How to enable external clear key in android on chrome browser

[pujari gupta]

Hi,
I want to enable external clear key on android on chrome browser .

Currently the clear play is happening with the default provided with the browser.

Anybody can hep me on this....


Thanks
Pujari

[pujari gupta]

Any one can please help me on this.

[Chris Cunningham]

Adding some EME folks.

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[Xiaohan Wang (王消寒)]

Hello Pujari,

Could you please provide more details on why you'd prefer External Clear Key to normal Clear Key key system that's supported natively in the browser? External Clear Key is added only for testing purposes and there's not plan to enable it in production so far.

Best,

Xiaohan

[pujari gupta]

Hi Xiaohan,
My whole idea is to have OCDM and CDMi like things on android.
But in Android I have read from the blogs we already have the Media Drm support, so OCDM and CDMi pepper plugins are only supported for ubuntu.
And a default clearkey plug-in is also available in android framework.

Now I have build the chromium for android but when playing clearkey content its uses native clearkey so I want to use the clear key provided in the android frame work to understand code flow and the changes required in order to do so.

Though I know it won't be a easy job for me .

Thanks
Pujari

[Xiaohan Wang (王消寒)]

Thanks for the explanation! Now I get it.

I don't know much about OCDM and CDMi. Do you have more details on them?

You are right that Android MediaDrm should support Clear Key. And we do have a plan to enable it for test-only: https://bugs.chromium.org/p/chromium/issues/detail?id=721935. But we haven't got a chance to work on it given low priority. Note that we do not want to use it in production for security and performance issues.

Also, today External Clear Key on Android is supported by running AesDecryptor in the (remote) GPU process:

https://cs.chromium.org/chromium/src/media/base/android/android_cdm_factory.cc?rcl=8920316be144bf00badff5c1cdb388aecc43995b&l=66

You can comment this out, and always create MediaDrmBridge for External Clear Key key system, then update MediaDrmBridge to support Clear Key. It requires some work but shouldn't be too hard I guess.

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[pujari gupta]

Hi Xiaohan,
Thanks for replying.

I am trying to do those changes.

And also what i understand that Android DRM framework uses key UUID rather then key systems to load specific drm, so i understand i need to do those changes in chrome.

But as I am not too much familiar with the chrome code , i am struggling right.

in case you do have any idea it will be really helpful.

And I will keep you updated with my changes in progress.


Thanks
Pujari

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[Xiaohan Wang (王消寒)]

On Thu, Jan 11, 2018 at 4:38 AM, pujari gupta <pujari...@gmail.com> wrote:

Hi Xiaohan,

Thanks for replying.

I am trying to do those changes.

And also what i understand that Android DRM framework uses key UUID rather then key systems to load specific drm, so i understand i need to do those changes in chrome.

You need to add a UUID/KeySystem mapping for the conversion:

https://cs.chromium.org/chromium/src/media/base/android/media_drm_bridge.cc?rcl=58d68fdf783d7edde1c82a642e037464861f2787&l=174 

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[pujari gupta]

Hi Xiaohan,
For simplicity to debug I have added the UUID of mockDrm inside chromium source where you have pointed :

File : src/media/base/android/media_drm_bridge.cc :

//Code snippet

const char kExternalClearKey[] = "org.chromium.externalclearkey"; // PUJARI


const uint8_t kMockDrmUuid[16] = {
    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,  //
    0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10};  // PUJARI

KeySystemManager::KeySystemManager() {
  // Widevine is always supported in Android.

  key_system_uuid_map_[kWidevineKeySystem] =
      UUID(kWidevineUuid, kWidevineUuid + arraysize(kWidevineUuid));

  key_system_uuid_map_[kExternalClearKey] =
      UUID(kMockDrmUuid, kMockDrmUuid + arraysize(kMockDrmUuid));
  MediaDrmBridgeClient* client = GetMediaDrmBridgeClient();
  if (client)
    client->AddKeySystemUUIDMappings(&key_system_uuid_map_);
}
**************************************************************



File : src/media/base/android/android_cdm_factory.cc


commented :



//  if (base::FeatureList::IsEnabled(media::kExternalClearKeyForTesting) &&
 //     IsExternalClearKey(key_system))

// N.B => I have given a log here , it seems log is not getting printed may be code is not coming here.
{


*********************************************

But when I am playing the clear key , its still pointing to the default clear key.

Mu understanding is It should load the MockDrm and fail to play the clear key stream.

Please correct me if my understanding is wrong.

Thanks
Pujari

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[Xiaohan Wang (王消寒)]

On Fri, Jan 12, 2018 at 5:41 AM, pujari gupta <pujari...@gmail.com> wrote:

Hi Xiaohan,

"External Clear Key" is a test key system with string "org.chromium.externalclearkey". This is only used for testing in Chromium.

"Clear Key" is a key system defined by the EME spec with the key system string "org.w3.clearkey". It's supported by many browsers including Chromium.

So, for your testing, are you using Clear Key, or External Clear Key?

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[pujari gupta]

I am using dash js player for testing the external key , I guess it's using clear key perhaps.

But I have also tried the EME html player inside test folder of chromium where we have the external clear key option but I was not able to play any video.

> To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/chromium-dev/b4849ac7-0c6d-4a62-9cca-7fa31872103f%40chromium.org.