README
¶
g711
import "github.com/zaf/g711"
Package g711 implements encoding and decoding of G711 PCM sound data. G.711 is an ITU-T standard for audio companding.
For usage details please see the code snippets in the cmd folder.
Usage
const (
// Input and output formats
Alaw = iota // Alaw G711 encoded PCM data
Ulaw // Ulaw G711 encoded PCM data
Lpcm // Lpcm 16bit signed linear data
)
func Alaw2Ulaw
func Alaw2Ulaw(alaw []byte) []byte
Alaw2Ulaw performs direct A-law to u-law data conversion
func Alaw2UlawFrame
func Alaw2UlawFrame(frame uint8) uint8
Alaw2UlawFrame directly converts an A-law frame to u-law
func DecodeAlaw
func DecodeAlaw(pcm []byte) []byte
DecodeAlaw decodes A-law PCM data to 16bit LPCM
func DecodeAlawFrame
func DecodeAlawFrame(frame uint8) int16
DecodeAlawFrame decodes an A-law PCM frame to 16bit LPCM
func DecodeUlaw
func DecodeUlaw(pcm []byte) []byte
DecodeUlaw decodes u-law PCM data to 16bit LPCM
func DecodeUlawFrame
func DecodeUlawFrame(frame uint8) int16
DecodeUlawFrame decodes a u-law PCM frame to 16bit LPCM
func EncodeAlaw
func EncodeAlaw(lpcm []byte) []byte
EncodeAlaw encodes 16bit LPCM data to G711 A-law PCM
func EncodeAlawFrame
func EncodeAlawFrame(frame int16) uint8
EncodeAlawFrame encodes a 16bit LPCM frame to G711 A-law PCM
func EncodeUlaw
func EncodeUlaw(lpcm []byte) []byte
EncodeUlaw encodes 16bit LPCM data to G711 u-law PCM
func EncodeUlawFrame
func EncodeUlawFrame(frame int16) uint8
EncodeUlawFrame encodes a 16bit LPCM frame to G711 u-law PCM
func Ulaw2Alaw
func Ulaw2Alaw(ulaw []byte) []byte
Ulaw2Alaw performs direct u-law to A-law data conversion
func Ulaw2AlawFrame
func Ulaw2AlawFrame(frame uint8) uint8
Ulaw2AlawFrame directly converts a u-law frame to A-law
type Decoder
type Decoder struct {
}
Decoder reads G711 PCM data and decodes it to 16bit 8000Hz LPCM
func NewAlawDecoder
func NewAlawDecoder(reader io.Reader) (*Decoder, error)
NewAlawDecoder returns a pointer to a Decoder that implements an io.Reader. It takes as input the source data Reader.
func NewUlawDecoder
func NewUlawDecoder(reader io.Reader) (*Decoder, error)
NewUlawDecoder returns a pointer to a Decoder that implements an io.Reader. It takes as input the source data Reader.
func (*Decoder) Read
func (r *Decoder) Read(p []byte) (i int, err error)
Read decodes G711 data. Reads up to len(p) bytes into p, returns the number of bytes read and any error encountered.
func (*Decoder) Reset
func (r *Decoder) Reset(reader io.Reader) error
Reset discards the Decoder state. This permits reusing a Decoder rather than allocating a new one.
type Encoder
type Encoder struct {
}
Encoder encodes 16bit 8000Hz LPCM data to G711 PCM or directly transcodes between A-law and u-law
func NewAlawEncoder
func NewAlawEncoder(writer io.Writer, input int) (*Encoder, error)
NewAlawEncoder returns a pointer to an Encoder that implements an io.Writer. It takes as input the destination data Writer and the input encoding format.
func NewUlawEncoder
func NewUlawEncoder(writer io.Writer, input int) (*Encoder, error)
NewUlawEncoder returns a pointer to an Encoder that implements an io.Writer. It takes as input the destination data Writer and the input encoding format.
func (*Encoder) Reset
func (w *Encoder) Reset(writer io.Writer) error
Reset discards the Encoder state. This permits reusing an Encoder rather than allocating a new one.
func (*Encoder) Write
func (w *Encoder) Write(p []byte) (i int, err error)
Write encodes G711 Data. Writes len(p) bytes from p to the underlying data stream, returns the number of bytes written from p (0 <= n <= len(p)) and any error encountered that caused the write to stop early.
Documentation
¶
Overview ¶
Package g711 implements encoding and decoding of G711 PCM sound data. G.711 is an ITU-T standard for audio companding.
For usage details please see the code snippets in the cmd folder.
Index ¶
- Constants
- func Alaw2Ulaw(alaw []byte) []byte
- func Alaw2UlawFrame(frame uint8) uint8
- func DecodeAlaw(pcm []byte) []byte
- func DecodeAlawFrame(frame uint8) int16
- func DecodeUlaw(pcm []byte) []byte
- func DecodeUlawFrame(frame uint8) int16
- func EncodeAlaw(lpcm []byte) []byte
- func EncodeAlawFrame(frame int16) uint8
- func EncodeUlaw(lpcm []byte) []byte
- func EncodeUlawFrame(frame int16) uint8
- func Ulaw2Alaw(ulaw []byte) []byte
- func Ulaw2AlawFrame(frame uint8) uint8
- type Decoder
- type Encoder
Constants ¶
const ( // Input and output formats Alaw = iota // Alaw G711 encoded PCM data Ulaw // Ulaw G711 encoded PCM data Lpcm // Lpcm 16bit signed linear data )
Variables ¶
This section is empty.
Functions ¶
func Alaw2UlawFrame ¶
Alaw2UlawFrame directly converts an A-law frame to u-law
func DecodeAlaw ¶
DecodeAlaw decodes A-law PCM data to 16bit LPCM
func DecodeAlawFrame ¶
DecodeAlawFrame decodes an A-law PCM frame to 16bit LPCM
func DecodeUlaw ¶
DecodeUlaw decodes u-law PCM data to 16bit LPCM
func DecodeUlawFrame ¶
DecodeUlawFrame decodes a u-law PCM frame to 16bit LPCM
func EncodeAlaw ¶
EncodeAlaw encodes 16bit LPCM data to G711 A-law PCM
func EncodeAlawFrame ¶
EncodeAlawFrame encodes a 16bit LPCM frame to G711 A-law PCM
func EncodeUlaw ¶
EncodeUlaw encodes 16bit LPCM data to G711 u-law PCM
func EncodeUlawFrame ¶
EncodeUlawFrame encodes a 16bit LPCM frame to G711 u-law PCM
func Ulaw2AlawFrame ¶
Ulaw2AlawFrame directly converts a u-law frame to A-law
Types ¶
type Decoder ¶
type Decoder struct {
// contains filtered or unexported fields
}
Decoder reads G711 PCM data and decodes it to 16bit 8000Hz LPCM
func NewAlawDecoder ¶
NewAlawDecoder returns a pointer to a Decoder that implements an io.Reader. It takes as input the source data Reader.
func NewUlawDecoder ¶
NewUlawDecoder returns a pointer to a Decoder that implements an io.Reader. It takes as input the source data Reader.
type Encoder ¶
type Encoder struct {
// contains filtered or unexported fields
}
Encoder encodes 16bit 8000Hz LPCM data to G711 PCM or directly transcodes between A-law and u-law
func NewAlawEncoder ¶
NewAlawEncoder returns a pointer to an Encoder that implements an io.Writer. It takes as input the destination data Writer and the input encoding format.
func NewUlawEncoder ¶
NewUlawEncoder returns a pointer to an Encoder that implements an io.Writer. It takes as input the destination data Writer and the input encoding format.
Source Files
Directories