Enum RecognitionConfig.AudioEncoding (4.7.0)

public enum RecognitionConfig.AudioEncoding extends Enum<RecognitionConfig.AudioEncoding> implements ProtocolMessageEnum

The encoding of the audio data sent in the request. All encodings support only 1 channel (mono) audio, unless the audio_channel_count and enable_separate_recognition_per_channel fields are set. For best results, the audio source should be captured and transmitted using a lossless encoding (FLAC or LINEAR16). The accuracy of the speech recognition can be reduced if lossy codecs are used to capture or transmit audio, particularly if background noise is present. Lossy codecs include MULAW, AMR, AMR_WB, OGG_OPUS, SPEEX_WITH_HEADER_BYTE, MP3, and WEBM_OPUS. The FLAC and WAV audio file formats include a header that describes the included audio content. You can request recognition for WAV files that contain either LINEAR16 or MULAW encoded audio. If you send FLAC or WAV audio file format in your request, you do not need to specify an AudioEncoding; the audio encoding format is determined from the file header. If you specify an AudioEncoding when you send send FLAC or WAV audio, the encoding configuration must match the encoding described in the audio header; otherwise the request returns an google.rpc.Code.INVALID_ARGUMENT error code.

Protobuf enum google.cloud.speech.v1.RecognitionConfig.AudioEncoding

Implements

ProtocolMessageEnum

Inherited Members

Enum.<T>valueOf(Class<T>,String)

Enum.clone()

Enum.compareTo(E)

Enum.equals(Object)

Enum.finalize()

Enum.getDeclaringClass()

Enum.hashCode()

Enum.name()

Enum.ordinal()

Enum.toString()

Object.getClass()

Object.notify()

Object.notifyAll()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Fields

Name	Description
`AMR`	Adaptive Multi-Rate Narrowband codec. `sample_rate_hertz` must be 8000. `AMR = 4;`
`AMR_VALUE`	Adaptive Multi-Rate Narrowband codec. `sample_rate_hertz` must be 8000. `AMR = 4;`
`AMR_WB`	Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000. `AMR_WB = 5;`
`AMR_WB_VALUE`	Adaptive Multi-Rate Wideband codec. `sample_rate_hertz` must be 16000. `AMR_WB = 5;`
`ENCODING_UNSPECIFIED`	Not specified. `ENCODING_UNSPECIFIED = 0;`
`ENCODING_UNSPECIFIED_VALUE`	Not specified. `ENCODING_UNSPECIFIED = 0;`
`FLAC`	`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;`
`FLAC_VALUE`	`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;`
`LINEAR16`	Uncompressed 16-bit signed little-endian samples (Linear PCM). `LINEAR16 = 1;`
`LINEAR16_VALUE`	Uncompressed 16-bit signed little-endian samples (Linear PCM). `LINEAR16 = 1;`
`MULAW`	8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law. `MULAW = 3;`
`MULAW_VALUE`	8-bit samples that compand 14-bit audio samples using G.711 PCMU/mu-law. `MULAW = 3;`
`OGG_OPUS`	Opus encoded audio frames in Ogg container (OggOpus). `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000. `OGG_OPUS = 6;`
`OGG_OPUS_VALUE`	Opus encoded audio frames in Ogg container (OggOpus). `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000. `OGG_OPUS = 6;`
`SPEEX_WITH_HEADER_BYTE`	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 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. 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. `SPEEX_WITH_HEADER_BYTE = 7;`
`SPEEX_WITH_HEADER_BYTE_VALUE`	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 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. 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. `SPEEX_WITH_HEADER_BYTE = 7;`
`UNRECOGNIZED`
`WEBM_OPUS`	Opus encoded audio frames in WebM container (OggOpus). `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000. `WEBM_OPUS = 9;`
`WEBM_OPUS_VALUE`	Opus encoded audio frames in WebM container (OggOpus). `sample_rate_hertz` must be one of 8000, 12000, 16000, 24000, or 48000. `WEBM_OPUS = 9;`

Static Methods

Name	Description
`forNumber(int value)`
`getDescriptor()`
`internalGetValueMap()`
`valueOf(Descriptors.EnumValueDescriptor desc)`
`valueOf(int value)`	Deprecated. Use #forNumber(int) instead.
`valueOf(String name)`
`values()`

Methods

Name	Description
`getDescriptorForType()`
`getNumber()`
`getValueDescriptor()`