using global array to avoid creating every-time

dev
xufulong 3 years ago
parent bdfaea5592
commit 64dfc15806
  1. 10
      app/src/main/cpp/visualizer/frank_visualizer_jni.cpp

@ -19,6 +19,7 @@ struct fields_t {
jfieldID context;
jclass visual_class;
jmethodID fft_method;
jbyteArray data_array;
};
static fields_t fields;
@ -43,10 +44,8 @@ FrankVisualizer *getCustomVisualizer(JNIEnv *env, jobject thiz) {
}
void fft_callback(JNIEnv *jniEnv, int8_t * arg, int samples) {
jbyteArray dataArray = jniEnv->NewByteArray(samples);
jniEnv->SetByteArrayRegion(dataArray, 0, samples, arg);
jniEnv->CallStaticVoidMethod(fields.visual_class, fields.fft_method, dataArray);
jniEnv->DeleteLocalRef(dataArray);
jniEnv->SetByteArrayRegion(fields.data_array, 0, samples, arg);
jniEnv->CallStaticVoidMethod(fields.visual_class, fields.fft_method, fields.data_array);
}
VISUALIZER_FUNC(int, nativeInitVisualizer) {
@ -56,6 +55,8 @@ VISUALIZER_FUNC(int, nativeInitVisualizer) {
jclass mVisualClass = env->FindClass(className);
fields.visual_class = (jclass) env->NewGlobalRef(mVisualClass);
fields.fft_method = env->GetStaticMethodID(fields.visual_class, "onFftCallback", "([B)V");
jbyteArray dataArray = env->NewByteArray(MAX_FFT_SIZE);
fields.data_array = (jbyteArray) env->NewGlobalRef(dataArray);
return mVisualizer->init_visualizer();
}
@ -79,6 +80,7 @@ VISUALIZER_FUNC(void, nativeReleaseVisualizer) {
if (!mVisualizer) return;
mVisualizer->release_visualizer();
delete mVisualizer;
env->DeleteGlobalRef(fields.data_array);
env->DeleteGlobalRef(fields.visual_class);
env->SetLongField(thiz, fields.context, 0);
}
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