V4L/DVB (11040): gspca - most jpeg subdrivers: Have the JPEG quality settable.
The JPEG quality of the images (quantization tables) is now settable by the
VIDIOC_S_JPEGCOMP ioctl.
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/stk014.c b/drivers/media/video/gspca/stk014.c
index dd007cb..f25be20 100644
--- a/drivers/media/video/gspca/stk014.c
+++ b/drivers/media/video/gspca/stk014.c
@@ -36,6 +36,9 @@
unsigned char colors;
unsigned char lightfreq;
u8 quality;
+#define QUALITY_MIN 60
+#define QUALITY_MAX 95
+#define QUALITY_DEF 80
u8 *jpeg_hdr;
};
@@ -301,7 +304,7 @@
sd->contrast = CONTRAST_DEF;
sd->colors = COLOR_DEF;
sd->lightfreq = FREQ_DEF;
- sd->quality = 80;
+ sd->quality = QUALITY_DEF;
return 0;
}
@@ -535,6 +538,34 @@
return -EINVAL;
}
+static int sd_set_jcomp(struct gspca_dev *gspca_dev,
+ struct v4l2_jpegcompression *jcomp)
+{
+ struct sd *sd = (struct sd *) gspca_dev;
+
+ if (jcomp->quality < QUALITY_MIN)
+ sd->quality = QUALITY_MIN;
+ else if (jcomp->quality > QUALITY_MAX)
+ sd->quality = QUALITY_MAX;
+ else
+ sd->quality = jcomp->quality;
+ if (gspca_dev->streaming)
+ jpeg_set_qual(sd->jpeg_hdr, sd->quality);
+ return 0;
+}
+
+static int sd_get_jcomp(struct gspca_dev *gspca_dev,
+ struct v4l2_jpegcompression *jcomp)
+{
+ struct sd *sd = (struct sd *) gspca_dev;
+
+ memset(jcomp, 0, sizeof *jcomp);
+ jcomp->quality = sd->quality;
+ jcomp->jpeg_markers = V4L2_JPEG_MARKER_DHT
+ | V4L2_JPEG_MARKER_DQT;
+ return 0;
+}
+
/* sub-driver description */
static const struct sd_desc sd_desc = {
.name = MODULE_NAME,
@@ -547,6 +578,8 @@
.stop0 = sd_stop0,
.pkt_scan = sd_pkt_scan,
.querymenu = sd_querymenu,
+ .get_jcomp = sd_get_jcomp,
+ .set_jcomp = sd_set_jcomp,
};
/* -- module initialisation -- */