Here is my change on Tracker GStreamer extractor and it works. Is this method
doable? And Can I submit a patch for it?
For OMA DRM content format (DCF), it will try GStreamer at first. If GStreamer
DRM-aware extensions are installed, then decodebin2 can recognize the original
media type and extract rich meta data. Otherwise, the extractor will extract
basic media type from the unencrypted file header, and mark it as a piece of
music, video or image. Other mime types are not recognized yet and the
nie:mimeType is not changed.
static TrackerExtractData data[] = {
{ "audio/*", extract_gstreamer_audio },
{ "video/*", extract_gstreamer_video },
{ "image/*", extract_gstreamer_image },
/* Tell gstreamer to guess if mimetype guessing returns video also for
audio files */
{ "image/svg+xml", extract_gstreamer_svg },
{ "video/3gpp", extract_gstreamer_guess },
{ "video/mp4", extract_gstreamer_guess },
{ "video/x-ms-asf", extract_gstreamer_guess },
+ /* DRM types */
+ { "application/vnd.oma.drm.content", extract_gstreamer_dcf},
{ NULL, NULL }
};
static void
extract_gstreamer_dcf (const gchar *uri,
TrackerSparqlBuilder *preupdate,
TrackerSparqlBuilder *metadata)
{
gint items;
tracker_extract_gstreamer (uri, preupdate, metadata,
EXTRACT_MIME_GUESS);
items = tracker_sparql_builder_get_length (metadata);
if(0 == items)
{
g_debug("GStreamer has not OMA-DRM-aware extensions\n");
extract_dcf_self(uri, preupdate, metadata);
}
}
/* Extract original MIME type from DCF file header, no more information can be
got from the file header. */
static void
extract_dcf_self ( const gchar *uri,
TrackerSparqlBuilder *preupdate,
TrackerSparqlBuilder *metadata)
{
gchar *filename;
goffset filesize;
FILE * fp = NULL;
guchar dcf_version;
guchar content_type_len;
guchar content_uri_len;
gchar ori_mime_type[OMA_MAX_MIME_TYPE_LEN];
filename = g_filename_from_uri (uri, NULL, NULL);
filesize = tracker_file_get_size (filename);
if (filesize < 3) {
/* at least 3 bytes, version, original content MIME type length
and uri length */
g_free (filename);
return;
}
fp = tracker_file_open (filename, "r", TRUE);
if(!fp) return;
if(1 != fread(&dcf_version, sizeof(gchar), 1, fp))
goto bail;
if(1 != dcf_version) goto bail; /* only support version 1.0 */
if(1 != fread(&content_type_len, sizeof(guchar), 1, fp))
goto bail;
if(1 != fread(&content_uri_len, sizeof(guchar), 1, fp))
goto bail;
memset(ori_mime_type, 0, OMA_MAX_MIME_TYPE_LEN);
if(1 != fread(&ori_mime_type, content_type_len, 1, fp))
goto bail;
tracker_sparql_builder_predicate (metadata, "a");
if(!memcmp(ori_mime_type, "audio", 5)) {
tracker_sparql_builder_object (metadata, "nmm:MusicPiece");
tracker_sparql_builder_object (metadata, "nfo:Audio");
}
else if(!memcmp(ori_mime_type, "video", 5)) {
tracker_sparql_builder_object (metadata, "nmm:Video");
}
else if(!memcmp(ori_mime_type, "image", 5)) {
tracker_sparql_builder_object (metadata, "nfo:Image");
}
/* other types are not recognized yet */
bail:
if(fp)
tracker_file_close(fp, FALSE);
}
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