aac

README

AAC-LD and AAC-ELD

Codec	Rate	QuickTime	ffmpeg	VLC
AAC-LD	8000	yes	no	no
AAC-LD	16000	yes	no	no
AAC-LD	22050	yes	yes	no
AAC-LD	24000	yes	yes	no
AAC-LD	32000	yes	yes	no
AAC-ELD	8000	yes	no	no
AAC-ELD	16000	yes	no	no
AAC-ELD	22050	yes	yes	yes
AAC-ELD	24000	yes	yes	yes
AAC-ELD	32000	yes	yes	yes

Useful links

• 4.6.20 Enhanced Low Delay Codec
• https://stackoverflow.com/questions/40014508/aac-adts-for-aacobject-eld-packets
• https://code.videolan.org/videolan/vlc/-/blob/master/modules/packetizer/mpeg4audio.c

Documentation

Index

• Constants
• func ADTSTimeSize(b []byte) uint32
• func ADTSToCodec(b []byte) *core.Codec
• func ADTStoRTP(src []byte) (dst []byte)
• func CodecToADTS(codec *core.Codec) []byte
• func ConfigToCodec(conf []byte) *core.Codec
• func DecodeConfig(b []byte) (objType, sampleFreqIdx, channels byte, sampleRate uint32)
• func EncodeConfig(objType byte, sampleRate uint32, channels byte, shortFrame bool) []byte
• func EncodeToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc
• func IsADTS(b []byte) bool
• func RTPDepay(handler core.HandlerFunc) core.HandlerFunc
• func RTPPay(handler core.HandlerFunc) core.HandlerFunc
• func RTPTimeSize(b []byte) uint32
• func RTPToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc
• func RTPToCodec(b []byte) *core.Codec
• func ReadADTSSize(b []byte) uint16
• func WriteADTSSize(b []byte, size uint16)
• type Consumer
  • func NewConsumer() *Consumer
  • func (c *Consumer) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error
  • func (c *Consumer) WriteTo(wr io.Writer) (int64, error)
• type Producer
  • func Open(r io.Reader) (*Producer, error)
  • func (c *Producer) Start() error

Constants

const (
	TypeAACMain = 1
	TypeAACLC   = 2  // Low Complexity
	TypeAACLD   = 23 // Low Delay (48000, 44100, 32000, 24000, 22050)
	TypeESCAPE  = 31
	TypeAACELD  = 39 // Enhanced Low Delay

	AUTime = 1024

	// FMTP streamtype=5 - audio stream
	FMTP = "streamtype=5;profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config="
)

const ADTSHeaderSize = 7

const RTPPacketVersionAAC = 0

Functions

func ADTSTimeSize

func ADTSTimeSize(b []byte) uint32

func ADTSToCodec

func ADTSToCodec(b []byte) *core.Codec

func ADTStoRTP

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

func CodecToADTS

func CodecToADTS(codec *core.Codec) []byte

func ConfigToCodec

func ConfigToCodec(conf []byte) *core.Codec

func DecodeConfig

func DecodeConfig(b []byte) (objType, sampleFreqIdx, channels byte, sampleRate uint32)

func EncodeConfig

func EncodeConfig(objType byte, sampleRate uint32, channels byte, shortFrame bool) []byte

func EncodeToADTS

func EncodeToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc

func IsADTS

func IsADTS(b []byte) bool

func RTPDepay

func RTPDepay(handler core.HandlerFunc) core.HandlerFunc

func RTPPay

func RTPPay(handler core.HandlerFunc) core.HandlerFunc

func RTPTimeSize

func RTPTimeSize(b []byte) uint32

func RTPToADTS

func RTPToADTS(codec *core.Codec, handler core.HandlerFunc) core.HandlerFunc

func RTPToCodec

func RTPToCodec(b []byte) *core.Codec

func ReadADTSSize

func ReadADTSSize(b []byte) uint16

func WriteADTSSize

func WriteADTSSize(b []byte, size uint16)

Types

type Consumer

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

func NewConsumer

func NewConsumer() *Consumer

func (*Consumer) AddTrack

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

func (*Consumer) WriteTo

func (c *Consumer) WriteTo(wr io.Writer) (int64, error)

type Producer

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

func Open

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

func (*Producer) Start

func (c *Producer) Start() error