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tag: xmp: Add support for reading struct tags

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Adds a context variable that controls if the parsing is on
'top level' tags or inside a struct tag.
This commit is contained in:
Thiago Santos 2011-04-19 11:00:24 -03:00
parent 1b29009bb3
commit 12813fc10b
1 changed files with 81 additions and 18 deletions
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99
gst-libs/gst/tag/gstxmptag.c
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@ -170,7 +170,6 @@ xmp_tag_get_type_name (XmpTag * xmptag)
struct _PendingXmpTag
{
const gchar *gst_tag;
XmpTag *xmp_tag;
gchar *str;
};
@ -1045,11 +1044,14 @@ struct _GstXmpNamespaceMap
/* parsing */
static void
read_one_tag (GstTagList * list, const gchar * tag, XmpTag * xmptag,
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 && xmptag->deserialize) {
xmptag->deserialize (xmptag, list, tag, xmptag->tag_name, v, pending_tags);
@ -1236,10 +1238,12 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
gboolean in_tag;
gchar *part, *pp;
guint i;
const gchar *last_tag = NULL;
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},
@ -1255,6 +1259,8 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
g_return_val_if_fail (GST_BUFFER_SIZE (buffer) > 0, NULL);
GST_LOG ("Starting xmp parsing");
xps = (const gchar *) GST_BUFFER_DATA (buffer);
len = GST_BUFFER_SIZE (buffer);
xpe = &xps[len + 1];
@ -1354,19 +1360,41 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
}
}
} 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) {
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->gst_tag = gst_tag;
ptag->xmp_tag = xmp_tag;
ptag->str = g_strdup (v);
@ -1393,15 +1421,42 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
/* skip rdf tags for now */
if (strncmp (part, "rdf:", 4)) {
const gchar *parttag;
/* if we're inside some struct, we look only on its children */
if (context_tag) {
GSList *iter;
parttag = _gst_xmp_tag_get_mapping_reverse (part, &last_xmp_tag);
if (parttag) {
last_tag = parttag;
/* 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) {
@ -1421,15 +1476,23 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
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) {
if (last_xmp_tag) {
PendingXmpTag *ptag;
ptag = g_slice_new (PendingXmpTag);
ptag->gst_tag = last_tag;
ptag->xmp_tag = last_xmp_tag;
ptag->str = g_strdup (part);
GST_DEBUG ("Found tag %s -> %s", last_xmp_tag->tag_name,
last_xmp_tag->gst_tag);
pending_tags = g_slist_append (pending_tags, ptag);
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_append (pending_tags, ptag);
}
}
}
/* next cycle */
@ -1444,7 +1507,7 @@ gst_tag_list_from_xmp_buffer (const GstBuffer * buffer)
pending_tags = g_slist_delete_link (pending_tags, pending_tags);
read_one_tag (list, ptag->gst_tag, ptag->xmp_tag, ptag->str, &pending_tags);
read_one_tag (list, ptag->xmp_tag, ptag->str, &pending_tags);
g_free (ptag->str);
g_slice_free (PendingXmpTag, ptag);