var context = new AudioContext(),通过decodeAudioData获得声道数据并倒序一下即可
request = new XMLHttpRequest();
request.open('GET', 'path/to/audio.mp3', true);
request.responseType = 'arraybuffer';
request.addEventListener('load', function(){
context.decodeAudioData(request.response, function(buffer){
var source = context.createBufferSource();
Array.prototype.reverse.call( buffer.getChannelData(0) );
Array.prototype.reverse.call( buffer.getChannelData(1) );
source.buffer = buffer;
});
});
完整可在线运行示例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
</head>
<body>
<div>
<aBfwOnclick="play()">原版播放</a>
<aBfwOnclick="playreverse()">倒序播放</a>
</div>
<script type="text/javascript">
function playreverse(){
var context = new AudioContext(),
request = new XMLHttpRequest();
request.open('GET', '/asset/testsound.mp3', true);
request.responseType = 'arraybuffer';
request.addEventListener('load', function(){
context.decodeAudioData(request.response, function(buffer){
var source = context.createBufferSource();
Array.prototype.reverse.call( buffer.getChannelData(0) );
Array.prototype.reverse.call( buffer.getChannelData(1) );
source.buffer = buffer;
console.log(buffer);
source.connect(context.destination);
source.start(0); //立即播放
});
});
request.send();
}
function play(){
var context = new AudioContext(),
request = new XMLHttpRequest();
request.open('GET', '/asset/testsound.mp3', true);
request.responseType = 'arraybuffer';
request.addEventListener('load', function(){
context.decodeAudioData(request.response, function(buffer){
var source = context.createBufferSource();
source.buffer = buffer;
console.log(buffer);
source.connect(context.destination);
source.start(0); //立即播放
});
});
request.send();
}
</script>
</body>
</html>
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