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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=no 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 68890C432C2 for ; Wed, 25 Sep 2019 18:19:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 315E221D7A for ; Wed, 25 Sep 2019 18:19:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2440003AbfIYSTt (ORCPT ); Wed, 25 Sep 2019 14:19:49 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:60792 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437692AbfIYSTt (ORCPT ); Wed, 25 Sep 2019 14:19:49 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: koike) with ESMTPSA id D540628D21C Subject: Re: [ANN] Media sessions in Lyon in October: codecs To: Jacopo Mondi , Hans Verkuil Cc: Linux Media Mailing List , Boris Brezillon , Alexandre Courbot , Nicolas Dufresne , Tomasz Figa , Ezequiel Garcia , Daniel Gomez , Dafna Hirschfeld , Eugen Hristev , Paul Kocialkowski , Michael Tretter , Jacopo Mondi , Laurent Pinchart References: <20190923150213.2ub26ys4mhpp2hm5@uno.localdomain> From: Helen Koike Openpgp: preference=signencrypt Autocrypt: addr=helen.koike@collabora.com; keydata= mQINBFmOMD4BEADb2nC8Oeyvklh+ataw2u/3mrl+hIHL4WSWtii4VxCapl9+zILuxFDrxw1p XgF3cfx7g9taWBrmLE9VEPwJA6MxaVnQuDL3GXxTxO/gqnOFgT3jT+skAt6qMvoWnhgurMGH wRaA3dO4cFrDlLsZIdDywTYcy7V2bou81ItR5Ed6c5UVX7uTTzeiD/tUi8oIf0XN4takyFuV Rf09nOhi24bn9fFN5xWHJooFaFf/k2Y+5UTkofANUp8nn4jhBUrIr6glOtmE0VT4pZMMLT63 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JkgmmesIAw8mpI6EeLmReUJLasz8QkzhZIC7t5rGlQI94GQG3Jg2dC+kpaGWOaT5G4FVMcBj iR1nXfMxENVYnM5ag7mBZyD/kru5W1Uj34L6AFaDMXFPwedSCpzzqUiHb0f+nYkfOodf5xy0 46+3THy/NUS/ZZp/rI4F7Y77+MQPVg7vARfHHX1AxYUKfRVW5j88QUB70txn8Vgi1tDrOr4J eD+xr0CvIGa5lKqgQacQtGkpOpJ8zY4ObSvpNubey/qYUE3DCXD0n2Xxk4muTvqlkFpOYA== Message-ID: Date: Wed, 25 Sep 2019 15:19:38 -0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190923150213.2ub26ys4mhpp2hm5@uno.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 9/23/19 12:02 PM, Jacopo Mondi wrote: > Hi Hans, > > On Mon, Sep 23, 2019 at 04:12:55PM +0200, Hans Verkuil wrote: >> Hi all, >> >> Since we have three separate half-day sessions for different topics I decided >> to split the announcement for this in three emails as well, so these things >> can be discussed in separate threads. >> >> All sessions are in room Terreaux VIP Lounge - Level 0. >> There is a maximum of 15 people. >> >> The first session deals with the codec API and is on Tuesday morning from >> 8:30 (tentative, might change) to 12:00 (we have to vacate the room at that >> time). >> >> Confirmed attendees for this session: >> >> Boris Brezillon >> Alexandre Courbot >> Nicolas Dufresne >> Tomasz Figa >> Ezequiel Garcia >> Daniel Gomez >> Dafna Hirschfeld >> Eugen Hristev >> Paul Kocialkowski >> Helen Koike >> Michael Tretter >> Hans Verkuil >> >> Tentative: >> >> Laurent Pinchart >> Jacopo Mondi >> >> Jacopo, please confirm if you want to attend this session. I didn't find >> an email with explicit confirmation, so it was probably done via irc. But since >> this session is getting close to capacity I would prefer to keep attendance to >> those are actually working with codecs (or will work with it in the near future). > > I'm not really working on codecs, so if you're running almost at full > capacity please feel free to re-assign my seat. Same here, feel free to re-assign my seat. Thanks, Helen > > If there are free seats I might flock in, but without contributing too > much to the discussions :) > > Thanks > j > >> >> If I missed someone, or you are on the list but won't attend after all, then >> please let me know. >> >> >> >> Agenda: >> >> - Status of any pending patches related to codec support. >> >> - Requirements of moving codec drivers out of staging. >> >> - Finalize the stateful encoder API. There are two pieces that need >> to be defined: >> >> 1) Setting the frame rate so bitrate control can make sense, since >> they need to know this information. This is also relevant for the >> stateless codec (and this may have to change on a per-frame basis >> for stateless codecs!). >> >> This can either be implemented via ENUM_FRAMEINTERVALS for the coded >> pixelformats and S_PARM support, or we just add a new control for this. >> E.g. V4L2_CID_MPEG_VIDEO_FRAME_INTERVAL (or perhaps FRAME_RATE). If we >> go for a control, then we need to consider the unit. We can use a >> fraction as well. See this series that puts in the foundation for that: >> https://patchwork.linuxtv.org/cover/58857/ >> >> I am inclined to go with a control, since the semantics don't really >> match ENUM_FRAMEINTERVALS/S_PARM. These ioctls still need to be supported >> for legacy drivers. Open question: some drivers (mediatek, hva, coda) >> require S_PARM(OUTPUT), some (venus) allow both S_PARM(CAPTURE) and >> S_PARM(OUTPUT). I am inclined to allow both since this is not a CAPTURE >> vs OUTPUT thing, it is global to both queues. >> >> 2) Interactions between OUTPUT and CAPTURE formats. >> >> The main problem is what to do if the capture sizeimage is too small >> for the OUTPUT resolution when streaming starts. >> >> Proposal: width and height of S_FMT(OUTPUT) are used to >> calculate a minimum sizeimage (app may request more). This is >> driver-specific. (Is it? Or is this codec-specific?) >> >> V4L2_FMT_FLAG_FIXED_RESOLUTION is always set for codec formats >> for the encoder (i.e. we don't support mid-stream resolution >> changes for now) and V4L2_EVENT_SOURCE_CHANGE is not >> supported. See https://patchwork.linuxtv.org/patch/56478/ for >> the patch adding this flag. >> >> Of course, if we start to support mid-stream resolution >> changes (or other changes that require a source change event), >> then this flag should be dropped by the encoder driver and >> documentation on how to handle the source change event should >> be documented in the encoder spec. I prefer to postpone this >> until we have an encoder than can actually do mid-stream >> resolution changes. >> >> If sizeimage of the OUTPUT is too small for the CAPTURE >> resolution and V4L2_EVENT_SOURCE_CHANGE is not supported, >> then the second STREAMON (either CAPTURE or OUTPUT) will >> return -ENOMEM since there is not enough memory to do the >> encode. >> >> If V4L2_FMT_FLAG_FIXED_RESOLUTION is set (i.e. that should >> be the case for all current encoders), then any bitrate controls >> will be limited in range to what the current state (CAPTURE and >> OUTPUT formats and frame rate) supports. >> >> - Stateless encoders? >> >> - Anything else? (I have a feeling I missed a codec-related topic, but >> I can't find it in my mailbox) >> >> Regards, >> >> Hans