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{
    "id": 14121,
    "url": "https://patchwork.libcamera.org/api/1.1/patches/14121/?format=api",
    "web_url": "https://patchwork.libcamera.org/patch/14121/",
    "project": {
        "id": 1,
        "url": "https://patchwork.libcamera.org/api/1.1/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": "<20211013154125.133419-8-jeanmichel.hautbois@ideasonboard.com>",
    "date": "2021-10-13T15:41:19",
    "name": "[libcamera-devel,07/13] ipa: ipu3: agc: Change analogue gain limits",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": false,
    "hash": "9cd6870228c7a10d06d8373e6efc94daeec211ae",
    "submitter": {
        "id": 75,
        "url": "https://patchwork.libcamera.org/api/1.1/people/75/?format=api",
        "name": "Jean-Michel Hautbois",
        "email": "jeanmichel.hautbois@ideasonboard.com"
    },
    "delegate": null,
    "mbox": "https://patchwork.libcamera.org/patch/14121/mbox/",
    "series": [
        {
            "id": 2623,
            "url": "https://patchwork.libcamera.org/api/1.1/series/2623/?format=api",
            "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=2623",
            "date": "2021-10-13T15:41:13",
            "name": "ipa: ipu3: Fix AGC bugs",
            "version": 1,
            "mbox": "https://patchwork.libcamera.org/series/2623/mbox/"
        }
    ],
    "comments": "https://patchwork.libcamera.org/api/patches/14121/comments/",
    "check": "pending",
    "checks": "https://patchwork.libcamera.org/api/patches/14121/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 867DDBDC71\n\tfor <parsemail@patchwork.libcamera.org>;\n\tWed, 13 Oct 2021 15:41:42 +0000 (UTC)",
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        ],
        "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=\"wWZbLqN2\"; dkim-atps=neutral",
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        "From": "Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>",
        "To": "libcamera-devel@lists.libcamera.org",
        "Date": "Wed, 13 Oct 2021 17:41:19 +0200",
        "Message-Id": "<20211013154125.133419-8-jeanmichel.hautbois@ideasonboard.com>",
        "X-Mailer": "git-send-email 2.30.2",
        "In-Reply-To": "<20211013154125.133419-1-jeanmichel.hautbois@ideasonboard.com>",
        "References": "<20211013154125.133419-1-jeanmichel.hautbois@ideasonboard.com>",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit",
        "Subject": "[libcamera-devel] [PATCH 07/13] ipa: ipu3: agc: Change analogue\n\tgain limits",
        "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": "The gains is currently set as a uint32_t while the analogue gain is\npassed as a double. We also have a default maximum analogue gain of 15\nwhich is quite high for a number of sensors.\n\nUse a maximum value of 8 which should really be configured by the IPA\nand not fixed as it is now. While at it make it a double.\n\nSigned-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>\n---\n src/ipa/ipu3/algorithms/agc.cpp | 12 ++++--------\n 1 file changed, 4 insertions(+), 8 deletions(-)",
    "diff": "diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp\nindex 2dd5c5c1..e58a8a8d 100644\n--- a/src/ipa/ipu3/algorithms/agc.cpp\n+++ b/src/ipa/ipu3/algorithms/agc.cpp\n@@ -30,14 +30,10 @@ static constexpr uint32_t kInitialFrameMinAECount = 4;\n /* Number of frames to wait between new gain/exposure estimations */\n static constexpr uint32_t kFrameSkipCount = 6;\n \n-/* Maximum ISO value for analogue gain */\n-static constexpr uint32_t kMinISO = 100;\n-static constexpr uint32_t kMaxISO = 1500;\n-\n /* Maximum analogue gain value\n  * \\todo grab it from a camera helper */\n-static constexpr uint32_t kMinGain = kMinISO / 100;\n-static constexpr uint32_t kMaxGain = kMaxISO / 100;\n+static constexpr double kMinGain = 1.0;\n+static constexpr double kMaxGain = 8.0;\n \n /* \\todo use calculated value based on sensor */\n static constexpr libcamera::utils::Duration kMinShutterSpeed = 100us;\n@@ -161,9 +157,9 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain)\n \t\tif (currentShutter < kMaxShutterSpeed) {\n \t\t\texposure = std::clamp(static_cast<uint32_t>(exposure * currentExposure_ / currentExposureNoDg_), minExposureLines_, maxExposureLines_);\n \t\t\tnewExposure = currentExposure_ / exposure;\n-\t\t\tgain = std::clamp(static_cast<uint32_t>(gain * currentExposure_ / newExposure), kMinGain, kMaxGain);\n+\t\t\tgain = std::clamp(static_cast<double>(gain * currentExposure_ / newExposure), kMinGain, kMaxGain);\n \t\t} else if (currentShutter >= kMaxShutterSpeed) {\n-\t\t\tgain = std::clamp(static_cast<uint32_t>(gain * currentExposure_ / currentExposureNoDg_), kMinGain, kMaxGain);\n+\t\t\tgain = std::clamp(static_cast<double>(gain * currentExposure_ / currentExposureNoDg_), kMinGain, kMaxGain);\n \t\t\tnewExposure = currentExposure_ / gain;\n \t\t\texposure = std::clamp(static_cast<uint32_t>(exposure * currentExposure_ / newExposure), minExposureLines_, maxExposureLines_);\n \t\t}\n",
    "prefixes": [
        "libcamera-devel",
        "07/13"
    ]
}