Add support for USB Webcams on Windows (#1390)

cscore/src/main/native/windows/UsbCameraProperty.cpp

@@ -0,0 +1,69 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "UsbCameraProperty.h"
+
+using namespace cs;
+
+UsbCameraProperty::UsbCameraProperty(const wpi::Twine& name_,
+                                     tagVideoProcAmpProperty tag, bool autoProp,
+                                     IAMVideoProcAmp* pProcAmp, bool* isValid)
+    : PropertyImpl{autoProp ? name_ + "_auto" : name_} {
+  this->tag = tag;
+  this->isAutoProp = autoProp;
+  long paramVal, paramFlag;  // NOLINT(runtime/int)
+  HRESULT hr;
+  long minVal, maxVal, stepVal;  // NOLINT(runtime/int)
+  hr = pProcAmp->GetRange(tag, &minVal, &maxVal, &stepVal, &paramVal,
+                          &paramFlag);  // Unable to get the property, trying to
+                                        // return default value
+  if (SUCCEEDED(hr)) {
+    minimum = minVal;
+    maximum = maxVal;
+    hasMaximum = true;
+    hasMinimum = true;
+    defaultValue = paramVal;
+    step = stepVal;
+    value = paramVal;
+    propKind = CS_PropertyKind::CS_PROP_INTEGER;
+    *isValid = true;
+  } else {
+    *isValid = false;
+  }
+}
+
+bool UsbCameraProperty::DeviceGet(std::unique_lock<wpi::mutex>& lock,
+                                  IAMVideoProcAmp* pProcAmp) {
+  if (!pProcAmp) return true;
+
+  lock.unlock();
+  long newValue = 0, paramFlag = 0;  // NOLINT(runtime/int)
+  if (SUCCEEDED(pProcAmp->Get(tag, &newValue, &paramFlag))) {
+    lock.lock();
+    value = newValue;
+    return true;
+  }
+
+  return false;
+}
+bool UsbCameraProperty::DeviceSet(std::unique_lock<wpi::mutex>& lock,
+                                  IAMVideoProcAmp* pProcAmp) const {
+  return DeviceSet(lock, pProcAmp, value);
+}
+bool UsbCameraProperty::DeviceSet(std::unique_lock<wpi::mutex>& lock,
+                                  IAMVideoProcAmp* pProcAmp,
+                                  int newValue) const {
+  if (!pProcAmp) return true;
+
+  lock.unlock();
+  if (SUCCEEDED(pProcAmp->Set(tag, newValue, VideoProcAmp_Flags_Manual))) {
+    lock.lock();
+    return true;
+  }
+
+  return false;
+}