Flutter OnlinePunctuation (#1854)

@@ -5,12 +5,13 @@ import 'dart:ffi';
 export 'src/audio_tagging.dart';
 export 'src/feature_config.dart';
 export 'src/keyword_spotter.dart';
+export 'src/offline_punctuation.dart';
 export 'src/offline_recognizer.dart';
 export 'src/offline_speaker_diarization.dart';
 export 'src/offline_stream.dart';
+export 'src/online_punctuation.dart';
 export 'src/online_recognizer.dart';
 export 'src/online_stream.dart';
-export 'src/punctuation.dart';
 export 'src/speaker_identification.dart';
 export 'src/tts.dart';
 export 'src/vad.dart';

+import 'dart:ffi';
+import 'package:ffi/ffi.dart';
+
+import './sherpa_onnx_bindings.dart';
+
+class OnlinePunctuationModelConfig {
+  OnlinePunctuationModelConfig(
+      {required this.cnnBiLstm,
+      required this.bpeVocab,
+      this.numThreads = 1,
+      this.provider = 'cpu',
+      this.debug = true});
+
+  @override
+  String toString() {
+    return 'OnlinePunctuationModelConfig(cnnBiLstm: $cnnBiLstm, '
+        'bpeVocab: $bpeVocab, numThreads: $numThreads, '
+        'provider: $provider, debug: $debug)';
+  }
+
+  final String cnnBiLstm;
+  final String bpeVocab;
+  final int numThreads;
+  final String provider;
+  final bool debug;
+}
+
+class OnlinePunctuationConfig {
+  OnlinePunctuationConfig({
+    required this.model,
+  });
+
+  @override
+  String toString() {
+    return 'OnlinePunctuationConfig(model: $model)';
+  }
+
+  final OnlinePunctuationModelConfig model;
+}
+
+class OnlinePunctuation {
+  OnlinePunctuation.fromPtr({required this.ptr, required this.config});
+
+  OnlinePunctuation._({required this.ptr, required this.config});
+
+  // The user has to invoke OnlinePunctuation.free() to avoid memory leak.
+  factory OnlinePunctuation({required OnlinePunctuationConfig config}) {
+    final c = calloc<SherpaOnnxOnlinePunctuationConfig>();
+
+    final cnnBiLstmPtr = config.model.cnnBiLstm.toNativeUtf8();
+    final bpeVocabPtr = config.model.bpeVocab.toNativeUtf8();
+    c.ref.model.cnnBiLstm = cnnBiLstmPtr;
+    c.ref.model.bpeVocab = bpeVocabPtr;
+    c.ref.model.numThreads = config.model.numThreads;
+    c.ref.model.debug = config.model.debug ? 1 : 0;
+
+    final providerPtr = config.model.provider.toNativeUtf8();
+    c.ref.model.provider = providerPtr;
+
+    final ptr = SherpaOnnxBindings.sherpaOnnxCreateOnlinePunctuation?.call(c) ??
+        nullptr;
+
+    // Free the allocated strings and struct memory
+    calloc.free(providerPtr);
+    calloc.free(cnnBiLstmPtr);
+    calloc.free(bpeVocabPtr);
+    calloc.free(c);
+
+    return OnlinePunctuation._(ptr: ptr, config: config);
+  }
+
+  void free() {
+    SherpaOnnxBindings.sherpaOnnxDestroyOnlinePunctuation?.call(ptr);
+    ptr = nullptr;
+  }
+
+  String addPunct(String text) {
+    final textPtr = text.toNativeUtf8();
+
+    final p = SherpaOnnxBindings.sherpaOnnxOnlinePunctuationAddPunct
+            ?.call(ptr, textPtr) ??
+        nullptr;
+
+    calloc.free(textPtr);
+
+    if (p == nullptr) {
+      return '';
+    }
+
+    final ans = p.toDartString();
+
+    SherpaOnnxBindings.sherpaOnnxOnlinePunctuationFreeText?.call(p);
+    
+    return ans;
+  }
+
+  Pointer<SherpaOnnxOnlinePunctuation> ptr;
+  final OnlinePunctuationConfig config;
+}

@@ -78,6 +78,20 @@ final class SherpaOnnxOfflinePunctuationConfig extends Struct {
   external SherpaOnnxOfflinePunctuationModelConfig model;
 }
 
+final class SherpaOnnxOnlinePunctuationModelConfig extends Struct {
+  external Pointer<Utf8> cnnBiLstm;
+  external Pointer<Utf8> bpeVocab;
+  @Int32()
+  external int numThreads;
+  @Int32()
+  external int debug;
+  external Pointer<Utf8> provider;
+}
+
+final class SherpaOnnxOnlinePunctuationConfig extends Struct {
+  external SherpaOnnxOnlinePunctuationModelConfig model;
+}
+
 final class SherpaOnnxOfflineZipformerAudioTaggingModelConfig extends Struct {
   external Pointer<Utf8> model;
 }
@@ -469,6 +483,8 @@ final class SherpaOnnxKeywordSpotterConfig extends Struct {
 
 final class SherpaOnnxOfflinePunctuation extends Opaque {}
 
+final class SherpaOnnxOnlinePunctuation extends Opaque {}
+
 final class SherpaOnnxAudioTagging extends Opaque {}
 
 final class SherpaOnnxKeywordSpotter extends Opaque {}
@@ -512,6 +528,10 @@ typedef SherpaOnnxCreateOfflinePunctuationNative
     = Pointer<SherpaOnnxOfflinePunctuation> Function(
         Pointer<SherpaOnnxOfflinePunctuationConfig>);
 
+typedef SherpaOnnxCreateOnlinePunctuationNative
+    = Pointer<SherpaOnnxOnlinePunctuation> Function(
+        Pointer<SherpaOnnxOnlinePunctuationConfig>);
+
 typedef SherpaOnnxOfflineSpeakerDiarizationGetSampleRateNative = Int32 Function(
     Pointer<SherpaOnnxOfflineSpeakerDiarization>);
 
@@ -605,6 +625,26 @@ typedef SherpaOfflinePunctuationFreeTextNative = Void Function(Pointer<Utf8>);
 
 typedef SherpaOfflinePunctuationFreeText = void Function(Pointer<Utf8>);
 
+typedef SherpaOnnxCreateOnlinePunctuation
+    = SherpaOnnxCreateOnlinePunctuationNative;
+
+typedef SherpaOnnxDestroyOnlinePunctuationNative = Void Function(
+    Pointer<SherpaOnnxOnlinePunctuation>);
+
+typedef SherpaOnnxDestroyOnlinePunctuation = void Function(
+    Pointer<SherpaOnnxOnlinePunctuation>);
+
+typedef SherpaOnnxOnlinePunctuationAddPunctNative = Pointer<Utf8> Function(
+    Pointer<SherpaOnnxOnlinePunctuation>, Pointer<Utf8>);
+
+typedef SherpaOnnxOnlinePunctuationAddPunct
+    = SherpaOnnxOnlinePunctuationAddPunctNative;
+
+typedef SherpaOnnxOnlinePunctuationFreeTextNative = Void Function(
+    Pointer<Utf8>);
+
+typedef SherpaOnnxOnlinePunctuationFreeText = void Function(Pointer<Utf8>);
+
 typedef SherpaOnnxCreateAudioTaggingNative = Pointer<SherpaOnnxAudioTagging>
     Function(Pointer<SherpaOnnxAudioTaggingConfig>);
 
@@ -1155,6 +1195,13 @@ class SherpaOnnxBindings {
   static SherpaOfflinePunctuationAddPunct? sherpaOfflinePunctuationAddPunct;
   static SherpaOfflinePunctuationFreeText? sherpaOfflinePunctuationFreeText;
 
+  static SherpaOnnxCreateOnlinePunctuation? sherpaOnnxCreateOnlinePunctuation;
+  static SherpaOnnxDestroyOnlinePunctuation? sherpaOnnxDestroyOnlinePunctuation;
+  static SherpaOnnxOnlinePunctuationAddPunct?
+      sherpaOnnxOnlinePunctuationAddPunct;
+  static SherpaOnnxOnlinePunctuationFreeText?
+      sherpaOnnxOnlinePunctuationFreeText;
+
   static SherpaOnnxCreateAudioTagging? sherpaOnnxCreateAudioTagging;
   static SherpaOnnxDestroyAudioTagging? sherpaOnnxDestroyAudioTagging;
   static SherpaOnnxAudioTaggingCreateOfflineStream?
@@ -1414,6 +1461,26 @@ class SherpaOnnxBindings {
             'SherpaOfflinePunctuationFreeText')
         .asFunction();
 
+    sherpaOnnxCreateOnlinePunctuation ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxCreateOnlinePunctuationNative>>(
+            'SherpaOnnxCreateOnlinePunctuation')
+        .asFunction();
+
+    sherpaOnnxDestroyOnlinePunctuation ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxDestroyOnlinePunctuationNative>>(
+            'SherpaOnnxDestroyOnlinePunctuation')
+        .asFunction();
+
+    sherpaOnnxOnlinePunctuationAddPunct ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxOnlinePunctuationAddPunctNative>>(
+            'SherpaOnnxOnlinePunctuationAddPunct')
+        .asFunction();
+
+    sherpaOnnxOnlinePunctuationFreeText ??= dynamicLibrary
+        .lookup<NativeFunction<SherpaOnnxOnlinePunctuationFreeTextNative>>(
+            'SherpaOnnxOnlinePunctuationFreeText')
+        .asFunction();
+
     sherpaOnnxCreateAudioTagging ??= dynamicLibrary
         .lookup<NativeFunction<SherpaOnnxCreateAudioTaggingNative>>(
             'SherpaOnnxCreateAudioTagging')