linux-kernel - Re: [PATCH] media: venus: add support for selection rectangles

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Message-ID: <a94ef2231f195e757d8af9483cf44899@codeaurora.org>
Date:   Fri, 09 Nov 2018 07:38:27 +0000
From:   mgottam@...eaurora.org
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: add support for selection rectangles

On 2018-11-02 03:16, Tomasz Figa wrote:
> On Fri, Nov 2, 2018 at 12:02 AM Stanimir Varbanov
> <stanimir.varbanov@...aro.org> wrote:
>> 
>> Hi Malathi,
>> 
>> On 11/1/18 3:10 PM, mgottam@...eaurora.org wrote:
>> > On 2018-10-16 15:11, Stanimir Varbanov wrote:
>> >> Hi Malathi,
>> >>
>> >> On 10/09/2018 10:53 AM, Malathi Gottam wrote:
>> >>> Handles target type crop by setting the new active rectangle
>> >>> to hardware. The new rectangle should be within YUV size.
>> >>>
>> >>> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
>> >>> ---
>> >>>  drivers/media/platform/qcom/venus/venc.c | 19 +++++++++++++++++--
>> >>>  1 file changed, 17 insertions(+), 2 deletions(-)
>> >>>
>> >>> diff --git a/drivers/media/platform/qcom/venus/venc.c
>> >>> b/drivers/media/platform/qcom/venus/venc.c
>> >>> index 3f50cd0..754c19a 100644
>> >>> --- a/drivers/media/platform/qcom/venus/venc.c
>> >>> +++ b/drivers/media/platform/qcom/venus/venc.c
>> >>> @@ -478,16 +478,31 @@ static int venc_g_fmt(struct file *file, void
>> >>> *fh, struct v4l2_format *f)
>> >>>  venc_s_selection(struct file *file, void *fh, struct v4l2_selection *s)
>> >>>  {
>> >>>      struct venus_inst *inst = to_inst(file);
>> >>> +    int ret;
>> >>> +    u32 buftype;
>> >>>
>> >>>      if (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
>> >>>          return -EINVAL;
>> >>>
>> >>>      switch (s->target) {
>> >>>      case V4L2_SEL_TGT_CROP:
>> >>> -        if (s->r.width != inst->out_width ||
>> >>> -            s->r.height != inst->out_height ||
>> >>> +        if (s->r.width > inst->out_width ||
>> >>> +            s->r.height > inst->out_height ||
>> >>>              s->r.top != 0 || s->r.left != 0)
>> >>>              return -EINVAL;
> 
> Note that returning -EINVAL is not what VIDIOC_S_SELECTION should do 
> here.
> 
> As per the general V4L2 spec [1], VIDIOC_S_SELECTION is expected to
> adjust the crop rectangle "as close as possible to the requested one".
> In this case that would likely mean something like this:
> 
> if (s->r.left != 0) {
>     s->r.width += s->r.left;
>     s->r.left = 0;
> }
> 
> if (s->r.top != 0) {
>     s->r.height += s->r.top;
>     s->r.top = 0;
> }
> 
> if (s->r.width > inst->out_width)
>     s->r.width = inst->out_width;
> 
> if (s->r.height > inst->out_height)
>     s->r.height = inst->out_height;
> 
> [1]
> https://www.kernel.org/doc/html/latest/media/uapi/v4l/vidioc-g-selection.html
> 

Yes Tomasz, I overlooked the spec that we cannot return EINVAL in this 
case.

I will make the necessary changes and update the new patch.
>> >>> +        if (s->r.width != inst->width ||
>> >>> +            s->r.height != inst->height) {
>> >>> +            buftype = HFI_BUFFER_OUTPUT;
>> >>> +            ret = venus_helper_set_output_resolution(inst,
>> >>> +                                 s->r.width,
>> >>> +                                 s->r.height,
>> >>> +                                 buftype);
>> >>
>> >> I'm afraid that set_output_resolution cannot be called at any time. Do
>> >> you think we can set it after start_session?
>> >
>> > Yes Stan, we can set output_resolution after the session has been
>> > initialization.
>> > As per the spec, this call s_selection is an optional step under
>> > Initialization
>> > procedure of encoder even before we request buffers.

Setting this output resolution here I feel it as a repetition as we
have this width and height set to firmware as a part of 
VIDIOC_REQBUFS().
So updating the selection rectangle would be sufficient in this case.

>> 
>> What spec you are referring to? The spec for the encoders [1] or
>> something else.
> 
> For our convenience, Hans was nice enough to host a compiled version 
> at:
> https://hverkuil.home.xs4all.nl/request-api/uapi/v4l/dev-encoder.html
> 
> Best regards,
> Tomasz