change type from short to byte

app/src/main/cpp/audio_player.cpp

@@ -34,7 +34,7 @@ int filter_again = 0;
 int filter_release = 0;
 const char *filter_desc = "superequalizer=6b=4:8b=5:10b=5";
 
-void fft_callback(JNIEnv *jniEnv, jobject thiz, jmethodID fft_method, int16_t* arg, int samples);
+void fft_callback(JNIEnv *jniEnv, jobject thiz, jmethodID fft_method, int8_t* arg, int samples);
 
 int init_volume_filter(AVFilterGraph **graph, AVFilterContext **src, AVFilterContext **sink,
         uint64_t channel_layout, AVSampleFormat inputFormat, int sample_rate) {
@@ -283,7 +283,7 @@ AUDIO_PLAYER_FUNC(void, play, jstring input_jstr, jstring filter_jstr) {
 //        goto end;
     }
 
-    jmethodID fft_method = env->GetMethodID(player_class, "fftCallbackFromJNI", "([S)V");
+    jmethodID fft_method = env->GetMethodID(player_class, "fftCallbackFromJNI", "([B)V");
 
     auto *fft_filter = static_cast<filter_sys_t *>(malloc(sizeof(filter_sys_t)));
     init_visualizer(fft_filter);
@@ -377,9 +377,9 @@ AUDIO_PLAYER_FUNC(void, release) {
     filter_release = 1;
 }
 
-void fft_callback(JNIEnv *jniEnv, jobject thiz, jmethodID fft_method, int16_t * arg, int samples) {
-    jshortArray dataArray = jniEnv->NewShortArray(samples);
-    jniEnv->SetShortArrayRegion(dataArray, 0, samples, arg);
+void fft_callback(JNIEnv *jniEnv, jobject thiz, jmethodID fft_method, int8_t * arg, int samples) {
+    jbyteArray dataArray = jniEnv->NewByteArray(samples);
+    jniEnv->SetByteArrayRegion(dataArray, 0, samples, arg);
     jniEnv->CallVoidMethod(thiz, fft_method, dataArray);
     jniEnv->DeleteLocalRef(dataArray);
 }

app/src/main/cpp/visualizer/execute_fft.c

@@ -317,8 +317,10 @@ void fft_once(filter_sys_t *p_sys)
     fft_perform (p_buffer1, p_output, p_state);
 
     for (i = 0; i < out_samples; ++i) {
-        p_sys->output[i] = p_output[i] * (2 ^ 16)
+        int16_t temp = p_output[i] * (2 ^ 16)
                     / ((out_samples / 2 * 32768) ^ 2);
+
+        p_sys->output[i] = temp & 0xFF;
     }
 
 release:

app/src/main/cpp/visualizer/execute_fft.h

@@ -32,7 +32,7 @@ typedef struct
     uint8_t *data;
     int data_size;
     int nb_samples;
-    int16_t * output;
+    int8_t * output;
     int out_samples;
 } filter_sys_t;
 

app/src/main/java/com/frank/ffmpeg/AudioPlayer.java

@@ -63,14 +63,14 @@ public class AudioPlayer {
     private OnFFTCallback onFFTCallback;
 
     public interface OnFFTCallback {
-        void onFFT(short[] data);
+        void onFFT(byte[] data);
     }
 
     public void setOnFftCallback(OnFFTCallback onFFTCallback) {
         this.onFFTCallback = onFFTCallback;
     }
 
-    public void fftCallbackFromJNI(short[] data) {
+    public void fftCallbackFromJNI(byte[] data) {
         if (data != null && onFFTCallback != null) {
            onFFTCallback.onFFT(data);
         }

app/src/main/java/com/frank/ffmpeg/activity/EqualizerActivity.kt

@@ -34,12 +34,11 @@ class EqualizerActivity : BaseActivity(), OnSeeBarListener {
 
     private val selectBandList = IntArray(bandsList.size)
     private val minEQLevel = 0
-    private val fftData = ByteArray(256)
     private var filterThread: Thread? = null
     private var mAudioPlayer: AudioPlayer? = null
     private var visualizerView: VisualizerView? = null
     private var equalizerAdapter: EqualizerAdapter? = null
-    private var audioPath = Environment.getExternalStorageDirectory().path + "/know_play.mp3"
+    private var audioPath = Environment.getExternalStorageDirectory().path + "/boy.mp3"
 
     override val layoutId: Int
         get() = R.layout.activity_equalizer
@@ -93,10 +92,7 @@ class EqualizerActivity : BaseActivity(), OnSeeBarListener {
         mAudioPlayer = AudioPlayer()
         mAudioPlayer?.setOnFftCallback {
             if (visualizerView != null && it != null) {
-                for (i in it.indices) {
-                    fftData[i] = (it[i]).toByte()
-                }
-                visualizerView!!.post { visualizerView!!.setWaveData(fftData) }
+                visualizerView!!.post { visualizerView!!.setWaveData(it) }
             }
         }
     }