From patchwork Tue Aug 25 03:52:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ezequiel Garcia X-Patchwork-Id: 11734785 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 09E87138A for ; Tue, 25 Aug 2020 03:53:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC8E3208E4 for ; Tue, 25 Aug 2020 03:53:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728688AbgHYDx2 (ORCPT ); Mon, 24 Aug 2020 23:53:28 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:52948 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728068AbgHYDx1 (ORCPT ); Mon, 24 Aug 2020 23:53:27 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: ezequiel) with ESMTPSA id D2952298CD5 From: Ezequiel Garcia To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Tomasz Figa , kernel@collabora.com, Jonas Karlman , Hans Verkuil , Alexandre Courbot , Jeffrey Kardatzke , Nicolas Dufresne , Philipp Zabel , Maxime Ripard , Paul Kocialkowski , Jernej Skrabec , Ezequiel Garcia Subject: [PATCH v4 05/19] media: uapi: h264: Increase size of 'first_mb_in_slice' field Date: Tue, 25 Aug 2020 00:52:31 -0300 Message-Id: <20200825035245.594982-6-ezequiel@collabora.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200825035245.594982-1-ezequiel@collabora.com> References: <20200825035245.594982-1-ezequiel@collabora.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Slice header syntax element 'first_mb_in_slice' can point to the last macroblock, currently the field can only reference 65536 macroblocks which is insufficient for 8K videos. Although unlikely, a 8192x4320 video (where macroblocks are 16x16), would contain 138240 macroblocks on a frame. As per the H264 specification, 'first_mb_in_slice' can be up to PicSizeInMbs - 1, so increase the size of the field to 32-bits. Note that v4l2_ctrl_h264_slice_params struct will be modified in a follow-up commit, and so we defer its 64-bit padding. Signed-off-by: Ezequiel Garcia Tested-by: Jonas Karlman --- Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 +- include/media/h264-ctrls.h | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst index 591d3d35c429..a417a1ae50d5 100644 --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst @@ -1774,7 +1774,7 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - * - __u32 - ``header_bit_size`` - - * - __u16 + * - __u32 - ``first_mb_in_slice`` - * - __u8 diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h index 31c6f4c5963b..9a6722edf004 100644 --- a/include/media/h264-ctrls.h +++ b/include/media/h264-ctrls.h @@ -172,7 +172,8 @@ struct v4l2_ctrl_h264_slice_params { /* Offset in bits to slice_data() from the beginning of this slice. */ __u32 header_bit_size; - __u16 first_mb_in_slice; + __u32 first_mb_in_slice; + __u8 slice_type; __u8 pic_parameter_set_id; __u8 colour_plane_id;