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

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Date:   Wed, 30 Mar 2022 11:27:51 -0400
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Sebastian Fricke <sebastian.fricke@...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

Le mardi 29 mars 2022 à 09:22 +0200, Sebastian Fricke a écrit :
> 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.

Alex, can you extend on this one? I'm not sure how this can impact performance,
so I doubt any mitric will be significant. Can I just drop that part of the
comment ?
> 
> 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
> >