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typefindfunctions: Refactor ftyp brands checking

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Store known brands in arrays and add a helper function to check them.

Also add all the `iso3` to `isob` ISO brands and the `hlsf` ISO
fragmented brand.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1234>
This commit is contained in:
Sebastian Dröge 2021-10-23 14:30:02 +03:00 committed by GStreamer Marge Bot
parent 66aef5ef46
commit 041bc2652b
1 changed files with 77 additions and 33 deletions
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110
subprojects/gst-plugins-base/gst/typefind/gsttypefindfunctions.c
View file

@ -3387,6 +3387,19 @@ static GstStaticCaps qt_caps = GST_STATIC_CAPS ("video/quicktime");
#define QT_CAPS gst_static_caps_get(&qt_caps)
#define STRNCMP(x,y,z) (strncmp ((char*)(x), (char*)(y), z))
static gboolean
ftyp_brand_is (const guint8 * brand, const gchar * brands[], gsize n_brands)
{
gsize i;
for (i = 0; i < n_brands; i++) {
if (STRNCMP (brand, brands[i], 4) == 0)
return TRUE;
}
return FALSE;
}
/* FIXME 0.11: go through http://www.ftyps.com/ */
static void
qt_type_find (GstTypeFind * tf, gpointer unused)
@ -3398,40 +3411,64 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
guint64 offset = 0;
guint64 size;
const gchar *variant = NULL;
static const gchar *qt_brands[] = { "qt " };
static const gchar *iso_brands[] = {
"isom",
"avc1",
"iso3",
"iso4",
"iso5",
"iso6",
"iso7",
"iso8",
"iso9",
"isoa",
"isob",
"mp42",
"mp41"
};
static const gchar *iso_fragmented_brands[] = {
"isml",
"dash",
"hlsf",
"avc3"
};
static const gchar *ccff_brands[] = { "ccff" };
static const gchar *heif_brands[] = { "mif1" };
while ((data = gst_type_find_peek (tf, offset, 12)) != NULL) {
guint64 new_offset;
if (STRNCMP (&data[4], "ftypqt ", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
break;
}
if (STRNCMP (&data[4], "ftyp", 4) == 0) {
if (ftyp_brand_is (&data[8], qt_brands, G_N_ELEMENTS (qt_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
break;
}
if (STRNCMP (&data[4], "ftypisom", 8) == 0 ||
STRNCMP (&data[4], "ftypavc1", 8) == 0 ||
STRNCMP (&data[4], "ftypmp42", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso";
break;
}
if (ftyp_brand_is (&data[8], iso_brands, G_N_ELEMENTS (iso_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso";
break;
}
if (STRNCMP (&data[4], "ftypisml", 8) == 0 ||
STRNCMP (&data[4], "ftypavc3", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso-fragmented";
break;
}
if (ftyp_brand_is (&data[8], iso_fragmented_brands,
G_N_ELEMENTS (iso_fragmented_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso-fragmented";
break;
}
if (STRNCMP (&data[4], "ftypccff", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "ccff";
break;
}
if (ftyp_brand_is (&data[8], ccff_brands, G_N_ELEMENTS (ccff_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "ccff";
break;
}
if (STRNCMP (&data[4], "ftypmif1", 8) == 0) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "heif";
break;
if (ftyp_brand_is (&data[8], heif_brands, G_N_ELEMENTS (heif_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "heif";
break;
}
}
/* top-level box/atom types that are in common with ISO base media file format */
@ -3493,20 +3530,27 @@ qt_type_find (GstTypeFind * tf, gpointer unused)
goto done;
new_offset = 12;
while (new_offset + 4 <= size) {
if (STRNCMP (&data[new_offset], "isom", 4) == 0 ||
STRNCMP (&data[new_offset], "dash", 4) == 0 ||
STRNCMP (&data[new_offset], "avc1", 4) == 0 ||
STRNCMP (&data[new_offset], "avc3", 4) == 0 ||
STRNCMP (&data[new_offset], "mp41", 4) == 0 ||
STRNCMP (&data[new_offset], "mp42", 4) == 0) {
if (ftyp_brand_is (&data[new_offset], iso_brands,
G_N_ELEMENTS (iso_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso";
goto done;
} else if (STRNCMP (&data[new_offset], "mif1", 4) == 0) {
}
if (ftyp_brand_is (&data[new_offset], iso_fragmented_brands,
G_N_ELEMENTS (iso_fragmented_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "iso-fragmented";
goto done;
}
if (ftyp_brand_is (&data[new_offset], heif_brands,
G_N_ELEMENTS (heif_brands))) {
tip = GST_TYPE_FIND_MAXIMUM;
variant = "heif";
goto done;
}
new_offset += 4;
}
}