fix windown unicode model path

src/whisper-processing.cpp

@@ -8,6 +8,8 @@
 
 #include <algorithm>
 #include <cctype>
+#include <fstream>
+#include <Windows.h>
 
 #define VAD_THOLD 0.0001f
 #define FREQ_THOLD 100.0f
@@ -73,7 +75,32 @@ bool vad_simple(float *pcmf32, size_t pcm32f_size, uint32_t sample_rate, float v
 struct whisper_context *init_whisper_context(const std::string &model_path)
 {
 	obs_log(LOG_INFO, "Loading whisper model from %s", model_path.c_str());
+
+#ifdef _WIN32
+    // convert model path UTF8 to wstring (wchar_t) for whisper
+    int count = MultiByteToWideChar(CP_UTF8, 0, model_path.c_str(), (int)model_path.length(), NULL, 0);
+    std::wstring model_path_ws(count, 0);
+    MultiByteToWideChar(CP_UTF8, 0, model_path.c_str(), (int)model_path.length(), &model_path_ws[0], count);
+
+    // Read model into buffer
+    std::ifstream modelFile(model_path_ws, std::ios::binary);
+    if (!modelFile.is_open()) {
+        obs_log(LOG_ERROR, "Failed to open whisper model file %s", model_path.c_str());
+        return nullptr;
+    }
+    modelFile.seekg(0, std::ios::end);
+    const size_t modelFileSize = modelFile.tellg();
+    modelFile.seekg(0, std::ios::beg);
+    std::vector<char> modelBuffer(modelFileSize);
+    modelFile.read(modelBuffer.data(), modelFileSize);
+    modelFile.close();
+
+    // Initialize whisper
+	struct whisper_context *ctx = whisper_init_from_buffer(modelBuffer.data(), modelFileSize);
+#else
 	struct whisper_context *ctx = whisper_init_from_file(model_path.c_str());
+#endif
+
 	if (ctx == nullptr) {
 		obs_log(LOG_ERROR, "Failed to load whisper model");
 		return nullptr;