From 2c98fd94de0ef255e819c2f591a195edc2b026d2 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Wed, 13 Jan 2016 23:49:46 +0100
Subject: added simple state handling


diff --git a/player/player.go b/player/player.go
index 90c607c..5ab8f72 100644
--- a/player/player.go
+++ b/player/player.go
@@ -71,12 +71,21 @@ type stopRequest struct {
 	response chan<- stopResult
 }
 
+type State int
+
+const (
+	IDLE State = 1 + iota
+	PAUSED
+	PLAYING
+)
+
 type Player struct {
 	pipe      *gst.Element
 	bus       *gst.Bus
 	basepath  string
 	stdlog    *log.Logger
 	dbglog    *log.Logger
+	state     State
 	loadChan  chan loadRequest
 	playChan  chan playRequest
 	pauseChan chan pauseRequest
@@ -86,13 +95,15 @@ type Player struct {
 func (p *Player) onMessage(msg *gst.Message) {
 	switch msg.GetType() {
 	case gst.MESSAGE_EOS:
-		p.stdlog.Printf("GStreamer Pipeline: EOS reached!\n")
 		p.pipe.SetState(gst.STATE_NULL)
+		p.state = IDLE
+		p.stdlog.Printf("GStreamer Pipeline: EOS reached!\n")
 	case gst.MESSAGE_WARNING:
 		warn, _ := msg.ParseWarning()
 		p.stdlog.Printf("GStreamer Pipeline Warning: %s\n", warn)
 	case gst.MESSAGE_ERROR:
 		p.pipe.SetState(gst.STATE_NULL)
+		p.state = IDLE
 		err, _ := msg.ParseError()
 		p.stdlog.Printf("GStreamer Pipeline Error: %s\n", err)
 	case gst.MESSAGE_ASYNC_DONE:
@@ -127,23 +138,48 @@ func (p *Player) load(cart, cut uint) (resp loadResult) {
 	}
 	file.Close()
 
+	if p.state != IDLE {
+		p.pipe.SetState(gst.STATE_NULL)
+		p.state = IDLE
+	}
 	p.pipe.SetProperty("uri", "file://"+filename)
 	p.pipe.SetState(gst.STATE_PAUSED)
+	p.state = PAUSED
 	return
 }
 
 func (p *Player) play() (resp playResult) {
+	if p.state != PAUSED {
+		resp.err = fmt.Errorf("player: no file loaded")
+		return
+	}
 	p.pipe.SetState(gst.STATE_PLAYING)
+	p.state = PLAYING
 	return
 }
 
 func (p *Player) pause() (resp pauseResult) {
+	if p.state != PLAYING {
+		resp.err = fmt.Errorf("player: not playing")
+		return
+	}
 	p.pipe.SetState(gst.STATE_PAUSED)
+	p.state = PAUSED
 	return
 }
 
 func (p *Player) stop() (resp stopResult) {
-	p.pipe.SetState(gst.STATE_NULL)
+	switch p.state {
+	case IDLE:
+		p.pipe.SetState(gst.STATE_NULL)
+		p.state = IDLE
+	case PLAYING:
+		fallthrough
+	case PAUSED:
+		p.pipe.SetState(gst.STATE_NULL)
+		p.pipe.SetState(gst.STATE_PAUSED)
+		p.state = PAUSED
+	}
 	return
 }
 
-- 
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