linux-kernel - Re: [PATCH v1 03/24] media: h264: Avoid wrapping long_term_frame

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Date:   Tue, 29 Mar 2022 10:35:49 +0200
From:   Sebastian Fricke <sebastian.fricke@...labora.com>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>, kernel@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 03/24] media: h264: Avoid wrapping long_term_frame_idx

On 28.03.2022 15:59, Nicolas Dufresne wrote:
>For long term reference, frame_num is set to long_term_frame_idx which

s/reference/references/

>does not require wrapping. This if fixed by observation, no directly

s/This if/This is/

>related issue have been found yet.
>
>Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Reviewed-by: Sebastian Fricke <sebastian.fricke@...labora.com>

>---
> drivers/media/v4l2-core/v4l2-h264.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c
>index 8d750ee69e74..aebed1cbe05a 100644
>--- a/drivers/media/v4l2-core/v4l2-h264.c
>+++ b/drivers/media/v4l2-core/v4l2-h264.c
>@@ -57,8 +57,10 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
> 		 * '8.2.4.1 Decoding process for picture numbers' of the spec.
> 		 * TODO: This logic will have to be adjusted when we start
> 		 * supporting interlaced content.

As you change the logic can't you remove the TODO comment now?

>+		 * For long term reference, frame_num is set to

s/reference/references/

Greetings,
Sebastian

>+		 * long_term_frame_idx which requires no wrapping.
> 		 */
>-		if (dpb[i].frame_num > cur_frame_num)
>+		if (!b->refs[i].longterm && dpb[i].frame_num > cur_frame_num)
> 			b->refs[i].frame_num = (int)dpb[i].frame_num -
> 					       max_frame_num;
> 		else
>-- 
>2.34.1
>