/**
* 慢速播放( 音调正常 )
* @param ais
* @param player
* @param playSamples 连续播放的采样数
* @param fillSamples 连续填充的采样数
* @throws IOException
*/
private static void handleCase2_slow_normal(AudioInputStream ais, SourceDataLine player,int playSamples,int fillSamples ) throws IOException {
System.out.println( "case2:" );
System.out.println( "playSamples = " + playSamples + ",fillSamples = " + fillSamples );
int len;
byte[] buf = new byte[4];
int i=0;
long t = System.currentTimeMillis();
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
while((len=ais.read(buf))!=-1) {
i++;
if( i < 2152526 ){
continue;
}
if( i >= 3360000 ){
break;
}
// 实现变慢,但是调不变粗
//左声道
buf[1] = ( byte ) ( buf[1] );
//右声道
buf[3] = ( byte ) ( buf[3] );
player.write(buf, 0, len);
if( i % playSamples == 0 ){
for( int j=0;j<fillSamples;j++ ){
//左声道
buf[1] = 0;
//右声道
buf[3] = 0;
player.write(buf, 0, len);
}
}
}
}
原理也是通过填充0采样来将播放速度变慢,为了让音色不变沉闷,是连续播放一小段采样、再连续填充一小段采样