linux-kernel - Re: [PATCH 2/2] media: venus: add new rate control type MBR for encoder

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Date: Thu, 18 Jan 2024 18:44:56 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Sachin Kumar Garg <quic_sachinku@...cinc.com>, hverkuil-cisco@...all.nl,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>, Andy Gross <agross@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/2] media: venus: add new rate control type MBR for
 encoder



On 1/18/24 11:59, Sachin Kumar Garg wrote:
> There is no limit on the maximum level of the bit rate with
> the existing VBR rate control.
> V4L2_MPEG_VIDEO_BITRATE_MODE_MBR rate control will limit the
> frame maximum bit rate range to the +/- 10% of the configured
> bit-rate value. Encoder will choose appropriate quantization
> parameter and do the smart bit allocation to set the frame
> maximum bitrate level.
> 
> Signed-off-by: Sachin Kumar Garg <quic_sachinku@...cinc.com>
> ---
>   drivers/media/platform/qcom/venus/hfi_cmds.c  | 38 +++++++++++++------
>   .../media/platform/qcom/venus/hfi_helper.h    |  1 +
>   drivers/media/platform/qcom/venus/venc.c      |  2 +
>   .../media/platform/qcom/venus/venc_ctrls.c    |  5 ++-
>   4 files changed, 33 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.c b/drivers/media/platform/qcom/venus/hfi_cmds.c
> index 3418d2dd9371..95fc27e0dc7d 100644
> --- a/drivers/media/platform/qcom/venus/hfi_cmds.c
> +++ b/drivers/media/platform/qcom/venus/hfi_cmds.c
> @@ -645,17 +645,33 @@ static int pkt_session_set_property_1x(struct hfi_session_set_property_pkt *pkt,
>   	case HFI_PROPERTY_PARAM_VENC_RATE_CONTROL: {
>   		u32 *in = pdata;
>   
> -		switch (*in) {
> -		case HFI_RATE_CONTROL_OFF:
> -		case HFI_RATE_CONTROL_CBR_CFR:
> -		case HFI_RATE_CONTROL_CBR_VFR:
> -		case HFI_RATE_CONTROL_VBR_CFR:
> -		case HFI_RATE_CONTROL_VBR_VFR:
> -		case HFI_RATE_CONTROL_CQ:
> -			break;
> -		default:
> -			ret = -EINVAL;
> -			break;
> +		if (hfi_ver == HFI_VERSION_4XX) {

So, only sdm845/sc7180 and friends support it, but the newer
SoCs (like 8250 don't)?

[...]

> --- a/drivers/media/platform/qcom/venus/venc_ctrls.c
> +++ b/drivers/media/platform/qcom/venus/venc_ctrls.c
> @@ -387,10 +387,11 @@ int venc_ctrl_init(struct venus_inst *inst)
>   
>   	v4l2_ctrl_new_std_menu(&inst->ctrl_handler, &venc_ctrl_ops,
>   		V4L2_CID_MPEG_VIDEO_BITRATE_MODE,
> -		V4L2_MPEG_VIDEO_BITRATE_MODE_CBR,
> +		V4L2_MPEG_VIDEO_BITRATE_MODE_MBR,

Is this okay, since you're claiming only v4 supports it?

Konrad