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>

1 files changed, 34 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/sonixj.c b/drivers/media/video/gspca/sonixj.c
index 363c0fa39d9e..7d0d949b72ba 100644
--- a/drivers/media/video/gspca/sonixj.c
+++ b/drivers/media/video/gspca/sonixj.c
@@ -47,6 +47,9 @@ struct sd {
         u8 vflip;                       /* ov7630/ov7648 only */
         u8 infrared;                    /* mt9v111 only */
         u8 quality;                     /* image quality */
+#define QUALITY_MIN 60
+#define QUALITY_MAX 95
+#define QUALITY_DEF 80
         u8 jpegqual;                    /* webcam quality */
 
         u8 reg18;
@@ -1295,7 +1298,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
         else
                 sd->vflip = 1;
         sd->infrared = INFRARED_DEF;
-        sd->quality = 80;
+        sd->quality = QUALITY_DEF;
         sd->jpegqual = 80;
 
         gspca_dev->ctrl_dis = ctrl_dis[sd->sensor];
@@ -2130,6 +2133,34 @@ static int sd_getinfrared(struct gspca_dev *gspca_dev, __s32 *val)
         return 0;
 }
 
+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,
@@ -2142,6 +2173,8 @@ static const struct sd_desc sd_desc = {
         .stop0 = sd_stop0,
         .pkt_scan = sd_pkt_scan,
         .dq_callback = do_autogain,
+        .get_jcomp = sd_get_jcomp,
+        .set_jcomp = sd_set_jcomp,
 };
 
 /* -- module initialisation -- */