Start to sketch out a Playlist interface/struct

main.go

@@ -86,6 +86,7 @@ func (s *MP3HTTPSegmenter) Segment(r io.Reader) (chan *Segment, error) {
 			}
 
 			if s == nil {
+				// TODO what is a good initial capacity?
 				s = newSegment(DefaultTargetDuration, 1024)
 			}
 
@@ -110,13 +111,38 @@ func newMP3HTTPSegmenter() *MP3HTTPSegmenter {
 	return &MP3HTTPSegmenter{}
 }
 
-// TODO
+type Playlist interface {
+	// These could be moved to an interface?
+	Duration() time.Duration
+	TargetDuration() time.Duration
+}
 
-// A Segmenter class which allows the passing in of a Reader
-// i.e.
-// Segment(r io.Reader) (chan *Segment, error)
-// This will create an mp3.NewDecoder(r) and store the returned decoder.
-// As the Reader is read, the Segmenter will publish a stream of SegmentEvents
+type MediaPlaylist struct {
+	Segments []*Segment
+}
+
+func newMediaPlaylist() *MediaPlaylist {
+	return &MediaPlaylist{
+		Segments: make([]*Segment, 0, 10),
+	}
+}
+
+func (p *MediaPlaylist) Duration() time.Duration {
+	var t time.Duration
+	for _, s := range p.Segments {
+		t += s.Duration()
+	}
+	return t
+}
+
+func (p *MediaPlaylist) Run() error {
+	for {
+		// TODO block here and listen to the channel of incoming segments.
+		// As the reader is Read and segments are produced, update the Playlist
+		// struct and possibly notify consumers.
+		// What would actually be a useful API and/or Go best practices?
+	}
+}
 
 func main() {
 	// TODO accept some flags with: