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gst/typefind/gsttypefindfunctions.c: Recognise more mpeg4 elementary video streams.

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Original commit message from CVS:
* gst/typefind/gsttypefindfunctions.c: (mpeg4_video_type_find):
Recognise more mpeg4 elementary video streams.
This commit is contained in:
Michael Smith 2006-11-03 15:44:31 +00:00
parent 82382e0b0b
commit 977b68d779
2 changed files with 35 additions and 9 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2006-11-03 Michael Smith <msmith@fluendo.com>
* gst/typefind/gsttypefindfunctions.c: (mpeg4_video_type_find):
Recognise more mpeg4 elementary video streams.
2006-11-02 Edward Hervey <edward@fluendo.com>
* gst/typefind/gsttypefindfunctions.c: (mp3_type_find_at_offset):

39
gst/typefind/gsttypefindfunctions.c
View file

@ -1292,19 +1292,40 @@ static GstStaticCaps mpeg4_video_caps = GST_STATIC_CAPS ("video/mpeg, "
static void
mpeg4_video_type_find (GstTypeFind * tf, gpointer unused)
{
/* Header is a video object start code followed by a video object layer
* start code. The last byte of this 8-byte header can be from 0x20 - 0x2F */
static const guint8 header[] = { 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01 };
/* Header consists of: a series of start codes (00 00 01 xx), some with
* associated data.
* Optionally, we start with a visual_object_sequence_start_code, followed by
* (optionally) visual_object_start_code), then the mandatory
* video_object_start_code and video_object_layer_start_code)
*/
guint8 *data = NULL;
int offset = 0;
gboolean seen_vos = FALSE;
data = gst_type_find_peek (tf, 0, 8);
while (TRUE) {
data = gst_type_find_peek (tf, offset, 4);
if (data && data[0] == 0 && data[1] == 0 && data[2] == 1) {
int sc = data[3];
if (data && memcmp (data, header, 7) == 0 &&
data[7] >= 0x20 && data[7] <= 0x2F) {
GstCaps *caps = gst_caps_copy (MPEG4_VIDEO_CAPS);
if (sc == 0xB0) /* visual_object_sequence_start_code */
offset += 5;
else if (sc == 0xB5) /* visual_object_start_code */
offset += 5;
else if (sc >= 0x00 && sc <= 0x1F) { /* video_object_start_code */
offset += 4;
seen_vos = TRUE;
} else if (sc >= 0x20 && sc <= 0x2F) { /* video_object_layer_start_code */
if (seen_vos) {
GstCaps *caps = gst_caps_copy (MPEG4_VIDEO_CAPS);
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM - 1, caps);
gst_caps_unref (caps);
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM - 1, caps);
gst_caps_unref (caps);
return;
}
} else
return;
} else
return;
}
}