From dc694dc5bf0f7aa9c050ff481a5dd2d8fca15588 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Thu, 28 Jan 2016 18:51:05 +0100
Subject: added support for seeking - not working yet...


diff --git a/player/player.go b/player/player.go
index cb613d4..8e6db21 100644
--- a/player/player.go
+++ b/player/player.go
@@ -73,6 +73,15 @@ type stopRequest struct {
 	response chan<- stopResult
 }
 
+type seekResult struct {
+	err error
+}
+
+type seekRequest struct {
+	pos      float64
+	response chan<- seekResult
+}
+
 type addUpdateHandlerResult struct {
 	err error
 }
@@ -116,11 +125,12 @@ type Player struct {
 	stdlog               *log.Logger
 	dbglog               *log.Logger
 	state                State
-	len                  time.Duration
+	duration             time.Duration
 	loadChan             chan loadRequest
 	playChan             chan playRequest
 	pauseChan            chan pauseRequest
 	stopChan             chan stopRequest
+	seekChan             chan seekRequest
 	updateChan           chan updateData
 	addUpdateHandlerChan chan addUpdateHandlerRequest
 	updateCBs            []*pUpdateCB
@@ -131,23 +141,23 @@ func (p *Player) onMessage(bus *gst.Bus, msg *gst.Message) {
 	case gst.MESSAGE_EOS:
 		p.pipe.SetState(gst.STATE_NULL)
 		p.state = IDLE
-		p.len = 0
-		p.updateChan <- updateData{len: p.len}
+		p.duration = 0
+		p.updateChan <- updateData{len: p.duration}
 	case gst.MESSAGE_WARNING:
 		warn, _ := msg.ParseWarning()
 		p.stdlog.Printf("GStreamer Pipeline Warning: %s", warn)
 	case gst.MESSAGE_ERROR:
 		p.pipe.SetState(gst.STATE_NULL)
 		p.state = IDLE
-		p.len = 0
-		p.updateChan <- updateData{len: p.len}
+		p.duration = 0
+		p.updateChan <- updateData{len: p.duration}
 		err, _ := msg.ParseError()
 		p.stdlog.Printf("GStreamer Pipeline Error: %s", err)
 	case gst.MESSAGE_ASYNC_DONE:
 		len, ok := p.pipe.QueryDuration(gst.FORMAT_TIME)
 		if ok {
-			p.len = time.Duration(len)
-			p.updateChan <- updateData{len: p.len}
+			p.duration = time.Duration(len)
+			p.updateChan <- updateData{len: p.duration}
 		} else {
 			p.stdlog.Printf("GStreamer Pipeline Error: unable to query duration of file")
 		}
@@ -161,7 +171,7 @@ func (p *Player) onMessage(bus *gst.Bus, msg *gst.Message) {
 			meter[i] = MeterChannel{Peak: peak[i].(float64), Decay: decay[i].(float64)}
 		}
 		pos := time.Duration(s.Data["stream-time"].(uint64))
-		p.updateChan <- updateData{len: p.len, pos: pos, meter: meter}
+		p.updateChan <- updateData{len: p.duration, pos: pos, meter: meter}
 	case gst.MESSAGE_STATE_CHANGED:
 	default:
 		p.dbglog.Printf("GStreamer Message: unknown type '%s'", msg.GetTypeName())
@@ -232,6 +242,17 @@ func (p *Player) stop() (resp stopResult) {
 	return
 }
 
+func (p *Player) seek(pos float64) (resp seekResult) {
+	postime := int64(float64(p.duration) * pos)
+	switch p.state {
+	case PLAYING:
+		fallthrough
+	case PAUSED:
+		p.pipe.SeekSimple(gst.FORMAT_TIME, gst.SEEK_FLAG_FLUSH|gst.SEEK_FLAG_KEY_UNIT, postime)
+	}
+	return
+}
+
 func (p *Player) addUpdateHandler(callback UpdateCB, userdata interface{}) (resp addUpdateHandlerResult) {
 	p.updateCBs = append(p.updateCBs, &pUpdateCB{callback, userdata})
 	return
@@ -262,6 +283,8 @@ func (p *Player) dispatchRequests() {
 			req.response <- p.pause()
 		case req := <-p.stopChan:
 			req.response <- p.stop()
+		case req := <-p.seekChan:
+			req.response <- p.seek(req.pos)
 		case req := <-p.addUpdateHandlerChan:
 			req.response <- p.addUpdateHandler(req.callback, req.userdata)
 		case u := <-p.updateChan:
@@ -330,6 +353,7 @@ type PlayerChan struct {
 	play             chan<- playRequest
 	pause            chan<- pauseRequest
 	stop             chan<- stopRequest
+	seek             chan<- seekRequest
 	addUpdateHandler chan addUpdateHandlerRequest
 }
 
@@ -387,6 +411,20 @@ func (p *PlayerChan) Stop() error {
 	return nil
 }
 
+func (p *PlayerChan) Seek(pos float64) error {
+	resCh := make(chan seekResult)
+	req := seekRequest{}
+	req.pos = pos
+	req.response = resCh
+	p.seek <- req
+
+	res := <-resCh
+	if res.err != nil {
+		return res.err
+	}
+	return nil
+}
+
 func (p *PlayerChan) AddUpdateHandler(callback UpdateCB, userdata interface{}) error {
 	resCh := make(chan addUpdateHandlerResult)
 	req := addUpdateHandlerRequest{}
@@ -408,6 +446,7 @@ func (p *Player) GetInterface() *PlayerChan {
 	ch.play = p.playChan
 	ch.pause = p.pauseChan
 	ch.stop = p.stopChan
+	ch.seek = p.seekChan
 	ch.addUpdateHandler = p.addUpdateHandlerChan
 	return ch
 }
@@ -415,7 +454,7 @@ func (p *Player) GetInterface() *PlayerChan {
 func NewPlayer(basepath string, stdlog *log.Logger, dbglog *log.Logger) (p *Player, err error) {
 	p = &Player{}
 	p.basepath = path.Clean(basepath)
-	p.len = 0
+	p.duration = 0
 	if stdlog != nil {
 		p.stdlog = stdlog
 	} else {
@@ -430,6 +469,7 @@ func NewPlayer(basepath string, stdlog *log.Logger, dbglog *log.Logger) (p *Play
 	p.playChan = make(chan playRequest)
 	p.pauseChan = make(chan pauseRequest)
 	p.stopChan = make(chan stopRequest)
+	p.seekChan = make(chan seekRequest)
 	p.updateChan = make(chan updateData, 20)
 	p.addUpdateHandlerChan = make(chan addUpdateHandlerRequest)
 
-- 
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