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typefind: Detect JPEG2000 codestreams

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=783625
This commit is contained in:
Aaron Boxer 2017-06-12 22:57:26 -04:00 committed by Sebastian Dröge
parent 82e77844c2
commit 12c69c4cdf
1 changed files with 96 additions and 0 deletions
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96
gst/typefind/gsttypefindfunctions.c
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@ -3189,6 +3189,100 @@ jp2_type_find (GstTypeFind * tf, gpointer unused)
}
}
static GstStaticCaps jpc_caps = GST_STATIC_CAPS ("image/x-jpc");
#define JPC_CAPS gst_static_caps_get(&jpc_caps)
static void
jpc_type_find (GstTypeFind * tf, gpointer unused)
{
gboolean found_cod = FALSE;
gboolean found_qcd = FALSE;
gboolean found_sot = FALSE;
const guint8 *data;
gint offset = 0;
const guint8 soc_siz[] = { 0xff, 0x4f, 0xff, 0x51 };
#define GST_TYPE_FIND_JPC_MARKER_SOT 0xFF90
#define GST_TYPE_FIND_JPC_MARKER_COD 0xFF52
#define GST_TYPE_FIND_JPC_MARKER_QCD 0xFF5C
#define GST_TYPE_FIND_JPC_MARKER_COC 0xFF53
#define GST_TYPE_FIND_JPC_MARKER_RGN 0xFF5E
#define GST_TYPE_FIND_JPC_MARKER_QCC 0xFF5D
#define GST_TYPE_FIND_JPC_MARKER_POC 0xFF5F
#define GST_TYPE_FIND_JPC_MARKER_PLM 0xFF57
#define GST_TYPE_FIND_JPC_MARKER_PPM 0xFF60
#define GST_TYPE_FIND_JPC_MARKER_TLM 0xFF55
#define GST_TYPE_FIND_JPC_MARKER_CRG 0xFF63
#define GST_TYPE_FIND_JPC_MARKER_COM 0xFF64
#define GST_TYPE_FIND_JPC_MARKER_CBD 0xFF78
#define GST_TYPE_FIND_JPC_MARKER_MCC 0xFF75
#define GST_TYPE_FIND_JPC_MARKER_MCT 0xFF74
#define GST_TYPE_FIND_JPC_MARKER_MCO 0xFF77
/* SOC marker + SIZ marker */
if ((data = gst_type_find_peek (tf, 0, 4)) != NULL) {
if (memcmp (data, soc_siz, 4) != 0)
return;
offset += 4;
} else {
return;
}
while (!found_sot) {
/* skip actual marker data */
if ((data = gst_type_find_peek (tf, offset, 2)) != NULL) {
offset += GST_READ_UINT16_BE (data);
} else {
return;
}
/* read marker */
if ((data = gst_type_find_peek (tf, offset, 2)) != NULL) {
guint16 marker = GST_READ_UINT16_BE (data);
switch (marker) {
case GST_TYPE_FIND_JPC_MARKER_SOT:
found_sot = TRUE;
break;
case GST_TYPE_FIND_JPC_MARKER_COD:
found_cod = TRUE;
break;
case GST_TYPE_FIND_JPC_MARKER_QCD:
found_qcd = TRUE;
break;
/* optional header markers */
case GST_TYPE_FIND_JPC_MARKER_COC:
case GST_TYPE_FIND_JPC_MARKER_RGN:
case GST_TYPE_FIND_JPC_MARKER_QCC:
case GST_TYPE_FIND_JPC_MARKER_POC:
case GST_TYPE_FIND_JPC_MARKER_PLM:
case GST_TYPE_FIND_JPC_MARKER_PPM:
case GST_TYPE_FIND_JPC_MARKER_TLM:
case GST_TYPE_FIND_JPC_MARKER_CRG:
case GST_TYPE_FIND_JPC_MARKER_COM:
case GST_TYPE_FIND_JPC_MARKER_CBD:
case GST_TYPE_FIND_JPC_MARKER_MCC:
case GST_TYPE_FIND_JPC_MARKER_MCT:
case GST_TYPE_FIND_JPC_MARKER_MCO:
break;
/* unrecognized marker */
default:
return;
}
offset += 2;
} else {
return;
}
}
if (found_cod && found_qcd && found_sot)
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, JPC_CAPS);
}
/*** video/quicktime ***/
static GstStaticCaps qt_caps = GST_STATIC_CAPS ("video/quicktime");
@ -5729,6 +5823,8 @@ plugin_init (GstPlugin * plugin)
qtif_type_find, "qif,qtif,qti", QTIF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/jp2", GST_RANK_PRIMARY,
jp2_type_find, "jp2", JP2_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/x-jpc", GST_RANK_PRIMARY,
jpc_type_find, "jpc,j2k", JPC_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/mj2", GST_RANK_PRIMARY,
jp2_type_find, "mj2", MJ2_CAPS, NULL, NULL);