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{ "id": 14310, "url": "https://patchwork.libcamera.org/api/patches/14310/?format=api", "web_url": "https://patchwork.libcamera.org/patch/14310/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20211026082142.69023-1-jeanmichel.hautbois@ideasonboard.com>", "date": "2021-10-26T08:21:42", "name": "[libcamera-devel] ipa: ipu3: agc: Clamp shutter speed", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "316c23166d870f07eb95098ceff71f68ca90a4f4", "submitter": { "id": 75, "url": "https://patchwork.libcamera.org/api/people/75/?format=api", "name": "Jean-Michel Hautbois", "email": "jeanmichel.hautbois@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/14310/mbox/", "series": [ { "id": 2655, "url": "https://patchwork.libcamera.org/api/series/2655/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2655", "date": "2021-10-26T08:21:42", "name": "[libcamera-devel] ipa: ipu3: agc: Clamp shutter speed", "version": 1, "mbox": "https://patchwork.libcamera.org/series/2655/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/14310/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/14310/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "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 70C97BF415\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 26 Oct 2021 08:21:47 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id CDCFD64878;\n\tTue, 26 Oct 2021 10:21:46 +0200 (CEST)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 36E3760123\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 26 Oct 2021 10:21:46 +0200 (CEST)", "from tatooine.ideasonboard.com (unknown\n\t[IPv6:2a01:e0a:169:7140:dce3:eb54:18d7:6f3d])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id C20103F0;\n\tTue, 26 Oct 2021 10:21:45 +0200 (CEST)" ], "Authentication-Results": "lancelot.ideasonboard.com;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"pSANcc6D\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1635236505;\n\tbh=PtVlSlsFtLGpF6G6mzj99vEfbLejpButPp1RBv8o44Q=;\n\th=From:To:Cc:Subject:Date:From;\n\tb=pSANcc6DApN71ZMkj8x+ujT7lLsI0rVtDIqOcl2Qt0gtyXql8MhwbA3i1NGiiwCZv\n\tE0+1da7lJci49fe3W2WX3R0pvDz18RtsOKVXTZSJNrXwhGX3lkMwUmOh2ze9inuNSD\n\tnaT8LsVtFfpOq2j9WYMaAYMhV+jvkxYeHDV9c4og=", "From": "Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Date": "Tue, 26 Oct 2021 10:21:42 +0200", "Message-Id": "<20211026082142.69023-1-jeanmichel.hautbois@ideasonboard.com>", "X-Mailer": "git-send-email 2.32.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [PATCH] ipa: ipu3: agc: Clamp shutter speed", "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": "In case the maximum exposure received from the sensor is very high, we\ncan have a very high shutter speed with a small analogue gain, and it\nmay result in very slow framerate. We are not really supporting it for\nthe moment, so clamp the shutter speed to an arbitrary value of 60ms.\n\nSigned-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>\n---\n src/ipa/ipu3/algorithms/agc.cpp | 6 +++++-\n 1 file changed, 5 insertions(+), 1 deletion(-)", "diff": "diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp\nindex 6c151232..5927b5d3 100644\n--- a/src/ipa/ipu3/algorithms/agc.cpp\n+++ b/src/ipa/ipu3/algorithms/agc.cpp\n@@ -34,6 +34,9 @@ static constexpr uint32_t kFrameSkipCount = 6;\n static constexpr double kMinAnalogueGain = 1.0;\n static constexpr double kMaxAnalogueGain = 8.0;\n \n+/* Maximum shutter speed allowed */\n+static constexpr utils::Duration kMaxShutterSpeed = 60ms;\n+\n /* Histogram constants */\n static constexpr uint32_t knumHistogramBins = 256;\n static constexpr double kEvGainTarget = 0.5;\n@@ -54,7 +57,8 @@ int Agc::configure(IPAContext &context, const IPAConfigInfo &configInfo)\n \n \t/* \\todo replace the exposure in lines storage with time based ones. */\n \tminExposureLines_ = context.configuration.agc.minShutterSpeed / lineDuration_;\n-\tmaxExposureLines_ = context.configuration.agc.maxShutterSpeed / lineDuration_;\n+\tmaxExposureLines_ = std::min(context.configuration.agc.maxShutterSpeed / lineDuration_,\n+\t\t\t\t kMaxShutterSpeed / lineDuration_);\n \n \tminAnalogueGain_ = std::max(context.configuration.agc.minAnalogueGain, kMinAnalogueGain);\n \tmaxAnalogueGain_ = std::min(context.configuration.agc.maxAnalogueGain, kMaxAnalogueGain);\n", "prefixes": [ "libcamera-devel" ] }