-639 language code (e.g. "deu" or "ger" or "de")
+ *
+ * Returns three-letter ISO-639-2 "bibliographic" language code given a
+ * two-letter ISO-639-1 language code or a three-letter ISO-639-2 language
+ * code (both are accepted for convenience).
+ *
+ * The "bibliographic" code is derived from the English name of the language
+ * (e.g. "ger" for German instead of "de" or "deu"). In most scenarios, the
+ * "terminological" codes are prefered.
+ *
+ * Language codes are case-sensitive and expected to be lower case.
+ *
+ * Returns: three-letter ISO-639-2 language code string that maps to @lang_code,
+ * or NULL if no mapping is known. The returned string must not be
+ * modified or freed.
+ *
+ * Since: 0.10.26
+ */
+const gchar *
+gst_tag_get_language_code_iso_639_2B (const gchar * lang_code)
+{
+ const gchar *c;
+
+ g_return_val_if_fail (lang_code != NULL, NULL);
+
+ ensure_debug_category ();
+
+ c = gst_tag_get_language_code_iso_639_2X (lang_code, ISO_639_FLAG_2B);
+
+ GST_LOG ("%s -> %s", lang_code, GST_STR_NULL (c));
+
+ return c;
+}
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