update for linux.

Analyser/Application.cpp

@@ -20,9 +20,7 @@
 #include <filesystem>
 #include <fstream>
 #include <mbedtls/md5.h>
-#ifdef WIN32
 #include "DeviceDiscovery.h"
-#endif
 
 constexpr uint32_t ImageSliceSize = (4000 - 32);
 
@@ -123,13 +121,11 @@ QStringList Application::availableSerialPorts() const {
 
 QStringList Application::availableUsbVideoCameras() const {
     QStringList ret;
-#ifdef WIN32
     DeviceDiscovery d;
     auto devices = d.devices();
     for (auto &device : devices) {
         ret << QString::fromStdString(device);
     }
-#endif
     return ret;
 }
 

Peripheral/CMakeLists.txt

@@ -4,7 +4,7 @@ find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS SerialPort)
 set(CMAKE_AUTOMOC ON)
 
 add_library(Peripheral
-    $<$<PLATFORM_ID:Windows>:DeviceDiscovery.h DeviceDiscovery.cpp>
+    DeviceDiscovery.h DeviceDiscovery.cpp
     CdcUpdater.h CdcUpdater.cpp
 )
 

Peripheral/DeviceDiscovery.cpp

@@ -3,14 +3,25 @@
 #include "StringUtility.h"
 #include <boost/scope/scope_exit.hpp>
 #include <cstdlib>
+#include <filesystem>
+#ifdef Q_OS_WIN
 #include <mfapi.h>
 #include <mfcaptureengine.h>
+#include <mfidl.h>
+#include <mfreadwrite.h>
+#else
+#include <fcntl.h>
+#include <linux/videodev2.h>
+#include <sys/ioctl.h>
+#endif
 
 struct DeviceDiscovery::Device {
-    Device(IMFMediaSource *source);
     ~Device();
+#ifdef Q_OS_WIN
+    Device(IMFMediaSource *source);
     IMFMediaSource *source = nullptr;
     IMFSourceReader *reader = nullptr;
+#endif
 };
 
 template <class T>
@@ -24,6 +35,7 @@ void SafeRelease(T **ppT) {
 DeviceDiscovery::DeviceDiscovery() {
 }
 
+#ifdef Q_OS_WIN
 static std::string deviceName(IMFActivate *device) {
     std::string ret;
     WCHAR *friendlyName = nullptr;
@@ -186,12 +198,36 @@ DeviceDiscovery::Device::Device(IMFMediaSource *source) : source(source) {
         LOG(error) << "MFCreateSourceReaderFromMediaSource() failed, result: " << result;
     }
 }
+#else
+std::vector<std::string> DeviceDiscovery::devices() {
+    std::vector<std::string> ret;
+    for (const auto &entry : std::filesystem::directory_iterator("/dev")) {
+        if (entry.is_character_file() && entry.path().string().find("video") != std::string::npos) {
+            int fd = open(entry.path().c_str(), O_RDWR);
+            if (fd < 0) {
+                continue;
+            }
+
+            struct v4l2_capability cap;
+            if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == 0) {
+                if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
+                    ret.push_back(entry.path().string());
+                }
+            }
+            close(fd);
+        }
+    }
+    return ret;
+}
+#endif
 
 DeviceDiscovery::Device::~Device() {
+#ifdef Q_OS_WIN
     if (source != nullptr) {
         source->Release();
     }
     if (reader != nullptr) {
         reader->Release();
     }
+#endif
 }

Peripheral/DeviceDiscovery.h

@@ -2,8 +2,6 @@
 #define __DEVICEDISCOVERY_H__
 
 #include <memory>
-#include <mfidl.h>
-#include <mfreadwrite.h>
 #include <string>
 #include <system_error>
 #include <vector>