Revert "audio: bug fix: crash with uncomparable source"

This reverts commit e980d59191.

Reason: Compile error with Go 1.19

audio/audio.go

@@ -37,7 +37,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"reflect"
 	"runtime"
 	"sync"
 	"time"
@@ -189,15 +188,11 @@ func (c *Context) addPlayingPlayer(p *playerImpl) {
 	defer c.m.Unlock()
 	c.playingPlayers[p] = struct{}{}
 
-	if !reflect.ValueOf(p.sourceIdent()).Comparable() {
-		return
-	}
-
 	// Check the source duplication
 	srcs := map[any]struct{}{}
 	for p := range c.playingPlayers {
 		if _, ok := srcs[p.sourceIdent()]; ok {
-			c.err = errors.New("audio: the same source must not be used by multiple Player objects")
+			c.err = errors.New("audio: a same source is used by multiple Player")
 			return
 		}
 		srcs[p.sourceIdent()] = struct{}{}

audio/audio_test.go

@@ -16,7 +16,6 @@ package audio_test
 
 import (
 	"bytes"
-	"io"
 	"os"
 	"runtime"
 	"testing"
@@ -148,32 +147,4 @@ func TestNonSeekableSource(t *testing.T) {
 
 	p.Play()
 	p.Pause()
-
-	if err := audio.UpdateForTesting(); err != nil {
-		t.Error(err)
-	}
-}
-
-type uncomparableSource []int
-
-func (uncomparableSource) Read(buf []byte) (int, error) {
-	return 0, io.EOF
-}
-
-// Issue #3039
-func TestUncomparableSource(t *testing.T) {
-	setup()
-	defer teardown()
-
-	p, err := context.NewPlayer(uncomparableSource{})
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	p.Play()
-	p.Pause()
-
-	if err := audio.UpdateForTesting(); err != nil {
-		t.Error(err)
-	}
 }