Support parsing of license server URL from DASH manifest #3393

ARKMe · 2017-10-24T15:22:27Z

I'm trying to play a DASH video with Widevine DRM provided by Azure.
In the manifest, inside the ContentProtection node, I receive: <ms:laurl licenseUrl="XXXXXX" />, but DashManifestParser doesn't parse that node. I'd prefer avoiding to download and parse the video manifest to get the licenseUrl, is there another way to achieve this?

ojw28 · 2017-11-01T18:24:39Z

Can you please provide the full manifest, so we can see what's provided there? The url may be provided in more than once place (possibly in encoded form). What happens if you pass defaultLicenseUrl == null to HttpMediaDrmCallback constructor?

workspace · 2017-11-17T06:56:58Z

@ARKMe my service uses Azure Media Service too.
We faced the same problem with your cases, and we solved it with custom DashManifestParser and CustomDashManifest.

AzureDashManifest

public class AzureDashManifest extends DashManifest {

  public final String drmLicenseUrl;

  public AzureDashManifest(long availabilityStartTime, long duration, long minBufferTime,
                           boolean dynamic, long minUpdatePeriod, long timeShiftBufferDepth,
                           long suggestedPresentationDelay, UtcTimingElement utcTiming,
                           Uri location, String drmLicenseUrl, List<Period> periods) {
    super(availabilityStartTime, duration, minBufferTime, dynamic, minUpdatePeriod,
        timeShiftBufferDepth, suggestedPresentationDelay, utcTiming, location, periods);
    this.drmLicenseUrl = drmLicenseUrl;
  }
}

AzureDashManifestParser

// abstract code
public class AzureDashManifestParser extends DashManifestParser {

  private String drmLicenseUrl = null;

  @Override
  protected AzureDashManifest buildMediaPresentationDescription(...) {
    return new AzureDashManifest(availabilityStartTime, durationMs, minBufferTimeMs,
        dynamic, minUpdateTimeMs, timeShiftBufferDepthMs, suggestedPresentationDelayMs, utcTiming,
        location, drmLicenseUrl, periods);
  }
  @Override
  protected DrmInitData.SchemeData parseContentProtection(XmlPullParser xpp) throws XmlPullParserException,
      IOException {
...
      } else if (XmlPullParserUtil.isStartTag(xpp, "ms:laurl")) {
        drmLicenseUrl = xpp.getAttributeValue(null, "licenseUrl");
      }
...
}

Then you can use it with following steps below

load manifest with custom classes for Azure (in background thread)

public static AzureDashManifest loadManifest(DataSource dataSource, Uri uri)
		throws IOException {
		DataSpec dataSpec = new DataSpec(uri,
			DataSpec.FLAG_ALLOW_CACHING_UNKNOWN_LENGTH | DataSpec.FLAG_ALLOW_GZIP);
		ParsingLoadable<DashManifest> loadable = new ParsingLoadable<>(dataSource, dataSpec,
			C.DATA_TYPE_MANIFEST, new AzureDashManifestParser());
		loadable.load();
		return (AzureDashManifest) loadable.getResult();
	}

initialize drm session manager with parsed manifest.

String drmLicenseUrl = manifest.drmLicenseUrl;
Map<String, String> keyRequestProperties = new HashMap<>();
keyRequestProperties.put("Authorization", String.format("Bearer=%s", token));
drmSessionManager = buildDrmSessionManager(drmLicenseUrl, keyRequestProperties);
// then initialize player with this drm session manager.

build media source with sideloaded manifest. you can reuse manifest to build media source.

videoSource = new DashMediaSource(
    manifest, new DefaultDashChunkSource.Factory(mediaDataSourceFactory), mainHandler, null
);

workspace · 2017-11-17T07:07:53Z

@ojw28
As you can see from the exoplayer demo, I need to know the drm license url in the step of initializing the player. However, in the case of Azure, it is difficult to know the drm license url because it dynamically constructs the manifest. Once I've solved the problem by implementing a custom class like the above answer, is there any better way?

ojw28 · 2017-11-17T13:11:03Z

@AquilesCanta - I think we probably need to add a Uri field to SchemeData, that can be populated in the manifest parser, for this kind of case. Or something like that?

It's somewhat unclear what preference should be given to that Uri vs the one from KeyRequest.getDefaultUrl though. I think we'd probably need to prefer the one provided by KeyRequest.getDefaultUrl if both are present, since that can be used as a mechanism for redirecting license requests to a heartbeat server.

workspace · 2017-12-11T19:53:03Z

1

codeindream · 2018-02-07T16:15:48Z

+1

AquilesCanta · 2018-02-09T14:09:47Z

Has anyone provided a sample manifest, as requested above?

workspace · 2018-02-09T14:55:52Z

https://educastmedia.streaming.mediaservices.windows.net/ccfa9378-938f-4368-a7e2-f4705e220c4a/video.ism/Manifest(format=mpd-time-csf)

You can download it from link

workspace · 2018-02-13T06:50:12Z

Also, you can get Authorization header by using our service api. This dash source is the one of samples in my service. So it does not require any permission.

Manifest url

https://educastmedia.streaming.mediaservices.windows.net/ccfa9378-938f-4368-a7e2-f4705e220c4a/video.ism/Manifest(format=mpd-time-csf)

DRM optional header token Request url

POST https://educast.com/api/v1/video/80/create_drm_token

Request body example

{
  "drm_type" : 1
}

Response example

{
  "token":"urn%3amicrosoft%3aazure%3amediaservices%3acontentkeyidentifier=2737157b-0c18-4c14-a320-3ab9f2870986&Audience=urn%3aeducast%3ausers&ExpiresOn=1518515102&Issuer=https%3a%2f%2feducast.pro&HMACSHA256=b5uMd%2fsgXlAMm3YctOL9k50xE3bHbV6hTeQygbcieD8%3d",
  "expiration_time":"2018-02-13T18:45:02.810084"
}

Usage example - Put token into HttpDrmCallback Header.

// codes from our android application
HashMap<String, String> keyRequestProperties = new HashMap<>();
keyRequestProperties.put("Authorization", String.format("Bearer=%s", drmToken.token()));
for (String key : keyRequestProperties.keySet()) {
    httpMediaDrmCallback.setKeyRequestProperty(key, keyRequestProperties.get(key));
}
return DefaultDrmSessionManager.newWidevineInstance(httpMediaDrmCallback, keyRequestProperties, handler, null);

Allows DrmInitData to carry a license server URL when the media declares one. Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=199643743

workspace · 2018-06-21T06:03:45Z

@ojw28 I read commit's changes, however, I can't find anything to parse license server url from manifest (e.g. ms:pro(Azure Media Services's Widevine license url label)). Is it still developing?

AquilesCanta · 2018-06-21T08:59:03Z

We haven't implemented the parsing part yet. The manifest urls above seem to have expired, can we get a new one? Aside, it would be great to have some kind of specification for the license server url tags, if possible. Can you provide any of them? Thanks.

AquilesCanta · 2018-06-21T09:02:13Z

Note that at this point, the only required action is to populate the SchemeData in the manifest parser. You can override parseContentProtection and the DrmSessionManager should just pick it up.

workspace · 2018-06-22T02:39:31Z

https://backup-educastmedia.streaming.mediaservices.windows.net/e59257e1-ef8f-4556-a654-1bf3633f1f6d/video.ism/Manifest(format=mpd-time-csf)

But this locator url can be changed soon. So, I attached the content of manifest and brief summary for microsoft's xml tag

Manifest(format=mpd-time-csf).zip

It contains license url like
<ms:laurl licenseUrl="https://educastmedia.keydelivery.mediaservices.windows.net/Widevine/?KID=8f26d4a9-e4d9-4971-aeab-782659471d4a"/>

So, ms:laurl will be target to parse. I already used custom parser which overrides parseContentProtection to pick it up.

AquilesCanta · 2018-06-22T11:42:00Z

Even while using a token I am getting a 401 for the key requests using the provided token:

keyRequestProperties.put("Authorization", String.format("Bearer=%s", "urn%3amicrosoft%3aazure%3amediaservices%3acontentkeyidentifier=b73aac96-9814-4eda-bd81-35a1dd767115&Audience=urn%3aeducast%3ausers&ExpiresOn=1529677294&Issuer=https%3a%2f%2feducast.pro&HMACSHA256=cyKkfWbZCU0n6Wt84ohrE8hMxHX1QAvyJroKjm66g8s%3d"));

Can you help with this? Can you notice anything wrong with the format of the property?

The manifest url is the last one:

https://backup-educastmedia.streaming.mediaservices.windows.net/e59257e1-ef8f-4556-a654-1bf3633f1f6d/video.ism/Manifest(format=mpd-time-csf)

workspace · 2018-06-22T12:22:58Z

Did you get token from
https://educast.com/api/v1/video/80/create_drm_token
?
I think you tried to play with mismatching manifest and drm token because of my mistake. Can you follow below guideline to get valid manifest and drm token pair?
0. Target is our video which pk is 80

GET streaming_url from https://educast.com/api/v1/video/80 response
You can get manifest url by appending some format string (streaming_url) + '(format=mpd-time-csf)'
Then, you can get license url by opening manifest.
Get token from https://educast.com/api/v1/video/80/create_drm_token (POST with body {drm_type : 1})
Follow guideline for playing our video in my previous video again.

Thank you!!

Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=201694813

ojw28 · 2018-06-25T21:43:57Z

I believe this is now fully implemented. @AquilesCanta - Can we close it? Thanks!

AquilesCanta · 2018-06-25T21:48:21Z

Yes, apologies for not doing it before. @KiminRyu, please try it out and let us know if you run into any issues.

Allows DrmInitData to carry a license server URL when the media declares one. Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=199643743

Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=201694813

ojw28 added the need more info label Nov 1, 2017

ojw28 changed the title ~~Opening a DASH video with Widevine DRM without knowing licenseUrl~~ Support parsing of license server URL from DASH manifest Nov 17, 2017

ojw28 added enhancement and removed need more info labels Nov 17, 2017

ojw28 assigned AquilesCanta Nov 17, 2017

AquilesCanta added the need more info label Feb 9, 2018

ojw28 removed the need more info label Feb 12, 2018

ojw28 pushed a commit that referenced this issue Jun 18, 2018

Add license server URL to SchemeData

4bbc93b

Allows DrmInitData to carry a license server URL when the media declares one. Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=199643743

ojw28 pushed a commit that referenced this issue Jun 22, 2018

Parse ms:laurl from ContentProtection in DASH

b031c3d

Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=201694813

AquilesCanta closed this as completed Jun 25, 2018

ojw28 pushed a commit that referenced this issue Jul 23, 2018

Add license server URL to SchemeData

5f79aa2

Allows DrmInitData to carry a license server URL when the media declares one. Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=199643743

ojw28 pushed a commit that referenced this issue Jul 23, 2018

Parse ms:laurl from ContentProtection in DASH

a37bd0d

Issue:#3393 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=201694813

google locked and limited conversation to collaborators Nov 23, 2018

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Support parsing of license server URL from DASH manifest #3393

Support parsing of license server URL from DASH manifest #3393

ARKMe commented Oct 24, 2017

ojw28 commented Nov 1, 2017 •

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workspace commented Nov 17, 2017 •

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workspace commented Nov 17, 2017

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workspace commented Dec 11, 2017

codeindream commented Feb 7, 2018

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workspace commented Feb 13, 2018 •

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workspace commented Jun 21, 2018

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workspace commented Jun 22, 2018

ojw28 commented Jun 25, 2018

AquilesCanta commented Jun 25, 2018

Support parsing of license server URL from DASH manifest #3393

Support parsing of license server URL from DASH manifest #3393

Comments

ARKMe commented Oct 24, 2017

ojw28 commented Nov 1, 2017 • edited Loading

workspace commented Nov 17, 2017 • edited Loading

AzureDashManifest

AzureDashManifestParser

workspace commented Nov 17, 2017

ojw28 commented Nov 17, 2017 • edited Loading

workspace commented Dec 11, 2017

codeindream commented Feb 7, 2018

AquilesCanta commented Feb 9, 2018

workspace commented Feb 9, 2018

workspace commented Feb 13, 2018 • edited Loading

Manifest url

DRM optional header token Request url

Request body example

Response example

Usage example - Put token into HttpDrmCallback Header.

workspace commented Jun 21, 2018

AquilesCanta commented Jun 21, 2018

AquilesCanta commented Jun 21, 2018

workspace commented Jun 22, 2018

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