stream

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 Go to latest Published: Apr 2, 2024 License: MIT Imports: 14 Imported by: 6

Documentation

Overview

Mostly take from github.com/Workiva/go-datastructures.

Index

Constants

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const DefaultHLSStreamCap = uint(500)
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const DefaultHLSStreamWin = uint(3)
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const DefaultSegWaitTime = time.Second * 10

const DefaultMediaWinLen = uint(5)

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const SegWaitInterval = time.Second

Variables

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var (
	// ErrDisposed is returned when an operation is performed on a disposed
	// queue.
	ErrDisposed = errors.New(`queue: disposed`)

	// ErrTimeout is returned when an applicable queue operation times out.
	ErrTimeout = errors.New(`queue: poll timed out`)

	// ErrEmptyQueue is returned when an non-applicable queue operation was called
	// due to the queue's empty item state
	ErrEmptyQueue = errors.New(`queue: empty queue`)
)
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var (
	HLS  = MakeVideoFormatType(avFormatTypeMagic + 1)
	RTMP = MakeVideoFormatType(avFormatTypeMagic + 2)
	DASH = MakeVideoFormatType(avFormatTypeMagic + 3)
)
View Source 
var ErrAddHLSSegment = errors.New("ErrAddHLSSegment")
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var ErrBadHLSBuffer = errors.New("BadHLSBuffer")
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var ErrBufferEmpty = errors.New("Stream Buffer Empty")
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var ErrBufferFull = errors.New("Stream Buffer Full")
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var ErrBufferItemType = errors.New("Buffer Item Type Not Recognized")
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var ErrDroppedRTMPStream = errors.New("RTMP Stream Stopped Without EOF")
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var ErrEOF = errors.New("ErrEOF")
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var ErrHttpReqFailed = errors.New("Http Request Failed")
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var ErrNotFound = errors.New("Not Found")
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var ErrVideoManifest = errors.New("ErrVideoManifest")

Functions

func ExecuteInParallel 

func ExecuteInParallel(q *Queue, fn func(interface{}))

ExecuteInParallel will (in parallel) call the provided function with each item in the queue until the queue is exhausted. When the queue is exhausted execution is complete and all goroutines will be killed. This means that the queue will be disposed so cannot be used again.

Types

type AppData 

type AppData interface {
	StreamID() string
}

type BasicHLSVideoManifest 

type BasicHLSVideoManifest struct {
	// contains filtered or unexported fields
}

func NewBasicHLSVideoManifest 

func NewBasicHLSVideoManifest(id string) *BasicHLSVideoManifest

func (*BasicHLSVideoManifest) AddVideoStream 

func (m *BasicHLSVideoManifest) AddVideoStream(strm HLSVideoStream, variant *m3u8.Variant) error

func (*BasicHLSVideoManifest) DeleteVideoStream 

func (m *BasicHLSVideoManifest) DeleteVideoStream(strmID string) error

func (*BasicHLSVideoManifest) GetManifest 

func (m *BasicHLSVideoManifest) GetManifest() (*m3u8.MasterPlaylist, error)

func (*BasicHLSVideoManifest) GetManifestID 

func (m *BasicHLSVideoManifest) GetManifestID() string

func (*BasicHLSVideoManifest) GetStreamVariant 

func (m *BasicHLSVideoManifest) GetStreamVariant(strmID string) (*m3u8.Variant, error)

func (*BasicHLSVideoManifest) GetVideoFormat 

func (m *BasicHLSVideoManifest) GetVideoFormat() VideoFormat

func (*BasicHLSVideoManifest) GetVideoStream 

func (m *BasicHLSVideoManifest) GetVideoStream(strmID string) (HLSVideoStream, error)

func (*BasicHLSVideoManifest) GetVideoStreams 

func (m *BasicHLSVideoManifest) GetVideoStreams() []HLSVideoStream

func (BasicHLSVideoManifest) String 

func (m BasicHLSVideoManifest) String() string

type BasicHLSVideoStream 

type BasicHLSVideoStream struct {
	// contains filtered or unexported fields
}

BasicHLSVideoStream is a basic implementation of HLSVideoStream

func NewBasicHLSVideoStream 

func NewBasicHLSVideoStream(strmID string, wSize uint) *BasicHLSVideoStream

func (*BasicHLSVideoStream) AddHLSSegment 

func (s *BasicHLSVideoStream) AddHLSSegment(seg *HLSSegment) error

AddHLSSegment adds the hls segment to the right stream

func (*BasicHLSVideoStream) AppData 

func (s *BasicHLSVideoStream) AppData() AppData

func (*BasicHLSVideoStream) End 

func (s *BasicHLSVideoStream) End()

func (*BasicHLSVideoStream) GetHLSSegment 

func (s *BasicHLSVideoStream) GetHLSSegment(segName string) (*HLSSegment, error)

GetHLSSegment gets the HLS segment. It blocks until something is found, or timeout happens.

func (*BasicHLSVideoStream) GetStreamFormat 

func (s *BasicHLSVideoStream) GetStreamFormat() VideoFormat

GetStreamFormat always returns HLS

func (*BasicHLSVideoStream) GetStreamID 

func (s *BasicHLSVideoStream) GetStreamID() string

GetStreamID returns the streamID

func (*BasicHLSVideoStream) GetStreamPlaylist 

func (s *BasicHLSVideoStream) GetStreamPlaylist() (*m3u8.MediaPlaylist, error)

GetStreamPlaylist returns the media playlist represented by the streamID

func (*BasicHLSVideoStream) SetSubscriber 

func (s *BasicHLSVideoStream) SetSubscriber(f func(seg *HLSSegment, eof bool))

SetSubscriber sets the callback function that will be called when a new hls segment is inserted

func (BasicHLSVideoStream) String 

func (s BasicHLSVideoStream) String() string

type BasicRTMPVideoStream 

type BasicRTMPVideoStream struct {
	EOF chan struct{}

	RTMPTimeout time.Duration
	// contains filtered or unexported fields
}

func NewBasicRTMPVideoStream 

func NewBasicRTMPVideoStream(data AppData) *BasicRTMPVideoStream

NewBasicRTMPVideoStream creates a new BasicRTMPVideoStream. The default RTMPTimeout is set to 10 milliseconds because we assume all RTMP streams are local.

func (*BasicRTMPVideoStream) AppData 

func (s *BasicRTMPVideoStream) AppData() AppData

func (*BasicRTMPVideoStream) Close 

func (s *BasicRTMPVideoStream) Close()

func (*BasicRTMPVideoStream) GetStreamFormat 

func (s *BasicRTMPVideoStream) GetStreamFormat() VideoFormat

func (*BasicRTMPVideoStream) GetStreamID 

func (s *BasicRTMPVideoStream) GetStreamID() string

func (BasicRTMPVideoStream) Height 

func (s BasicRTMPVideoStream) Height() int

func (*BasicRTMPVideoStream) ReadRTMPFromStream 

func (s *BasicRTMPVideoStream) ReadRTMPFromStream(ctx context.Context, dst av.MuxCloser) (eof chan struct{}, err error)

ReadRTMPFromStream reads the content from the RTMP stream out into the dst.

func (BasicRTMPVideoStream) String 

func (s BasicRTMPVideoStream) String() string

func (BasicRTMPVideoStream) Width 

func (s BasicRTMPVideoStream) Width() int

func (*BasicRTMPVideoStream) WriteRTMPToStream 

func (s *BasicRTMPVideoStream) WriteRTMPToStream(ctx context.Context, src av.DemuxCloser) (eof chan struct{}, err error)

WriteRTMPToStream writes a video stream from src into the stream.

type Broadcaster 

type Broadcaster interface {
	Broadcast(seqNo uint64, data []byte) error
	IsLive() bool
	Finish() error
	String() string
}

Broadcaster takes a streamID and a reader, and broadcasts the data to whatever underlining network. Note the data param doesn't have to be the raw data. The implementation can choose to encode any struct. Example: 

s := GetStream("StrmID")
b := ppspp.NewBroadcaster("StrmID", s.Metadata())
for seqNo, data := range s.Segments() {
	b.Broadcast(seqNo, data)
}
b.Finish()

type HLSDemuxer 

type HLSDemuxer interface {
	PollPlaylist(ctx context.Context) (m3u8.MediaPlaylist, error)
	WaitAndPopSegment(ctx context.Context, name string) ([]byte, error)
	WaitAndGetSegment(ctx context.Context, name string) ([]byte, error)
}

type HLSMuxer 

type HLSMuxer interface {
	WriteSegment(seqNo uint64, name string, duration float64, s []byte) error
}

type HLSSegment 

type HLSSegment struct {
	SeqNo       uint64
	Name        string
	Data        []byte
	Duration    float64
	IsZeroFrame bool
}

We couldn't just use the m3u8 definition

type HLSVideoManifest 

type HLSVideoManifest interface {
	VideoManifest
	GetManifest() (*m3u8.MasterPlaylist, error)
	GetVideoStream(strmID string) (HLSVideoStream, error)
	// AddVideoStream(strmID string, variant *m3u8.Variant) (HLSVideoStream, error)
	AddVideoStream(strm HLSVideoStream, variant *m3u8.Variant) error
	GetStreamVariant(strmID string) (*m3u8.Variant, error)
	GetVideoStreams() []HLSVideoStream
	DeleteVideoStream(strmID string) error
}

type HLSVideoStream 

type HLSVideoStream interface {
	VideoStream
	GetStreamPlaylist() (*m3u8.MediaPlaylist, error)
	// GetStreamVariant() *m3u8.Variant
	GetHLSSegment(segName string) (*HLSSegment, error)
	AddHLSSegment(seg *HLSSegment) error
	SetSubscriber(f func(seg *HLSSegment, eof bool))
	End()
}

HLSVideoStream contains the master playlist, media playlists in it, and the segments in them. Each media playlist also has a streamID. You can only add media playlists to the stream.

type Queue 

type Queue struct {
	// contains filtered or unexported fields
}

Queue is the struct responsible for tracking the state of the queue.

func NewQueue 

func NewQueue(hint int64) *Queue

New is a constructor for a new threadsafe queue.

func (*Queue) Dispose 

func (q *Queue) Dispose() []interface{}

Dispose will dispose of this queue and returns the items disposed. Any subsequent calls to Get or Put will return an error.

func (*Queue) Disposed 

func (q *Queue) Disposed() bool

Disposed returns a bool indicating if this queue has had disposed called on it.

func (*Queue) Empty 

func (q *Queue) Empty() bool

Empty returns a bool indicating if this bool is empty.

func (*Queue) Get 

func (q *Queue) Get(number int64) ([]interface{}, error)

Get retrieves items from the queue. If there are some items in the queue, get will return a number UP TO the number passed in as a parameter. If no items are in the queue, this method will pause until items are added to the queue.

func (*Queue) Len 

func (q *Queue) Len() int64

Len returns the number of items in this queue.

func (*Queue) Peek 

func (q *Queue) Peek() (interface{}, error)

Peek returns a the first item in the queue by value without modifying the queue.

func (*Queue) Poll 

func (q *Queue) Poll(ctx context.Context, number int64, timeout time.Duration) ([]interface{}, error)

Poll retrieves items from the queue. If there are some items in the queue, Poll will return a number UP TO the number passed in as a parameter. If no items are in the queue, this method will pause until items are added to the queue or the provided timeout is reached. A non-positive timeout will block until items are added. If a timeout occurs, ErrTimeout is returned.

func (*Queue) Put 

func (q *Queue) Put(items ...interface{}) error

Put will add the specified items to the queue.

func (*Queue) TakeUntil 

func (q *Queue) TakeUntil(checker func(item interface{}) bool) ([]interface{}, error)

TakeUntil takes a function and returns a list of items that match the checker until the checker returns false. This does not wait if there are no items in the queue.

type RTMPEOF 

type RTMPEOF struct{}

type RTMPVideoStream 

type RTMPVideoStream interface {
	VideoStream
	ReadRTMPFromStream(ctx context.Context, dst av.MuxCloser) (eof chan struct{}, err error)
	WriteRTMPToStream(ctx context.Context, src av.DemuxCloser) (eof chan struct{}, err error)
	Close()
	Height() int
	Width() int
}

type Subscriber 

type Subscriber interface {
	Subscribe(ctx context.Context, gotData func(seqNo uint64, data []byte, eof bool)) error
	IsLive() bool
	Unsubscribe() error
	String() string
}

Subscriber subscribes to a stream defined by strmID. It returns a reader that contains the stream. Example 1: 

sub, metadata := ppspp.NewSubscriber("StrmID")
stream := NewStream("StrmID", metadata)
ctx, cancel := context.WithCancel(context.Background()
err := sub.Subscribe(ctx, func(seqNo uint64, data []byte){
	stream.WriteSeg(seqNo, data)
})
time.Sleep(time.Second * 5)
cancel()

Example 2: 

sub.Unsubscribe() //This is the same with calling cancel()

type VideoFormat 

type VideoFormat uint32

func MakeVideoFormatType 

func MakeVideoFormatType(base uint32) (c VideoFormat)

type VideoManifest 

type VideoManifest interface {
	GetManifestID() string
	GetVideoFormat() VideoFormat
	String() string
}

type VideoStream 

type VideoStream interface {
	AppData() AppData
	GetStreamID() string
	GetStreamFormat() VideoFormat
	String() string
}

Source Files

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