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basetsmux: fix SCTE pts_adjustment with offsets

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When there are elements between the demuxer and the muxer that
introduce an offset to the running time, or when offsets are
set on pads by the application, this shift must be taken into
account when calculating the final pts_adjustement.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/913>
This commit is contained in:
Mathieu Duponchelle 2021-05-04 14:38:28 +02:00 committed by GStreamer Marge Bot
parent c3a161f287
commit c2eeb639b0
1 changed files with 11 additions and 4 deletions
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15
subprojects/gst-plugins-bad/gst/mpegtsmux/gstbasetsmux.c
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@ -1550,8 +1550,9 @@ deep_copy_sit (const GstMpegtsSCTESIT * sit)
* to the application to ensure that that is the case.
*/
static void
handle_scte35_section (GstBaseTsMux * mux, GstMpegtsSection * section,
guint64 mpeg_pts_offset, GstStructure * rtime_map)
handle_scte35_section (GstBaseTsMux * mux, GstEvent * event,
GstMpegtsSection * section, guint64 mpeg_pts_offset,
GstStructure * rtime_map)
{
GstMpegtsSCTESIT *sit;
guint i;
@ -1744,6 +1745,11 @@ handle_scte35_section (GstBaseTsMux * mux, GstMpegtsSection * section,
* - Our own 1-hour offset
*/
pts_adjust = sit->pts_adjustment + mpeg_pts_offset + TS_MUX_CLOCK_BASE;
/* Account for offsets potentially introduced between the demuxer and us */
pts_adjust +=
GSTTIME_TO_MPEGTIME (gst_event_get_running_time_offset (event));
pts_adjust &= 0x1ffffffff;
section_data = g_memdup (section->data, section->section_length);
section_data[4] |= pts_adjust >> 32;
@ -1790,7 +1796,7 @@ gst_base_ts_mux_send_event (GstElement * element, GstEvent * event)
GST_DEBUG ("Received event with mpegts section");
if (section->section_type == GST_MPEGTS_SECTION_SCTE_SIT) {
handle_scte35_section (mux, section, 0, NULL);
handle_scte35_section (mux, event, section, 0, NULL);
} else {
/* TODO: Check that the section type is supported */
tsmux_add_mpegts_si_section (mux->tsmux, section);
@ -1847,7 +1853,8 @@ gst_base_ts_mux_sink_event (GstAggregator * agg, GstAggregatorPad * agg_pad,
&rtime_map, NULL);
gst_structure_get_uint64 (s, "mpeg-pts-offset", &mpeg_pts_offset);
handle_scte35_section (mux, section, mpeg_pts_offset, rtime_map);
handle_scte35_section (mux, event, section, mpeg_pts_offset,
rtime_map);
if (rtime_map)
gst_structure_free (rtime_map);
mux->last_scte35_event_seqnum = gst_event_get_seqnum (event);