diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2012-01-01 19:35:01 (GMT) |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-01-06 11:07:49 (GMT) |
| commit | eb3fb7c9633f79077c7c650efe0edec1840926da (patch) | |
| tree | 824875bc318f736fcdd7020c909f944c7edd2c07 | |
| parent | 51e23be28418cf836287615cf78b237af13ea1b3 (diff) | |
| download | linux-eb3fb7c9633f79077c7c650efe0edec1840926da.tar.xz | |
[media] gspca: Add a need_max_bandwidth flag to sd_desc
Some cameras will pretty much entirely fill all the image buffers all the
time even though they are using compression.
This patch adds a flag to sd_desc, which drivers for such cameras can set.
When this flag is set the bandwidth calculation code will no longer
assume that the image buffer size is a worst case and less bandwidth than
imagebufsize * fps will be used on average.
This patch sets this new flag for 3 drivers:
* For spca561 (for rev12a cameras) and nw80x cams as these simply don't work
when given less bandwidth than imagebufsize * fps.
* For sn9c20x cameras, because these show severy jpeg artifacts when
given less bandwidth than imagebufsize * fps and since these are usb2
cameras there is plenty bandwidth anyways.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 3 | ||||
| -rw-r--r-- | drivers/media/video/gspca/gspca.h | 3 | ||||
| -rw-r--r-- | drivers/media/video/gspca/nw80x.c | 1 | ||||
| -rw-r--r-- | drivers/media/video/gspca/sn9c20x.c | 1 | ||||
| -rw-r--r-- | drivers/media/video/gspca/spca561.c | 1 |
5 files changed, 8 insertions, 1 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index a8643bc..b044c8a 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -638,7 +638,8 @@ static u32 which_bandwidth(struct gspca_dev *gspca_dev) bandwidth = gspca_dev->cam.cam_mode[i].sizeimage; /* if the image is compressed, estimate its mean size */ - if (bandwidth < gspca_dev->cam.cam_mode[i].width * + if (!gspca_dev->cam.needs_full_bandwidth && + bandwidth < gspca_dev->cam.cam_mode[i].width * gspca_dev->cam.cam_mode[i].height) bandwidth = bandwidth * 3 / 8; /* 0.375 */ diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h index 5f1f46c..589009f 100644 --- a/drivers/media/video/gspca/gspca.h +++ b/drivers/media/video/gspca/gspca.h @@ -69,6 +69,9 @@ struct cam { u8 bulk; /* image transfer by 0:isoc / 1:bulk */ u8 npkt; /* number of packets in an ISOC message * 0 is the default value: 32 packets */ + u8 needs_full_bandwidth;/* Set this flag to notify the bandwidth calc. + * code that the cam fills all image buffers to + * the max, even when using compression. */ }; struct gspca_dev; diff --git a/drivers/media/video/gspca/nw80x.c b/drivers/media/video/gspca/nw80x.c index 3830054..09f7db8 100644 --- a/drivers/media/video/gspca/nw80x.c +++ b/drivers/media/video/gspca/nw80x.c @@ -1764,6 +1764,7 @@ static int sd_config(struct gspca_dev *gspca_dev, webcam = 0; sd->webcam = webcam; gspca_dev->cam.ctrls = sd->ctrls; + gspca_dev->cam.needs_full_bandwidth = 1; sd->ag_cnt = -1; /* diff --git a/drivers/media/video/gspca/sn9c20x.c b/drivers/media/video/gspca/sn9c20x.c index 86e07a1..7350718 100644 --- a/drivers/media/video/gspca/sn9c20x.c +++ b/drivers/media/video/gspca/sn9c20x.c @@ -2048,6 +2048,7 @@ static int sd_config(struct gspca_dev *gspca_dev, struct cam *cam; cam = &gspca_dev->cam; + cam->needs_full_bandwidth = 1; sd->sensor = (id->driver_info >> 8) & 0xff; sd->i2c_addr = id->driver_info & 0xff; diff --git a/drivers/media/video/gspca/spca561.c b/drivers/media/video/gspca/spca561.c index 61743d4..8a6e258 100644 --- a/drivers/media/video/gspca/spca561.c +++ b/drivers/media/video/gspca/spca561.c @@ -451,6 +451,7 @@ static int sd_config(struct gspca_dev *gspca_dev, } cam = &gspca_dev->cam; + cam->needs_full_bandwidth = 1; sd->chip_revision = id->driver_info; if (sd->chip_revision == Rev012A) { |