Javascript 如何在react js中向用户发送可下载链接
我正试图让它成为一个用户可以上传一个文件到网站,并转换他们的文件。然后下载回来。我使用JavaScriptsWebAudioAPI来实现这一点。现在我只需要让用户下载文件回来。我创建了一个blob,但我当前被卡住了 ConverterSec2.jsx:Javascript 如何在react js中向用户发送可下载链接,javascript,reactjs,Javascript,Reactjs,我正试图让它成为一个用户可以上传一个文件到网站,并转换他们的文件。然后下载回来。我使用JavaScriptsWebAudioAPI来实现这一点。现在我只需要让用户下载文件回来。我创建了一个blob,但我当前被卡住了 ConverterSec2.jsx: class ConverterSec2 extends Component { render() { return ( <div className="sec2">
class ConverterSec2 extends Component {
render() {
return (
<div className="sec2">
<form>
<input type="file" id="audio-file" name="file" accept="audio/mpeg, audio/ogg, audio/*" />
<button type="Submit" id="convert_btn">Convert to 432Hz</button>
<script src="ihertz_website/src/pages/Converter/compressor.js"></script>
</form>
</div>
)
}
类转换器SEC2扩展组件{
render(){
返回(
转换为432Hz
)
}
}
导出默认转换器EC2
转换.js:
//render proccessed audio
offlineAudioCtx.startRendering().then(function(renderBuffer){
make_download(renderBuffer, offlineAudioCtx.length)
console.log("ERROR: PROCCESSING AUDIO")
})
//download Audio buffer as downloadable WAV file
function make_download(abuffer, total_samples) {
//get duration and sample rate
var duration = abuffer.duration,
rate = abuffer.sampleRate,
offset = 0;
var new_file = URL.createObjectURL(bufferToWave(abuffer, total_samples));
var download_link = document.getElementById("download_link");
download_link.href = new_file;
var name = generateFileName();
download_link.download = name;
}
//generate name of file
function generateFileName() {
var origin_name = fileInput.files[0].name;
var pos = origin_name.lastIndexOf('.');
var no_exit = origin_name.slice(0, pos);
return no_exit + ".wav";
}
//Convert an AudioBuffer to a Blob using WAVE representation
function bufferToWave(abuffer, len) {
var numOfChan = abuffer.numberOfChannels,
length = len * numOfChan * 2 + 44,
buffer = new ArrayBuffer(length),
view = new DataView(buffer),
channels = [], i, sample,
offset = 0,
pos = 0;
//write WAVE header
setUnit32(0x464664952);
setUnit32(length - 8);
setUint32(0x45564157); // "WAVE"
setUint32(0x20746d66); // "fmt " chunk
setUint32(16); // length = 16
setUint16(1); // PCM (uncompressed)
setUint16(numOfChan);
setUint32(abuffer.sampleRate);
setUint32(abuffer.sampleRate * 2 * numOfChan); // avg. bytes/sec
setUint16(numOfChan * 2); // block-align
setUint16(16); // 16-bit (hardcoded in this demo)
setUint32(0x61746164); // "data" - chunk
setUint32(length - pos - 4); // chunk length
// write interleaved data
for(i = 0; i < abuffer.numberOfChannels; i++)
channels.push(abuffer.getChannelData(i));
while(pos < length) {
for(i = 0; i < numOfChan; i++) { // interleave channels
sample = Math.max(-1, Math.min(1, channels[i][offset])); // clamp
sample = (0.5 + sample < 0 ? sample * 32768 : sample * 32767)|0; // scale to 16-bit signed int
view.setInt16(pos, sample, true); // write 16-bit sample
pos += 2;
}
offset++ // next source sample
}
//create Blob
return new Blob([buffer], {type: "audio/wav"});
function setUint16(data) {
view.setUint16(pos, data, true);
pos += 2;
}
function setUnit32(data) {
view.setUint32(pos, data, true);
pos += 4;
}
//呈现已处理的音频
OfflineAudioCx.startRendering().then(函数(renderBuffer){
制作下载(renderBuffer,offlineAudioCtx.length)
日志(“错误:处理音频”)
})
//下载音频缓冲区作为可下载的WAV文件
函数make_下载(abuffer,总样本){
//获取持续时间和采样率
var持续时间=一段持续时间,
速率=采样率,
偏移量=0;
var new_file=URL.createObjectURL(bufferToWave(abuffer,total_samples));
var download_link=document.getElementById(“download_link”);
下载_link.href=新的_文件;
var name=generateFileName();
download_link.download=名称;
}
//生成文件名
函数generateFileName(){
var origin_name=fileInput.files[0].name;
var pos=来源名称.lastIndexOf('.');
var no_exit=原点名称.slice(0,位置);
返回no_exit+“.wav”;
}
//使用波形表示法将音频缓冲区转换为Blob
函数bufferToWave(abuffer,len){
var numochan=abuffer.numberOfChannels,
长度=len*numOfChan*2+44,
缓冲区=新阵列缓冲区(长度),
视图=新数据视图(缓冲区),
通道=[],i,样本,
偏移量=0,
pos=0;
//写波头
setUnit32(0x4664952);
setUnit32(长度-8);
setUint32(0x45564157);/“波”
setUint32(0x20746d66);/“fmt”块
setUint32(16);//长度=16
setUint16(1);//PCM(未压缩)
setUint16(numOfChan);
setUint32(一种取样器);
setUint32(abuffer.sampleRate*2*numochan);//平均字节/秒
setUint16(numochan*2);//块对齐
setUint16(16);//16位(在本演示中硬编码)
setUint32(0x61746164);/“数据”-块
setUint32(长度-pos-4);//块长度
//写交错数据
对于(i=0;i
}这可能回答了您的问题:或者这是否回答了您的问题?