[ClearKey] DASH playback supports CBCS?

[isaacchiang-kkstream]

Hi,

We are using media3 (1.4.1) to play ClearKey’s CMAF videos. Since we want to be compatible with iOS AVPlayer (ClearKey + cbcs supported only), the CMAF test videos all use ClearKey + cbcs, but on media3 we find that an error occurs

Failed on decrypt, error description:Status(-8, EX_SERVICE_SPECIFIC): '4: {"cdmError":4,"errorMessage":"selected encryption mode is not supported by the ClearKey DRM Plugin"}

, and cannot be played normally. The official description only supports ClearKey + cenc.

I would like to ask if media3 will support CBCS in the future?

Test steps:

1. Use the "demo" project of media3 version 1.4.1
2. Add below two test contents in json file

     {
        "name": "video-dev CBCS",
        "uri": "https://refapp.hbbtv.org/videos/00_llama_h264_v9/cbcs/manifest_ckcenc_1080p.mpd",
        "drm_scheme": "clearkey",
        "drm_license_uri": "https://refapp.hbbtv.org/videos/laurl_ck.php?kid=1236"
      },
      {
        "name": "video-dev CENC",
        "uri": "https://refapp.hbbtv.org/videos/00_llama_h264_v9/cenc/manifest_ckcenc_1080p.mpd",
        "drm_scheme": "clearkey",
        "drm_license_uri": "https://refapp.hbbtv.org/videos/laurl_ck.php?kid=1236"
      }

3. Run the demo app and check the playback. CENC worked, but CBCS failed.

Test device

Pixel 9 Pro, Android OS 15

[tonihei]

This is a limitation of the underlying DRM system in the Android platform. Please see the discussion here: google/ExoPlayer#7945. ExoPlayer can't add support as long as the platform doesn't support it.