Use assign

Author: larryliu0820

extension/llm/runner/wav_loader.h

@@ -186,29 +186,27 @@ inline std::vector<float> load_wav_audio_data(const std::string& fp) {
 
   if (bits_per_sample == 32) {
     size_t num_samples = data_size / 4;
-    audio_data.resize(num_samples);
 
     if (audio_format == kWavFormatIeeeFloat) {
       // IEEE float format - read directly as floats
       const float* input_buffer =
           reinterpret_cast<const float*>(data + data_offset);
-      for (size_t i = 0; i < num_samples; ++i) {
-        audio_data[i] = input_buffer[i];
-      }
+      audio_data.assign(input_buffer, input_buffer + num_samples);
     } else {
       // PCM integer format - normalize from int32
       const int32_t* input_buffer =
           reinterpret_cast<const int32_t*>(data + data_offset);
+      audio_data.resize(num_samples);
       for (size_t i = 0; i < num_samples; ++i) {
         audio_data[i] = static_cast<float>(
             static_cast<double>(input_buffer[i]) * kOneOverIntMax);
       }
     }
   } else if (bits_per_sample == 16) {
     size_t num_samples = data_size / 2;
-    audio_data.resize(num_samples);
     const int16_t* input_buffer =
         reinterpret_cast<const int16_t*>(data + data_offset);
+    audio_data.resize(num_samples);
 
     for (size_t i = 0; i < num_samples; ++i) {
       audio_data[i] = static_cast<float>(