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mpdparser: Handle invalid external xml link for Period element

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Section 5.3.3 in ISO/IEC 23009-1:2014 defines that invalid references
(e.g., invalide URI or cannot be resolved) specified by "@xlink:href" attribute
shall be removed. That means, we should play it without error,
and just ignore the corresponding element.
It's similar to "urn:mpeg:dash:resolve-to-zero:2013".

https://bugzilla.gnome.org/show_bug.cgi?id=774463
This commit is contained in:
Seungha Yang 2016-11-19 18:37:54 +09:00 committed by Sebastian Dröge
parent 5591f55db5
commit e454694f0a
2 changed files with 27 additions and 41 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
ext/dash/gstmpdparser.c
View file

@ -227,7 +227,7 @@ static GstUri *combine_urls (GstUri * base, GList * list, gchar ** query,
guint idx);
static GList *gst_mpd_client_fetch_external_period (GstMpdClient * client,
GstPeriodNode * period_node, gboolean * error);
GstPeriodNode * period_node);
static GList *gst_mpd_client_fetch_external_adaptation_set (GstMpdClient *
client, GstPeriodNode * period, GstAdaptationSetNode * adapt_set,
gboolean * error);
@ -3637,13 +3637,8 @@ gst_mpd_client_fetch_on_load_external_resources (GstMpdClient * client)
if (period->xlink_href && period->actuate == GST_XLINK_ACTUATE_ON_LOAD) {
GList *new_periods, *prev, *next;
gboolean error;
new_periods =
gst_mpd_client_fetch_external_period (client, period, &error);
if (!new_periods && error)
goto syntax_error;
new_periods = gst_mpd_client_fetch_external_period (client, period);
prev = l->prev;
client->mpd_node->Periods =
@ -4191,21 +4186,19 @@ gst_mpd_client_setup_representation (GstMpdClient * client,
static GList *
gst_mpd_client_fetch_external_period (GstMpdClient * client,
GstPeriodNode * period_node, gboolean * error)
GstPeriodNode * period_node)
{
GstFragment *download;
GstAdapter *adapter;
GstBuffer *period_buffer;
GError *err = NULL;
xmlDocPtr doc;
xmlDocPtr doc = NULL;
GstUri *base_uri, *uri;
gchar *query = NULL;
gchar *uri_string, *wrapper;
GList *new_periods = NULL;
const gchar *data;
*error = FALSE;
/* ISO/IEC 23009-1:2014 5.5.3 4)
* Remove nodes that resolve to nothing when resolving
*/
@ -4215,7 +4208,6 @@ gst_mpd_client_fetch_external_period (GstMpdClient * client,
}
if (!client->downloader) {
*error = TRUE;
return NULL;
}
@ -4245,7 +4237,6 @@ gst_mpd_client_fetch_external_period (GstMpdClient * client,
GST_ERROR ("Failed to download external Period node at '%s': %s",
period_node->xlink_href, err->message);
g_clear_error (&err);
*error = TRUE;
return NULL;
}
@ -4273,6 +4264,11 @@ gst_mpd_client_fetch_external_period (GstMpdClient * client,
doc =
xmlReadMemory (data, gst_adapter_available (adapter), "noname.xml", NULL,
XML_PARSE_NONET);
gst_adapter_unmap (adapter);
gst_adapter_clear (adapter);
gst_object_unref (adapter);
if (doc) {
xmlNode *root_element = xmlDocGetRootElement (doc);
xmlNode *iter;
@ -4290,27 +4286,24 @@ gst_mpd_client_fetch_external_period (GstMpdClient * client,
}
}
} else {
GST_ERROR ("Failed to parse period node XML");
gst_adapter_unmap (adapter);
gst_adapter_clear (adapter);
gst_object_unref (adapter);
*error = TRUE;
return NULL;
goto error;
}
xmlFreeDoc (doc);
gst_adapter_unmap (adapter);
gst_adapter_clear (adapter);
gst_object_unref (adapter);
done:
if (doc)
xmlFreeDoc (doc);
return new_periods;
error:
xmlFreeDoc (doc);
gst_adapter_unmap (adapter);
gst_adapter_clear (adapter);
gst_object_unref (adapter);
*error = TRUE;
return NULL;
GST_ERROR ("Failed to parse period node XML");
if (new_periods) {
g_list_free_full (new_periods,
(GDestroyNotify) gst_mpdparser_free_period_node);
new_periods = NULL;
}
goto done;
}
gboolean
@ -4374,13 +4367,9 @@ gst_mpd_client_setup_media_presentation (GstMpdClient * client,
/* Download external period */
if (period_node->xlink_href) {
GList *new_periods;
gboolean error = FALSE;
GList *prev;
new_periods =
gst_mpd_client_fetch_external_period (client, period_node, &error);
if (!new_periods && error)
goto syntax_error;
new_periods = gst_mpd_client_fetch_external_period (client, period_node);
prev = list->prev;
client->mpd_node->Periods =
@ -4449,15 +4438,10 @@ gst_mpd_client_setup_media_presentation (GstMpdClient * client,
next_period_node = next->data;
if (next_period_node->xlink_href) {
gboolean next_error;
GList *new_periods;
new_periods =
gst_mpd_client_fetch_external_period (client, next_period_node,
&next_error);
if (!new_periods && next_error)
goto syntax_error;
gst_mpd_client_fetch_external_period (client, next_period_node);
client->mpd_node->Periods =
g_list_delete_link (client->mpd_node->Periods, next);

4
tests/check/elements/dash_mpd.c
View file

@ -5584,7 +5584,9 @@ GST_START_TEST (dash_mpdparser_xlink_period)
gst_filename_to_uri (XLINK_DOUBLE_PERIOD_FILENAME, NULL);
/* constructs inital mpd using external xml uri */
/* For invalid URI, mpdparser should be ignore it */
xml_joined = g_strjoin ("", xml_frag_start,
xml_uri_front, "http://404/ERROR/XML.period", xml_uri_rear,
xml_uri_front, (const char *) file_uri_single_period, xml_uri_rear,
xml_uri_front, (const char *) file_uri_double_period, xml_uri_rear,
xml_frag_end, NULL);
@ -5594,7 +5596,7 @@ GST_START_TEST (dash_mpdparser_xlink_period)
period_list = mpdclient->mpd_node->Periods;
/* only count periods on initial mpd (external xml does not parsed yet) */
assert_equals_int (g_list_length (period_list), 3);
assert_equals_int (g_list_length (period_list), 4);
/* process the xml data */
ret = gst_mpd_client_setup_media_presentation (mpdclient, GST_CLOCK_TIME_NONE,