1. 获取.amr音频文件播放时长

import java.io.File;

import java.io.IOException;

import java.io.RandomAccessFile;

public class AmrFileTimeLengthSample {

public static long getAmrDuration(File file) throws IOException {

long duration = -1;

int[] packedSize = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };

RandomAccessFile randomAccessFile = null;

try {

randomAccessFile = new RandomAccessFile(file, "rw");

long length = file.length();//文件的长度

int pos = 6;//设置初始位置

int frameCount = 0;//初始帧数

int packedPos = -1;

byte[] datas = new byte[1];//初始数据值

while (pos <= length) {

randomAccessFile.seek(pos);

if (randomAccessFile.read(datas, 0, 1) != 1) {

duration = length > 0 ? ((length - 6) / 650) : 0;

break;

}

packedPos = (datas[0] >> 3) & 0x0F;

pos += packedSize[packedPos] + 1;

frameCount++;

}

duration += frameCount * 20;//帧数*20

} finally {

if (randomAccessFile != null) {

randomAccessFile.close();

}

}

return duration;

}

}

2. 获取.mp3，.wav，.wma音频文件播放时长

import it.sauronsoftware.jave.Encoder;

import it.sauronsoftware.jave.MultimediaInfo;

import java.io.File;

.................................

File source = new File(fileUrl);

Encoder encoder = new Encoder();

MultimediaInfo m = encoder.getInfo(source);

long duration = m.getDuration();