linux-kernel - Re: [PATCH v1 24/24] media: rkvdec-h264: Don't hardcode SPS/PPS parameters

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Date:   Tue, 29 Mar 2022 09:22:16 +0200
From:   Sebastian Fricke <sebastian.fricke@...labora.com>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...labora.com, Alex Bee <knaerzche@...il.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 24/24] media: rkvdec-h264: Don't hardcode SPS/PPS
 parameters

Hey Nicolas,

The patch series doesn't seem to apply on the latest media tree master
branch. Looking at your tree I can see that you have commit: ba2c670a
"media: nxp: Restrict VIDEO_IMX_MIPI_CSIS to ARCH_MXC or COMPILE_TEST
Laurent Pinchart authored 1 week ago "

But the current head of the media tree is: 71e6d0608e4d
"media: platform: Remove unnecessary print function dev_err()
Yang Li authored 13 days ago"

On 28.03.2022 15:59, Nicolas Dufresne wrote:
>From: Alex Bee <knaerzche@...il.com>
>
>Some SPS/PPS parameters are currently hardcoded in the driver
>even though so do exist in the uapi which is stable by now.

s/even though so/even though they/
>
>Use them instead of hardcoding them.
>
>Conformance tests have shown there is no difference, but it might
>increase decoder performance.

I think it would be great if we could add some performance metrics to
the commit description to have a metric that following patches could
compare themselves with.

Greetings,
Sebastian

>
>Signed-off-by: Alex Bee <knaerzche@...il.com>
>---
> drivers/staging/media/rkvdec/rkvdec-h264.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
>diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
>index 891c48bf6a51..91f65d78e453 100644
>--- a/drivers/staging/media/rkvdec/rkvdec-h264.c
>+++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
>@@ -655,13 +655,14 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
>
> #define WRITE_PPS(value, field) set_ps_field(hw_ps->info, field, value)
> 	/* write sps */
>-	WRITE_PPS(0xf, SEQ_PARAMETER_SET_ID);
>-	WRITE_PPS(0xff, PROFILE_IDC);
>-	WRITE_PPS(1, CONSTRAINT_SET3_FLAG);
>+	WRITE_PPS(sps->seq_parameter_set_id, SEQ_PARAMETER_SET_ID);
>+	WRITE_PPS(sps->profile_idc, PROFILE_IDC);
>+	WRITE_PPS((sps->constraint_set_flags & 1 << 3) ? 1 : 0, CONSTRAINT_SET3_FLAG);
> 	WRITE_PPS(sps->chroma_format_idc, CHROMA_FORMAT_IDC);
> 	WRITE_PPS(sps->bit_depth_luma_minus8, BIT_DEPTH_LUMA);
> 	WRITE_PPS(sps->bit_depth_chroma_minus8, BIT_DEPTH_CHROMA);
>-	WRITE_PPS(0, QPPRIME_Y_ZERO_TRANSFORM_BYPASS_FLAG);
>+	WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS),
>+		  QPPRIME_Y_ZERO_TRANSFORM_BYPASS_FLAG);
> 	WRITE_PPS(sps->log2_max_frame_num_minus4, LOG2_MAX_FRAME_NUM_MINUS4);
> 	WRITE_PPS(sps->max_num_ref_frames, MAX_NUM_REF_FRAMES);
> 	WRITE_PPS(sps->pic_order_cnt_type, PIC_ORDER_CNT_TYPE);
>@@ -679,8 +680,8 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
> 		  DIRECT_8X8_INFERENCE_FLAG);
>
> 	/* write pps */
>-	WRITE_PPS(0xff, PIC_PARAMETER_SET_ID);
>-	WRITE_PPS(0x1f, PPS_SEQ_PARAMETER_SET_ID);
>+	WRITE_PPS(pps->pic_parameter_set_id, PIC_PARAMETER_SET_ID);
>+	WRITE_PPS(pps->seq_parameter_set_id, PPS_SEQ_PARAMETER_SET_ID);
> 	WRITE_PPS(!!(pps->flags & V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE),
> 		  ENTROPY_CODING_MODE_FLAG);
> 	WRITE_PPS(!!(pps->flags & V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT),
>-- 
>2.34.1
>