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\n\tFri, 03 Jul 2026 15:49:55 -0700 (PDT)", "From": "Bruce Allen <ballen4705@googlemail.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Bruce Allen <ballen4705@googlemail.com>", "Subject": "[PATCH v2 0/2] libcamera: Add SensorSequence request metadata\n\tcontrol", "Date": "Fri, 3 Jul 2026 23:48:15 +0100", "Message-ID": "<20260703224817.15650-1-ballen4705@googlemail.com>", "X-Mailer": "git-send-email 2.54.0", "In-Reply-To": "<20260626003712.26624-1-ballen4705@googlemail.com>", "References": "<20260626003712.26624-1-ballen4705@googlemail.com>", "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": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Hi,\n\nThis v2 series follows up on my v1 submission that exposed the Unicam\nfrontend sequence as an RPi vendor control [1], and Kieran's feedback that\nthis should be a standard metadata control across all platforms [2].\n\nThe series revives the approach from Kieran's 2021 RFC \"Request metadata:\nSensorSequence\" [3], updated for the current control_ids_core.yaml layout\nand additional pipelines. Compared with that original 8-patch series, this\nsubmission is limited to the control definition, pipeline plumbing, and\napplication documentation (no cam/qcam/gstreamer changes).\n\nChanges since v1:\n- Define controls::SensorSequence in control_ids_core.yaml (int64_t, out)\n instead of controls::rpi::SensorSequence in control_ids_rpi.yaml\n- Populate the control in every pipeline handler that already reports\n SensorTimestamp (simple, ipu3, rkisp1, rpi/vc4, rpi/pisp, mali-c55,\n imx8-isi, uvcvideo, vimc)\n- Document SensorSequence in the application developer guide\n\nMotivation (unchanged from v1): applications diagnosing frame loss need a\ncounter tied to sensor-side capture, not just delivered-frame or request-\nqueue sequence. Gaps in SensorSequence indicate frames that did not reach the\ncapture device stream before the previous request completed. Python bindings\nfollow from existing pycamera codegen.\n\nTested: patch applies cleanly to master @ 709ad59; builds with\n-Dpipelines=rpi/vc4 -Dipas=rpi/vc4 -Dpycamera=enabled. Verified on\nRaspberry Pi CM4 that monotonic SensorSequence detects dropped frames.\n\n[1] https://lists.libcamera.org/pipermail/libcamera-devel/2026-June/059669.html\n[2] https://lists.libcamera.org/pipermail/libcamera-devel/2026-June/059681.html\n[3] https://patchwork.libcamera.org/project/libcamera/list/?series=2822\n\nCheers,\nBruce Allen" }