Hi Hans and R?mi,
On Thu, Aug 02, 2012 at 08:35:58AM +0200, Hans Verkuil wrote:
...
> Minimum or maximum? The maximum is 32, that's hardcoded in the V4L2 core.
As far as I understand, V4L1 did have that limitation, as well as videobuf1
and 2 and a number of other drivers, but it's not found in
On Wed 8 August 2012 11:35:38 Sakari Ailus wrote:
> Hi Hans and R?mi,
>
> On Thu, Aug 02, 2012 at 08:35:58AM +0200, Hans Verkuil wrote:
> ...
> > Minimum or maximum? The maximum is 32, that's hardcoded in the V4L2 core.
>
> As far as I understand, V4L1 did have that limitation, as well as
On Wed 8 August 2012 11:35:38 Sakari Ailus wrote:
Hi Hans and Rémi,
On Thu, Aug 02, 2012 at 08:35:58AM +0200, Hans Verkuil wrote:
...
Minimum or maximum? The maximum is 32, that's hardcoded in the V4L2 core.
As far as I understand, V4L1 did have that limitation, as well as videobuf1
and
Hi Hans and Rémi,
On Thu, Aug 02, 2012 at 08:35:58AM +0200, Hans Verkuil wrote:
...
Minimum or maximum? The maximum is 32, that's hardcoded in the V4L2 core.
As far as I understand, V4L1 did have that limitation, as well as videobuf1
and 2 and a number of other drivers, but it's not found in
Hi Hans,
On Thursday 02 August 2012 09:08:18 Hans Verkuil wrote:
> On Thu August 2 2012 08:56:43 R?mi Denis-Courmont wrote:
> > Le jeudi 2 ao?t 2012 09:35:58 Hans Verkuil, vous avez ?crit :
> > > On Wed August 1 2012 22:49:57 R?mi Denis-Courmont wrote:
> > > > > What about using the CREATE_BUFS
Hi R?mi,
On Thursday 02 August 2012 09:56:43 R?mi Denis-Courmont wrote:
> Le jeudi 2 ao?t 2012 09:35:58 Hans Verkuil, vous avez ?crit :
> > On Wed August 1 2012 22:49:57 R?mi Denis-Courmont wrote:
> > > > What about using the CREATE_BUFS ioctl to add new MMAP buffers at
> > > > runtime ?
> > >
>
Le jeudi 2 ao?t 2012 09:35:58 Hans Verkuil, vous avez ?crit :
> On Wed August 1 2012 22:49:57 R?mi Denis-Courmont wrote:
> > > What about using the CREATE_BUFS ioctl to add new MMAP buffers at
> > > runtime ?
> >
> > Does CREATE_BUFS always work while already streaming has already started?
> > If
On Thu August 2 2012 08:56:43 R?mi Denis-Courmont wrote:
> Le jeudi 2 ao?t 2012 09:35:58 Hans Verkuil, vous avez ?crit :
> > On Wed August 1 2012 22:49:57 R?mi Denis-Courmont wrote:
> > > > What about using the CREATE_BUFS ioctl to add new MMAP buffers at
> > > > runtime ?
> > >
> > > Does
On Wed August 1 2012 22:49:57 R?mi Denis-Courmont wrote:
> Le mercredi 1 ao?t 2012 14:35:03 Laurent Pinchart, vous avez ?crit :
> > > But in general, the V4L element in the pipeline does not know how fast
> > > the downstream element(s) will consume the buffers. Thus it has to copy
> > > from the
Le mercredi 1 ao?t 2012 14:35:03 Laurent Pinchart, vous avez ?crit :
> > But in general, the V4L element in the pipeline does not know how fast
> > the downstream element(s) will consume the buffers. Thus it has to copy
> > from the MMAP buffers into anonymous user memory pending processing.
> >
On Wed August 1 2012 22:49:57 Rémi Denis-Courmont wrote:
Le mercredi 1 août 2012 14:35:03 Laurent Pinchart, vous avez écrit :
But in general, the V4L element in the pipeline does not know how fast
the downstream element(s) will consume the buffers. Thus it has to copy
from the MMAP
On Thu August 2 2012 08:56:43 Rémi Denis-Courmont wrote:
Le jeudi 2 août 2012 09:35:58 Hans Verkuil, vous avez écrit :
On Wed August 1 2012 22:49:57 Rémi Denis-Courmont wrote:
What about using the CREATE_BUFS ioctl to add new MMAP buffers at
runtime ?
Does CREATE_BUFS always work
Hi Rémi,
On Thursday 02 August 2012 09:56:43 Rémi Denis-Courmont wrote:
Le jeudi 2 août 2012 09:35:58 Hans Verkuil, vous avez écrit :
On Wed August 1 2012 22:49:57 Rémi Denis-Courmont wrote:
What about using the CREATE_BUFS ioctl to add new MMAP buffers at
runtime ?
Does
Hi Hans,
On Thursday 02 August 2012 09:08:18 Hans Verkuil wrote:
On Thu August 2 2012 08:56:43 Rémi Denis-Courmont wrote:
Le jeudi 2 août 2012 09:35:58 Hans Verkuil, vous avez écrit :
On Wed August 1 2012 22:49:57 Rémi Denis-Courmont wrote:
What about using the CREATE_BUFS ioctl to add
Le jeudi 2 août 2012 09:35:58 Hans Verkuil, vous avez écrit :
On Wed August 1 2012 22:49:57 Rémi Denis-Courmont wrote:
What about using the CREATE_BUFS ioctl to add new MMAP buffers at
runtime ?
Does CREATE_BUFS always work while already streaming has already started?
If it depends
Hi R?mi,
On Wednesday 01 August 2012 10:37:02 R?mi Denis-Courmont wrote:
> On Tue, 31 Jul 2012 23:52:35 +0200, Laurent Pinchart wrote:
> >> I want to receive the video buffers in user space for processing.
> >> Typically "processing" is software encoding or conversion. That's what
> >> virtually
Hi Hans,
>>
>> I do not see any good point in using v4l2_plane. What would be the meaning
>> of bytesused, length, data_offset in case of DMABUF exporting?
>>
>> The field reserved0 was introduced to be replaced by __u32 memory if other
>> means
>> of buffer description would be needed. The
On Tue, 31 Jul 2012 23:52:35 +0200, Laurent Pinchart
wrote:
>> I want to receive the video buffers in user space for processing.
>> Typically
>> "processing" is software encoding or conversion. That's what virtually
>> any
>> V4L application does on the desktop...
>
> But what prevents you from
On Wed 1 August 2012 10:01:45 Tomasz Stanislawski wrote:
> Hi Hans,
>
> On 07/31/2012 02:11 PM, Hans Verkuil wrote:
> > On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
> >> Hi Hans,
> >>
> >> On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
> >>> On Thu June 14 2012 16:32:23 Tomasz
Hi Tomasz,
On Wednesday 01 August 2012 10:01:45 Tomasz Stanislawski wrote:
> On 07/31/2012 02:11 PM, Hans Verkuil wrote:
> > On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
> >> On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
> >>> On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
Hi Hans,
On 07/31/2012 02:11 PM, Hans Verkuil wrote:
> On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
>> Hi Hans,
>>
>> On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
>>> On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
+/**
+ * struct v4l2_exportbuffer - export of
Hi R?mi,
On Tuesday 31 July 2012 21:39:40 R?mi Denis-Courmont wrote:
> Le mardi 31 juillet 2012 19:28:12 Laurent Pinchart, vous avez ?crit :
> > On Tuesday 31 July 2012 16:39:00 R?mi Denis-Courmont wrote:
> > > Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
> > > > > For
Hi Tomasz,
On Wednesday 01 August 2012 10:01:45 Tomasz Stanislawski wrote:
On 07/31/2012 02:11 PM, Hans Verkuil wrote:
On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
+/**
Hi Hans,
On 07/31/2012 02:11 PM, Hans Verkuil wrote:
On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
Hi Hans,
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
+/**
+ * struct v4l2_exportbuffer - export of video buffer as
On Wed 1 August 2012 10:01:45 Tomasz Stanislawski wrote:
Hi Hans,
On 07/31/2012 02:11 PM, Hans Verkuil wrote:
On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
Hi Hans,
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter, wouldn't it be useful to support exporting a userptr
buffer at some point in the future?
Shouldn't USERPTR usage be discouraged once we get dma-buf support ?
USERPTR, where available, is currently the
Le mardi 31 juillet 2012 17:03:52 Rob Clark, vous avez écrit :
On Tue, Jul 31, 2012 at 8:39 AM, Rémi Denis-Courmont r...@remlab.net
wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter, wouldn't it be useful to support exporting a userptr
buffer at
Le mardi 31 juillet 2012 19:28:12 Laurent Pinchart, vous avez écrit :
Hi Rémi,
On Tuesday 31 July 2012 16:39:00 Rémi Denis-Courmont wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter, wouldn't it be useful to support exporting a userptr
On Tue, 31 Jul 2012 23:52:35 +0200, Laurent Pinchart
laurent.pinch...@ideasonboard.com wrote:
I want to receive the video buffers in user space for processing.
Typically
processing is software encoding or conversion. That's what virtually
any
V4L application does on the desktop...
But what
Hi Hans,
I do not see any good point in using v4l2_plane. What would be the meaning
of bytesused, length, data_offset in case of DMABUF exporting?
The field reserved0 was introduced to be replaced by __u32 memory if other
means
of buffer description would be needed. The reserved fields at
Hi Rémi,
On Wednesday 01 August 2012 10:37:02 Rémi Denis-Courmont wrote:
On Tue, 31 Jul 2012 23:52:35 +0200, Laurent Pinchart wrote:
I want to receive the video buffers in user space for processing.
Typically processing is software encoding or conversion. That's what
virtually any V4L
Le mercredi 1 août 2012 14:35:03 Laurent Pinchart, vous avez écrit :
But in general, the V4L element in the pipeline does not know how fast
the downstream element(s) will consume the buffers. Thus it has to copy
from the MMAP buffers into anonymous user memory pending processing.
Then any
Le mardi 31 juillet 2012 19:28:12 Laurent Pinchart, vous avez ?crit :
> Hi R?mi,
>
> On Tuesday 31 July 2012 16:39:00 R?mi Denis-Courmont wrote:
> > Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
> > > > For that matter, wouldn't it be useful to support exporting a userptr
Hi R?mi,
On Tuesday 31 July 2012 16:39:00 R?mi Denis-Courmont wrote:
> Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
> > > For that matter, wouldn't it be useful to support exporting a userptr
> > > buffer at some point in the future?
> >
> > Shouldn't USERPTR usage be
Le mardi 31 juillet 2012 17:03:52 Rob Clark, vous avez ?crit :
> On Tue, Jul 31, 2012 at 8:39 AM, R?mi Denis-Courmont
wrote:
> > Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
> >> > For that matter, wouldn't it be useful to support exporting a userptr
> >> > buffer at
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
> > For that matter, wouldn't it be useful to support exporting a userptr
> > buffer at some point in the future?
>
> Shouldn't USERPTR usage be discouraged once we get dma-buf support ?
USERPTR, where available, is currently
On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
> Hi Hans,
>
> On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
> > On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
> > > +/**
> > > + * struct v4l2_exportbuffer - export of video buffer as DMABUF file
> > > descriptor + *
> > > + *
Hi Hans,
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
> On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
> > This patch adds extension to V4L2 api. It allow to export a mmap buffer as
> > file descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer
> > offset used by mmap
On Tue, Jul 31, 2012 at 8:39 AM, R?mi Denis-Courmont wrote:
> Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez ?crit :
>> > For that matter, wouldn't it be useful to support exporting a userptr
>> > buffer at some point in the future?
>>
>> Shouldn't USERPTR usage be discouraged once
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
> This patch adds extension to V4L2 api. It allow to export a mmap buffer as
> file
> descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer offset used by
> mmap and return a file descriptor on success.
>
> Signed-off-by: Tomasz
On Tue, Jul 31, 2012 at 7:11 AM, Hans Verkuil wrote:
>> > For that matter, wouldn't it be useful to support exporting a userptr
>> > buffer
>> > at some point in the future?
>>
>> Shouldn't USERPTR usage be discouraged once we get dma-buf support ?
>
> Why? It's perfectly fine to use it and it's
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
This patch adds extension to V4L2 api. It allow to export a mmap buffer as
file
descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer offset used by
mmap and return a file descriptor on success.
Signed-off-by: Tomasz
Hi Hans,
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
This patch adds extension to V4L2 api. It allow to export a mmap buffer as
file descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer
offset used by mmap and
On Tue 31 July 2012 13:56:14 Laurent Pinchart wrote:
Hi Hans,
On Tuesday 31 July 2012 08:33:56 Hans Verkuil wrote:
On Thu June 14 2012 16:32:23 Tomasz Stanislawski wrote:
+/**
+ * struct v4l2_exportbuffer - export of video buffer as DMABUF file
descriptor + *
+ * @fd:
On Tue, Jul 31, 2012 at 7:11 AM, Hans Verkuil hverk...@xs4all.nl wrote:
For that matter, wouldn't it be useful to support exporting a userptr
buffer
at some point in the future?
Shouldn't USERPTR usage be discouraged once we get dma-buf support ?
Why? It's perfectly fine to use it and
On Tue, Jul 31, 2012 at 8:39 AM, Rémi Denis-Courmont r...@remlab.net wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter, wouldn't it be useful to support exporting a userptr
buffer at some point in the future?
Shouldn't USERPTR usage be discouraged
Hi Rémi,
On Tuesday 31 July 2012 16:39:00 Rémi Denis-Courmont wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter, wouldn't it be useful to support exporting a userptr
buffer at some point in the future?
Shouldn't USERPTR usage be discouraged
Hi Rémi,
On Tuesday 31 July 2012 21:39:40 Rémi Denis-Courmont wrote:
Le mardi 31 juillet 2012 19:28:12 Laurent Pinchart, vous avez écrit :
On Tuesday 31 July 2012 16:39:00 Rémi Denis-Courmont wrote:
Le mardi 31 juillet 2012 14:56:14 Laurent Pinchart, vous avez écrit :
For that matter,
This patch adds extension to V4L2 api. It allow to export a mmap buffer as file
descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer offset used by
mmap and return a file descriptor on success.
Signed-off-by: Tomasz Stanislawski
Signed-off-by: Kyungmin Park
---
This patch adds extension to V4L2 api. It allow to export a mmap buffer as file
descriptor. New ioctl VIDIOC_EXPBUF is added. It takes a buffer offset used by
mmap and return a file descriptor on success.
Signed-off-by: Tomasz Stanislawski t.stanisl...@samsung.com
Signed-off-by: Kyungmin Park
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