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[media] vb2: drop v4l2_format argument from queue_setup

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The queue_setup callback has a void pointer that is just for V4L2
and is the pointer to the v4l2_format struct that was passed to
VIDIOC_CREATE_BUFS. The idea was that drivers would use the information
from that struct to buffers suitable for the requested format.

After the vb2 split series this pointer is now a void pointer,
which is ugly, and the reality is that all existing drivers will
effectively just look at the sizeimage field of v4l2_format.

To make this more generic the queue_setup callback is changed:
the void pointer is dropped, instead if the *num_planes argument
is 0, then use the current format size, if it is non-zero, then
it contains the number of requested planes and the sizes array
contains the requested sizes. If either is unsupported, then return
-EINVAL, otherwise use the requested size(s).

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil
2015-10-28 00:50:37 -02:00
committed by Mauro Carvalho Chehab
parent ecc2fe20e6
commit df9ecb0cad
81 changed files with 358 additions and 522 deletions
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13
Documentation/video4linux/v4l2-pci-skeleton.c
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@@ -163,11 +163,10 @@ static irqreturn_t skeleton_irq(int irq, void *dev_id)
* minimum number: many DMA engines need a minimum of 2 buffers in the
* queue and you need to have another available for userspace processing.
*/
static int queue_setup(struct vb2_queue *vq, const void *parg,
static int queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], void *alloc_ctxs[])
{
const struct v4l2_format *fmt = parg;
struct skeleton *skel = vb2_get_drv_priv(vq);
skel->field = skel->format.field;
@@ -183,12 +182,12 @@ static int queue_setup(struct vb2_queue *vq, const void *parg,
if (vq->num_buffers + *nbuffers < 3)
*nbuffers = 3 - vq->num_buffers;
if (fmt && fmt->fmt.pix.sizeimage < skel->format.sizeimage)
return -EINVAL;
*nplanes = 1;
sizes[0] = fmt ? fmt->fmt.pix.sizeimage : skel->format.sizeimage;
alloc_ctxs[0] = skel->alloc_ctx;
if (*nplanes)
return sizes[0] < skel->format.sizeimage ? -EINVAL : 0;
*nplanes = 1;
sizes[0] = skel->format.sizeimage;
return 0;
}