要将两个 byte 数组与 16 位声音样本混合，您应该首先将这些数组转换为 int 数组，即基于样本的数组，然后将它们相加（以混合），然后再转换回字节数组。从byte 数组转换为int 数组时，需要确保使用正确的endianness (byte order)。
这里有一些代码可以让您混合两个数组。最后有一些示例代码（使用正弦波）演示了该方法。请注意，这可能不是编码的理想方式，而是演示该概念的工作示例。使用流或线，因为Phil recommends 可能是更聪明的整体方法。
祝你好运！
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
public class MixDemo {
public static byte[] mix(final byte[] a, final byte[] b, final boolean bigEndian) {
final byte[] aa;
final byte[] bb;
final int length = Math.max(a.length, b.length);
// ensure same lengths
if (a.length != b.length) {
aa = new byte[length];
bb = new byte[length];
System.arraycopy(a, 0, aa, 0, a.length);
System.arraycopy(b, 0, bb, 0, b.length);
} else {
aa = a;
bb = b;
}
// convert to samples
final int[] aSamples = toSamples(aa, bigEndian);
final int[] bSamples = toSamples(bb, bigEndian);
// mix by adding
final int[] mix = new int[aSamples.length];
for (int i=0; i<mix.length; i++) {
mix[i] = aSamples[i] + bSamples[i];
// enforce min and max (may introduce clipping)
mix[i] = Math.min(Short.MAX_VALUE, mix[i]);
mix[i] = Math.max(Short.MIN_VALUE, mix[i]);
}
// convert back to bytes
return toBytes(mix, bigEndian);
}
private static int[] toSamples(final byte[] byteSamples, final boolean bigEndian) {
final int bytesPerChannel = 2;
final int length = byteSamples.length / bytesPerChannel;
if ((length % 2) != 0) throw new IllegalArgumentException("For 16 bit audio, length must be even: " + length);
final int[] samples = new int[length];
for (int sampleNumber = 0; sampleNumber < length; sampleNumber++) {
final int sampleOffset = sampleNumber * bytesPerChannel;
final int sample = bigEndian
? byteToIntBigEndian(byteSamples, sampleOffset, bytesPerChannel)
: byteToIntLittleEndian(byteSamples, sampleOffset, bytesPerChannel);
samples[sampleNumber] = sample;
}
return samples;
}
private static byte[] toBytes(final int[] intSamples, final boolean bigEndian) {
final int bytesPerChannel = 2;
final int length = intSamples.length * bytesPerChannel;
final byte[] bytes = new byte[length];
for (int sampleNumber = 0; sampleNumber < intSamples.length; sampleNumber++) {
final byte[] b = bigEndian
? intToByteBigEndian(intSamples[sampleNumber], bytesPerChannel)
: intToByteLittleEndian(intSamples[sampleNumber], bytesPerChannel);
System.arraycopy(b, 0, bytes, sampleNumber * bytesPerChannel, bytesPerChannel);
}
return bytes;
}
// from https://github.com/hendriks73/jipes/blob/master/src/main/java/com/tagtraum/jipes/audio/AudioSignalSource.java#L238
private static int byteToIntLittleEndian(final byte[] buf, final int offset, final int bytesPerSample) {
int sample = 0;
for (int byteIndex = 0; byteIndex < bytesPerSample; byteIndex++) {
final int aByte = buf[offset + byteIndex] & 0xff;
sample += aByte << 8 * (byteIndex);
}
return (short)sample;
}
// from https://github.com/hendriks73/jipes/blob/master/src/main/java/com/tagtraum/jipes/audio/AudioSignalSource.java#L247
private static int byteToIntBigEndian(final byte[] buf, final int offset, final int bytesPerSample) {
int sample = 0;
for (int byteIndex = 0; byteIndex < bytesPerSample; byteIndex++) {
final int aByte = buf[offset + byteIndex] & 0xff;
sample += aByte << (8 * (bytesPerSample - byteIndex - 1));
}
return (short)sample;
}
private static byte[] intToByteLittleEndian(final int sample, final int bytesPerSample) {
byte[] buf = new byte[bytesPerSample];
for (int byteIndex = 0; byteIndex < bytesPerSample; byteIndex++) {
buf[byteIndex] = (byte)((sample >>> (8 * byteIndex)) & 0xFF);
}
return buf;
}
private static byte[] intToByteBigEndian(final int sample, final int bytesPerSample) {
byte[] buf = new byte[bytesPerSample];
for (int byteIndex = 0; byteIndex < bytesPerSample; byteIndex++) {
buf[byteIndex] = (byte)((sample >>> (8 * (bytesPerSample - byteIndex - 1))) & 0xFF);
}
return buf;
}
public static void main(final String[] args) throws IOException {
final int sampleRate = 44100;
final boolean bigEndian = true;
final int sampleSizeInBits = 16;
final int channels = 1;
final boolean signed = true;
final AudioFormat targetAudioFormat = new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
final byte[] a = new byte[sampleRate * 10];
final byte[] b = new byte[sampleRate * 5];
// create sine waves
for (int i=0; i<a.length/2; i++) {
System.arraycopy(intToByteBigEndian((int)(30000*Math.sin(i*0.5)),2), 0, a, i*2, 2);
}
for (int i=0; i<b.length/2; i++) {
System.arraycopy(intToByteBigEndian((int)(30000*Math.sin(i*0.1)),2), 0, b, i*2, 2);
}
final File aFile = new File("a.wav");
AudioSystem.write(new AudioInputStream(new ByteArrayInputStream(a), targetAudioFormat, a.length),
AudioFileFormat.Type.WAVE, aFile);
final File bFile = new File("b.wav");
AudioSystem.write(new AudioInputStream(new ByteArrayInputStream(b), targetAudioFormat, b.length),
AudioFileFormat.Type.WAVE, bFile);
// mix a and b
final byte[] mixed = mix(a, b, bigEndian);
final File outFile = new File("out.wav");
AudioSystem.write(new AudioInputStream(new ByteArrayInputStream(mixed), targetAudioFormat, mixed.length),
AudioFileFormat.Type.WAVE, outFile);
}
}