Commits on Jan 19, 2022

1. Fix handling encrypted AAC frames when there's no encrypted data in a… …

   … frame
   
   The `decryptAacSample()` was failing when the content size of the frame was
   less than 16 bytes (which is the size of unencrypted portion). Specifically,
   `curUnit.set(decryptedData, 16);` code was failing because `curUnit`
   was smaller than 16, so there was attempt to write outside of the buffer.
   
   According to the documentation [1], each AAC frame consists of
   * ADTS Header (7-9 bytes)
   * unencrypted leader (16 bytes)
   * a sequence of 16 bytes encrypted blocks (n x 16 bytes)
   * unencrypted trailer (0-15 bytes)
   
   In the failing case, the frame contained ADTS header (7 bytes), but the
   unencrypted leader was only 13 bytes long.
   
   [1] Section `2.3.1.1 AAC` https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption/Encryption/Encryption.html

   

   loganek committed Jan 19, 2022
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