Add Kotlin and Java APIs for Moonshine v2 models (#3237)

Adds Android-side configuration and packaging support for Moonshine v2 (merged decoder) models so Kotlin/JNI and Java consumers can use the new model layout and ship additional language variants.

Changes:

- Extend Moonshine offline model config to include a v2 mergedDecoder model path and wire it through JNI.
- Add Moonshine v2 quantized model presets (idx 51–60) for multiple languages in the Kotlin offline model selector.
- Update Moonshine v2 export script + APK model list + GitHub Actions workflow to include new model variants and streamline publishing.

java-api-examples/NonStreamingDecodeFileMoonshineV2.java

@@ -0,0 +1,53 @@
+// Copyright 2024 Xiaomi Corporation
+
+// This file shows how to use an offline Moonshine,
+// i.e., non-streaming Moonshine v2 model,
+// to decode files.
+import com.k2fsa.sherpa.onnx.*;
+
+public class NonStreamingDecodeFileMoonshineV2 {
+  public static void main(String[] args) {
+    // please refer to
+    // https://k2-fsa.github.io/sherpa/onnx/moonshine/index.html
+    // to download model files
+
+    String encoder = "./sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27/encoder_model.ort";
+    String decoder =
+        "./sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27/decoder_model_merged.ort";
+    String tokens = "./sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27/tokens.txt";
+
+    String waveFilename = "./sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27/test_wavs/0.wav";
+
+    WaveReader reader = new WaveReader(waveFilename);
+
+    OfflineMoonshineModelConfig moonshine =
+        OfflineMoonshineModelConfig.builder().setEncoder(encoder).setMergedDecoder(decoder).build();
+
+    OfflineModelConfig modelConfig =
+        OfflineModelConfig.builder()
+            .setMoonshine(moonshine)
+            .setTokens(tokens)
+            .setNumThreads(1)
+            .setDebug(true)
+            .build();
+
+    OfflineRecognizerConfig config =
+        OfflineRecognizerConfig.builder()
+            .setOfflineModelConfig(modelConfig)
+            .setDecodingMethod("greedy_search")
+            .build();
+
+    OfflineRecognizer recognizer = new OfflineRecognizer(config);
+    OfflineStream stream = recognizer.createStream();
+    stream.acceptWaveform(reader.getSamples(), reader.getSampleRate());
+
+    recognizer.decode(stream);
+
+    String text = recognizer.getResult(stream).getText();
+
+    System.out.printf("filename:%s\nresult:%s\n", waveFilename, text);
+
+    stream.release();
+    recognizer.release();
+  }
+}

java-api-examples/README.md

@@ -30,6 +30,7 @@ This directory contains examples for the JAVA API of sherpa-onnx.
 ./run-non-streaming-decode-file-funasr-nano.sh
 ./run-non-streaming-decode-file-medasr-ctc.sh
 ./run-non-streaming-decode-file-moonshine.sh
+./run-non-streaming-decode-file-moonshine-v2.sh
 ./run-non-streaming-decode-file-nemo-canary.sh
 ./run-non-streaming-decode-file-nemo.sh
 ./run-non-streaming-decode-file-omnilingual-asr-ctc.sh

java-api-examples/run-non-streaming-decode-file-moonshine-v2.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -ex
+
+if [[ ! -f ../build/lib/libsherpa-onnx-jni.dylib  && ! -f ../build/lib/libsherpa-onnx-jni.so ]]; then
+  mkdir -p ../build
+  pushd ../build
+  cmake \
+    -DSHERPA_ONNX_ENABLE_PYTHON=OFF \
+    -DSHERPA_ONNX_ENABLE_TESTS=OFF \
+    -DSHERPA_ONNX_ENABLE_CHECK=OFF \
+    -DBUILD_SHARED_LIBS=ON \
+    -DSHERPA_ONNX_ENABLE_PORTAUDIO=OFF \
+    -DSHERPA_ONNX_ENABLE_JNI=ON \
+    ..
+
+  make -j4
+  ls -lh lib
+  popd
+fi
+
+if [ ! -f ../sherpa-onnx/java-api/build/sherpa-onnx.jar ]; then
+  pushd ../sherpa-onnx/java-api
+  make
+  popd
+fi
+
+if [ ! -f ./sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27/tokens.txt ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27.tar.bz2
+  tar xvf sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27.tar.bz2
+  rm sherpa-onnx-moonshine-tiny-en-quantized-2026-02-27.tar.bz2
+fi
+
+java \
+  -Djava.library.path=$PWD/../build/lib \
+  -cp ../sherpa-onnx/java-api/build/sherpa-onnx.jar \
+  NonStreamingDecodeFileMoonshineV2.java