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[media] gspca - sonixj: Move the avg lum computation to a separate function

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Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean-François Moine
2011-02-10 07:01:30 -03:00
committed by Mauro Carvalho Chehab
parent d39155d91d
commit 0f77f40c30
1 changed files with 26 additions and 18 deletions
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44
drivers/media/video/gspca/sonixj.c
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@@ -2757,6 +2757,29 @@ static void do_autogain(struct gspca_dev *gspca_dev)
} }
} }
/* set the average luminosity from an isoc marker */
static void set_lum(struct sd *sd,
u8 *data)
{
int avg_lum;
/* w0 w1 w2
* w3 w4 w5
* w6 w7 w8
*/
avg_lum = (data[27] << 8) + data[28] /* w3 */
+ (data[31] << 8) + data[32] /* w5 */
+ (data[23] << 8) + data[24] /* w1 */
+ (data[35] << 8) + data[36] /* w7 */
+ (data[29] << 10) + (data[30] << 2); /* w4 * 4 */
avg_lum >>= 10;
atomic_set(&sd->avg_lum, avg_lum);
}
/* scan the URB packets */ /* scan the URB packets */
/* This function is run at interrupt level. */ /* This function is run at interrupt level. */
static void sd_pkt_scan(struct gspca_dev *gspca_dev, static void sd_pkt_scan(struct gspca_dev *gspca_dev,
@@ -2764,7 +2787,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
int len) /* iso packet length */ int len) /* iso packet length */
{ {
struct sd *sd = (struct sd *) gspca_dev; struct sd *sd = (struct sd *) gspca_dev;
int sof, avg_lum; int sof;
/* the image ends on a 64 bytes block starting with /* the image ends on a 64 bytes block starting with
* ff d9 ff ff 00 c4 c4 96 * ff d9 ff ff 00 c4 c4 96
@@ -2795,23 +2818,8 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
/* end of image found - remove the trailing data */ /* end of image found - remove the trailing data */
gspca_dev->image_len = sof + 2; gspca_dev->image_len = sof + 2;
gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0); gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
if (sd->ag_cnt < 0) if (sd->ag_cnt >= 0)
return; set_lum(sd, data + sof + 2);
/* w1 w2 w3 */
/* w4 w5 w6 */
/* w7 w8 */
/* w4 */
avg_lum = ((data[sof + 29] << 8) | data[sof + 30]) >> 6;
/* w6 */
avg_lum += ((data[sof + 33] << 8) | data[sof + 34]) >> 6;
/* w2 */
avg_lum += ((data[sof + 25] << 8) | data[sof + 26]) >> 6;
/* w8 */
avg_lum += ((data[sof + 37] << 8) | data[sof + 38]) >> 6;
/* w5 */
avg_lum += ((data[sof + 31] << 8) | data[sof + 32]) >> 4;
avg_lum >>= 4;
atomic_set(&sd->avg_lum, avg_lum);
} }
static int sd_set_jcomp(struct gspca_dev *gspca_dev, static int sd_set_jcomp(struct gspca_dev *gspca_dev,