libcamera/jmondi/libcamera.git - Jacopo Mondi's clone of libcamera

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/* SPDX-License-Identifier: LGPL-2.1-or-later */ /* * Copyright (C) 2019, Google Inc. * * v4l2_subdevice.cpp - V4L2 Subdevice */ #include "libcamera/internal/v4l2_subdevice.h" #include <fcntl.h> #include <iomanip> #include <sstream> #include <string.h> #include <sys/ioctl.h> #include <unistd.h> #include <linux/media-bus-format.h> #include <linux/v4l2-subdev.h> #include <libcamera/geometry.h> #include "libcamera/internal/log.h" #include "libcamera/internal/media_device.h" #include "libcamera/internal/media_object.h" #include "libcamera/internal/utils.h" /** * \file v4l2_subdevice.h * \brief V4L2 Subdevice API */ namespace libcamera { LOG_DECLARE_CATEGORY(V4L2) namespace { /* * \struct V4L2SubdeviceFormatInfo * \brief Information about media bus formats * \param bitsPerPixel Bits per pixel * \param name Name of MBUS format */ struct V4L2SubdeviceFormatInfo { unsigned int bitsPerPixel; const char *name; }; /* * \var formatInfoMap * \brief A map that associates V4L2SubdeviceFormatInfo struct to V4L2 media * bus codes */ const std::map<uint32_t, V4L2SubdeviceFormatInfo> formatInfoMap = { { V4L2_MBUS_FMT_RGB444_2X8_PADHI_BE, { 16, "RGB444_2X8_PADHI_BE" } }, { V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE, { 16, "RGB444_2X8_PADHI_LE" } }, { V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE, { 16, "RGB555_2X8_PADHI_BE" } }, { V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE, { 16, "RGB555_2X8_PADHI_LE" } }, { V4L2_MBUS_FMT_BGR565_2X8_BE, { 16, "BGR565_2X8_BE" } }, { V4L2_MBUS_FMT_BGR565_2X8_LE, { 16, "BGR565_2X8_LE" } }, { V4L2_MBUS_FMT_RGB565_2X8_BE, { 16, "RGB565_2X8_BE" } }, { V4L2_MBUS_FMT_RGB565_2X8_LE, { 16, "RGB565_2X8_LE" } }, { V4L2_MBUS_FMT_RGB666_1X18, { 18, "RGB666_1X18" } }, { V4L2_MBUS_FMT_RGB888_1X24, { 24, "RGB888_1X24" } }, { V4L2_MBUS_FMT_RGB888_2X12_BE, { 24, "RGB888_2X12_BE" } }, { V4L2_MBUS_FMT_RGB888_2X12_LE, { 24, "RGB888_2X12_LE" } }, { V4L2_MBUS_FMT_ARGB8888_1X32, { 32, "ARGB8888_1X32" } }, { V4L2_MBUS_FMT_Y8_1X8, { 8, "Y8_1X8" } }, { V4L2_MBUS_FMT_UV8_1X8, { 8, "UV8_1X8" } }, { V4L2_MBUS_FMT_UYVY8_1_5X8, { 12, "UYVY8_1_5X8" } }, { V4L2_MBUS_FMT_VYUY8_1_5X8, { 12, "VYUY8_1_5X8" } }, { V4L2_MBUS_FMT_YUYV8_1_5X8, { 12, "YUYV8_1_5X8" } }, { V4L2_MBUS_FMT_YVYU8_1_5X8, { 12, "YVYU8_1_5X8" } }, { V4L2_MBUS_FMT_UYVY8_2X8, { 16, "UYVY8_2X8" } }, { V4L2_MBUS_FMT_VYUY8_2X8, { 16, "VYUY8_2X8" } }, { V4L2_MBUS_FMT_YUYV8_2X8, { 16, "YUYV8_2X8" } }, { V4L2_MBUS_FMT_YVYU8_2X8, { 16, "YVYU8_2X8" } }, { V4L2_MBUS_FMT_Y10_1X10, { 10, "Y10_1X10" } }, { V4L2_MBUS_FMT_UYVY10_2X10, { 20, "UYVY10_2X10" } }, { V4L2_MBUS_FMT_VYUY10_2X10, { 20, "VYUY10_2X10" } }, { V4L2_MBUS_FMT_YUYV10_2X10, { 20, "YUYV10_2X10" } }, { V4L2_MBUS_FMT_YVYU10_2X10, { 20, "YVYU10_2X10" } }, { V4L2_MBUS_FMT_Y12_1X12, { 12, "Y12_1X12" } }, { V4L2_MBUS_FMT_UYVY8_1X16, { 16, "UYVY8_1X16" } }, { V4L2_MBUS_FMT_VYUY8_1X16, { 16, "VYUY8_1X16" } }, { V4L2_MBUS_FMT_YUYV8_1X16, { 16, "YUYV8_1X16" } }, { V4L2_MBUS_FMT_YVYU8_1X16, { 16, "YVYU8_1X16" } }, { V4L2_MBUS_FMT_YDYUYDYV8_1X16, { 16, "YDYUYDYV8_1X16" } }, { V4L2_MBUS_FMT_UYVY10_1X20, { 20, "UYVY10_1X20" } }, { V4L2_MBUS_FMT_VYUY10_1X20, { 20, "VYUY10_1X20" } }, { V4L2_MBUS_FMT_YUYV10_1X20, { 20, "YUYV10_1X20" } }, { V4L2_MBUS_FMT_YVYU10_1X20, { 20, "YVYU10_1X20" } }, { V4L2_MBUS_FMT_YUV10_1X30, { 30, "YUV10_1X30" } }, { V4L2_MBUS_FMT_AYUV8_1X32, { 32, "AYUV8_1X32" } }, { V4L2_MBUS_FMT_UYVY12_2X12, { 24, "UYVY12_2X12" } }, { V4L2_MBUS_FMT_VYUY12_2X12, { 24, "VYUY12_2X12" } }, { V4L2_MBUS_FMT_YUYV12_2X12, { 24, "YUYV12_2X12" } }, { V4L2_MBUS_FMT_YVYU12_2X12, { 24, "YVYU12_2X12" } }, { V4L2_MBUS_FMT_UYVY12_1X24, { 24, "UYVY12_1X24" } }, { V4L2_MBUS_FMT_VYUY12_1X24, { 24, "VYUY12_1X24" } }, { V4L2_MBUS_FMT_YUYV12_1X24, { 24, "YUYV12_1X24" } }, { V4L2_MBUS_FMT_YVYU12_1X24, { 24, "YVYU12_1X24" } }, { V4L2_MBUS_FMT_SBGGR8_1X8, { 8, "SBGGR8_1X8" } }, { V4L2_MBUS_FMT_SGBRG8_1X8, { 8, "SGBRG8_1X8" } }, { V4L2_MBUS_FMT_SGRBG8_1X8, { 8, "SGRBG8_1X8" } }, { V4L2_MBUS_FMT_SRGGB8_1X8, { 8, "SRGGB8_1X8" } }, { V4L2_MBUS_FMT_SBGGR10_ALAW8_1X8, { 8, "SBGGR10_ALAW8_1X8" } }, { V4L2_MBUS_FMT_SGBRG10_ALAW8_1X8, { 8, "SGBRG10_ALAW8_1X8" } }, { V4L2_MBUS_FMT_SGRBG10_ALAW8_1X8, { 8, "SGRBG10_ALAW8_1X8" } }, { V4L2_MBUS_FMT_SRGGB10_ALAW8_1X8, { 8, "SRGGB10_ALAW8_1X8" } }, { V4L2_MBUS_FMT_SBGGR10_DPCM8_1X8, { 8, "SBGGR10_DPCM8_1X8" } }, { V4L2_MBUS_FMT_SGBRG10_DPCM8_1X8, { 8, "SGBRG10_DPCM8_1X8" } }, { V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8, { 8, "SGRBG10_DPCM8_1X8" } }, { V4L2_MBUS_FMT_SRGGB10_DPCM8_1X8, { 8, "SRGGB10_DPCM8_1X8" } }, { V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE, { 16, "SBGGR10_2X8_PADHI_BE" } }, { V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE, { 16, "SBGGR10_2X8_PADHI_LE" } }, { V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE, { 16, "SBGGR10_2X8_PADLO_BE" } }, { V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE, { 16, "SBGGR10_2X8_PADLO_LE" } }, { V4L2_MBUS_FMT_SBGGR10_1X10, { 10, "SBGGR10_1X10" } }, { V4L2_MBUS_FMT_SGBRG10_1X10, { 10, "SGBRG10_1X10" } }, { V4L2_MBUS_FMT_SGRBG10_1X10, { 10, "SGRBG10_1X10" } }, { V4L2_MBUS_FMT_SRGGB10_1X10, { 10, "SRGGB10_1X10" } }, { V4L2_MBUS_FMT_SBGGR12_1X12, { 12, "SBGGR12_1X12" } }, { V4L2_MBUS_FMT_SGBRG12_1X12, { 12, "SGBRG12_1X12" } }, { V4L2_MBUS_FMT_SGRBG12_1X12, { 12, "SGRBG12_1X12" } }, { V4L2_MBUS_FMT_SRGGB12_1X12, { 12, "SRGGB12_1X12" } }, { V4L2_MBUS_FMT_AHSV8888_1X32, { 32, "AHSV8888_1X32" } }, }; } /* namespace */ /** * \struct V4L2SubdeviceFormat * \brief The V4L2 sub-device image format and sizes * * This structure describes the format of images when transported between * separate components connected through a physical bus, such as image sensor * and image receiver or between components part of the same System-on-Chip that * realize an image transformation pipeline. * * The format of images when transported on physical interconnections is known * as the "media bus format", and it is identified by a resolution and a pixel * format identification code, known as the "media bus code", not to be confused * with the fourcc code that identify the format of images when stored in memory * (see V4L2VideoDevice::V4L2DeviceFormat). * * Media Bus formats supported by the V4L2 APIs are described in Section * 4.15.3.4.1 of the "Part I - Video for Linux API" chapter of the "Linux Media * Infrastructure userspace API", part of the Linux kernel documentation. * * Image media bus formats are properties of the subdev pads. When images are * transported between two media pads identified by a 0-indexed number, the * image bus format configured on the two pads should match (according to the * underlying driver format matching criteria) in order to prepare for a * successful streaming operation. For a more detailed description of the image * format negotiation process when performed between V4L2 subdevices, refer to * Section 4.15.3.1 of the above mentioned Linux kernel documentation section. */ /** * \var V4L2SubdeviceFormat::mbus_code * \brief The image format bus code */ /** * \var V4L2SubdeviceFormat::size * \brief The image size in pixels */ /** * \brief Assemble and return a string describing the format * \return A string describing the V4L2SubdeviceFormat */ const std::string V4L2SubdeviceFormat::toString() const { std::stringstream mbus; mbus << size.toString() << "-"; const auto it = formatInfoMap.find(mbus_code); if (it == formatInfoMap.end()) mbus << utils::hex(mbus_code, 4); else mbus << it->second.name; return mbus.str(); } /** * \brief Retrieve the number of bits per pixel for the V4L2 subdevice format * \return The number of bits per pixel for the format, or 0 if the format is * not supported */ uint8_t V4L2SubdeviceFormat::bitsPerPixel() const { const auto it = formatInfoMap.find(mbus_code); if (it == formatInfoMap.end()) { LOG(V4L2, Error) << "No information available for format '" << toString() << "'"; return 0; } return it->second.bitsPerPixel; } /** * \class V4L2Subdevice * \brief A V4L2 subdevice as exposed by the Linux kernel * * The V4L2Subdevice class provides an API to the "Sub-device interface" as * described in section 4.15 of the "Linux Media Infrastructure userspace API" * chapter of the Linux Kernel documentation. * * A V4L2Subdevice is constructed from a MediaEntity instance, using the system * path of the entity's device node. No API call other than open(), isOpen() * and close() shall be called on an unopened device instance. Upon destruction * any device left open will be closed, and any resources released. */ /** * \typedef V4L2Subdevice::Formats * \brief A map of supported media bus formats to frame sizes */ /** * \enum V4L2Subdevice::Whence * \brief Specify the type of format for getFormat() and setFormat() operations * \var V4L2Subdevice::ActiveFormat * \brief The format operation applies to ACTIVE formats * \var V4L2Subdevice::TryFormat * \brief The format operation applies to TRY formats */ /** * \brief Create a V4L2 subdevice from a MediaEntity using its device node * path */ V4L2Subdevice::V4L2Subdevice(const MediaEntity *entity) : V4L2Device(entity->deviceNode()), entity_(entity) { } V4L2Subdevice::~V4L2Subdevice() { close(); } /** * \brief Open a V4L2 subdevice * \return 0 on success or a negative error code otherwise */ int V4L2Subdevice::open() { return V4L2Device::open(O_RDWR); } /** * \fn V4L2Subdevice::entity() * \brief Retrieve the media entity associated with the subdevice * \return The subdevice's associated media entity. */ /** * \brief Get selection rectangle \a rect for \a target * \param[in] pad The 0-indexed pad number the rectangle is retrieved from * \param[in] target The selection target defined by the V4L2_SEL_TGT_* flags * \param[out] rect The retrieved selection rectangle * * \todo Define a V4L2SelectionTarget enum for the selection target * * \return 0 on success or a negative error code otherwise */ int V4L2Subdevice::getSelection(unsigned int pad, unsigned int target, Rectangle *rect) { struct v4l2_subdev_selection sel = {}; sel.which = V4L2_SUBDEV_FORMAT_ACTIVE; sel.pad = pad; sel.target = target; sel.flags = 0; int ret = ioctl(VIDIOC_SUBDEV_G_SELECTION, &sel); if (ret < 0) { LOG(V4L2, Error) << "Unable to get rectangle " << target << " on pad " << pad << ": " << strerror(-ret); return ret; } rect->x = sel.r.left; rect->y = sel.r.top; rect->width = sel.r.width; rect->height = sel.r.height; return 0; } /** * \brief Set selection rectangle \a rect for \a target * \param[in] pad The 0-indexed pad number the rectangle is to be applied to * \param[in] target The selection target defined by the V4L2_SEL_TGT_* flags * \param[inout] rect The selection rectangle to be applied * * \todo Define a V4L2SelectionTarget enum for the selection target * * \return 0 on success or a negative error code otherwise */ int V4L2Subdevice::setSelection(unsigned int pad, unsigned int target, Rectangle *rect) { struct v4l2_subdev_selection sel = {}; sel.which = V4L2_SUBDEV_FORMAT_ACTIVE; sel.pad = pad; sel.target = target; sel.flags = 0; sel.r.left = rect->x; sel.r.top = rect->y; sel.r.width = rect->width; sel.r.height = rect->height; int ret = ioctl(VIDIOC_SUBDEV_S_SELECTION, &sel); if (ret < 0) { LOG(V4L2, Error) << "Unable to set rectangle " << target << " on pad " << pad << ": " << strerror(-ret); return ret; } rect->x = sel.r.left; rect->y = sel.r.top; rect->width = sel.r.width; rect->height = sel.r.height; return 0; } /** * \brief Enumerate all media bus codes and frame sizes on a \a pad * \param[in] pad The 0-indexed pad number to enumerate formats on * * Enumerate all media bus codes and frame sizes supported by the subdevice on * a \a pad. * * \return A list of the supported device formats */ V4L2Subdevice::Formats V4L2Subdevice::formats(unsigned int pad) { Formats formats; if (pad >= entity_->pads().size()) { LOG(V4L2, Error) << "Invalid pad: " << pad; return {}; } for (unsigned int code : enumPadCodes(pad)) { std::vector<SizeRange> sizes = enumPadSizes(pad, code); if (sizes.empty()) return {}; const auto inserted = formats.insert({ code, sizes }); if (!inserted.second) { LOG(V4L2, Error) << "Could not add sizes for media bus code " << code << " on pad " << pad; return {}; } } return formats; } /** * \brief Retrieve the image format set on one of the V4L2 subdevice pads * \param[in] pad The 0-indexed pad number the format is to be retrieved from * \param[out] format The image bus format * \param[in] whence The format to get, \ref V4L2Subdevice::ActiveFormat * "ActiveFormat" or \ref V4L2Subdevice::TryFormat "TryFormat" * \return 0 on success or a negative error code otherwise */ int V4L2Subdevice::getFormat(unsigned int pad, V4L2SubdeviceFormat *format, Whence whence) { struct v4l2_subdev_format subdevFmt = {}; subdevFmt.which = whence == ActiveFormat ? V4L2_SUBDEV_FORMAT_ACTIVE : V4L2_SUBDEV_FORMAT_TRY; subdevFmt.pad = pad; int ret = ioctl(VIDIOC_SUBDEV_G_FMT, &subdevFmt); if (ret) { LOG(V4L2, Error) << "Unable to get format on pad " << pad << ": " << strerror(-ret); return ret; } format->size.width = subdevFmt.format.width; format->size.height = subdevFmt.format.height; format->mbus_code = subdevFmt.format.code; return 0; } /** * \brief Set an image format on one of the V4L2 subdevice pads * \param[in] pad The 0-indexed pad number the format is to be applied to * \param[inout] format The image bus format to apply to the subdevice's pad * \param[in] whence The format to set, \ref V4L2Subdevice::ActiveFormat * "ActiveFormat" or \ref V4L2Subdevice::TryFormat "TryFormat" * * Apply the requested image format to the desired media pad and return the * actually applied format parameters, as getFormat() would do. * * \return 0 on success or a negative error code otherwise */ int V4L2Subdevice::setFormat(unsigned int pad, V4L2SubdeviceFormat *format, Whence whence) { struct v4l2_subdev_format subdevFmt = {}; subdevFmt.which = whence == ActiveFormat ? V4L2_SUBDEV_FORMAT_ACTIVE : V4L2_SUBDEV_FORMAT_TRY; subdevFmt.pad = pad; subdevFmt.format.width = format->size.width; subdevFmt.format.height = format->size.height; subdevFmt.format.code = format->mbus_code; int ret = ioctl(VIDIOC_SUBDEV_S_FMT, &subdevFmt); if (ret) { LOG(V4L2, Error) << "Unable to set format on pad " << pad << ": " << strerror(-ret); return ret; } format->size.width = subdevFmt.format.width; format->size.height = subdevFmt.format.height; format->mbus_code = subdevFmt.format.code; return 0; } /** * \brief Create a new video subdevice instance from \a entity in media device * \a media * \param[in] media The media device where the entity is registered * \param[in] entity The media entity name * * Releasing memory of the newly created instance is responsibility of the * caller of this function. * * \return A newly created V4L2Subdevice on success, nullptr otherwise */ V4L2Subdevice *V4L2Subdevice::fromEntityName(const MediaDevice *media, const std::string &entity) { MediaEntity *mediaEntity = media->getEntityByName(entity); if (!mediaEntity) return nullptr; return new V4L2Subdevice(mediaEntity); } std::string V4L2Subdevice::logPrefix() const { return "'" + entity_->name() + "'"; } std::vector<unsigned int> V4L2Subdevice::enumPadCodes(unsigned int pad) { std::vector<unsigned int> codes; int ret; for (unsigned int index = 0; ; index++) { struct v4l2_subdev_mbus_code_enum mbusEnum = {}; mbusEnum.pad = pad; mbusEnum.index = index; mbusEnum.which = V4L2_SUBDEV_FORMAT_ACTIVE; ret = ioctl(VIDIOC_SUBDEV_ENUM_MBUS_CODE, &mbusEnum); if (ret) break; codes.push_back(mbusEnum.code); } if (ret < 0 && ret != -EINVAL) { LOG(V4L2, Error) << "Unable to enumerate formats on pad " << pad << ": " << strerror(-ret); return {}; } return codes; } std::vector<SizeRange> V4L2Subdevice::enumPadSizes(unsigned int pad, unsigned int code) { std::vector<SizeRange> sizes; int ret; for (unsigned int index = 0;; index++) { struct v4l2_subdev_frame_size_enum sizeEnum = {}; sizeEnum.index = index; sizeEnum.pad = pad; sizeEnum.code = code; sizeEnum.which = V4L2_SUBDEV_FORMAT_ACTIVE; ret = ioctl(VIDIOC_SUBDEV_ENUM_FRAME_SIZE, &sizeEnum); if (ret) break; sizes.emplace_back(Size{ sizeEnum.min_width, sizeEnum.min_height }, Size{ sizeEnum.max_width, sizeEnum.max_height }); } if (ret < 0 && ret != -EINVAL && ret != -ENOTTY) { LOG(V4L2, Error) << "Unable to enumerate sizes on pad " << pad << ": " << strerror(-ret); return {}; } return sizes; } } /* namespace libcamera */


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