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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-09 05:38:58 +00:00
dashdemux: add support for manifest file updates
- the MPD file is updated in the download loop (only if we have a "dynamic" MPD and minimumUpdatePeriod is valid); - properly LOCK/UNLOCK the GstMpdClient;
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commit
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3 changed files with 96 additions and 0 deletions
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@ -213,6 +213,7 @@ static gboolean gst_dash_demux_get_next_fragment_set (GstDashDemux * demux);
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static void gst_dash_demux_reset (GstDashDemux * demux, gboolean dispose);
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static GstClockTime gst_dash_demux_get_buffering_time (GstDashDemux * demux);
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static float gst_dash_demux_get_buffering_ratio (GstDashDemux * demux);
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static GstBuffer * gst_dash_demux_merge_buffer_list (GstFragment * fragment);
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static void
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_do_init (GType type)
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@ -1092,6 +1093,7 @@ gst_dash_demux_reset (GstDashDemux * demux, gboolean dispose)
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gst_dash_demux_clear_queue (demux);
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demux->last_manifest_update = GST_CLOCK_TIME_NONE;
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demux->position = 0;
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demux->position_shift = 0;
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demux->need_segment = TRUE;
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@ -1131,6 +1133,34 @@ gst_dash_demux_get_buffering_ratio (GstDashDemux * demux)
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return buffering_time / demux->min_buffering_time;
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}
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static GstBuffer *
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gst_dash_demux_merge_buffer_list (GstFragment *fragment)
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{
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GstBufferList *list;
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GstBufferListIterator *it;
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GstBuffer *buffer, *ret = NULL;
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GstAdapter *adapter;
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gsize size;
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adapter = gst_adapter_new ();
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list = gst_fragment_get_buffer_list (fragment);
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it = gst_buffer_list_iterate (list);
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while (gst_buffer_list_iterator_next_group (it)) {
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while ((buffer = gst_buffer_list_iterator_next (it)) != NULL) {
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gst_adapter_push (adapter, gst_buffer_ref (buffer));
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}
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}
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gst_buffer_list_iterator_free (it);
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gst_buffer_list_unref (list);
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size = gst_adapter_available (adapter);
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if (size > 0)
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ret = gst_adapter_take_buffer (adapter, size);
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GST_DEBUG ("Extracted a buffer of size %d from the fragment", size);
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g_object_unref (adapter);
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return ret;
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}
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/* gst_dash_demux_download_loop:
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*
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* Loop for the "download' task that fetches fragments based on the
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@ -1162,12 +1192,72 @@ gst_dash_demux_get_buffering_ratio (GstDashDemux * demux)
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void
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gst_dash_demux_download_loop (GstDashDemux * demux)
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{
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GstClock *clock = gst_element_get_clock (GST_ELEMENT (demux));
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gint64 update_period = demux->client->mpd_node->minimumUpdatePeriod;
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/* Wait until the next scheduled download */
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if (g_cond_timed_wait (GST_TASK_GET_COND (demux->download_task),
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demux->download_timed_lock, &demux->next_download)) {
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goto quit;
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}
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if (clock && gst_mpd_client_is_live (demux->client) && demux->client->mpd_uri != NULL && update_period != -1) {
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GstFragment *download;
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GstBuffer * buffer;
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GstClockTime duration, now = gst_clock_get_time (clock);
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/* init reference time for manifest file updates */
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if (!GST_CLOCK_TIME_IS_VALID (demux->last_manifest_update))
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demux->last_manifest_update = now;
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/* update the manifest file */
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if (now >= demux->last_manifest_update + update_period * GST_MSECOND) {
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GST_DEBUG_OBJECT (demux, "Updating manifest file from URL %s", demux->client->mpd_uri);
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download = gst_uri_downloader_fetch_uri (demux->downloader, demux->client->mpd_uri);
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if (download == NULL) {
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GST_WARNING_OBJECT (demux, "Failed to update the manifest file from URL %s", demux->client->mpd_uri);
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} else {
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buffer = gst_dash_demux_merge_buffer_list (download);
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g_object_unref (download);
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/* parse the manifest file */
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if (buffer == NULL) {
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GST_WARNING_OBJECT (demux, "Error validating the manifest.");
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} else if (!gst_mpd_parse (demux->client, (gchar *) GST_BUFFER_DATA (buffer),
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GST_BUFFER_SIZE (buffer))) {
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/* In most cases, this will happen if we set a wrong url in the
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* source element and we have received the 404 HTML response instead of
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* the manifest */
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GST_WARNING_OBJECT (demux, "Error parsing the manifest.");
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gst_buffer_unref (buffer);
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} else {
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gst_buffer_unref (buffer);
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/* setup video, audio and subtitle streams, starting from first Period */
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if (!gst_mpd_client_setup_media_presentation (demux->client) ||
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!gst_mpd_client_set_period_index (demux->client, gst_mpd_client_get_period_index (demux->client)) ||
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!gst_dash_demux_setup_all_streams (demux)) {
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GST_DEBUG_OBJECT (demux, "Error setting up the updated manifest file");
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goto end_of_manifest;
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}
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/* Send an updated duration message */
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duration = gst_mpd_client_get_media_presentation_duration (demux->client);
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if (duration != GST_CLOCK_TIME_NONE) {
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GST_DEBUG_OBJECT (demux, "Sending duration message : %" GST_TIME_FORMAT,
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GST_TIME_ARGS (duration));
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gst_element_post_message (GST_ELEMENT (demux),
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gst_message_new_duration (GST_OBJECT (demux),
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GST_FORMAT_TIME, duration));
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} else {
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GST_DEBUG_OBJECT (demux, "mediaPresentationDuration unknown, can not send the duration message");
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}
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demux->last_manifest_update += update_period * GST_MSECOND;
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GST_DEBUG_OBJECT (demux, "Manifest file successfully updated");
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}
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}
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}
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}
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/* Target buffering time MUST at least exceeds mimimum buffering time
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* by the duration of a fragment, but SHOULD NOT exceed maximum
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* buffering time */
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@ -90,6 +90,9 @@ struct _GstDashDemux
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GMutex *download_timed_lock;
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GTimeVal next_download; /* Time of the next download */
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/* Manifest update */
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GstClockTime last_manifest_update;
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/* Position in the stream */
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GstClockTime position;
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GstClockTime position_shift;
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@ -2422,6 +2422,7 @@ gst_mpd_parse (GstMpdClient * client, const gchar * data, gint size)
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GST_DEBUG ("MPD file fully buffered, start parsing...");
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GST_MPD_CLIENT_LOCK (client);
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/* parse the complete MPD file into a tree (using the libxml2 default parser API) */
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/* this initialize the library and check potential ABI mismatches
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@ -2434,6 +2435,7 @@ gst_mpd_parse (GstMpdClient * client, const gchar * data, gint size)
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doc = xmlReadMemory (data, size, "noname.xml", NULL, 0);
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if (doc == NULL) {
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GST_ERROR ("failed to parse the MPD file");
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GST_MPD_CLIENT_UNLOCK (client);
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return FALSE;
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} else {
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/* get the root element node */
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@ -2453,6 +2455,7 @@ gst_mpd_parse (GstMpdClient * client, const gchar * data, gint size)
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/* dump XML library memory for debugging */
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xmlMemoryDump ();
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}
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GST_MPD_CLIENT_UNLOCK (client);
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return TRUE;
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}
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