// SPDX-FileCopyrightText: Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: MIT

syntax = "proto3";

package nvidia.riva;

option cc_enable_arenas = true;
option go_package = "nvidia.com/riva_speech";

/*
 * AudioEncoding specifies the encoding of the audio bytes in the encapsulating message.
 */
enum AudioEncoding {
    // Not specified.
    ENCODING_UNSPECIFIED = 0;

    // Uncompressed 16-bit signed little-endian samples (Linear PCM).
    LINEAR_PCM = 1;

    // `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.
    FLAC = 2;

    // 8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law.
    MULAW = 3;

    OGGOPUS = 4;

    // 8-bit samples that compand 13-bit audio samples using G.711 PCMU/a-law.
    ALAW = 20;
}