pcm

package

v1.9.11 Latest Latest Go to latest Published: Oct 21, 2025 License: MIT Imports: 12 Imported by: 1

Details

Valid go.mod file
Redistributable license
Tagged version
Stable version
Learn more about best practices

Repository

github.com/AlexxIT/go2rtc

Links

Documentation ¶

Overview ¶

Package pcm - support raw (verbatim) PCM 16 bit in the FLAC container: - only 1 channel - only 16 bit per sample - only 8000, 16000, 24000, 48000 sample rate

Package pcm https://www.codeproject.com/Articles/14237/Using-the-G711-standard

Index ¶

func BytesPerDuration(codec *core.Codec, duration time.Duration) int
func BytesPerFrame(codec *core.Codec) int
func BytesPerSample(codec *core.Codec) int
func ConsumerCodecs() []*core.Codec
func Downsample(k float32) func([]int16) []int16
func FLACEncoder(codecName string, clockRate uint32, handler core.HandlerFunc) core.HandlerFunc
func FLACHeader(magic bool, sampleRate uint32) []byte
func FlipEndian(src []byte) (dst []byte)
func FramesPerDuration(codec *core.Codec, duration time.Duration) int
func LittleToBig(handler core.HandlerFunc) core.HandlerFunc
func NewBackchannel(cmd *shell.Command, audio string) (core.Producer, error)
func PCMAtoPCM(alaw byte) int16
func PCMUtoPCM(ulaw byte) int16
func PCMtoPCMA(pcm int16) byte
func PCMtoPCMU(pcm int16) byte
func ProducerCodecs() []*core.Codec
func RepackG711(zeroTS bool, handler core.HandlerFunc) core.HandlerFunc
func Transcode(dst, src *core.Codec) func([]byte) []byte
func TranscodeHandler(dst, src *core.Codec, handler core.HandlerFunc) core.HandlerFunc
func Upsample(k float32) func([]int16) []int16
type Backchannel
- func (c *Backchannel) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error
- func (c *Backchannel) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error)
- func (c *Backchannel) Start() error
type Producer
- func Open(rd io.Reader) (*Producer, error)
- func (c *Producer) Start() error
type ProducerSync
- func OpenSync(codec *core.Codec, rd io.Reader) *ProducerSync
- func (p *ProducerSync) OnClose(f func())
- func (p *ProducerSync) Start() error

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func BytesPerDuration ¶ added in v1.9.10

func BytesPerDuration(codec *core.Codec, duration time.Duration) int

func BytesPerFrame ¶ added in v1.9.10

func BytesPerFrame(codec *core.Codec) int

func BytesPerSample ¶ added in v1.9.10

func BytesPerSample(codec *core.Codec) int

func ConsumerCodecs ¶ added in v1.9.10

func ConsumerCodecs() []*core.Codec

func Downsample ¶ added in v1.9.10

func Downsample(k float32) func([]int16) []int16

func FLACEncoder ¶

func FLACEncoder(codecName string, clockRate uint32, handler core.HandlerFunc) core.HandlerFunc

func FLACHeader ¶

func FLACHeader(magic bool, sampleRate uint32) []byte

func FlipEndian ¶ added in v1.9.10

func FlipEndian(src []byte) (dst []byte)

func FramesPerDuration ¶ added in v1.9.10

func FramesPerDuration(codec *core.Codec, duration time.Duration) int

func LittleToBig ¶ added in v1.6.1

func LittleToBig(handler core.HandlerFunc) core.HandlerFunc

LittleToBig - convert PCM little endian to PCM big endian

func NewBackchannel ¶ added in v1.9.10

func NewBackchannel(cmd *shell.Command, audio string) (core.Producer, error)

func PCMAtoPCM ¶

func PCMAtoPCM(alaw byte) int16

func PCMUtoPCM ¶

func PCMUtoPCM(ulaw byte) int16

func PCMtoPCMA ¶

func PCMtoPCMA(pcm int16) byte

func PCMtoPCMU ¶

func PCMtoPCMU(pcm int16) byte

func ProducerCodecs ¶ added in v1.9.10

func ProducerCodecs() []*core.Codec

func RepackG711 ¶ added in v1.6.0

func RepackG711(zeroTS bool, handler core.HandlerFunc) core.HandlerFunc

RepackG711 - Repack G.711 PCMA/PCMU into frames of size 1024

Fixes WebRTC audio quality issue (monotonic timestamp)
Fixes Reolink Doorbell backchannel issue (zero timestamp) https://github.com/AlexxIT/go2rtc/issues/331

func Transcode ¶ added in v1.9.10

func Transcode(dst, src *core.Codec) func([]byte) []byte

func TranscodeHandler ¶ added in v1.9.10

func TranscodeHandler(dst, src *core.Codec, handler core.HandlerFunc) core.HandlerFunc

func Upsample ¶ added in v1.9.10

func Upsample(k float32) func([]int16) []int16

Types ¶

type Backchannel ¶ added in v1.9.10

type Backchannel struct {
	core.Connection
	// contains filtered or unexported fields
}

func (*Backchannel) AddTrack ¶ added in v1.9.10

func (c *Backchannel) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error

func (*Backchannel) GetTrack ¶ added in v1.9.10

func (c *Backchannel) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error)

func (*Backchannel) Start ¶ added in v1.9.10

func (c *Backchannel) Start() error

type Producer ¶ added in v1.9.8

type Producer struct {
	core.Connection
	// contains filtered or unexported fields
}

func Open ¶ added in v1.9.8

func Open(rd io.Reader) (*Producer, error)

func (*Producer) Start ¶ added in v1.9.8

func (c *Producer) Start() error

type ProducerSync ¶ added in v1.9.10

type ProducerSync struct {
	core.Connection
	// contains filtered or unexported fields
}

func OpenSync ¶ added in v1.9.10

func OpenSync(codec *core.Codec, rd io.Reader) *ProducerSync

func (*ProducerSync) OnClose ¶ added in v1.9.10

func (p *ProducerSync) OnClose(f func())

func (*ProducerSync) Start ¶ added in v1.9.10

func (p *ProducerSync) Start() error

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
s16le
v1 Package v1 http://web.archive.org/web/20110719132013/http://hazelware.luggle.com/tutorials/mulawcompression.html	Package v1 http://web.archive.org/web/20110719132013/http://hazelware.luggle.com/tutorials/mulawcompression.html

?	: This menu
/	: Search site
f or F	: Jump to
y or Y	: Canonical URL