Add Flush to VAD so that the last segment can be detected. (#1099)

flutter/sherpa_onnx/lib/src/sherpa_onnx_bindings.dart

@@ -491,6 +491,12 @@ typedef SherpaOnnxVoiceActivityDetectorResetNative = Void Function(
 typedef SherpaOnnxVoiceActivityDetectorReset = void Function(
     Pointer<SherpaOnnxVoiceActivityDetector>);
 
+typedef SherpaOnnxVoiceActivityDetectorFlushNative = Void Function(
+    Pointer<SherpaOnnxVoiceActivityDetector>);
+
+typedef SherpaOnnxVoiceActivityDetectorFlush = void Function(
+    Pointer<SherpaOnnxVoiceActivityDetector>);
+
 typedef SherpaOnnxVoiceActivityDetectorFrontNative
     = Pointer<SherpaOnnxSpeechSegment> Function(
         Pointer<SherpaOnnxVoiceActivityDetector>);
@@ -779,6 +785,8 @@ class SherpaOnnxBindings {
 
   static SherpaOnnxVoiceActivityDetectorReset? voiceActivityDetectorReset;
 
+  static SherpaOnnxVoiceActivityDetectorFlush? voiceActivityDetectorFlush;
+
   static SherpaOnnxCreateCircularBuffer? createCircularBuffer;
 
   static SherpaOnnxDestroyCircularBuffer? destroyCircularBuffer;
@@ -1036,6 +1044,11 @@ class SherpaOnnxBindings {
             'SherpaOnnxVoiceActivityDetectorReset')
         .asFunction();
 
+    voiceActivityDetectorFlush ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxVoiceActivityDetectorFlushNative>>(
+            'SherpaOnnxVoiceActivityDetectorFlush')
+        .asFunction();
+
     createCircularBuffer ??= dynamicLibrary
         .lookup<NativeFunction<SherpaOnnxCreateCircularBufferNative>>(
             'SherpaOnnxCreateCircularBuffer')

flutter/sherpa_onnx/lib/src/vad.dart

@@ -207,6 +207,10 @@ class VoiceActivityDetector {
     SherpaOnnxBindings.voiceActivityDetectorReset?.call(ptr);
   }
 
+  void flush() {
+    SherpaOnnxBindings.voiceActivityDetectorFlush?.call(ptr);
+  }
+
   Pointer<SherpaOnnxVoiceActivityDetector> ptr;
   final VadModelConfig config;
 }