src/jarvis_proto/audio.proto
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.. cpp:enum:: enum AudioEncoding

     AudioEncoding specifies the encoding of the audio bytes in the encapsulating message.

  .. cpp:enumerator:: ENCODING_UNSPECIFIED = 0

        Not specified.
  .. cpp:enumerator:: LINEAR_PCM = 1

        Uncompressed 16-bit signed little-endian samples (Linear PCM).
  .. cpp:enumerator:: FLAC = 2

        `FLAC` (Free Lossless Audio Codec) is the recommended encoding because it is lossless--therefore recognition is not compromised--and requires only about half the bandwidth of `LINEAR16`. `FLAC` stream encoding supports 16-bit and 24-bit samples, however, not all fields in `STREAMINFO` are supported.
  .. cpp:enumerator:: MULAW = 3

        8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
  .. cpp:enumerator:: ALAW = 20

        8-bit samples that compand 13-bit audio samples using G.711 PCMU/a-law.