Add blank penalty for various language bindings. (#1234)

@@ -113,3 +113,4 @@ sherpa-onnx-telespeech-ctc-*
 lib*.a
 sherpa-onnx-sense-voice-zh-en-ja-ko-yue-2024-07-17
 *.bak
+vits-melo-tts-zh_en

+## 1.10.21
+
+* Fix ffmpeg c api example (#1185)
+* Fix splitting sentences for MeloTTS (#1186)
+* Non-streaming WebSocket client for Java. (#1190)
+* Fix copying asset files for flutter examples. (#1191)
+* Add Chinese+English tts example for flutter (#1192)
+* Add speaker identification and verification exmaple for Dart API (#1194)
+* Fix reading non-standard wav files. (#1199)
+* Add ReazonSpeech Japanese pre-trained model (#1203)
+* Describe how to add new words for MeloTTS models (#1209)
+* Remove libonnxruntime_providers_cuda.so as a dependency. (#1210)
+* Fix setting SenseVoice language. (#1214)
+* Support passing TTS callback in Swift API (#1218)
+* Add MeloTTS example for ios (#1223)
+* Add online punctuation and casing prediction model for English language (#1224)
+* Fix python two pass ASR examples (#1230)
+* Add blank penalty for various language bindings
+
 ## 1.10.20
 
 * Add Dart API for audio tagging

@@ -11,7 +11,7 @@ project(sherpa-onnx)
 # ./nodejs-addon-examples
 # ./dart-api-examples/
 # ./CHANGELOG.md
-set(SHERPA_ONNX_VERSION "1.10.20")
+set(SHERPA_ONNX_VERSION "1.10.21")
 
 # Disable warning about
 #

@@ -126,7 +126,7 @@ echo "Generate xcframework"
 
 mkdir -p "build/simulator/lib"
 for f in libkaldi-native-fbank-core.a libsherpa-onnx-c-api.a libsherpa-onnx-core.a \
-         libsherpa-onnx-fst.a libsherpa-onnx-kaldifst-core.a libkaldi-decoder-core.a libssentencepiece_core.a; do
+         libsherpa-onnx-fst.a libsherpa-onnx-fstfar.a libsherpa-onnx-kaldifst-core.a libkaldi-decoder-core.a libssentencepiece_core.a; do
   lipo -create build/simulator_arm64/lib/${f} \
                build/simulator_x86_64/lib/${f} \
        -output build/simulator/lib/${f}
@@ -139,6 +139,7 @@ libtool -static -o build/simulator/sherpa-onnx.a \
   build/simulator/lib/libsherpa-onnx-c-api.a \
   build/simulator/lib/libsherpa-onnx-core.a  \
   build/simulator/lib/libsherpa-onnx-fst.a   \
+  build/simulator/lib/libsherpa-onnx-fstfar.a   \
   build/simulator/lib/libsherpa-onnx-kaldifst-core.a \
   build/simulator/lib/libkaldi-decoder-core.a \
   build/simulator/lib/libssentencepiece_core.a
@@ -148,6 +149,7 @@ libtool -static -o build/os64/sherpa-onnx.a \
   build/os64/lib/libsherpa-onnx-c-api.a \
   build/os64/lib/libsherpa-onnx-core.a \
   build/os64/lib/libsherpa-onnx-fst.a   \
+  build/os64/lib/libsherpa-onnx-fstfar.a   \
   build/os64/lib/libsherpa-onnx-kaldifst-core.a \
   build/os64/lib/libkaldi-decoder-core.a \
   build/os64/lib/libssentencepiece_core.a

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   # sherpa_onnx:
   #   path: ../../flutter/sherpa_onnx
   path: ^1.9.0

@@ -10,7 +10,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -11,7 +11,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -8,7 +8,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -10,7 +10,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -9,7 +9,7 @@ environment:
   sdk: ^3.4.0
 
 dependencies:
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   path: ^1.9.0
   args: ^2.5.0
 

@@ -5,7 +5,7 @@ description: >
 
 publish_to: 'none'
 
-version: 1.10.20
+version: 1.10.21
 
 topics:
   - speech-recognition
@@ -30,7 +30,7 @@ dependencies:
   record: ^5.1.0
   url_launcher: ^6.2.6
 
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   # sherpa_onnx:
     # path: ../../flutter/sherpa_onnx
 

@@ -5,7 +5,7 @@ description: >
 
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
-version: 1.10.20
+version: 1.10.21
 
 environment:
   sdk: '>=3.4.0 <4.0.0'
@@ -17,7 +17,7 @@ dependencies:
   cupertino_icons: ^1.0.6
   path_provider: ^2.1.3
   path: ^1.9.0
-  sherpa_onnx: ^1.10.20
+  sherpa_onnx: ^1.10.21
   url_launcher: ^6.2.6
   audioplayers: ^5.0.0
 

@@ -159,11 +159,12 @@ class OfflineRecognizerConfig {
     this.hotwordsScore = 1.5,
     this.ruleFsts = '',
     this.ruleFars = '',
+    this.blankPenalty = 0.0,
   });
 
   @override
   String toString() {
-    return 'OfflineRecognizerConfig(feat: $feat, model: $model, lm: $lm, decodingMethod: $decodingMethod, maxActivePaths: $maxActivePaths, hotwordsFile: $hotwordsFile, hotwordsScore: $hotwordsScore, ruleFsts: $ruleFsts, ruleFars: $ruleFars)';
+    return 'OfflineRecognizerConfig(feat: $feat, model: $model, lm: $lm, decodingMethod: $decodingMethod, maxActivePaths: $maxActivePaths, hotwordsFile: $hotwordsFile, hotwordsScore: $hotwordsScore, ruleFsts: $ruleFsts, ruleFars: $ruleFars, blankPenalty: $blankPenalty)';
   }
 
   final FeatureConfig feat;
@@ -179,6 +180,8 @@ class OfflineRecognizerConfig {
 
   final String ruleFsts;
   final String ruleFars;
+
+  final double blankPenalty;
 }
 
 class OfflineRecognizerResult {
@@ -268,6 +271,8 @@ class OfflineRecognizer {
     c.ref.ruleFsts = config.ruleFsts.toNativeUtf8();
     c.ref.ruleFars = config.ruleFars.toNativeUtf8();
 
+    c.ref.blankPenalty = config.blankPenalty;
+
     final ptr = SherpaOnnxBindings.createOfflineRecognizer?.call(c) ?? nullptr;
 
     calloc.free(c.ref.ruleFars);

@@ -114,11 +114,12 @@ class OnlineRecognizerConfig {
     this.ctcFstDecoderConfig = const OnlineCtcFstDecoderConfig(),
     this.ruleFsts = '',
     this.ruleFars = '',
+    this.blankPenalty = 0.0,
   });
 
   @override
   String toString() {
-    return 'OnlineRecognizerConfig(feat: $feat, model: $model, decodingMethod: $decodingMethod, maxActivePaths: $maxActivePaths, enableEndpoint: $enableEndpoint, rule1MinTrailingSilence: $rule1MinTrailingSilence, rule2MinTrailingSilence: $rule2MinTrailingSilence, rule3MinUtteranceLength: $rule3MinUtteranceLength, hotwordsFile: $hotwordsFile, hotwordsScore: $hotwordsScore, ctcFstDecoderConfig: $ctcFstDecoderConfig, ruleFsts: $ruleFsts, ruleFars: $ruleFars)';
+    return 'OnlineRecognizerConfig(feat: $feat, model: $model, decodingMethod: $decodingMethod, maxActivePaths: $maxActivePaths, enableEndpoint: $enableEndpoint, rule1MinTrailingSilence: $rule1MinTrailingSilence, rule2MinTrailingSilence: $rule2MinTrailingSilence, rule3MinUtteranceLength: $rule3MinUtteranceLength, hotwordsFile: $hotwordsFile, hotwordsScore: $hotwordsScore, ctcFstDecoderConfig: $ctcFstDecoderConfig, ruleFsts: $ruleFsts, ruleFars: $ruleFars, blankPenalty: $blankPenalty)';
   }
 
   final FeatureConfig feat;
@@ -142,6 +143,8 @@ class OnlineRecognizerConfig {
   final OnlineCtcFstDecoderConfig ctcFstDecoderConfig;
   final String ruleFsts;
   final String ruleFars;
+
+  final double blankPenalty;
 }
 
 class OnlineRecognizerResult {
@@ -209,6 +212,8 @@ class OnlineRecognizer {
     c.ref.ruleFsts = config.ruleFsts.toNativeUtf8();
     c.ref.ruleFars = config.ruleFars.toNativeUtf8();
 
+    c.ref.blankPenalty = config.blankPenalty;
+
     final ptr = SherpaOnnxBindings.createOnlineRecognizer?.call(c) ?? nullptr;
 
     calloc.free(c.ref.ruleFars);

@@ -194,6 +194,9 @@ final class SherpaOnnxOfflineRecognizerConfig extends Struct {
 
   external Pointer<Utf8> ruleFsts;
   external Pointer<Utf8> ruleFars;
+
+  @Float()
+  external double blankPenalty;
 }
 
 final class SherpaOnnxOnlineTransducerModelConfig extends Struct {
@@ -269,6 +272,9 @@ final class SherpaOnnxOnlineRecognizerConfig extends Struct {
 
   external Pointer<Utf8> ruleFsts;
   external Pointer<Utf8> ruleFars;
+
+  @Float()
+  external double blankPenalty;
 }
 
 final class SherpaOnnxSileroVadModelConfig extends Struct {

@@ -17,7 +17,7 @@ topics:
   - voice-activity-detection
 
 # remember to change the version in ../sherpa_onnx_macos/macos/sherpa_onnx_macos.podspec
-version: 1.10.20
+version: 1.10.21
 
 homepage: https://github.com/k2-fsa/sherpa-onnx
 
@@ -30,23 +30,23 @@ dependencies:
   flutter:
     sdk: flutter
 
-  sherpa_onnx_android: ^1.10.20
+  sherpa_onnx_android: ^1.10.21
   # sherpa_onnx_android:
   #   path: ../sherpa_onnx_android
 
-  sherpa_onnx_macos: ^1.10.20
+  sherpa_onnx_macos: ^1.10.21
   # sherpa_onnx_macos:
   #   path: ../sherpa_onnx_macos
 
-  sherpa_onnx_linux: ^1.10.20
+  sherpa_onnx_linux: ^1.10.21
   # sherpa_onnx_linux:
   #   path: ../sherpa_onnx_linux
     #
-  sherpa_onnx_windows: ^1.10.20
+  sherpa_onnx_windows: ^1.10.21
   # sherpa_onnx_windows:
   #   path: ../sherpa_onnx_windows
 
-  sherpa_onnx_ios: ^1.10.20
+  sherpa_onnx_ios: ^1.10.21
   # sherpa_onnx_ios:
   #   path: ../sherpa_onnx_ios
 

@@ -7,7 +7,7 @@
 # https://groups.google.com/g/dart-ffi/c/nUATMBy7r0c
 Pod::Spec.new do |s|
   s.name             = 'sherpa_onnx_ios'
-  s.version          = '1.10.20'
+  s.version          = '1.10.21'
   s.summary          = 'A new Flutter FFI plugin project.'
   s.description      = <<-DESC
 A new Flutter FFI plugin project.

@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'sherpa_onnx_macos'
-  s.version          = '1.10.20'
+  s.version          = '1.10.21'
   s.summary          = 'sherpa-onnx Flutter FFI plugin project.'
   s.description      = <<-DESC
 sherpa-onnx Flutter FFI plugin project.

 {
   "dependencies": {
-    "sherpa-onnx-node": "^1.10.20"
+    "sherpa-onnx-node": "^1.10.21"
   }
 }

@@ -4,7 +4,6 @@ using System.Runtime.InteropServices;
 
 namespace SherpaOnnx
 {
-
     [StructLayout(LayoutKind.Sequential)]
     public struct OfflineRecognizerConfig
     {
@@ -20,6 +19,7 @@ namespace SherpaOnnx
             HotwordsScore = 1.5F;
             RuleFsts = "";
             RuleFars = "";
+            BlankPenalty = 0.0F;
         }
         public FeatureConfig FeatConfig;
         public OfflineModelConfig ModelConfig;
@@ -40,7 +40,7 @@ namespace SherpaOnnx
 
         [MarshalAs(UnmanagedType.LPStr)]
         public string RuleFars;
-    }
 
-
-}
\ No newline at end of file
+        public float BlankPenalty;
+    }
+}

@@ -25,6 +25,7 @@ namespace SherpaOnnx
             CtcFstDecoderConfig = new OnlineCtcFstDecoderConfig();
             RuleFsts = "";
             RuleFars = "";
+            BlankPenalty = 0.0F;
         }
         public FeatureConfig FeatConfig;
         public OnlineModelConfig ModelConfig;
@@ -69,6 +70,7 @@ namespace SherpaOnnx
 
         [MarshalAs(UnmanagedType.LPStr)]
         public string RuleFars;
-    }
 
-}
\ No newline at end of file
+        public float BlankPenalty;
+    }
+}

@@ -201,6 +201,7 @@ CreateOfflineRecognizerWrapper(const Napi::CallbackInfo &info) {
   SHERPA_ONNX_ASSIGN_ATTR_FLOAT(hotwords_score, hotwordsScore);
   SHERPA_ONNX_ASSIGN_ATTR_STR(rule_fsts, ruleFsts);
   SHERPA_ONNX_ASSIGN_ATTR_STR(rule_fars, ruleFars);
+  SHERPA_ONNX_ASSIGN_ATTR_FLOAT(blank_penalty, blankPenalty);
 
   SherpaOnnxOfflineRecognizer *recognizer =
       SherpaOnnxCreateOfflineRecognizer(&c);

@@ -191,6 +191,7 @@ static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
   SHERPA_ONNX_ASSIGN_ATTR_FLOAT(hotwords_score, hotwordsScore);
   SHERPA_ONNX_ASSIGN_ATTR_STR(rule_fsts, ruleFsts);
   SHERPA_ONNX_ASSIGN_ATTR_STR(rule_fars, ruleFars);
+  SHERPA_ONNX_ASSIGN_ATTR_FLOAT(blank_penalty, blankPenalty);
 
   c.ctc_fst_decoder_config = GetCtcFstDecoderConfig(o);
 

@@ -105,7 +105,7 @@ SherpaOnnxOnlineRecognizer *SherpaOnnxCreateOnlineRecognizer(
   recognizer_config.hotwords_score =
       SHERPA_ONNX_OR(config->hotwords_score, 1.5);
 
-  recognizer_config.blank_penalty = SHERPA_ONNX_OR(config->blank_penalty, 0.0);
+  recognizer_config.blank_penalty = config->blank_penalty;
 
   recognizer_config.ctc_fst_decoder_config.graph =
       SHERPA_ONNX_OR(config->ctc_fst_decoder_config.graph, "");
@@ -429,6 +429,8 @@ sherpa_onnx::OfflineRecognizerConfig convertConfig(
   recognizer_config.hotwords_score =
       SHERPA_ONNX_OR(config->hotwords_score, 1.5);
 
+  recognizer_config.blank_penalty = config->blank_penalty;
+
   recognizer_config.rule_fsts = SHERPA_ONNX_OR(config->rule_fsts, "");
   recognizer_config.rule_fars = SHERPA_ONNX_OR(config->rule_fars, "");
 

@@ -142,11 +142,11 @@ SHERPA_ONNX_API typedef struct SherpaOnnxOnlineRecognizerConfig {
 
   /// Bonus score for each token in hotwords.
   float hotwords_score;
-  float blank_penalty;
 
   SherpaOnnxOnlineCtcFstDecoderConfig ctc_fst_decoder_config;
   const char *rule_fsts;
   const char *rule_fars;
+  float blank_penalty;
 } SherpaOnnxOnlineRecognizerConfig;
 
 SHERPA_ONNX_API typedef struct SherpaOnnxOnlineRecognizerResult {
@@ -430,6 +430,7 @@ SHERPA_ONNX_API typedef struct SherpaOnnxOfflineRecognizerConfig {
   float hotwords_score;
   const char *rule_fsts;
   const char *rule_fars;
+  float blank_penalty;
 } SherpaOnnxOfflineRecognizerConfig;
 
 SHERPA_ONNX_API typedef struct SherpaOnnxOfflineRecognizer

@@ -11,6 +11,7 @@ public class OfflineRecognizerConfig {
     private final float hotwordsScore;
     private final String ruleFsts;
     private final String ruleFars;
+    private final float blankPenalty;
 
     private OfflineRecognizerConfig(Builder builder) {
         this.featConfig = builder.featConfig;
@@ -21,6 +22,7 @@ public class OfflineRecognizerConfig {
         this.hotwordsScore = builder.hotwordsScore;
         this.ruleFsts = builder.ruleFsts;
         this.ruleFars = builder.ruleFars;
+        this.blankPenalty = builder.blankPenalty;
     }
 
     public static Builder builder() {
@@ -40,6 +42,7 @@ public class OfflineRecognizerConfig {
         private float hotwordsScore = 1.5f;
         private String ruleFsts = "";
         private String ruleFars = "";
+        private float blankPenalty = 0.0f;
 
         public OfflineRecognizerConfig build() {
             return new OfflineRecognizerConfig(this);
@@ -84,5 +87,10 @@ public class OfflineRecognizerConfig {
             this.ruleFars = ruleFars;
             return this;
         }
+
+        public Builder setBlankPenalty(float blankPenalty) {
+            this.blankPenalty = blankPenalty;
+            return this;
+        }
     }
 }

@@ -17,6 +17,7 @@ public class OnlineRecognizerConfig {
     private final float hotwordsScore;
     private final String ruleFsts;
     private final String ruleFars;
+    private final float blankPenalty;
 
     private OnlineRecognizerConfig(Builder builder) {
         this.featConfig = builder.featConfig;
@@ -31,6 +32,7 @@ public class OnlineRecognizerConfig {
         this.hotwordsScore = builder.hotwordsScore;
         this.ruleFsts = builder.ruleFsts;
         this.ruleFars = builder.ruleFars;
+        this.blankPenalty = builder.blankPenalty;
     }
 
     public static Builder builder() {
@@ -54,6 +56,7 @@ public class OnlineRecognizerConfig {
         private float hotwordsScore = 1.5f;
         private String ruleFsts = "";
         private String ruleFars = "";
+        private float blankPenalty = 0.0f;
 
         public OnlineRecognizerConfig build() {
             return new OnlineRecognizerConfig(this);
@@ -118,5 +121,10 @@ public class OnlineRecognizerConfig {
             this.ruleFars = ruleFars;
             return this;
         }
+
+        public Builder setBlankPenalty(float blankPenalty) {
+            this.blankPenalty = blankPenalty;
+            return this;
+        }
     }
 }

@@ -46,6 +46,9 @@ static OfflineRecognizerConfig GetOfflineConfig(JNIEnv *env, jobject config) {
   ans.rule_fars = p;
   env->ReleaseStringUTFChars(s, p);
 
+  fid = env->GetFieldID(cls, "blankPenalty", "F");
+  ans.blank_penalty = env->GetFloatField(config, fid);
+
   //---------- feat config ----------
   fid = env->GetFieldID(cls, "featConfig",
                         "Lcom/k2fsa/sherpa/onnx/FeatureConfig;");

@@ -49,6 +49,9 @@ static OnlineRecognizerConfig GetConfig(JNIEnv *env, jobject config) {
   ans.rule_fars = p;
   env->ReleaseStringUTFChars(s, p);
 
+  fid = env->GetFieldID(cls, "blankPenalty", "F");
+  ans.blank_penalty = env->GetFloatField(config, fid);
+
   //---------- feat config ----------
   fid = env->GetFieldID(cls, "featConfig",
                         "Lcom/k2fsa/sherpa/onnx/FeatureConfig;");

@@ -62,6 +62,7 @@ data class OfflineRecognizerConfig(
     var hotwordsScore: Float = 1.5f,
     var ruleFsts: String = "",
     var ruleFars: String = "",
+    var blankPenalty: Float = 0.0f,
 )
 
 class OfflineRecognizer(

@@ -71,6 +71,7 @@ data class OnlineRecognizerConfig(
     var hotwordsScore: Float = 1.5f,
     var ruleFsts: String = "",
     var ruleFars: String = "",
+    var blankPenalty: Float = 0.0f,
 )
 
 data class OnlineRecognizerResult(

@@ -137,7 +137,8 @@ func sherpaOnnxOnlineRecognizerConfig(
   hotwordsScore: Float = 1.5,
   ctcFstDecoderConfig: SherpaOnnxOnlineCtcFstDecoderConfig = sherpaOnnxOnlineCtcFstDecoderConfig(),
   ruleFsts: String = "",
-  ruleFars: String = ""
+  ruleFars: String = "",
+  blankPenalty: Float = 0.0
 ) -> SherpaOnnxOnlineRecognizerConfig {
   return SherpaOnnxOnlineRecognizerConfig(
     feat_config: featConfig,
@@ -152,7 +153,8 @@ func sherpaOnnxOnlineRecognizerConfig(
     hotwords_score: hotwordsScore,
     ctc_fst_decoder_config: ctcFstDecoderConfig,
     rule_fsts: toCPointer(ruleFsts),
-    rule_fars: toCPointer(ruleFars)
+    rule_fars: toCPointer(ruleFars),
+    blank_penalty: blankPenalty
   )
 }
 
@@ -420,7 +422,8 @@ func sherpaOnnxOfflineRecognizerConfig(
   hotwordsFile: String = "",
   hotwordsScore: Float = 1.5,
   ruleFsts: String = "",
-  ruleFars: String = ""
+  ruleFars: String = "",
+  blankPenalty: Float = 0.0
 ) -> SherpaOnnxOfflineRecognizerConfig {
   return SherpaOnnxOfflineRecognizerConfig(
     feat_config: featConfig,
@@ -431,7 +434,8 @@ func sherpaOnnxOfflineRecognizerConfig(
     hotwords_file: toCPointer(hotwordsFile),
     hotwords_score: hotwordsScore,
     rule_fsts: toCPointer(ruleFsts),
-    rule_fars: toCPointer(ruleFars)
+    rule_fars: toCPointer(ruleFars),
+    blank_penalty: blankPenalty
   )
 }
 

@@ -280,7 +280,7 @@ function initSherpaOnnxOnlineRecognizerConfig(config, Module) {
   const ctcFstDecoder = initSherpaOnnxOnlineCtcFstDecoderConfig(
       config.ctcFstDecoderConfig, Module)
 
-  const len = feat.len + model.len + 8 * 4 + ctcFstDecoder.len + 2 * 4;
+  const len = feat.len + model.len + 8 * 4 + ctcFstDecoder.len + 3 * 4;
   const ptr = Module._malloc(len);
 
   let offset = 0;
@@ -351,6 +351,9 @@ function initSherpaOnnxOnlineRecognizerConfig(config, Module) {
       buffer + decodingMethodLen + hotwordsFileLen + ruleFstsFileLen, 'i8*');
   offset += 4;
 
+  Module.setValue(ptr + offset, config.blankPenalty || 0, 'float');
+  offset += 4;
+
   return {
     buffer: buffer, ptr: ptr, len: len, feat: feat, model: model,
         ctcFstDecoder: ctcFstDecoder
@@ -796,7 +799,7 @@ function initSherpaOnnxOfflineRecognizerConfig(config, Module) {
   const model = initSherpaOnnxOfflineModelConfig(config.modelConfig, Module);
   const lm = initSherpaOnnxOfflineLMConfig(config.lmConfig, Module);
 
-  const len = feat.len + model.len + lm.len + 6 * 4;
+  const len = feat.len + model.len + lm.len + 7 * 4;
   const ptr = Module._malloc(len);
 
   let offset = 0;
@@ -856,6 +859,9 @@ function initSherpaOnnxOfflineRecognizerConfig(config, Module) {
       'i8*');
   offset += 4;
 
+  Module.setValue(ptr + offset, config.blankPenalty || 0, 'float');
+  offset += 4;
+
   return {
     buffer: buffer, ptr: ptr, len: len, feat: feat, model: model, lm: lm
   }

@@ -26,7 +26,7 @@ static_assert(sizeof(SherpaOnnxOnlineCtcFstDecoderConfig) == 2 * 4, "");
 static_assert(sizeof(SherpaOnnxOnlineRecognizerConfig) ==
                   sizeof(SherpaOnnxFeatureConfig) +
                       sizeof(SherpaOnnxOnlineModelConfig) + 8 * 4 +
-                      sizeof(SherpaOnnxOnlineCtcFstDecoderConfig) + 2 * 4,
+                      sizeof(SherpaOnnxOnlineCtcFstDecoderConfig) + 3 * 4,
               "");
 
 void MyPrint(SherpaOnnxOnlineRecognizerConfig *config) {
@@ -73,6 +73,7 @@ void MyPrint(SherpaOnnxOnlineRecognizerConfig *config) {
   fprintf(stdout, "hotwords_score: %.2f\n", config->hotwords_score);
   fprintf(stdout, "rule_fsts: %s\n", config->rule_fsts);
   fprintf(stdout, "rule_fars: %s\n", config->rule_fars);
+  fprintf(stdout, "blank_penalty: %f\n", config->blank_penalty);
 
   fprintf(stdout, "----------ctc fst decoder config----------\n");
   fprintf(stdout, "graph: %s\n", config->ctc_fst_decoder_config.graph);

@@ -31,7 +31,7 @@ static_assert(sizeof(SherpaOnnxFeatureConfig) == 2 * 4, "");
 static_assert(sizeof(SherpaOnnxOfflineRecognizerConfig) ==
                   sizeof(SherpaOnnxFeatureConfig) +
                       sizeof(SherpaOnnxOfflineLMConfig) +
-                      sizeof(SherpaOnnxOfflineModelConfig) + 6 * 4,
+                      sizeof(SherpaOnnxOfflineModelConfig) + 7 * 4,
               "");
 
 void PrintOfflineTtsConfig(SherpaOnnxOfflineTtsConfig *tts_config) {
@@ -113,6 +113,7 @@ void PrintOfflineRecognizerConfig(SherpaOnnxOfflineRecognizerConfig *config) {
   fprintf(stdout, "hotwords_score: %.2f\n", config->hotwords_score);
   fprintf(stdout, "rule_fsts: %s\n", config->rule_fsts);
   fprintf(stdout, "rule_fars: %s\n", config->rule_fars);
+  fprintf(stdout, "blank_penalty: %f\n", config->blank_penalty);
 }
 
 void CopyHeap(const char *src, int32_t num_bytes, char *dst) {