--- /dev/null
+/* GStreamer
+ * Copyright (C) 2010 Stefan Kost <stefan.kost@nokia.com>
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * gstxmptag.c: library for reading / modifying xmp tags
+ *
+ * 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:gsttagxmp
+ * @short_description: tag mappings and support functions for plugins
+ * dealing with xmp packets
+ * @see_also: #GstTagList
+ *
+ * Contains various utility functions for plugins to parse or create
+ * xmp packets and map them to and from #GstTagList<!-- -->s.
+ *
+ * Please note that the xmp parser is very lightweight and not strict at all.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "tag.h"
+#include <gst/gsttagsetter.h>
+#include "gsttageditingprivate.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <ctype.h>
+
+static const gchar *schema_list[] = {
+ "dc",
+ "xap",
+ "tiff",
+ "exif",
+ "photoshop",
+ "Iptc4xmpCore",
+ NULL
+};
+
+/**
+ * gst_tag_xmp_list_schemas:
+ *
+ * Gets the list of supported schemas in the xmp lib
+ *
+ * Returns: a %NULL terminated array of strings with the schema names
+ *
+ * Since: 0.10.33
+ */
+const gchar **
+gst_tag_xmp_list_schemas (void)
+{
+ return schema_list;
+}
+
+typedef struct _XmpSerializationData XmpSerializationData;
+typedef struct _XmpTag XmpTag;
+
+/*
+ * Serializes a GValue into a string.
+ */
+typedef gchar *(*XmpSerializationFunc) (const GValue * value);
+
+/*
+ * Deserializes @str that is the gstreamer tag @gst_tag represented in
+ * XMP as the @xmp_tag_value and adds the result to the @taglist.
+ *
+ * @pending_tags is passed so that compound xmp tags can search for its
+ * complements on the list and use them. Note that used complements should
+ * be freed and removed from the list.
+ * The list is of PendingXmpTag
+ */
+typedef void (*XmpDeserializationFunc) (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag_value,
+ const gchar * str, GSList ** pending_tags);
+
+struct _XmpSerializationData
+{
+ GString *data;
+ const gchar **schemas;
+};
+
+static gboolean
+xmp_serialization_data_use_schema (XmpSerializationData * serdata,
+ const gchar * schemaname)
+{
+ gint i = 0;
+ if (serdata->schemas == NULL)
+ return TRUE;
+
+ while (serdata->schemas[i] != NULL) {
+ if (strcmp (serdata->schemas[i], schemaname) == 0)
+ return TRUE;
+ i++;
+ }
+ return FALSE;
+}
+
+
+#define GST_XMP_TAG_TYPE_SIMPLE 0
+#define GST_XMP_TAG_TYPE_BAG 1
+#define GST_XMP_TAG_TYPE_SEQ 2
+struct _XmpTag
+{
+ const gchar *tag_name;
+ gint type;
+
+ XmpSerializationFunc serialize;
+ XmpDeserializationFunc deserialize;
+};
+
+static GstTagMergeMode
+xmp_tag_get_merge_mode (XmpTag * xmptag)
+{
+ switch (xmptag->type) {
+ case GST_XMP_TAG_TYPE_BAG:
+ case GST_XMP_TAG_TYPE_SEQ:
+ return GST_TAG_MERGE_APPEND;
+ case GST_XMP_TAG_TYPE_SIMPLE:
+ default:
+ return GST_TAG_MERGE_KEEP;
+ }
+}
+
+static const gchar *
+xmp_tag_get_type_name (XmpTag * xmptag)
+{
+ switch (xmptag->type) {
+ case GST_XMP_TAG_TYPE_SEQ:
+ return "rdf:Seq";
+ default:
+ g_assert_not_reached ();
+ case GST_XMP_TAG_TYPE_BAG:
+ return "rdf:Bag";
+ }
+}
+
+struct _PendingXmpTag
+{
+ const gchar *gst_tag;
+ XmpTag *xmp_tag;
+ gchar *str;
+};
+typedef struct _PendingXmpTag PendingXmpTag;
+
+
+/*
+ * A schema is a mapping of strings (the tag name in gstreamer) to a list of
+ * tags in xmp (XmpTag). We need a list because some tags are split into 2
+ * when serialized into xmp.
+ * e.g. GST_TAG_GEO_LOCATION_ELEVATION needs to be mapped into 2 complementary
+ * tags in the exif's schema. One of them stores the absolute elevation,
+ * and the other one stores if it is above of below sea level.
+ */
+typedef GHashTable GstXmpSchema;
+#define gst_xmp_schema_lookup g_hash_table_lookup
+#define gst_xmp_schema_insert g_hash_table_insert
+static GstXmpSchema *
+gst_xmp_schema_new ()
+{
+ return g_hash_table_new (g_direct_hash, g_direct_equal);
+}
+
+/*
+ * Mappings from schema names into the schema group of tags (GstXmpSchema)
+ */
+static GHashTable *__xmp_schemas;
+
+static void
+_gst_xmp_add_schema (const gchar * name, GstXmpSchema * schema)
+{
+ GQuark key;
+
+ key = g_quark_from_string (name);
+
+ if (g_hash_table_lookup (__xmp_schemas, GUINT_TO_POINTER (key))) {
+ GST_WARNING ("Schema %s already exists, ignoring", name);
+ g_assert_not_reached ();
+ return;
+ }
+
+ g_hash_table_insert (__xmp_schemas, GUINT_TO_POINTER (key), schema);
+}
+
+static void
+_gst_xmp_schema_add_mapping (GstXmpSchema * schema, const gchar * gst_tag,
+ GPtrArray * array)
+{
+ GQuark key;
+
+ key = g_quark_from_string (gst_tag);
+
+ if (gst_xmp_schema_lookup (schema, GUINT_TO_POINTER (key))) {
+ GST_WARNING ("Tag %s already present for the schema", gst_tag);
+ g_assert_not_reached ();
+ return;
+ }
+ gst_xmp_schema_insert (schema, GUINT_TO_POINTER (key), array);
+}
+
+static void
+_gst_xmp_schema_add_simple_mapping (GstXmpSchema * schema,
+ const gchar * gst_tag, const gchar * xmp_tag, gint xmp_type,
+ XmpSerializationFunc serialization_func,
+ XmpDeserializationFunc deserialization_func)
+{
+ XmpTag *xmpinfo;
+ GPtrArray *array;
+
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = xmp_tag;
+ xmpinfo->type = xmp_type;
+ xmpinfo->serialize = serialization_func;
+ xmpinfo->deserialize = deserialization_func;
+
+ array = g_ptr_array_sized_new (1);
+ g_ptr_array_add (array, xmpinfo);
+
+ _gst_xmp_schema_add_mapping (schema, gst_tag, array);
+}
+
+/*
+ * We do not return a copy here because elements are
+ * appended, and the API is not public, so we shouldn't
+ * have our lists modified during usage
+ */
+static GPtrArray *
+_xmp_tag_get_mapping (const gchar * gst_tag, XmpSerializationData * serdata)
+{
+ GPtrArray *ret = NULL;
+ GHashTableIter iter;
+ GQuark key = g_quark_from_string (gst_tag);
+ gpointer iterkey, value;
+ const gchar *schemaname;
+
+ g_hash_table_iter_init (&iter, __xmp_schemas);
+ while (!ret && g_hash_table_iter_next (&iter, &iterkey, &value)) {
+ GstXmpSchema *schema = (GstXmpSchema *) value;
+
+ schemaname = g_quark_to_string (GPOINTER_TO_UINT (iterkey));
+ if (xmp_serialization_data_use_schema (serdata, schemaname))
+ ret =
+ (GPtrArray *) gst_xmp_schema_lookup (schema, GUINT_TO_POINTER (key));
+ }
+ return ret;
+}
+
+/* finds the gst tag that maps to this xmp tag in this schema */
+static const gchar *
+_gst_xmp_schema_get_mapping_reverse (GstXmpSchema * schema,
+ const gchar * xmp_tag, XmpTag ** _xmp_tag)
+{
+ GHashTableIter iter;
+ gpointer key, value;
+ const gchar *ret = NULL;
+ gint index;
+
+ /* Iterate over the hashtable */
+ g_hash_table_iter_init (&iter, schema);
+ while (!ret && g_hash_table_iter_next (&iter, &key, &value)) {
+ GPtrArray *array = (GPtrArray *) value;
+
+ /* each mapping might contain complementary tags */
+ for (index = 0; index < array->len; index++) {
+ XmpTag *xmpinfo = (XmpTag *) g_ptr_array_index (array, index);
+
+ if (strcmp (xmpinfo->tag_name, xmp_tag) == 0) {
+ *_xmp_tag = xmpinfo;
+ ret = g_quark_to_string (GPOINTER_TO_UINT (key));
+ goto out;
+ }
+ }
+ }
+
+out:
+ return ret;
+}
+
+/* finds the gst tag that maps to this xmp tag (searches on all schemas) */
+static const gchar *
+_gst_xmp_tag_get_mapping_reverse (const gchar * xmp_tag, XmpTag ** _xmp_tag)
+{
+ GHashTableIter iter;
+ gpointer key, value;
+ const gchar *ret = NULL;
+
+ /* Iterate over the hashtable */
+ g_hash_table_iter_init (&iter, __xmp_schemas);
+ while (!ret && g_hash_table_iter_next (&iter, &key, &value)) {
+ ret = _gst_xmp_schema_get_mapping_reverse ((GstXmpSchema *) value, xmp_tag,
+ _xmp_tag);
+ }
+ return ret;
+}
+
+/* utility functions/macros */
+
+#define METERS_PER_SECOND_TO_KILOMETERS_PER_HOUR (3.6)
+#define KILOMETERS_PER_HOUR_TO_METERS_PER_SECOND (1/3.6)
+#define MILES_PER_HOUR_TO_METERS_PER_SECOND (0.44704)
+#define KNOTS_TO_METERS_PER_SECOND (0.514444)
+
+static gchar *
+double_to_fraction_string (gdouble num)
+{
+ gint frac_n;
+ gint frac_d;
+
+ gst_util_double_to_fraction (num, &frac_n, &frac_d);
+ return g_strdup_printf ("%d/%d", frac_n, frac_d);
+}
+
+/* (de)serialize functions */
+static gchar *
+serialize_exif_gps_coordinate (const GValue * value, gchar pos, gchar neg)
+{
+ gdouble num;
+ gchar c;
+ gint integer;
+ gchar fraction[G_ASCII_DTOSTR_BUF_SIZE];
+
+ g_return_val_if_fail (G_VALUE_TYPE (value) == G_TYPE_DOUBLE, NULL);
+
+ num = g_value_get_double (value);
+ if (num < 0) {
+ c = neg;
+ num *= -1;
+ } else {
+ c = pos;
+ }
+ integer = (gint) num;
+
+ g_ascii_dtostr (fraction, sizeof (fraction), (num - integer) * 60);
+
+ /* FIXME review GPSCoordinate serialization spec for the .mm or ,ss
+ * decision. Couldn't understand it clearly */
+ return g_strdup_printf ("%d,%s%c", integer, fraction, c);
+}
+
+static gchar *
+serialize_exif_latitude (const GValue * value)
+{
+ return serialize_exif_gps_coordinate (value, 'N', 'S');
+}
+
+static gchar *
+serialize_exif_longitude (const GValue * value)
+{
+ return serialize_exif_gps_coordinate (value, 'E', 'W');
+}
+
+static void
+deserialize_exif_gps_coordinate (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * str, gchar pos, gchar neg)
+{
+ gdouble value = 0;
+ gint d = 0, m = 0, s = 0;
+ gdouble m2 = 0;
+ gchar c = 0;
+ const gchar *current;
+
+ /* get the degrees */
+ if (sscanf (str, "%d", &d) != 1)
+ goto error;
+
+ /* find the beginning of the minutes */
+ current = strchr (str, ',');
+ if (current == NULL)
+ goto end;
+ current += 1;
+
+ /* check if it uses ,SS or .mm */
+ if (strchr (current, ',') != NULL) {
+ sscanf (current, "%d,%d%c", &m, &s, &c);
+ } else {
+ gchar *copy = g_strdup (current);
+ gint len = strlen (copy);
+ gint i;
+
+ /* check the last letter */
+ for (i = len - 1; len >= 0; len--) {
+ if (g_ascii_isspace (copy[i]))
+ continue;
+
+ if (g_ascii_isalpha (copy[i])) {
+ /* found it */
+ c = copy[i];
+ copy[i] = '\0';
+ break;
+
+ } else {
+ /* something is wrong */
+ g_free (copy);
+ goto error;
+ }
+ }
+
+ /* use a copy so we can change the last letter as E can cause
+ * problems here */
+ m2 = g_ascii_strtod (copy, NULL);
+ g_free (copy);
+ }
+
+end:
+ /* we can add them all as those that aren't parsed are 0 */
+ value = d + (m / 60.0) + (s / (60.0 * 60.0)) + (m2 / 60.0);
+
+ if (c == pos) {
+ //NOP
+ } else if (c == neg) {
+ value *= -1;
+ } else {
+ goto error;
+ }
+
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag), gst_tag, value,
+ NULL);
+ return;
+
+error:
+ GST_WARNING ("Failed to deserialize gps coordinate: %s", str);
+}
+
+static void
+deserialize_exif_latitude (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ deserialize_exif_gps_coordinate (xmptag, taglist, gst_tag, str, 'N', 'S');
+}
+
+static void
+deserialize_exif_longitude (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ deserialize_exif_gps_coordinate (xmptag, taglist, gst_tag, str, 'E', 'W');
+}
+
+static gchar *
+serialize_exif_altitude (const GValue * value)
+{
+ gdouble num;
+
+ num = g_value_get_double (value);
+
+ if (num < 0)
+ num *= -1;
+
+ return double_to_fraction_string (num);
+}
+
+static gchar *
+serialize_exif_altituderef (const GValue * value)
+{
+ gdouble num;
+
+ num = g_value_get_double (value);
+
+ /* 0 means above sea level, 1 means below */
+ if (num >= 0)
+ return g_strdup ("0");
+ return g_strdup ("1");
+}
+
+static void
+deserialize_exif_altitude (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ const gchar *altitude_str = NULL;
+ const gchar *altituderef_str = NULL;
+ gint frac_n;
+ gint frac_d;
+ gdouble value;
+
+ GSList *entry;
+ PendingXmpTag *ptag = NULL;
+
+ /* find the other missing part */
+ if (strcmp (xmp_tag, "exif:GPSAltitude") == 0) {
+ altitude_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, "exif:GPSAltitudeRef") == 0) {
+ altituderef_str = ptag->str;
+ break;
+ }
+ }
+
+ } else if (strcmp (xmp_tag, "exif:GPSAltitudeRef") == 0) {
+ altituderef_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, "exif:GPSAltitude") == 0) {
+ altitude_str = ptag->str;
+ break;
+ }
+ }
+
+ } else {
+ GST_WARNING ("Unexpected xmp tag %s", xmp_tag);
+ return;
+ }
+
+ if (!altitude_str) {
+ GST_WARNING ("Missing exif:GPSAltitude tag");
+ return;
+ }
+ if (!altituderef_str) {
+ GST_WARNING ("Missing exif:GPSAltitudeRef tag");
+ return;
+ }
+
+ if (sscanf (altitude_str, "%d/%d", &frac_n, &frac_d) != 2) {
+ GST_WARNING ("Failed to parse fraction: %s", altitude_str);
+ return;
+ }
+
+ gst_util_fraction_to_double (frac_n, frac_d, &value);
+
+ if (altituderef_str[0] == '0') {
+ /* nop */
+ } else if (altituderef_str[0] == '1') {
+ value *= -1;
+ } else {
+ GST_WARNING ("Unexpected exif:AltitudeRef value: %s", altituderef_str);
+ return;
+ }
+
+ /* add to the taglist */
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag),
+ GST_TAG_GEO_LOCATION_ELEVATION, value, NULL);
+
+ /* clean up entry */
+ g_free (ptag->str);
+ g_slice_free (PendingXmpTag, ptag);
+ *pending_tags = g_slist_delete_link (*pending_tags, entry);
+}
+
+static gchar *
+serialize_exif_gps_speed (const GValue * value)
+{
+ return double_to_fraction_string (g_value_get_double (value) *
+ METERS_PER_SECOND_TO_KILOMETERS_PER_HOUR);
+}
+
+static gchar *
+serialize_exif_gps_speedref (const GValue * value)
+{
+ /* we always use km/h */
+ return g_strdup ("K");
+}
+
+static void
+deserialize_exif_gps_speed (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ const gchar *speed_str = NULL;
+ const gchar *speedref_str = NULL;
+ gint frac_n;
+ gint frac_d;
+ gdouble value;
+
+ GSList *entry;
+ PendingXmpTag *ptag = NULL;
+
+ /* find the other missing part */
+ if (strcmp (xmp_tag, "exif:GPSSpeed") == 0) {
+ speed_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, "exif:GPSSpeedRef") == 0) {
+ speedref_str = ptag->str;
+ break;
+ }
+ }
+
+ } else if (strcmp (xmp_tag, "exif:GPSSpeedRef") == 0) {
+ speedref_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, "exif:GPSSpeed") == 0) {
+ speed_str = ptag->str;
+ break;
+ }
+ }
+
+ } else {
+ GST_WARNING ("Unexpected xmp tag %s", xmp_tag);
+ return;
+ }
+
+ if (!speed_str) {
+ GST_WARNING ("Missing exif:GPSSpeed tag");
+ return;
+ }
+ if (!speedref_str) {
+ GST_WARNING ("Missing exif:GPSSpeedRef tag");
+ return;
+ }
+
+ if (sscanf (speed_str, "%d/%d", &frac_n, &frac_d) != 2) {
+ GST_WARNING ("Failed to parse fraction: %s", speed_str);
+ return;
+ }
+
+ gst_util_fraction_to_double (frac_n, frac_d, &value);
+
+ if (speedref_str[0] == 'K') {
+ value *= KILOMETERS_PER_HOUR_TO_METERS_PER_SECOND;
+ } else if (speedref_str[0] == 'M') {
+ value *= MILES_PER_HOUR_TO_METERS_PER_SECOND;
+ } else if (speedref_str[0] == 'N') {
+ value *= KNOTS_TO_METERS_PER_SECOND;
+ } else {
+ GST_WARNING ("Unexpected exif:SpeedRef value: %s", speedref_str);
+ return;
+ }
+
+ /* add to the taglist */
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag),
+ GST_TAG_GEO_LOCATION_MOVEMENT_SPEED, value, NULL);
+
+ /* clean up entry */
+ g_free (ptag->str);
+ g_slice_free (PendingXmpTag, ptag);
+ *pending_tags = g_slist_delete_link (*pending_tags, entry);
+}
+
+static gchar *
+serialize_exif_gps_direction (const GValue * value)
+{
+ return double_to_fraction_string (g_value_get_double (value));
+}
+
+static gchar *
+serialize_exif_gps_directionref (const GValue * value)
+{
+ /* T for true geographic direction (M would mean magnetic) */
+ return g_strdup ("T");
+}
+
+static void
+deserialize_exif_gps_direction (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags, const gchar * direction_tag,
+ const gchar * directionref_tag)
+{
+ const gchar *dir_str = NULL;
+ const gchar *dirref_str = NULL;
+ gint frac_n;
+ gint frac_d;
+ gdouble value;
+
+ GSList *entry;
+ PendingXmpTag *ptag = NULL;
+
+ /* find the other missing part */
+ if (strcmp (xmp_tag, direction_tag) == 0) {
+ dir_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, directionref_tag) == 0) {
+ dirref_str = ptag->str;
+ break;
+ }
+ }
+
+ } else if (strcmp (xmp_tag, directionref_tag) == 0) {
+ dirref_str = str;
+
+ for (entry = *pending_tags; entry; entry = g_slist_next (entry)) {
+ ptag = (PendingXmpTag *) entry->data;
+
+ if (strcmp (ptag->xmp_tag->tag_name, direction_tag) == 0) {
+ dir_str = ptag->str;
+ break;
+ }
+ }
+
+ } else {
+ GST_WARNING ("Unexpected xmp tag %s", xmp_tag);
+ return;
+ }
+
+ if (!dir_str) {
+ GST_WARNING ("Missing %s tag", dir_str);
+ return;
+ }
+ if (!dirref_str) {
+ GST_WARNING ("Missing %s tag", dirref_str);
+ return;
+ }
+
+ if (sscanf (dir_str, "%d/%d", &frac_n, &frac_d) != 2) {
+ GST_WARNING ("Failed to parse fraction: %s", dir_str);
+ return;
+ }
+
+ gst_util_fraction_to_double (frac_n, frac_d, &value);
+
+ if (dirref_str[0] == 'T') {
+ /* nop */
+ } else if (dirref_str[0] == 'M') {
+ GST_WARNING ("Magnetic direction tags aren't supported yet");
+ return;
+ } else {
+ GST_WARNING ("Unexpected %s value: %s", directionref_tag, dirref_str);
+ return;
+ }
+
+ /* add to the taglist */
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag), gst_tag, value,
+ NULL);
+
+ /* clean up entry */
+ g_free (ptag->str);
+ g_slice_free (PendingXmpTag, ptag);
+ *pending_tags = g_slist_delete_link (*pending_tags, entry);
+}
+
+static void
+deserialize_exif_gps_track (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ deserialize_exif_gps_direction (xmptag, taglist, gst_tag, xmp_tag, str,
+ pending_tags, "exif:GPSTrack", "exif:GPSTrackRef");
+}
+
+static void
+deserialize_exif_gps_img_direction (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ deserialize_exif_gps_direction (xmptag, taglist, gst_tag, xmp_tag, str,
+ pending_tags, "exif:GPSImgDirection", "exif:GPSImgDirectionRef");
+}
+
+static void
+deserialize_xmp_rating (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ guint value;
+
+ if (sscanf (str, "%u", &value) != 1) {
+ GST_WARNING ("Failed to parse xmp:Rating %s", str);
+ return;
+ }
+
+ if (value < 0 || value > 100) {
+ GST_WARNING ("Unsupported Rating tag %u (should be from 0 to 100), "
+ "ignoring", value);
+ return;
+ }
+
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag), gst_tag, value,
+ NULL);
+}
+
+static gchar *
+serialize_tiff_orientation (const GValue * value)
+{
+ const gchar *str;
+ gint num;
+
+ str = g_value_get_string (value);
+ if (str == NULL) {
+ GST_WARNING ("Failed to get image orientation tag value");
+ return NULL;
+ }
+
+ num = __exif_tag_image_orientation_to_exif_value (str);
+ if (num == -1)
+ return NULL;
+
+ return g_strdup_printf ("%d", num);
+}
+
+static void
+deserialize_tiff_orientation (XmpTag * xmptag, GstTagList * taglist,
+ const gchar * gst_tag, const gchar * xmp_tag, const gchar * str,
+ GSList ** pending_tags)
+{
+ guint value;
+ const gchar *orientation = NULL;
+
+ if (sscanf (str, "%u", &value) != 1) {
+ GST_WARNING ("Failed to parse tiff:Orientation %s", str);
+ return;
+ }
+
+ if (value < 1 || value > 8) {
+ GST_WARNING ("Invalid tiff:Orientation tag %u (should be from 1 to 8), "
+ "ignoring", value);
+ return;
+ }
+
+ orientation = __exif_tag_image_orientation_from_exif_value (value);
+ if (orientation == NULL)
+ return;
+ gst_tag_list_add (taglist, xmp_tag_get_merge_mode (xmptag), gst_tag,
+ orientation, NULL);
+}
+
+
+/* look at this page for addtional schemas
+ * http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/XMP.html
+ */
+static gpointer
+_init_xmp_tag_map (gpointer user_data)
+{
+ GPtrArray *array;
+ XmpTag *xmpinfo;
+ GstXmpSchema *schema;
+
+ __xmp_schemas = g_hash_table_new (g_direct_hash, g_direct_equal);
+
+ /* add the maps */
+ /* dublic code metadata
+ * http://dublincore.org/documents/dces/
+ */
+ schema = gst_xmp_schema_new ();
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_ARTIST,
+ "dc:creator", GST_XMP_TAG_TYPE_SEQ, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_COPYRIGHT,
+ "dc:rights", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DATE, "dc:date",
+ GST_XMP_TAG_TYPE_SEQ, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DESCRIPTION,
+ "dc:description", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_KEYWORDS,
+ "dc:subject", GST_XMP_TAG_TYPE_BAG, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_TITLE, "dc:title",
+ GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ /* FIXME: we probably want GST_TAG_{,AUDIO_,VIDEO_}MIME_TYPE */
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_VIDEO_CODEC,
+ "dc:format", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_add_schema ("dc", schema);
+
+ /* xap (xmp) schema */
+ schema = gst_xmp_schema_new ();
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_USER_RATING,
+ "xmp:Rating", GST_XMP_TAG_TYPE_SIMPLE, NULL, deserialize_xmp_rating);
+ _gst_xmp_add_schema ("xap", schema);
+
+ /* tiff */
+ schema = gst_xmp_schema_new ();
+ _gst_xmp_schema_add_simple_mapping (schema,
+ GST_TAG_DEVICE_MANUFACTURER, "tiff:Make", GST_XMP_TAG_TYPE_SIMPLE, NULL,
+ NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DEVICE_MODEL,
+ "tiff:Model", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_APPLICATION_NAME,
+ "tiff:Software", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_IMAGE_ORIENTATION,
+ "tiff:Orientation", GST_XMP_TAG_TYPE_SIMPLE, serialize_tiff_orientation,
+ deserialize_tiff_orientation);
+ _gst_xmp_add_schema ("tiff", schema);
+
+ /* exif schema */
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DATE_TIME,
+ "exif:DateTimeOriginal", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema,
+ GST_TAG_GEO_LOCATION_LATITUDE, "exif:GPSLatitude",
+ GST_XMP_TAG_TYPE_SIMPLE, serialize_exif_latitude,
+ deserialize_exif_latitude);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_GEO_LOCATION_LONGITUDE,
+ "exif:GPSLongitude", GST_XMP_TAG_TYPE_SIMPLE, serialize_exif_longitude,
+ deserialize_exif_longitude);
+ _gst_xmp_schema_add_simple_mapping (schema,
+ GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, "exif:ExposureBiasValue",
+ GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+
+ /* compound exif tags */
+ array = g_ptr_array_sized_new (2);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSAltitude";
+ xmpinfo->serialize = serialize_exif_altitude;
+ xmpinfo->deserialize = deserialize_exif_altitude;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSAltitudeRef";
+ xmpinfo->serialize = serialize_exif_altituderef;
+ xmpinfo->deserialize = deserialize_exif_altitude;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ _gst_xmp_schema_add_mapping (schema, GST_TAG_GEO_LOCATION_ELEVATION, array);
+
+ array = g_ptr_array_sized_new (2);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSSpeed";
+ xmpinfo->serialize = serialize_exif_gps_speed;
+ xmpinfo->deserialize = deserialize_exif_gps_speed;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSSpeedRef";
+ xmpinfo->serialize = serialize_exif_gps_speedref;
+ xmpinfo->deserialize = deserialize_exif_gps_speed;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ _gst_xmp_schema_add_mapping (schema,
+ GST_TAG_GEO_LOCATION_MOVEMENT_SPEED, array);
+
+ array = g_ptr_array_sized_new (2);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSTrack";
+ xmpinfo->serialize = serialize_exif_gps_direction;
+ xmpinfo->deserialize = deserialize_exif_gps_track;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSTrackRef";
+ xmpinfo->serialize = serialize_exif_gps_directionref;
+ xmpinfo->deserialize = deserialize_exif_gps_track;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ _gst_xmp_schema_add_mapping (schema,
+ GST_TAG_GEO_LOCATION_MOVEMENT_DIRECTION, array);
+
+ array = g_ptr_array_sized_new (2);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSImgDirection";
+ xmpinfo->serialize = serialize_exif_gps_direction;
+ xmpinfo->deserialize = deserialize_exif_gps_img_direction;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ xmpinfo = g_slice_new (XmpTag);
+ xmpinfo->tag_name = "exif:GPSImgDirectionRef";
+ xmpinfo->serialize = serialize_exif_gps_directionref;
+ xmpinfo->deserialize = deserialize_exif_gps_img_direction;
+ xmpinfo->type = GST_XMP_TAG_TYPE_SIMPLE;
+ g_ptr_array_add (array, xmpinfo);
+ _gst_xmp_schema_add_mapping (schema,
+ GST_TAG_GEO_LOCATION_CAPTURE_DIRECTION, array);
+ _gst_xmp_add_schema ("exif", schema);
+
+ /* photoshop schema */
+ _gst_xmp_schema_add_simple_mapping (schema,
+ GST_TAG_GEO_LOCATION_COUNTRY, "photoshop:Country",
+ GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_schema_add_simple_mapping (schema, GST_TAG_GEO_LOCATION_CITY,
+ "photoshop:City", GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_add_schema ("photoshop", schema);
+
+ /* iptc4xmpcore schema */
+ _gst_xmp_schema_add_simple_mapping (schema,
+ GST_TAG_GEO_LOCATION_SUBLOCATION, "Iptc4xmpCore:Location",
+ GST_XMP_TAG_TYPE_SIMPLE, NULL, NULL);
+ _gst_xmp_add_schema ("Iptc4xmpCore", schema);
+
+ return NULL;
+}
+
+static void
+xmp_tags_initialize ()
+{
+ static GOnce my_once = G_ONCE_INIT;
+ g_once (&my_once, (GThreadFunc) _init_xmp_tag_map, NULL);
+}
+
+typedef struct _GstXmpNamespaceMatch GstXmpNamespaceMatch;
+struct _GstXmpNamespaceMatch
+{
+ const gchar *ns_prefix;
+ const gchar *ns_uri;
+};
+
+static const GstXmpNamespaceMatch ns_match[] = {
+ {"dc", "http://purl.org/dc/elements/1.1/"},
+ {"exif", "http://ns.adobe.com/exif/1.0/"},
+ {"tiff", "http://ns.adobe.com/tiff/1.0/"},
+ {"xap", "http://ns.adobe.com/xap/1.0/"},
+ {"photoshop", "http://ns.adobe.com/photoshop/1.0/"},
+ {"Iptc4xmpCore", "http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/"},
+ {NULL, NULL}
+};
+
+typedef struct _GstXmpNamespaceMap GstXmpNamespaceMap;
+struct _GstXmpNamespaceMap
+{
+ const gchar *original_ns;
+ gchar *gstreamer_ns;
+};
+
+/* parsing */
+
+static void
+read_one_tag (GstTagList * list, const gchar * tag, XmpTag * xmptag,
+ const gchar * v, GSList ** pending_tags)
+{
+ GType tag_type;
+ GstTagMergeMode merge_mode;
+
+ if (xmptag && xmptag->deserialize) {
+ xmptag->deserialize (xmptag, list, tag, xmptag->tag_name, v, pending_tags);
+ return;
+ }
+
+ merge_mode = xmp_tag_get_merge_mode (xmptag);
+ tag_type = gst_tag_get_type (tag);
+
+ /* add gstreamer tag depending on type */
+ switch (tag_type) {
+ case G_TYPE_STRING:{
+ gst_tag_list_add (list, merge_mode, tag, v, NULL);
+ break;
+ }
+ case G_TYPE_DOUBLE:{
+ gdouble value = 0;
+ gint frac_n, frac_d;
+
+ if (sscanf (v, "%d/%d", &frac_n, &frac_d) == 2) {
+ gst_util_fraction_to_double (frac_n, frac_d, &value);
+ gst_tag_list_add (list, merge_mode, tag, value, NULL);
+ } else {
+ GST_WARNING ("Failed to parse fraction: %s", v);
+ }
+ break;
+ }
+ default:
+ if (tag_type == GST_TYPE_DATE_TIME) {
+ GstDateTime *datetime = NULL;
+ gint year = 0, month = 0, day = 0, hour = 0, minute = 0, second = 0;
+ gint usecs = 0;
+ gint gmt_offset_hour = -1, gmt_offset_min = -1, gmt_offset = -1;
+ gchar usec_str[16];
+ gint ret;
+ gint len;
+
+ len = strlen (v);
+ if (len == 0) {
+ GST_WARNING ("Empty string for datetime parsing");
+ return;
+ }
+
+ GST_DEBUG ("Parsing %s into a datetime", v);
+
+ ret = sscanf (v, "%04d-%02d-%02dT%02d:%02d:%02d.%15s",
+ &year, &month, &day, &hour, &minute, &second, usec_str);
+ if (ret < 3) {
+ /* FIXME theoretically, xmp can express datetimes with only year
+ * or year and month, but gstdatetime doesn't support it */
+ GST_WARNING ("Invalid datetime value: %s", v);
+ }
+
+ /* parse the usecs */
+ if (ret >= 7) {
+ gint num_digits = 0;
+
+ /* find the number of digits */
+ while (isdigit ((gint) usec_str[num_digits++]) && num_digits < 6);
+
+ if (num_digits > 0) {
+ /* fill up to 6 digits with 0 */
+ while (num_digits < 6) {
+ usec_str[num_digits++] = 0;
+ }
+
+ g_assert (num_digits == 6);
+
+ usec_str[num_digits] = '\0';
+ usecs = atoi (usec_str);
+ }
+ }
+
+ /* parse the timezone info */
+ if (v[len - 1] == 'Z') {
+ GST_LOG ("UTC timezone");
+
+ /* Having a Z at the end means UTC */
+ datetime = gst_date_time_new (0, year, month, day, hour, minute,
+ second + usecs / 1000000.0);
+ } else {
+ gchar *plus_pos = NULL;
+ gchar *neg_pos = NULL;
+ gchar *pos = NULL;
+
+ GST_LOG ("Checking for timezone information");
+
+ /* check if there is timezone info */
+ plus_pos = strrchr (v, '+');
+ neg_pos = strrchr (v, '-');
+ if (plus_pos) {
+ pos = plus_pos + 1;
+ } else if (neg_pos) {
+ pos = neg_pos + 1;
+ }
+
+ if (pos) {
+ gint ret_tz = sscanf (pos, "%d:%d", &gmt_offset_hour,
+ &gmt_offset_min);
+
+ GST_DEBUG ("Parsing timezone: %s", pos);
+
+ if (ret_tz == 2) {
+ gmt_offset = gmt_offset_hour * 60 + gmt_offset_min;
+ if (neg_pos != NULL && neg_pos + 1 == pos)
+ gmt_offset *= -1;
+
+ GST_LOG ("Timezone offset: %f (%d minutes)", gmt_offset / 60.0,
+ gmt_offset);
+
+ /* no way to know if it is DST or not */
+ datetime =
+ gst_date_time_new (gmt_offset / 60.0,
+ year, month, day, hour, minute,
+ second + usecs / ((gdouble) G_USEC_PER_SEC));
+ } else {
+ GST_WARNING ("Failed to parse timezone information");
+ }
+ } else {
+ GST_WARNING ("No timezone signal found");
+ }
+ }
+
+ if (datetime) {
+ gst_tag_list_add (list, merge_mode, tag, datetime, NULL);
+ gst_date_time_unref (datetime);
+ }
+
+ } else if (tag_type == GST_TYPE_DATE) {
+ GDate *date;
+ gint d, m, y;
+
+ /* this is ISO 8601 Date and Time Format
+ * %F Equivalent to %Y-%m-%d (the ISO 8601 date format). (C99)
+ * %T The time in 24-hour notation (%H:%M:%S). (SU)
+ * e.g. 2009-05-30T18:26:14+03:00 */
+
+ /* FIXME: this would be the proper way, but needs
+ #define _XOPEN_SOURCE before #include <time.h>
+
+ date = g_date_new ();
+ struct tm tm={0,};
+ strptime (dts, "%FT%TZ", &tm);
+ g_date_set_time_t (date, mktime(&tm));
+ */
+ /* FIXME: this cannot parse the date
+ date = g_date_new ();
+ g_date_set_parse (date, v);
+ if (g_date_valid (date)) {
+ gst_tag_list_add (list, merge_mode, tag,
+ date, NULL);
+ } else {
+ GST_WARNING ("unparsable date: '%s'", v);
+ }
+ */
+ /* poor mans straw */
+ sscanf (v, "%04d-%02d-%02dT", &y, &m, &d);
+ date = g_date_new_dmy (d, m, y);
+ gst_tag_list_add (list, merge_mode, tag, date, NULL);
+ g_date_free (date);
+ } else {
+ GST_WARNING ("unhandled type for %s from xmp", tag);
+ }
+ break;
+ }
+}
+
+/**
+ * gst_tag_list_from_xmp_buffer:
+ * @buffer: buffer
+ *
+ * Parse a xmp packet into a taglist.
+ *
+ * Returns: new taglist or %NULL, free the list when done
+ *
+ * Since: 0.10.29
+ */
+GstTagList *
+gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
+{
+ GstTagList *list = NULL;
+ const gchar *xps, *xp1, *xp2, *xpe, *ns, *ne;
+ guint len, max_ft_len;
+ gboolean in_tag;
+ gchar *part, *pp;
+ guint i;
+ const gchar *last_tag = NULL;
+ XmpTag *last_xmp_tag = NULL;
+ GSList *pending_tags = NULL;
+
+ GstXmpNamespaceMap ns_map[] = {
+ {"dc", NULL},
+ {"exif", NULL},
+ {"tiff", NULL},
+ {"xap", NULL},
+ {"photoshop", NULL},
+ {"Iptc4xmpCore", NULL},
+ {NULL, NULL}
+ };
+
+ xmp_tags_initialize ();
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
+ g_return_val_if_fail (GST_BUFFER_SIZE (buffer) > 0, NULL);
+
+ xps = (const gchar *) GST_BUFFER_DATA (buffer);
+ len = GST_BUFFER_SIZE (buffer);
+ xpe = &xps[len + 1];
+
+ /* check header and footer */
+ xp1 = g_strstr_len (xps, len, "<?xpacket begin");
+ if (!xp1)
+ goto missing_header;
+ xp1 = &xp1[strlen ("<?xpacket begin")];
+ while (*xp1 != '>' && *xp1 != '<' && xp1 < xpe)
+ xp1++;
+ if (*xp1 != '>')
+ goto missing_header;
+
+ max_ft_len = 1 + strlen ("<?xpacket end=\".\"?>\n");
+ if (len < max_ft_len)
+ goto missing_footer;
+
+ GST_DEBUG ("checking footer: [%s]", &xps[len - max_ft_len]);
+ xp2 = g_strstr_len (&xps[len - max_ft_len], max_ft_len, "<?xpacket ");
+ if (!xp2)
+ goto missing_footer;
+
+ GST_INFO ("xmp header okay");
+
+ /* skip > and text until first xml-node */
+ xp1++;
+ while (*xp1 != '<' && xp1 < xpe)
+ xp1++;
+
+ /* no tag can be longer that the whole buffer */
+ part = g_malloc (xp2 - xp1);
+ list = gst_tag_list_new ();
+
+ /* parse data into a list of nodes */
+ /* data is between xp1..xp2 */
+ in_tag = TRUE;
+ ns = ne = xp1;
+ pp = part;
+ while (ne < xp2) {
+ if (in_tag) {
+ ne++;
+ while (ne < xp2 && *ne != '>' && *ne != '<') {
+ if (*ne == '\n' || *ne == '\t' || *ne == ' ') {
+ while (ne < xp2 && (*ne == '\n' || *ne == '\t' || *ne == ' '))
+ ne++;
+ *pp++ = ' ';
+ } else {
+ *pp++ = *ne++;
+ }
+ }
+ *pp = '\0';
+ if (*ne != '>')
+ goto broken_xml;
+ /* create node */
+ /* {XML, ns, ne-ns} */
+ if (ns[0] != '/') {
+ gchar *as = strchr (part, ' ');
+ /* only log start nodes */
+ GST_INFO ("xml: %s", part);
+
+ if (as) {
+ gchar *ae, *d;
+
+ /* skip ' ' and scan the attributes */
+ as++;
+ d = ae = as;
+
+ /* split attr=value pairs */
+ while (*ae != '\0') {
+ if (*ae == '=') {
+ /* attr/value delimmiter */
+ d = ae;
+ } else if (*ae == '"') {
+ /* scan values */
+ gchar *v;
+
+ ae++;
+ while (*ae != '\0' && *ae != '"')
+ ae++;
+
+ *d = *ae = '\0';
+ v = &d[2];
+ GST_INFO (" : [%s][%s]", as, v);
+ if (!strncmp (as, "xmlns:", 6)) {
+ i = 0;
+ /* we need to rewrite known namespaces to what we use in
+ * tag_matches */
+ while (ns_match[i].ns_prefix) {
+ if (!strcmp (ns_match[i].ns_uri, v))
+ break;
+ i++;
+ }
+ if (ns_match[i].ns_prefix) {
+ if (strcmp (ns_map[i].original_ns, &as[6])) {
+ ns_map[i].gstreamer_ns = g_strdup (&as[6]);
+ }
+ }
+ } else {
+ const gchar *gst_tag;
+ XmpTag *xmp_tag = NULL;
+ /* FIXME: eventualy rewrite ns
+ * find ':'
+ * check if ns before ':' is in ns_map and ns_map[i].gstreamer_ns!=NULL
+ * do 2 stage filter in tag_matches
+ */
+ gst_tag = _gst_xmp_tag_get_mapping_reverse (as, &xmp_tag);
+ if (gst_tag) {
+ PendingXmpTag *ptag;
+
+ ptag = g_slice_new (PendingXmpTag);
+ ptag->gst_tag = gst_tag;
+ ptag->xmp_tag = xmp_tag;
+ ptag->str = g_strdup (v);
+
+ pending_tags = g_slist_append (pending_tags, ptag);
+ }
+ }
+ /* restore chars overwritten by '\0' */
+ *d = '=';
+ *ae = '"';
+ } else if (*ae == '\0' || *ae == ' ') {
+ /* end of attr/value pair */
+ as = &ae[1];
+ }
+ /* to next char if not eos */
+ if (*ae != '\0')
+ ae++;
+ }
+ } else {
+ /*
+ <dc:type><rdf:Bag><rdf:li>Image</rdf:li></rdf:Bag></dc:type>
+ <dc:creator><rdf:Seq><rdf:li/></rdf:Seq></dc:creator>
+ */
+ /* FIXME: eventualy rewrite ns */
+
+ /* skip rdf tags for now */
+ if (strncmp (part, "rdf:", 4)) {
+ const gchar *parttag;
+
+ parttag = _gst_xmp_tag_get_mapping_reverse (part, &last_xmp_tag);
+ if (parttag) {
+ last_tag = parttag;
+ }
+ }
+ }
+ }
+ /* next cycle */
+ ne++;
+ if (ne < xp2) {
+ if (*ne != '<')
+ in_tag = FALSE;
+ ns = ne;
+ pp = part;
+ }
+ } else {
+ while (ne < xp2 && *ne != '<') {
+ *pp++ = *ne;
+ ne++;
+ }
+ *pp = '\0';
+ /* create node */
+ /* {TXT, ns, (ne-ns)-1} */
+ if (ns[0] != '\n' && &ns[1] <= ne) {
+ /* only log non-newline nodes, we still have to parse them */
+ GST_INFO ("txt: %s", part);
+ if (last_tag) {
+ PendingXmpTag *ptag;
+
+ ptag = g_slice_new (PendingXmpTag);
+ ptag->gst_tag = last_tag;
+ ptag->xmp_tag = last_xmp_tag;
+ ptag->str = g_strdup (part);
+
+ pending_tags = g_slist_append (pending_tags, ptag);
+ }
+ }
+ /* next cycle */
+ in_tag = TRUE;
+ ns = ne;
+ pp = part;
+ }
+ }
+
+ while (pending_tags) {
+ PendingXmpTag *ptag = (PendingXmpTag *) pending_tags->data;
+
+ pending_tags = g_slist_delete_link (pending_tags, pending_tags);
+
+ read_one_tag (list, ptag->gst_tag, ptag->xmp_tag, ptag->str, &pending_tags);
+
+ g_free (ptag->str);
+ g_slice_free (PendingXmpTag, ptag);
+ }
+
+ GST_INFO ("xmp packet parsed, %d entries",
+ gst_structure_n_fields ((GstStructure *) list));
+
+ /* free resources */
+ i = 0;
+ while (ns_map[i].original_ns) {
+ g_free (ns_map[i].gstreamer_ns);
+ i++;
+ }
+ g_free (part);
+
+ return list;
+
+ /* Errors */
+missing_header:
+ GST_WARNING ("malformed xmp packet header");
+ return NULL;
+missing_footer:
+ GST_WARNING ("malformed xmp packet footer");
+ return NULL;
+broken_xml:
+ GST_WARNING ("malformed xml tag: %s", part);
+ return NULL;
+}
+
+
+/* formatting */
+
+static void
+string_open_tag (GString * string, const char *tag)
+{
+ g_string_append_c (string, '<');
+ g_string_append (string, tag);
+ g_string_append_c (string, '>');
+}
+
+static void
+string_close_tag (GString * string, const char *tag)
+{
+ g_string_append (string, "</");
+ g_string_append (string, tag);
+ g_string_append (string, ">\n");
+}
+
+static char *
+gst_value_serialize_xmp (const GValue * value)
+{
+ switch (G_VALUE_TYPE (value)) {
+ case G_TYPE_STRING:
+ return g_markup_escape_text (g_value_get_string (value), -1);
+ case G_TYPE_INT:
+ return g_strdup_printf ("%d", g_value_get_int (value));
+ case G_TYPE_UINT:
+ return g_strdup_printf ("%u", g_value_get_uint (value));
+ case G_TYPE_DOUBLE:
+ return double_to_fraction_string (g_value_get_double (value));
+ default:
+ break;
+ }
+ /* put non-switchable types here */
+ if (G_VALUE_TYPE (value) == GST_TYPE_DATE) {
+ const GDate *date = gst_value_get_date (value);
+
+ return g_strdup_printf ("%04d-%02d-%02d",
+ (gint) g_date_get_year (date), (gint) g_date_get_month (date),
+ (gint) g_date_get_day (date));
+ } else if (G_VALUE_TYPE (value) == GST_TYPE_DATE_TIME) {
+ gint year, month, day, hour, min, sec, microsec;
+ gfloat gmt_offset = 0;
+ gint gmt_offset_hour, gmt_offset_min;
+ GstDateTime *datetime = (GstDateTime *) g_value_get_boxed (value);
+
+ year = gst_date_time_get_year (datetime);
+ month = gst_date_time_get_month (datetime);
+ day = gst_date_time_get_day (datetime);
+ hour = gst_date_time_get_hour (datetime);
+ min = gst_date_time_get_minute (datetime);
+ sec = gst_date_time_get_second (datetime);
+ microsec = gst_date_time_get_microsecond (datetime);
+ gmt_offset = gst_date_time_get_time_zone_offset (datetime);
+ if (gmt_offset == 0) {
+ /* UTC */
+ return g_strdup_printf ("%04d-%02d-%02dT%02d:%02d:%02d.%06dZ",
+ year, month, day, hour, min, sec, microsec);
+ } else {
+ gmt_offset_hour = ABS (gmt_offset);
+ gmt_offset_min = (ABS (gmt_offset) - gmt_offset_hour) * 60;
+
+ return g_strdup_printf ("%04d-%02d-%02dT%02d:%02d:%02d.%06d%c%02d:%02d",
+ year, month, day, hour, min, sec, microsec,
+ gmt_offset >= 0 ? '+' : '-', gmt_offset_hour, gmt_offset_min);
+ }
+ } else {
+ return NULL;
+ }
+}
+
+static void
+write_one_tag (const GstTagList * list, const gchar * tag, gpointer user_data)
+{
+ guint i = 0, ct = gst_tag_list_get_tag_size (list, tag), tag_index;
+ XmpSerializationData *serialization_data = user_data;
+ GString *data = serialization_data->data;
+ GPtrArray *xmp_tag_array = NULL;
+ char *s;
+
+ /* map gst-tag to xmp tag */
+ xmp_tag_array = _xmp_tag_get_mapping (tag, serialization_data);
+
+ if (!xmp_tag_array) {
+ GST_WARNING ("no mapping for %s to xmp", tag);
+ return;
+ }
+
+ for (tag_index = 0; tag_index < xmp_tag_array->len; tag_index++) {
+ XmpTag *xmp_tag;
+
+ xmp_tag = g_ptr_array_index (xmp_tag_array, tag_index);
+ string_open_tag (data, xmp_tag->tag_name);
+
+ /* fast path for single valued tag */
+ if (ct == 1 || xmp_tag->type == GST_XMP_TAG_TYPE_SIMPLE) {
+ if (xmp_tag->serialize) {
+ s = xmp_tag->serialize (gst_tag_list_get_value_index (list, tag, 0));
+ } else {
+ s = gst_value_serialize_xmp (gst_tag_list_get_value_index (list, tag,
+ 0));
+ }
+ if (s) {
+ g_string_append (data, s);
+ g_free (s);
+ } else {
+ GST_WARNING ("unhandled type for %s to xmp", tag);
+ }
+ } else {
+ const gchar *typename;
+
+ typename = xmp_tag_get_type_name (xmp_tag);
+
+ string_open_tag (data, typename);
+ for (i = 0; i < ct; i++) {
+ GST_DEBUG ("mapping %s[%u/%u] to xmp", tag, i, ct);
+ if (xmp_tag->serialize) {
+ s = xmp_tag->serialize (gst_tag_list_get_value_index (list, tag, i));
+ } else {
+ s = gst_value_serialize_xmp (gst_tag_list_get_value_index (list, tag,
+ i));
+ }
+ if (s) {
+ string_open_tag (data, "rdf:li");
+ g_string_append (data, s);
+ string_close_tag (data, "rdf:li");
+ g_free (s);
+ } else {
+ GST_WARNING ("unhandled type for %s to xmp", tag);
+ }
+ }
+ string_close_tag (data, typename);
+ }
+
+ string_close_tag (data, xmp_tag->tag_name);
+ }
+}
+
+/**
+ * gst_tag_list_to_xmp_buffer_full:
+ * @list: tags
+ * @read_only: does the container forbid inplace editing
+ * @schemas: %NULL terminated array of schemas to be used on serialization
+ *
+ * Formats a taglist as a xmp packet using only the selected
+ * schemas. An empty list (%NULL) means that all schemas should
+ * be used
+ *
+ * Returns: new buffer or %NULL, unref the buffer when done
+ *
+ * Since: 0.10.33
+ */
+GstBuffer *
+gst_tag_list_to_xmp_buffer_full (const GstTagList * list, gboolean read_only,
+ const gchar ** schemas)
+{
+ GstBuffer *buffer = NULL;
+ XmpSerializationData serialization_data;
+ GString *data;
+ guint i;
+
+ serialization_data.data = g_string_sized_new (4096);
+ serialization_data.schemas = schemas;
+ data = serialization_data.data;
+
+ xmp_tags_initialize ();
+
+ g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
+
+ /* xmp header */
+ g_string_append (data,
+ "<?xpacket begin=\"\xEF\xBB\xBF\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?>\n");
+ g_string_append (data,
+ "<x:xmpmeta xmlns:x=\"adobe:ns:meta/\" x:xmptk=\"GStreamer\">\n");
+ g_string_append (data,
+ "<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"");
+ i = 0;
+ while (ns_match[i].ns_prefix) {
+ if (xmp_serialization_data_use_schema (&serialization_data,
+ ns_match[i].ns_prefix))
+ g_string_append_printf (data, " xmlns:%s=\"%s\"",
+ ns_match[i].ns_prefix, ns_match[i].ns_uri);
+ i++;
+ }
+ g_string_append (data, ">\n");
+ g_string_append (data, "<rdf:Description rdf:about=\"\">\n");
+
+ /* iterate the taglist */
+ gst_tag_list_foreach (list, write_one_tag, &serialization_data);
+
+ /* xmp footer */
+ g_string_append (data, "</rdf:Description>\n");
+ g_string_append (data, "</rdf:RDF>\n");
+ g_string_append (data, "</x:xmpmeta>\n");
+
+ if (!read_only) {
+ /* the xmp spec recommand to add 2-4KB padding for in-place editable xmp */
+ guint i;
+
+ for (i = 0; i < 32; i++) {
+ g_string_append (data, " " " "
+ " " " " "\n");
+ }
+ }
+ g_string_append_printf (data, "<?xpacket end=\"%c\"?>\n",
+ (read_only ? 'r' : 'w'));
+
+ buffer = gst_buffer_new ();
+ GST_BUFFER_SIZE (buffer) = data->len + 1;
+ GST_BUFFER_DATA (buffer) = (guint8 *) g_string_free (data, FALSE);
+ GST_BUFFER_MALLOCDATA (buffer) = GST_BUFFER_DATA (buffer);
+
+ return buffer;
+}
+
+/**
+ * gst_tag_list_to_xmp_buffer:
+ * @list: tags
+ * @read_only: does the container forbid inplace editing
+ *
+ * Formats a taglist as a xmp packet.
+ *
+ * Returns: new buffer or %NULL, unref the buffer when done
+ *
+ * Since: 0.10.29
+ */
+GstBuffer *
+gst_tag_list_to_xmp_buffer (const GstTagList * list, gboolean read_only)
+{
+ return gst_tag_list_to_xmp_buffer_full (list, read_only, NULL);
+}
+
+#undef gst_xmp_schema_lookup
+#undef gst_xmp_schema_insert
projects / mafwsubrenderer / blobdiff