{"id":27037,"url":"https://patchwork.libcamera.org/api/covers/27037/?format=json","web_url":"https://patchwork.libcamera.org/cover/27037/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260626003712.26624-1-ballen4705@googlemail.com>","date":"2026-06-26T00:37:10","name":"[v1,0/2] rpi: Expose Unicam frontend sequence as SensorSequence metadata","submitter":{"id":321,"url":"https://patchwork.libcamera.org/api/people/321/?format=json","name":"Bruce Allen","email":"ballen4705@googlemail.com"},"mbox":"https://patchwork.libcamera.org/cover/27037/mbox/","series":[{"id":6016,"url":"https://patchwork.libcamera.org/api/series/6016/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=6016","date":"2026-06-26T00:37:10","name":"rpi: Expose Unicam frontend sequence as SensorSequence metadata","version":1,"mbox":"https://patchwork.libcamera.org/series/6016/mbox/"}],"comments":"https://patchwork.libcamera.org/api/covers/27037/comments/","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 CC0F5C3264\n\tfor ;\n\tFri, 26 Jun 2026 00:37:17 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id EBA80658CD;\n\tFri, 26 Jun 2026 02:37:16 +0200 (CEST)","from mail-wr1-x429.google.com (mail-wr1-x429.google.com\n\t[IPv6:2a00:1450:4864:20::429])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 63DA1623CB\n\tfor ;\n\tFri, 26 Jun 2026 02:37:15 +0200 (CEST)","by mail-wr1-x429.google.com with SMTP id\n\tffacd0b85a97d-46e92b75390so325735f8f.3\n\tfor ;\n\tThu, 25 Jun 2026 17:37:15 -0700 (PDT)","from localhost.localdomain (p5ddcc513.dip0.t-ipconnect.de.\n\t[93.220.197.19]) by smtp.gmail.com with ESMTPSA id\n\tffacd0b85a97d-46f0db007b3sm762055f8f.2.2026.06.25.17.37.13\n\tfor \n\t(version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n\tThu, 25 Jun 2026 17:37:14 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tThu, 25 Jun 2026 17:37:14 -0700 (PDT)","From":"Bruce Allen ","To":"libcamera-devel@lists.libcamera.org","Subject":"[PATCH v1 0/2] rpi: Expose Unicam frontend sequence as\n\tSensorSequence metadata","Date":"Fri, 26 Jun 2026 02:37:10 +0200","Message-ID":"<20260626003712.26624-1-ballen4705@googlemail.com>","X-Mailer":"git-send-email 2.54.0","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","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\" "},"content":"Hi,\n\nThis tiny patch series adds a Raspberry Pi vendor metadata control\nSensorSequence that exposes the Unicam frontend\nFrameBuffer::metadata().sequence on completed requests (VC4 pipeline).\n\nMotivation: applications diagnosing frame loss need a counter tied to\nfrontend capture, not just delivered-frame or control-list\ntiming. Gaps in this sequence indicate frames that did not reach the\nfrontend stream before the previous request completed.\n\nThe control is defined in control_ids_rpi.yaml, set in vc4.cpp at\nUnicam dequeue, and propagated in pipeline_base.cpp like\nSensorTimestamp and FrameWallClock. Python bindings follow from\nexisting pycamera codegen.\n\nTested: builds on master @ 29eb112 with -Dpipelines=rpi/vc4\n-Dipas=rpi/vc4 -Dpycamera=enabled; verified\nlibcamera.controls.rpi.SensorSequence imports from the staged\ntree. Tested on Raspberry Pi CM4, correctly detects dropped frames.\n\nCheers,\nBruce Allen"}