linux-kernel - Re: [PATCH 3/7] media: hantro: HEVC: Fix chroma offset computation

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Date:   Fri, 1 Jul 2022 11:03:18 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     mchehab@...nel.org, hverkuil@...all.nl,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, mripard@...nel.org, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org,
        nicolas.dufresne@...labora.com, andrzej.p@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH 3/7] media: hantro: HEVC: Fix chroma offset computation


Le 01/07/2022 à 10:47, Paul Kocialkowski a écrit :
> Hi Benjamin,
>
> On Fri 17 Jun 22, 13:57, Benjamin Gaignard wrote:
>> The chroma offset depends of the bitstream depth.
>> Make sure that ctx->bit_depth is used to compute it.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> ---
>>   drivers/staging/media/hantro/hantro_g2_hevc_dec.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
>> index 9eac133bda68..8407ad45b7b7 100644
>> --- a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
>> +++ b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
>> @@ -12,7 +12,7 @@
>>   
>>   static size_t hantro_hevc_chroma_offset(struct hantro_ctx *ctx)
>>   {
>> -	return ctx->dst_fmt.width * ctx->dst_fmt.height;
>> +	return ctx->dst_fmt.width * ctx->dst_fmt.height * ctx->bit_depth / 8;
> Is this a case for DIV_ROUND_UP or are you sure the rounded-down size is always
> sufficient?

No need of DIV_ROUND_UP here because it could affect the chroma offset when
using decoder tiled format and add extra bytes between luma and chroma planes.

Regards,
Benjamin

> Cheers,
>
> Paul
>
>>   }
>>   
>>   static size_t hantro_hevc_motion_vectors_offset(struct hantro_ctx *ctx)
>> -- 
>> 2.32.0
>>