< Number of bytes per compressed packet (0 if unknown)
< MUST be "CELT " (four spaces)
< Version used (as string)
< Number of additional headers that follow this header
< Samples per frame (per channel)
< Size of this header
< Number of channels
< Overlapping samples (per channel)
< Sampling rate of the original audio
< Version id (negative for until stream is frozen)
Header data to be used for Ogg files (or possibly other encapsulation) @brief Header data