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matroskademux: track highest known cluster position and time

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... to use as a fallback initial duration estimate and to provide for
interpolation when scanning for position.
This commit is contained in:
Mark Nauwelaerts 2017-06-10 15:14:41 +02:00
parent 84c6aaf45b
commit 04fd953713
2 changed files with 35 additions and 3 deletions
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34
gst/matroska/matroska-demux.c
View file

@ -307,6 +307,8 @@ gst_matroska_demux_reset (GstElement * element)
demux->cluster_time = GST_CLOCK_TIME_NONE;
demux->cluster_offset = 0;
demux->next_cluster_offset = 0;
demux->stream_last_time = GST_CLOCK_TIME_NONE;
demux->last_cluster_offset = 0;
demux->index_offset = 0;
demux->seekable = FALSE;
demux->need_segment = FALSE;
@ -1837,12 +1839,12 @@ gst_matroska_demux_search_pos (GstMatroskaDemux * demux, GstClockTime time)
demux->common.state = GST_MATROSKA_READ_STATE_SCANNING;
/* estimate using start and current position */
/* estimate using start and last known cluster */
GST_OBJECT_LOCK (demux);
apos = demux->first_cluster_offset;
atime = demux->stream_start_time;
opos = demux->common.offset;
otime = demux->common.segment.position;
opos = demux->last_cluster_offset;
otime = demux->stream_last_time;
GST_OBJECT_UNLOCK (demux);
/* sanitize */
@ -4492,6 +4494,26 @@ gst_matroska_demux_parse_id (GstMatroskaDemux * demux, guint32 id,
== GST_MATROSKA_READ_STATE_HEADER)) {
demux->common.state = GST_MATROSKA_READ_STATE_DATA;
demux->first_cluster_offset = demux->common.offset;
if (!demux->streaming &&
!GST_CLOCK_TIME_IS_VALID (demux->common.segment.duration)) {
GstMatroskaIndex *last = NULL;
GST_DEBUG_OBJECT (demux,
"estimating duration using last cluster");
if ((last = gst_matroska_demux_search_pos (demux,
GST_CLOCK_TIME_NONE)) != NULL) {
demux->last_cluster_offset =
last->pos + demux->common.ebml_segment_start;
demux->stream_last_time = last->time;
demux->common.segment.duration =
demux->stream_last_time - demux->stream_start_time;
/* above estimate should not be taken all too strongly */
demux->invalid_duration = TRUE;
GST_DEBUG_OBJECT (demux,
"estimated duration as %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->common.segment.duration));
}
}
GST_DEBUG_OBJECT (demux, "signaling no more pads");
gst_element_no_more_pads (GST_ELEMENT (demux));
/* send initial segment - we wait till we know the first
@ -4523,6 +4545,12 @@ gst_matroska_demux_parse_id (GstMatroskaDemux * demux, guint32 id,
goto parse_failed;
GST_DEBUG_OBJECT (demux, "ClusterTimeCode: %" G_GUINT64_FORMAT, num);
demux->cluster_time = num;
/* track last cluster */
if (demux->cluster_offset > demux->last_cluster_offset) {
demux->last_cluster_offset = demux->cluster_offset;
demux->stream_last_time =
demux->cluster_time * demux->common.time_scale;
}
#if 0
if (demux->common.element_index) {
if (demux->common.element_index_writer_id == -1)

4
gst/matroska/matroska-demux.h
View file

@ -89,6 +89,10 @@ typedef struct _GstMatroskaDemux {
GstClockTime requested_seek_time;
guint64 seek_offset;
/* alternative duration; optionally obtained from last cluster */
guint64 last_cluster_offset;
GstClockTime stream_last_time;
/* index stuff */
gboolean seekable;
gboolean building_index;