linux-kernel - Re: [PATCH] media: venus: dynamic handling of bitrate

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Date:   Thu, 1 Nov 2018 14:18:43 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Malathi Gottam <mgottam@...eaurora.org>, hverkuil@...all.nl,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, acourbot@...omium.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: dynamic handling of bitrate

Hi Malathi,

Thanks for the patch!

On 10/31/18 9:42 AM, Malathi Gottam wrote:
> Any request for a change in bitrate after both planes
> are streamed on is handled by setting the target bitrate
> property to hardware.
> 
> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/venc_ctrls.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/venc_ctrls.c b/drivers/media/platform/qcom/venus/venc_ctrls.c
> index 45910172..54f310c 100644
> --- a/drivers/media/platform/qcom/venus/venc_ctrls.c
> +++ b/drivers/media/platform/qcom/venus/venc_ctrls.c
> @@ -79,7 +79,9 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
>  {
>  	struct venus_inst *inst = ctrl_to_inst(ctrl);
>  	struct venc_controls *ctr = &inst->controls.enc;
> +	struct hfi_bitrate brate;
>  	u32 bframes;
> +	u32 ptype;
>  	int ret;
>  
>  	switch (ctrl->id) {
> @@ -88,6 +90,15 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
>  		break;
>  	case V4L2_CID_MPEG_VIDEO_BITRATE:
>  		ctr->bitrate = ctrl->val;
> +		if (inst->streamon_out && inst->streamon_cap) {

Hmm, hfi_session_set_property already checks the instance state so I
don't think those checks are needed. Another thing is that we need to
take the instance mutex to check the instance state.

> +			ptype = HFI_PROPERTY_CONFIG_VENC_TARGET_BITRATE;
> +			brate.bitrate = ctr->bitrate;
> +			brate.layer_id = 0;
> +
> +			ret = hfi_session_set_property(inst, ptype, &brate);
> +			if (ret)
> +				return ret;
> +		}
>  		break;
>  	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
>  		ctr->bitrate_peak = ctrl->val;
> 

-- 
regards,
Stan