openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

V4L/DVB (8666): gspca: Bad scanning of frames in pac7311. 

The previous change in packet scanning did not work,
Also, autogain was no more treated at interrupt level.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Jean-Francois Moine 2008-09-03 16:47:27 -03:00 committed by Mauro Carvalho Chehab
parent 9d5c1251bf
commit 8559e8da31
1 changed files with 23 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/media/video/gspca/pac7311.c
View File

@ -702,8 +702,16 @@ static void do_autogain(struct gspca_dev *gspca_dev)
static void put_jpeg_head(struct gspca_dev *gspca_dev,
struct gspca_frame *frame)
{
struct sd *sd = (struct sd *) gspca_dev;
unsigned char tmpbuf[4];
if (sd->ag_cnt >= 0) {
if (--sd->ag_cnt < 0) {
sd->ag_cnt = AG_CNT_START;
atomic_set(&sd->avg_lum, sd->lum_sum / AG_CNT_START);
atomic_set(&sd->do_gain, 1);
}
}
gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
(__u8 *) pac7311_jpeg_header,
12);
@ -727,7 +735,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
struct sd *sd = (struct sd *) gspca_dev;
int i;
#define INTER_FRAME 0x53
#define INTER_FRAME 0x53 /* eof + inter frame + sof */
#define LUM_OFFSET 0x1e /* reverse offset / start of frame */
/*
@ -746,11 +754,18 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
if (sd->tosof == 0) { /* if inside a frame */
/* check for 'ff ff ff xx' at start and at end of packet */
/* (len is always >= 3) */
/* (len is always >= 3 and xx never ff) */
switch (sd->ffnb) {
case 1:
if (data[0] != 0xff)
if (data[0] != 0xff) { /* can be '00' only */
__u8 ff;
sd->ffnb = 0;
ff = 0xff;
gspca_frame_add(gspca_dev, INTER_PACKET,
frame, &ff, 1);
break; /* keep 'ff 00' */
}
/* fall thru */
case 2:
case 3:
@ -775,16 +790,13 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
}
} else { /* outside a frame */
/*
* get the luminosity
* and go to the start of frame
*/
/* get the luminosity and go to the start of frame */
data += sd->tosof;
len -= sd->tosof;
if (sd->tosof > LUM_OFFSET)
sd->lum_sum += data[-LUM_OFFSET];
put_jpeg_head(gspca_dev, frame);
sd->tosof = 0;
put_jpeg_head(gspca_dev, frame);
}
for (i = 0; i < len; i++) {
@ -792,10 +804,9 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
continue;
switch (data[i + 1]) {
case 0xd9: /* end of frame */
i += 2;
frame = gspca_frame_add(gspca_dev,
LAST_PACKET,
frame, data, i);
frame, data, i + 2);
data += i + INTER_FRAME;
len -= i + INTER_FRAME;
i = 0;
@ -816,6 +827,8 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
break;
}
}
gspca_frame_add(gspca_dev, INTER_PACKET,
frame, data, i);
}
static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)