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RNSaveAudioModule.java
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RNSaveAudioModule.java
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package com.navraj.rnsaveaudio;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReadableArray;
import com.facebook.react.bridge.ReadableType;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.DataOutputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.io.IOException;
import java.lang.String;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
public class RNSaveAudioModule extends ReactContextBaseJavaModule {
public RNSaveAudioModule(ReactApplicationContext reactContext) {
super(reactContext);
}
@Override
public String getName() {
return "RNSaveAudio";
}
@ReactMethod
public void saveWav(String path, ReadableArray audio, final Promise promise){
try {
short[] newaudio = new short[audio.size()];
for(int i=0; i<audio.size();i++){
newaudio[i] = (short) (audio.getInt(i) & 0xFFFF);
}
boolean result = SaveFile(path, newaudio);
promise.resolve(result);
} catch (Exception ex) {
promise.reject("ERR_UNEXPECTED_EXCEPTION", ex);
}
}
private boolean SaveFile(String path, short[] rawData) throws Exception{
DataOutputStream output = null;
boolean ret = true;
byte[] data = get16BitPcm(rawData);
try {
output = new DataOutputStream(new FileOutputStream(path));
// WAVE header
// see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/
writeString(output, "RIFF"); // chunk id
writeInt(output, 36 + data.length); // chunk size
writeString(output, "WAVE"); // format
writeString(output, "fmt "); // subchunk 1 id
writeInt(output, 16); // subchunk 1 size
writeShort(output, (short) 1); // audio format (1 = PCM)
writeShort(output, (short) 1); // number of channels
writeInt(output, 44100); // sample rate
writeInt(output, 44100 * 2); // byte rate
writeShort(output, (short) 2); // block align
writeShort(output, (short) 16); // bits per sample
writeString(output, "data"); // subchunk 2 id
writeInt(output, data.length); // subchunk 2 size
// Audio data (conversion big endian -> little endian)
ByteBuffer buffer = ByteBuffer.allocate(2*rawData.length);
buffer.order(ByteOrder.LITTLE_ENDIAN);
for(short i: rawData){
buffer.putShort(i);
}
byte[] bytes = buffer.array();
output.write(bytes);
} catch (Exception err) {
return ret;
} finally {
if (output != null) {
output.close();
ret = false;
}
return ret;
}
}
private byte[] short2byte(short[] sData) {
int shortArrsize = sData.length;
byte[] bytes = new byte[shortArrsize * 2];
for (int i = 0; i < shortArrsize; i++) {
bytes[i * 2] = (byte) (sData[i] & 0x00FF);
bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
sData[i] = 0;
}
return bytes;
}
private byte[] get16BitPcm(short[] data) {
byte[] resultData = new byte[2 * data.length];
int iter = 0;
for (double sample : data) {
short maxSample = (short)((sample * Short.MAX_VALUE));
resultData[iter++] = (byte)(maxSample & 0x00ff);
resultData[iter++] = (byte)((maxSample & 0xff00) >>> 8);
}
return resultData;
}
private void writeInt(final DataOutputStream output, final int value) throws IOException {
output.write(value >> 0);
output.write(value >> 8);
output.write(value >> 16);
output.write(value >> 24);
}
private void writeShort(final DataOutputStream output, final short value) throws IOException {
output.write(value >> 0);
output.write(value >> 8);
}
private void writeString(final DataOutputStream output, final String value) throws IOException {
for (int i = 0; i < value.length(); i++) {
output.write(value.charAt(i));
}
}
}