[rhythmbox] metadata: handle extended comment tags

[Jonathan Matthew <jmatthew src gnome org>]

commit 9a4214b8adc90b465467673b862ea5bfbf3a93f9
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Sep 4 20:59:48 2013 +1000

    metadata: handle extended comment tags
    
    ID3 comment tags often show up as extended comments of the
    form 'Comment[xxx]=actual comment string', so we now translate
    these into the rhythmdb comment property.
    
    Based on patches from lmf <jimmythy gmail com>.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707184

 metadata/rb-metadata-gst.c |   37 ++++++++++++++++++++++++++++++++++---
 1 files changed, 34 insertions(+), 3 deletions(-)
---
diff --git a/metadata/rb-metadata-gst.c b/metadata/rb-metadata-gst.c
index e64477c..488c56d 100644
--- a/metadata/rb-metadata-gst.c
+++ b/metadata/rb-metadata-gst.c
@@ -823,6 +823,9 @@ rb_metadata_get (RBMetaData *md, RBMetaDataField field, GValue *ret)
        GValue gstvalue = {0, };
        GstClockTime duration;
        GstDateTime *datetime;
+       char *str = NULL;
+       const char *v;
+       int i;
 
        if (md->priv->info == NULL)
                return FALSE;
@@ -873,6 +876,37 @@ rb_metadata_get (RBMetaData *md, RBMetaDataField field, GValue *ret)
                        return TRUE;
                }
                break;
+       case RB_METADATA_FIELD_COMMENT:
+               tags = gst_discoverer_info_get_tags (md->priv->info);
+               if (tags == NULL)
+                       return FALSE;
+
+               /* pick the first valid utf8 string that looks like a comment */
+               i = 0;
+               while (gst_tag_list_peek_string_index (tags, GST_TAG_EXTENDED_COMMENT, i, &v)) {
+                       if (g_utf8_validate (v, -1, NULL)) {
+                               char **bits;
+
+                               /* field must look like key=value,
+                                * key must be 'comment' or 'comment[lang]'
+                                */
+                               bits = g_strsplit (v, "=", 2);
+                               if (bits[1] != NULL &&
+                                   (g_ascii_strcasecmp (bits[0], "comment") == 0 ||
+                                   g_ascii_strncasecmp (bits[0], "comment[", 8) == 0)) {
+                                       g_value_init (ret, G_TYPE_STRING);
+                                       g_value_set_string (ret, bits[1]);
+                                       g_strfreev (bits);
+                                       return TRUE;
+                               }
+
+                               g_strfreev (bits);
+                       } else {
+                               rb_debug ("ignoring %s", v);
+                       }
+                       i++;
+               }
+               break;
        default:
                break;
        }
@@ -888,9 +922,6 @@ rb_metadata_get (RBMetaData *md, RBMetaDataField field, GValue *ret)
        }
 
        if (rb_metadata_get_field_type (field) == G_TYPE_STRING) {
-               char *str = NULL;
-               const char *v;
-               int i;
 
                /* pick the first valid utf8 string, or if we find a later
                 * string of which the first is a prefix, pick that.