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typefindfunctions: make h264 typefinder more picky when returning "likely" probability

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Only return LIKELY probability if we've seen an SPS, PPS and an
IDR slice nal, i.e. try harder to avoid false positives such
as with certain VC-1 files.

https://bugzilla.gnome.org/show_bug.cgi?id=668565
This commit is contained in:
Tim-Philipp Müller 2012-02-08 19:39:00 +00:00
parent dc08c01935
commit e832929080
1 changed files with 16 additions and 2 deletions

18
gst/typefind/gsttypefindfunctions.c
View file

@ -2402,6 +2402,9 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
/* Stream consists of: a series of sync codes (00 00 00 01) followed
* by NALs
*/
gboolean seen_idr = FALSE;
gboolean seen_sps = FALSE;
gboolean seen_pps = FALSE;
int nut, ref;
int good = 0;
int bad = 0;
@ -2426,6 +2429,13 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
((nut == 6 || (nut >= 9 && nut <= 12)) && ref != 0)) {
bad++;
} else {
if (nut == 7)
seen_sps = TRUE;
else if (nut == 8)
seen_pps = TRUE;
else if (nut == 5)
seen_idr = TRUE;
good++;
}
} else if (nut >= 14 && nut <= 33) {
@ -2439,9 +2449,10 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
/* don't consider these bad */
}
GST_DEBUG ("good %d bad %d", good, bad);
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d", good, bad, seen_pps,
seen_sps, seen_idr);
if (good >= 10 && bad < 4) {
if (seen_sps && seen_pps && seen_idr && good >= 10 && bad < 4) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H264_VIDEO_CAPS);
return;
}
@ -2451,6 +2462,9 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
data_scan_ctx_advance (tf, &c, 1);
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d", good, bad, seen_pps,
seen_sps, seen_idr);
if (good >= 2 && bad == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H264_VIDEO_CAPS);
}