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https://github.com/wpilibsuite/allwpilib
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Refactor UsbCameraProperty.
This commit is contained in:
Peter Johnson
277
src/UsbCameraProperty.cpp
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277
src/UsbCameraProperty.cpp
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/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2016. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#include "UsbCameraProperty.h"
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#include "llvm/SmallString.h"
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#include "UsbUtil.h"
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using namespace cs;
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#ifdef __linux__
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static int GetIntCtrlIoctl(int fd, unsigned id, int type, int64_t* value) {
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unsigned ctrl_class = V4L2_CTRL_ID2CLASS(id);
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if (type == V4L2_CTRL_TYPE_INTEGER64 || V4L2_CTRL_DRIVER_PRIV(id) ||
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(ctrl_class != V4L2_CTRL_CLASS_USER &&
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ctrl_class != V4L2_CID_PRIVATE_BASE)) {
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// Use extended control
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struct v4l2_ext_control ctrl;
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struct v4l2_ext_controls ctrls;
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std::memset(&ctrl, 0, sizeof(ctrl));
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std::memset(&ctrls, 0, sizeof(ctrls));
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ctrl.id = id;
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ctrls.ctrl_class = ctrl_class;
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ctrls.count = 1;
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ctrls.controls = &ctrl;
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int rc = DoIoctl(fd, VIDIOC_G_EXT_CTRLS, &ctrls);
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if (rc < 0) return rc;
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*value = ctrl.value;
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} else {
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// Use normal control
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struct v4l2_control ctrl;
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std::memset(&ctrl, 0, sizeof(ctrl));
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ctrl.id = id;
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int rc = DoIoctl(fd, VIDIOC_G_CTRL, &ctrl);
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if (rc < 0) return rc;
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*value = ctrl.value;
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}
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return 0;
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}
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static int SetIntCtrlIoctl(int fd, unsigned id, int type, int64_t value) {
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unsigned ctrl_class = V4L2_CTRL_ID2CLASS(id);
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if (type == V4L2_CTRL_TYPE_INTEGER64 || V4L2_CTRL_DRIVER_PRIV(id) ||
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(ctrl_class != V4L2_CTRL_CLASS_USER &&
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ctrl_class != V4L2_CID_PRIVATE_BASE)) {
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// Use extended control
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struct v4l2_ext_control ctrl;
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struct v4l2_ext_controls ctrls;
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std::memset(&ctrl, 0, sizeof(ctrl));
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std::memset(&ctrls, 0, sizeof(ctrls));
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ctrl.id = id;
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if (type == V4L2_CTRL_TYPE_INTEGER64)
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ctrl.value64 = value;
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else
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ctrl.value = static_cast<__s32>(value);
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ctrls.ctrl_class = ctrl_class;
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ctrls.count = 1;
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ctrls.controls = &ctrl;
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return DoIoctl(fd, VIDIOC_S_EXT_CTRLS, &ctrls);
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} else {
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// Use normal control
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struct v4l2_control ctrl;
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ctrl.id = id;
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ctrl.value = static_cast<__s32>(value);
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return DoIoctl(fd, VIDIOC_S_CTRL, &ctrl);
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}
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}
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static int GetStringCtrlIoctl(int fd, int id, int maximum,
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std::string* value) {
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struct v4l2_ext_control ctrl;
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struct v4l2_ext_controls ctrls;
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std::memset(&ctrl, 0, sizeof(ctrl));
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std::memset(&ctrls, 0, sizeof(ctrls));
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ctrl.id = id;
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ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(id);
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ctrls.count = 1;
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ctrls.controls = &ctrl;
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int rc = DoIoctl(fd, VIDIOC_G_EXT_CTRLS, &ctrls);
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if (rc < 0) {
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value->clear();
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return rc;
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}
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value->assign(ctrl.string, std::strlen(ctrl.string));
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return 0;
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}
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static int SetStringCtrlIoctl(int fd, int id, int maximum,
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llvm::StringRef value) {
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llvm::SmallString<64> str{value.substr(
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0, std::min(value.size(), static_cast<std::size_t>(maximum)))};
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struct v4l2_ext_control ctrl;
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struct v4l2_ext_controls ctrls;
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std::memset(&ctrl, 0, sizeof(ctrl));
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std::memset(&ctrls, 0, sizeof(ctrls));
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ctrl.id = id;
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ctrl.size = str.size();
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ctrl.string = const_cast<char*>(str.c_str());
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ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(id);
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ctrls.count = 1;
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ctrls.controls = &ctrl;
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return DoIoctl(fd, VIDIOC_S_EXT_CTRLS, &ctrls);
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}
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// Removes non-alphanumeric characters and replaces spaces with underscores.
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// e.g. "Zoom, Absolute" -> "zoom_absolute", "Pan (Absolute)" -> "pan_absolute"
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static llvm::StringRef NormalizeName(llvm::StringRef name,
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llvm::SmallVectorImpl<char>& buf) {
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bool newWord = false;
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for (auto ch : name) {
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if (std::isalnum(ch)) {
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if (newWord) buf.push_back('_');
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newWord = false;
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buf.push_back(std::tolower(ch));
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} else if (!buf.empty())
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newWord = true;
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}
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return llvm::StringRef(buf.data(), buf.size());
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}
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#ifdef VIDIOC_QUERY_EXT_CTRL
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UsbCameraProperty::UsbCameraProperty(const struct v4l2_query_ext_ctrl& ctrl)
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: PropertyImpl(llvm::StringRef{}, CS_PROP_NONE, ctrl.step,
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ctrl.default_value, 0),
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id(ctrl.id & V4L2_CTRL_ID_MASK),
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type(ctrl.type) {
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hasMinimum = true;
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minimum = ctrl.minimum;
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hasMaximum = true;
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maximum = ctrl.maximum;
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// propKind
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switch (ctrl.type) {
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case V4L2_CTRL_TYPE_INTEGER:
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case V4L2_CTRL_TYPE_INTEGER64:
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propKind = CS_PROP_INTEGER;
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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propKind = CS_PROP_BOOLEAN;
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break;
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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case V4L2_CTRL_TYPE_MENU:
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propKind = CS_PROP_ENUM;
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break;
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case V4L2_CTRL_TYPE_STRING:
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propKind = CS_PROP_STRING;
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break;
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default:
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return; // others unsupported
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}
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// name
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std::size_t len = 0;
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while (len < sizeof(ctrl.name) && ctrl.name[len] != '\0') ++len;
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llvm::SmallString<64> name_buf;
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name = NormalizeName(llvm::StringRef(ctrl.name, len), name_buf);
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}
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#endif
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UsbCameraProperty::UsbCameraProperty(const struct v4l2_queryctrl& ctrl)
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: PropertyImpl(llvm::StringRef{}, CS_PROP_NONE, ctrl.step,
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ctrl.default_value, 0),
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id(ctrl.id & V4L2_CTRL_ID_MASK),
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type(ctrl.type) {
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hasMinimum = true;
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minimum = ctrl.minimum;
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hasMaximum = true;
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maximum = ctrl.maximum;
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// propKind
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switch (ctrl.type) {
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case V4L2_CTRL_TYPE_INTEGER:
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case V4L2_CTRL_TYPE_INTEGER64:
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propKind = CS_PROP_INTEGER;
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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propKind = CS_PROP_BOOLEAN;
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break;
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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case V4L2_CTRL_TYPE_MENU:
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propKind = CS_PROP_ENUM;
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break;
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case V4L2_CTRL_TYPE_STRING:
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propKind = CS_PROP_STRING;
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break;
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default:
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return; // others unsupported
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}
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// name
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std::size_t len = 0;
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while (len < sizeof(ctrl.name) && ctrl.name[len] != '\0') ++len;
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llvm::SmallString<64> name_buf;
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name = NormalizeName(
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llvm::StringRef(reinterpret_cast<const char*>(ctrl.name), len), name_buf);
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}
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bool UsbCameraProperty::DeviceGet(std::unique_lock<std::mutex>& lock, int fd) {
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if (fd < 0) return true;
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unsigned idCopy = id;
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int rv = 0;
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switch (propKind) {
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case CS_PROP_BOOLEAN:
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case CS_PROP_INTEGER:
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case CS_PROP_ENUM: {
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int typeCopy = type;
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int64_t newValue = 0;
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lock.unlock();
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rv = GetIntCtrlIoctl(fd, idCopy, typeCopy, &newValue);
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lock.lock();
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if (rv >= 0) value = newValue;
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break;
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}
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case CS_PROP_STRING: {
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int maximumCopy = maximum;
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std::string newValueStr;
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lock.unlock();
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rv = GetStringCtrlIoctl(fd, idCopy, maximumCopy, &newValueStr);
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lock.lock();
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if (rv >= 0) valueStr = std::move(newValueStr);
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break;
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}
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default:
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break;
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}
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return rv >= 0;
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}
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bool UsbCameraProperty::DeviceSet(std::unique_lock<std::mutex>& lock,
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int fd) const {
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// Make a copy of the string as we're about to release the lock
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llvm::SmallString<128> valueStrCopy{valueStr};
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return DeviceSet(lock, fd, value, valueStrCopy);
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}
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bool UsbCameraProperty::DeviceSet(std::unique_lock<std::mutex>& lock, int fd,
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int newValue,
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llvm::StringRef newValueStr) const {
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if (fd < 0) return true;
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unsigned idCopy = id;
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int rv = 0;
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switch (propKind) {
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case CS_PROP_BOOLEAN:
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case CS_PROP_INTEGER:
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case CS_PROP_ENUM: {
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int typeCopy = type;
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lock.unlock();
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rv = SetIntCtrlIoctl(fd, idCopy, typeCopy, newValue);
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lock.lock();
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break;
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}
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case CS_PROP_STRING: {
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int maximumCopy = maximum;
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lock.unlock();
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rv = SetStringCtrlIoctl(fd, idCopy, maximumCopy, newValueStr);
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lock.lock();
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break;
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}
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default:
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break;
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}
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return rv >= 0;
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}
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#endif // __linux__
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