Add vad clear api for better performance (#366)

* Add vad clear api for better performance

* rename to make naming consistent and remove macro

* Fix linker error

* Fix Vad.kt

sherpa-onnx/c-api/c-api.cc

@@ -493,12 +493,17 @@ int32_t SherpaOnnxVoiceActivityDetectorDetected(
   return p->impl->IsSpeechDetected();
 }
 
-SHERPA_ONNX_API void SherpaOnnxVoiceActivityDetectorPop(
+void SherpaOnnxVoiceActivityDetectorPop(
     SherpaOnnxVoiceActivityDetector *p) {
   p->impl->Pop();
 }
 
-SHERPA_ONNX_API const SherpaOnnxSpeechSegment *
+void SherpaOnnxVoiceActivityDetectorClear(
+    SherpaOnnxVoiceActivityDetector *p) {
+  p->impl->Clear();
+}
+
+const SherpaOnnxSpeechSegment *
 SherpaOnnxVoiceActivityDetectorFront(SherpaOnnxVoiceActivityDetector *p) {
   const sherpa_onnx::SpeechSegment &segment = p->impl->Front();
 

sherpa-onnx/c-api/c-api.h

@@ -580,6 +580,10 @@ SherpaOnnxVoiceActivityDetectorDetected(SherpaOnnxVoiceActivityDetector *p);
 SHERPA_ONNX_API void SherpaOnnxVoiceActivityDetectorPop(
     SherpaOnnxVoiceActivityDetector *p);
 
+// Clear current speech segments.
+SHERPA_ONNX_API void SherpaOnnxVoiceActivityDetectorClear(
+    SherpaOnnxVoiceActivityDetector *p);
+
 // Return the first speech segment.
 // The user has to use SherpaOnnxDestroySpeechSegment() to free the returned
 // pointer to avoid memory leak.

sherpa-onnx/csrc/voice-activity-detector.cc

@@ -76,6 +76,8 @@ class VoiceActivityDetector::Impl {
 
   void Pop() { segments_.pop(); }
 
+  void Clear() { std::queue<SpeechSegment>().swap(segments_); }
+
   const SpeechSegment &Front() const { return segments_.front(); }
 
   void Reset() {
@@ -121,6 +123,8 @@ bool VoiceActivityDetector::Empty() const { return impl_->Empty(); }
 
 void VoiceActivityDetector::Pop() { impl_->Pop(); }
 
+void VoiceActivityDetector::Clear() { impl_->Clear(); }
+
 const SpeechSegment &VoiceActivityDetector::Front() const {
   return impl_->Front();
 }

sherpa-onnx/csrc/voice-activity-detector.h

@@ -36,6 +36,7 @@ class VoiceActivityDetector {
   void AcceptWaveform(const float *samples, int32_t n);
   bool Empty() const;
   void Pop();
+  void Clear();
   const SpeechSegment &Front() const;
 
   bool IsSpeechDetected() const;

sherpa-onnx/jni/jni.cc

@@ -124,6 +124,8 @@ class SherpaOnnxVad {
 
   void Pop() { vad_.Pop(); }
 
+  void Clear() { vad_.Clear();}
+
   const SpeechSegment &Front() const { return vad_.Front(); }
 
   bool IsSpeechDetected() const { return vad_.IsSpeechDetected(); }
@@ -556,6 +558,14 @@ JNIEXPORT void JNICALL Java_com_k2fsa_sherpa_onnx_Vad_pop(JNIEnv *env,
   model->Pop();
 }
 
+SHERPA_ONNX_EXTERN_C
+JNIEXPORT void JNICALL Java_com_k2fsa_sherpa_onnx_Vad_clear(JNIEnv *env,
+                                                          jobject /*obj*/,
+                                                          jlong ptr) {
+  auto model = reinterpret_cast<sherpa_onnx::SherpaOnnxVad *>(ptr);
+  model->Clear();
+}
+
 // see
 // https://stackoverflow.com/questions/29043872/android-jni-return-multiple-variables
 static jobject NewInteger(JNIEnv *env, int32_t value) {