是否可以将多个音频文件混合在一起，最好是用javascript [英] Is it possible to mix multiple audio files on top of each other preferably with javascript
问题描述
我希望将音频剪辑组合在一起，相互叠加，以便它们同步播放并保存在新的音频文件中。任何帮助将非常感激。我已经在线进行了一些挖掘工作，但是无法找到关于Javascript音频编辑库（例如）的许多工具是否可用的确切答案。
I want to combine audio clips, layered on top of each other so that they play synchronously and are saved in a new audio file. Any help would be much appreciated. I've done some digging online, but couldn't find a definitive answer as to whether or not many of the tools available as far as Javascript audio editing librarys go (Mix.js for example) are capable.
推荐答案
是的，可以使用 OfflineAudioContext（） 或 AudioContext.createChannelMerger（）并创建a MediaStream 。请参阅手机混音音频文件， Web Audio API 。
Yes, it is possible using OfflineAudioContext() or AudioContext.createChannelMerger() and creating a MediaStream. See Phonegap mixing audio files , Web Audio API.
您可以使用 fetch（） 或 XMLHttpRequest（）以 ArrayBuffer ，检索音频资源> AudioContext.decodeAudioData（）从响应中创建 AudioBufferSourceNode ; OfflineAudioContext（）用于呈现合并音频， AudioContext ， AudioContext.createBufferSource（）， AudioContext.createMediaStreamDestination（）， MediaRecorder（）来记录流; Promise.all（）， Promise（）构造函数， .then（）处理异步请求到 fetch（）， AudioContext.decodeAudioData（），传递结果混合音频 Blob at stop MediaRecorder 的事件。
You can use fetch() or XMLHttpRequest() to retrieve audio resource as an ArrayBuffer, AudioContext.decodeAudioData() to create an AudioBufferSourceNode from response; OfflineAudioContext() to render merged audio, AudioContext, AudioContext.createBufferSource(), AudioContext.createMediaStreamDestination() , MediaRecorder() to record stream; Promise.all(), Promise() constructor, .then() to process asynchronous requests to fetch(), AudioContext.decodeAudioData(), pass resulting mixed audio Blob at stop event of MediaRecorder.
将每个 AudioContext AudioBufferSourceNode 连接到 OfflineAudioContext.destination ，在每个节点上调用 .start（）;调用 OfflineAudioContext.startRendering（）;创建新的 AudioContext 节点，连接 renderedBuffer ;在 AudioContext 上调用 .createMediaStreamDestination（）来创建 MediaStream 来自合并的音频缓冲区，将 .stream 传递给 MediaRecorder（），在停止事件 MediaRecorder ，创建 Blob URL Blob 录制的音频混合 URL.createObjectURL（），可以使用< a> 元素下载下载属性和 href 设置为 Blob URL 。
Connect each AudioContext AudioBufferSourceNode to OfflineAudioContext.destination, call .start() on each node; call OfflineAudioContext.startRendering(); create new AudioContext node, connect renderedBuffer; call .createMediaStreamDestination() on AudioContext to create a MediaStream from merged audio buffers, pass .stream to MediaRecorder(), at stop event of MediaRecorder, create Blob URL of Blob of recorded audio mix with URL.createObjectURL(), which can be downloaded using <a> element with download attribute and href set to Blob URL.
var sources = ["https://upload.wikimedia.org/wikipedia/commons/b/be/"
+ "Hidden_Tribe_-_Didgeridoo_1_Live.ogg"
, "https://upload.wikimedia.org/wikipedia/commons/6/6e/"
+ "Micronesia_National_Anthem.ogg"];
var description = "HiddenTribeAnthem";
var context;
var recorder;
var div = document.querySelector("div");
var duration = 60000;
var chunks = [];
var audio = new AudioContext();
var mixedAudio = audio.createMediaStreamDestination();
var player = new Audio();
player.controls = "controls";
function get(src) {
return fetch(src)
.then(function(response) {
return response.arrayBuffer()
})
}
function stopMix(duration, ...media) {
setTimeout(function(media) {
media.forEach(function(node) {
node.stop()
})
}, duration, media)
}
Promise.all(sources.map(get)).then(function(data) {
var len = Math.max.apply(Math, data.map(function(buffer) {
return buffer.byteLength
}));
context = new OfflineAudioContext(2, len, 44100);
return Promise.all(data.map(function(buffer) {
return audio.decodeAudioData(buffer)
.then(function(bufferSource) {
var source = context.createBufferSource();
source.buffer = bufferSource;
source.connect(context.destination);
return source.start()
})
}))
.then(function() {
return context.startRendering()
})
.then(function(renderedBuffer) {
return new Promise(function(resolve) {
var mix = audio.createBufferSource();
mix.buffer = renderedBuffer;
mix.connect(audio.destination);
mix.connect(mixedAudio);
recorder = new MediaRecorder(mixedAudio.stream);
recorder.start(0);
mix.start(0);
div.innerHTML = "playing and recording tracks..";
// stop playback and recorder in 60 seconds
stopMix(duration, mix, recorder)
recorder.ondataavailable = function(event) {
chunks.push(event.data);
};
recorder.onstop = function(event) {
var blob = new Blob(chunks, {
"type": "audio/ogg; codecs=opus"
});
console.log("recording complete");
resolve(blob)
};
})
})
.then(function(blob) {
console.log(blob);
div.innerHTML = "mixed audio tracks ready for download..";
var audioDownload = URL.createObjectURL(blob);
var a = document.createElement("a");
a.download = description + "." + blob.type.replace(/.+\/|;.+/g, "");
a.href = audioDownload;
a.innerHTML = a.download;
document.body.appendChild(a);
a.insertAdjacentHTML("afterend", "<br>");
player.src = audioDownload;
document.body.appendChild(player);
})
})
.catch(function(e) {
console.log(e)
});
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div>loading audio tracks.. please wait</div>
</body>
</html>
您也可以使用 AudioContext.createChannelMerger（）， AudioContext.createChannelSplitter（）
var sources = ["/path/to/audoi1", "/path/to/audio2"];
var description = "mix";
var chunks = [];
var channels = [[0, 1], [1, 0]];
var audio = new AudioContext();
var player = new Audio();
var merger = audio.createChannelMerger(2);
var splitter = audio.createChannelSplitter(2);
var mixedAudio = audio.createMediaStreamDestination();
var duration = 60000;
var context;
var recorder;
var audioDownload;
player.controls = "controls";
function get(src) {
return fetch(src)
.then(function(response) {
return response.arrayBuffer()
})
}
function stopMix(duration, ...media) {
setTimeout(function(media) {
media.forEach(function(node) {
node.stop()
})
}, duration, media)
}
Promise.all(sources.map(get)).then(function(data) {
return Promise.all(data.map(function(buffer, index) {
return audio.decodeAudioData(buffer)
.then(function(bufferSource) {
var channel = channels[index];
var source = audio.createBufferSource();
source.buffer = bufferSource;
source.connect(splitter);
splitter.connect(merger, channel[0], channel[1]);
return source
})
}))
.then(function(audionodes) {
merger.connect(mixedAudio);
merger.connect(audio.destination);
recorder = new MediaRecorder(mixedAudio.stream);
recorder.start(0);
audionodes.forEach(function(node) {
node.start(0)
});
stopMix(duration, ...audionodes, recorder);
recorder.ondataavailable = function(event) {
chunks.push(event.data);
};
recorder.onstop = function(event) {
var blob = new Blob(chunks, {
"type": "audio/ogg; codecs=opus"
});
audioDownload = URL.createObjectURL(blob);
var a = document.createElement("a");
a.download = description + "." + blob.type.replace(/.+\/|;.+/g, "");
a.href = audioDownload;
a.innerHTML = a.download;
player.src = audioDownload;
document.body.appendChild(a);
document.body.appendChild(player);
};
})
})
.catch(function(e) {
console.log(e)
});
这篇关于是否可以将多个音频文件混合在一起，最好是用javascript的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
