Widevine和PlayReady的多重DRM工作流程 multi-drm-workflow-for-widevine-and-playready

Last update: Thu Sep 21 2023 00:00:00 GMT+0000 (Coordinated Universal Time)

此多DRM工作流程會帶您完成設定、封裝、授權及播放使用Widevine和PlayReady加密的DASH內容。

Primetime TVSDK僅支援TVSDK 2.X版在HTML5和Android上播放Widevine加密或PlayReady加密的DASH內容。DASH內容加密由「一般加密」規格定義，其完整詳細資訊不在本檔案的範圍之內。本節提供DASH格式和加密規格的相關詳細資訊，以及您可以用來產生支援內容的某些工具的資訊。

NOTE

尚未計畫將Widevine加密的DASH內容回傳至Android TVSDK 1.X。

DASH內容與一般加密一覽 section_33A881158F724835B4B89AAE97302B17

虛線內容包含以xml撰寫的主要資訊清單，指向要播放的視訊和音訊檔案。在以下範例中，DASH資訊清單指向相對於資訊清單URL的視訊URL video/1080_30.mp4和音訊URL audio/1080_30.mp4。

<MPD xmlns="urn:mpeg:DASH:schema:MPD:2011" xmlns:cenc="urn:mpeg:cenc:2013" xmlns:scte35="urn:scte:scte35:2013" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"mediaPresentationDuration="PT30S" minBufferTime="PT8S" profiles="urn:mpeg:dash:profile:isoff-on-demand:2011" type="static" xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 DASH-MPD.xsd">
    <Period id="1" start="PT0S">
        <AdaptationSet bitstreamSwitching="true" contentType="video" id="1" segmentAlignment="true" startWithSAP="2">
            <Representation bandwidth="4215100" codecs="avc1.4d4029" height="1080" id="1" mimeType="video/mp4" width="1920">
                <BaseURL>video/1080_30.mp4</BaseURL>
                <CueInfo schemeIdUri="urn:adobe:mpeg:dash:cueinfo:2012"/>
            </Representation>
        </AdaptationSet>

        <AdaptationSet bitstreamSwitching="true" contentType="audio" id="2" segmentAlignment="1" startWithSAP="1">
            <Representation bandwidth="320600" codecs="mp4a.40.02" id="1" mimeType="audio/mp4">
                <BaseURL>audio/1080_30.mp4</BaseURL>
                <CueInfo schemeIdUri="urn:adobe:mpeg:dash:cueinfo:2012"/>
            </Representation>
        </AdaptationSet>
    </Period>
</MPD>

以下是套用一般加密的範例資訊清單。 Widevine內容保護XML元素( <ContentProtection> 資訊清單中的區塊包含base64編碼的pssh （保護系統專屬標頭）方塊。 pssh方塊包含初始化內容解密所需的資料。此資料也內嵌在資訊清單參照的視訊/音訊內容中。 DASH內容可以有多個內容保護元素，例如1表示PlayReady，1表示Widevine。

<?xml version="1.0" ?>
<MPD mediaPresentationDuration="PT3M35.533S" minBufferTime="PT15.00S" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" xmlns="urn:mpeg:dash:schema:mpd:2011" xmlns:cenc="urn:mpeg:cenc:2013">
  <!-- Created with Bento4 mp4-dash.py, VERSION=1.6.0-607 -->
  <Period>
    <!-- Audio -->
    <AdaptationSet mimeType="audio/mp4" segmentAlignment="true" startWithSAP="1">
      <!-- Common Encryption -->
      <ContentProtection cenc:default_KID="9e828b37-842d-9f71-0233-c007fb1d4f5b" schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc"/>
      <!-- Widevine -->
      <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">
        <cenc:pssh>
        AAAAQ3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACMIARIQnoKLN4Qtn3ECM8AH+x1PWxoKaW50ZXJ0cnVzdCIBKg==
        </cenc:pssh>
      </ContentProtection>
      <Representation audioSamplingRate="44100" bandwidth="200429" codecs="mp4a.40.2" id="audio/und">
        <AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
        <SegmentList duration="15000" timescale="1000">
          <Initialization sourceURL="audio/und/init.mp4"/>
          <SegmentURL media="audio/und/seg-1.m4f"/>
          <SegmentURL media="audio/und/seg-2.m4f"/>
          <SegmentURL media="audio/und/seg-3.m4f"/>
          <SegmentURL media="audio/und/seg-4.m4f"/>
          <SegmentURL media="audio/und/seg-5.m4f"/>
          <SegmentURL media="audio/und/seg-6.m4f"/>
          <SegmentURL media="audio/und/seg-7.m4f"/>
          <SegmentURL media="audio/und/seg-8.m4f"/>
          <SegmentURL media="audio/und/seg-9.m4f"/>
          <SegmentURL media="audio/und/seg-10.m4f"/>
          <SegmentURL media="audio/und/seg-11.m4f"/>
          <SegmentURL media="audio/und/seg-12.m4f"/>
          <SegmentURL media="audio/und/seg-13.m4f"/>
          <SegmentURL media="audio/und/seg-14.m4f"/>
          <SegmentURL media="audio/und/seg-15.m4f"/>
          <SegmentURL media="audio/und/seg-16.m4f"/>
        </SegmentList>
      </Representation>
    </AdaptationSet>

    <!-- Video -->
    <AdaptationSet maxHeight="720" maxWidth="1280" mimeType="video/mp4" minHeight="720" minWidth="1280" segmentAlignment="true" startWithSAP="1">
      <!-- Common Encryption -->
      <ContentProtection cenc:default_KID="9e828b37-842d-9f71-0233-c007fb1d4f5b" schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc"/>
      <!-- Widevine -->
      <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">
        <cenc:pssh>
        AAAAQ3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAACMIARIQnoKLN4Qtn3ECM8AH+x1PWxoKaW50ZXJ0cnVzdCIBKg==
        </cenc:pssh>
      </ContentProtection>

      <Representation bandwidth="2640920" codecs="avc1.64001F" frameRate="30" height="720" id="video/1" scanType="progressive" width="1280">
        <SegmentList duration="15000" timescale="1000">
          <Initialization sourceURL="video/1/init.mp4"/>
          <SegmentURL media="video/1/seg-1.m4f"/>
          <SegmentURL media="video/1/seg-2.m4f"/>
          <SegmentURL media="video/1/seg-3.m4f"/>
          <SegmentURL media="video/1/seg-4.m4f"/>
          <SegmentURL media="video/1/seg-5.m4f"/>
          <SegmentURL media="video/1/seg-6.m4f"/>
          <SegmentURL media="video/1/seg-7.m4f"/>
          <SegmentURL media="video/1/seg-8.m4f"/>
          <SegmentURL media="video/1/seg-9.m4f"/>
          <SegmentURL media="video/1/seg-10.m4f"/>
          <SegmentURL media="video/1/seg-11.m4f"/>
          <SegmentURL media="video/1/seg-12.m4f"/>
          <SegmentURL media="video/1/seg-13.m4f"/>
          <SegmentURL media="video/1/seg-14.m4f"/>
          <SegmentURL media="video/1/seg-15.m4f"/>
        </SegmentList>
      </Representation>
    </AdaptationSet>
  </Period>
</MPD>

請注意，上述第一個範例僅參照每個資料流的一個檔案，而第二個範例則參照一系列小型內容片段。您也可以定義片段範本，而不是明確提及片段，例如：

<Representation bandwidth="348000" codecs="avc1.42c01e" height="360" id="1" width="640">
    <BaseURL>video/</BaseURL>
    <SegmentTemplate initialization="JaigoInit.mp4" media="Jaigo$Number$.m4s" startNumber="0" timescale="1000">
        <SegmentTimeline>
            <S d="4538" t="0"/>
            <S d="4304" t="4538"/>
            <S d="4004" t="8842"/>
            <S d="2102" t="12846"/>
        </SegmentTimeline>
    </SegmentTemplate>
</Representation>

在此案例中，內容剖析器(TVSDK)預期會在Jaigo0.m4s、Jaigo1.m4s、Jaigo2.m4s等找到視訊內容。這主要用於即時串流，並且具有不需要使用者端不時再次下載資訊清單的優勢。

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