@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
    public Map<UUID, byte[]> getPsshInfo() {
        return mApiExtractor.getPsshInfo();
    }
Get the PSSH info if present.
@return a map of uuid-to-bytes, with the uuid specifying
the crypto scheme, and the bytes being the data specific to that scheme.
MediaPlayer/src/main/java/net/protyposis/android/mediaplayer/MediaExtractor.java