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tsbase: Handle more program updates

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There could be a case where the new program has the same program number as the
previous one ... but is actually located on a PID previously used for elementary
stream. In that case the program is guaranteed to not be an update of the
previous program but a completely new one.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1893>
This commit is contained in:
Edward Hervey 2021-11-02 09:20:55 +01:00 committed by GStreamer Marge Bot
parent 76543ee73a
commit a95a3ca807
1 changed files with 27 additions and 3 deletions
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30
subprojects/gst-plugins-bad/gst/mpegtsdemux/mpegtsbase.c
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@ -469,6 +469,12 @@ mpegts_base_add_program (MpegTSBase * base,
}
MPEGTS_BIT_SET (base->known_psi, pmt_pid);
/* Ensure the PMT PID was not used by some PES stream */
if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->is_pes, pmt_pid))) {
GST_DEBUG ("New program PMT PID was previously used by a PES stream");
MPEGTS_BIT_UNSET (base->is_pes, pmt_pid);
}
g_ptr_array_add (base->programs, program);
@ -1053,10 +1059,21 @@ mpegts_base_apply_pat (MpegTSBase * base, GstMpegtsSection * section)
for (i = 0; i < pat->len; ++i) {
GstMpegtsPatProgram *patp = g_ptr_array_index (pat, i);
GST_LOG ("Looking for program %d / 0x%04x", patp->program_number,
patp->network_or_program_map_PID);
program = mpegts_base_get_program (base, patp->program_number);
if (program) {
/* IF the program already existed, just check if the PMT PID changed */
if (program->pmt_pid != patp->network_or_program_map_PID) {
GST_LOG ("Program exists on pid 0x%04x", program->pmt_pid);
/* If the new PMT PID clashes with an existing known PES stream, we know
* it is not an update */
if (MPEGTS_BIT_IS_SET (base->is_pes, patp->network_or_program_map_PID)) {
GST_LOG ("Program is not an update");
program =
mpegts_base_add_program (base, patp->program_number,
patp->network_or_program_map_PID);
} else if (program->pmt_pid != patp->network_or_program_map_PID) {
/* IF the program already existed, just check if the PMT PID changed */
GST_LOG ("PMT is on a different PID");
if (program->pmt_pid != G_MAXUINT16) {
/* pmt pid changed */
/* FIXME: when this happens it may still be pmt pid of another
@ -1071,6 +1088,8 @@ mpegts_base_apply_pat (MpegTSBase * base, GstMpegtsSection * section)
("Refcounting issue. Setting twice a PMT PID (0x%04x) as know PSI",
program->pmt_pid);
MPEGTS_BIT_SET (base->known_psi, patp->network_or_program_map_PID);
} else {
GST_LOG ("Regular program update");
}
} else {
/* Create a new program */
@ -1097,9 +1116,14 @@ mpegts_base_apply_pat (MpegTSBase * base, GstMpegtsSection * section)
continue;
}
if (--program->patcount > 0)
GST_LOG ("Deactivating program %d / 0x%04x", patp->program_number,
patp->network_or_program_map_PID);
if (--program->patcount > 0) {
GST_LOG ("Referenced by new program, keeping");
/* the program has been referenced by the new pat, keep it */
continue;
}
GST_INFO_OBJECT (base, "PAT removing program 0x%04x 0x%04x",
patp->program_number, patp->network_or_program_map_PID);