Add AES-ECB as a supported encryption mode in ECMG

protos/public/media_cas.proto

@@ -71,6 +71,7 @@ message EcmMetaData {
     DVB_CSA3 = 4;
     AES_OFB = 5;
     AES_SCTE52 = 6;
+    AES_ECB = 7;
   }
   // Required. The cipher mode used to encrypt/decrypt the content.
   optional CipherMode cipher_mode = 1;

protos/public/media_cas_encryption.proto

@@ -61,6 +61,7 @@ message CasEncryptionResponse {
     // Optional label used for the key.
     optional string track_type = 3;
     optional KeySlot key_slot = 4;
+    optional uint32 period_index = 5;
   }
   optional Status status = 1;
   optional string status_message = 2;