From: Trent Piepho Date: Mon, 22 Oct 2007 20:44:55 +0000 (-0300) Subject: V4L/DVB (6392): bttv: Update initial image size when set via V4L1 VIDIOCMCAPTURE X-Git-Tag: v2.6.24-rc2~30^2~23 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a8ab68bffe3fe7b8e9ff963ea321d283fc77ac5f;p=linux-2.6 V4L/DVB (6392): bttv: Update initial image size when set via V4L1 VIDIOCMCAPTURE The V4L1 spec says that the image size should be with with VIDIOCSWIN before requesting buffers with VIDIOCGMBUF and capturing into them with VIDIOCMCAPTURE. But it seems that many apps don't do this. They set the size using the fields in the VIDIOCMCAPTURE ioctl. The driver doesn't know what size to capture until it actually starts to capture. In particular, it doesn't know what size to capture until it has already mmap the captured buffers. Which is quite stupid. Why V4L1 has size and format fields for VIDIOCMCAPTURE I have no idea. Many drivers don't support this, including those using v4l1-compat. The bttv does, which is probably the only reason such broken software is so prevalent. But, the driver doesn't adjust its idea of what size is being captured when it is set this way. If you try to query the driver's current setting with v4l2-ctl, it won't be correct. Signed-off-by: Trent Piepho Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c index 56e43506fe..a88b56e6ca 100644 --- a/drivers/media/video/bt8xx/bttv-driver.c +++ b/drivers/media/video/bt8xx/bttv-driver.c @@ -3113,6 +3113,8 @@ static int bttv_do_ioctl(struct inode *inode, struct file *file, vm->width,vm->height,field); if (0 != retval) goto fh_unlock_and_return; + btv->init.width = vm->width; + btv->init.height = vm->height; spin_lock_irqsave(&btv->s_lock,flags); buffer_queue(&fh->cap,&buf->vb); spin_unlock_irqrestore(&btv->s_lock,flags);