linux-kernel - Re: [PATCH 1/3] media: rockchip: Introduce the rkvdec2 driver

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Message-ID: <4302165.yKVeVyVuyW@arisu>
Date: Tue, 18 Jun 2024 08:39:07 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: Jianfeng Liu <liujianfeng1994@...il.com>
Cc: alchark@...il.com, andy.yan@...k-chips.com, conor+dt@...nel.org,
 cristian.ciocaltea@...labora.com, devicetree@...r.kernel.org,
 didi.debian@...ow.org, dsimic@...jaro.org, gregkh@...uxfoundation.org,
 heiko@...ech.de, krzk+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
 liujianfeng1994@...il.com, mchehab@...nel.org, nicolas@...fresne.ca,
 robh@...nel.org, sebastian.reichel@...labora.com
Subject: Re: [PATCH 1/3] media: rockchip: Introduce the rkvdec2 driver

On Tuesday, June 18, 2024 8:13:29 A.M. EDT Jianfeng Liu wrote:
> Hi Detlev,
> 
> On Fri, 14 Jun 2024 21:56:27 -0400, Detlev Casanova wrote:
> >+		.frmsize = {
> >+			.min_width = 16,
> >+			.max_width =  65520,
> >+			.step_width = 16,
> >+			.min_height = 16,
> >+			.max_height =  65520,
> >+			.step_height = 16,
> >+		},
> 
> I think the min/max width/height are incorrect. From rockchip's TRM V1.0
> Part1 page 374, supported image size is 64x64 to 65472x65472.

Page 374 shows the sizes for h265. h264 is the next table, where 16x16 and 
65520x65520 is documented.

> And my
> chromium can't use rkvdec2 because min width/height are set to 16, which
> 
> will cause error at here in rkvdec2_h264_validate_sps:
> >+	if (width > ctx->coded_fmt.fmt.pix_mp.width ||
> >+	    height > ctx->coded_fmt.fmt.pix_mp.height)
> >+		return -EINVAL;
> 
> width is 16, height is 32 while ctx->coded_fmt.fmt.pix_mp.width and
> ctx->coded_fmt.fmt.pix_mp.height are both 16.

Maybe

if (!(sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY))
	height *= 2;

is causing issues in this case, I can check.

> After changing them to 64 my chromium can use rkvdec2 to decode h264
> videos now.
> 
> Anyway many thanks to your amazing work!
> 
> Best regards,
> Jianfeng


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