jni.cc
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// sherpa-onnx/jni/jni.cc
//
// Copyright (c) 2022-2023 Xiaomi Corporation
// 2022 Pingfeng Luo
// 2023 Zhaoming
#include <fstream>
#include "sherpa-onnx/csrc/macros.h"
#include "sherpa-onnx/csrc/onnx-utils.h"
#include "sherpa-onnx/csrc/wave-reader.h"
#include "sherpa-onnx/csrc/wave-writer.h"
#include "sherpa-onnx/jni/common.h"
// see
// https://stackoverflow.com/questions/29043872/android-jni-return-multiple-variables
jobject NewInteger(JNIEnv *env, int32_t value) {
jclass cls = env->FindClass("java/lang/Integer");
jmethodID constructor = env->GetMethodID(cls, "<init>", "(I)V");
return env->NewObject(cls, constructor, value);
}
jobject NewFloat(JNIEnv *env, float value) {
jclass cls = env->FindClass("java/lang/Float");
jmethodID constructor = env->GetMethodID(cls, "<init>", "(F)V");
return env->NewObject(cls, constructor, value);
}
SHERPA_ONNX_EXTERN_C
JNIEXPORT jboolean JNICALL Java_com_k2fsa_sherpa_onnx_GeneratedAudio_saveImpl(
JNIEnv *env, jobject /*obj*/, jstring filename, jfloatArray samples,
jint sample_rate) {
const char *p_filename = env->GetStringUTFChars(filename, nullptr);
jfloat *p = env->GetFloatArrayElements(samples, nullptr);
jsize n = env->GetArrayLength(samples);
bool ok = sherpa_onnx::WriteWave(p_filename, sample_rate, p, n);
env->ReleaseStringUTFChars(filename, p_filename);
env->ReleaseFloatArrayElements(samples, p, JNI_ABORT);
return ok;
}
static jobjectArray ReadWaveImpl(JNIEnv *env, std::istream &is,
const char *p_filename) {
bool is_ok = false;
int32_t sampling_rate = -1;
std::vector<float> samples =
sherpa_onnx::ReadWave(is, &sampling_rate, &is_ok);
if (!is_ok) {
SHERPA_ONNX_LOGE("Failed to read %s", p_filename);
exit(-1);
}
jfloatArray samples_arr = env->NewFloatArray(samples.size());
env->SetFloatArrayRegion(samples_arr, 0, samples.size(), samples.data());
jobjectArray obj_arr = (jobjectArray)env->NewObjectArray(
2, env->FindClass("java/lang/Object"), nullptr);
env->SetObjectArrayElement(obj_arr, 0, samples_arr);
env->SetObjectArrayElement(obj_arr, 1, NewInteger(env, sampling_rate));
return obj_arr;
}
SHERPA_ONNX_EXTERN_C
JNIEXPORT jobjectArray JNICALL
Java_com_k2fsa_sherpa_onnx_WaveReader_00024Companion_readWaveFromFile(
JNIEnv *env, jclass /*cls*/, jstring filename) {
const char *p_filename = env->GetStringUTFChars(filename, nullptr);
std::ifstream is(p_filename, std::ios::binary);
auto obj_arr = ReadWaveImpl(env, is, p_filename);
env->ReleaseStringUTFChars(filename, p_filename);
return obj_arr;
}
SHERPA_ONNX_EXTERN_C
JNIEXPORT jobjectArray JNICALL
Java_com_k2fsa_sherpa_onnx_WaveReader_00024Companion_readWaveFromAsset(
JNIEnv *env, jclass /*cls*/, jobject asset_manager, jstring filename) {
const char *p_filename = env->GetStringUTFChars(filename, nullptr);
#if __ANDROID_API__ >= 9
AAssetManager *mgr = AAssetManager_fromJava(env, asset_manager);
if (!mgr) {
SHERPA_ONNX_LOGE("Failed to get asset manager: %p", mgr);
exit(-1);
}
std::vector<char> buffer = sherpa_onnx::ReadFile(mgr, p_filename);
std::istrstream is(buffer.data(), buffer.size());
#else
std::ifstream is(p_filename, std::ios::binary);
#endif
auto obj_arr = ReadWaveImpl(env, is, p_filename);
env->ReleaseStringUTFChars(filename, p_filename);
return obj_arr;
}
#if 0
SHERPA_ONNX_EXTERN_C
JNIEXPORT void JNICALL
Java_com_k2fsa_sherpa_onnx_OnlineRecognizer_decodeStreams(JNIEnv *env,
jobject /*obj*/,
jlong ptr,
jlongArray ss_ptr,
jint stream_size) {
sherpa_onnx::OnlineRecognizer *model =
reinterpret_cast<sherpa_onnx::OnlineRecognizer *>(ptr);
jlong *p = env->GetLongArrayElements(ss_ptr, nullptr);
jsize n = env->GetArrayLength(ss_ptr);
std::vector<sherpa_onnx::OnlineStream *> p_ss(n);
for (int32_t i = 0; i != n; ++i) {
p_ss[i] = reinterpret_cast<sherpa_onnx::OnlineStream *>(p[i]);
}
model->DecodeStreams(p_ss.data(), n);
env->ReleaseLongArrayElements(ss_ptr, p, JNI_ABORT);
}
#endif