linux-kernel - Re: [PATCH v1 4/5] media: venus: video decoder drop frames handling

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Message-ID: <CAAFQd5BoP1jbzLam7X1TOxEMNCkVDTkjNWbBkcn3zdiScy0HjA@mail.gmail.com>
Date:   Wed, 14 Nov 2018 20:04:48 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     sgorle@...eaurora.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 v1 4/5] media: venus: video decoder drop frames handling

On Sat, Sep 29, 2018 at 9:01 PM Srinu Gorle <sgorle@...eaurora.org> wrote:
>
> - when drop frame flag received from venus h/w, reset buffer
>   parameters and update v4l2 buffer flags as error buffer.
>
> Signed-off-by: Srinu Gorle <sgorle@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/vdec.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 0035cf2..311f209 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -991,6 +991,12 @@ static void vdec_buf_done(struct venus_inst *inst, unsigned int buf_type,
>         if (hfi_flags & HFI_BUFFERFLAG_DATACORRUPT)
>                 state = VB2_BUF_STATE_ERROR;
>
> +       if (hfi_flags & HFI_BUFFERFLAG_DROP_FRAME) {
> +               vb->planes[0].bytesused = 0;
> +               vb->timestamp = 0;
> +               state = VB2_BUF_STATE_ERROR;
> +       }

What does this HFI_BUFFERFLAG_DROP_FRAME flag mean? When would it
happen? I assume it applies only to CAPTURE buffers, since for OUTPUT
buffers you must not set the bytesuses/timestamp yourself, right? Is
the buffer guaranteed to have no decoded frame inside or the frame
could be there, but incomplete/corrupted?

Best regards,
Tomasz