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typefinding: detect raw h.263

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https://bugzilla.gnome.org/show_bug.cgi?id=623846
This commit is contained in:
Parthasarathi Susarla 2011-02-10 03:22:42 +11:00 committed by Tim-Philipp Müller
parent 17fddc13d2
commit 0ebc34adf9
1 changed files with 56 additions and 0 deletions
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56
gst/typefind/gsttypefindfunctions.c
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@ -2125,6 +2125,59 @@ mpeg4_video_type_find (GstTypeFind * tf, gpointer unused)
}
}
/*** video/x-h263 H263 video stream ***/
static GstStaticCaps h263_video_caps = GST_STATIC_CAPS ("video/x-h263");
#define H263_VIDEO_CAPS gst_static_caps_get(&h263_video_caps)
#define H263_MAX_PROBE_LENGTH (128 * 1024)
static void
h263_video_type_find (GstTypeFind * tf, gpointer unused)
{
DataScanCtx c = { 0, NULL, 0 };
guint64 data = 0;
guint64 psc = 0;
guint8 tr = 0;
guint format;
guint good = 0;
guint bad = 0;
while (c.offset < H263_MAX_PROBE_LENGTH) {
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 4)))
break;
/* Find the picture start code */
data = (data << 8) + c.data[0];
psc = data & 0xfffffc0000;
if (psc == 0x800000) {
/* Found PSC */
/* TR */
tr = (data & 0x3fc) >> 2;
/* Source Format */
format = tr & 0x07;
/* Now that we have a Valid PSC, check if we also have a valid PTYPE and
the Source Format, which should range between 1 and 5 */
if (((tr >> 6) == 0x2) && (format > 0 && format < 6))
good++;
else
bad++;
/* FIXME: maybe bail out early if we get mostly bad syncs ? */
}
data_scan_ctx_advance (tf, &c, 1);
}
if (good > 0 && bad == 0)
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, H263_VIDEO_CAPS);
else if (good > 2 * bad)
gst_type_find_suggest (tf, GST_TYPE_FIND_POSSIBLE, H263_VIDEO_CAPS);
return;
}
/*** video/x-h264 H264 elementary video stream ***/
static GstStaticCaps h264_video_caps =
@ -4140,6 +4193,7 @@ plugin_init (GstPlugin * plugin)
};
static const gchar *flv_exts[] = { "flv", NULL };
static const gchar *m4v_exts[] = { "m4v", NULL };
static const gchar *h263_exts[] = { "h263", "263", NULL };
static const gchar *h264_exts[] = { "h264", "x264", "264", NULL };
static const gchar *nuv_exts[] = { "nuv", NULL };
static const gchar *vivo_exts[] = { "viv", NULL };
@ -4227,6 +4281,8 @@ 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-h263", GST_RANK_SECONDARY,
h263_video_type_find, h263_exts, H263_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-h264", GST_RANK_PRIMARY,
h264_video_type_find, h264_exts, H264_VIDEO_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-nuv", GST_RANK_SECONDARY, nuv_type_find,