Refactor the JNI interface to make it more modular and maintainable (#802)
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Fangjun Kuang
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sherpa-onnx/jni/keyword-spotter.cc
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233
sherpa-onnx/jni/keyword-spotter.cc
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// sherpa-onnx/jni/keyword-spotter.cc
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//
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// Copyright (c) 2024 Xiaomi Corporation
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#include "sherpa-onnx/csrc/keyword-spotter.h"
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#include "sherpa-onnx/csrc/macros.h"
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#include "sherpa-onnx/jni/common.h"
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namespace sherpa_onnx {
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static KeywordSpotterConfig GetKwsConfig(JNIEnv *env, jobject config) {
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KeywordSpotterConfig ans;
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jclass cls = env->GetObjectClass(config);
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jfieldID fid;
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// https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/types.html
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// https://courses.cs.washington.edu/courses/cse341/99wi/java/tutorial/native1.1/implementing/field.html
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//---------- decoding ----------
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fid = env->GetFieldID(cls, "maxActivePaths", "I");
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ans.max_active_paths = env->GetIntField(config, fid);
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fid = env->GetFieldID(cls, "keywordsFile", "Ljava/lang/String;");
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jstring s = (jstring)env->GetObjectField(config, fid);
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const char *p = env->GetStringUTFChars(s, nullptr);
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ans.keywords_file = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(cls, "keywordsScore", "F");
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ans.keywords_score = env->GetFloatField(config, fid);
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fid = env->GetFieldID(cls, "keywordsThreshold", "F");
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ans.keywords_threshold = env->GetFloatField(config, fid);
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fid = env->GetFieldID(cls, "numTrailingBlanks", "I");
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ans.num_trailing_blanks = env->GetIntField(config, fid);
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//---------- feat config ----------
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fid = env->GetFieldID(cls, "featConfig",
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"Lcom/k2fsa/sherpa/onnx/FeatureConfig;");
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jobject feat_config = env->GetObjectField(config, fid);
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jclass feat_config_cls = env->GetObjectClass(feat_config);
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fid = env->GetFieldID(feat_config_cls, "sampleRate", "I");
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ans.feat_config.sampling_rate = env->GetIntField(feat_config, fid);
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fid = env->GetFieldID(feat_config_cls, "featureDim", "I");
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ans.feat_config.feature_dim = env->GetIntField(feat_config, fid);
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//---------- model config ----------
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fid = env->GetFieldID(cls, "modelConfig",
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"Lcom/k2fsa/sherpa/onnx/OnlineModelConfig;");
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jobject model_config = env->GetObjectField(config, fid);
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jclass model_config_cls = env->GetObjectClass(model_config);
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// transducer
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fid = env->GetFieldID(model_config_cls, "transducer",
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"Lcom/k2fsa/sherpa/onnx/OnlineTransducerModelConfig;");
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jobject transducer_config = env->GetObjectField(model_config, fid);
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jclass transducer_config_cls = env->GetObjectClass(transducer_config);
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fid = env->GetFieldID(transducer_config_cls, "encoder", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(transducer_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.transducer.encoder = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(transducer_config_cls, "decoder", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(transducer_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.transducer.decoder = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(transducer_config_cls, "joiner", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(transducer_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.transducer.joiner = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(model_config_cls, "tokens", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(model_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.tokens = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(model_config_cls, "numThreads", "I");
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ans.model_config.num_threads = env->GetIntField(model_config, fid);
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fid = env->GetFieldID(model_config_cls, "debug", "Z");
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ans.model_config.debug = env->GetBooleanField(model_config, fid);
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fid = env->GetFieldID(model_config_cls, "provider", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(model_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.provider = p;
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env->ReleaseStringUTFChars(s, p);
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fid = env->GetFieldID(model_config_cls, "modelType", "Ljava/lang/String;");
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s = (jstring)env->GetObjectField(model_config, fid);
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p = env->GetStringUTFChars(s, nullptr);
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ans.model_config.model_type = p;
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env->ReleaseStringUTFChars(s, p);
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return ans;
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}
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} // namespace sherpa_onnx
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT jlong JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_newFromAsset(
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JNIEnv *env, jobject /*obj*/, jobject asset_manager, jobject _config) {
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#if __ANDROID_API__ >= 9
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AAssetManager *mgr = AAssetManager_fromJava(env, asset_manager);
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if (!mgr) {
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SHERPA_ONNX_LOGE("Failed to get asset manager: %p", mgr);
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}
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#endif
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auto config = sherpa_onnx::GetKwsConfig(env, _config);
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SHERPA_ONNX_LOGE("config:\n%s", config.ToString().c_str());
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auto kws = new sherpa_onnx::KeywordSpotter(
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#if __ANDROID_API__ >= 9
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mgr,
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#endif
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config);
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return (jlong)kws;
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT jlong JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_newFromFile(
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JNIEnv *env, jobject /*obj*/, jobject _config) {
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auto config = sherpa_onnx::GetKwsConfig(env, _config);
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SHERPA_ONNX_LOGE("config:\n%s", config.ToString().c_str());
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if (!config.Validate()) {
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SHERPA_ONNX_LOGE("Errors found in config!");
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return 0;
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}
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auto kws = new sherpa_onnx::KeywordSpotter(config);
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return (jlong)kws;
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT void JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_delete(
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JNIEnv *env, jobject /*obj*/, jlong ptr) {
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delete reinterpret_cast<sherpa_onnx::KeywordSpotter *>(ptr);
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT void JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_decode(
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JNIEnv *env, jobject /*obj*/, jlong ptr, jlong stream_ptr) {
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auto kws = reinterpret_cast<sherpa_onnx::KeywordSpotter *>(ptr);
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auto stream = reinterpret_cast<sherpa_onnx::OnlineStream *>(stream_ptr);
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kws->DecodeStream(stream);
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT jlong JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_createStream(
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JNIEnv *env, jobject /*obj*/, jlong ptr, jstring keywords) {
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auto kws = reinterpret_cast<sherpa_onnx::KeywordSpotter *>(ptr);
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const char *p = env->GetStringUTFChars(keywords, nullptr);
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std::unique_ptr<sherpa_onnx::OnlineStream> stream;
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if (strlen(p) == 0) {
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stream = kws->CreateStream();
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} else {
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stream = kws->CreateStream(p);
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}
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env->ReleaseStringUTFChars(keywords, p);
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// The user is responsible to free the returned pointer.
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//
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// See Java_com_k2fsa_sherpa_onnx_OfflineStream_delete() from
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// ./offline-stream.cc
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sherpa_onnx::OnlineStream *ans = stream.release();
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return (jlong)ans;
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT bool JNICALL Java_com_k2fsa_sherpa_onnx_KeywordSpotter_isReady(
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JNIEnv *env, jobject /*obj*/, jlong ptr, jlong stream_ptr) {
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auto kws = reinterpret_cast<sherpa_onnx::KeywordSpotter *>(ptr);
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auto stream = reinterpret_cast<sherpa_onnx::OnlineStream *>(stream_ptr);
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return kws->IsReady(stream);
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}
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SHERPA_ONNX_EXTERN_C
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JNIEXPORT jobjectArray JNICALL
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Java_com_k2fsa_sherpa_onnx_KeywordSpotter_getResult(JNIEnv *env,
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jobject /*obj*/, jlong ptr,
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jlong stream_ptr) {
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auto kws = reinterpret_cast<sherpa_onnx::KeywordSpotter *>(ptr);
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auto stream = reinterpret_cast<sherpa_onnx::OnlineStream *>(stream_ptr);
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sherpa_onnx::KeywordResult result = kws->GetResult(stream);
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// [0]: keyword, jstring
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// [1]: tokens, array of jstring
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// [2]: timestamps, array of float
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jobjectArray obj_arr = (jobjectArray)env->NewObjectArray(
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3, env->FindClass("java/lang/Object"), nullptr);
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jstring keyword = env->NewStringUTF(result.keyword.c_str());
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env->SetObjectArrayElement(obj_arr, 0, keyword);
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jobjectArray tokens_arr = (jobjectArray)env->NewObjectArray(
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result.tokens.size(), env->FindClass("java/lang/String"), nullptr);
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int32_t i = 0;
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for (const auto &t : result.tokens) {
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jstring jtext = env->NewStringUTF(t.c_str());
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env->SetObjectArrayElement(tokens_arr, i, jtext);
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i += 1;
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}
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env->SetObjectArrayElement(obj_arr, 1, tokens_arr);
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jfloatArray timestamps_arr = env->NewFloatArray(result.timestamps.size());
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env->SetFloatArrayRegion(timestamps_arr, 0, result.timestamps.size(),
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result.timestamps.data());
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env->SetObjectArrayElement(obj_arr, 2, timestamps_arr);
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return obj_arr;
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}
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