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tag: xmp: Write the same tag to all schemas

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Instead of writing only the xmp tag for the first found entry
that matches the gstreamer tag, look for all mappings to write
the tag to different schemas.

The rationale here is that some reader application might only
be interested on a particular schema tags, so we should try
to write as many tags for all schemas.
This commit is contained in:
Thiago Santos 2011-04-18 10:20:00 -03:00
parent 4c1cf01beb
commit 09ec43a22e
1 changed files with 44 additions and 12 deletions
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56
gst-libs/gst/tag/gstxmptag.c
View file

@ -182,6 +182,21 @@ gst_xmp_schema_new ()
*/
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)
{
@ -240,6 +255,7 @@ _gst_xmp_schema_add_simple_mapping (GstXmpSchema * schema,
* 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)
{
@ -260,6 +276,7 @@ _xmp_tag_get_mapping (const gchar * gst_tag, XmpSerializationData * serdata)
}
return ret;
}
#endif
/* finds the gst tag that maps to this xmp tag in this schema */
static const gchar *
@ -1520,22 +1537,14 @@ gst_value_serialize_xmp (const GValue * value)
}
static void
write_one_tag (const GstTagList * list, const gchar * tag, gpointer user_data)
write_one_tag (const GstTagList * list, const gchar * tag,
GPtrArray * xmp_tag_array, 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;
@ -1635,8 +1644,31 @@ gst_tag_list_to_xmp_buffer_full (const GstTagList * list, gboolean read_only,
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);
/* iterate the schemas */
if (schemas == NULL) {
/* use all schemas */
schemas = gst_tag_xmp_list_schemas ();
}
i = 0;
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)) {
const gchar *tag = g_quark_to_string (GPOINTER_TO_UINT (key));
if (gst_tag_list_get_value_index (list, tag, 0) != NULL) {
write_one_tag (list, tag, value, (gpointer) & serialization_data);
}
}
}
/* xmp footer */
g_string_append (data, "</rdf:Description>\n");