提交 2584bc43 编写于 作者: D Devin Heitmueller 提交者: Mauro Carvalho Chehab

V4L/DVB: Fix case where fields were not at the correct start location

This patch address an arithmetic error for the case where the only remaining
content in the USB packet was the "225Axxxx" start of active video.  In cases
where that happened to be at the end of the frame, we would inject it into the
videobuf (which is incorrect).  This caused fields to be intermittently
rendered off by two pixels.

Thanks to Eugeniy Meshcheryakov for bringing this issue to my attention
Signed-off-by: NDevin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
上级 7f8eacd2
无相关合并请求
......@@ -654,12 +654,12 @@ static inline int em28xx_isoc_copy_vbi(struct em28xx *dev, struct urb *urb)
}
if (buf != NULL && dev->capture_type == 2) {
if (len > 4 && p[0] == 0x88 && p[1] == 0x88 &&
if (len >= 4 && p[0] == 0x88 && p[1] == 0x88 &&
p[2] == 0x88 && p[3] == 0x88) {
p += 4;
len -= 4;
}
if (len > 4 && p[0] == 0x22 && p[1] == 0x5a) {
if (len >= 4 && p[0] == 0x22 && p[1] == 0x5a) {
em28xx_isocdbg("Video frame %d, len=%i, %s\n",
p[2], len, (p[2] & 1) ?
"odd" : "even");
......
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