java根据时间切割音频

迈不过友情╰ 2022-05-10 18:12 229阅读 0赞

import it.sauronsoftware.jave.Encoder;
    import it.sauronsoftware.jave.EncoderException;
    import it.sauronsoftware.jave.MultimediaInfo;
    
    
    import java.io.*;
    import java.nio.ByteBuffer;
    
    /**
     * FileName: WavCut
     * Author:   xuan zongjun
     * Date:     2018/10/18 10:45
     * Description: wav视频切割
     */
    
    
    public class WavCut {
        /**
         * @param sourcefile
         * @param targetfile
         * @param start
         * @param end
         * @return
         */
        public static boolean cut(String sourcefile, String targetfile, int start, int end) {
            try {
                if (!sourcefile.toLowerCase().endsWith( ".wav" ) || !targetfile.toLowerCase().endsWith( ".wav" )) {
                    return false;
                }
                File wav = new File( sourcefile );
                if (!wav.exists()) {
                    return false;
                }
                long t1 = getTimeLen( wav );  //总时长(秒)
                if (start < 0 || end <= 0 || start >= t1 || end > t1 || start >= end) {
                    return false;
                }
                FileInputStream fis = new FileInputStream( wav );
                long wavSize = wav.length() - 44;  //音频数据大小（44为128kbps比特率wav文件头长度）
                long splitSize = (wavSize / t1) * (end - start);  //截取的音频数据大小
                long skipSize = (wavSize / t1) * start;  //截取时跳过的音频数据大小
                int splitSizeInt = Integer.parseInt( String.valueOf( splitSize ) );
                int skipSizeInt = Integer.parseInt( String.valueOf( skipSize ) );
    
                ByteBuffer buf1 = ByteBuffer.allocate( 4 );  //存放文件大小,4代表一个int占用字节数
                buf1.putInt( splitSizeInt + 36 );  //放入文件长度信息
                byte[] flen = buf1.array();  //代表文件长度
                ByteBuffer buf2 = ByteBuffer.allocate( 4 );  //存放音频数据大小，4代表一个int占用字节数
                buf2.putInt( splitSizeInt );  //放入数据长度信息
                byte[] dlen = buf2.array();  //代表数据长度
                flen = reverse( flen );  //数组反转
                dlen = reverse( dlen );
                byte[] head = new byte[44];  //定义wav头部信息数组
                fis.read( head, 0, head.length );  //读取源wav文件头部信息
                for (int i = 0; i < 4; i++) {  //4代表一个int占用字节数
                    head[i + 4] = flen[i];  //替换原头部信息里的文件长度
                    head[i + 40] = dlen[i];  //替换原头部信息里的数据长度
                }
                byte[] fbyte = new byte[splitSizeInt + head.length];  //存放截取的音频数据
                for (int i = 0; i < head.length; i++) {  //放入修改后的头部信息
                    fbyte[i] = head[i];
                }
                byte[] skipBytes = new byte[skipSizeInt];  //存放截取时跳过的音频数据
                fis.read( skipBytes, 0, skipBytes.length );  //跳过不需要截取的数据
                fis.read( fbyte, head.length, fbyte.length - head.length );  //读取要截取的数据到目标数组
                fis.close();
    
                File target = new File( targetfile );
                if (target.exists()) {  //如果目标文件已存在，则删除目标文件
                    target.delete();
                }
                FileOutputStream fos = new FileOutputStream( target );
                fos.write( fbyte );
                fos.flush();
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
            return true;
        }
    
    
        public static long getTimeLen(File file) {
            long tlen = 0;
            if (file != null && file.exists()) {
                Encoder encoder = new Encoder();
                try {
                    MultimediaInfo m = encoder.getInfo( file );
                    long ls = m.getDuration();
                    tlen = ls / 1000;
    
                } catch (Exception e) {
                    e.printStackTrace();
                }
    
            }
            return tlen;
        }
    
        public static byte[] reverse(byte[] array) {
            byte temp;
            int len = array.length;
            for (int i = 0; i < len / 2; i++) {
                temp = array[i];
                array[i] = array[len - 1 - i];
                array[len - 1 - i] = temp;
            }
            return array;
        }

public static void main(String[] args) {
        String fileName ="D:\\wav\\pcmpcmpcm.wav";
        String targetName1 ="D:\\wav2\\pcmpcmpcm1.wav";
        String targetName2 ="D:\\wav2\\pcmpcmpcm2.wav";
    
        boolean result1 =  cut(fileName,targetName1,0,5);
        boolean result3 = cut(fileName,targetName2,5,9);
        System.out.println(result1);
        System.out.println(result3);
    }