Do you know the browser's CDM support IV size for Widevine DRM decoding?

[Liang]

I'm use Chrome 47 with player http://shaka-player-demo.appspot.com/ to do testing.
My content is encrypted with CENC which support 8 and 16 bytes IV in spec. We used default 8 bytes IV size and It is work well in Windows Server IE 11 for Playready DRM with same kid, key.
But for Chrome it throw out MEDIA_ERROR_DECODE error message.
Both encrypted fragment seems totally same after verified by MD5. I can find only difference is pssh data between this two DRM.
Do you know the browser's CDM support IV size? or where i can find this define.

Thanks!

[Tima Vaisburd]

The android documentation says 16-byte initialization vector and 16-byte opaque key

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[Liang]

Thanks for your reply. Do you know Chrome support IV size?

[Tima Vaisburd]

I know that on Android it passed IV to MediaCodec.queueSecureInputBuffer(), but I do not know how does it work on other platforms.

[Stephen James]

The following is from the decrypt_config.h file in media. It seems to say only 16 bytes.

This is used by the internal clearKey / AES decryptor, not sure about plugin decryptors.

  // Keys are always 128 bits.
  static const int kDecryptionKeySize = 16;

  // |key_id| is the ID that references the decryption key for this sample.
  // |iv| is the initialization vector defined by the encrypted format.
  //   Currently |iv| must be 16 bytes as defined by WebM and ISO. Or must be
  //   empty which signals an unencrypted frame.
  // |subsamples| defines the clear and encrypted portions of the sample as
  //   described above. A decrypted buffer will be equal in size to the sum
  //   of the subsample sizes.

[Liang]

Yes , I have found this description. Where we can look for the define for plugin decryptors? hope who have this experience can me a help?

Anyway, thanks all firstly.