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V4L/DVB (12239): em28xx: fix webcam scaling 

While trying to fix an mt9v001 webcam, I noticed that HSCALE/VSCALE do
work with em28xx + webcam. The issue is that the scaling setup depends
on the number of visible rows/cols of the input image.

With mt9v011 (Silvercrest), the resolution is 640x480. So, the scaling
is different from a normal TV image (720x480 on NTSC). This were causing
a wrong scaling and a previous patch disabled scaling.

As each sensor have their different resolution setting, the xres/yres
should be adjusted accordingly with the input sensor.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-07-13 20:15:02 -03:00
parent b04fb66152
commit 5569996421
4 changed files with 18 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/media/video/em28xx/em28xx-cards.c
View File

@ -58,8 +58,6 @@ static unsigned int card[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
module_param_array(card, int, NULL, 0444);
MODULE_PARM_DESC(card, "card type");
#define MT9V011_VERSION 0x8243
/* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
static unsigned long em28xx_devused;
@ -1730,10 +1728,12 @@ static int em28xx_hint_sensor(struct em28xx *dev)
version = be16_to_cpu(version_be);
switch (version) {
case MT9V011_VERSION:
case 0x8243: /* mt9v011 640x480 1.3 Mpix sensor */
dev->model = EM2820_BOARD_SILVERCREST_WEBCAM;
sensor_name = "mt9v011";
dev->em28xx_sensor = EM28XX_MT9V011;
dev->sensor_xres = 640;
dev->sensor_yres = 480;
break;
default:
printk("Unknown Micron Sensor 0x%04x\n", be16_to_cpu(version));

5
drivers/media/video/em28xx/em28xx-core.c
View File

@ -707,10 +707,7 @@ static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
u8 mode;
/* the em2800 scaler only supports scaling down to 50% */
if (dev->board.is_webcam) {
/* FIXME: Don't use the scaler yet */
mode = 0;
} else if (dev->board.is_em2800) {
if (dev->board.is_em2800) {
mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
} else {
u8 buf[2];

16
drivers/media/video/em28xx/em28xx-video.c
View File

@ -657,8 +657,8 @@ static void get_scale(struct em28xx *dev,
unsigned int width, unsigned int height,
unsigned int *hscale, unsigned int *vscale)
{
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
unsigned int maxw = norm_maxw(dev);
unsigned int maxh = norm_maxh(dev);
*hscale = (((unsigned long)maxw) << 12) / width - 4096L;
if (*hscale >= 0x4000)
@ -726,11 +726,7 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
return -EINVAL;
}
if (dev->board.is_webcam) {
/* FIXME: This is the only supported fmt */
width = 640;
height = 480;
} else if (dev->board.is_em2800) {
if (dev->board.is_em2800) {
/* the em2800 can only scale down to 50% */
height = height > (3 * maxh / 4) ? maxh : maxh / 2;
width = width > (3 * maxw / 4) ? maxw : maxw / 2;
@ -767,12 +763,6 @@ static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
{
struct em28xx_fmt *fmt;
/* FIXME: This is the only supported fmt */
if (dev->board.is_webcam) {
width = 640;
height = 480;
}
fmt = format_by_fourcc(fourcc);
if (!fmt)
return -EINVAL;

15
drivers/media/video/em28xx/em28xx.h
View File

@ -479,6 +479,7 @@ struct em28xx {
struct em28xx_board board;
enum em28xx_sensor em28xx_sensor;
int sensor_xres, sensor_yres;
unsigned int stream_on:1; /* Locks streams */
unsigned int has_audio_class:1;
@ -760,17 +761,23 @@ static inline int em28xx_gamma_set(struct em28xx *dev, s32 val)
/*FIXME: maxw should be dependent of alt mode */
static inline unsigned int norm_maxw(struct em28xx *dev)
{
if (dev->board.is_webcam)
return dev->sensor_xres;
if (dev->board.max_range_640_480)
return 640;
else
return 720;
return 720;
}
static inline unsigned int norm_maxh(struct em28xx *dev)
{
if (dev->board.is_webcam)
return dev->sensor_yres;
if (dev->board.max_range_640_480)
return 480;
else
return (dev->norm & V4L2_STD_625_50) ? 576 : 480;
return (dev->norm & V4L2_STD_625_50) ? 576 : 480;
}
#endif