Balance audio a bit.

cmd/tins2021/app.go

@@ -63,18 +63,23 @@ func (a *app) Init(ctx ui.Context) error {
 	})
 	a.context.ShowMainMenu(ctx)
 
-	err := a.context.Audio.LoadSample(
+	if err := a.context.Audio.LoadSample(
 		"level_completed.mp3",
 		"level_game_over.mp3",
 		"level_new_high_score.mp3",
-		"menu_interaction.mp3",
-		"monster_jump.mp3",
 		"player_collect_heart.mp3",
 		"player_collect_star.mp3",
 		"player_hurt.mp3",
+	); err != nil {
+		log.Printf("failed to load samples; %v\n", err)
+	}
+	if err := a.context.Audio.LoadSampleVolume(-1, "menu_interaction.mp3"); err != nil {
+		log.Printf("failed to load samples; %v\n", err)
+	}
+	if err := a.context.Audio.LoadSampleVolume(-2,
+		"monster_jump.mp3",
 		"player_move.mp3",
-	)
-	if err != nil {
+	); err != nil {
 		log.Printf("failed to load samples; %v\n", err)
 	}
 

cmd/tins2021/audio.go

@@ -41,9 +41,13 @@ func NewAudioPlayer(resources ui.Resources, prefix string) *AudioPlayer {
 }
 
 func (p *AudioPlayer) LoadSample(name ...string) error {
+	return p.LoadSampleVolume(0, name...)
+}
+
+func (p *AudioPlayer) LoadSampleVolume(volume float64, name ...string) error {
 	var all error
 	for _, name := range name {
-		if _, err := p.openSample(name); err != nil {
+		if _, err := p.openSample(name, volume); err != nil {
 			all = ut.ErrCombine(all, errors.Wrap(err, "failed to open sample"))
 		}
 	}
@@ -53,7 +57,7 @@ func (p *AudioPlayer) LoadSample(name ...string) error {
 	return errors.WithMessage(all, "failed to open one or more samples")
 }
 
-func (p *AudioPlayer) openSample(name string) (Sample, error) {
+func (p *AudioPlayer) openSample(name string, volume float64) (Sample, error) {
 	sample, ok := p.Samples[name]
 	if ok {
 		return sample, nil
@@ -66,17 +70,22 @@ func (p *AudioPlayer) openSample(name string) (Sample, error) {
 
 	buffer := beep.NewBuffer(format)
 	buffer.Append(stream)
-	sample = Sample{Buffer: buffer, SampleRate: format.SampleRate}
+	sample = Sample{Buffer: buffer, Volume: volume, SampleRate: format.SampleRate}
 	p.Samples[name] = sample
 	return sample, nil
 }
 
 func (p *AudioPlayer) PlaySample(name string) error {
-	sample, err := p.openSample(name)
+	sample, err := p.openSample(name, 0)
 	if err != nil {
 		return err
 	}
-	speaker.Play(p.resample(sample.Stream(), sample.SampleRate))
+	speaker.Play(&effects.Volume{
+		Streamer: p.resample(sample.Stream(), sample.SampleRate),
+		Base:     2,
+		Volume:   float64(sample.Volume),
+		Silent:   false,
+	})
 	return nil
 }
 
@@ -149,6 +158,7 @@ func (m Music) Finished(player *AudioPlayer) {
 type Sample struct {
 	*beep.Buffer
 
+	Volume     float64
 	SampleRate beep.SampleRate
 }