Question

我需要离线播放受DRM保护的内容。我将两个文件存储在本地存储中;一个短划线文件，指向同一目录中的mp4文件。

文件的密钥也存储在数据库中，并在启动播放时检索。

但是，在构建DRM会话后，将引发以下错误：

playerFailed [1.04]
com.google.android.exoplayer2.ExoPlaybackException
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.feedInputBuffer(MediaCodecRenderer.java:691)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:507)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:466)
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:300)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:148)
    at android.os.HandlerThread.run(HandlerThread.java:61)
    at com.google.android.exoplayer2.util.PriorityHandlerThread.run(PriorityHandlerThread.java:40)
 Caused by: android.media.MediaCodec$CryptoException: Error decrypting data: requested key has not been loaded
    at android.media.MediaCodec.native_queueSecureInputBuffer(Native Method)
    at android.media.MediaCodec.queueSecureInputBuffer(MediaCodec.java:2292)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.feedInputBuffer(MediaCodecRenderer.java:682)
    at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:507) 
    at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:466) 
    at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:300) 
    at android.os.Handler.dispatchMessage(Handler.java:98) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.os.HandlerThread.run(HandlerThread.java:61) 
    at com.google.android.exoplayer2.util.PriorityHandlerThread.run(PriorityHandlerThread.java:40)

我使用此块来检查给定轨道是否有钥匙，然后再申请新钥匙。

private DrmSessionManager<FrameworkMediaCrypto> buildDrmSessionManager(UUID uuid, String licenseURL,
                                                                           Map<String, String> keyRequestProperties) throws UnsupportedDrmException {
        HttpMediaDrmCallback drmCallback = new HttpMediaDrmCallback(licenseURL, buildHttpDataSourceFactory(false), keyRequestProperties);

        defaultDrmSessionManager = new DefaultDrmSessionManager<>(uuid, FrameworkMediaDrm.newInstance(uuid), drmCallback, null, mainHandler, eventLogger);

        if (track != null) {
            DrmKey key = realm.where(DrmKey.class).equalTo("trackId", track.getId()).findFirst();

            Log.e("TrackId", track.getId());

            if (key != null) {
                byte[] offlineKeySetId = Base64.decode(key.getRequestKey(), Base64.DEFAULT);
                defaultDrmSessionManager.setMode(DefaultDrmSessionManager.MODE_QUERY, offlineKeySetId);
                Log.e("Key", key.getRequestKey());

                Log.e(MusicService.class.getSimpleName(), "OfflineKeySet already defined, using the existing one : " + key.getRequestKey());
            } else {
                defaultDrmSessionManager.setMode(DefaultDrmSessionManager.MODE_DOWNLOAD, null);
                Log.e(MusicService.class.getSimpleName(), "Offline key not defined, retrieving a new licence");
            }
        }

        return defaultDrmSessionManager;
    }

对于我尝试播放的所有离线文件，密钥始终可用。那么为什么exoplayer无法播放任何文件？

Answer 1

我认为我的密钥不匹配，因此错误。使用正确的密钥提供时播放的文件。

脱机播放受DRM保护的内容

1 个答案: