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typefindfunctions: recognize SVC and MVC nal units in h264 streams

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Ensure the detection of svc and mvc as a part of h264 stream.
Once the typefinder detect a subset_sequence_parameter_set(ssps),
then each nal unit with type 14 or 20 should be detected as a
part of h264 stream thereafter.

https://bugzilla.gnome.org/show_bug.cgi?id=694346
This commit is contained in:
Sreerenj Balachandran 2013-02-21 11:38:45 +02:00 committed by Tim-Philipp Müller
parent a86ca535c8
commit 9791f0aaf1
1 changed files with 17 additions and 9 deletions
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26
gst/typefind/gsttypefindfunctions.c
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@ -2505,6 +2505,7 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
gboolean seen_idr = FALSE; gboolean seen_idr = FALSE;
gboolean seen_sps = FALSE; gboolean seen_sps = FALSE;
gboolean seen_pps = FALSE; gboolean seen_pps = FALSE;
gboolean seen_ssps = FALSE;
int nut, ref; int nut, ref;
int good = 0; int good = 0;
int bad = 0; int bad = 0;
@ -2539,18 +2540,25 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
good++; good++;
} }
} else if (nut >= 14 && nut <= 33) { } else if (nut >= 14 && nut <= 33) {
/* reserved */ if (nut == 15) {
/* Theoretically these are good, since if they exist in the seen_ssps = TRUE;
stream it merely means that a newer backwards-compatible good++;
h.264 stream. But we should be identifying that separately. */ } else if (seen_ssps && (nut == 14 || nut == 20)) {
bad++; good++;
} else {
/* reserved */
/* Theoretically these are good, since if they exist in the
stream it merely means that a newer backwards-compatible
h.264 stream. But we should be identifying that separately. */
bad++;
}
} else { } else {
/* unspecified, application specific */ /* unspecified, application specific */
/* don't consider these bad */ /* don't consider these bad */
} }
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d", good, bad, seen_pps, GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d ssps:%d", good, bad,
seen_sps, seen_idr); seen_pps, seen_sps, seen_idr, seen_ssps);
if (seen_sps && seen_pps && seen_idr && 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); gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H264_VIDEO_CAPS);
@ -2562,8 +2570,8 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
data_scan_ctx_advance (tf, &c, 1); data_scan_ctx_advance (tf, &c, 1);
} }
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d", good, bad, seen_pps, GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, idr:%d ssps=%d", good, bad,
seen_sps, seen_idr); seen_pps, seen_sps, seen_idr, seen_ssps);
if (good >= 2 && bad == 0) { if (good >= 2 && bad == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H264_VIDEO_CAPS); gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H264_VIDEO_CAPS);