From patchwork Fri Oct 22 07:32:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Michel Hautbois X-Patchwork-Id: 14242 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 4B3B0C324E for ; Fri, 22 Oct 2021 07:33:05 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 1924F68F6E; Fri, 22 Oct 2021 09:33:04 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="U8CwYvZw"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 824FE68F57 for ; Fri, 22 Oct 2021 09:32:55 +0200 (CEST) Received: from tatooine.ideasonboard.com (unknown [IPv6:2a01:e0a:169:7140:22cc:3af6:5ccb:8367]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 3C5BB89A; Fri, 22 Oct 2021 09:32:55 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1634887975; bh=6jyQp2VcDpoE14IpVTi4Vd171ozQMo+DRVnwXyo9WIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U8CwYvZw4LrUuL+bdYRFGCTh5QzpcWvJZSFDgmC36DWnMyJY3fNIZRqHN15b7V4QI BPVryRw08Qm+OZ9WAxSMn+GlfZKZdFgvM82bFtluujrOT+3WVKaTrDW2aZsz6lCoH0 RwUPRQuLaVBr+KIC0BJacQ+yESCkJrSuu/fqJ/sY= From: Jean-Michel Hautbois To: libcamera-devel@lists.libcamera.org Date: Fri, 22 Oct 2021 09:32:42 +0200 Message-Id: <20211022073249.35084-8-jeanmichel.hautbois@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211022073249.35084-1-jeanmichel.hautbois@ideasonboard.com> References: <20211022073249.35084-1-jeanmichel.hautbois@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v4 07/14] ipa: ipu3: agc: Change analogue gain limits X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" The gains are currently set as a uint32_t while the analogue gain is passed as a double. We also have a default maximum analogue gain of 15 which is quite high for a number of sensors. Use a maximum value of 8 which should really be configured by the IPA and not fixed as it is now. While at it make it a double. Signed-off-by: Jean-Michel Hautbois Reviewed-by: Kieran Bingham Reviewed-by: Laurent Pinchart --- src/ipa/ipu3/algorithms/agc.cpp | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/src/ipa/ipu3/algorithms/agc.cpp b/src/ipa/ipu3/algorithms/agc.cpp index 58872410..984aed53 100644 --- a/src/ipa/ipu3/algorithms/agc.cpp +++ b/src/ipa/ipu3/algorithms/agc.cpp @@ -30,14 +30,10 @@ static constexpr uint32_t kInitialFrameMinAECount = 4; /* Number of frames to wait between new gain/exposure estimations */ static constexpr uint32_t kFrameSkipCount = 6; -/* Maximum ISO value for analogue gain */ -static constexpr uint32_t kMinISO = 100; -static constexpr uint32_t kMaxISO = 1500; - /* Maximum analogue gain value * \todo grab it from a camera helper */ -static constexpr uint32_t kMinGain = kMinISO / 100; -static constexpr uint32_t kMaxGain = kMaxISO / 100; +static constexpr double kMinGain = 1.0; +static constexpr double kMaxGain = 8.0; /* Histogram constants */ static constexpr uint32_t knumHistogramBins = 256; @@ -166,9 +162,11 @@ void Agc::lockExposureGain(uint32_t &exposure, double &gain) minExposureLines_, maxExposureLines_); newExposure = currentExposure_ / exposure; - gain = std::clamp(static_cast(gain * currentExposure_ / newExposure), kMinGain, kMaxGain); + gain = std::clamp(gain * currentExposure_ / newExposure, + kMinGain, kMaxGain); } else { - gain = std::clamp(static_cast(gain * currentExposure_ / currentExposureNoDg_), kMinGain, kMaxGain); + gain = std::clamp(gain * currentExposure_ / currentExposureNoDg_, + kMinGain, kMaxGain); newExposure = currentExposure_ / gain; exposure = std::clamp(exposure * currentExposure_ / newExposure, minExposureLines_,