增加pcm转工具

lame_lib/src/main/java/com/buihha/audiorecorder/ConvertUtil.java

@@ -0,0 +1,57 @@
+package com.buihha.audiorecorder;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+public class ConvertUtil {
+    public static void pcm2Mp3(String pcmPath,String mp3Path,int sampleRate,int channels){
+       pcm2Mp3(pcmPath, mp3Path, sampleRate, channels,96,6);
+    }
+    public static void pcm2Mp3(String pcmPath,String mp3Path,int sampleRate,int channels,int outBitrate,int quality){
+        SimpleLame.init(sampleRate,channels,sampleRate,outBitrate,quality);
+        FileInputStream fis=null;
+        FileOutputStream fos=null;
+        byte[] bufferSize=new byte[1024];
+        try {
+           fis=new FileInputStream(pcmPath);
+           fos=new FileOutputStream(mp3Path);
+           int size=0;
+           short[] shortArr;
+           byte[] mp3Buffer=new byte[(int) (7200 + bufferSize.length * 2 * 1.25)];
+           while (true){
+               size=fis.read(bufferSize);
+               shortArr=new short[size/2];
+               if (size>0){
+                   ByteBuffer.wrap(bufferSize).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shortArr);
+                   int encodedSize= SimpleLame.encode(shortArr,shortArr,shortArr.length,mp3Buffer);
+                   if (encodedSize>0){
+                       fos.write(mp3Buffer,0,encodedSize);
+                   }
+               }else {
+                   SimpleLame.flush(mp3Buffer);
+                   fos.write(mp3Buffer);
+                   break;
+               }
+           }
+
+        }catch (Exception e){}
+        finally {
+            try {
+                if (fis!=null){
+                    fis.close();
+                    fis=null;
+                }
+                if (fos!=null){
+                    fos.close();
+                    fos=null;
+                }
+                SimpleLame.close();
+            }catch (Exception e){
+
+            }
+
+        }
+    }
+}