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codecparsers: jpeg: fix and optimize scan for next marker code.

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Fix scan for next marker code when there is an odd number of filler
(0xff) bytes before the actual marker code. Also optimize the loop
to execute with fewer instructions (~10%).

This fixes parsing for Spectralfan.mov.
This commit is contained in:
Gwenole Beauchesne 2013-09-24 16:10:45 +02:00 committed by Tim-Philipp Müller
parent 41ed5c0266
commit d279e12c8f
1 changed files with 8 additions and 9 deletions
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17
gst-libs/gst/codecparsers/gstjpegparser.c
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@ -232,17 +232,16 @@ gst_jpeg_scan_for_marker_code (const guint8 * data, gsize size, guint offset)
guint i;
g_return_val_if_fail (data != NULL, -1);
g_return_val_if_fail (size > offset, -1);
for (i = offset; i < size - 1;) {
if (data[i] != 0xff)
i++;
else {
const guint8 v = data[i + 1];
if (v >= 0xc0 && v <= 0xfe)
return i;
i = offset + 1;
while (i < size) {
const guint8 v = data[i];
if (v < 0xc0)
i += 2;
}
else if (v < 0xff && data[i - 1] == 0xff)
return i - 1;
else
i++;
}
return -1;
}