app/README.md

@@ -1,9 +0,0 @@
-When a stream is fed in, generally the first thing that should be done is to
-analyze the stream to extract information about it. Information that should be
-extracted include:
-
-- Format
-
-- Streams
-	- Codec
-	- Offset

app/channels/channel.go

@@ -1,89 +1,61 @@
 package channels
 
 import (
-	"log"
+	"context"
+	"sync"
 
-	"github.com/cskr/pubsub"
+	"git.icedream.tech/icedream/uplink/app/streams"
-
-	"git.icedream.tech/icedream/uplink/app/media"
-	pubsubutil "git.icedream.tech/icedream/uplink/app/pubsub"
 )
 
 type Channel struct {
-	InputContainer *media.MediaStreamContainer
+	metadataLock    sync.RWMutex
-	InputStreams   map[string]*media.MediaStream
+	metadata        map[string]string
-
+	metadataChannel chan map[string]string
-	OutputContainers map[string]*media.MediaStreamContainer
+	Id              string
-	OutputStreams    map[string]*media.MediaStream
+	Name            string
-
+	Description     string
-	Events *pubsub.PubSub
+	MimeType        string
-}
+	InputStream     *streams.Stream
-
+	OutputStreams   map[string]ChannelOutputStream
-func (channel *Channel) AddInputStream(id string) *media.MediaStream {
-	stream := &media.MediaStream{
-		PubSubWriter: pubsubutil.NewPubSubWriter(),
-	}
-	channel.InputStreams[id] = stream
-	log.Println("New input stream", id)
-	channel.Events.Pub(id, "input_stream")
-	return stream
-}
-
-func (channel *Channel) AddOutputStream(id string) *media.MediaStream {
-	stream := &media.MediaStream{
-		PubSubWriter: pubsubutil.NewPubSubWriter(),
-	}
-	channel.OutputStreams[id] = stream
-	log.Println("New output stream", id)
-	channel.Events.Pub(id, "output_stream")
-	return stream
-}
-
-func (channel *Channel) AddOutputContainer(id string) *media.MediaStreamContainer {
-	stream := &media.MediaStreamContainer{
-		PubSubWriter: pubsubutil.NewPubSubWriter(),
-	}
-	channel.OutputContainers[id] = stream
-	log.Println("New output container", id)
-	channel.Events.Pub(id, "output_container")
-	return stream
 }
 
 func (channel *Channel) SetMetadata(data map[string]string) {
-	channel.Events.Pub(data, "metadata")
+	channel.metadataLock.Lock()
+	defer channel.metadataLock.Unlock()
+	channel.metadata = data
+	channel.metadataChannel <- data
 }
 
-func (channel *Channel) Metadata() chan map[string]string {
+func (channel *Channel) Metadata(ctx context.Context) <-chan map[string]string {
-	outC := make(chan map[string]string)
+	channel.metadataLock.Lock()
+	defer channel.metadataLock.Unlock()
+	metadataChan := make(chan map[string]string, 1)
+	if channel.metadata != nil {
+		metadataChan <- channel.metadata
+	}
 	go func() {
-		c := channel.Events.Sub("metadata")
+		for {
-	forloop:
-		for event := range c {
 			select {
-			case _, _ = <-outC:
+			case data, ok := <-channel.metadataChannel:
-				break forloop
+				if !ok {
-			case outC <- event.(map[string]string):
+					return
+				}
+				metadataChan <- data
+			case <-ctx.Done():
+				return
 			}
 		}
-		channel.Events.Unsub(c, "metadata")
 	}()
-	return outC
+	return metadataChan
 }
 
 func NewChannel() *Channel {
-	ps := pubsub.New(1)
-
-	inputContainer := pubsubutil.NewPubSubWriterForTopic(ps, "input_container")
-
 	return &Channel{
-		InputContainer: &media.MediaStreamContainer{
+		metadataChannel: make(chan map[string]string),
-			PubSubWriter: inputContainer,
+		OutputStreams:   map[string]ChannelOutputStream{},
-		},
-		InputStreams: map[string]*media.MediaStream{},
-
-		OutputContainers: map[string]*media.MediaStreamContainer{},
-		OutputStreams:    map[string]*media.MediaStream{},
-
-		Events: pubsub.New(1),
 	}
 }
+
+type ChannelOutputStream struct {
+	*streams.Stream
+}

app/channels/channel_manager.go

@@ -2,7 +2,6 @@ package channels
 
 import (
 	"errors"
-	"log"
 	"sync"
 
 	"github.com/cskr/pubsub"
@@ -22,10 +21,6 @@ func NewChannelManager() *ChannelManager {
 	return mgr
 }
 
-func (manager *ChannelManager) Events() *pubsub.PubSub {
-	return manager.pubsub
-}
-
 func (manager *ChannelManager) Channel(uuid string) *Channel {
 	manager.channelsLock.RLock()
 	defer manager.channelsLock.RUnlock()
@@ -48,7 +43,7 @@ func (manager *ChannelManager) Close(uuid string) (err error) {
 		return
 	}
 
-	manager.pubsub.Pub(uuid, "close")
+	manager.pubsub.Pub(manager.channels[uuid], "close")
 	delete(manager.channels, uuid)
 
 	return
@@ -63,11 +58,10 @@ func (manager *ChannelManager) Open(uuid string) (channel *Channel, err error) {
 		return
 	}
 
-	channel = NewChannel()
+	channel = &Channel{Id: uuid}
 	manager.channels[uuid] = channel
 
-	log.Println("Channel opened:", uuid)
+	manager.pubsub.Pub(channel, "open")
-	manager.pubsub.Pub(uuid, "open")
 
 	return
 }

app/media/codec_info.go

@@ -1,6 +1,6 @@
 package media
 
-type MediaStreamCodecInfo struct {
+type StreamCodecInfo struct {
 	CodecName string
 	Type      StreamMediaType
 }

app/media/demuxed_stream.go

@@ -0,0 +1,18 @@
+package media
+
+import (
+	"io"
+
+	"git.icedream.tech/icedream/uplink/app/pubsub"
+)
+
+type DemuxedStream struct {
+	StreamId  int
+	Pts       int64
+	CodecInfo StreamCodecInfo
+	pubsub    *pubsub.PubSubWriter
+}
+
+func (stream *DemuxedStream) Sub() io.ReadCloser {
+	return stream.pubsub.Sub()
+}

app/media/demuxer.go

@@ -10,20 +10,15 @@ import (
 )
 
 type Demuxer struct {
-	streams       chan *MediaStream
+	streams chan *DemuxedStream
-	err           chan error
+	err     chan error
-	containerInfo *MediaStreamContainerInfo
-}
-
-func (demuxer *Demuxer) ContainerInfo() *MediaStreamContainerInfo {
-	return demuxer.containerInfo
 }
 
 func (demuxer *Demuxer) Error() <-chan error {
 	return demuxer.err
 }
 
-func (demuxer *Demuxer) Streams() <-chan *MediaStream {
+func (demuxer *Demuxer) Streams() <-chan *DemuxedStream {
 	return demuxer.streams
 }
 
@@ -32,7 +27,7 @@ func Demux(r io.ReadCloser) (demuxer *Demuxer) {
 
 	demuxer = &Demuxer{
 		err:     make(chan error),
-		streams: make(chan *MediaStream),
+		streams: make(chan *DemuxedStream),
 	}
 
 	go func() {
@@ -71,12 +66,6 @@ func Demux(r io.ReadCloser) (demuxer *Demuxer) {
 		// ctx.Dump()
 		// fmt.Println("============================")
 
-		demuxer.containerInfo = &MediaStreamContainerInfo{
-			GlobalHeader: ctx.IsGlobalHeader(),
-			StartTime:    ctx.StartTime(),
-			//SDP: ctx.GetSDPString(),
-		}
-
 		// Find out order of streams and store info about them
 		streams := []*gmf.Stream{}
 		pubsubs := []*pubsub.PubSubWriter{}
@@ -89,24 +78,20 @@ func Demux(r io.ReadCloser) (demuxer *Demuxer) {
 			streamCodec := stream.CodecCtx()
 			streams = append(streams, stream)
 
-			switch streamCodec.Type() {
+			if stream.IsVideo() || stream.IsAudio() {
-			case gmf.AVMEDIA_TYPE_AUDIO, gmf.AVMEDIA_TYPE_VIDEO:
 				ps := pubsub.NewPubSubWriter()
-				dmxStream := &MediaStream{
+				dmxStream := &DemuxedStream{
-					MediaStreamInfo: MediaStreamInfo{
+					CodecInfo: StreamCodecInfo{
-						CodecInfo: MediaStreamCodecInfo{
+						CodecName: streamCodec.Codec().Name(),
-							CodecName: streamCodec.Codec().Name(),
-						},
-						Pts:      stream.Pts,
-						StreamId: i,
 					},
-					PubSubWriter: ps,
+					Pts:      stream.Pts,
+					StreamId: i,
+					pubsub:   ps,
 				}
 				defer ps.Close()
-				switch streamCodec.Type() {
+				if stream.IsVideo() {
-				case gmf.AVMEDIA_TYPE_VIDEO:
 					dmxStream.CodecInfo.Type = Video
-				case gmf.AVMEDIA_TYPE_AUDIO:
+				} else {
 					dmxStream.CodecInfo.Type = Audio
 				}
 				pubsubMap[i] = ps

app/media/demuxer_test.go

@@ -17,7 +17,7 @@ func Test_Demux(t *testing.T) {
 			defer reader.Close()
 
 			demuxer := Demux(reader)
-			var audioStream *MediaStream
+			var audioStream *DemuxedStream
 			var err error
 		forloop:
 			for {
@@ -47,7 +47,7 @@ func Test_Demux(t *testing.T) {
 			defer reader.Close()
 
 			demuxer := Demux(reader)
-			var audioStream, videoStream *MediaStream
+			var audioStream, videoStream *DemuxedStream
 			var err error
 		forloop:
 			for {

app/media/media_stream.go

@@ -1,8 +0,0 @@
-package media
-
-import "git.icedream.tech/icedream/uplink/app/pubsub"
-
-type MediaStream struct {
-	*pubsub.PubSubWriter
-	MediaStreamInfo
-}

app/media/media_stream_container.go

@@ -1,8 +0,0 @@
-package media
-
-import "git.icedream.tech/icedream/uplink/app/pubsub"
-
-type MediaStreamContainer struct {
-	*pubsub.PubSubWriter
-	MediaStreamContainerInfo
-}

app/media/media_stream_container_info.go

@@ -1,7 +0,0 @@
-package media
-
-type MediaStreamContainerInfo struct {
-	GlobalHeader bool
-	StartTime    int
-	//SDP string
-}

app/media/media_stream_info.go

@@ -1,7 +0,0 @@
-package media
-
-type MediaStreamInfo struct {
-	StreamId  int
-	Pts       int64
-	CodecInfo MediaStreamCodecInfo
-}

app/media/muxer_test.go

@@ -16,7 +16,7 @@ func Test_Muxer(t *testing.T) {
 			defer reader.Close()
 
 			demuxer := Demux(reader)
-			var audioStream *MediaStream
+			var audioStream *DemuxedStream
 			var err error
 		forloop:
 			for {

app/pubsub/pubsubreader.go

@@ -11,13 +11,11 @@ type PubSubReader struct {
 	channel chan interface{}
 	buf     []byte
 	closed  bool
-	topic   string
 }
 
 func NewPubSubReader(ps *cskrpubsub.PubSub, topic string) *PubSubReader {
 	return &PubSubReader{
 		pubsub:  ps,
-		topic:   topic,
 		channel: ps.Sub(topic),
 	}
 }
@@ -61,6 +59,6 @@ func (r *PubSubReader) Read(p []byte) (n int, err error) {
 
 func (r *PubSubReader) Close() (err error) {
 	r.closed = true
-	r.pubsub.Unsub(r.channel, r.topic)
+	r.pubsub.Unsub(r.channel, "")
 	return
 }

app/pubsub/pubsubwriter.go

@@ -45,14 +45,14 @@ func (pipe *PubSubWriter) Close() (err error) {
 	pipe.PubSub.Close(pipe.topic)
 	if pipe.fullControl {
 		pipe.PubSub.Shutdown()
+		pipe.closed = true
 	}
-	pipe.closed = true
 	return
 }
 
 func (pipe *PubSubWriter) Sub() io.ReadCloser {
 	return &PubSubReader{
-		channel: pipe.PubSub.Sub(pipe.topic),
+		channel: pipe.PubSub.Sub(""),
 		pubsub:  pipe.PubSub,
 		closed:  pipe.closed,
 	}

app/server.go

@@ -3,7 +3,6 @@ package app
 import (
 	"log"
 
-	"git.icedream.tech/icedream/uplink/app/authentication"
 	"git.icedream.tech/icedream/uplink/app/channels"
 	"git.icedream.tech/icedream/uplink/app/servers/http"
 	"git.icedream.tech/icedream/uplink/plugins"
@@ -11,7 +10,6 @@ import (
 
 type App struct {
 	Server         *httpserver.Server
-	Authenticator  authentication.Authenticator
 	ChannelManager *channels.ChannelManager
 
 	plugins []plugins.PluginInstance
@@ -20,7 +18,6 @@ type App struct {
 func New() *App {
 	return &App{
 		Server:         httpserver.NewServer(),
-		Authenticator:  new(authentication.DummyAuthenticator),
 		ChannelManager: channels.NewChannelManager(),
 
 		plugins: []plugins.PluginInstance{},
@@ -28,26 +25,16 @@ func New() *App {
 }
 
 func (app *App) UsePlugin(plugin *plugins.Plugin) {
-	pluginInstance := plugin.Run()
+	instance := plugin.Run()
-
+	app.plugins = append(app.plugins, instance)
-	if p, ok := pluginInstance.(plugins.ServerPlugin); ok {
+	log.Println("Plugin loaded:", plugin.Descriptor.Name)
-		p.SetServer(app.Server)
-	}
-	if p, ok := pluginInstance.(plugins.ChannelPlugin); ok {
-		p.SetChannelManager(app.ChannelManager)
-	}
-	if p, ok := pluginInstance.(plugins.AuthenticatorPlugin); ok {
-		p.SetAuthenticator(app.Authenticator)
-	}
-
-	log.Println("Plugin initialized:", plugin.Descriptor.Name)
-
-	app.plugins = append(app.plugins, pluginInstance)
 }
 
 func (app *App) Init() {
 	for _, plugin := range app.plugins {
-		plugin.Init()
+		if p, ok := plugin.(plugins.ServerPlugin); ok {
+			p.SetServer(app.Server)
+		}
 	}
 }
 

app/servers/http/server.go

@@ -6,10 +6,6 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-const (
-	ServerHeaderValue = "Uplink/0.0.0"
-)
-
 type Server struct {
 	Http   *http.Server
 	Router *gin.Engine

app/streams/metadata_injector.go

@@ -5,63 +5,58 @@ import (
 )
 
 type MetadataInjector struct {
-	io.Writer
+	io.Reader
-	offset           int
 	MetadataInterval int
-	metadata         Metadata
+	blockOffset      int
+	Metadata         Metadata
+	metadataBuf      []byte
 }
 
-func NewMetadataInjector(w io.Writer, metadataInterval int) *MetadataInjector {
+func NewMetadataInjector(r io.Reader, metadataInterval int) *MetadataInjector {
 	return &MetadataInjector{
-		Writer:           w,
+		Reader:           r,
 		MetadataInterval: metadataInterval,
 	}
 }
 
-func (mi *MetadataInjector) SetMetadata(metadata Metadata) {
+func (mi *MetadataInjector) Read(data []byte) (n int, err error) {
-	mi.metadata = metadata
+	if mi.metadataBuf != nil && len(mi.metadataBuf) > 0 {
-}
+		bytesToRead := len(data)
-
+		if bytesToRead < len(mi.metadataBuf) {
-func (mi *MetadataInjector) writeMetadata() (n int, err error) {
+			// only read as much as possible
-	// the metadata generated here will be read on the next Read call
+			copy(data, mi.metadataBuf[0:bytesToRead])
-	metadataBytes := mi.metadata.Bytes()
+			n = bytesToRead
-	lenByte := (len(metadataBytes) + 15) / 16
+			mi.metadataBuf = mi.metadataBuf[bytesToRead:]
-	metadataBuf := make([]byte, int(lenByte)*16+1)
-	metadataBuf[0] = byte(lenByte)
-	copy(metadataBuf[1:], metadataBytes)
-
-	if len(mi.metadata) > 0 {
-		mi.metadata = Metadata{}
-	}
-
-	return mi.Writer.Write(metadataBuf)
-}
-
-func (mi *MetadataInjector) Write(data []byte) (n int, err error) {
-	for n < len(data) {
-		toWrite := mi.MetadataInterval - mi.offset
-
-		if toWrite <= 0 {
-			_, cerr := mi.writeMetadata()
-			//n += cn
-			if cerr != nil {
-				err = cerr
-				return
-			}
-			mi.offset = 0
-			// toWrite = mi.MetadataInterval
-			continue
-		}
-
-		outBytes := make([]byte, toWrite)
-		copy(outBytes, data[mi.offset:mi.offset+toWrite])
-		cn, cerr := mi.Writer.Write(outBytes)
-		n += cn
-		mi.offset += cn
-		if cerr != nil {
-			err = cerr
 			return
 		}
+		// read everything
+		copy(data, mi.metadataBuf)
+		n = len(mi.metadataBuf)
+		mi.metadataBuf = nil
+		return
+	}
+
+	bytesToRead := mi.MetadataInterval - mi.blockOffset
+	if bytesToRead > len(data) {
+		bytesToRead = len(data)
+	}
+	if bytesToRead > 0 {
+		n, err = mi.Reader.Read(data[0:bytesToRead])
+		if err != nil {
+			return
+		}
+		mi.blockOffset += n
+	}
+	if mi.blockOffset == mi.MetadataInterval {
+		// the metadata generated here will be read on the next Read call
+		metadataBytes := mi.Metadata.Bytes()
+		lenByte := byte((len(metadataBytes) + 15) / 16)
+		mi.metadataBuf = make([]byte, int(lenByte)*16+1)
+		mi.metadataBuf[0] = lenByte
+		copy(mi.metadataBuf[1:], metadataBytes)
+		mi.blockOffset = 0
+	} else if mi.blockOffset > mi.MetadataInterval {
+		panic("block offset higher than metadata interval, logical error")
 	}
 	return
 }

app/streams/metadata_injector_test.go

@@ -2,30 +2,17 @@ package streams
 
 import (
 	"bytes"
-	"io"
 	"testing"
 
 	. "github.com/smartystreets/goconvey/convey"
 )
 
 func Test_MetadataInjector(t *testing.T) {
-	metadata := Metadata{
+	reader := bytes.NewReader(make([]byte, 1024))
-		"StreamTitle": "Hello",
+	buffer := make([]byte, 128)
-	}
-	metadataLengthByte := (len(metadata.Bytes()) + 15) / 16
-	paddedMetadataLength := (metadataLengthByte * 16)
-	paddedMetadataBytes := make([]byte, paddedMetadataLength)
-	copy(paddedMetadataBytes, metadata.Bytes())
-
-	inputBytes := make([]byte, 1024)
-	reader := bytes.NewReader(inputBytes)
-	buffer := new(bytes.Buffer)
 
 	Convey("MetadataInjector", t, func() {
-		t.Log(len(metadata.Bytes()), "=>", paddedMetadataLength)
+		mi := NewMetadataInjector(reader, 192)
-
-		mi := NewMetadataInjector(buffer, 256)
-		mi.SetMetadata(metadata)
 
 		// 128
 		// 64
@@ -34,38 +21,41 @@ func Test_MetadataInjector(t *testing.T) {
 		// 64
 		// [metadata]
 
-		n, err := io.Copy(mi, reader)
+		n, err := mi.Read(buffer)
 		So(err, ShouldBeNil)
-		So(n, ShouldEqual, len(inputBytes))
+		So(n, ShouldEqual, 128)
-		So(buffer.Len(), ShouldEqual, len(inputBytes)+3+paddedMetadataLength)
 
-		outBytes := buffer.Bytes()
+		n, err = mi.Read(buffer)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 64)
 
-		for i := 0; i < 3; i++ {
+		n, err = mi.Read(buffer)
-			t.Log("part", i)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 1)
+		So(buffer[0], ShouldEqual, 0) // no metadata => zero length!
 
-			contentStartOffset := i + i*256
+		mi.Metadata = map[string]string{
-			if i > 0 {
+			"StreamTitle": "Testing",
-				contentStartOffset += paddedMetadataLength
-			}
-			t.Log("contentStartOffset", contentStartOffset)
-
-			contentEndOffset := contentStartOffset + 256
-			t.Log("contentEndOffset", contentEndOffset)
-
-			metadataEndOffset := contentEndOffset + 1
-			if i == 0 {
-				metadataEndOffset += paddedMetadataLength
-			}
-			t.Log("metadataEndOffset", metadataEndOffset)
-
-			So(outBytes[contentStartOffset:contentEndOffset], ShouldResemble, inputBytes[0:256])
-			if i == 0 {
-				So(outBytes[contentEndOffset], ShouldEqual, metadataLengthByte)
-				So(outBytes[contentEndOffset+1:metadataEndOffset], ShouldResemble, paddedMetadataBytes)
-			} else {
-				So(outBytes[contentEndOffset], ShouldEqual, 0)
-			}
 		}
+
+		n, err = mi.Read(buffer)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 128)
+
+		n, err = mi.Read(buffer)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 64)
+
+		n, err = mi.Read(buffer)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 1+32)
+		So(buffer[0], ShouldEqual, 2) // "StreamTitle='Testing';" => 22 bytes => quantized to 2 * 16 bytes
+		So(string(buffer[1:23]), ShouldEqual, "StreamTitle='Testing';")
+		So(buffer[1:23], ShouldResemble, []byte("StreamTitle='Testing';"))
+		So(buffer[24:32], ShouldResemble, make([]byte, 8)) // 8 zeroes
+
+		n, err = mi.Read(buffer)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 128)
 	})
 }

app/streams/stream.go

@@ -0,0 +1,151 @@
+package streams
+
+import (
+	"errors"
+	"io"
+	"log"
+	"runtime"
+	"sync"
+)
+
+type StreamDataChannel chan []byte
+type StreamCancelChannel chan interface{}
+
+type Stream struct {
+	burstSize int
+
+	burstLock sync.RWMutex
+	burst     []byte
+
+	subscribersLock sync.RWMutex
+	subscribers     []io.WriteCloser
+}
+
+func NewStream(burstSize int) *Stream {
+	return &Stream{
+		burstSize: burstSize,
+
+		subscribers: []io.WriteCloser{},
+	}
+}
+
+func (stream *Stream) Subscribe(wc io.WriteCloser) {
+	go func(wc io.WriteCloser) {
+		stream.subscribersLock.Lock()
+		defer stream.subscribersLock.Unlock()
+
+		// send burst data
+		stream.burstLock.RLock()
+		defer stream.burstLock.RUnlock()
+		if stream.burst != nil {
+			burstToSend := len(stream.burst)
+			for burstToSend > 0 {
+				burstSent, err := wc.Write(stream.burst)
+				if err != nil {
+					stream.unsubscribe(wc)
+					if err == io.EOF {
+						return // just end prematurely
+					}
+					log.Println("WARNING - Can not send burst data to subscriber:", err)
+					return
+				}
+				burstToSend -= burstSent
+			}
+		}
+
+		// now subscribe to live broadcast
+		stream.subscribers = append(stream.subscribers, wc)
+	}(wc)
+	runtime.Gosched()
+
+	return
+}
+
+func (stream *Stream) unsubscribe(wc io.WriteCloser) error {
+	stream.subscribersLock.Lock()
+	defer stream.subscribersLock.Unlock()
+	return stream.unsubscribeNoLock(wc)
+}
+
+func (stream *Stream) unsubscribeNoLock(wc io.WriteCloser) error {
+	// log.Println("About to remove subscriber", wc)
+	for index, subscriber := range stream.subscribers {
+		if subscriber == wc {
+			// log.Println("Removing subscriber", wc, "at", index)
+			stream.subscribers = append(stream.subscribers[0:index], stream.subscribers[index+1:]...)
+			// log.Println("We now have", len(stream.subscribers), "subscribers")
+			return subscriber.Close()
+		}
+	}
+	return errors.New("Tried to unsubscribe stream that is not registered as subscriber")
+}
+
+func (stream *Stream) SubscriberCount() int {
+	stream.subscribersLock.RLock()
+	defer stream.subscribersLock.RUnlock()
+
+	return len(stream.subscribers)
+}
+
+func (stream *Stream) Write(data []byte) (n int, err error) {
+	dataLength := len(data)
+
+	stream.burstLock.Lock()
+	defer stream.burstLock.Unlock()
+
+	stream.subscribersLock.RLock()
+	subscribers := make([]io.WriteCloser, len(stream.subscribers))
+	copy(subscribers, stream.subscribers)
+	defer stream.subscribersLock.RUnlock()
+
+	// Write data out to subscribers
+	for _, subscriber := range subscribers {
+		go func(subscriber io.WriteCloser) {
+			stream.subscribersLock.Lock()
+			defer stream.subscribersLock.Unlock()
+			// TODO - absolutely ensure data is sent in the correct order
+			totalWritten := 0
+			for totalWritten < dataLength {
+				currentWritten, err := subscriber.Write(data[totalWritten:])
+				if err != nil {
+					// just remove subscriber and go to next one
+					// log.Println("WARNING: Failed to write data to subscriber, removing subscriber:", err)
+					stream.unsubscribeNoLock(subscriber)
+					return
+				}
+				totalWritten += currentWritten
+			}
+		}(subscriber)
+	}
+	runtime.Gosched()
+
+	// Store data into burst buffer
+	if stream.burstSize > 0 {
+		if stream.burst == nil {
+			stream.burst = []byte{}
+		}
+		newBurst := append(stream.burst, data...)
+		if len(newBurst) > stream.burstSize {
+			newBurst = newBurst[len(newBurst)-stream.burstSize:]
+		}
+		stream.burst = newBurst
+	}
+
+	n = len(data)
+	err = nil
+
+	return
+}
+
+func (stream *Stream) Close() error {
+	stream.subscribersLock.RLock()
+	defer stream.subscribersLock.RUnlock()
+
+	for _, subscriber := range stream.subscribers {
+		if err := subscriber.Close(); err != nil {
+			log.Println("WARNING: Failed to close subscriber stream, ignoring:", err)
+		}
+	}
+
+	return nil
+}

app/streams/stream_test.go

@@ -0,0 +1,60 @@
+package streams
+
+import (
+	"io"
+	"runtime"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func Test_Stream(t *testing.T) {
+	Convey("Stream", t, func() {
+		stream := NewStream(4)
+
+		// it writes burst prefill
+		n, err := stream.Write([]byte{4, 5, 6, 7})
+		So(n, ShouldEqual, 4)
+		So(err, ShouldBeNil)
+		So(stream.burst, ShouldResemble, []byte{4, 5, 6, 7})
+
+		// it writes normally
+		n, err = stream.Write([]byte{0, 1, 2})
+		So(n, ShouldEqual, 3)
+		So(err, ShouldBeNil)
+		So(stream.burst, ShouldResemble, []byte{7, 0, 1, 2})
+
+		// it has working subscriptions
+		r, w := io.Pipe()
+		stream.Subscribe(w)
+
+		//So(target, ShouldHaveLength, 4)
+		data := make([]byte, 128)
+		n, err = r.Read(data)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 4)
+		So(data[0:4], ShouldResemble, []byte{7, 0, 1, 2})
+
+		n, err = stream.Write([]byte{0, 0, 0, 0, 1, 0, 255, 0})
+		So(n, ShouldEqual, 8)
+		So(err, ShouldBeNil)
+
+		//So(target, ShouldHaveLength, 8)
+		n, err = r.Read(data)
+		So(err, ShouldBeNil)
+		So(n, ShouldEqual, 8)
+		So(data[0:8], ShouldResemble, []byte{0, 0, 0, 0, 1, 0, 255, 0})
+
+		runtime.Gosched()
+
+		r.Close()
+		n, err = r.Read(data)
+		So(err, ShouldEqual, io.ErrClosedPipe)
+		So(n, ShouldEqual, 0)
+
+		n, err = stream.Write([]byte{8})
+		So(n, ShouldEqual, 1)
+		So(err, ShouldBeNil)
+		So(stream.SubscriberCount(), ShouldEqual, 0)
+	})
+}

app/streams/streamreader.go

@@ -0,0 +1,13 @@
+package streams
+
+import (
+	"io"
+)
+
+func NewStreamReader(stream *Stream) io.ReadCloser {
+	r, w := io.Pipe()
+
+	stream.Subscribe(w)
+
+	return r
+}

main.go

@@ -1,25 +1,119 @@
 package main
 
 import (
+	"io"
 	"log"
+	"net/http"
+	"strconv"
+	"time"
 
-	"git.icedream.tech/icedream/uplink/app"
+	"git.icedream.tech/icedream/uplink/app/streams"
-	"git.icedream.tech/icedream/uplink/plugins/icecast/output"
 	"git.icedream.tech/icedream/uplink/plugins/test/sine"
+
+	humanize "github.com/dustin/go-humanize"
+	"github.com/gorilla/mux"
+	"github.com/viert/lame"
 )
 
 func main() {
-	if err := run(); err != nil {
+	stream := streams.NewStream(128 * 1024)
-		log.Fatal(err)
-	}
-}
 
-func run() (err error) {
+	wr := lame.NewWriter(stream)
-	backend := app.New()
+	wr.Encoder.SetBitrate(192)
-	// backend.UsePlugin(icecast_input.Plugin)
+	wr.Encoder.SetQuality(1)
-	backend.UsePlugin(icecast_output.Plugin)
+	wr.Encoder.SetInSamplerate(44100)
-	backend.UsePlugin(sine.Plugin)
+	wr.Encoder.SetNumChannels(2)
-	backend.Init()
+	wr.Encoder.InitParams()
-	err = backend.Run()
+
-	return
+	go func() {
+		log.Println("Sine stream goroutine started")
+
+		sine := new(sine.SineStream)
+		sine.Samplerate = 44100
+		sine.Frequency = 990
+		sine.Beep = true
+		sine.Timestamp = time.Now()
+
+		log.Println("Will now broadcast sine stream")
+		n, err := io.Copy(wr, sine)
+		if err != nil {
+			log.Fatal("Sine stream copy failed:", err)
+		}
+		log.Println("Sine stream finished, written", humanize.Bytes(uint64(n)), "bytes")
+	}()
+
+	server := new(http.Server)
+	mux := mux.NewRouter()
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		log.Println("Got a listener")
+
+		w.Header().Set("content-type", "audio/mpeg")
+		w.Header().Set("server", "Uplink/0.0.0")
+		if r.Header.Get("icy-metadata") == "1" {
+			w.Header().Set("icy-metadata", "1")
+			w.Header().Set("icy-metaint", strconv.Itoa(2*1024))
+		}
+		w.WriteHeader(200)
+
+		cancel := w.(http.CloseNotifier).CloseNotify()
+
+		sr := streams.NewStreamReader(stream)
+		var n int64
+		var err error
+		if r.Header.Get("icy-metadata") == "1" {
+			mstream := streams.NewMetadataInjector(sr, 2*1024)
+			mstream.Metadata = map[string]string{
+				"StreamTitle": "beep",
+			}
+			go func() {
+				for {
+					select {
+					case <-cancel:
+						return
+					case <-time.After(time.Second):
+						mstream.Metadata["StreamTitle"] = "beep - time: " + time.Now().String()
+					}
+				}
+			}()
+			mstream.Metadata = map[string]string{
+				"StreamTitle": "DreamNetwork - Testing",
+			}
+			n, err = io.Copy(w, mstream)
+		} else {
+			n, err = io.Copy(w, sr)
+		}
+		log.Println("Transmitted", humanize.Bytes(uint64(n)))
+		if err != nil {
+			log.Println("Client transmission error:", err)
+		}
+
+		/*notify := w.(http.CloseNotifier).CloseNotify()
+		data := make([]byte, 4096)
+
+		log.Println("Start client tx loop")
+		for {
+			select {
+			case <-notify:
+				log.Println("Stop client tx loop")
+				sr.Close()
+				return
+			default:
+				n, err := sr.Read(data)
+				if err != nil {
+					log.Println("Read from stream failed:", err)
+					return
+				}
+				n, err = w.Write(data[0:n])
+				if err != nil {
+					log.Println("Write to client failed:", err)
+					log.Println("Stop client tx loop")
+					sr.Close()
+					return
+				}
+			}
+		}*/
+	})
+	server.Handler = mux
+	server.Addr = ":8080"
+	server.ListenAndServe()
 }

plugins/icecast/output/instance.go

@@ -1,27 +1,18 @@
 package icecast_output
 
 import (
-	"bytes"
-	"fmt"
 	"io"
-	"log"
-	"runtime"
 
 	"git.icedream.tech/icedream/uplink/app/authentication"
 	"git.icedream.tech/icedream/uplink/app/channels"
-	"git.icedream.tech/icedream/uplink/app/media"
 	"git.icedream.tech/icedream/uplink/app/servers/http"
-	"git.icedream.tech/icedream/uplink/app/streams"
-	humanize "github.com/dustin/go-humanize"
 	"github.com/gin-gonic/gin"
-	"github.com/glycerine/rbuf"
 )
 
 type pluginInstance struct {
 	server         *httpserver.Server
 	authenticator  authentication.Authenticator
 	channelManager *channels.ChannelManager
-	ringBuffers    map[string]map[string]*rbuf.FixedSizeRingBuf
 }
 
 func (instance *pluginInstance) SetAuthenticator(authenticator authentication.Authenticator) {
@@ -30,108 +21,28 @@ func (instance *pluginInstance) SetAuthenticator(authenticator authentication.Au
 
 func (instance *pluginInstance) SetChannelManager(channelManager *channels.ChannelManager) {
 	instance.channelManager = channelManager
-
-	go func() {
-		channelC := channelManager.Events().Sub("open")
-		log.Println("Burst cache: Now watching")
-		for c := range channelC {
-			channelId := c.(string)
-			go func(channel *channels.Channel) {
-				streamRbufMap := map[string]*rbuf.FixedSizeRingBuf{}
-				instance.ringBuffers[channelId] = streamRbufMap
-				outputContainerC := channel.Events.Sub("output_container")
-				log.Println("Burst cache: Now watching channel", channelId)
-				for c := range outputContainerC {
-					containerId := c.(string)
-					burstCache := rbuf.NewFixedSizeRingBuf(64 * 1024)
-					streamRbufMap[containerId] = burstCache
-					go func(container *media.MediaStreamContainer) {
-						r := container.Sub()
-						log.Println("Burst cache: Now watching container", containerId, "in channel", channelId)
-						io.Copy(burstCache, r)
-					}(channel.OutputContainers[containerId])
-					runtime.Gosched()
-				}
-			}(channelManager.Channel(channelId))
-			runtime.Gosched()
-		}
-	}()
-	runtime.Gosched()
-
-	// TODO - handle channel and container closure
 }
 
 func (instance *pluginInstance) SetServer(server *httpserver.Server) {
 	instance.server = server
-}
-
-func (instance *pluginInstance) Init() {
-	instance.ringBuffers = map[string]map[string]*rbuf.FixedSizeRingBuf{}
 
 	router := instance.server.Router
 
-	router.GET("/:channel/:container", func(ctx *gin.Context) {
+	router.PUT("/:channel", func(ctx *gin.Context) {
-		r := ctx.Request
+		channel := instance.channelManager.Channel(ctx.Param("channel"))
-		var mw *streams.MetadataInjector
-
-		channelId := ctx.Param("channel")
-		containerId := ctx.Param("container")
-		sendMetadata := r.Header.Get("icy-metadata") == "1"
-		metaInt := 16 * 1024
-
-		channel := instance.channelManager.Channel(channelId)
 		if channel == nil {
 			ctx.Status(404)
 			return
 		}
-
+		if user, password, ok := ctx.Request.BasicAuth(); ok {
-		container, ok := channel.OutputContainers[containerId]
+			if !instance.authenticator.VerifyUsernameAndPassword(channel, user, password) {
-		if !ok {
+				ctx.Status(401)
-			ctx.Status(404)
+				return
-		}
-
-		ctx.Writer.Header().Set("content-type", "audio/mpeg") // TODO
-		if sendMetadata {
-			ctx.Writer.Header().Set("icy-metadata", "1")
-			ctx.Writer.Header().Set("icy-metaint", fmt.Sprintf("%d", metaInt))
-		}
-		ctx.Writer.WriteHeader(200)
-
-		w := ctx.Writer
-		var nw io.Writer = w
-
-		sr := container.Sub()
-		defer sr.Close()
-
-		log.Println("Someone tuned in to", channelId, channel)
-
-		if sendMetadata {
-			mw = streams.NewMetadataInjector(w, metaInt)
-			nw = mw
-		}
-
-		if channelRbuf, ok := instance.ringBuffers[channelId]; ok {
-			if containerRbuf, ok := channelRbuf[containerId]; ok {
-				burst := containerRbuf.Bytes()
-				log.Println("Sending", humanize.Bytes(uint64(len(burst))), "burst")
-				_, err := io.Copy(nw, bytes.NewReader(burst))
-				if err != nil {
-					log.Println(err)
-					return
-				}
-			} else {
-				log.Println("No burst cache for", channelId, "/", containerId)
 			}
 		} else {
-			log.Println("No burst cache for", channelId)
+			ctx.Status(401)
-		}
+			return
-
-		_, err := io.Copy(nw, sr)
-		if err != nil {
-			log.Println(err)
 		}
+		io.Copy(channel.InputStream, ctx.Request.Body)
 	})
-
-	// TODO - output streams
-	// TODO - dynamic transcoding targets
 }

plugins/interfaces.go

@@ -1,20 +1,12 @@
 package plugins
 
 import (
-	"git.icedream.tech/icedream/uplink/app/authentication"
-	"git.icedream.tech/icedream/uplink/app/channels"
 	"git.icedream.tech/icedream/uplink/app/servers/http"
 )
 
 type PluginRunner func() PluginInstance
 
 type PluginInstance interface {
-	Init()
-}
-
-type AuthenticatorPlugin interface {
-	PluginInstance
-	SetAuthenticator(authentication.Authenticator)
 }
 
 type ServerPlugin interface {
@@ -24,5 +16,5 @@ type ServerPlugin interface {
 
 type ChannelPlugin interface {
 	PluginInstance
-	SetChannelManager(*channels.ChannelManager)
+	SetChannel(id string)
 }

plugins/test/sine/instance.go

@@ -11,56 +11,24 @@ import (
 )
 
 type pluginInstance struct {
-	channelManager *channels.ChannelManager
 }
 
 func (instance *pluginInstance) SetChannelManager(channelManager *channels.ChannelManager) {
-	instance.channelManager = channelManager
+	c, err := channelManager.Open("sine")
-}
+	if err != nil {
+		log.Println("ERROR: sine channel could not be opened:", err)
+		log.Println("Skipping sine channel creation")
+		return
+	}
 
-func (instance *pluginInstance) Init() {
+	wr := lame.NewWriter(c.InputStream)
-	channelManager := instance.channelManager
+	wr.Encoder.SetBitrate(192)
+	wr.Encoder.SetQuality(1)
+	wr.Encoder.SetInSamplerate(44100)
+	wr.Encoder.SetNumChannels(2)
+	wr.Encoder.InitParams()
 
 	go func() {
-		time.Sleep(2 * time.Second) // give burst cache a chance to realize
-
-		c, err := channelManager.Open("sine")
-		if err != nil {
-			log.Println("ERROR: sine channel could not be opened:", err)
-			log.Println("Skipping sine channel creation")
-			return
-		}
-
-		go func() {
-			lastTime := time.Now()
-			for {
-				lastTime = lastTime.Add(time.Second)
-				time.Sleep(time.Until(lastTime))
-
-				c.SetMetadata(map[string]string{
-					"StreamTitle": "beep - time: " + time.Now().String(),
-				})
-			}
-		}()
-
-		outputStream := c.AddOutputStream("mp3")
-		defer outputStream.Close()
-
-		outputContainer := c.AddOutputContainer("mp3")
-		defer outputContainer.Close()
-
-		w := io.MultiWriter(
-			outputContainer,
-			outputStream,
-		)
-
-		wr := lame.NewWriter(w)
-		wr.Encoder.SetBitrate(192)
-		wr.Encoder.SetQuality(1)
-		wr.Encoder.SetInSamplerate(44100)
-		wr.Encoder.SetNumChannels(2)
-		wr.Encoder.InitParams()
-
 		log.Println("Sine stream goroutine started")
 
 		sine := new(SineStream)