hook up replaygain config file options

backend/app.go

@@ -9,6 +9,7 @@ import (
 	"path"
 	"supersonic/backend/util"
 	"supersonic/player"
+	"supersonic/sharedutil"
 
 	"github.com/20after4/configdir"
 	"github.com/zalando/go-keyring"
@@ -51,6 +52,16 @@ func StartupApp() (*App, error) {
 	a.Config.LocalPlayback.Volume = clamp(a.Config.LocalPlayback.Volume, 0, 100)
 	a.Player.SetVolume(a.Config.LocalPlayback.Volume)
 
+	rgainOpts := []string{ReplayGainNone, ReplayGainAlbum, ReplayGainTrack}
+	if !sharedutil.StringSliceContains(rgainOpts, a.Config.ReplayGain.Mode) {
+		a.Config.ReplayGain.Mode = ReplayGainNone
+	}
+	a.Player.SetReplayGainOptions(player.ReplayGainOptions{
+		Mode:            player.ReplayGainMode(a.Config.ReplayGain.Mode),
+		PreventClipping: a.Config.ReplayGain.PreventClipping,
+		PreampGain:      a.Config.ReplayGain.PreampGainDB,
+	})
+
 	a.ServerManager = NewServerManager()
 	a.PlaybackManager = NewPlaybackManager(a.bgrndCtx, a.ServerManager, a.Player, &a.Config.Scrobbling)
 	a.LibraryManager = NewLibraryManager(a.ServerManager)

backend/config.go

@@ -58,6 +58,12 @@ type ScrobbleConfig struct {
 	ThresholdPercent     int
 }
 
+type ReplayGainConfig struct {
+	Mode            string
+	PreampGainDB    float64
+	PreventClipping bool
+}
+
 type Config struct {
 	Application    AppConfig
 	Servers        []*ServerConfig
@@ -69,6 +75,7 @@ type Config struct {
 	PlaylistPage   PlaylistPageConfig
 	LocalPlayback  LocalPlaybackConfig
 	Scrobbling     ScrobbleConfig
+	ReplayGain     ReplayGainConfig
 }
 
 func DefaultConfig() *Config {
@@ -106,6 +113,11 @@ func DefaultConfig() *Config {
 			ThresholdTimeSeconds: 240,
 			ThresholdPercent:     50,
 		},
+		ReplayGain: ReplayGainConfig{
+			Mode:            ReplayGainNone,
+			PreampGainDB:    0.0,
+			PreventClipping: true,
+		},
 	}
 }
 

backend/playbackmanager.go

@@ -12,6 +12,12 @@ import (
 	"github.com/dweymouth/go-subsonic/subsonic"
 )
 
+const (
+	ReplayGainNone  = string(player.ReplayGainNone)
+	ReplayGainAlbum = string(player.ReplayGainAlbum)
+	ReplayGainTrack = string(player.ReplayGainTrack)
+)
+
 type PlaybackManager struct {
 	ctx           context.Context
 	cancelPollPos context.CancelFunc