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typefind: Detect WebM as video/webm

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Refactor matroska_type_find into ebml_check_header and a new
matroska_type_find and webm_type_find.
This commit is contained in:
Philip Jägenstedt 2010-05-10 05:53:22 +02:00 committed by Sebastian Dröge
parent ac2d0170a8
commit 3762cfd3d7
1 changed files with 41 additions and 21 deletions
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62
gst/typefind/gsttypefindfunctions.c
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@ -2823,25 +2823,20 @@ ircam_type_find (GstTypeFind * tf, gpointer ununsed)
}
}
/*** video/x-matroska ***/
static GstStaticCaps matroska_caps = GST_STATIC_CAPS ("video/x-matroska");
#define MATROSKA_CAPS (gst_static_caps_get(&matroska_caps))
static void
matroska_type_find (GstTypeFind * tf, gpointer ununsed)
/* EBML typefind helper */
static gboolean
ebml_check_header (GstTypeFind * tf, const gchar * doctype, int doctype_len)
{
/* 4 bytes for EBML ID, 1 byte for header length identifier */
guint8 *data = gst_type_find_peek (tf, 0, 4 + 1);
gint len_mask = 0x80, size = 1, n = 1, total;
guint8 probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
if (!data)
return;
return FALSE;
/* ebml header? */
if (data[0] != 0x1A || data[1] != 0x45 || data[2] != 0xDF || data[3] != 0xA3)
return;
return FALSE;
/* length of header */
total = data[4];
@ -2850,7 +2845,7 @@ matroska_type_find (GstTypeFind * tf, gpointer ununsed)
len_mask >>= 1;
}
if (size > 8)
return;
return FALSE;
total &= (len_mask - 1);
while (n < size)
total = (total << 8) | data[4 + n++];
@ -2859,17 +2854,39 @@ matroska_type_find (GstTypeFind * tf, gpointer ununsed)
* EBML length tag and the actual header */
data = gst_type_find_peek (tf, 0, 4 + size + total);
if (!data)
return;
return FALSE;
/* the header must contain the document type 'matroska'. For now,
* we don't parse the whole header but simply check for the
* availability of that array of characters inside the header.
* Not fully fool-proof, but good enough. */
for (n = 4 + size; n <= 4 + size + total - sizeof (probe_data); n++)
if (!memcmp (&data[n], probe_data, sizeof (probe_data))) {
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MATROSKA_CAPS);
break;
}
/* the header must contain the doctype. For now, we don't parse the
* whole header but simply check for the availability of that array
* of characters inside the header. Not fully fool-proof, but good
* enough. */
for (n = 4 + size; n <= 4 + size + total - doctype_len; n++)
if (!memcmp (&data[n], doctype, doctype_len))
return TRUE;
return FALSE;
}
/*** video/x-matroska ***/
static GstStaticCaps matroska_caps = GST_STATIC_CAPS ("video/x-matroska");
#define MATROSKA_CAPS (gst_static_caps_get(&matroska_caps))
static void
matroska_type_find (GstTypeFind * tf, gpointer ununsed)
{
if (ebml_check_header (tf, "matroska", 8))
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, MATROSKA_CAPS);
}
/*** video/webm ***/
static GstStaticCaps webm_caps = GST_STATIC_CAPS ("video/webm");
#define WEBM_CAPS (gst_static_caps_get(&webm_caps))
static void
webm_type_find (GstTypeFind * tf, gpointer ununsed)
{
if (ebml_check_header (tf, "webm", 4))
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, WEBM_CAPS);
}
/*** application/mxf ***/
@ -3666,6 +3683,7 @@ plugin_init (GstPlugin * plugin)
static const gchar *bmp_exts[] = { "bmp", NULL };
static const gchar *tiff_exts[] = { "tif", "tiff", NULL };
static const gchar *matroska_exts[] = { "mkv", "mka", NULL };
static const gchar *webm_exts[] = { "webm", "weba", "webv", NULL };
static const gchar *mve_exts[] = { "mve", NULL };
static const gchar *dv_exts[] = { "dv", "dif", NULL };
static const gchar *amr_exts[] = { "amr", NULL };
@ -3853,6 +3871,8 @@ plugin_init (GstPlugin * plugin)
pnm_type_find, pnm_exts, PNM_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/x-matroska", GST_RANK_PRIMARY,
matroska_type_find, matroska_exts, MATROSKA_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "video/webm", GST_RANK_PRIMARY,
webm_type_find, webm_exts, WEBM_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "application/mxf", GST_RANK_PRIMARY,
mxf_type_find, mxf_exts, MXF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER_START_WITH (plugin, "video/x-mve", GST_RANK_SECONDARY,