From 816c6469a20fccde22266f6bfabeea2fb8fb8f8a Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sat, 13 Feb 2016 23:08:01 +0900
Subject: [PATCH] doc: Update

---
 _docs/public/examples/piano.html | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/_docs/public/examples/piano.html b/_docs/public/examples/piano.html
index 50dd5a562..7517b4992 100644
--- a/_docs/public/examples/piano.html
+++ b/_docs/public/examples/piano.html
@@ -102,12 +102,18 @@ func (s *stream) Close() error {
     return nil
 }
 
-func addNote(freq float64, vol float64) {
+func addNote(freq float64, vol float64) error {
     f := int(freq)
     if n, ok := noteCache[f]; ok {
-        p := audio.NewPlayer(&amp;stream{bytes.NewReader(n)}, sampleRate)
+        p, err := audio.NewPlayer(&amp;stream{bytes.NewReader(n)}, sampleRate)
+        if err == audio.ErrTooManyPlayers {
+            return nil
+        }
+        if err != nil {
+            return err
+        }
         p.Play()
-        return
+        return nil
     }
     length := len(pcm) * baseFreq / f
     l := make([]int16, length)
@@ -123,8 +129,15 @@ func addNote(freq float64, vol float64) {
     }
     n := toBytes(l, r)
     noteCache[f] = n
-    p := audio.NewPlayer(&amp;stream{bytes.NewReader(n)}, sampleRate)
+    p, err := audio.NewPlayer(&amp;stream{bytes.NewReader(n)}, sampleRate)
+    if err == audio.ErrTooManyPlayers {
+        return nil
+    }
+    if err != nil {
+        return err
+    }
     p.Play()
+    return nil
 }
 
 var keys = []ebiten.Key{
@@ -217,7 +230,9 @@ func update(screen *ebiten.Image) error {
         if keyStates[key] != 1 {
             continue
         }
-        addNote(220*math.Exp2(float64(i-1)/12.0), 1.0)
+        if err := addNote(220*math.Exp2(float64(i-1)/12.0), 1.0); err != nil {
+            return err
+        }
     }
 
     screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})