Re: [PATCH 3/9] media: rkvdec: h264: Fix pic width and height in mbs

[Ezequiel Garcia <ezequiel@collabora.com>]

On Wed, 2020-07-01 at 21:56 +0000, Jonas Karlman wrote:
> The width and height in mbs is currently configured based on OUTPUT buffer
> resolution, this works for frame pictures but can cause issues for field
> pictures or when frmsize step_width is changed to support 10-bit decoding.
> 
> When frame_mbs_only_flag is 0 the height in mbs should be height of
> the field instead of height of frame.
> 
> Validate pic_width_in_mbs_minus1 and pic_height_in_map_units_minus1
> against CAPTURE buffer resolution and use these values to configure HW.
> 
> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
> ---
>  drivers/staging/media/rkvdec/rkvdec-h264.c | 44 +++++++++++++++++++---
>  1 file changed, 39 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
> index f0cfed84d60d..c9aebeb8f9b3 100644
> --- a/drivers/staging/media/rkvdec/rkvdec-h264.c
> +++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
> @@ -672,8 +672,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>  		  LOG2_MAX_PIC_ORDER_CNT_LSB_MINUS4);
>  	WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO),
>  		  DELTA_PIC_ORDER_ALWAYS_ZERO_FLAG);
> -	WRITE_PPS(DIV_ROUND_UP(ctx->coded_fmt.fmt.pix_mp.width, 16), PIC_WIDTH_IN_MBS);
> -	WRITE_PPS(DIV_ROUND_UP(ctx->coded_fmt.fmt.pix_mp.height, 16), PIC_HEIGHT_IN_MBS);
> +	WRITE_PPS(sps->pic_width_in_mbs_minus1 + 1, PIC_WIDTH_IN_MBS);
> +	WRITE_PPS(sps->pic_height_in_map_units_minus1 + 1, PIC_HEIGHT_IN_MBS);
>  	WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY),
>  		  FRAME_MBS_ONLY_FLAG);
>  	WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD),
> @@ -1058,10 +1058,33 @@ static void rkvdec_h264_stop(struct rkvdec_ctx *ctx)
>  	kfree(h264_ctx);
>  }
>  
> -static void rkvdec_h264_run_preamble(struct rkvdec_ctx *ctx,
> -				     struct rkvdec_h264_run *run)
> +static int validate_sps(struct rkvdec_ctx *ctx,
> +			const struct v4l2_ctrl_h264_sps *sps)
> +{
> +	unsigned int width, height;
> +
> +	if (WARN_ON(!sps))
> +		return -EINVAL;
> +
> +	width = (sps->pic_width_in_mbs_minus1 + 1) * 16;
> +	height = (sps->pic_height_in_map_units_minus1 + 1) * 16;
> +
> +	if (width > ctx->decoded_fmt.fmt.pix_mp.width ||
> +	    height > ctx->decoded_fmt.fmt.pix_mp.height) {

Why using decoded_fmt instead of coded_fmt?

Also, by the time the SPS control is passed, the OUTPUT
and CAPTURE formats should be already set, so it should be
possible to validate the SPS at TRY_EXT_CTRLS, using
v4l2_ctrl_ops.try_ctrl.

That would be much better, since once the application
calls STREAMON on both queues, I think things are
expected to be validated as much as possible.

Thanks,
Ezequiel

> +		dev_err(ctx->dev->dev,
> +			"unexpected bitstream resolution %ux%u\n",
> +			width, height);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rkvdec_h264_run_preamble(struct rkvdec_ctx *ctx,
> +				    struct rkvdec_h264_run *run)
>  {
>  	struct v4l2_ctrl *ctrl;
> +	int ret;
>  
>  	ctrl = v4l2_ctrl_find(&ctx->ctrl_hdl,
>  			      V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS);
> @@ -1080,6 +1103,12 @@ static void rkvdec_h264_run_preamble(struct rkvdec_ctx *ctx,
>  	run->scaling_matrix = ctrl ? ctrl->p_cur.p : NULL;
>  
>  	rkvdec_run_preamble(ctx, &run->base);
> +
> +	ret = validate_sps(ctx, run->sps);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
>  }
>  
>  static int rkvdec_h264_run(struct rkvdec_ctx *ctx)
> @@ -1088,8 +1117,13 @@ static int rkvdec_h264_run(struct rkvdec_ctx *ctx)
>  	struct rkvdec_dev *rkvdec = ctx->dev;
>  	struct rkvdec_h264_ctx *h264_ctx = ctx->priv;
>  	struct rkvdec_h264_run run;
> +	int ret;
>  
> -	rkvdec_h264_run_preamble(ctx, &run);
> +	ret = rkvdec_h264_run_preamble(ctx, &run);
> +	if (ret) {
> +		rkvdec_run_postamble(ctx, &run.base);
> +		return ret;
> +	}
>  
>  	/* Build the P/B{0,1} ref lists. */
>  	v4l2_h264_init_reflist_builder(&reflist_builder, run.decode_params,