使用这个插件,我需要使用预渲染数据绘制音频波形。
我将 JSON 数据存储在 MySQL 中{"sample_rate":44100,"samples_per_pixel":4410,"bits":8,"length":2668,"data":[0.13,0.19,0.15,0.11,0.13,0.13,0.24,0.35 ...]}
所以我尝试了:
PHP
$json = $row['wave'];
$json_array = json_decode($json);
$json_wave = implode(',', $json_array->data);
HTML
<div data-track-wave="'.$json_wave.'" id="play'.$row['id'].'" class="track"></div>
JS
function createWaveform(json) {
$( "#waveformbottom" ).empty();
var linGrad = document.createElement('canvas').getContext('2d').createLinearGradient(0,0,0,170);
linGrad.addColorStop(0, '#ff3b25');
linGrad.addColorStop(0.5, '#ff0018');
var wavesurferbottom = WaveSurfer.create({
container: document.querySelector('#waveformbottom'),
waveColor: '#b3b3b3',
progressColor: linGrad,
backend: 'MediaElement',
mediaType:'audio',
height:'48',
cursorColor:'#fff',
cursorWidth:'0',
normalize:true,
barWidth:'2'
});
//Set peaks ! THE PROBLEM !
wavesurferbottom.backend.peaks = [json];
//Draw peaks
wavesurferbottom.drawBuffer();
$(window).resize(function(){
if($(this).width() != width){
widthbottom = $(this).width();
wavesurferbottom.drawer.containerWidth = wavesurferbottom.drawer.container.clientWidth;
wavesurferbottom.drawBuffer();
}
});
}
$(document).on('click touchend', '.track', function(e) {
var wave_data = $(this).data('track-wave');
createWaveform(json);
e.preventDefault();
});
我的节目调试wave_data
是正确的,0.01,0.13,0.19,0.15,0.11,...
但是没有绘制波形。
相反,如果我设置wavesurferbottom.backend.peaks = [0.01,0.13,0.19,0.15,0.11,...];
它有效。
我不是 JSON 专家,我做错了什么?