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gst/typefind/gsttypefindfunctions.c: Fix wavpack typefinding to work in more cases (don't peek for chunks of multiple...

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Original commit message from CVS:
* gst/typefind/gsttypefindfunctions.c: (wavpack_type_find):
Fix wavpack typefinding to work in more cases (don't peek
for chunks of multiple hundred kBs at once, but process
things step-by-step in smaller units). Fixes #339786.
This commit is contained in:
Tim-Philipp Müller 2006-04-28 12:15:33 +00:00
parent ffc01d2492
commit b0091828ba
2 changed files with 52 additions and 51 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2006-04-28 Tim-Philipp Müller <tim at centricular dot net>
* gst/typefind/gsttypefindfunctions.c: (wavpack_type_find):
Fix wavpack typefinding to work in more cases (don't peek
for chunks of multiple hundred kBs at once, but process
things step-by-step in smaller units). Fixes #339786.
2006-04-28 Thomas Vander Stichele <thomas at apestaart dot org>
* configure.ac:

96
gst/typefind/gsttypefindfunctions.c
View file

@ -816,64 +816,58 @@ GST_STATIC_CAPS ("audio/x-wavpack-correction, framed = (boolean) false");
static void
wavpack_type_find (GstTypeFind * tf, gpointer unused)
{
guint8 *data = gst_type_find_peek (tf, 0, 32);
guint64 offset;
guint32 blocksize;
guint8 *data;
data = gst_type_find_peek (tf, 0, 32);
if (!data)
return;
if (data[0] == 'w' && data[1] == 'v' && data[2] == 'p' && data[3] == 'k') {
guint32 blocksize, sublen;
gint32 left;
if (data[0] != 'w' || data[1] != 'v' || data[2] != 'p' || data[3] != 'k')
return;
GST_LOG ("got wavpack header");
/* Note: wavpack blocks can be fairly large (easily 60-110k), possibly
* larger than the max. limits imposed by certain typefinding elements
* like id3demux or apedemux, so typefinding is most likely only going to
* work in pull-mode */
blocksize = GST_READ_UINT32_LE (data + 4);
GST_LOG ("wavpack header, blocksize=0x%04x", blocksize);
offset = 32;
while (offset < 32 + blocksize) {
guint32 sublen;
/* wavpack blocks can be fairly large, possibly larger than the max.
* limits imposed by certain typefinding elements like id3demux or
* apedemux. So if the first wavpack block is larger than any particular
* limit, we try to get a smaller chunk and hope we get lucky parsing
* only bits of it (case at hand: first wavpack block: 42kB, with a
* max. limit imposed by apedemux/id3demux: 40kB) */
blocksize = GST_READ_UINT32_LE (data + 4);
do {
/* peek from offset 0, otherwise it won't work with apedemux */
data = gst_type_find_peek (tf, 0, 32 + blocksize);
if (data != NULL)
break;
if (32 + blocksize < 512) /* random threshold */
break;
blocksize = (blocksize * 3) / 4;
} while (data == NULL);
if (!data)
return;
data += 32;
left = (gint32) blocksize;
while (left > 2) {
sublen = ((guint32) data[1]) << 1;
if (data[0] & 0x80) {
sublen |= (((guint32) data[2]) << 9) | (((guint32) data[3]) << 17);
sublen += 1 + 3; /* id + length */
} else {
sublen += 1 + 1; /* id + length */
}
if (sublen > blocksize)
return;
if ((data[0] & 0x20) == 0) {
switch (data[0] & 0x0f) {
case 0xa: /* ID_WV_BITSTREAM */
case 0xc: /* ID_WVX_BITSTREAM */
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, WAVPACK_CAPS);
return;
case 0xb: /* ID_WVC_BITSTREAM */
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY,
WAVPACK_CORRECTION_CAPS);
return;
default:
break;
}
}
left -= sublen;
data += sublen;
/* get chunk header */
GST_LOG ("peeking at chunk at offset 0x%04x", (guint) offset);
data = gst_type_find_peek (tf, offset, 4);
if (data == NULL)
break;
sublen = ((guint32) data[1]) << 1;
if (data[0] & 0x80) {
sublen |= (((guint32) data[2]) << 9) | (((guint32) data[3]) << 17);
sublen += 1 + 3; /* id + length */
} else {
sublen += 1 + 1; /* id + length */
}
if (sublen > blocksize - offset + 32) {
GST_LOG ("chunk length too big (%u > %u)", sublen, blocksize - offset);
break;
}
if ((data[0] & 0x20) == 0) {
switch (data[0] & 0x0f) {
case 0xa: /* ID_WV_BITSTREAM */
case 0xc: /* ID_WVX_BITSTREAM */
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY, WAVPACK_CAPS);
return;
case 0xb: /* ID_WVC_BITSTREAM */
gst_type_find_suggest (tf, GST_TYPE_FIND_LIKELY,
WAVPACK_CORRECTION_CAPS);
return;
default:
break;
}
}
offset += sublen;
}
}