{"id":11022,"date":"2023-10-10T22:53:25","date_gmt":"2023-10-10T14:53:25","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11022"},"modified":"2023-10-10T22:53:25","modified_gmt":"2023-10-10T14:53:25","slug":"js-audio-audiobuffer-concat-merge","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/10\/js-audio-audiobuffer-concat-merge\/","title":{"rendered":"\u7eafJS\u5b9e\u73b0\u591a\u4e2a\u97f3\u9891\u7684\u62fc\u63a5\u6216\u8005\u5408\u5e76"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11022\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11022<\/a> \u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202310-audio-concat-merge.png';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202310\/audio-concat-cover.png\" width=\"252\" height=\"155\" alt=\"\u97f3\u9891\u6ce2\u5f62\u5c01\u9762\u5360\u4f4d\u56fe\" class=\"alignright clip thumb size-medium\" \/><\/p>\n<h3>\u4e00\u3001\u6e29\u6545\u800c\u77e5\u65b0<\/h3>\n<p>3\u5e74\u524d\u6709\u66f4\u65b0\u8fc7<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2020\/07\/js-audio-clip-copy-upload\/\">JS\u5bf9audio\u97f3\u9891\u526a\u88c1\u7684\u5b9e\u73b0<\/a>\uff0c\u6628\u5929\u66f4\u65b0\u4e86<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/10\/js-web-audio-audiobuffer-volume\/\">JS\u6539\u53d8\u539f\u59cb\u97f3\u9891\u4fe1\u606f\u6765\u5b9e\u73b0\u97f3\u91cf\u7684\u8c03\u6574<\/a>\uff0c\u4eca\u5929\u6211\u4eec\u518d\u8bb2\u8bb2\u5982\u4f55\u4f7f\u7528JS\u5b9e\u73b0\u591a\u4e2a\u97f3\u9891\u7684\u62fc\u63a5\uff08\u4e0b\u56fe1\uff09\u4e0e\u5408\u5e76\uff08\u4e0b\u56fe2\uff09\u3002<\/p>\n<p>\u62fc\u63a5\uff1a<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202310\/2023-10-10_225049.png\" width=\"227\" height=\"63\" alt=\"\u62fc\u63a5\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5408\u5e76\uff1a<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202310\/2023-10-10_225235.png\" width=\"134\" height=\"107\" alt=\"\u5408\u5e76\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u8fd9\u4e0b\u5b50\uff0c\u7eafJS\u64cd\u4f5cMP3\/WAV\u97f3\u9891\u8d44\u6e90\u7684\u6d3b\u513f\u90fd\u9f50\u5168\u4e86\u3002<\/p>\n<p>\u64cd\u4f5c\u8fc7\u7a0b\u672c\u8d28\u4e0a\u5927\u540c\u5c0f\u5f02\u3002<\/p>\n<p>ArrayBuffer\u8f6cAudioBuffer\uff0c\u7136\u540e\u8bfb\u53d6\u97f3\u9891\u4fe1\u606f\uff0c\u5bf9\u91c7\u6837\u4fe1\u606f\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u8bdd\u4e0d\u591a\u8bf4\uff0c\u6765\u770b\u770b\u5982\u4f55\u5b9e\u73b0\u7684\u3002<\/p>\n<h3>\u4e8c\u3001\u591a\u4e2a\u97f3\u9891\u7684\u62fc\u63a5<\/h3>\n<p>\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>\/\/ \u62fc\u63a5\u97f3\u9891\u7684\u65b9\u6cd5\r\nconst concatAudio = (arrBufferList) =&gt; {\r\n    \/\/ \u83b7\u5f97 AudioBuffer\r\n    const audioBufferList = arrBufferList;\r\n    \/\/ \u6700\u5927\u901a\u9053\u6570\r\n    const maxChannelNumber = Math.max(...audioBufferList.map(audioBuffer =&gt; audioBuffer.numberOfChannels));\r\n    \/\/ \u603b\u957f\u5ea6\r\n    const totalLength = audioBufferList.map((buffer) =&gt; buffer.length).reduce((lenA, lenB) =&gt; lenA + lenB, 0);\r\n\r\n    \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684 AudioBuffer\r\n    const newAudioBuffer = audioContext.createBuffer(maxChannelNumber, totalLength, audioBufferList[0].sampleRate);\r\n    \/\/ \u5c06\u6240\u6709\u7684 AudioBuffer \u7684\u6570\u636e\u62f7\u8d1d\u5230\u65b0\u7684 AudioBuffer \u4e2d\r\n    let offset = 0;\r\n\r\n    audioBufferList.forEach((audioBuffer, index) =&gt; {\r\n        for (let channel = 0; channel &lt; audioBuffer.numberOfChannels; channel++) {\r\n            newAudioBuffer.getChannelData(channel).set(audioBuffer.getChannelData(channel), offset);\r\n        }\r\n\r\n        offset += audioBuffer.length;\r\n    });\r\n\r\n    return newAudioBuffer;\r\n}<\/pre>\n<p>\u8bed\u6cd5\uff1a<\/p>\n<pre>concatAudio(arrBufferList);<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt><strong>arrBufferList<\/strong><\/dt>\n<dd>\u6307\u9700\u8981\u5408\u5e76\u7684AudioBuffer\u6570\u7ec4\u3002<\/dd>\n<\/dl>\n<p>\u90a3\u5982\u4f55\u83b7\u5f97\u97f3\u9891\u7684AudioBuffer\u6570\u636e\u5462\uff1f<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528 <code>new AudioContext().decodeAudioData(arrayBuffer)<\/code> \u65b9\u6cd5\u8f6c\u6362\u3002<\/p>\n<p>\u90a3\u5982\u4f55\u5f97\u5230arrayBuffer\u6570\u636e\u5462\uff1f<\/p>\n<p>\u672c\u5730\u8d44\u6e90\u53ef\u4ee5\u4f7f\u7528FileReader\u5bf9\u8c61\u8bfb\u53d6\u4e3aArrayBuffer\uff0c\u5728\u7ebf\u8d44\u6e90\u53ef\u4ee5\u4f7f\u7528fetch\u8bf7\u6c42\u83b7\u53d6\u3002<\/p>\n<p>\u8fd9\u91cc\u6f14\u793a\u4f7f\u7528Fetch API\u5f97\u5230\u97f3\u9891\u7684AudioBuffer\u6570\u636e\u3002<\/p>\n<pre>\/\/ AudioContext\r\nconst audioContext = new AudioContext();\r\n\/\/ \u57fa\u4e8esrc\u5730\u5740\u83b7\u5f97 AudioBuffer \u7684\u65b9\u6cd5\r\nconst getAudioBuffer = (src) =&gt; {\r\n    return new Promise((resolve, reject) =&gt; {\r\n        fetch(src).then(response =&gt; response.arrayBuffer()).then(arrayBuffer =&gt; {\r\n            audioContext.decodeAudioData(arrayBuffer).then(buffer =&gt; {\r\n                resolve(buffer);\r\n            });\r\n        })\r\n    })\r\n}<\/pre>\n<p>\u5047\u8bbe\u73b0\u5728\u6709\u4e0b\u9762\u4e24\u4e2a\u97f3\u9891\u5730\u5740\uff1a<\/p>\n<pre>const audioSrc = [\r\n    '.\/assets\/1.wav',\r\n    '.\/assets\/2.wav'\r\n];<\/pre>\n<p>\u5219\u4f7f\u7528\u4e0b\u9762\u51e0\u884cJS\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5f97\u5230concat\u62fc\u63a5\u540e\u7684\u65b0\u7684\u97f3\u9891\u7684AudioBuffer\u6570\u636e\u4e86\u3002<\/p>\n<pre>const arrBufferList = await Promise.all(audioSrc.map(src =&gt; getAudioBuffer(src)));<\/pre>\n<p>\u6709\u4e86AudioBuffer\u6570\u636e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u64ad\u653e\u97f3\u9891\uff0c\u6216\u8005\u8f6c\u4e3a\u53ef\u4e0b\u8f7d\u7684\u97f3\u9891\u683c\u5f0f\u3002<\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202310\/js-audio-concat-merge-demo.php\" rel=\"noopener\" target=\"_blank\">\u7eafJS\u5b9e\u73b0\u97f3\u9891\u7684\u5408\u5e76\u6216\u62fc\u63a5demo<\/a><\/p>\n<p>\u70b9\u51fb\u6f14\u793a\u9875\u9762\u4e2d\u7684\u201c\u62fc\u63a5\u201d\u6309\u94ae\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u6b64\u65f6\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u5728\u4e0b\u9762\u7684\u8272\u5757\u533a\u57df\u5185\u663e\u793a\u4e86\u62fc\u63a5\u540e\u7684\u97f3\u9891\u4e86\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202310\/2023-10-10_222050.png\" width=\"516\" height=\"309\" alt=\"\u97f3\u9891\u62fc\u63a5demo\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<h3>\u4e09\u3001\u591a\u4e2a\u97f3\u9891\u7684\u5408\u5e76<\/h3>\n<p>\u97f3\u9891\u7684\u5408\u5e76\u6307\u7684\u662f\u591a\u4e2a\u97f3\u9891\u540c\u65f6\u64ad\u653e\uff0c\u4f46\u662f\u662f\u5408\u5728\u4e00\u4e2a\u89c6\u9891\u4e2d\u3002<\/p>\n<p>\u6211\u4e5f\u5f04\u4e86\u4e2aJS\u51fd\u6570\u65b9\u6cd5\uff1a<\/p>\n<pre>\/\/ \u5408\u5e76\u97f3\u9891\u7684\u65b9\u6cd5\r\nconst mergeAudio = (arrBufferList) =&gt; {\r\n    \/\/ \u83b7\u5f97 AudioBuffer\r\n    const audioBufferList = arrBufferList;\r\n    \/\/ \u6700\u5927\u64ad\u653e\u65f6\u957f\r\n    const maxDuration = Math.max(...audioBufferList.map(audioBuffer =&gt; audioBuffer.duration));\r\n    \/\/ \u6700\u5927\u901a\u9053\u6570\r\n    const maxChannelNumber = Math.max(...audioBufferList.map(audioBuffer =&gt; audioBuffer.numberOfChannels));\r\n    \/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684 AudioBuffer\r\n    const newAudioBuffer = audioContext.createBuffer(maxChannelNumber, audioBufferList[0].sampleRate * maxDuration, audioBufferList[0].sampleRate);\r\n    \/\/ \u5c06\u6240\u6709\u7684 AudioBuffer \u7684\u6570\u636e\u5408\u5e76\u5230\u65b0\u7684 AudioBuffer \u4e2d\r\n    audioBufferList.forEach((audioBuffer, index) =&gt; {\r\n        for (let channel = 0; channel &lt; audioBuffer.numberOfChannels; channel++) {\r\n            const outputData = newAudioBuffer.getChannelData(channel);\r\n            const bufferData = audioBuffer.getChannelData(channel);\r\n\r\n            for (let i = audioBuffer.getChannelData(channel).length - 1; i &gt;= 0; i--) {\r\n                outputData[i] += bufferData[i];\r\n            }\r\n\r\n            newAudioBuffer.getChannelData(channel).set(outputData);\r\n        }\r\n    });\r\n\r\n    return newAudioBuffer;\r\n}<\/pre>\n<p>\u5176\u4e2d\uff1a<\/p>\n<dl>\n<dt><strong>arrBufferList<\/strong><\/dt>\n<dd>\u6307\u9700\u8981\u5408\u5e76\u7684AudioBuffer\u6570\u7ec4\u3002<\/dd>\n<\/dl>\n<p>mergeAudio \u65b9\u6cd5\u7684\u8bed\u6cd5\u548c\u5177\u4f53\u7684\u4f7f\u7528\u548c\u4e0a\u9762\u7684 concatAudio \u65b9\u6cd5\u7c7b\u4f3c\uff0c\u8fd9\u91cc\u5c31\u4e0d\u518d\u8d58\u8ff0\u4e86\u3002<\/p>\n<p>demo\u4e5f\u662f\u540c\u4e00\u4e2a\u9875\u9762\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202310\/js-audio-concat-merge-demo.php\" rel=\"noopener\" target=\"_blank\">\u7eafJS\u5b9e\u73b0\u97f3\u9891\u7684\u5408\u5e76\u6216\u62fc\u63a5demo<\/a><\/p>\n<p>\u70b9\u51fb\u201c\u5408\u5e76\u201d\u6309\u94ae\uff0c\u5c31\u53ef\u4ee5\u5f97\u5230\u80cc\u666f\u97f3\u4e50\u548c\u6bb5\u843d\u97f3\u9891\u5408\u4e8c\u4e3a\u4e00\u540e\u7684\u65b0\u7684\u97f3\u9891\u4e86\uff08\u53f3\u952e\u64ad\u653e\u5668\u53ef\u4ee5\u4e0b\u8f7d\u6b64\u89c6\u9891\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202310\/2023-10-10_222555.png\" width=\"436\" height=\"247\" alt=\"\u5408\u5e76\u97f3\u9891\u64ad\u653e\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5b8c\u6574\u7684\u5b9e\u73b0\u4ee3\u7801\u5747\u5728demo\u9875\u9762\u4e0a\u3002<\/p>\n<p>\u76f8\u4fe1\u56fd\u5185\u6ca1\u6709\u6bd4\u6211\u8fd9\u91cc\u66f4\u76f4\u89c2\u66f4\u5bb9\u6613\u4e0a\u624b\u7684\u6f14\u793a\u4ee3\u7801\u4e86\u3002<\/p>\n<h3>\u56db\u3001\u4f7f\u7528\u5f00\u6e90\u7684\u9879\u76ee<\/h3>\n<p>\u5982\u679c\u4f60\u5bf9\u539f\u751f\u5b9e\u73b0\u4e0d\u600e\u4e48\u611f\u5174\u8da3\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5f00\u6e90\u9879\u76ee\u3002<\/p>\n<p>\u5176\u5b9e\u8fd8\u633a\u591a\u7684\uff0c\u4e4b\u524d\u627e\u4e86\u4e00\u4e2a\uff0c\u6ca1\u8bb0\u4f4f\uff0c\u5fd8\u8bb0\u4e86\u3002<\/p>\n<p>\u90a3\u5c31\u7528\u8fd9\u4e2a\u9879\u76ee\u5427\uff0c\u540d\u5b57\u5947\u5947\u602a\u602a\u7684\uff0c\u53eb\u505acrunker\uff1a<a href=\"https:\/\/github.com\/jaggad\/crunker\" rel=\"noopener\" target=\"_blank\">https:\/\/github.com\/jaggad\/crunker<\/a><\/p>\n<p>\u4f7f\u7528\u793a\u610f\uff1a<\/p>\n<pre>let crunker = new Crunker();\r\n\r\ncrunker\r\n  .fetchAudio('\/song.mp3', '\/another-song.mp3')\r\n  .then((buffers) =&gt; {\r\n    \/\/ =&gt; [AudioBuffer, AudioBuffer]\r\n    return crunker.mergeAudio(buffers);\r\n  })\r\n  .then((merged) =&gt; {\r\n    \/\/ =&gt; AudioBuffer\r\n    return crunker.export(merged, 'audio\/mp3');\r\n  })\r\n  .then((output) =&gt; {\r\n    \/\/ =&gt; {blob, element, url}\r\n    crunker.download(output.blob);\r\n    document.body.append(output.element);\r\n    console.log(output.url);\r\n  })\r\n  .catch((error) =&gt; {\r\n    \/\/ =&gt; Error Message\r\n  });<\/pre>\n<p>\u5982\u679c\u4f60\u5df2\u7ecf\u6709\u4e86 AudioBuffer \u8d44\u6e90\uff0c\u4e0a\u9762\u7684 fetchAudio() 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