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[*] 混音算法

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acgist
2023-12-06 09:07:21 +08:00
parent 988746d708
commit 8d5e415850
3 changed files with 61 additions and 7 deletions
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35
taoyao-signal-server/taoyao-server/src/test/java/com/acgist/taoyao/AudioMixerTest.java
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@@ -2,6 +2,7 @@ package com.acgist.taoyao;
import java.io.File;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.file.Files;
import java.nio.file.Paths;
@@ -13,16 +14,40 @@ public class AudioMixerTest {
public void testMixer() throws IOException {
// ffmpeg -i audio.mp3 -f s32le audio.pcm
// ffplay -i audio.pcm -f s32le -ar 48000 -ac 1
final File fileA = new File("D:\\tmp\\mixer\\1.pcm");
final File fileB = new File("D:\\tmp\\mixer\\2.pcm");
final File fileA = new File("C:\\Users\\acgis\\桌面\\1.pcm");
final File fileB = new File("C:\\Users\\acgis\\桌面\\2.pcm");
final byte[] bytesA = Files.readAllBytes(fileA.toPath());
final byte[] bytesB = Files.readAllBytes(fileB.toPath());
final int length = Math.min(bytesA.length, bytesB.length);
final byte[] target = new byte[length];
for (int i = 0; i < length; i++) {
target[i] = (byte) (((bytesA[i] + bytesB[i]) & 0xFFFF) / 2);
final ByteBuffer buffer = ByteBuffer.allocateDirect(2);
for (int i = 0; i < length; i += 2) {
buffer.clear();
buffer.put(bytesA[i + 1]);
buffer.put(bytesA[i]);
buffer.flip();
int mixA = buffer.getShort();
buffer.flip();
buffer.put(bytesB[i + 1]);
buffer.put(bytesB[i]);
buffer.flip();
int mixB = buffer.getShort();
int mix = mixA + mixB;
if(mix > Short.MAX_VALUE) {
mix = Short.MAX_VALUE;
}
if(mix < Short.MIN_VALUE) {
mix = Short.MIN_VALUE;
}
// 不能使用下面这个
// mix = mix & 0xFFFF;
buffer.flip();
buffer.putShort((short) mix);
buffer.flip();
target[i + 1] = buffer.get();
target[i] = buffer.get();
}
Files.write(Paths.get("D:\\tmp\\mixer\\3.pcm"), target);
Files.write(Paths.get("C:\\Users\\acgis\\桌面\\3.pcm"), target);
}
}