diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2012-01-01 23:35:01 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-01-06 15:07:49 +0400 |
| commit | eb3fb7c9633f79077c7c650efe0edec1840926da (patch) | |
| tree | 824875bc318f736fcdd7020c909f944c7edd2c07 /drivers/media/video/gspca/gspca.c | |
| 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>
Diffstat (limited to 'drivers/media/video/gspca/gspca.c')
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index a8643bcd2ecb..b044c8a10a1d 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 */ |