[{"id":39427,"web_url":"https://patchwork.libcamera.org/comment/39427/","msgid":"<178246215341.36676.4130947049734592629@ping.linuxembedded.co.uk>","date":"2026-06-26T08:22:33","subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Bruce,\n\nQuoting Bruce Allen (2026-06-26 01:37:10)\n> Hi,\n> \n> This tiny patch series adds a Raspberry Pi vendor metadata control\n> SensorSequence that exposes the Unicam frontend\n> FrameBuffer::metadata().sequence on completed requests (VC4 pipeline).\n\nThis is interesting work, and feels familiar because I looked at similar\nthings in the past:\n\nRequest metadata: SensorSequence\n - https://patchwork.libcamera.org/project/libcamera/list/?series=2822\n\n\nSequence Observer\n - https://patchwork.libcamera.org/project/libcamera/list/?series=3083\n\n\nI can't recall, but it felt/seemed like these patches didn't gain\ntraction. Perhaps your requirements could help drive an update.\n\n\n> Motivation: applications diagnosing frame loss need a counter tied to\n> frontend capture, not just delivered-frame or control-list\n> timing. Gaps in this sequence indicate frames that did not reach the\n> frontend stream before the previous request completed.\n\nI agree - I think that can be valuable information.\n\n\n> The control is defined in control_ids_rpi.yaml, set in vc4.cpp at\n> Unicam dequeue, and propagated in pipeline_base.cpp like\n> SensorTimestamp and FrameWallClock. Python bindings follow from\n> existing pycamera codegen.\n\nAnything like this should apply to all platforms. There's nothing RPi\nspecific about a sensor sequence number.\n\n--\nKieran\n\n\n> \n> Tested: builds on master @ 29eb112 with -Dpipelines=rpi/vc4\n> -Dipas=rpi/vc4 -Dpycamera=enabled; verified\n> libcamera.controls.rpi.SensorSequence imports from the staged\n> tree. Tested on Raspberry Pi CM4, correctly detects dropped frames.\n> \n> Cheers,\n> Bruce Allen","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id E2297C3261\n\tfor ;\n\tFri, 26 Jun 2026 08:22:39 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 2CF66658D6;\n\tFri, 26 Jun 2026 10:22:39 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E253B658D0\n\tfor ;\n\tFri, 26 Jun 2026 10:22:36 +0200 (CEST)","from monstersaurus.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 009C51E7;\n\tFri, 26 Jun 2026 10:21:55 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"YYt4+l4N\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1782462116;\n\tbh=0c+gKDXU/rolCcV1znbmpwEaee98IlbKJIdSANDTlnQ=;\n\th=In-Reply-To:References:Subject:From:To:Date:From;\n\tb=YYt4+l4N3MI5qqRpytdSIRPUgiEBSFAeX9weFBr+e6zxQLLUYXZGhJ2lPPWmxU4LU\n\tGL30g+Iv/PIDZAIu0R/67AgmtNWSETXNQmFnSuMKdtwQlWxctO71lUiCDdWVvc3C8X\n\t1+c2/CCeKU3E8PlLxg80IGL8Jbq04kjk1vVUy0XI=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20260626003712.26624-1-ballen4705@googlemail.com>","References":"<20260626003712.26624-1-ballen4705@googlemail.com>","Subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","From":"Kieran Bingham ","To":"Bruce Allen ,\n\tlibcamera-devel@lists.libcamera.org","Date":"Fri, 26 Jun 2026 09:22:33 +0100","Message-ID":"<178246215341.36676.4130947049734592629@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":39429,"web_url":"https://patchwork.libcamera.org/comment/39429/","msgid":"","date":"2026-06-26T09:00:31","subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","submitter":{"id":321,"url":"https://patchwork.libcamera.org/api/people/321/","name":"Bruce Allen","email":"ballen4705@googlemail.com"},"content":"Hi Kieran,\n\nthanks for picking up on this so quickly!\n\n>> This tiny patch series adds a Raspberry Pi vendor metadata control\n>> SensorSequence that exposes the Unicam frontend\n>> FrameBuffer::metadata().sequence on completed requests (VC4 pipeline).\n\n> This is interesting work, and feels familiar because I looked at similar\n> things in the past:\n> \n> Request metadata: SensorSequence\n> - https://patchwork.libcamera.org/project/libcamera/list/?series=2822\n> \n> Sequence Observer\n> - https://patchwork.libcamera.org/project/libcamera/list/?series=3083\n\nI saw those, and was surprised that they had not been taken up.\n\n> I can't recall, but it felt/seemed like these patches didn't gain\n> traction. Perhaps your requirements could help drive an update.\n\nTracking sensor drops is interesting: on my system there is a periodic \npattern of drops that I don't understand (yet). So IMO exposing this \ninformation will be helpful to others. And it's such low cost (a few \nlines of code, tens of nanoseconds of ops, a few bytes of memory) that I \ncan't see any reason NOT to.\n\n>> Motivation: applications diagnosing frame loss need a counter tied to\n>> frontend capture, not just delivered-frame or control-list\n>> timing. Gaps in this sequence indicate frames that did not reach the\n>> frontend stream before the previous request completed.\n\n> I agree - I think that can be valuable information.\n\n(:-) You (we) are \"preaching to the converted\".\n>> The control is defined in control_ids_rpi.yaml, set in vc4.cpp at\n>> Unicam dequeue, and propagated in pipeline_base.cpp like\n>> SensorTimestamp and FrameWallClock. Python bindings follow from\n>> existing pycamera codegen.\n\n> Anything like this should apply to all platforms. There's nothing RPi\n> specific about a sensor sequence number.\n\nI'd be happy with a more general solution, but I'm not set up to test \nthis more broadly than my RPI project.\n\nCheers,\n\tBruce","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 51AEAC3261\n\tfor ;\n\tFri, 26 Jun 2026 09:00:40 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 43993658D7;\n\tFri, 26 Jun 2026 11:00:39 +0200 (CEST)","from mail-ed1-x534.google.com (mail-ed1-x534.google.com\n\t[IPv6:2a00:1450:4864:20::534])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 64C8A658D0\n\tfor ;\n\tFri, 26 Jun 2026 11:00:38 +0200 (CEST)","by mail-ed1-x534.google.com with SMTP id\n\t4fb4d7f45d1cf-695f539fc8cso1529184a12.0\n\tfor ;\n\tFri, 26 Jun 2026 02:00:38 -0700 (PDT)","from [192.168.123.201] (p5ddcc513.dip0.t-ipconnect.de.\n\t[93.220.197.19]) by smtp.gmail.com with ESMTPSA id\n\ta640c23a62f3a-c11fbe6220esm309041566b.45.2026.06.26.02.00.34\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tFri, 26 Jun 2026 02:00:35 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tFri, 26 Jun 2026 02:00:36 -0700 (PDT)","Message-ID":"","Date":"Fri, 26 Jun 2026 10:00:31 +0100","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","To":"Kieran Bingham ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20260626003712.26624-1-ballen4705@googlemail.com>\n\t<178246215341.36676.4130947049734592629@ping.linuxembedded.co.uk>","Content-Language":"en-US","From":"Bruce Allen ","In-Reply-To":"<178246215341.36676.4130947049734592629@ping.linuxembedded.co.uk>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":39582,"web_url":"https://patchwork.libcamera.org/comment/39582/","msgid":"<36980758-4598-42a3-a5aa-2caf9bfabe27@googlemail.com>","date":"2026-07-05T13:58:39","subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","submitter":{"id":321,"url":"https://patchwork.libcamera.org/api/people/321/","name":"Bruce Allen","email":"ballen4705@googlemail.com"},"content":"Hi Kieran,\n\nbased on your feedback, I've posted v2 of this patch, which makes \nSensorSequence a standard metadata control across all pipeline handlers \nthat provide SensorTimestamp.\n\nFor the record, v2 is here:\nhttps://lists.libcamera.org/pipermail/libcamera-devel/2026-July/059979.html\n\nCheers,\n\tBruce","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id EA7F3C3303\n\tfor ;\n\tSun, 5 Jul 2026 13:58:44 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 23C9365FE9;\n\tSun, 5 Jul 2026 15:58:44 +0200 (CEST)","from mail-wr1-x436.google.com (mail-wr1-x436.google.com\n\t[IPv6:2a00:1450:4864:20::436])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 40C1A65FBE\n\tfor ;\n\tSun, 5 Jul 2026 15:58:42 +0200 (CEST)","by mail-wr1-x436.google.com with SMTP id\n\tffacd0b85a97d-470174001a0so951348f8f.0\n\tfor ;\n\tSun, 05 Jul 2026 06:58:42 -0700 (PDT)","from [192.168.123.201] (p5ddcc513.dip0.t-ipconnect.de.\n\t[93.220.197.19]) by smtp.gmail.com with ESMTPSA id\n\tffacd0b85a97d-47aa039bcdasm16844476f8f.21.2026.07.05.06.58.40\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tSun, 05 Jul 2026 06:58:41 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tSun, 05 Jul 2026 06:58:41 -0700 (PDT)","Message-ID":"<36980758-4598-42a3-a5aa-2caf9bfabe27@googlemail.com>","Date":"Sun, 5 Jul 2026 15:58:39 +0200","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","From":"Bruce Allen ","To":"Kieran Bingham ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20260626003712.26624-1-ballen4705@googlemail.com>\n\t<178246215341.36676.4130947049734592629@ping.linuxembedded.co.uk>\n\t","Content-Language":"en-US","In-Reply-To":"","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}}]