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gst/typefind/gsttypefindfunctions.c: Add typefinding support for h264 elementary streams.

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Original commit message from CVS:
Patch by: Josep Torra Valles <josep at fluendo dot com>
* gst/typefind/gsttypefindfunctions.c: (h264_video_type_find),
(plugin_init):
Add typefinding support for h264 elementary streams.
Fixes bug #517420.
This commit is contained in:
Josep Torra Valles 2008-02-19 11:45:56 +00:00 committed by Sebastian Dröge
parent 054842ca82
commit 58a9fd3622
2 changed files with 82 additions and 0 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2008-02-19 Sebastian Dröge <slomo@circular-chaos.org>
Patch by: Josep Torra Valles <josep at fluendo dot com>
* gst/typefind/gsttypefindfunctions.c: (h264_video_type_find),
(plugin_init):
Add typefinding support for h264 elementary streams.
Fixes bug #517420.
2008-02-18 Stefan Kost <ensonic@users.sf.net>
* configure.ac:

73
gst/typefind/gsttypefindfunctions.c
View file

@ -1527,6 +1527,76 @@ mpeg4_video_type_find (GstTypeFind * tf, gpointer unused)
}
}
/*** video/x-h264 H264 elementary video stream ***/
static GstStaticCaps h264_video_caps = GST_STATIC_CAPS ("video/x-h264");
#define H264_VIDEO_CAPS gst_static_caps_get(&h264_video_caps)
#define H264_MAX_PROBE_LENGTH (128 * 1024) /* 128kB for HD should be enough. */
static void
h264_video_type_find (GstTypeFind * tf, gpointer unused)
{
/* Stream consists of: a series of sync codes (00 00 00 01) followed
* by NALs
*/
guint8 *data = NULL;
int offset = 0;
int stat_slice = 0;
int stat_dpa = 0;
int stat_dpb = 0;
int stat_dpc = 0;
int stat_idr = 0;
int stat_sps = 0;
int stat_pps = 0;
int nut, ref;
while (offset < H264_MAX_PROBE_LENGTH) {
data = gst_type_find_peek (tf, offset, 4);
if (data && IS_MPEG_HEADER (data)) {
nut = data[3] & 0x9f; /* forbiden_zero_bit | nal_unit_type */
ref = data[3] & 0x60; /* nal_ref_idc */
/* if forbiden bit is different to 0 won't be h264 */
if (nut > 0x1f)
goto done;
/* collect statistics about the NAL types */
if (nut == 1)
stat_slice++;
else if (nut == 2)
stat_dpa++;
else if (nut == 3)
stat_dpb++;
else if (nut == 4)
stat_dpc++;
else if ((nut == 5) && (ref != 0))
stat_idr++;
else if ((nut == 7) && (ref != 0))
stat_sps++;
else if ((nut == 8) && (ref != 0))
stat_pps++;
offset += 4;
}
offset += 1;
if ((stat_slice > 4 || (stat_dpa > 4 && stat_dpb > 4 && stat_dpc > 4)) &&
stat_idr >= 1 && stat_sps >= 1 && stat_pps >= 1) {
GstCaps *caps = gst_caps_copy (H264_VIDEO_CAPS);
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM - 1, caps);
gst_caps_unref (caps);
goto done;
}
}
done:
return;
}
/*** video/mpeg video stream ***/
static GstStaticCaps mpeg_video_caps = GST_STATIC_CAPS ("video/mpeg, "
@ -2871,6 +2941,7 @@ plugin_init (GstPlugin * plugin)
};
static gchar *flv_exts[] = { "flv", NULL };
static gchar *m4v_exts[] = { "m4v", NULL };
static gchar *h264_exts[] = { "h264", "x264", "264", NULL };
static gchar *nuv_exts[] = { "nuv", NULL };
static gchar *vivo_exts[] = { "viv", NULL };
static gchar *nsf_exts[] = { "nsf", NULL };
@ -2925,6 +2996,8 @@ plugin_init (GstPlugin * plugin)
NULL);
TYPE_FIND_REGISTER (plugin, "video/mpeg4", GST_RANK_PRIMARY,
mpeg4_video_type_find, m4v_exts, MPEG_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h264", GST_RANK_PRIMARY,
h264_video_type_find, h264_exts, MPEG_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-nuv", GST_RANK_SECONDARY,
nuv_type_find, nuv_exts, NUV_CAPS, NULL, NULL);