mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2025-02-20 13:06:23 +00:00
mpdparser: Implement loading of external Period nodes
The same has to be done for AdaptationSet and SegmentList nodes still. Also this does not correctly implement the semantics: by default Period (and other nodes) should only be loaded when needed, not in the very beginning. We need to implement lazy loading for them, which means adjusting gst_mpd_client_setup_media_presentation(). https://bugzilla.gnome.org/show_bug.cgi?id=752230
This commit is contained in:
Sebastian Dröge
parent
572e54574b
commit
97f5b82bf6
1 changed files with 190 additions and 13 deletions
|
|
@ -2895,14 +2895,13 @@ gst_mpdparser_clone_URL (GstURLType * url)
|
|||
* baseURLs. Takes ownership of base and returns a new base.
|
||||
*/
|
||||
static GstUri *
|
||||
combine_urls (GstUri * base, GList * list, gchar ** query,
|
||||
GstActiveStream * stream)
|
||||
combine_urls (GstUri * base, GList * list, gchar ** query, guint idx)
|
||||
{
|
||||
GstBaseURL *baseURL;
|
||||
GstUri *ret = base;
|
||||
|
||||
if (list != NULL) {
|
||||
baseURL = g_list_nth_data (list, stream->baseURL_idx);
|
||||
baseURL = g_list_nth_data (list, idx);
|
||||
if (!baseURL) {
|
||||
baseURL = list->data;
|
||||
}
|
||||
|
|
@ -2949,22 +2948,26 @@ gst_mpdparser_parse_baseURL (GstMpdClient * client, GstActiveStream * stream,
|
|||
mpd_base_uri ? client->mpd_base_uri : client->mpd_uri);
|
||||
|
||||
/* combine a BaseURL at the MPD level with the current base url */
|
||||
abs_url = combine_urls (abs_url, client->mpd_node->BaseURLs, query, stream);
|
||||
abs_url =
|
||||
combine_urls (abs_url, client->mpd_node->BaseURLs, query,
|
||||
stream->baseURL_idx);
|
||||
|
||||
/* combine a BaseURL at the Period level with the current base url */
|
||||
abs_url =
|
||||
combine_urls (abs_url, stream_period->period->BaseURLs, query, stream);
|
||||
combine_urls (abs_url, stream_period->period->BaseURLs, query,
|
||||
stream->baseURL_idx);
|
||||
|
||||
GST_DEBUG ("Current adaptation set id %i (%s)", stream->cur_adapt_set->id,
|
||||
stream->cur_adapt_set->contentType);
|
||||
/* combine a BaseURL at the AdaptationSet level with the current base url */
|
||||
abs_url =
|
||||
combine_urls (abs_url, stream->cur_adapt_set->BaseURLs, query, stream);
|
||||
combine_urls (abs_url, stream->cur_adapt_set->BaseURLs, query,
|
||||
stream->baseURL_idx);
|
||||
|
||||
/* combine a BaseURL at the Representation level with the current base url */
|
||||
abs_url =
|
||||
combine_urls (abs_url, stream->cur_representation->BaseURLs, query,
|
||||
stream);
|
||||
stream->baseURL_idx);
|
||||
|
||||
ret = gst_uri_to_string (abs_url);
|
||||
gst_uri_unref (abs_url);
|
||||
|
|
@ -3492,11 +3495,106 @@ gst_mpd_client_setup_representation (GstMpdClient * client,
|
|||
return TRUE;
|
||||
}
|
||||
|
||||
static GList *
|
||||
gst_mpd_client_fetch_external_period (GstMpdClient * client,
|
||||
GstPeriodNode * period_node, gboolean * error)
|
||||
{
|
||||
GstFragment *download;
|
||||
GstBuffer *period_buffer;
|
||||
GstMapInfo map;
|
||||
GError *err = NULL;
|
||||
xmlDocPtr doc;
|
||||
GstUri *base_uri, *uri;
|
||||
gchar *query = NULL;
|
||||
gchar *uri_string;
|
||||
GList *new_periods = NULL;
|
||||
|
||||
*error = FALSE;
|
||||
|
||||
/* ISO/IEC 23009-1:2014 5.5.3 4)
|
||||
* Remove nodes that resolve to nothing when resolving
|
||||
*/
|
||||
if (strcmp (period_node->xlink_href,
|
||||
"urn:mpeg:dash:resolve-to-zero:2013") == 0) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (!client->downloader) {
|
||||
*error = TRUE;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Build absolute URI */
|
||||
|
||||
/* Get base URI at the MPD level */
|
||||
base_uri =
|
||||
gst_uri_from_string (client->
|
||||
mpd_base_uri ? client->mpd_base_uri : client->mpd_uri);
|
||||
|
||||
/* combine a BaseURL at the MPD level with the current base url */
|
||||
base_uri = combine_urls (base_uri, client->mpd_node->BaseURLs, &query, 0);
|
||||
uri = gst_uri_from_string_with_base (base_uri, period_node->xlink_href);
|
||||
if (query)
|
||||
gst_uri_set_query_string (uri, query);
|
||||
g_free (query);
|
||||
uri_string = gst_uri_to_string (uri);
|
||||
gst_uri_unref (base_uri);
|
||||
gst_uri_unref (uri);
|
||||
|
||||
download =
|
||||
gst_uri_downloader_fetch_uri (client->downloader,
|
||||
uri_string, client->mpd_uri, TRUE, FALSE, TRUE, &err);
|
||||
g_free (uri_string);
|
||||
|
||||
if (!download) {
|
||||
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;
|
||||
}
|
||||
|
||||
period_buffer = gst_fragment_get_buffer (download);
|
||||
g_object_unref (download);
|
||||
|
||||
gst_buffer_map (period_buffer, &map, GST_MAP_READ);
|
||||
|
||||
doc =
|
||||
xmlReadMemory ((const gchar *) map.data, map.size, "noname.xml", NULL,
|
||||
XML_PARSE_NONET);
|
||||
if (doc) {
|
||||
xmlNode *root_element = xmlDocGetRootElement (doc);
|
||||
if (root_element->type != XML_ELEMENT_NODE ||
|
||||
xmlStrcmp (root_element->name, (xmlChar *) "Period") != 0) {
|
||||
xmlFreeDoc (doc);
|
||||
gst_buffer_unmap (period_buffer, &map);
|
||||
gst_buffer_unref (period_buffer);
|
||||
*error = TRUE;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
gst_mpdparser_parse_period_node (&new_periods, root_element);
|
||||
} else {
|
||||
GST_ERROR ("Failed to parse period node XML");
|
||||
gst_buffer_unmap (period_buffer, &map);
|
||||
gst_buffer_unref (period_buffer);
|
||||
*error = TRUE;
|
||||
return NULL;
|
||||
}
|
||||
gst_buffer_unmap (period_buffer, &map);
|
||||
gst_buffer_unref (period_buffer);
|
||||
|
||||
return new_periods;
|
||||
}
|
||||
|
||||
/* TODO: Implement xlink actuation onRequest properly. Currently we download
|
||||
* each external MPD immediately when iterating over the periods. We should
|
||||
* do this only when actually switching to this period.
|
||||
*/
|
||||
gboolean
|
||||
gst_mpd_client_setup_media_presentation (GstMpdClient * client)
|
||||
{
|
||||
GstStreamPeriod *stream_period;
|
||||
GstPeriodNode *period_node;
|
||||
GstClockTime start, duration;
|
||||
GList *list, *next;
|
||||
guint idx;
|
||||
|
|
@ -3517,9 +3615,51 @@ gst_mpd_client_setup_media_presentation (GstMpdClient * client)
|
|||
idx = 0;
|
||||
start = 0;
|
||||
duration = GST_CLOCK_TIME_NONE;
|
||||
for (list = g_list_first (client->mpd_node->Periods); list;
|
||||
list = g_list_next (list)) {
|
||||
period_node = (GstPeriodNode *) list->data;
|
||||
for (list = client->mpd_node->Periods; list; /* explicitly advanced below */ ) {
|
||||
GstPeriodNode *period_node = list->data;
|
||||
GstPeriodNode *next_period_node = NULL;
|
||||
|
||||
/* 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;
|
||||
|
||||
prev = list->prev;
|
||||
client->mpd_node->Periods =
|
||||
g_list_delete_link (client->mpd_node->Periods, list);
|
||||
gst_mpdparser_free_period_node (period_node);
|
||||
period_node = NULL;
|
||||
|
||||
/* Get new next node, we will insert before this */
|
||||
if (prev)
|
||||
next = prev->next;
|
||||
else
|
||||
next = client->mpd_node->Periods;
|
||||
|
||||
while (new_periods) {
|
||||
client->mpd_node->Periods =
|
||||
g_list_insert_before (client->mpd_node->Periods, next,
|
||||
new_periods->data);
|
||||
new_periods = g_list_delete_link (new_periods, new_periods);
|
||||
}
|
||||
next = NULL;
|
||||
|
||||
/* Update our iterator to the first new period if any, or the next */
|
||||
if (prev)
|
||||
list = prev->next;
|
||||
else
|
||||
list = client->mpd_node->Periods;
|
||||
|
||||
/* And try again */
|
||||
continue;
|
||||
}
|
||||
|
||||
if (period_node->start != -1) {
|
||||
/* we have a regular period */
|
||||
/* start cannot be smaller than previous start */
|
||||
|
|
@ -3551,9 +3691,44 @@ gst_mpd_client_setup_media_presentation (GstMpdClient * client)
|
|||
"The Period extends until the PeriodStart of the next Period, or until
|
||||
the end of the Media Presentation in the case of the last Period."
|
||||
*/
|
||||
if ((next = g_list_next (list)) != NULL) {
|
||||
|
||||
while ((next = g_list_next (list)) != NULL) {
|
||||
/* try to infer this period duration from the start time of the next period */
|
||||
GstPeriodNode *next_period_node = next->data;
|
||||
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;
|
||||
|
||||
client->mpd_node->Periods =
|
||||
g_list_delete_link (client->mpd_node->Periods, next);
|
||||
gst_mpdparser_free_period_node (next_period_node);
|
||||
next_period_node = NULL;
|
||||
/* Get new next node, we will insert before this */
|
||||
next = g_list_next (list);
|
||||
while (new_periods) {
|
||||
client->mpd_node->Periods =
|
||||
g_list_insert_before (client->mpd_node->Periods, next,
|
||||
new_periods->data);
|
||||
new_periods = g_list_delete_link (new_periods, new_periods);
|
||||
}
|
||||
|
||||
/* And try again, getting the next list element which is now our newly
|
||||
* inserted nodes. If any */
|
||||
} else {
|
||||
/* Got the next period and it doesn't have to be downloaded first */
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (next_period_node) {
|
||||
if (next_period_node->start != -1) {
|
||||
if (start >= next_period_node->start * GST_MSECOND) {
|
||||
/* Invalid MPD file: duration would be negative or zero */
|
||||
|
|
@ -3594,6 +3769,8 @@ gst_mpd_client_setup_media_presentation (GstMpdClient * client)
|
|||
ret = TRUE;
|
||||
GST_LOG (" - added Period %d start=%" GST_TIME_FORMAT " duration=%"
|
||||
GST_TIME_FORMAT, idx, GST_TIME_ARGS (start), GST_TIME_ARGS (duration));
|
||||
|
||||
list = list->next;
|
||||
}
|
||||
|
||||
GST_DEBUG ("Found a total of %d valid Periods in the Media Presentation",
|
||||
|
|
|
|||
Loading…
Reference in a new issue