mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-18 15:51:11 +00:00
dashdemux: reworked the API to retrieve fragment timestamp, fragment duration and media presentation duration
This was necessary to support variable-duration Fragments. in the new API: - gst_mpd_client_get_current_position returns the timestamp of the NEXT fragment to download; - gst_mpd_client_get_next_fragment_duration returns the duration of the next fragment to download; - gst_mpd_client_get_media_presentation_duration returns the mediaPresentationDuration from the MPD file; also there is a new internal parser function: - gst_mpd_client_get_segment_duration extracts the constant segment duration from the MPD file (only used when there is no SegmentTimeline syntax element in the current representation) In gst_mpd_client_get_next_fragment, we set the timestamp/duration of the fragment just downloaded copying the values from the corresponding GstMediaSegment. TODO: rework SEEKING to support seeking across different Periods.
This commit is contained in:
Gianluca Gennari
Thiago Santos
parent
dc5d7d258e
commit
9387365fc9
3 changed files with 82 additions and 62 deletions
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@ -507,6 +507,7 @@ gst_dash_demux_src_event (GstPad * pad, GstEvent * event)
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GST_MPD_CLIENT_LOCK (demux->client);
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stream = gst_mpdparser_get_active_stream_by_index (demux->client, 0);
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/* FIXME: support seeking across periods */
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current_pos = 0;
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target_pos = (GstClockTime) start;
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for (walk = stream->segments; walk; walk = walk->next) {
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@ -551,6 +552,7 @@ gst_dash_demux_src_event (GstPad * pad, GstEvent * event)
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GST_MPD_CLIENT_LOCK (demux->client);
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GST_DEBUG_OBJECT (demux, "Seeking to sequence %d", current_sequence);
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/* FIXME: support seeking across periods */
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stream_idx = 0;
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/* Update the current sequence on all streams */
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while (stream_idx < nb_active_stream) {
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@ -562,7 +564,7 @@ gst_dash_demux_src_event (GstPad * pad, GstEvent * event)
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stream_idx++;
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}
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/* Calculate offset in the next fragment */
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gst_mpd_client_get_current_position (demux->client, &demux->position);
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demux->position = gst_mpd_client_get_current_position (demux->client);
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demux->position_shift = start - demux->position;
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demux->need_segment = TRUE;
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GST_MPD_CLIENT_UNLOCK (demux->client);
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@ -685,7 +687,7 @@ gst_dash_demux_sink_event (GstPad * pad, GstEvent * event)
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return FALSE;
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/* Send duration message */
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if (!gst_mpd_client_is_live (demux->client)) {
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GstClockTime duration = gst_mpd_client_get_duration (demux->client);
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GstClockTime 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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@ -731,7 +733,7 @@ gst_dash_demux_src_query (GstPad * pad, GstQuery * query)
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gst_query_parse_duration (query, &fmt, NULL);
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if (fmt == GST_FORMAT_TIME) {
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duration = gst_mpd_client_get_duration (dashdemux->client);
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duration = gst_mpd_client_get_media_presentation_duration (dashdemux->client);
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if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0) {
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gst_query_set_duration (query, GST_FORMAT_TIME, duration);
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ret = TRUE;
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@ -752,7 +754,7 @@ gst_dash_demux_src_query (GstPad * pad, GstQuery * query)
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if (fmt == GST_FORMAT_TIME) {
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GstClockTime duration;
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duration = gst_mpd_client_get_duration (dashdemux->client);
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duration = gst_mpd_client_get_media_presentation_duration (dashdemux->client);
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if (GST_CLOCK_TIME_IS_VALID (duration) && duration > 0)
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stop = duration;
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@ -1151,7 +1153,7 @@ gst_dash_demux_download_loop (GstDashDemux * demux)
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* buffering time */
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GstClockTime target_buffering_time =
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demux->min_buffering_time +
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gst_mpd_client_get_target_duration (demux->client);
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gst_mpd_client_get_next_fragment_duration (demux->client);
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if (demux->max_buffering_time > target_buffering_time)
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target_buffering_time = demux->max_buffering_time;
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if (!demux->end_of_manifest
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@ -83,6 +83,7 @@ static gchar *gst_mpdparser_get_initializationURL (GstURLType *InitializationURL
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static gchar *gst_mpdparser_build_URL_from_template (const gchar *url_template, const gchar *id, guint number, guint bandwidth, guint time);
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static gboolean gst_mpd_client_add_media_segment (GstActiveStream *stream, GstSegmentURLNode *url_node, guint number, guint start, GstClockTime start_time, GstClockTime duration);
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static const gchar *gst_mpdparser_mimetype_to_caps (const gchar * mimeType);
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static GstClockTime gst_mpd_client_get_segment_duration (GstMpdClient * client);
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/* Adaptation Set */
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static GstAdaptationSetNode *gst_mpdparser_get_first_adapt_set_with_mimeType (GList *AdaptationSets, const gchar *mimeType);
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@ -2331,6 +2332,40 @@ gst_mpdparser_parse_baseURL (GstMpdClient * client)
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return ret;
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}
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static GstClockTime
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gst_mpd_client_get_segment_duration (GstMpdClient * client)
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{
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GstActiveStream *stream;
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GstStreamPeriod *stream_period;
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GstMultSegmentBaseType *base = NULL;
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GstClockTime duration;
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guint timescale;
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stream = gst_mpdparser_get_active_stream_by_index (client, client->stream_idx);
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g_return_val_if_fail (stream != NULL, GST_CLOCK_TIME_NONE);
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stream_period = gst_mpdparser_get_stream_period (client);
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g_return_val_if_fail (stream_period != NULL, GST_CLOCK_TIME_NONE);
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if (stream->cur_segment_list) {
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base = stream->cur_segment_list->MultSegBaseType;
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} else if (stream->cur_seg_template) {
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base = stream->cur_seg_template->MultSegBaseType;
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}
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if (base == NULL || base->SegBaseType == NULL) {
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/* this may happen when we have a single segment */
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duration = stream_period->duration;
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} else {
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duration = base->duration * GST_SECOND;
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timescale = base->SegBaseType->timescale;
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if (timescale > 1)
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duration /= timescale;
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}
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return duration;
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}
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/*****************************/
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/******* API functions *******/
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/*****************************/
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@ -2504,7 +2539,10 @@ gst_mpd_client_setup_representation (GstMpdClient * client, GstActiveStream *str
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g_return_val_if_fail (stream_period->period != NULL, FALSE);
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PeriodStart = stream_period->start;
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PeriodEnd = stream_period->start + stream_period->duration;
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if (GST_CLOCK_TIME_IS_VALID (stream_period->duration))
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PeriodEnd = stream_period->start + stream_period->duration;
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else
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PeriodEnd = GST_CLOCK_TIME_NONE;
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GST_LOG ("Building segment list for Period from %" GST_TIME_FORMAT " to %"
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GST_TIME_FORMAT, GST_TIME_ARGS (PeriodStart), GST_TIME_ARGS (PeriodEnd));
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@ -2573,7 +2611,9 @@ gst_mpd_client_setup_representation (GstMpdClient * client, GstActiveStream *str
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}
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}
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} else {
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duration = gst_mpd_client_get_target_duration (client);
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duration = gst_mpd_client_get_segment_duration (client);
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if (!GST_CLOCK_TIME_IS_VALID (duration))
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return FALSE;
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while (SegmentURL) {
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if (!gst_mpd_client_add_media_segment (stream, SegmentURL->data, i, 0, start_time, duration)) {
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@ -2638,7 +2678,9 @@ gst_mpd_client_setup_representation (GstMpdClient * client, GstActiveStream *str
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}
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}
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} else {
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duration = gst_mpd_client_get_target_duration (client);
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duration = gst_mpd_client_get_segment_duration (client);
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if (!GST_CLOCK_TIME_IS_VALID (duration) || !GST_CLOCK_TIME_IS_VALID (PeriodEnd))
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return FALSE;
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while (PeriodStart + start_time < PeriodEnd) {
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if (!gst_mpd_client_add_media_segment (stream, NULL, i, 0, start_time, duration)) {
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@ -2653,7 +2695,7 @@ gst_mpd_client_setup_representation (GstMpdClient * client, GstActiveStream *str
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/* check duration of last segment */
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last_media_segment = g_list_last (stream->segments)->data;
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if (last_media_segment) {
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if (last_media_segment && GST_CLOCK_TIME_IS_VALID (PeriodEnd)) {
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if (last_media_segment->start_time + last_media_segment->duration > PeriodEnd) {
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last_media_segment->duration = PeriodEnd - last_media_segment->start_time;
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GST_LOG ("Fixed duration of last segment: %" GST_TIME_FORMAT, GST_TIME_ARGS (last_media_segment->duration));
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@ -2908,12 +2950,9 @@ gst_mpd_client_get_next_fragment (GstMpdClient * client,
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stream->cur_representation->id, currentChunk->number, stream->cur_representation->bandwidth, currentChunk->start);
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}
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gst_mpd_client_get_current_position (client, timestamp);
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*duration = gst_mpd_client_get_target_duration (client);
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//*timestamp = currentChunk->start_time;
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//*duration = currentChunk->duration;
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*timestamp = currentChunk->start_time;
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*duration = currentChunk->duration;
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*discontinuity = stream->segment_idx != currentChunk->number;
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stream->segment_idx += 1;
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if (mediaURL == NULL) {
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/* single segment with URL encoded in the baseURL syntax element */
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*uri = g_strdup (gst_mpdparser_get_baseURL (client));
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@ -2923,6 +2962,7 @@ gst_mpd_client_get_next_fragment (GstMpdClient * client,
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} else {
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*uri = mediaURL;
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}
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stream->segment_idx += 1;
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GST_MPD_CLIENT_UNLOCK (client);
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GST_DEBUG ("Loading chunk with URL %s", *uri);
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@ -2965,24 +3005,37 @@ gst_mpd_client_get_next_header (GstMpdClient * client, const gchar **uri, guint
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return *uri == NULL ? FALSE : TRUE;
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}
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void
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gst_mpd_client_get_current_position (GstMpdClient * client,
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GstClockTime * timestamp)
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GstClockTime
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gst_mpd_client_get_current_position (GstMpdClient * client)
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{
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GstActiveStream *stream;
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GstClockTime duration;
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*timestamp = GST_CLOCK_TIME_NONE;
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GstMediaSegment *media_segment;
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stream = g_list_nth_data (client->active_streams, client->stream_idx);
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g_return_if_fail (stream != NULL);
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g_return_val_if_fail (stream != NULL, GST_CLOCK_TIME_NONE);
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duration = gst_mpd_client_get_target_duration (client);
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*timestamp = duration == GST_CLOCK_TIME_NONE ? GST_CLOCK_TIME_NONE : stream->segment_idx * duration;
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media_segment = g_list_nth_data (stream->segments, stream->segment_idx);
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g_return_val_if_fail (media_segment != NULL, GST_CLOCK_TIME_NONE);
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return media_segment->start_time;
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}
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GstClockTime
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gst_mpd_client_get_duration (GstMpdClient * client)
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gst_mpd_client_get_next_fragment_duration (GstMpdClient * client)
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{
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GstActiveStream *stream;
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GstMediaSegment *media_segment;
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stream = g_list_nth_data (client->active_streams, client->stream_idx);
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g_return_val_if_fail (stream != NULL, 0);
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media_segment = g_list_nth_data (stream->segments, stream->segment_idx);
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return media_segment == NULL ? 0 : media_segment->duration;
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}
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GstClockTime
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gst_mpd_client_get_media_presentation_duration (GstMpdClient * client)
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{
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GstClockTime duration;
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@ -3000,41 +3053,6 @@ gst_mpd_client_get_duration (GstMpdClient * client)
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return duration;
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}
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GstClockTime
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gst_mpd_client_get_target_duration (GstMpdClient * client)
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{
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GstActiveStream *stream;
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GstStreamPeriod *stream_period;
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GstMultSegmentBaseType *base = NULL;
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GstClockTime duration;
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guint timescale;
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stream = gst_mpdparser_get_active_stream_by_index (client, client->stream_idx);
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g_return_val_if_fail (stream != NULL, GST_CLOCK_TIME_NONE);
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stream_period = gst_mpdparser_get_stream_period (client);
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g_return_val_if_fail (stream_period != NULL, GST_CLOCK_TIME_NONE);
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if (stream->cur_segment_list) {
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base = stream->cur_segment_list->MultSegBaseType;
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} else if (stream->cur_seg_template) {
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base = stream->cur_seg_template->MultSegBaseType;
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}
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if (base == NULL || base->SegBaseType == NULL) {
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/* this may happen when we have a single segment */
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/* TODO: support SegmentTimeline */
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duration = stream_period->duration;
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} else {
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duration = base->duration * GST_SECOND;
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timescale = base->SegBaseType->timescale;
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if (timescale > 1)
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duration /= timescale;
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}
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return duration;
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}
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gboolean
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gst_mpd_client_get_next_period (GstMpdClient *client)
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{
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@ -467,9 +467,9 @@ gboolean gst_mpd_parse (GstMpdClient *client, const gchar *data, gint size);
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gboolean gst_mpd_client_setup_media_presentation (GstMpdClient *client);
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gboolean gst_mpd_client_setup_streaming (GstMpdClient *client, GstStreamMimeType mimeType, gchar* lang);
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gboolean gst_mpd_client_setup_representation (GstMpdClient *client, GstActiveStream *stream, GstRepresentationNode *representation);
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void gst_mpd_client_get_current_position (GstMpdClient *client, GstClockTime * timestamp);
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GstClockTime gst_mpd_client_get_duration (GstMpdClient *client);
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GstClockTime gst_mpd_client_get_target_duration (GstMpdClient *client);
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GstClockTime gst_mpd_client_get_current_position (GstMpdClient *client);
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GstClockTime gst_mpd_client_get_next_fragment_duration (GstMpdClient * client);
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GstClockTime gst_mpd_client_get_media_presentation_duration (GstMpdClient *client);
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gboolean gst_mpd_client_get_next_fragment (GstMpdClient *client, guint indexStream, gboolean *discontinuity, gchar **uri, GstClockTime *duration, GstClockTime *timestamp);
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gboolean gst_mpd_client_get_next_header (GstMpdClient *client, const gchar **uri, guint stream_idx);
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gboolean gst_mpd_client_is_live (GstMpdClient * client);
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