Java微信开发上传下载语音怎么获取amr语音的秒数，传给APP端

Question

微信端发语音，微信显示语音的秒数，微信接收到语音也能显示秒数，怎么获得这个秒数？
查了很多资料例子 amr获取时长的例子，运行得到的与真实的秒数不符合：
用的方法是下面的：
public static int 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 (int)((duration/1000)+1);
}

Answer 1

http://blog.csdn.net/soul_code/article/details/51654870