實現base64格式的amr音訊檔案在IOS、android微信內建瀏覽器的播放
阿新 • • 發佈：2019-02-17
參考文件：
1.https://github.com/yxl/opencore-amr-js （將amr檔案轉為wav格式的編解碼專案）
因為專案需要，要將amr的base46格式的音訊檔案在IOS，android微信內建瀏覽器播放。專案中使用的第三方IM為融雲，經過調研發現，使用融雲js播放語音的方式，可以在IOS上播放，但是在Android上無法播放，而且h5的audio元件，不支援amr格式的音訊檔案。
最後得出的結論，IOS上的audio支援amr格式播放，android上audio元件不支援amr格式播放，包括使用融雲js播放語音的方式，使用的也是audio元件。
想到的方案是，將amr的base64檔案進行格式轉換，轉換為mp3，wav等audio支援的格式，然後進行播放，沒有找到很好的資源。
經過領導的一句話，嘗試性的找融雲客服諮詢了一下，看看有沒有相關的專案，客服給了opencore-amr-js專案，是將amr格式的檔案轉換為wav格式的音訊檔案，進行播放。
將專案釋出到測試環境，在微信內建瀏覽器跑了一下，得到的答案是，android可以正常播放，但是IOS無法播放；其中有一個物件，在IOS環境中，好像是找不到，執行就報錯。
於是，綜合了一下，得到了最終的解決方案，
IOS使用融雲js進行語音播放，Android使用opencore-amr-js進行語音播放；播放語音時，判斷機器為Android還是IOS，來選擇播放方式。
在將opencore-amr-js專案往自己專案遷移的過程中，發現，融雲js中使用的Libamr-2.2.5.min.js
下面，將Android播放語音的程式碼放在下面：
demo下載地址，demo在專案的js目錄下面。
<!DOCTYPE html> <html> <head> <title>AMR decode/encode tests</title> <script src="amrnb.js" defer></script> </head> <body> <h2>Test decoder</h2> <p id="test"> Convert <a href="yuan.amr">yuan.amr</a> to wav file and compare with <a href="yuan.wav">yuan.wav</a>: <button>Test</button> </p> <h2>Decode amr file and play</h2> <p id="sample-amr"> <button>Play</button> <a href="yuan.amr">yuan.amr</a> </p> <p> Select a local file and play: <input type="file" id="amr-file" accept=".amr"> </p> <h2>Encode audio to amr file and play</h2> <p id="sample-audio"> <button>Encode & Play</button> <a href="hello.ogg">hello.ogg</a> </p> <p> Select a local file to encode and play: <input type="file" id="audio-file" accept="audio/*"> </p> <h2>base64測試</h2> <input id="base64-input" type="text" style="width:800px;height: 200px;"> <p id="base64-audio"> <button>base64 & Play</button> </p> <p id="base64-audio2"> <button>base64 & Play</button> </p> <p id="base64-audio3"> <button>base64 & Play</button> </p> <p id="base64-audio4"> <button>base64 & Play</button> </p> <p id="base64-audio5"> <button>base64 & Play</button> </p> <h2>Amr to wav</h2> <p id="amr-to-wav"> <button>Convert to wav and play</button> <a href="yuan.amr">yuan.amr</a> </p> <p> Select a local file, convert and play: <input type="file" id="amr-to-wav-file" accept=".amr"> </p> <p>wav file content:</p> <pre></pre> <script> // var u = navigator.userAgent; // var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android終端 // var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios終端 // alert('是否是Android：'+isAndroid); // alert('是否是iOS：'+isiOS); function E(selector) { return document.querySelector(selector); } E('#test > button').onclick = function () { fetchAndReadBlob('yuan.amr', function (amr) { fetchAndReadBlob('yuan.wav', function (expected) { var actual = AMR.toWAV(amr); if (actual == null) { alert('Failed to decode amr file.'); return; } if (actual.length != expected.length) { alert('The converted wav file has different size.'); return; } for (var i = 0; i < actual.length; i++) { if (actual[i] != expected[i]) { alert('The converted wav file has different content.'); return; } } alert('Succeeded!'); }); }); }; E('#sample-amr > button').onclick = function () { fetchBlob(E('#sample-amr > a').href, function (blob) { playAmrBlob(blob); }); }; E('#amr-file').onchange = function () { playAmrBlob(this.files[0]); }; E('#amr-to-wav > button').onclick = function () { fetchBlob(E('#amr-to-wav > a').href, function (blob) { convertAmrBlobToWav(blob); }); }; E('#amr-to-wav-file').onchange = function () { convertAmrBlobToWav(this.files[0]); }; E('#sample-audio > button').onclick = function () { fetchBlob(E('#sample-audio > a').href, function (blob) { convertAudioBlobToAmr(blob); }); }; E('#base64-audio > button').onclick = function () { playAmrToWav('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'); // var buffer = AMR.toWAV(result); //// E('pre').textContent = toHex(buffer); // var url = URL.createObjectURL(new Blob([buffer], {type: 'audio/wav'})); // // Play wav buffer // var audio = new Audio(url); // audio.onloadedmetadata = audio.onerror = function () { // URL.revokeObjectURL(url); // }; // audio.play(); // playAmrBlob(E('#base64-input').value); }; E('#base64-audio2 > button').onclick = function () { playAmrToWav('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'); }; E('#base64-audio3 > button').onclick = function () { 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}; E('#base64-audio4 > button').onclick = function () { playAmrToWav('IyFBTVIKLEWGYIDYAbvFOH2GfsiOIegRLMIqLEkrjgtAHkTQivDmfVM1jaNZEngILE2GwAPEmHx5NDk7pUNLUfWYUsHoLEgkjgtMXPPQwhrzXi7BBeVsCTl8LCwkwAeF+DQZtU6aHy/oi85xm48+LEQZTg8IfgSxFs8MTWkmTJnCiVeQLAmWQA8DcwJqRyWK6D1JXNiGT1/kLCCtjhwg/i4HQxYBTh/FyL0c4PKGLEOUnB8ECWzBtivj/o0uCKBOSVwaLERviBwjOO1SQyDHHShqp6v5ntQ6LIK0jpaN20m16Ebxbex+FST/0L6cLESbnFiime8ELtBDikj7R/v6kpIGLJAYHB7i/IW3MtgZjH8HkdlbX+rQLENADj2QDXL1/KDsHpJRFQkItcEKLJA/slqjGeHpl6LdmIvkg+s3mzP6LGgYHB9gmUS7M7dqXkMDBu1gS3xCLE8Rhw5pGcJiYMXkGiFCKV12SAZSLEwYsh+gnLQ+jtRY/HnRKOJ9ze1kLGiksh/A3DJFpp97NdhcYOKEjY5wLEzDnJdhDXHBDiasPfK6kXn+4t5mLE7bjh9gmT5rYfVsrppPiaj1HjgMLE1TnB9APIbLx4jNHneWgW2iXYYqLE5vjhfiHD5ogLu4T3Qa1UbBahXaLEBHsh6D2gTTLIciRh0Tpc+iVlQILEXtmh8COJcs4kOVfNmoU5JsVakWLEPtnBygeMf3F/mGHbA4xUxe72hsLCGWTh9CmefiloFgDeKuKaG3U4vkLEQknB4Jmfbed4B0/leEBU/3kXvOLEJyKBaNmWa/9pZULJ81ybNlqQb6LEgkjh8gaDKMxnuUHlamQX/UemkgLGWM6DzrvLaw9ebQvsl/gdtq1JVWLCVtgjxUVJO9VBapXB2CoWXvVa/8LDnZJSyf4Znt7JhPhFcGNQkWclhWLEf8SrVegZylvp9g/P9iEfJEy2sMLFPiJlu/oZtTz7VSzkGsmayKKCI2LGj1tUq/AeNOQtTJFTOCiXV0GGHWLGnvsJd+IeH39jqHTLSmjH1C2snKLHHv4HmegeNZxtdQlaUmIOCZyX4wLHChQh//QeH78fuffDEfFMIdocpYLHL3sNMeAfyyNI/qrA/44/JuLMHoLGL3ZD3eAftY11c1zoJeCdUn+ZpCLDg3sQ7JYftF3HPDP3auAcW0WiZkLCJ+sQ6pQf4RnasrvNEKJ5s40NxcLCAIZB6A5gGVfxsG9sOqAfc7gMw4LFMysFs/4fn0bfPqpmi6mbIWK2omLGHFsDzfoeH57frW/nVSBeW7sw1SLHC2sB/+gf4KBCfzZDSiQ+FiwAWeLHChZFu8Yf4CAv0J7YaLhfD1Kc5wLGj1Yh/+Af4JgOOVnw24C9XHhTbgLHA3ZlucI1YTA1YhRKbfZWmjQG4GLEXi+h77RgYYGNtb7iRzAdw7Mf0CLET1Zh9YZgYKQ6qozI+HQeM5POxSLCC34B4JZgH//Xxs/OO+CMCjccKmLCAIQh5VpgYXGIywl1bGIXTHhEu2LBC3nB4Q5gYGnzAZXdrSgeYC41nQLBI3Th8VpgSt7jMBfSbnAe6zPABOLGM7bFr2ydSww/fk+ePQwf/X+VYaLCSiGpZvwbHzoToBnwgKgddS66KSLFE63D1f4eYZgmApz3eOkW/afFkWLFE6bB/+weYPiAEhftcYIeX2lmloLGPirnmf4eYVisIZlyMPAem2lJS0LHBy4B//IeNfx/SG1hbHGMy0DU3CLHBHjlu/of4SFgJQVFVnEXEMEpbmLE/vQw7/Qf4GEDIElOy+AazKCmUSLHD3Qw7+Af4MEBP6j0a6Be1yedHWLHHv6h/+Af4WACEjvKfQceEY8sEULHHv+lu6QftCQZDpVJR7IOd2sYNiLFKhZB//gf4ACvIuNAHXELqcgNS+LCznwB94Yf4Lmhp8Pkv2BONMt81ALAg3QBpg4f5PP/cInjSSJOiLlENqLEgQsh4AJKN/JSH6Hh4fBfrq6VNiLDgINy1e9N87K86T5Mu7wW+R/nk8LGI3jh//Ae4LTm/T3FOAIcIHxtpQLHF4Nh/+Qf4ag1ujnf9hBfkSJZkmLHA3sDzeg1YdBQVhDh6axe/mTwV6LHA3+h/+RgYCgTiVGsvQ85+CFtZ8LGj1+h/+Rh4UAJIz+GmGA5QbaGCKLEz1Zh+vBh4Ww+AXHGnGkGXA8FQSLEeNZB9F5mYaEsVjng1CmNsYOQ0GLCPiph9YZmS6t2o6Th444dYr84ZcLCFYjh8C5mZMnzUftDD8sb4L0wk6LBPFnB6DRmz1Dph11WBSjOEpk8ueLBNYQB4Bzu6e35l5TZ9qpclry2LaLCFBnB5Bnr4IDlr4Pb4qEf4/qJsSLGhyBB7HPT5pb39wvZUQUc5NLbxqLC1/yw+xjFPJX0E//vN2E2kVmTS6LCM6mNIDsbN3OgRHU/BzBMX6OmvALGHibB/+Qfn6abmkhnbOhfovgqOQLGPi4Q7/IftOTzLn3uf0sawJS0OQLHBHdD3fYftcQZSEb6wKKKjC2jiiLHBHZD3eof4Ql0lIXoc1C75mc1oULHHv6h/+Af4fkYLdGY2JRMRNCIBULHHvZB/vJgHmcp873cJDAW2tJIuALHHv6jzehgYQES00HihqIWWzwgYWLGLn+j0SxgYMAY3VBX1+g8imEVLALGL1+h6vBgS0Iem3VWWfAeFaF+EQLC3F+h4ZZgNe2VBMP27GA/e8v06aLBA3nBegxgNJHiY9bgG/EbphGXByLGl/jh4pvxyn4Riq08nWCOZzk3toLDjuNlsqIb5UeraZ0UNCI6EYSwyCLHF4aB/eBgSiLO287OZxEW1ZBp0WLHI3Nh+/JgHk817e1asBB6EboLEsLHI39h//JgYJlqVeukAyafhOBVJ8LHMr+w7+Bh4KGGPatxPTEdQqWAGCLHCh+h7eJh4WyciYS75Po7shUB28LHBHZh++BmYYEi7lHLxEgv346t5sLGJHIh+aRmYOgd8FyxBjAvIwiPU4LFKvph6Upn4WBia/vxxyEe9CnK8yLESvZB5BRn4jEjbY/d5MMuNlqKXoLC3i6h4IZ4m20DWvHFrYVq8Bi28aLEQPZBaB3mH2J4zknPGENONyjJT+LCGZnB4QLliTV/i7nTF8sbKy1A8MLEwRTg8ADjcZJqtE9rS1IfoGqHBwLHeQ2DxO+cau6HDn+WlSKOGm+FJsLC3mHGGGIeYyjHL5fHiuQ9Ct/WtMLGHiGw5v+fym2X4n7DQdFRpXBNo+LHFhhQ7/w1YTTkUfG5nPA8Y8Qt02LHJyjh//hgNMVnZ7aLk+wfmcYjUQLHJHZD3fBgYEGsz5eQbaMa0Qw4ciLHPvwB/+BgYKk0i6PgzpBW8IKaVOLHPvZB/+BgNP27ekLnXQsfsaN8VKLHK2Zh7+Bhy0KiZV+pDRLX3yYKAcLHPvph++Bh4EFrS93Kp4mGEG+ydwLGPvwB92hhnz8h/NtJBWA2pXHNx+LFPFsB96RhygpX5cVEgmIvdHm0H+LCA3QBaADuS93z6d9AShBXJKwNuSLFAIjh7Cf8yoh6ci9Rt6i2VJ+VGyLGI3aYZ6w0yh9hH7K60GR54cboTmLHDu9lseZgyjZ2oalFceEa5GCX0QLHI3jh//xh4AFsITHdS+A+4/6IsSLHBL9h/eBhtXxj2CmHbaAeqtpE7MLHHvNh/Y5mSysyhNdhzaY6s+pvJALEy2Yh/XhmYCiVCLlzajAfEUWMguLEj3+h7jxmylCaVx37i3CWhpKWGILHErYh+hLwpIAHKG/QvnEdrODw6sLE5vsB8BHX9NB25jtw6yoWe/UuZMLEybQh6IrFm8zIPTe21TSd/RFaRoLEJvJhwgmctbkYBzLxzCI6iy0zL8LJBvjh4A+iT5BpUAXCPIgfPM/IoSLEkXrBwpm0brz3YZ5x2WjOtfJk1ILExHsh4JWJcFQhJ3G41WLeLxbOKELE8qvA8BFAh7Ayu/n3/QC3K6RziALGKjUBaQuYJNIf5SNlefkelZXdHKLEy0vBtJmTNtYwes7vyXUdPSa1IILClTUBwgSGp6STlsv9t2gH+kDWbALB4PvB0gABKm+hImnwV8APqdZESqLB4IvBwiYBAhMgCdOI3iAuM0M/bcLCnCvB4QkfzIOj5Yftvqne8ThXnaLBsyTh4AUxcAN1m1NHPfErnshny2LDCBjgtRngH0Uyp4vUqxCedYHn90LCgMtBhiCgXGoodefNWyYaHqE1/GLFHvwBxs1jRSisWI+Vp6yeSdnGcuLGLBNB6SAOpfVpFSl0N7MXVJmqayLGPvjB6wCd4Q9vtkrtWPMiiRFjsCLGPvOB4Qg3veV9o4e2WWCbLSuk8ELGOECB6KEKtFRBGWUxK3LevJNWNsLDj1Qg8DHsdbgDDcuKsSBt3JWOLKLGV4qBbDB43Kki7adLuXgfkNHV9gLCr1iB4BRtTwEyKynSE0RzQ3s35WLGBvnBaBjyYapz557a1MCOHUmyCYLGD1dBpADZckjEm83UZiGeWnvJZ4LFJvjh4D3MIUo6KETiRNJunrai7YLCz35g0gTwoylAWad+JWYfAq4NZcLBd4nB4J9jShLvlUXxQHARomefucLFF4QB4MOzYBfitFH8zyWcHoYidOLCyunA0kJsYb5+X82pWrMOxfPU8MLCrgThwhJtS4f/4l/gGyAeN08Xlo'); }; E('#base64-audio5 > button').onclick = function () { playAmrToWav('IyFBTVIKLEWGYIDYAbvFOH2GfsiOIegRLMIqLEkrjgtAHkTQivDmfVM1jaNZEngILE2GwAPEmHx5NDk7pUNLUfWYUsHoLEgkjgtMXPPQwhrzXi7BBeVsCTl8LCwkwAeF+DQZtU6aHy/oi85xm48+LEQZTg8IfgSxFs8MTWkmTJnCiVeQLAmWQA8DcwJqRyWK6D1JXNiGT1/kLCCtjhwg/i4HQxYBTh/FyL0c4PKGLEOUnB8ECWzBtivj/o0uCKBOSVwaLERviBwjOO1SQyDHHShqp6v5ntQ6LIK0jpaN20m16Ebxbex+FST/0L6cLESbnFiime8ELtBDikj7R/v6kpIGLJAYHB7i/IW3MtgZjH8HkdlbX+rQLENADj2QDXL1/KDsHpJRFQkItcEKLJA/slqjGeHpl6LdmIvkg+s3mzP6LGgYHB9gmUS7M7dqXkMDBu1gS3xCLE8Rhw5pGcJiYMXkGiFCKV12SAZSLEwYsh+gnLQ+jtRY/HnRKOJ9ze1kLGiksh/A3DJFpp97NdhcYOKEjY5wLEzDnJdhDXHBDiasPfK6kXn+4t5mLE7bjh9gmT5rYfVsrppPiaj1HjgMLE1TnB9APIbLx4jNHneWgW2iXYYqLE5vjhfiHD5ogLu4T3Qa1UbBahXaLEBHsh6D2gTTLIciRh0Tpc+iVlQILEXtmh8COJcs4kOVfNmoU5JsVakWLEPtnBygeMf3F/mGHbA4xUxe72hsLCGWTh9CmefiloFgDeKuKaG3U4vkLEQknB4Jmfbed4B0/leEBU/3kXvOLEJyKBaNmWa/9pZULJ81ybNlqQb6LEgkjh8gaDKMxnuUHlamQX/UemkgLGWM6DzrvLaw9ebQvsl/gdtq1JVWLCVtgjxUVJO9VBapXB2CoWXvVa/8LDnZJSyf4Znt7JhPhFcGNQkWclhWLEf8SrVegZylvp9g/P9iEfJEy2sMLFPiJlu/oZtTz7VSzkGsmayKKCI2LGj1tUq/AeNOQtTJFTOCiXV0GGHWLGnvsJd+IeH39jqHTLSmjH1C2snKLHHv4HmegeNZxtdQlaUmIOCZyX4wLHChQh//QeH78fuffDEfFMIdocpYLHL3sNMeAfyyNI/qrA/44/JuLMHoLGL3ZD3eAftY11c1zoJeCdUn+ZpCLDg3sQ7JYftF3HPDP3auAcW0WiZkLCJ+sQ6pQf4RnasrvNEKJ5s40NxcLCAIZB6A5gGVfxsG9sOqAfc7gMw4LFMysFs/4fn0bfPqpmi6mbIWK2omLGHFsDzfoeH57frW/nVSBeW7sw1SLHC2sB/+gf4KBCfzZDSiQ+FiwAWeLHChZFu8Yf4CAv0J7YaLhfD1Kc5wLGj1Yh/+Af4JgOOVnw24C9XHhTbgLHA3ZlucI1YTA1YhRKbfZWmjQG4GLEXi+h77RgYYGNtb7iRzAdw7Mf0CLET1Zh9YZgYKQ6qozI+HQeM5POxSLCC34B4JZgH//Xxs/OO+CMCjccKmLCAIQh5VpgYXGIywl1bGIXTHhEu2LBC3nB4Q5gYGnzAZXdrSgeYC41nQLBI3Th8VpgSt7jMBfSbnAe6zPABOLGM7bFr2ydSww/fk+ePQwf/X+VYaLCSiGpZvwbHzoToBnwgKgddS66KSLFE63D1f4eYZgmApz3eOkW/afFkWLFE6bB/+weYPiAEhftcYIeX2lmloLGPirnmf4eYVisIZlyMPAem2lJS0LHBy4B//IeNfx/SG1hbHGMy0DU3CLHBHjlu/of4SFgJQVFVnEXEMEpbmLE/vQw7/Qf4GEDIElOy+AazKCmUSLHD3Qw7+Af4MEBP6j0a6Be1yedHWLHHv6h/+Af4WACEjvKfQceEY8sEULHHv+lu6QftCQZDpVJR7IOd2sYNiLFKhZB//gf4ACvIuNAHXELqcgNS+LCznwB94Yf4Lmhp8Pkv2BONMt81ALAg3QBpg4f5PP/cInjSSJOiLlENqLEgQsh4AJKN/JSH6Hh4fBfrq6VNiLDgINy1e9N87K86T5Mu7wW+R/nk8LGI3jh//Ae4LTm/T3FOAIcIHxtpQLHF4Nh/+Qf4ag1ujnf9hBfkSJZkmLHA3sDzeg1YdBQVhDh6axe/mTwV6LHA3+h/+RgYCgTiVGsvQ85+CFtZ8LGj1+h/+Rh4UAJIz+GmGA5QbaGCKLEz1Zh+vBh4Ww+AXHGnGkGXA8FQSLEeNZB9F5mYaEsVjng1CmNsYOQ0GLCPiph9YZmS6t2o6Th444dYr84ZcLCFYjh8C5mZMnzUftDD8sb4L0wk6LBPFnB6DRmz1Dph11WBSjOEpk8ueLBNYQB4Bzu6e35l5TZ9qpclry2LaLCFBnB5Bnr4IDlr4Pb4qEf4/qJsSLGhyBB7HPT5pb39wvZUQUc5NLbxqLC1/yw+xjFPJX0E//vN2E2kVmTS6LCM6mNIDsbN3OgRHU/BzBMX6OmvALGHibB/+Qfn6abmkhnbOhfovgqOQLGPi4Q7/IftOTzLn3uf0sawJS0OQLHBHdD3fYftcQZSEb6wKKKjC2jiiLHBHZD3eof4Ql0lIXoc1C75mc1oULHHv6h/+Af4fkYLdGY2JRMRNCIBULHHvZB/vJgHmcp873cJDAW2tJIuALHHv6jzehgYQES00HihqIWWzwgYWLGLn+j0SxgYMAY3VBX1+g8imEVLALGL1+h6vBgS0Iem3VWWfAeFaF+EQLC3F+h4ZZgNe2VBMP27GA/e8v06aLBA3nBegxgNJHiY9bgG/EbphGXByLGl/jh4pvxyn4Riq08nWCOZzk3toLDjuNlsqIb5UeraZ0UNCI6EYSwyCLHF4aB/eBgSiLO287OZxEW1ZBp0WLHI3Nh+/JgHk817e1asBB6EboLEsLHI39h//JgYJlqVeukAyafhOBVJ8LHMr+w7+Bh4KGGPatxPTEdQqWAGCLHCh+h7eJh4WyciYS75Po7shUB28LHBHZh++BmYYEi7lHLxEgv346t5sLGJHIh+aRmYOgd8FyxBjAvIwiPU4LFKvph6Upn4WBia/vxxyEe9CnK8yLESvZB5BRn4jEjbY/d5MMuNlqKXoLC3i6h4IZ4m20DWvHFrYVq8Bi28aLEQPZBaB3mH2J4zknPGENONyjJT+LCGZnB4QLliTV/i7nTF8sbKy1A8MLEwRTg8ADjcZJqtE9rS1IfoGqHBwLHeQ2DxO+cau6HDn+WlSKOGm+FJsLC3mHGGGIeYyjHL5fHiuQ9Ct/WtMLGHiGw5v+fym2X4n7DQdFRpXBNo+LHFhhQ7/w1YTTkUfG5nPA8Y8Qt02LHJyjh//hgNMVnZ7aLk+wfmcYjUQLHJHZD3fBgYEGsz5eQbaMa0Qw4ciLHPvwB/+BgYKk0i6PgzpBW8IKaVOLHPvZB/+BgNP27ekLnXQsfsaN8VKLHK2Zh7+Bhy0KiZV+pDRLX3yYKAcLHPvph++Bh4EFrS93Kp4mGEG+ydwLGPvwB92hhnz8h/NtJBWA2pXHNx+LFPFsB96RhygpX5cVEgmIvdHm0H+LCA3QBaADuS93z6d9AShBXJKwNuSLFAIjh7Cf8yoh6ci9Rt6i2VJ+VGyLGI3aYZ6w0yh9hH7K60GR54cboTmLHDu9lseZgyjZ2oalFceEa5GCX0QLHI3jh//xh4AFsITHdS+A+4/6IsSLHBL9h/eBhtXxj2CmHbaAeqtpE7MLHHvNh/Y5mSysyhNdhzaY6s+pvJALEy2Yh/XhmYCiVCLlzajAfEUWMguLEj3+h7jxmylCaVx37i3CWhpKWGILHErYh+hLwpIAHKG/QvnEdrODw6sLE5vsB8BHX9NB25jtw6yoWe/UuZMLEybQh6IrFm8zIPTe21TSd/RFaRoLEJvJhwgmctbkYBzLxzCI6iy0zL8LJBvjh4A+iT5BpUAXCPIgfPM/IoSLEkXrBwpm0brz3YZ5x2WjOtfJk1ILExHsh4JWJcFQhJ3G41WLeLxbOKELE8qvA8BFAh7Ayu/n3/QC3K6RziALGKjUBaQuYJNIf5SNlefkelZXdHKLEy0vBtJmTNtYwes7vyXUdPSa1IILClTUBwgSGp6STlsv9t2gH+kDWbALB4PvB0gABKm+hImnwV8APqdZESqLB4IvBwiYBAhMgCdOI3iAuM0M/bcLCnCvB4QkfzIOj5Yftvqne8ThXnaLBsyTh4AUxcAN1m1NHPfErnshny2LDCBjgtRngH0Uyp4vUqxCedYHn90LCgMtBhiCgXGoodefNWyYaHqE1/GLFHvwBxs1jRSisWI+Vp6yeSdnGcuLGLBNB6SAOpfVpFSl0N7MXVJmqayLGPvjB6wCd4Q9vtkrtWPMiiRFjsCLGPvOB4Qg3veV9o4e2WWCbLSuk8ELGOECB6KEKtFRBGWUxK3LevJNWNsLDj1Qg8DHsdbgDDcuKsSBt3JWOLKLGV4qBbDB43Kki7adLuXgfkNHV9gLCr1iB4BRtTwEyKynSE0RzQ3s35WLGBvnBaBjyYapz557a1MCOHUmyCYLGD1dBpADZckjEm83UZiGeWnvJZ4LFJvjh4D3MIUo6KETiRNJunrai7YLCz35g0gTwoylAWad+JWYfAq4NZcLBd4nB4J9jShLvlUXxQHARomefucLFF4QB4MOzYBfitFH8zyWcHoYidOLCyunA0kJsYb5+X82pWrMOxfPU8MLCrgThwhJtS4f/4l/gGyAeN08Xlo'); }; function playAmrToWav(amrStr) { if (null != src) { src.stop(); src = null; } var amrStr = window.atob(amrStr), result = new Uint8Array(amrStr.length); for (var i = 0, l = amrStr.length; i < l; i++) { result[i] = amrStr.charCodeAt(i) } playAmrArray(result); } E('#audio-file').onchange = function () { convertAudioBlobToAmr(this.files[0]); }; var gAudioContext = new AudioContext(); function getAudioContext() { if (!gAudioContext) { gAudioContext = new AudioContext(); } return gAudioContext; } function fetchBlob(url, callback) { var xhr = new XMLHttpRequest(); xhr.open('GET', url); xhr.responseType = 'blob'; xhr.onload = function () { callback(this.response); }; xhr.onerror = function () { alert('Failed to fetch ' + url); }; xhr.send(); } function readBlob(blob, callback) { var reader = new FileReader(); reader.onload = function (e) { var data = new Uint8Array(e.target.result); callback(data); }; reader.readAsArrayBuffer(blob); } function fetchAndReadBlob(url, callback) { fetchBlob(url, function (blob) { readBlob(blob, callback); }); } function playAmrBlob(blob, callback) { readBlob(blob, function (data) { playAmrArray(data); }); } function convertAudioBlobToAmr(blob) { readBlob(blob, function (data) { var ctx = getAudioContext(); ctx.decodeAudioData(data.buffer, function (audioBuffer) { var pcm; if (audioBuffer.copyFromChannel) { pcm = new Float32Array(audioBuffer.length); audioBuffer.copyFromChannel(pcm, 0, 0); } else { pcm = audioBuffer.getChannelData(0); } var amr = AMR.encode(pcm, audioBuffer.sampleRate, 7); playAmrArray(amr); }); }); } function playAmrArray(array) { var samples = AMR.decode(array); if (!samples) { alert('Failed to decode!'); return; } playPcm(samples); } var src = null; function playPcm(samples) { var ctx = getAudioContext(); src = ctx.createBufferSource(); var buffer = ctx.createBuffer(1, samples.length, 8000); if (buffer.copyToChannel) { buffer.copyToChannel(samples, 0, 0) } else { var channelBuffer = buffer.getChannelData(0); channelBuffer.set(samples); } src.buffer = buffer; src.connect(ctx.destination); src.start(); } function convertAmrBlobToWav(blob) { readBlob(blob, function (data) { var buffer = AMR.toWAV(data); E('pre').textContent = toHex(buffer); var url = URL.createObjectURL(new Blob([buffer], {type: 'audio/x-wav'})); // Play wav buffer var audio = new Audio(url); audio.onloadedmetadata = audio.onerror = function () { URL.revokeObjectURL(url); }; audio.play(); }); } function toHex(buffer) { var str = ''; for (var i = 0; i < buffer.length; i++) { var s = buffer[i].toString(16); if (s.length == 1) { s = '0' + s; } str += s; if (i % 16 == 15) { // print 16 bytes per line str += '\n' } else if (i % 2 == 1) { // add a space seperator every two bytes. str += ' '; } } return str; } </script> </body> </html>