linux-kernel - Re: [RESEND PATCH v0 2/5] wave5: Support to prepend sps/pps to IDR frame.

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Message-ID: <cdcf594ecaefaac748655bdcb7dcc1c4f9ad1a68.camel@ndufresne.ca>
Date: Wed, 07 Feb 2024 13:00:06 -0500
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: "jackson.lee" <jackson.lee@...psnmedia.com>, mchehab@...nel.org, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
	nas.chung@...psnmedia.com
Cc: lafley.kim@...psnmedia.com, b-brnich@...com
Subject: Re: [RESEND PATCH v0 2/5] wave5: Support to prepend sps/pps to IDR
 frame.

Hi Jackson,

Le mercredi 31 janvier 2024 à 10:30 +0900, jackson.lee a écrit :
> Indicates whether to generate SPS and PPS at every IDR. Setting it to 0 disables generating SPS and PPS at every IDR.
> Setting it to one enables generating SPS and PPS at every IDR.
> 
> Signed-off-by: Jackson Lee <jackson.lee@...psnmedia.com>
> Signed-off-by: Nas Chung <nas.chung@...psnmedia.com>
> ---
>  drivers/media/platform/chips-media/wave5/wave5-hw.c      | 6 ++++--
>  drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c | 7 +++++++
>  drivers/media/platform/chips-media/wave5/wave5-vpuapi.h  | 1 +
>  3 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/chips-media/wave5/wave5-hw.c b/drivers/media/platform/chips-media/wave5/wave5-hw.c
> index f1e022fb148e..8ad7f3a28ae1 100644
> --- a/drivers/media/platform/chips-media/wave5/wave5-hw.c
> +++ b/drivers/media/platform/chips-media/wave5/wave5-hw.c
> @@ -1602,11 +1602,13 @@ int wave5_vpu_enc_init_seq(struct vpu_instance *inst)
>  	if (inst->std == W_AVC_ENC)
>  		vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_INTRA_PARAM, p_param->intra_qp |
>  				((p_param->intra_period & 0x7ff) << 6) |
> -				((p_param->avc_idr_period & 0x7ff) << 17));
> +				((p_param->avc_idr_period & 0x7ff) << 17) |
> +				(p_param->forced_idr_header_enable << 28));

I can spot evident hard-coding of mask and bit shifts in here. In order to
continuously improve this driver code, I would like to see this (and the
following) magic number being defined with well named macros as a preparation
patch to this feature change.

regards,
Nicolas

>  	else if (inst->std == W_HEVC_ENC)
>  		vpu_write_reg(inst->dev, W5_CMD_ENC_SEQ_INTRA_PARAM,
>  			      p_param->decoding_refresh_type | (p_param->intra_qp << 3) |
> -				(p_param->intra_period << 16));
> +			      (p_param->forced_idr_header_enable << 9) |
> +			      (p_param->intra_period << 16));
>  
>  	reg_val = (p_param->rdo_skip << 2) |
>  		(p_param->lambda_scaling_enable << 3) |
> diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> index 0cb5bfb67258..761775216cd4 100644
> --- a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> +++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> @@ -1125,6 +1125,9 @@ static int wave5_vpu_enc_s_ctrl(struct v4l2_ctrl *ctrl)
>  	case V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE:
>  		inst->enc_param.entropy_coding_mode = ctrl->val;
>  		break;
> +	case V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR:
> +		inst->enc_param.forced_idr_header_enable = ctrl->val;
> +		break;
>  	case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT:
>  		break;
>  	default:
> @@ -1292,6 +1295,7 @@ static void wave5_set_enc_openparam(struct enc_open_param *open_param,
>  		else
>  			open_param->wave_param.intra_refresh_arg = num_ctu_row;
>  	}
> +	open_param->wave_param.forced_idr_header_enable = input.forced_idr_header_enable;
>  }
>  
>  static int initialize_sequence(struct vpu_instance *inst)
> @@ -1775,6 +1779,9 @@ static int wave5_vpu_open_enc(struct file *filp)
>  			  0, 1, 1, 0);
>  	v4l2_ctrl_new_std(v4l2_ctrl_hdl, &wave5_vpu_enc_ctrl_ops,
>  			  V4L2_CID_MIN_BUFFERS_FOR_OUTPUT, 1, 32, 1, 1);
> +	v4l2_ctrl_new_std(v4l2_ctrl_hdl, &wave5_vpu_enc_ctrl_ops,
> +			  V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR,
> +			  0, 1, 1, 0);
>  
>  	if (v4l2_ctrl_hdl->error) {
>  		ret = -ENODEV;
> diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> index 352f6e904e50..3ad6118550ac 100644
> --- a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> +++ b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> @@ -566,6 +566,7 @@ struct enc_wave_param {
>  	u32 lambda_scaling_enable: 1; /* enable lambda scaling using custom GOP */
>  	u32 transform8x8_enable: 1; /* enable 8x8 intra prediction and 8x8 transform */
>  	u32 mb_level_rc_enable: 1; /* enable MB-level rate control */
> +	u32 forced_idr_header_enable: 1; /* enable header encoding before IDR frame */
>  };
>  
>  struct enc_open_param {