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qtmux: Set edit list to compensate DTS shift

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We shift DTS forward to avoid negative timestamps which cannot be
represented with version 0 of the CTTS table. To stick with that
version (backward compatibility), the spec recommend using an
edit list entry to move back the presentation time to where it
should be.

https://bugzilla.gnome.org/show_bug.cgi?id=751242
This commit is contained in:
Nicolas Dufresne 2015-06-19 16:45:02 -04:00 committed by Nicolas Dufresne
parent bbea34bb6e
commit feda525591
1 changed files with 29 additions and 14 deletions
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43
gst/isomp4/gstqtmux.c
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@ -2451,22 +2451,37 @@ gst_qt_mux_update_edit_lists (GstQTMux * qtmux)
for (walk = qtmux->collect->data; walk; walk = g_slist_next (walk)) {
GstCollectData *cdata = (GstCollectData *) walk->data;
GstQTPad *qtpad = (GstQTPad *) cdata;
guint32 lateness;
guint32 duration;
if (GST_CLOCK_TIME_IS_VALID (qtpad->first_ts)
&& qtpad->first_ts > qtmux->first_ts) {
lateness =
gst_util_uint64_scale_round (qtpad->first_ts - qtmux->first_ts,
qtmux->timescale, GST_SECOND);
duration = qtpad->trak->tkhd.duration;
if (GST_CLOCK_TIME_IS_VALID (qtpad->first_ts)) {
guint32 lateness = 0;
guint32 duration = qtpad->trak->tkhd.duration;
gboolean has_gap;
gboolean has_shift;
GST_DEBUG_OBJECT (qtmux, "Pad %s is a late stream by %" GST_TIME_FORMAT,
GST_PAD_NAME (qtpad->collect.pad), GST_TIME_ARGS (lateness));
atom_trak_set_elst_entry (qtpad->trak, 0, lateness, (guint32) - 1,
(guint32) (1 * 65536.0));
atom_trak_set_elst_entry (qtpad->trak, 1, duration, 0,
(guint32) (1 * 65536.0));
has_gap = (qtpad->first_ts > (qtmux->first_ts + qtpad->dts_adjustment));
has_shift = (qtpad->dts_adjustment > 0);
if (has_gap) {
GstClockTime diff;
diff = qtpad->first_ts - (qtmux->first_ts + qtpad->dts_adjustment);
lateness = gst_util_uint64_scale_round (diff,
qtmux->timescale, GST_SECOND);
GST_DEBUG_OBJECT (qtmux, "Pad %s is a late stream by %" GST_TIME_FORMAT,
GST_PAD_NAME (qtpad->collect.pad), GST_TIME_ARGS (lateness));
atom_trak_set_elst_entry (qtpad->trak, 0, lateness, (guint32) - 1,
(guint32) (1 * 65536.0));
}
if (has_gap || has_shift) {
guint32 shift = gst_util_uint64_scale_round (qtpad->dts_adjustment,
atom_trak_get_timescale (qtpad->trak), GST_SECOND);
atom_trak_set_elst_entry (qtpad->trak, 1, duration, shift,
(guint32) (1 * 65536.0));
}
/* need to add the empty time to the trak duration */
duration += lateness;