google.cloud.speech.v1.RecognitionConfig.AudioEncoding */ class AudioEncoding { /** * Not specified. * * Generated from protobuf enum ENCODING_UNSPECIFIED = 0; */ const ENCODING_UNSPECIFIED = 0; /** * Uncompressed 16-bit signed little-endian samples (Linear PCM). * * Generated from protobuf enum LINEAR16 = 1; */ const LINEAR16 = 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. * * Generated from protobuf enum FLAC = 2; */ const FLAC = 2; /** * 8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law. * * Generated from protobuf enum MULAW = 3; */ const MULAW = 3; /** * Adaptive Multi-Rate Narrowband codec. `sample_rate_hertz` must be 8000. * * Generated from protobuf enum AMR = 4; */ const AMR = 4; /** * Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000. * * Generated from protobuf enum AMR_WB = 5; */ const AMR_WB = 5; /** * Opus encoded audio frames in Ogg container * ([OggOpus](https://wiki.xiph.org/OggOpus)). * `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000. * * Generated from protobuf enum OGG_OPUS = 6; */ const OGG_OPUS = 6; /** * 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. The [Speex](https://speex.org/) encoding supported by * Cloud Speech API has a header byte in each block, as in MIME type * `audio/x-speex-with-header-byte`. * It is a variant of the RTP Speex encoding defined in * [RFC 5574](https://tools.ietf.org/html/rfc5574). * The stream is a sequence of blocks, one block per RTP packet. Each block * starts with a byte containing the length of the block, in bytes, followed * by one or more frames of Speex data, padded to an integral number of * bytes (octets) as specified in RFC 5574. In other words, each RTP header * is replaced with a single byte containing the block length. Only Speex * wideband is supported. `sample_rate_hertz` must be 16000. * * Generated from protobuf enum SPEEX_WITH_HEADER_BYTE = 7; */ const SPEEX_WITH_HEADER_BYTE = 7; /** * Opus encoded audio frames in WebM container * ([OggOpus](https://wiki.xiph.org/OggOpus)). `sample_rate_hertz` must be * one of 8000, 12000, 16000, 24000, or 48000. * * Generated from protobuf enum WEBM_OPUS = 9; */ const WEBM_OPUS = 9; private static $valueToName = [ self::ENCODING_UNSPECIFIED => 'ENCODING_UNSPECIFIED', self::LINEAR16 => 'LINEAR16', self::FLAC => 'FLAC', self::MULAW => 'MULAW', self::AMR => 'AMR', self::AMR_WB => 'AMR_WB', self::OGG_OPUS => 'OGG_OPUS', self::SPEEX_WITH_HEADER_BYTE => 'SPEEX_WITH_HEADER_BYTE', self::WEBM_OPUS => 'WEBM_OPUS', ]; public static function name($value) { if (!isset(self::$valueToName[$value])) { throw new UnexpectedValueException(sprintf( 'Enum %s has no name defined for value %s', __CLASS__, $value)); } return self::$valueToName[$value]; } public static function value($name) { $const = __CLASS__ . '::' . strtoupper($name); if (!defined($const)) { throw new UnexpectedValueException(sprintf( 'Enum %s has no value defined for name %s', __CLASS__, $name)); } return constant($const); } } // Adding a class alias for backwards compatibility with the previous class name. class_alias(AudioEncoding::class, \Google\Cloud\Speech\V1\RecognitionConfig_AudioEncoding::class);