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typefind: Add typefind function for H265

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https://bugzilla.gnome.org/show_bug.cgi?id=708680
This commit is contained in:
Sreerenj Balachandran 2013-09-24 15:51:46 +03:00 committed by Sebastian Dröge
parent f8d8a56d7b
commit ebaa714c9f
1 changed files with 95 additions and 0 deletions
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95
gst/typefind/gsttypefindfunctions.c
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@ -2685,6 +2685,99 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
}
}
/*** video/x-h265 H265 elementary video stream ***/
static GstStaticCaps h265_video_caps =
GST_STATIC_CAPS ("video/x-h265,stream-format=byte-stream");
#define H265_VIDEO_CAPS gst_static_caps_get(&h265_video_caps)
#define H265_MAX_PROBE_LENGTH (128 * 1024) /* 128kB for HD should be enough. */
static void
h265_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
/* Stream consists of: a series of sync codes (00 00 00 01) followed
* by NALs
*/
gboolean seen_irap = FALSE;
gboolean seen_vps = FALSE;
gboolean seen_sps = FALSE;
gboolean seen_pps = FALSE;
int nut;
int good = 0;
int bad = 0;
while (c.offset < H265_MAX_PROBE_LENGTH) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 5)))
break;
if (IS_MPEG_HEADER (c.data)) {
/* forbiden_zero_bit | nal_unit_type */
nut = c.data[3] & 0xfe;
/* if forbidden bit is different to 0 won't be h265 */
if (nut > 0x7e) {
bad++;
break;
}
nut = nut >> 1;
/* if nuh_layer_id is not zero or nuh_temporal_id_plus1 is zero then
* it won't be h265 */
if ((c.data[3] & 0x01) || (c.data[4] & 0xf8) || !(c.data[4] & 0x07)) {
bad++;
break;
}
/* collect statistics about the NAL types */
if ((nut >= 0 && nut <= 9) || (nut >= 16 && nut <= 21) || (nut >= 32
&& nut <= 40)) {
if (nut == 32)
seen_vps = TRUE;
else if (nut == 33)
seen_sps = TRUE;
else if (nut == 34)
seen_pps = TRUE;
else if (nut >= 16 || nut <= 21) {
/* BLA, IDR and CRA pictures are belongs to be IRAP picture */
/* we are not counting the reserved IRAP pictures (22 and 23) to good */
seen_irap = TRUE;
}
good++;
} else if ((nut >= 10 && nut <= 15) || (nut >= 22 && nut <= 31)
|| (nut >= 41 && nut <= 47)) {
/* reserved values are counting as bad */
bad++;
} else {
/* unspecified (48..63), application specific */
/* don't consider these as bad */
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, vps:%d, irap:%d", good, bad,
seen_pps, seen_sps, seen_vps, seen_irap);
if (seen_sps && seen_pps && seen_irap && good >= 10 && bad < 4) {
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H265_VIDEO_CAPS);
return;
}
data_scan_ctx_advance (tf, &c, 5);
}
data_scan_ctx_advance (tf, &c, 1);
}
GST_LOG ("good:%d, bad:%d, pps:%d, sps:%d, vps:%d, irap:%d", good, bad,
seen_pps, seen_sps, seen_vps, seen_irap);
if (good >= 2 && bad == 0) {
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H265_VIDEO_CAPS);
}
}
/*** video/mpeg video stream ***/
static GstStaticCaps mpeg_video_caps = GST_STATIC_CAPS ("video/mpeg, "
@ -5365,6 +5458,8 @@ plugin_init (GstPlugin * plugin)
h263_video_type_find, "h263,263", H263_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h264", GST_RANK_PRIMARY,
h264_video_type_find, "h264,x264,264", H264_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h265", GST_RANK_PRIMARY,
h265_video_type_find, "h265,x265,265", H265_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-nuv", GST_RANK_SECONDARY, nuv_type_find,
"nuv", NUV_CAPS, NULL, NULL);