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matroskademux: Don't parse Tracks element twice

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If the tracks element was parsed from the SeekEntry, don't
parse it a second time and recreate tracks, as this
loses any tags that were read using the seek table.

If a genuinely new Tracks element is found, do read that
as it is needed for MSE support.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1798>
This commit is contained in:
Jan Schmidt 2022-02-27 02:39:28 +11:00 committed by GStreamer Marge Bot
parent d97e480dfe
commit 7efdc9c7f5
2 changed files with 12 additions and 7 deletions
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15
subprojects/gst-plugins-good/gst/matroska/matroska-demux.c
View file

@ -325,7 +325,7 @@ gst_matroska_demux_reset (GstElement * element)
demux->group_id = G_MAXUINT;
demux->clock = NULL;
demux->tracks_parsed = FALSE;
demux->tracks_ebml_offset = G_MAXUINT64;
if (demux->clusters) {
g_array_unref (demux->clusters);
@ -3400,6 +3400,7 @@ gst_matroska_demux_parse_tracks (GstMatroskaDemux * demux, GstEbmlRead * ebml)
{
GstFlowReturn ret = GST_FLOW_OK;
guint32 id;
guint64 ebml_offset = ebml->offset;
DEBUG_ELEMENT_START (demux, ebml, "Tracks");
@ -3440,7 +3441,7 @@ gst_matroska_demux_parse_tracks (GstMatroskaDemux * demux, GstEbmlRead * ebml)
}
DEBUG_ELEMENT_STOP (demux, ebml, "Tracks", ret);
demux->tracks_parsed = TRUE;
demux->tracks_ebml_offset = ebml_offset;
GST_DEBUG_OBJECT (demux, "signaling no more pads");
gst_element_no_more_pads (GST_ELEMENT (demux));
@ -5633,20 +5634,22 @@ gst_matroska_demux_parse_id (GstMatroskaDemux * demux, guint32 id,
break;
case GST_MATROSKA_ID_TRACKS:
GST_READ_CHECK (gst_matroska_demux_take (demux, read, &ebml));
if (!demux->tracks_parsed) {
if (demux->tracks_ebml_offset == G_MAXUINT64) {
ret = gst_matroska_demux_parse_tracks (demux, &ebml);
} else {
} else if (demux->tracks_ebml_offset != ebml.offset) {
/* This is a new Tracks entry, as can happen in MSE
* playback */
ret = gst_matroska_demux_update_tracks (demux, &ebml);
}
break;
case GST_MATROSKA_ID_CLUSTER:
if (G_UNLIKELY (!demux->tracks_parsed)) {
if (G_UNLIKELY (demux->tracks_ebml_offset == G_MAXUINT64)) {
if (demux->streaming) {
GST_DEBUG_OBJECT (demux, "Cluster before Track");
goto not_streamable;
} else {
ret = gst_matroska_demux_find_tracks (demux);
if (!demux->tracks_parsed)
if (demux->tracks_ebml_offset == G_MAXUINT64)
goto no_tracks;
}
}

4
subprojects/gst-plugins-good/gst/matroska/matroska-demux.h
View file

@ -68,8 +68,10 @@ typedef struct _GstMatroskaDemux {
gboolean seek_first;
/* did we parse cues/tracks/segmentinfo already? */
gboolean tracks_parsed;
GList *seek_parsed;
/* Offset of the last Tracks element parsed,
* to avoid reparsing or recreating tracks unecessarily */
guint64 tracks_ebml_offset;
/* cluster positions (optional) */
GArray *clusters;