Offline clear key drm

[mhassanist]

Is there a clear simple way now to implement Clear Key DRM in ExoPlayer 2 ?
I have the keyID and KeyValue and the video URL is online however the keys are stored offline. I just want to set the keys by hand instead of getting them from license server.

[ojw28]

Clarification around ClearKey support is tracked by #3138.

[mhassanist]

I'm able to get the clear key to work if I put the response on the server.
http://ec2-52-42-32-95.us-west-2.compute.amazonaws.com/shaka/shaka_final/request.php

My question is how to set those values on the player without requesting it from online server.

[ojw28]

You will have to implement a MediaDrmCallback that provides a local response.

[mhassanist]

Thanks a lot for your replay.

Do you have or can provide any example or sample code for this ?

[mhassanist]

I made this. But not sure how to return the key value from these methods.

public class MyDRMCallBack implements MediaDrmCallback {
    @Override
    public byte[] executeProvisionRequest(UUID uuid, ExoMediaDrm.ProvisionRequest request) throws Exception {
        return new byte[0];
    }

    @Override
    public byte[] executeKeyRequest(UUID uuid, ExoMediaDrm.KeyRequest request) throws Exception {
        return new byte[0];
    }
}

[ojw28]

I don't think provisioning is relevant. For the key request you'll need to respond with whatever the server response would be.

[mhassanist]

It worked thank yo very much for your support.
Here is the final class is some one needs it.

import com.google.android.exoplayer2.drm.ExoMediaDrm;
import com.google.android.exoplayer2.drm.MediaDrmCallback;
import java.util.UUID;

public class MyDRMCallBack implements MediaDrmCallback {

    String keyString;

    @Override
    public byte[] executeProvisionRequest(UUID uuid, ExoMediaDrm.ProvisionRequest request) throws Exception {
        return new byte[0];
    }

    public MyDRMCallBack(String keyId, String keyValue) {
        this.keyString = "{\"keys\":[{\"kty\":\"oct\",\"k\":\""+keyValue+"\",\"kid\":\""+keyId+"\"}],\"type\":\"temporary\"}";;
    }

    @Override
    public byte[] executeKeyRequest(UUID uuid, ExoMediaDrm.KeyRequest request) throws Exception {
        return keyString.getBytes();
    }
}

[ojw28]

Glad you got it working! You can probably throw UnsupportedOperationException from executeProvisionRequest, since you're basically not supporting it :). The ClearKey CDM should never request provisioning from the callback, as far as I'm aware.

[ojw28]

By the way, how would you feel about making a pull request to contribute this back to the dev-v2 branch, in the drm package, called something like LocalClearKeyMediaDrmCallback? Please feel free to send a pull request if you're able.