From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B3A6C32792 for ; Mon, 30 Sep 2019 22:58:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1DDD321855 for ; Mon, 30 Sep 2019 22:58:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731816AbfI3W6m convert rfc822-to-8bit (ORCPT ); Mon, 30 Sep 2019 18:58:42 -0400 Received: from mailoutvs42.siol.net ([185.57.226.233]:51887 "EHLO mail.siol.net" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726425AbfI3W6l (ORCPT ); Mon, 30 Sep 2019 18:58:41 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.siol.net (Postfix) with ESMTP id E103A522E4B; Tue, 1 Oct 2019 00:58:36 +0200 (CEST) X-Virus-Scanned: amavisd-new at psrvmta10.zcs-production.pri Received: from mail.siol.net ([127.0.0.1]) by localhost (psrvmta10.zcs-production.pri [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id U70U11j2XR3J; Tue, 1 Oct 2019 00:58:36 +0200 (CEST) Received: from mail.siol.net (localhost [127.0.0.1]) by mail.siol.net (Postfix) with ESMTPS id 469CF522EAA; Tue, 1 Oct 2019 00:58:36 +0200 (CEST) Received: from jernej-laptop.localnet (cpe-86-58-59-25.static.triera.net [86.58.59.25]) (Authenticated sender: jernej.skrabec@siol.net) by mail.siol.net (Postfix) with ESMTPA id 7E54B522E4B; Tue, 1 Oct 2019 00:58:35 +0200 (CEST) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: Hans Verkuil Cc: mchehab@kernel.org, paul.kocialkowski@bootlin.com, mripard@kernel.org, pawel@osciak.com, m.szyprowski@samsung.com, kyungmin.park@samsung.com, tfiga@chromium.org, wens@csie.org, gregkh@linuxfoundation.org, boris.brezillon@collabora.com, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, linux-arm-kernel@lists.infradead.org, ezequiel@collabora.com, jonas@kwiboo.se Subject: Re: [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames Date: Tue, 01 Oct 2019 00:58:35 +0200 Message-ID: <11665334.4LxpHo8hza@jernej-laptop> In-Reply-To: References: <20190929200023.215831-1-jernej.skrabec@siol.net> <4342181.Ehiz7mZe5m@jernej-laptop> MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dne torek, 01. oktober 2019 ob 00:43:34 CEST je Hans Verkuil napisal(a): > On 10/1/19 12:27 AM, Jernej Škrabec wrote: > > Dne ponedeljek, 30. september 2019 ob 10:10:48 CEST je Hans Verkuil > > > > napisal(a): > >> On 9/29/19 10:00 PM, Jernej Skrabec wrote: > >>> This series adds support for decoding multi-slice H264 frames along with > >>> support for V4L2_DEC_CMD_FLUSH and V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF. > >>> > >>> Code was tested by modified ffmpeg, which can be found here: > >>> https://github.com/jernejsk/FFmpeg, branch mainline-test > >>> It has to be configured with at least following options: > >>> --enable-v4l2-request --enable-libudev --enable-libdrm > >>> > >>> Samples used for testing: > >>> http://jernej.libreelec.tv/videos/h264/BA1_FT_C.mp4 > >>> http://jernej.libreelec.tv/videos/h264/h264.mp4 > >>> > >>> Command line used for testing: > >>> ffmpeg -hwaccel drm -hwaccel_device /dev/dri/card0 -i h264.mp4 -pix_fmt > >>> bgra -f fbdev /dev/fb0 > >>> > >>> Please note that V4L2_DEC_CMD_FLUSH was not tested because I'm > >>> not sure how. ffmpeg follows exactly which slice is last in frame > >>> and sets hold flag accordingly. Improper usage of hold flag would > >>> corrupt ffmpeg assumptions and it would probably crash. Any ideas > >>> how to test this are welcome! > >> > >> It can be tested partially at least: if ffmpeg tells you it is the last > >> slice, then queue the slice with the HOLD flag set, then call FLUSH > >> afterwards. This should clear the HOLD flag again. In this case the > >> queued > >> buffer is probably not yet processed, so the flag is cleared before the > >> decode job starts. > >> > >> You can also try to add a sleep before calling FLUSH to see what happens > >> if the last queued buffer is already decoded. > > > > Ok, I tried following code: > > https://github.com/jernejsk/FFmpeg/blob/flush_test/libavcodec/ > > v4l2_request.c#L220-L233 > > > > But results are not good. It seems that out_vb in flush command is always > > NULL and so it always marks capture buffer as done, which leads to kernel > > warnings. > > > > dmesg output with debugging messages is here: http://ix.io/1Ks8 > > > > Currently I'm not sure what is going on. Shouldn't be output buffer queued > > and waiting to MEDIA_REQUEST_IOC_QUEUE which is executed after flush > > command as it can be seen from ffmpeg code linked above? > > Argh, I forgot about the fact that this uses requests. > > The FLUSH should happen *after* the MEDIA_REQUEST_IOC_QUEUE ioctl. Otherwise > it has no effect. As long as the request hasn't been queued, the buffer is > also not queued to the driver, so out_vb will indeed be NULL. Well, flush cmd has effect if it is called before MEDIA_REQUEST_IOC_QUEUE ioctl as it can be seen from linked dmesg output. I guess there is nothing that we can do to prevent wrong usage? BTW, if capture buffer is marked as done, shouldn't be also removed from the queue? Best regards, Jernej > > Sorry for the confusion. > > Regards, > > Hans > > > Best regards, > > Jernej > > > >> Regards, > >> > >> Hans > >> > >>> Thanks to Jonas for adjusting ffmpeg. > >>> > >>> Please let me know what you think. > >>> > >>> Best regards, > >>> Jernej > >>> > >>> Changes from v1: > >>> - added Rb tags > >>> - updated V4L2_DEC_CMD_FLUSH documentation > >>> - updated first slice detection in Cedrus > >>> - hold capture buffer flag is set according to source format > >>> - added v4l m2m stateless_(try_)decoder_cmd ioctl helpers > >>> > >>> Hans Verkuil (2): > >>> vb2: add V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF > >>> videodev2.h: add V4L2_DEC_CMD_FLUSH > >>> > >>> Jernej Skrabec (4): > >>> media: v4l2-mem2mem: add stateless_(try_)decoder_cmd ioctl helpers > >>> media: cedrus: Detect first slice of a frame > >>> media: cedrus: h264: Support multiple slices per frame > >>> media: cedrus: Add support for holding capture buffer > >>> > >>> Documentation/media/uapi/v4l/buffer.rst | 13 ++++++ > >>> .../media/uapi/v4l/vidioc-decoder-cmd.rst | 10 +++- > >>> .../media/uapi/v4l/vidioc-reqbufs.rst | 6 +++ > >>> .../media/videodev2.h.rst.exceptions | 1 + > >>> .../media/common/videobuf2/videobuf2-v4l2.c | 8 +++- > >>> drivers/media/v4l2-core/v4l2-mem2mem.c | 35 ++++++++++++++ > >>> drivers/staging/media/sunxi/cedrus/cedrus.h | 1 + > >>> .../staging/media/sunxi/cedrus/cedrus_dec.c | 11 +++++ > >>> .../staging/media/sunxi/cedrus/cedrus_h264.c | 11 ++++- > >>> .../staging/media/sunxi/cedrus/cedrus_hw.c | 8 ++-- > >>> .../staging/media/sunxi/cedrus/cedrus_video.c | 14 ++++++ > >>> include/media/v4l2-mem2mem.h | 46 +++++++++++++++++++ > >>> include/media/videobuf2-core.h | 3 ++ > >>> include/media/videobuf2-v4l2.h | 5 ++ > >>> include/uapi/linux/videodev2.h | 14 ++++-- > >>> 15 files changed, 175 insertions(+), 11 deletions(-) From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF373C388F3 for ; Mon, 30 Sep 2019 22:58:44 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BBB0C2190F for ; Mon, 30 Sep 2019 22:58:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBB0C2190F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=siol.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=driverdev-devel-bounces@linuxdriverproject.org Received: from localhost (localhost 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7E54B522E4B; Tue, 1 Oct 2019 00:58:35 +0200 (CEST) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: Hans Verkuil Subject: Re: [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames Date: Tue, 01 Oct 2019 00:58:35 +0200 Message-ID: <11665334.4LxpHo8hza@jernej-laptop> In-Reply-To: References: <20190929200023.215831-1-jernej.skrabec@siol.net> <4342181.Ehiz7mZe5m@jernej-laptop> MIME-Version: 1.0 X-BeenThere: driverdev-devel@linuxdriverproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Driver Project Developer List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devel@driverdev.osuosl.org, linux-media@vger.kernel.org, pawel@osciak.com, jonas@kwiboo.se, gregkh@linuxfoundation.org, wens@csie.org, mripard@kernel.org, tfiga@chromium.org, paul.kocialkowski@bootlin.com, kyungmin.park@samsung.com, boris.brezillon@collabora.com, linux-arm-kernel@lists.infradead.org, mchehab@kernel.org, ezequiel@collabora.com, linux-kernel@vger.kernel.org, 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([127.0.0.1]) by localhost (psrvmta10.zcs-production.pri [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id U70U11j2XR3J; Tue, 1 Oct 2019 00:58:36 +0200 (CEST) Received: from mail.siol.net (localhost [127.0.0.1]) by mail.siol.net (Postfix) with ESMTPS id 469CF522EAA; Tue, 1 Oct 2019 00:58:36 +0200 (CEST) Received: from jernej-laptop.localnet (cpe-86-58-59-25.static.triera.net [86.58.59.25]) (Authenticated sender: jernej.skrabec@siol.net) by mail.siol.net (Postfix) with ESMTPA id 7E54B522E4B; Tue, 1 Oct 2019 00:58:35 +0200 (CEST) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: Hans Verkuil Subject: Re: [PATCH v2 0/6] media: cedrus: h264: Support multi-slice frames Date: Tue, 01 Oct 2019 00:58:35 +0200 Message-ID: <11665334.4LxpHo8hza@jernej-laptop> In-Reply-To: References: <20190929200023.215831-1-jernej.skrabec@siol.net> <4342181.Ehiz7mZe5m@jernej-laptop> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190930_155840_182064_7658DD0D X-CRM114-Status: GOOD ( 22.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devel@driverdev.osuosl.org, linux-media@vger.kernel.org, pawel@osciak.com, jonas@kwiboo.se, gregkh@linuxfoundation.org, wens@csie.org, mripard@kernel.org, tfiga@chromium.org, paul.kocialkowski@bootlin.com, kyungmin.park@samsung.com, boris.brezillon@collabora.com, linux-arm-kernel@lists.infradead.org, mchehab@kernel.org, ezequiel@collabora.com, linux-kernel@vger.kernel.org, m.szyprowski@samsung.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org RG5lIHRvcmVrLCAwMS4gb2t0b2JlciAyMDE5IG9iIDAwOjQzOjM0IENFU1QgamUgSGFucyBWZXJr 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