Adaptive Multi-Rate Narrowband codec.

Adaptive Multi-Rate Wideband codec.

Not specified.

[`FLAC`](https://xiph.org/flac/documentation.html) (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`.

Uncompressed 16-bit signed little-endian samples (Linear PCM).

8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.

Opus encoded audio frames in Ogg container ([OggOpus](https://wiki.xiph.org/OggOpus)).

Although the use of lossy encodings is not recommended, if a very low bitrate encoding is required, `OGG_OPUS` is highly preferred over Speex encoding.

This event indicates that the server has detected the end of the user's speech utterance and expects no additional speech.

No speech event specified.

Describes the progress of a long-running `LongRunningRecognize` call.

The top-level message sent by the client for the `LongRunningRecognize` method.

The only message returned to the client by the `LongRunningRecognize` method.

Contains audio data in the encoding specified in the `RecognitionConfig`.

Provides information to the recognizer that specifies how to process the request.

The top-level message sent by the client for the `Recognize` method.

The only message returned to the client by the `Recognize` method.

Provides "hints" to the speech recognizer to favor specific words and phrases in the results.

Alternative hypotheses (a.k.a.

A speech recognition result corresponding to a portion of the audio.

Provides information to the recognizer that specifies how to process the request.

A streaming speech recognition result corresponding to a portion of the audio that is currently being processed.

The top-level message sent by the client for the `StreamingRecognize` method.

`StreamingRecognizeResponse` is the only message returned to the client by `StreamingRecognize`.

Word-specific information for recognized words.

Audio encoding of the data sent in the audio message.

Indicates the type of speech event.