Add Dart API for FireRedAsr AED Model (#1877)

.github/scripts/test-dart.sh

@@ -92,6 +92,10 @@ popd
 
 pushd non-streaming-asr
 
+echo '----------FireRedAsr----------'
+./run-fire-red-asr.sh
+rm -rf sherpa-onnx-fire-red-asr-*
+
 echo '----------SenseVoice----------'
 ./run-sense-voice.sh
 rm -rf sherpa-onnx-*

dart-api-examples/non-streaming-asr/bin/fire-red-asr.dart

@@ -0,0 +1,58 @@
+// Copyright (c)  2025  Xiaomi Corporation
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:sherpa_onnx/sherpa_onnx.dart' as sherpa_onnx;
+
+import './init.dart';
+
+void main(List<String> arguments) async {
+  await initSherpaOnnx();
+
+  final parser = ArgParser()
+    ..addOption('encoder', help: 'Path to the FireRedAsr encoder model')
+    ..addOption('decoder', help: 'Path to FireRedAsr decoder model')
+    ..addOption('tokens', help: 'Path to tokens.txt')
+    ..addOption('input-wav', help: 'Path to input.wav to transcribe');
+
+  final res = parser.parse(arguments);
+  if (res['encoder'] == null ||
+      res['decoder'] == null ||
+      res['tokens'] == null ||
+      res['input-wav'] == null) {
+    print(parser.usage);
+    exit(1);
+  }
+
+  final encoder = res['encoder'] as String;
+  final decoder = res['decoder'] as String;
+  final tokens = res['tokens'] as String;
+  final inputWav = res['input-wav'] as String;
+
+  final fireRedAsr = sherpa_onnx.OfflineFireRedAsrModelConfig(
+    encoder: encoder,
+    decoder: decoder,
+  );
+
+  final modelConfig = sherpa_onnx.OfflineModelConfig(
+    fireRedAsr: fireRedAsr,
+    tokens: tokens,
+    debug: false,
+    numThreads: 1,
+  );
+  final config = sherpa_onnx.OfflineRecognizerConfig(model: modelConfig);
+  final recognizer = sherpa_onnx.OfflineRecognizer(config);
+
+  final waveData = sherpa_onnx.readWave(inputWav);
+  final stream = recognizer.createStream();
+
+  stream.acceptWaveform(
+      samples: waveData.samples, sampleRate: waveData.sampleRate);
+  recognizer.decode(stream);
+
+  final result = recognizer.getResult(stream);
+  print(result.text);
+
+  stream.free();
+  recognizer.free();
+}

dart-api-examples/non-streaming-asr/run-fire-red-asr.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [ ! -f ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/encoder.int8.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  tar xvf sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  rm sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  ls -lh sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16
+fi
+
+dart pub get
+
+dart run \
+  ./bin/fire-red-asr.dart \
+  --encoder ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/encoder.int8.onnx \
+  --decoder ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/decoder.int8.onnx \
+  --tokens ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/tokens.txt \
+  --input-wav ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/test_wavs/0.wav

dotnet-examples/offline-decode-files/run-fire-red-asr.sh

@@ -2,12 +2,12 @@
 
 set -ex
 
-  if [ ! -f ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/encoder.int8.onnx ]; then
-    curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
-    tar xvf sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
-    rm sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
-    ls -lh sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16
-  fi
+if [ ! -f ./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/encoder.int8.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  tar xvf sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  rm sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+  ls -lh sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16
+fi
 
 dotnet run \
   --num-threads=2 \

flutter/sherpa_onnx/lib/src/offline_recognizer.dart

@@ -68,6 +68,20 @@ class OfflineWhisperModelConfig {
   final int tailPaddings;
 }
 
+class OfflineFireRedAsrModelConfig {
+  const OfflineFireRedAsrModelConfig(
+      {this.encoder = '',
+      this.decoder = ''});
+
+  @override
+  String toString() {
+    return 'OfflineFireRedAsrModelConfig(encoder: $encoder, decoder: $decoder)';
+  }
+
+  final String encoder;
+  final String decoder;
+}
+
 class OfflineMoonshineModelConfig {
   const OfflineMoonshineModelConfig(
       {this.preprocessor = '',
@@ -135,6 +149,7 @@ class OfflineModelConfig {
     this.tdnn = const OfflineTdnnModelConfig(),
     this.senseVoice = const OfflineSenseVoiceModelConfig(),
     this.moonshine = const OfflineMoonshineModelConfig(),
+    this.fireRedAsr = const OfflineFireRedAsrModelConfig(),
     required this.tokens,
     this.numThreads = 1,
     this.debug = true,
@@ -147,7 +162,7 @@ class OfflineModelConfig {
 
   @override
   String toString() {
-    return 'OfflineModelConfig(transducer: $transducer, paraformer: $paraformer, nemoCtc: $nemoCtc, whisper: $whisper, tdnn: $tdnn, senseVoice: $senseVoice, moonshine: $moonshine, tokens: $tokens, numThreads: $numThreads, debug: $debug, provider: $provider, modelType: $modelType, modelingUnit: $modelingUnit, bpeVocab: $bpeVocab, telespeechCtc: $telespeechCtc)';
+    return 'OfflineModelConfig(transducer: $transducer, paraformer: $paraformer, nemoCtc: $nemoCtc, whisper: $whisper, tdnn: $tdnn, senseVoice: $senseVoice, moonshine: $moonshine, fireRedAsr: $fireRedAsr, tokens: $tokens, numThreads: $numThreads, debug: $debug, provider: $provider, modelType: $modelType, modelingUnit: $modelingUnit, bpeVocab: $bpeVocab, telespeechCtc: $telespeechCtc)';
   }
 
   final OfflineTransducerModelConfig transducer;
@@ -157,6 +172,7 @@ class OfflineModelConfig {
   final OfflineTdnnModelConfig tdnn;
   final OfflineSenseVoiceModelConfig senseVoice;
   final OfflineMoonshineModelConfig moonshine;
+  final OfflineFireRedAsrModelConfig fireRedAsr;
 
   final String tokens;
   final int numThreads;
@@ -288,6 +304,10 @@ class OfflineRecognizer {
     c.ref.model.moonshine.cachedDecoder =
         config.model.moonshine.cachedDecoder.toNativeUtf8();
 
+    // FireRedAsr
+    c.ref.model.fireRedAsr.encoder = config.model.fireRedAsr.encoder.toNativeUtf8();
+    c.ref.model.fireRedAsr.decoder = config.model.fireRedAsr.decoder.toNativeUtf8();
+
     c.ref.model.tokens = config.model.tokens.toNativeUtf8();
 
     c.ref.model.numThreads = config.model.numThreads;
@@ -325,6 +345,8 @@ class OfflineRecognizer {
     calloc.free(c.ref.model.modelType);
     calloc.free(c.ref.model.provider);
     calloc.free(c.ref.model.tokens);
+    calloc.free(c.ref.model.fireRedAsr.decoder);
+    calloc.free(c.ref.model.fireRedAsr.encoder);
     calloc.free(c.ref.model.moonshine.cachedDecoder);
     calloc.free(c.ref.model.moonshine.uncachedDecoder);
     calloc.free(c.ref.model.moonshine.encoder);

flutter/sherpa_onnx/lib/src/sherpa_onnx_bindings.dart

@@ -248,6 +248,11 @@ final class SherpaOnnxOfflineMoonshineModelConfig extends Struct {
   external Pointer<Utf8> cachedDecoder;
 }
 
+final class SherpaOnnxOfflineFireRedAsrModelConfig extends Struct {
+  external Pointer<Utf8> encoder;
+  external Pointer<Utf8> decoder;
+}
+
 final class SherpaOnnxOfflineTdnnModelConfig extends Struct {
   external Pointer<Utf8> model;
 }
@@ -291,6 +296,7 @@ final class SherpaOnnxOfflineModelConfig extends Struct {
 
   external SherpaOnnxOfflineSenseVoiceModelConfig senseVoice;
   external SherpaOnnxOfflineMoonshineModelConfig moonshine;
+  external SherpaOnnxOfflineFireRedAsrModelConfig fireRedAsr;
 }
 
 final class SherpaOnnxOfflineRecognizerConfig extends Struct {