linux-kernel - Re: [PATCH 3/4] media: qcom: iris: Add B frames support for encoder

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Message-ID: <820ea981-2fa4-48be-9bee-8936804bfd7a@oss.qualcomm.com>
Date: Tue, 2 Dec 2025 14:46:43 +0800
From: Wangao Wang <wangao.wang@....qualcomm.com>
To: Bryan O'Donoghue <bod@...nel.org>,
        Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: wangao.wang@....qualcomm.com, quic_qiweil@...cinc.com,
        Renjiang Han <renjiang.han@....qualcomm.com>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] media: qcom: iris: Add B frames support for encoder



On 2025/11/27 18:43, Bryan O'Donoghue wrote:
> On 27/11/2025 07:44, Wangao Wang wrote:
>> +    intra_period.pframes = (gop_size - 1) / (b_frame + 1);
>> +    intra_period.bframes = b_frame;
> 
> Why do you need to set pframes when setting bframes ?
> 
> ---
> bod

intra_period represents the length of a GOP, which includes both 
P-frames and B-frames. The counts of P-frames and B-frames within a GOP 
must be communicated to the firmware.

-- 
Best Regards,
Wangao