Playback error on using ClearKey DRM Schema in Exoplayer 2 android

问题

I am trying to play the .MPD file, which is using

DRMSchema : clearKey

For playing it i am creating a DefaultDrmSessionManager in the following way

 String keyString = "{\"keys\":[{\"kty\":\"oct\",\"k\":\"y1QQhMmXMa70__dFAMEurQ\n" +
                "    \",\"kid\":\"bXbyXLF_Xha46u9rv1gtjg\n" +
                "    \"},{\"kty\":\"oct\",\"k\":\"pGMaFTpEPfnu0FkwQ9t1GQ\n" +
                "    \",\"kid\":\"88XgNh5mVLKPgEnHeLI5Rg\n" +
                "    \"}],'type':\"temporary\"}";

LogMgr.i("DRMCallback JSON : " + keyString);

drmCallback = new LocalMediaDrmCallback(keyString.getBytes());

mediaDrm = FrameworkMediaDrm.newInstance(uuid);

DefaultDrmSessionManager<FrameworkMediaCrypto> drmSessionManager = new DefaultDrmSessionManager<>(uuid, mediaDrm, drmCallback, null, multiSession);

After that, when i am trying to use this DefaultDrmSessionManager for playing the video, i am getting ExoPlayerImplInternal: Playback error, i am attaching the Log for reference.

E/ExoPlayerImplInternal: **Playback error**.
com.google.android.exoplayer2.ExoPlaybackException
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.feedInputBuffer(MediaCodecRenderer.java:780)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:583)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:518)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:301)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:164)
    at android.os.HandlerThread.run(HandlerThread.java:65)
 Caused by: android.media.MediaCodec$CryptoException: **Crypto key not available**
    at android.media.MediaCodec.native_queueSecureInputBuffer(Native Method)
    at android.media.MediaCodec.queueSecureInputBuffer(MediaCodec.java:2547)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.feedInputBuffer(MediaCodecRenderer.java:771)

Please guide me, what i am doing wrong

回答1:

Looking at the length of the key string, the most likely problem is that the key has not been base64URL encoded in the call to LocalMediaDrmCallback.

An AES 128-bit key will be:

32 characters as a hex key
24 characters when base64 encoded

Assuming that a4631a153a443df9eed0593043db7519 is the key in hex format then you need to convert it (and the keyID also) to base64 and then pass them this way to LocalMediaDrmCallback.

Using one of the common online convertors you can see this would give:

hex key: a4631a153a443df9eed0593043db7519
base64 encoded pGMaFTpEPfnu0FkwQ9t1GQ==

You can see an example of doing this programmatically also in this GitHub issue answer: https://github.com/google/ExoPlayer/issues/3856#issuecomment-366197586

回答2:

It is working fine after removing \n from the keyString.. :)

来源：https://stackoverflow.com/questions/53426119/playback-error-on-using-clearkey-drm-schema-in-exoplayer-2-android

标签

android

exoplayer

drm

mpeg-dash

exoplayer2.x