MPEG-DASH不能用ClearKey解密MP4

我有一个使用MP4Box加密的仅音频MP4文件，命令MP4BOx -crypt drm.xml audio-only.mp4 -out audio-only-enc.mp4

这是drm.xml：

    <GPACDRM type="CENC AES-CTR">
     <DRMInfo type="pssh" version="0">
     <BS ID128="9A04F07998404286AB92E65BE0885F95"/>
     <BS data="application/data;base64:ACE125"/>
     <BS sourceFile="cenc_blob.bin"/>
      </DRMInfo> <DRMInfo type="pssh" version="1" cypherOffset="9" cypherKey="0x6770616363656E6364726D746F6F6C31" cypherIV="0x00000000000000000000000000000001">
      <BS ID128="6770616363656E6364726D746F6F6C31"/>
      <BS value="2" bits="32"/>
      <BS ID128="0x279926496a7f5d25da69f2b3b2799a7f"/>
      <BS ID128="0x676cb88f302d10227992649885984045"/>
      <BS bits="8" string="CID=Toto"/>
      <BS ID128="0xccc0f2b3b279926496a7f5d25da692f6"/>
      <BS ID128="0xccc0f2b3b279926496a7f5d25da692d6"/>
       </DRMInfo>
    <CrypTrack trackID="2" IsEncrypted="1" IV_size="16" first_IV="0x0a610676cb88f302d10ac8bc66e039ed" saiSavedBox="senc">
       <key KID="0x279926496a7f5d25da69f2b3b2799a7f" value="0xccc0f2b3b279926496a7f5d25da692f6"/>
      </CrypTrack>
    </GPACDRM>
Well, now i would to decrypt that file with mpeg-dash. 
In first, i've created .mpd and segmentated that mp4 file.
.Mpd file looks like following:
    <?xml version="1.0"?>
    <!-- MPD file Generated with GPAC version 0.6.2-DEV-rev1147-g47f9373-master  at 2016-12-03T10:37:20.403Z-->
    <MPD xmlns="urn:mpeg:dash:schema:mpd:2011" minBufferTime="PT1.500S" type="static" mediaPresentationDuration="PT0H4M30.118S" maxSegmentDuration="PT0H0M3.994S" profiles="urn:mpeg:dash:profile:full:2011" xmlns:cenc="urn:mpeg:cenc:2013">
     <ProgramInformation moreInformationURL="http://gpac.io">
     <Title>audio-enc.mpd generated by GPAC</Title>
     </ProgramInformation>
     <Period duration="PT0H4M30.118S">
     <AdaptationSet segmentAlignment="true" lang="und">
     <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc" cenc:default_KID="27992649-6a7f-5d25-da69-f2b3b2799a7f"/>
     <Representation id="1" mimeType="audio/mp4" codecs="mp4a.40.2" audioSamplingRate="44100" startWithSAP="1" bandwidth="103460">
     <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
     <SegmentList timescale="44100" duration="176400">
     <Initialization sourceURL="segment_audioinit.mp4"/>
     <SegmentURL media="segment_audio1.m4s"/>
     <SegmentURL media="segment_audio2.m4s"/>
      ....
     <SegmentURL media="segment_audio67.m4s"/>
     <SegmentURL media="segment_audio68.m4s"/>
    </SegmentList>
   </Representation>
  </AdaptationSet>
 </Period>
</MPD>

现在，这是我的页面的html：

 <!doctype html>
    <html>
     <head>
        <title>Dash.js Rocks</title>
        <style>
            video {
                width: 640px;
                height: 360px;
            }
        </style>
     </head>
     <body>
        <div>
            <video id="videoPlayer" controls></video>
        </div>
        <script src="http://cdn.dashjs.org/latest/dash.all.min.js"></script>
        <script src="js/main.js"></script>
        <script>
            (function(){
                var url = "http://localhost:8080/prova-enc/audio-enc.mpd";
                              var player = dashjs.MediaPlayer().create();
                player.initialize(document.querySelector("#videoPlayer"), url, true);
            })();
        </script>
    </body>
</html>

这是" main.js"：

'use strict';
    var KEY = new Uint8Array([
    0x279926496a7f5d25da69f2b3b2799a7f
 ]);
    var config = [{
   initDataTypes: ['mp4'],
   videoCapabilities: [{
   contentType: 'video/mp4; codecs="mp4a.40.2"'
  }]
}];
 var video = document.querySelector('videoPlayer');
 if(video) {
      video.addEventListener('encrypted', handleEncrypted, false);
 }
  navigator.requestMediaKeySystemAccess('org.w3.clearkey', config).then(
   function(keySystemAccess) {
   return keySystemAccess.createMediaKeys();
  }
 ).then(
   function(createdMediaKeys) {
   return video.setMediaKeys(createdMediaKeys);
 }
).catch(
  function(error) {
  console.error('Failed to set up MediaKeys', error);
  }
);
 function handleEncrypted(event) {
  console.log('encrypted event:', event);
 var session = video.mediaKeys.createSession();
 session.addEventListener('message', handleMessage, false);
 session.generateRequest(event.initDataType, event.initData).catch(
  function(error) {
  console.error('Failed to generate a license request', error);
    }
  );
 }

当我从Chrome（版本E 55.0.2883.75（64位））到我的服务器上时，这是控制台的输出：

main.js:29 Failed to set up MediaKeys DOMException: None of the requested configurations were supported.
(anonymous) @ main.js:29
Debug.js:108 [23] EME detected on this user agent! (ProtectionModel_21Jan2015) 
Debug.js:108 [29] Playback Initialized 
Debug.js:108 [49] [dash.js 2.3.0] MediaPlayer has been initialized 
XHRLoader.js:223 XHR finished loading: GET "http://localhost:8080/prova-enc/audio-enc.mpd".
c @ XHRLoader.js:223
d @ XHRLoader.js:256
d @ ManifestLoader.js:83
Q @ StreamController.js:663
Pb @ MediaPlayer.js:1928
Fb @ MediaPlayer.js:1772
Db @ MediaPlayer.js:1736
b @ MediaPlayer.js:169
(anonymous) @ dash1.html:23
(anonymous) @ dash1.html:24
Debug.js:108 [70] Parsing complete: ( xml2json: 10.3ms, objectiron: 4.63ms, total: 0.0150s) 
Debug.js:108 [72] Manifest has been refreshed at Sat Dec 03 2016 16:16:33 GMT+0100 (CET)[1480778193.925]  
Debug.js:108 [82] SegmentTimeline detected using calculated Live Edge Time 
Debug.js:108 [89] MediaSource attached to element.  Waiting on open... 
Debug.js:108 [95] MediaSource is open! 
Debug.js:108 [96] Duration successfully set to: 270.118 
Debug.js:108 [98] Added 0 inline events 
Debug.js:108 [98] No video data. 
Debug.js:108 [99] audio codec: audio/mp4;codecs="mp4a.40.2" 
Debug.js:108 [110] Schedule controller stopping for audio 
Debug.js:108 [115] No text data. 
Debug.js:108 [115] No fragmentedText data. 
Debug.js:108 [116] No embeddedText data. 
Debug.js:108 [116] No muxed data. 
Debug.js:108 [117] Start Event Controller 
Debug.js:108 [120] Schedule controller starting for audio 
Debug.js:108 [122] Native video element event: play 
XHRLoader.js:223 XHR finished loading: GET "http://localhost:8080/prova-enc/segment_audioinit.mp4".
c @ XHRLoader.js:223
d @ XHRLoader.js:256
d @ FragmentLoader.js:96
n @ FragmentModel.js:159
l @ FragmentModel.js:150
o @ ScheduleController.js:260
d @ ScheduleController.js:168
y @ ScheduleController.js:303
(anonymous) @ EventBus.js:87
c @ EventBus.js:87
R @ Stream.js:457
Q @ Stream.js:437
d @ Stream.js:124
b @ StreamController.js:427
Debug.js:108 [128] Init fragment finished loading saving to audio's init cache 
Debug.js:108 [136] DRM: onNeedKey 
Debug.js:108 [136] DRM: initData: /psshy@B«æ[à_
[148] DRM: KeySystem Access Denied! -- Key system access denied!

有人可以帮助我吗？我绝望。

谢谢

您的密钥应该是字节的数组；您的行new Uint8Array([0x279926496a7f5d25da69f2b3b2799a7f])错误地创建了一个单成员数组。相反，您应该将其写为new Uint8Array([0x27, 0x99, 0x26, 0x49, 0x6a, 0x7f, 0x5d, 0x25, 0xda, 0x69, 0xf2, 0xb3, 0xb2, 0x79, 0x9a, 0x7f])。然后，它仍然需要编码为base64格式，然后在JSONWEBKEY中使用。

另外，您永远不会与密钥生成许可证。如果尚未，请参阅此示例页面的源，以获取与ClearKey设置视频的正确方法。将其generateLicense()功能集成到您的代码中（您还需要其toBase64()功能将密钥转换为正确的格式）。实际上，我建议在编写自己的版本之前将该代码在自己的机器上使用。请注意，它需要在安全上下文（例如https）上运行，如果您想使用他们的视频文件，则需要它与应用程序相同（即。您自己的服务器）。

编辑：另外，" domexception：均不支持所请求的配置。"表示您可能错误地编写了config（或环境不支持的指定功能）。不幸的是，我无能为力，因为这里的规范在这里不确定，我本人正在努力。同样，我建议让最低的工作示例首先运行。

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