{"id":11077,"date":"2023-12-24T21:47:59","date_gmt":"2023-12-24T13:47:59","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11077"},"modified":"2023-12-25T20:59:20","modified_gmt":"2023-12-25T12:59:20","slug":"js-fetch-video-audio-mp3-mp4-wav","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/12\/js-fetch-video-audio-mp3-mp4-wav\/","title":{"rendered":"\u4f7f\u7528JS\u63d0\u53d6\u89c6\u9891\u4e2d\u7684\u97f3\u9891\u8d44\u6e90"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11077\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11077<\/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\/202312-mp4-audio.jpg';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202312\/wave-cover-s.jpg\" width=\"480\" height=\"300\" alt=\"\u97f3\u9891\u5c01\u9762\u56fe\" class=\"alignright clip thumb size-medium\" \/><\/p>\n<h3>\u4e00\u3001\u9700\u6c42\u80cc\u666f\uff0c\u6545\u4e8b\u7531\u6765<\/h3>\n<p>\u4e0a\u4e2a\u6708\u6709\u4ecb\u7ecd\u8fc7<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/11\/mp4box-js-webcodecs-mp4-canvas\/\">\u5982\u4f55\u63d0\u53d6\u89c6\u9891\u7684\u5e8f\u5217\u5e27<\/a>\uff0c\u7136\u800c\u771f\u6b63\u7684\u89c6\u9891\u89e3\u7801\u5e94\u8be5\u662f\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u53d6\u753b\u9762\uff0c\u8fd8\u53ef\u4ee5\u63d0\u51fa\u97f3\u9891\u6570\u636e\u3002<\/p>\n<p>\u4e5f\u662f\u4f7f\u7528mp4box.js\u52a0WebCodecs API\u5417\uff1f<\/p>\n<p>\u6211\u6709\u5c1d\u8bd5\u8fc7\uff0c\u4f46\u662f\u89e3\u7801\u51fa\u7684\u97f3\u9891\u6570\u636e\u90fd\u662f0\uff0c\u4e0d\u77e5\u9053\u54ea\u91cc\u51fa\u4e86\u95ee\u9898\uff0c\u8fd8\u9700\u8981\u8fdb\u4e00\u6b65\u6392\u67e5\u4e0b\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u8981\u89e3\u51b3\u6b64\u9700\u6c42\u4e0d\u9700\u8981\u8fd9\u4e48\u9ebb\u70e6\uff0c\u4f7f\u7528Web Audio API\u5c31\u80fd\u641e\u5b9a\u3002<\/p>\n<p>\u6bd4\u65b9\u8bf4\u6b64demo\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202312\/js-fetch-mp4-audio-track-demo.php\" rel=\"noopener\" target=\"_blank\">JS\u63d0\u53d6\u89c6\u9891\u4e2d\u7684\u97f3\u9891\u97f3\u8f68\u5e76\u4e0b\u8f7ddemo<\/a><\/p>\n<h3>\u4e8c\u3001\u4ee5\u9009\u62e9\u672c\u5730\u6587\u4ef6\u4e3e\u4f8b<\/h3>\n<p>\u5047\u8bbe\u672c\u5730\u9009\u62e9\u7684\u6587\u4ef6\u662ffile\uff0c\u5219\u6211\u4eec\u53ef\u4ee5\u5c06file\u8f6c\u4e3aarraybuffer\u518d\u4f7f\u7528decodeAudioData\u8f6c\u4e3aaudioBuffer\uff0c\u6709\u4e86audioBuffer\u5c31\u53ef\u4ee5\u5bf9\u97f3\u9891\u4e3a\u6240\u6b32\u4e3a\uff0c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2020\/07\/js-audio-clip-copy-upload\/\">\u5206\u5272\uff0c\u590d\u5236<\/a>\uff0c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2023\/10\/js-audio-audiobuffer-concat-merge\/\">\u62fc\u63a5\uff0c\u5408\u5e76<\/a>\u90fd\u4e0d\u5728\u8bdd\u4e0b\uff0c\u81ea\u7136\u4e5f\u5305\u62ec\u8d44\u6e90\u7684\u63d0\u53d6\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u610f\uff1a<\/p>\n<pre>\/\/ \u5f00\u59cb\u8bc6\u522b\r\nconst reader = new FileReader();\r\nreader.onload = function (event) {\r\n    const arrBuffer = event.target.result;\r\n    \/\/ \u521b\u5efa\u97f3\u9891\u4e0a\u4e0b\u6587\r\n    const audioCtx = new AudioContext();\r\n    \/\/ arrayBuffer\u8f6caudioBuffer\r\n    audioCtx.decodeAudioData(arrBuffer, function(audioBuffer) {\r\n        \/\/ audioBuffer\u5c31\u662fAudioBuffer\r\n        \/\/ \u4e8e\u662f\u5c31\u53ef\u4ee5\u5bf9\u97f3\u9891\u8d44\u6e90\u4e3a\u6240\u6b32\u4e3a\r\n    });\r\n};\r\nreader.readAsArrayBuffer(file);<\/pre>\n<p>\u6838\u5fc3\u5b9e\u73b0\u5c31\u662f\u8fd9\u4e48\u7b80\u5355\u3002<\/p>\n<h3>\u4e09\u3001\u5982\u679c\u662f\u5728\u7ebfURL\u5730\u5740<\/h3>\n<p>\u5982\u679c\u662f\u5728\u7ebfURL MP4\/WebM\u89c6\u9891\u5730\u5740\uff0c\u5176\u5b9e\u73b0\u4e5f\u662f\u7c7b\u4f3c\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528fetch\u65b9\u6cd5\u83b7\u53d6\u89c6\u9891\u8d44\u6e90\uff0c\u8bb0\u5f97\u8fd4\u56dearraybuffer\u7c7b\u578b\uff0c\u4ee3\u7801\u793a\u610f\uff1a<\/p>\n<pre>fetch(url).then(res => res.arrayBuffer()).then(buffer => {\r\n    \/\/ \u521b\u5efa\u97f3\u9891\u4e0a\u4e0b\u6587\r\n    const audioCtx = new AudioContext();\r\n    \/\/ arrayBuffer\u8f6caudioBuffer\r\n    audioCtx.decodeAudioData(buffer, function(audioBuffer) {\r\n        \/\/ audioBuffer\u5c31\u662fAudioBuffer\r\n        \/\/ \u4e8e\u662f\u5c31\u53ef\u4ee5\u5bf9\u97f3\u9891\u8d44\u6e90\u4e3a\u6240\u6b32\u4e3a\r\n    });\r\n});<\/pre>\n<h3>\u56db\u3001\u4eceAudioBuffer\u4e2d\u63d0\u53d6\u97f3\u9891\u6587\u4ef6<\/h3>\n<p>\u5982\u679c\u5e0c\u671b\u64ad\u653eAudioBuffer\u6570\u636e\uff0c\u53ef\u4ee5\u501f\u52a9createBufferSource\u65b9\u6cd5\uff0c\u4ee3\u7801\u793a\u610f\uff08audioCtx\u590d\u7528\u4e0a\u9762\u7684\u4e0a\u4e0b\u6587\uff09\uff1a<\/p>\n<pre>\/\/ \u521b\u5efaAudioBufferSourceNode\u5bf9\u8c61\r\nconst source = audioCtx.createBufferSource();\r\nsource.buffer = audioBuffer;\r\nsource.connect(audioCtx.destination);\r\n\/\/ \u8d44\u6e90\u5f00\u59cb\u64ad\u653e\uff0c\u53ef\u4ee5\u6307\u5b9a\u4f4d\u7f6e\uff0c\u5177\u4f53\u770b\u76f8\u5173API\r\nsource.start();<\/pre>\n<p>\u5982\u679c\u5e0c\u671b\u8bbe\u7f6e\u97f3\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528GainNode\u5b9e\u4f8b\uff0c\u5982new GainNode(audioCtx)\uff0c\u6216\u8005audioCtx.createGain()\u521b\u5efagainNode\uff0c\u4ee3\u7801\u793a\u610f\uff1a<\/p>\n<pre>const audioCtx = new AudioContext();\r\nconst source = audioCtx.createBufferSource();\r\nconst gainNode = audioCtx.createGain();\r\n\/\/ \u97f3\u91cf20%\r\ngainNode.gain.value = 0.2;\r\ngainNode.connect(audioCtx.destination);\r\nsource.buffer = audioBuffer;\r\nsource.connect(gainNode);\r\nsource.start();<\/pre>\n<p>\u4e0d\u8fc7bufferSource\u8d44\u6e90\u7684\u64ad\u653e\u662f\u4e00\u6b21\u6027\u7684\uff0c\u64ad\u653e\u7ed3\u675f\uff0c\u6216\u8005\u6267\u884cstop()\u65b9\u6cd5\u540e\u5c31\u4f1a\u81ea\u52a8\u9500\u6bc1\uff0c\u9700\u8981\u91cd\u65b0buffer\u8d4b\u503c\u4e00\u6b21\uff0c\u8fd9\u4e00\u70b9\u9700\u8981\u6ce8\u610f\u4e0b\u3002<\/p>\n<h4>\u66f4\u7a33\u5065\u7684\u65b9\u6cd5<\/h4>\n<p>\u5f53\u7136\uff0c\u6709\u4e2a\u66f4\u7a33\u5065\u4e5f\u66f4\u5bb9\u6613\u7406\u89e3\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f\u5c06audioBuffer\u6570\u636e\u76f4\u63a5\u8f6c\u4e3aWAV\u97f3\u9891\u8d44\u6e90\uff0c\u5176\u8f6c\u6362\u65b9\u6cd5\u4e1a\u5185\u516c\u5f00\u7684\uff0c\u4e0d\u8db3\u767e\u884c\u4ee3\u7801\uff0c\u8fd9\u91cc\u4e0d\u5c55\u793a\u4e86\uff0c\u5b8c\u6574\u4ee3\u7801\u8bbf\u95ee<a href=\"https:\/\/www.zhangxinxu.com\/study\/202312\/js-fetch-mp4-audio-track-demo.php\" rel=\"noopener\" target=\"_blank\">demo\u9875\u9762<\/a>\u83b7\u53d6\u3002<\/p>\n<h4>\u6f14\u793a\u9875\u9762<\/h4>\n<p>\u65e0\u8bba\u662f\u672c\u5730\u6587\u4ef6\uff0c\u8fd8\u662f\u7ebf\u4e0a\u8d44\u6e90\u7684\u97f3\u9891\u63d0\u53d6\uff0c\u6211\u90fd\u505a\u5728\u8fd9\u4e2a\u6f14\u793a\u9875\u9762\u4e0a\u4e86\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202312\/js-fetch-mp4-audio-track-demo.php\" rel=\"noopener\" target=\"_blank\">JS\u63d0\u53d6\u89c6\u9891\u4e2d\u7684\u97f3\u9891\u97f3\u8f68\u5e76\u4e0b\u8f7ddemo<\/a><\/p>\n<p>\u4f8b\u5982\u6211\u9009\u62e9\u4e00\u4e2a\u5728B\u7ad9\u6700\u8fd1\u53d1\u5e03\u7684\u8fd9\u4e2a\u89c6\u9891\u6587\u4ef6\uff0c\u7a0d\u7b49\u6570\u79d2\u540e\uff0c\u97f3\u9891\u5c31\u89e3\u6790\u51fa\u6765\u4e86\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202312\/2023-12-24_205827.png\" width=\"571\" height=\"504\" alt=\"\u672c\u5730\u6587\u4ef6\u97f3\u9891\u89e3\u6790\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4e5f\u53ef\u4ee5\u70b9\u51fb\u4e0b\u65b9\u7684\u6587\u5b57\u6309\u94ae\uff0c\u76f4\u63a5\u4e0b\u8f7d\u5bf9\u5e94\u7684WAV\u97f3\u9891\u8d44\u6e90\u3002<\/p>\n<p>\u7531\u4e8e\u8fd9\u91cc\u7684Wav\u97f3\u9891\u662f\u65e0\u635f\u5904\u7406\u7684\uff0c\u56e0\u6b64\u97f3\u9891\u8d44\u6e90\u7684\u4f53\u79ef\u6bd4\u4e00\u822c\u7684\u8981\u5927\u4e9b\uff0c\u662f\u6b63\u5e38\u7684\uff0c\u4e0d\u8fc7\u6bd4\u89c6\u9891\u8fd8\u662f\u5c0f\u5f88\u591a\u7684\u3002<\/p>\n<h3>\u4e94\u3001\u5982\u679c\u4f60\u53ea\u60f3\u628a\u89c6\u9891\u5f53\u97f3\u9891\u64ad\u653e<\/h3>\n<p>\u90a3\u5c31\u76f4\u63a5\u64ad\u653e\u597d\u4e86\uff0c\u65e0\u8bba\u662f<code>&lt;audio&gt;<\/code>\u5143\u7d20\uff0c\u8fd8\u662fWeb Audio API\uff0c\u90fd\u662f\u652f\u6301\u76f4\u63a5\u64ad\u653e\u89c6\u9891\u6587\u4ef6\u7684\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u7f51\u7edcMP4 URL\u5730\u5740\uff0c\u60f3\u8981\u4f5c\u4e3a\u89c6\u9891\u64ad\u653e\uff0c\u7b80\u5355\uff1a<\/p>\n<pre>const url = 'xxxx.mp4';\r\nconst audio = new Audio();\r\naudio.src = url;\r\n\/\/ \u5982\u679c\u9875\u9762\u5df2\u7ecf\u70b9\u51fb\u6216\u89e6\u6478\u6216\u952e\u76d8\u8bbf\u95ee\u8fc7\r\naudio.play();<\/pre>\n<p>\u5982\u679c\u662f\u672c\u5730\u89c6\u9891\u6587\u4ef6\uff0c\u5219\u53ef\u4ee5\u5c06\u6587\u4ef6\u8f6c\u4e3aBase64\u5730\u5740\u6216Blob\u5730\u5740\u64ad\u653e\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>file.onchange = function (event) {\r\n    const file = event.target.files[0];\r\n    \/\/ \u521b\u5efa\u97f3\u9891\u5730\u5740\r\n    const url = URL.createObjectURL(file);\r\n    const audio = new Audio();\r\n    audio.src = url;\r\n    audio.play();\r\n};<\/pre>\n<p>\u662f\u4e0d\u662f\u7b80\u5355\u7684\u6709\u4e9b\u610f\u5916 ?<\/p>\n<h3>\u516d\u3001\u518d\u8bf4\u70b9\u5176\u4ed6\u70b9\u4ec0\u4e48<\/h3>\n<p>\u60f3\u60f3\u770b\u8fd8\u6709\u6ca1\u6709\u4ec0\u4e48\u8865\u5145\u7684\uff0c\u54e6\uff0c\u5bf9\u4e86\uff0c\u89c6\u9891\u5f80\u5f80\u662f\u5927\u6587\u4ef6\uff0c\u4f7f\u7528fetch\u8bfb\u53d6\u5f80\u5f80\u4f1a\u6709\u6bd4\u8f83\u957f\u7684\u8017\u65f6\uff0c\u6700\u597d\u53ef\u4ee5\u6709\u4e2a\u8fdb\u5ea6\u63d0\u793a\u6548\u679c\u3002<\/p>\n<p>\u4ee5\u4e0b\u4ee3\u7801\u5e94\u8be5\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1a<\/p>\n<pre>\/\/ \u83b7\u53d6\u89c6\u9891\u7684arraybuffer\u6570\u636e\r\nfetch(videourl)\r\n  .then((res) =&gt; {\r\n    const contentLength = res.headers.get(\"content-length\");\r\n    const reader = res.body.getReader();\r\n\r\n    let lengthReceived = 0;\r\n    let chunks = [];\r\n\r\n    reader.read().then(function processText({ done, value }) {\r\n      if (done) {\r\n        const chuckAll = new Uint8Array(lengthReceived);\r\n        let position = 0;\r\n        for (const chunk of chunks) {\r\n          chuckAll.set(chunk, position);\r\n          position += chunk.length;\r\n        }\r\n        \/\/ \u8fd4\u56de buffer \u7ed9 \u540e\u7eed\u529f\u80fd\u4f7f\u7528\r\n        const buffer = chuckAll.buffer;\r\n\r\n        return;\r\n      }\r\n\r\n      chunks.push(value);\r\n\r\n      \/\/ \u6d41\u6570\u636e\u662fUint8Array\r\n      lengthReceived += value.length;\r\n\r\n      \/\/ progress\u7684\u503c\u5c31\u662f\u8fdb\u5ea6\u503c\r\n      const progress = Math.round((100 * lengthReceived) \/ contentLength);\r\n\r\n      \/\/ \u7ee7\u7eed\u8bfb\u53d6\u89c6\u9891\u6d41\r\n      return reader.read().then(processText);\r\n    });\r\n  })\r\n  .catch((err) =&gt; {\r\n    console.error(\"\u83b7\u53d6\u89c6\u9891\u6570\u636e\u9519\u8bef\uff1a\", err);\r\n  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\/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11077\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11077<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202312\/wave-cover-s.jpg\" width=\"160\" height=\"100\" alt=\"\u97f3\u9891\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" \/><\/p>\n<p>\u5176\u5b9e\u4f7f\u7528Web Audio 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