DASH + Widevine get the default_KID present on the manifest

Hi we’re using ExoPlayer to play MPEG-DASH content protected with Widevine DRM.

Everything is working great, but now as a new requisite we have to send the default_KID that is present on the content manifest to the Widevine License Server.

Is there a away to get this value when executeKeyRequest is called?

Here is the part of one of the manifesst:

<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="urn:mpeg:dash:schema:mpd:2011"
     xmlns:xlink="http://www.w3.org/1999/xlink"
     xmlns:cenc="urn:mpeg:cenc:2013"
     xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd"
     profiles="urn:mpeg:dash:profile:isoff-live:2011"
     type="static"
     publishTime="2016-03-15T16:25:30Z" 
     mediaPresentationDuration="PT1H54M34.112S"
     minBufferTime="PT1.5S">
<ProgramInformation>
    <Title>media/Vods/LM-2921648/Main/2921648_SD_H.smil</Title>
</ProgramInformation>
<Period id="0" start="PT0.0S">
    <AdaptationSet id="0" mimeType="video/mp4" maxWidth="720" maxHeight="400" frameRate="25" segmentAlignment="true" startWithSAP="1" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
        <ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc" cenc:default_KID="701a9f48-5fc4-467f-b4a9-d417d97b5be1"/>
        <ContentProtection schemeIdUri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed" value="Widevine">
            <cenc:pssh>AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEHAan0hfxEZ/tKnUF9l7W+E=</cenc:pssh>
        </ContentProtection>
        <SegmentTemplate presentationTimeOffset="0" timescale="90000" media="chunk_ctvideo_cfm4s_rid$RepresentationID$_cs$Time$_mpd.m4s" initialization="chunk_ctvideo_cfm4s_rid$RepresentationID$_cinit_mpd.m4s">
            <SegmentTimeline>
                <S t="0" d="900000"/>
                <S d="900000"/>
                <S d="900000"/>
...

Thanks in advance.

Issue Analytics

State:
Created 8 years ago
Comments:13 (5 by maintainers)

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1reaction

ojw28commented, May 11, 2017

I still think the setup being described here is pretty unnecessary. There definitely exist cleaner solutions to this problem. I thought the CENC PSSH data is sent up as part of the license request. If the KID is contained within the PSSH data as implied above, why can’t the server just parse and extract it from what’s already being sent?

The above aside, it’s a little unclear how your current implementation works. What are you actually doing in onLoadStarted currently? Specifically, where are you getting the manifest from? If you’re getting it from ExoPlayer.getCurrentManifest then you should probably use the ExoPlayer.onTimelineChanged callback instead, since this is the earliest point at which the manifest can be retrieved from that method.

I don’t think we want to make hard guarantees about the ordering, however, so this is still risky. The only guaranteed way to get data from the manifest before the key request is made would be to extend DashManifestParser and retrieve what you need during the actual parsing. You can inject your extended/custom parser into DashMediaSource constructors.

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jrocharodriguescommented, May 16, 2017

Ok @ojw28, i’ll do that.

Thanks for your help.

BRs