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typefinding: add PNM typefinder

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Add PNM typefinder, so we can remove the one that's in the PNM plugin
in -bad (which btw uses different/wrong media types that don't match
the ones used by gdkpixbufdec) and people don't make fun of us for
loading image decoders when typefinding and playing back audio files.
This commit is contained in:
Tim-Philipp Müller 2010-01-22 01:49:38 +00:00
parent 48aa1959c8
commit 2a84cf0941
1 changed files with 101 additions and 0 deletions
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101
gst/typefind/gsttypefindfunctions.c
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@ -2580,6 +2580,104 @@ tiff_type_find (GstTypeFind * tf, gpointer ununsed)
}
}
/*** PNM ***/
static GstStaticCaps pnm_caps = GST_STATIC_CAPS ("image/x-portable-bitmap; "
"image/x-portable-graymap; image/x-portable-pixmap; "
"image/x-portable-anymap");
#define PNM_CAPS (gst_static_caps_get(&pnm_caps))
#define IS_PNM_WHITESPACE(c) \
((c) == ' ' || (c) == '\r' || (c) == '\n' || (c) == 't')
static void
pnm_type_find (GstTypeFind * tf, gpointer ununsed)
{
const gchar *media_type = NULL;
DataScanCtx c = { 0, NULL, 0 };
guint h = 0, w = 0;
if (G_UNLIKELY (!data_scan_ctx_ensure_data (tf, &c, 16)))
return;
/* see http://en.wikipedia.org/wiki/Netpbm_format */
if (c.data[0] != 'P' || c.data[1] < '1' || c.data[1] > '7' ||
!IS_PNM_WHITESPACE (c.data[2]) ||
(c.data[3] != '#' && c.data[3] < '0' && c.data[3] > '9'))
return;
switch (c.data[1]) {
case '1':
media_type = "image/x-portable-bitmap"; /* ASCII */
break;
case '2':
media_type = "image/x-portable-graymap"; /* ASCII */
break;
case '3':
media_type = "image/x-portable-pixmap"; /* ASCII */
break;
case '4':
media_type = "image/x-portable-bitmap"; /* Raw */
break;
case '5':
media_type = "image/x-portable-graymap"; /* Raw */
break;
case '6':
media_type = "image/x-portable-pixmap"; /* Raw */
break;
case '7':
media_type = "image/x-portable-anymap";
break;
default:
g_return_if_reached ();
}
/* try to extract width and height as well */
if (c.data[1] != '7') {
gchar s[64] = { 0, }
, sep1, sep2;
/* need to skip any comment lines first */
data_scan_ctx_advance (tf, &c, 3);
while (c.data[0] == '#') { /* we know there's still data left */
data_scan_ctx_advance (tf, &c, 1);
while (c.data[0] != '\n' && c.data[0] != '\r') {
if (!data_scan_ctx_ensure_data (tf, &c, 4))
return;
data_scan_ctx_advance (tf, &c, 1);
}
data_scan_ctx_advance (tf, &c, 1);
GST_LOG ("skipped comment line in PNM header");
}
if (!data_scan_ctx_ensure_data (tf, &c, 32) &&
!data_scan_ctx_ensure_data (tf, &c, 4)) {
return;
}
/* need to NUL-terminate data for sscanf */
memcpy (s, c.data, MIN (sizeof (s) - 1, c.size));
if (sscanf (s, "%u%c%u%c", &w, &sep1, &h, &sep2) == 4 &&
IS_PNM_WHITESPACE (sep1) && IS_PNM_WHITESPACE (sep2) &&
w > 0 && w < G_MAXINT && h > 0 && h < G_MAXINT) {
GST_LOG ("extracted PNM width and height: %dx%d", w, h);
} else {
w = 0;
h = 0;
}
} else {
/* FIXME: extract width + height for anymaps too */
}
if (w > 0 && h > 0) {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM, media_type,
"width", G_TYPE_INT, w, "height", G_TYPE_INT, h, NULL);
} else {
gst_type_find_suggest_simple (tf, GST_TYPE_FIND_LIKELY, media_type, NULL);
}
}
static GstStaticCaps sds_caps = GST_STATIC_CAPS ("audio/x-sds");
#define SDS_CAPS (gst_static_caps_get(&sds_caps))
@ -3486,6 +3584,7 @@ plugin_init (GstPlugin * plugin)
static gchar *mng_exts[] = { "mng", NULL };
static gchar *jng_exts[] = { "jng", NULL };
static gchar *xpm_exts[] = { "xpm", NULL };
static gchar *pnm_exts[] = { "pnm", "ppm", "pgm", "pbm", NULL };
static gchar *ras_exts[] = { "ras", NULL };
static gchar *bz2_exts[] = { "bz2", NULL };
static gchar *gz_exts[] = { "gz", NULL };
@ -3659,6 +3758,8 @@ plugin_init (GstPlugin * plugin)
bmp_exts, BMP_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/tiff", GST_RANK_PRIMARY, tiff_type_find,
tiff_exts, TIFF_CAPS, NULL, NULL);
TYPE_FIND_REGISTER (plugin, "image/x-portable-pixmap", GST_RANK_SECONDARY,
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, "application/mxf", GST_RANK_PRIMARY,