From patchwork Thu Nov 4 13:58:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Plowman X-Patchwork-Id: 14460 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 B58FEBDB1C for ; Thu, 4 Nov 2021 13:58:30 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id AA89160348; Thu, 4 Nov 2021 14:58:29 +0100 (CET) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=raspberrypi.com header.i=@raspberrypi.com header.b="MZ5iYReB"; dkim-atps=neutral Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 2F8ED60346 for ; Thu, 4 Nov 2021 14:58:25 +0100 (CET) Received: by mail-wr1-x42d.google.com with SMTP id d3so8751836wrh.8 for ; Thu, 04 Nov 2021 06:58:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raspberrypi.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ron3Qwrj+ZdHUA2wy9RhvrSwsJz/Iu9EfWpAou0UGIc=; b=MZ5iYReBhcfQeBwZSLC80+RjTWvuzU4u1e10phNzRKCVepTwFYhT6bdSXe2nmCYltN 8JTHxqT2LQXcjJ5c7ODlSSfokuXFO/3v+38SJFzrJh0sUcHVr/uZVarrpjJvkcYE1pjg WAGM2Ukk7MgNIIUk+ajskLaKfGg3Dlaav9ry+gVlUoPdOaDmcXq+1G57tMY332BN69A0 kpcfOgJLdL+JFGeeK3KHboIbrkJUhbWIOWquGaqttD77bPjoeIUchieB1LezId4gFkB5 An1kbeDUgMRgDRKCSlvL7Fl2Zckx8SFvb50xJZVXY/8Ch+dR9vk8t9FkrULx9STGGBKF iTHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ron3Qwrj+ZdHUA2wy9RhvrSwsJz/Iu9EfWpAou0UGIc=; b=DbhwKN9dNl69GdilxBc2uFOiNTHeHpJPCldRtqNb+K3vERVGHTGlgwOsjrYsCo2J5b pc/UPtcQq8YgX/8wdK4s2rMlS4oGTpXX673fOwWD+nX9Rb8oEobbyQZBRTsWx4V4JJ8g 5shCt69SqdH3tHtAB73se0t39BAjksWJd0A5crZQ8EJTlXH2V37V6EmnMuRSui0+Swo0 1LSLOJBjZ0Yt5DecxQcli6bU0SvnX2AoOof0FVnuBvDoC07Yd6GeiKiC1OESSEmZymxp LfHWwi0+kZtb/B/Sbk+2EeDfHEO/PXTrlnni6LNuTdelvy5sAG+VZHtlH3lwtGC3gmQ3 J/Hw== X-Gm-Message-State: AOAM530fc1u2zWw1AEUFFhiLFT3ESlV8kLv3A6CPSxRTgKFTRmmdwNGQ WtrEe6UyRv07c+fiGKrENPvaYuqCakM63A== X-Google-Smtp-Source: ABdhPJxOCtTkM4hoJrdWMcH+HTpsucKGzXjRc8g2CvitBO1T1UT3i8sKyFeDhzvpiA1nLNpeayuADw== X-Received: by 2002:a05:6000:186e:: with SMTP id d14mr12820615wri.376.1636034304498; Thu, 04 Nov 2021 06:58:24 -0700 (PDT) Received: from pi4-davidp.pitowers.org ([2a00:1098:3142:14:1ce1:9965:4328:89c4]) by smtp.gmail.com with ESMTPSA id i20sm2264736wmq.41.2021.11.04.06.58.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Nov 2021 06:58:24 -0700 (PDT) From: David Plowman To: libcamera-devel@lists.libcamera.org Date: Thu, 4 Nov 2021 13:58:01 +0000 Message-Id: <20211104135805.5269-4-david.plowman@raspberrypi.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211104135805.5269-1-david.plowman@raspberrypi.com> References: <20211104135805.5269-1-david.plowman@raspberrypi.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v5 3/7] libcamera: Convert between ColorSpace class and V4L2 formats 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" These methods are added to the base V4L2Device class so that they can be shared both by the video device class and subdevices. With the ColorSpace class, the color space and related other fields are stored together, corresponding to a number of fields in the various different V4L2 format structures. Template methods are therefore a convenient implementation. Note that we must explicitly instantiate the templates that will be needed. Signed-off-by: David Plowman --- include/libcamera/internal/v4l2_device.h | 7 + src/libcamera/v4l2_device.cpp | 171 +++++++++++++++++++++++ 2 files changed, 178 insertions(+) diff --git a/include/libcamera/internal/v4l2_device.h b/include/libcamera/internal/v4l2_device.h index f21bc370..24fc4984 100644 --- a/include/libcamera/internal/v4l2_device.h +++ b/include/libcamera/internal/v4l2_device.h @@ -17,6 +17,7 @@ #include #include +#include #include namespace libcamera { @@ -44,6 +45,12 @@ public: void updateControlInfo(); + template + static ColorSpace toColorSpace(const T &v4l2Format); + + template + static int fromColorSpace(const ColorSpace &colorSpace, T &v4l2Format); + protected: V4L2Device(const std::string &deviceNode); ~V4L2Device(); diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp index 9c783c9c..34ec2bf3 100644 --- a/src/libcamera/v4l2_device.cpp +++ b/src/libcamera/v4l2_device.cpp @@ -16,6 +16,8 @@ #include #include +#include + #include #include #include @@ -731,4 +733,173 @@ void V4L2Device::eventAvailable() frameStart.emit(event.u.frame_sync.frame_sequence); } +static const std::map v4l2ToColorSpace = { + { V4L2_COLORSPACE_RAW, ColorSpace::Raw }, + { V4L2_COLORSPACE_JPEG, ColorSpace::Jpeg }, + { V4L2_COLORSPACE_SRGB, ColorSpace::Jpeg }, + { V4L2_COLORSPACE_SMPTE170M, ColorSpace::Smpte170m }, + { V4L2_COLORSPACE_REC709, ColorSpace::Rec709 }, + { V4L2_COLORSPACE_BT2020, ColorSpace::Rec2020 }, +}; + +static const std::map v4l2ToYcbcrEncoding = { + { V4L2_YCBCR_ENC_601, ColorSpace::YcbcrEncoding::Rec601 }, + { V4L2_YCBCR_ENC_709, ColorSpace::YcbcrEncoding::Rec709 }, + { V4L2_YCBCR_ENC_BT2020, ColorSpace::YcbcrEncoding::Rec2020 }, +}; + +static const std::map v4l2ToTransferFunction = { + { V4L2_XFER_FUNC_NONE, ColorSpace::TransferFunction::Linear }, + { V4L2_XFER_FUNC_SRGB, ColorSpace::TransferFunction::Srgb }, + { V4L2_XFER_FUNC_709, ColorSpace::TransferFunction::Rec709 }, +}; + +static const std::map v4l2ToRange = { + { V4L2_QUANTIZATION_FULL_RANGE, ColorSpace::Range::Full }, + { V4L2_QUANTIZATION_LIM_RANGE, ColorSpace::Range::Limited }, +}; + +static const std::vector> colorSpaceToV4l2 = { + { ColorSpace::Raw, V4L2_COLORSPACE_RAW }, + { ColorSpace::Jpeg, V4L2_COLORSPACE_JPEG }, + { ColorSpace::Smpte170m, V4L2_COLORSPACE_SMPTE170M }, + { ColorSpace::Rec709, V4L2_COLORSPACE_REC709 }, + { ColorSpace::Rec2020, V4L2_COLORSPACE_BT2020 }, +}; + +static const std::map primariesToV4l2 = { + { ColorSpace::Primaries::Raw, V4L2_COLORSPACE_RAW }, + { ColorSpace::Primaries::Smpte170m, V4L2_COLORSPACE_SMPTE170M }, + { ColorSpace::Primaries::Rec709, V4L2_COLORSPACE_REC709 }, + { ColorSpace::Primaries::Rec2020, V4L2_COLORSPACE_BT2020 }, +}; + +static const std::map ycbcrEncodingToV4l2 = { + { ColorSpace::YcbcrEncoding::Rec601, V4L2_YCBCR_ENC_601 }, + { ColorSpace::YcbcrEncoding::Rec709, V4L2_YCBCR_ENC_709 }, + { ColorSpace::YcbcrEncoding::Rec2020, V4L2_YCBCR_ENC_BT2020 }, +}; + +static const std::map transferFunctionToV4l2 = { + { ColorSpace::TransferFunction::Linear, V4L2_XFER_FUNC_NONE }, + { ColorSpace::TransferFunction::Srgb, V4L2_XFER_FUNC_SRGB }, + { ColorSpace::TransferFunction::Rec709, V4L2_XFER_FUNC_709 }, +}; + +static const std::map rangeToV4l2 = { + { ColorSpace::Range::Full, V4L2_QUANTIZATION_FULL_RANGE }, + { ColorSpace::Range::Limited, V4L2_QUANTIZATION_LIM_RANGE }, +}; + +/** + * \brief Convert the color space fields in a V4L2 format to a ColorSpace + * \param[in] v4l2Format A V4L2 format containing color space information + * + * The colorspace, ycbcr_enc, xfer_func and quantization fields within a + * V4L2 format structure are converted to a corresponding ColorSpace. + * + * If any V4L2 fields are not recognised those are marked as undefined in + * the ColorSpace, but other fields are still initialised where possible. + * This situation can be detected using the returned value's + * ColorSpace::isFullyDefined() method. + * + * \return The ColorSpace corresponding to the input V4L2 format + */ +template +ColorSpace V4L2Device::toColorSpace(const T &v4l2Format) +{ + ColorSpace colorSpace; + + auto itColor = v4l2ToColorSpace.find(v4l2Format.colorspace); + if (itColor != v4l2ToColorSpace.end()) + colorSpace = itColor->second; + + auto itYcbcrEncoding = v4l2ToYcbcrEncoding.find(v4l2Format.ycbcr_enc); + if (itYcbcrEncoding != v4l2ToYcbcrEncoding.end()) + colorSpace.ycbcrEncoding = itYcbcrEncoding->second; + + auto itTransfer = v4l2ToTransferFunction.find(v4l2Format.xfer_func); + if (itTransfer != v4l2ToTransferFunction.end()) + colorSpace.transferFunction = itTransfer->second; + + auto itRange = v4l2ToRange.find(v4l2Format.quantization); + if (itRange != v4l2ToRange.end()) + colorSpace.range = itRange->second; + + return colorSpace; +} + +template ColorSpace V4L2Device::toColorSpace(const struct v4l2_pix_format &); +template ColorSpace V4L2Device::toColorSpace(const struct v4l2_pix_format_mplane &); +template ColorSpace V4L2Device::toColorSpace(const struct v4l2_mbus_framefmt &); + +/** + * \brief Fill in the color space fields of a V4L2 format from a ColorSpace + * \param[in] colorSpace The ColorSpace to be converted + * \param[out] v4l2Format A V4L2 format containing color space information + * + * The colorspace, ycbcr_enc, xfer_func and quantization fields within a + * V4L2 format structure are filled in from a corresponding ColorSpace. + * + * An error is returned if any of the V4L2 fields do not support the + * value given in the ColorSpace. Such fields are set to the V4L2 + * "default" values, but all other fields are still filled in where + * possible. + * + * \return 0 on success or a negative error code otherwise + */ +template +int V4L2Device::fromColorSpace(const ColorSpace &colorSpace, T &v4l2Format) +{ + int ret = 0; + + v4l2Format.colorspace = V4L2_COLORSPACE_DEFAULT; + v4l2Format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; + v4l2Format.xfer_func = V4L2_XFER_FUNC_DEFAULT; + v4l2Format.quantization = V4L2_QUANTIZATION_DEFAULT; + + auto itColor = std::find_if(colorSpaceToV4l2.begin(), colorSpaceToV4l2.end(), + [&colorSpace](const auto &item) { + return colorSpace == item.first; + }); + if (itColor != colorSpaceToV4l2.end()) { + v4l2Format.colorspace = itColor->second; + return ret; + } + + /* + * If the colorSpace doesn't precisely match a standard color space, + * then we must choose a V4L2 colorspace with matching primaries. + */ + auto itPrimaries = primariesToV4l2.find(colorSpace.primaries); + if (itPrimaries != primariesToV4l2.end()) + v4l2Format.colorspace = itPrimaries->second; + else + ret = -1; + + auto itYcbcrEncoding = ycbcrEncodingToV4l2.find(colorSpace.ycbcrEncoding); + if (itYcbcrEncoding != ycbcrEncodingToV4l2.end()) + v4l2Format.ycbcr_enc = itYcbcrEncoding->second; + else + ret = -1; + + auto itTransfer = transferFunctionToV4l2.find(colorSpace.transferFunction); + if (itTransfer != transferFunctionToV4l2.end()) + v4l2Format.xfer_func = itTransfer->second; + else + ret = -1; + + auto itRange = rangeToV4l2.find(colorSpace.range); + if (itRange != rangeToV4l2.end()) + v4l2Format.quantization = itRange->second; + else + ret = -1; + + return ret; +} + +template int V4L2Device::fromColorSpace(const ColorSpace &, struct v4l2_pix_format &); +template int V4L2Device::fromColorSpace(const ColorSpace &, struct v4l2_pix_format_mplane &); +template int V4L2Device::fromColorSpace(const ColorSpace &, struct v4l2_mbus_framefmt &); + } /* namespace libcamera */