[*] 日常优化

taoyao-signal-server/taoyao-boot/src/main/java/com/acgist/taoyao/boot/utils/ErrorUtils.java

@@ -280,7 +280,7 @@ public final class ErrorUtils {
      * @return 首个参数
      */
     private static final String getFirstParams(Object ... params) {
-        for (Object object : params) {
+        for (final Object object : params) {
             if(object != null) {
                 return object.toString();
             }

taoyao-signal-server/taoyao-server/src/test/java/com/acgist/taoyao/AudioMixerTest.java

@@ -1,7 +1,9 @@
 package com.acgist.taoyao;
 
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.nio.ByteBuffer;
 import java.nio.file.Files;
 import java.nio.file.Paths;
@@ -50,4 +52,20 @@ public class AudioMixerTest {
         Files.write(Paths.get("C:\\Users\\acgis\\桌面\\3.pcm"), target);
     }
     
+    @Test
+    public void testStereoToMono() throws IOException {
+        final File file  = new File("C:\\Users\\acgis\\桌面\\src.pcm");
+        final File left  = new File("C:\\Users\\acgis\\桌面\\left.pcm");
+        final File right = new File("C:\\Users\\acgis\\桌面\\right.pcm");
+        final byte[] bytes = Files.readAllBytes(file.toPath());
+        final OutputStream leftOutput  = new FileOutputStream(left);
+        final OutputStream rightOutput = new FileOutputStream(right);
+        for (int index = 0; index < bytes.length; index += 4) {
+            leftOutput.write( new byte[] {bytes[index],     bytes[index + 1]});
+            rightOutput.write(new byte[] {bytes[index + 2], bytes[index + 3]});
+        }
+        leftOutput.close();
+        rightOutput.close();
+    }
+    
 }