feat: add Glog APIs for debugging

Assets/MediaPipe/SDK/Scripts/External/Glog.cs

@@ -1,11 +1,43 @@
 namespace Mediapipe {
   public class Glog {
+    public enum Severity : int {
+      INFO = 0,
+      WARNING = 1,
+      ERROR = 2,
+      FATAL = 3,
+    }
+
     public static void Initialize(string name, string dir) {
       UnsafeNativeMethods.google_InitGoogleLogging__PKc(name, dir).Assert();
     }
 
     public static void Shutdown() {
       UnsafeNativeMethods.google_ShutdownGoogleLogging().Assert();
     }
+
+    public static void Log(Severity severity, string str) {
+      switch (severity) {
+        case Severity.INFO: {
+          UnsafeNativeMethods.glog_LOG_INFO__PKc(str);
+          break;
+        }
+        case Severity.WARNING: {
+          UnsafeNativeMethods.glog_LOG_WARNING__PKc(str);
+          break;
+        }
+        case Severity.ERROR: {
+          UnsafeNativeMethods.glog_LOG_ERROR__PKc(str);
+          break;
+        }
+        case Severity.FATAL: {
+          UnsafeNativeMethods.glog_LOG_FATAL__PKc(str);
+          break;
+        }
+      }
+    }
+
+    public static void FlushLogFiles(Severity severity = Severity.INFO) {
+      UnsafeNativeMethods.google_FlushLogFiles(severity);
+    }
   }
 }

Assets/MediaPipe/SDK/Scripts/PInvoke/NativeMethods/External/Glog_Unsafe.cs

@@ -7,5 +7,20 @@ internal static partial class UnsafeNativeMethods {
 
     [DllImport (MediaPipeLibrary, ExactSpelling = true)]
     public static extern MpReturnCode google_ShutdownGoogleLogging();
+
+    [DllImport (MediaPipeLibrary, ExactSpelling = true)]
+    public static extern MpReturnCode glog_LOG_INFO__PKc(string str);
+
+    [DllImport (MediaPipeLibrary, ExactSpelling = true)]
+    public static extern MpReturnCode glog_LOG_WARNING__PKc(string str);
+
+    [DllImport (MediaPipeLibrary, ExactSpelling = true)]
+    public static extern MpReturnCode glog_LOG_ERROR__PKc(string str);
+
+    [DllImport (MediaPipeLibrary, ExactSpelling = true)]
+    public static extern MpReturnCode glog_LOG_FATAL__PKc(string str);
+
+    [DllImport (MediaPipeLibrary, ExactSpelling = true)]
+    public static extern MpReturnCode google_FlushLogFiles(Glog.Severity severity);
   }
 }

C/mediapipe_api/BUILD

@@ -5,6 +5,7 @@ cc_library(
     name = "mediapipe_c",
     deps = [
         ":calculators",
+        "//mediapipe_api/external:glog",
         "//mediapipe_api/external:protobuf",
         "//mediapipe_api/external:stdlib",
         "//mediapipe_api/framework:calculator",

C/mediapipe_api/external/BUILD

@@ -1,3 +1,14 @@
+cc_library(
+    name = "glog",
+    srcs = ["glog.cc"],
+    hdrs = ["glog.h"],
+    deps = [
+        "//mediapipe_api:common",
+    ],
+    visibility = ["//visibility:public"],
+    alwayslink = True,
+)
+
 cc_library(
     name = "protobuf",
     srcs = ["protobuf.cc"],

C/mediapipe_api/external/glog.cc

@@ -0,0 +1,21 @@
+#include "mediapipe_api/external/glog.h"
+
+void glog_LOG_INFO__PKc(const char* str) {
+  LOG(INFO) << str;
+}
+
+void glog_LOG_WARNING__PKc(const char* str) {
+  LOG(WARNING) << str;
+}
+
+void glog_LOG_ERROR__PKc(const char* str) {
+  LOG(ERROR) << str;
+}
+
+void glog_LOG_FATAL__PKc(const char* str) {
+  LOG(FATAL) << str;
+}
+
+void google_FlushLogFiles(google::LogSeverity severity) {
+  google::FlushLogFiles(severity);
+}

C/mediapipe_api/external/glog.h

@@ -0,0 +1,18 @@
+#ifndef C_MEDIAPIPE_API_EXTERNAL_GLOG_H_
+#define C_MEDIAPIPE_API_EXTERNAL_GLOG_H_
+
+#include <string>
+#include "mediapipe_api/common.h"
+
+extern "C" {
+
+MP_CAPI(void) glog_LOG_INFO__PKc(const char* str);
+MP_CAPI(void) glog_LOG_WARNING__PKc(const char* str);
+MP_CAPI(void) glog_LOG_ERROR__PKc(const char* str);
+MP_CAPI(void) glog_LOG_FATAL__PKc(const char* str);
+
+MP_CAPI(void) google_FlushLogFiles(google::LogSeverity severity);
+
+}  // extern "C"
+
+#endif  // C_MEDIAPIPE_API_EXTERNAL_GLOG_H_