/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gsttagxmp
* @title: GstXmptag
* @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>
#define GST_CAT_DEFAULT gst_tag_ensure_debug_category()
static GstDebugCategory *
gst_tag_ensure_debug_category (void)
{
static gsize cat_gonce = 0;
if (g_once_init_enter (&cat_gonce)) {
GstDebugCategory *cat = NULL;
GST_DEBUG_CATEGORY_INIT (cat, "xmp-tags", 0, "XMP GstTag helper functions");
g_once_init_leave (&cat_gonce, (gsize) cat);
}
return (GstDebugCategory *) cat_gonce;
}
static const gchar *schema_list[] = {
"dc",
"xap",
"tiff",
"exif",
"photoshop",
"Iptc4xmpCore",
"Iptc4xmpExt",
NULL
};
/**
* gst_tag_xmp_list_schemas:
*
* Gets the list of supported schemas in the xmp lib
*
* Returns: (transfer none): a %NULL terminated array of strings with the
* schema names
*/
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;
}
typedef enum
{
GstXmpTagTypeNone = 0,
GstXmpTagTypeSimple,
GstXmpTagTypeBag,
GstXmpTagTypeSeq,
GstXmpTagTypeStruct,
/* Not really a xmp type, this is a tag that in gst is represented with
* a single value and on xmp it needs 2 (or more) simple values
*
* 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.
*/
GstXmpTagTypeCompound
} GstXmpTagType;
struct _XmpTag
{
const gchar *gst_tag;
const gchar *tag_name;
GstXmpTagType type;
/* some tags must be inside a Bag even
* if they are a single entry. Set it here so we know */
GstXmpTagType supertype;
/* For tags that need a rdf:parseType attribute */
const gchar *parse_type;
/* Used for struct and compound types */
GSList *children;
XmpSerializationFunc serialize;
XmpDeserializationFunc deserialize;
};
static GstTagMergeMode
xmp_tag_get_merge_mode (XmpTag * xmptag)
{
switch (xmptag->type) {
case GstXmpTagTypeBag:
case GstXmpTagTypeSeq:
return GST_TAG_MERGE_APPEND;
case GstXmpTagTypeSimple:
default:
return GST_TAG_MERGE_KEEP;
}
}
static const gchar *
xmp_tag_type_get_name (GstXmpTagType tagtype)
{
switch (tagtype) {
case GstXmpTagTypeSeq:
return "rdf:Seq";
case GstXmpTagTypeBag:
return "rdf:Bag";
default:
break;
}
/* Make compiler happy */
g_return_val_if_reached ("");
}
struct _PendingXmpTag
{
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).
*/
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 GstXmpSchema *
_gst_xmp_get_schema (const gchar * name)
{
GQuark key;
GstXmpSchema *schema;
key = g_quark_from_string (name);
schema = g_hash_table_lookup (__xmp_schemas, GUINT_TO_POINTER (key));
if (!schema) {
GST_WARNING ("Schema %s doesn't exist", name);
}
return schema;
}
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, XmpTag * tag)
{
GQuark key;
key = g_quark_from_string (tag->gst_tag);
if (gst_xmp_schema_lookup (schema, GUINT_TO_POINTER (key))) {
GST_WARNING ("Tag %s already present for the schema", tag->gst_tag);
g_assert_not_reached ();
return;
}
gst_xmp_schema_insert (schema, GUINT_TO_POINTER (key), tag);
}
static XmpTag *
gst_xmp_tag_create (const gchar * gst_tag, const gchar * xmp_tag,
gint xmp_type, XmpSerializationFunc serialization_func,
XmpDeserializationFunc deserialization_func)
{
XmpTag *xmpinfo;
xmpinfo = g_slice_new (XmpTag);
xmpinfo->gst_tag = gst_tag;
xmpinfo->tag_name = xmp_tag;
xmpinfo->type = xmp_type;
xmpinfo->supertype = GstXmpTagTypeNone;
xmpinfo->parse_type = NULL;
xmpinfo->serialize = serialization_func;
xmpinfo->deserialize = deserialization_func;
xmpinfo->children = NULL;
return xmpinfo;
}
static XmpTag *
gst_xmp_tag_create_compound (const gchar * gst_tag, const gchar * xmp_tag_a,
const gchar * xmp_tag_b, XmpSerializationFunc serialization_func_a,
XmpSerializationFunc serialization_func_b,
XmpDeserializationFunc deserialization_func)
{
XmpTag *xmptag;
XmpTag *xmptag_a =
gst_xmp_tag_create (gst_tag, xmp_tag_a, GstXmpTagTypeSimple,
serialization_func_a, deserialization_func);
XmpTag *xmptag_b =
gst_xmp_tag_create (gst_tag, xmp_tag_b, GstXmpTagTypeSimple,
serialization_func_b, deserialization_func);
xmptag =
gst_xmp_tag_create (gst_tag, NULL, GstXmpTagTypeCompound, NULL, NULL);
xmptag->children = g_slist_prepend (xmptag->children, xmptag_b);
xmptag->children = g_slist_prepend (xmptag->children, xmptag_a);
return xmptag;
}
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)
{
_gst_xmp_schema_add_mapping (schema,
gst_xmp_tag_create (gst_tag, xmp_tag, xmp_type, serialization_func,
deserialization_func));
}
/*
* 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
*/
#if 0
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;
}
#endif
/* 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;
/* Iterate over the hashtable */
g_hash_table_iter_init (&iter, schema);
while (!ret && g_hash_table_iter_next (&iter, &key, &value)) {
XmpTag *xmpinfo = (XmpTag *) value;
if (xmpinfo->tag_name) {
if (strcmp (xmpinfo->tag_name, xmp_tag) == 0) {
*_xmp_tag = xmpinfo;
ret = g_quark_to_string (GPOINTER_TO_UINT (key));
goto out;
}
} else if (xmpinfo->children) {
GSList *iter;
for (iter = xmpinfo->children; iter; iter = g_slist_next (iter)) {
XmpTag *child = iter->data;
if (strcmp (child->tag_name, xmp_tag) == 0) {
*_xmp_tag = child;
ret = g_quark_to_string (GPOINTER_TO_UINT (key));
goto out;
}
}
} else {
g_assert_not_reached ();
}
}
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) {
if (!sscanf (current, "%d,%d%c", &m, &s, &c))
goto error;
} 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 > 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)
{
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", GstXmpTagTypeSeq, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_COPYRIGHT,
"dc:rights", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DATE_TIME, "dc:date",
GstXmpTagTypeSeq, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DESCRIPTION,
"dc:description", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_KEYWORDS,
"dc:subject", GstXmpTagTypeBag, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_TITLE, "dc:title",
GstXmpTagTypeSimple, 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", GstXmpTagTypeSimple, 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", GstXmpTagTypeSimple, 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", GstXmpTagTypeSimple, NULL,
NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DEVICE_MODEL,
"tiff:Model", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_APPLICATION_NAME,
"tiff:Software", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_IMAGE_ORIENTATION,
"tiff:Orientation", GstXmpTagTypeSimple, serialize_tiff_orientation,
deserialize_tiff_orientation);
_gst_xmp_add_schema ("tiff", schema);
/* exif schema */
schema = gst_xmp_schema_new ();
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_DATE_TIME,
"exif:DateTimeOriginal", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema,
GST_TAG_GEO_LOCATION_LATITUDE, "exif:GPSLatitude",
GstXmpTagTypeSimple, serialize_exif_latitude, deserialize_exif_latitude);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_GEO_LOCATION_LONGITUDE,
"exif:GPSLongitude", GstXmpTagTypeSimple, serialize_exif_longitude,
deserialize_exif_longitude);
_gst_xmp_schema_add_simple_mapping (schema,
GST_TAG_CAPTURING_EXPOSURE_COMPENSATION, "exif:ExposureBiasValue",
GstXmpTagTypeSimple, NULL, NULL);
/* compound exif tags */
xmpinfo = gst_xmp_tag_create_compound (GST_TAG_GEO_LOCATION_ELEVATION,
"exif:GPSAltitude", "exif:GPSAltitudeRef", serialize_exif_altitude,
serialize_exif_altituderef, deserialize_exif_altitude);
_gst_xmp_schema_add_mapping (schema, xmpinfo);
xmpinfo = gst_xmp_tag_create_compound (GST_TAG_GEO_LOCATION_MOVEMENT_SPEED,
"exif:GPSSpeed", "exif:GPSSpeedRef", serialize_exif_gps_speed,
serialize_exif_gps_speedref, deserialize_exif_gps_speed);
_gst_xmp_schema_add_mapping (schema, xmpinfo);
xmpinfo =
gst_xmp_tag_create_compound (GST_TAG_GEO_LOCATION_MOVEMENT_DIRECTION,
"exif:GPSTrack", "exif:GPSTrackRef", serialize_exif_gps_direction,
serialize_exif_gps_directionref, deserialize_exif_gps_track);
_gst_xmp_schema_add_mapping (schema, xmpinfo);
xmpinfo = gst_xmp_tag_create_compound (GST_TAG_GEO_LOCATION_CAPTURE_DIRECTION,
"exif:GPSImgDirection", "exif:GPSImgDirectionRef",
serialize_exif_gps_direction, serialize_exif_gps_directionref,
deserialize_exif_gps_img_direction);
_gst_xmp_schema_add_mapping (schema, xmpinfo);
_gst_xmp_add_schema ("exif", schema);
/* photoshop schema */
schema = gst_xmp_schema_new ();
_gst_xmp_schema_add_simple_mapping (schema,
GST_TAG_GEO_LOCATION_COUNTRY, "photoshop:Country",
GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_schema_add_simple_mapping (schema, GST_TAG_GEO_LOCATION_CITY,
"photoshop:City", GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_add_schema ("photoshop", schema);
/* iptc4xmpcore schema */
schema = gst_xmp_schema_new ();
_gst_xmp_schema_add_simple_mapping (schema,
GST_TAG_GEO_LOCATION_SUBLOCATION, "Iptc4xmpCore:Location",
GstXmpTagTypeSimple, NULL, NULL);
_gst_xmp_add_schema ("Iptc4xmpCore", schema);
/* iptc4xmpext schema */
schema = gst_xmp_schema_new ();
xmpinfo = gst_xmp_tag_create (NULL, "Iptc4xmpExt:LocationShown",
GstXmpTagTypeStruct, NULL, NULL);
xmpinfo->supertype = GstXmpTagTypeBag;
xmpinfo->parse_type = "Resource";
xmpinfo->children = g_slist_prepend (xmpinfo->children,
gst_xmp_tag_create (GST_TAG_GEO_LOCATION_SUBLOCATION,
"LocationDetails:Sublocation", GstXmpTagTypeSimple, NULL, NULL));
xmpinfo->children =
g_slist_prepend (xmpinfo->children,
gst_xmp_tag_create (GST_TAG_GEO_LOCATION_CITY,
"LocationDetails:City", GstXmpTagTypeSimple, NULL, NULL));
xmpinfo->children =
g_slist_prepend (xmpinfo->children,
gst_xmp_tag_create (GST_TAG_GEO_LOCATION_COUNTRY,
"LocationDetails:Country", GstXmpTagTypeSimple, NULL, NULL));
_gst_xmp_schema_add_mapping (schema, xmpinfo);
_gst_xmp_add_schema ("Iptc4xmpExt", 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;
/*
* Stores extra namespaces for array tags
* The namespaces should be writen in the form:
*
* xmlns:XpTo="http://some.org/your/ns/name/ (next ones)"
*/
const gchar *extra_ns;
};
static const GstXmpNamespaceMatch ns_match[] = {
{"dc", "http://purl.org/dc/elements/1.1/", NULL},
{"exif", "http://ns.adobe.com/exif/1.0/", NULL},
{"tiff", "http://ns.adobe.com/tiff/1.0/", NULL},
{"xap", "http://ns.adobe.com/xap/1.0/", NULL},
{"photoshop", "http://ns.adobe.com/photoshop/1.0/", NULL},
{"Iptc4xmpCore", "http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/", NULL},
{"Iptc4xmpExt", "http://iptc.org/std/Iptc4xmpExt/2008-02-29/",
"xmlns:LocationDetails=\"http://iptc.org/std/Iptc4xmpExt/2008-02-29/LocationDetails/\""},
{NULL, NULL, NULL}
};
typedef struct _GstXmpNamespaceMap GstXmpNamespaceMap;
struct _GstXmpNamespaceMap
{
const gchar *original_ns;
gchar *gstreamer_ns;
};
/* parsing */
static void
read_one_tag (GstTagList * list, XmpTag * xmptag,
const gchar * v, GSList ** pending_tags)
{
GType tag_type;
GstTagMergeMode merge_mode;
const gchar *tag = xmptag->gst_tag;
g_return_if_fail (tag != NULL);
if (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;
if (v == NULL || *v == '\0') {
GST_WARNING ("Empty string for datetime parsing");
return;
}
GST_DEBUG ("Parsing %s into a datetime", v);
datetime = gst_date_time_new_from_iso8601_string (v);
if (datetime) {
gst_tag_list_add (list, merge_mode, tag, datetime, NULL);
gst_date_time_unref (datetime);
}
} else if (tag_type == G_TYPE_DATE) {
GST_ERROR ("Use GST_TYPE_DATE_TIME in tags instead of G_TYPE_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
*/
GstTagList *
gst_tag_list_from_xmp_buffer (GstBuffer * buffer)
{
GstTagList *list = NULL;
GstMapInfo info;
gchar *xps, *xp1, *xp2, *xpe, *ns, *ne;
gsize len, max_ft_len;
gboolean in_tag;
gchar *part = NULL, *pp;
guint i;
XmpTag *last_xmp_tag = NULL;
GSList *pending_tags = NULL;
/* Used for strucuture xmp tags */
XmpTag *context_tag = NULL;
GstXmpNamespaceMap ns_map[] = {
{"dc", NULL}
,
{"exif", NULL}
,
{"tiff", NULL}
,
{"xap", NULL}
,
{"photoshop", NULL}
,
{"Iptc4xmpCore", NULL}
,
{"Iptc4xmpExt", NULL}
,
{NULL, NULL}
};
xmp_tags_initialize ();
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
GST_LOG ("Starting xmp parsing");
gst_buffer_map (buffer, &info, GST_MAP_READ);
xps = (gchar *) info.data;
len = info.size;
g_return_val_if_fail (len > 0, NULL);
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;
/* Use 2 here to count for an extra trailing \n that was added
* in old versions, this makes it able to parse xmp packets with
* and without this trailing char */
max_ft_len = 2 + strlen ("<?xpacket end=\".\"?>");
if (len < max_ft_len)
goto missing_footer;
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 than the whole buffer */
part = g_malloc (xp2 - xp1);
list = gst_tag_list_new_empty ();
/* 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])) {
g_free (ns_map[i].gstreamer_ns);
ns_map[i].gstreamer_ns = g_strdup (&as[6]);
}
}
} else {
XmpTag *xmp_tag = NULL;
/* FIXME: eventually 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
*/
if (context_tag) {
GSList *iter;
for (iter = context_tag->children; iter;
iter = g_slist_next (iter)) {
XmpTag *child = iter->data;
GST_DEBUG ("Looking at child tag %s : %s", child->tag_name,
as);
if (strcmp (child->tag_name, as) == 0) {
xmp_tag = child;
break;
}
}
} else {
GST_LOG ("Looking for tag: %s", as);
_gst_xmp_tag_get_mapping_reverse (as, &xmp_tag);
}
if (xmp_tag) {
PendingXmpTag *ptag;
GST_DEBUG ("Found xmp tag: %s -> %s", xmp_tag->tag_name,
xmp_tag->gst_tag);
/* we shouldn't find a xmp structure here */
g_assert (xmp_tag->gst_tag != NULL);
ptag = g_slice_new (PendingXmpTag);
ptag->xmp_tag = xmp_tag;
ptag->str = g_strdup (v);
pending_tags = g_slist_prepend (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: eventually rewrite ns */
/* skip rdf tags for now */
if (strncmp (part, "rdf:", 4)) {
/* if we're inside some struct, we look only on its children */
if (context_tag) {
GSList *iter;
/* check if this is the closing of the context */
if (part[0] == '/'
&& strcmp (part + 1, context_tag->tag_name) == 0) {
GST_DEBUG ("Closing context tag %s", part);
context_tag = NULL;
} else {
for (iter = context_tag->children; iter;
iter = g_slist_next (iter)) {
XmpTag *child = iter->data;
GST_DEBUG ("Looking at child tag %s : %s", child->tag_name,
part);
if (strcmp (child->tag_name, part) == 0) {
last_xmp_tag = child;
break;
}
}
}
} else {
GST_LOG ("Looking for tag: %s", part);
_gst_xmp_tag_get_mapping_reverse (part, &last_xmp_tag);
if (last_xmp_tag && last_xmp_tag->type == GstXmpTagTypeStruct) {
context_tag = last_xmp_tag;
last_xmp_tag = NULL;
}
}
}
}
}
GST_LOG ("Next cycle");
/* 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_xmp_tag) {
PendingXmpTag *ptag;
GST_DEBUG ("Found tag %s -> %s", last_xmp_tag->tag_name,
last_xmp_tag->gst_tag);
if (last_xmp_tag->type == GstXmpTagTypeStruct) {
g_assert (context_tag == NULL); /* we can't handle struct nesting currently */
context_tag = last_xmp_tag;
} else {
ptag = g_slice_new (PendingXmpTag);
ptag->xmp_tag = last_xmp_tag;
ptag->str = g_strdup (part);
pending_tags = g_slist_prepend (pending_tags, ptag);
}
}
}
/* next cycle */
in_tag = TRUE;
ns = ne;
pp = part;
}
}
pending_tags = g_slist_reverse (pending_tags);
GST_DEBUG ("Done accumulating tags, now handling them");
while (pending_tags) {
PendingXmpTag *ptag = (PendingXmpTag *) pending_tags->data;
pending_tags = g_slist_delete_link (pending_tags, pending_tags);
read_one_tag (list, ptag->xmp_tag, ptag->str, &pending_tags);
g_free (ptag->str);
g_slice_free (PendingXmpTag, ptag);
}
GST_INFO ("xmp packet parsed, %d entries", gst_tag_list_n_tags (list));
out:
/* free resources */
i = 0;
while (ns_map[i].original_ns) {
g_free (ns_map[i].gstreamer_ns);
i++;
}
g_free (part);
gst_buffer_unmap (buffer, &info);
return list;
/* Errors */
missing_header:
GST_WARNING ("malformed xmp packet header");
goto out;
missing_footer:
GST_WARNING ("malformed xmp packet footer");
goto out;
broken_xml:
GST_WARNING ("malformed xml tag: %s", part);
gst_tag_list_unref (list);
list = NULL;
goto out;
}
/* 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) == G_TYPE_DATE) {
const GDate *date = g_value_get_boxed (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);
if (!gst_date_time_has_time (datetime))
return gst_date_time_to_iso8601_string (datetime);
/* can't just use gst_date_time_to_iso8601_string() here because we need
* the timezone info with a colon, i.e. as +03:00 instead of +0300 */
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, XmpTag * xmp_tag, gpointer user_data)
{
guint i = 0, ct;
XmpSerializationData *serialization_data = user_data;
GString *data = serialization_data->data;
char *s;
/* struct type handled differently */
if (xmp_tag->type == GstXmpTagTypeStruct ||
xmp_tag->type == GstXmpTagTypeCompound) {
GSList *iter;
gboolean use_it = FALSE;
/* check if any of the inner tags are present on the taglist */
for (iter = xmp_tag->children; iter && !use_it; iter = g_slist_next (iter)) {
XmpTag *child_tag = iter->data;
if (gst_tag_list_get_value_index (list, child_tag->gst_tag, 0) != NULL) {
use_it = TRUE;
break;
}
}
if (use_it) {
if (xmp_tag->tag_name)
string_open_tag (data, xmp_tag->tag_name);
if (xmp_tag->supertype) {
string_open_tag (data, xmp_tag_type_get_name (xmp_tag->supertype));
if (xmp_tag->parse_type) {
g_string_append (data, "<rdf:li rdf:parseType=\"");
g_string_append (data, xmp_tag->parse_type);
g_string_append_c (data, '"');
g_string_append_c (data, '>');
} else {
string_open_tag (data, "rdf:li");
}
}
/* now write it */
for (iter = xmp_tag->children; iter; iter = g_slist_next (iter)) {
write_one_tag (list, iter->data, user_data);
}
if (xmp_tag->supertype) {
string_close_tag (data, "rdf:li");
string_close_tag (data, xmp_tag_type_get_name (xmp_tag->supertype));
}
if (xmp_tag->tag_name)
string_close_tag (data, xmp_tag->tag_name);
}
return;
}
/* at this point we must have a gst_tag */
g_assert (xmp_tag->gst_tag);
if (gst_tag_list_get_value_index (list, xmp_tag->gst_tag, 0) == NULL)
return;
ct = gst_tag_list_get_tag_size (list, xmp_tag->gst_tag);
string_open_tag (data, xmp_tag->tag_name);
/* fast path for single valued tag */
if (ct == 1 || xmp_tag->type == GstXmpTagTypeSimple) {
if (xmp_tag->serialize) {
s = xmp_tag->serialize (gst_tag_list_get_value_index (list,
xmp_tag->gst_tag, 0));
} else {
s = gst_value_serialize_xmp (gst_tag_list_get_value_index (list,
xmp_tag->gst_tag, 0));
}
if (s) {
g_string_append (data, s);
g_free (s);
} else {
GST_WARNING ("unhandled type for %s to xmp", xmp_tag->gst_tag);
}
} else {
const gchar *typename;
typename = xmp_tag_type_get_name (xmp_tag->type);
string_open_tag (data, typename);
for (i = 0; i < ct; i++) {
GST_DEBUG ("mapping %s[%u/%u] to xmp", xmp_tag->gst_tag, i, ct);
if (xmp_tag->serialize) {
s = xmp_tag->serialize (gst_tag_list_get_value_index (list,
xmp_tag->gst_tag, i));
} else {
s = gst_value_serialize_xmp (gst_tag_list_get_value_index (list,
xmp_tag->gst_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", xmp_tag->gst_tag);
}
}
string_close_tag (data, typename);
}
string_close_tag (data, xmp_tag->tag_name);
}
/**
* gst_tag_list_to_xmp_buffer:
* @list: tags
* @read_only: does the container forbid inplace editing
* @schemas: (array zero-terminated):
* %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
*/
GstBuffer *
gst_tag_list_to_xmp_buffer (const GstTagList * list, gboolean read_only,
const gchar ** schemas)
{
GstBuffer *buffer = NULL;
XmpSerializationData serialization_data;
GString *data;
guint i;
gsize bsize;
gpointer bdata;
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);
if (ns_match[i].extra_ns) {
g_string_append_printf (data, " %s", ns_match[i].extra_ns);
}
}
i++;
}
g_string_append (data, ">\n");
g_string_append (data, "<rdf:Description rdf:about=\"\">\n");
/* iterate the schemas */
if (schemas == NULL) {
/* use all schemas */
schemas = gst_tag_xmp_list_schemas ();
}
for (i = 0; schemas[i] != NULL; i++) {
GstXmpSchema *schema = _gst_xmp_get_schema (schemas[i]);
GHashTableIter iter;
gpointer key, value;
if (schema == NULL)
continue;
/* Iterate over the hashtable */
g_hash_table_iter_init (&iter, schema);
while (g_hash_table_iter_next (&iter, &key, &value)) {
write_one_tag (list, value, (gpointer) & 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 recommends 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\"?>",
(read_only ? 'r' : 'w'));
bsize = data->len;
bdata = g_string_free (data, FALSE);
buffer = gst_buffer_new_wrapped (bdata, bsize);
return buffer;
}
#undef gst_xmp_schema_lookup
#undef gst_xmp_schema_insert