playback: re-add replaygain off mode

It was honestly foolish for me to recommend retagging.

Resolves #746.

app/src/main/java/org/oxycblt/auxio/IntegerTable.kt

@@ -102,7 +102,7 @@ object IntegerTable {
     /** Sort.Mode.ByDateAdded */
     const val SORT_BY_DATE_ADDED = 0xA118
     /** ReplayGainMode.Off (No longer used but still reserved) */
-    // const val REPLAY_GAIN_MODE_OFF = 0xA110
+    const val REPLAY_GAIN_MODE_OFF = 0xA110
     /** ReplayGainMode.Track */
     const val REPLAY_GAIN_MODE_TRACK = 0xA111
     /** ReplayGainMode.Album */

app/src/main/java/org/oxycblt/auxio/playback/replaygain/ReplayGain.kt

@@ -29,6 +29,8 @@ import org.oxycblt.auxio.R
  * @author Alexander Capehart (OxygenCobalt)
  */
 enum class ReplayGainMode {
+    /** Do not apply any ReplayGain adjustments. */
+    OFF,
     /** Apply the track gain, falling back to the album gain if the track gain is not found. */
     TRACK,
     /** Apply the album gain, falling back to the track gain if the album gain is not found. */
@@ -45,6 +47,7 @@ enum class ReplayGainMode {
          */
         fun fromIntCode(intCode: Int) =
             when (intCode) {
+                IntegerTable.REPLAY_GAIN_MODE_OFF -> OFF
                 IntegerTable.REPLAY_GAIN_MODE_TRACK -> TRACK
                 IntegerTable.REPLAY_GAIN_MODE_ALBUM -> ALBUM
                 IntegerTable.REPLAY_GAIN_MODE_DYNAMIC -> DYNAMIC

app/src/main/java/org/oxycblt/auxio/playback/replaygain/ReplayGainAudioProcessor.kt

@@ -119,6 +119,11 @@ constructor(
         // ReplayGain is configurable, so determine what to do based off of the mode.
         val resolvedAdjustment =
             when (playbackSettings.replayGainMode) {
+                // User wants no adjustment.
+                ReplayGainMode.OFF -> {
+                    logD("ReplayGain is off")
+                    null
+                }
                 // User wants track gain to be preferred. Default to album gain only if
                 // there is no track gain.
                 ReplayGainMode.TRACK -> {

app/src/main/res/values/settings.xml

@@ -139,12 +139,14 @@
     </integer-array>
 
     <string-array name="entries_replay_gain">
+        <item>@string/set_replay_gain_mode_off</item>
         <item>@string/set_replay_gain_mode_track</item>
         <item>@string/set_replay_gain_mode_album</item>
         <item>@string/set_replay_gain_mode_dynamic</item>
     </string-array>
 
     <integer-array name="values_replay_gain">
+        <item>@integer/replay_gain_off</item>
         <item>@integer/replay_gain_track</item>
         <item>@integer/replay_gain_album</item>
         <item>@integer/replay_gain_dynamic</item>
@@ -161,6 +163,7 @@
     <integer name="play_song_from_genre">0xA122</integer>
     <integer name="play_song_by_itself">0xA124</integer>
 
+    <integer name="replay_gain_off">0xA110</integer>
     <integer name="replay_gain_track">0xA111</integer>
     <integer name="replay_gain_album">0xA112</integer>
     <integer name="replay_gain_dynamic">0xA113</integer>

app/src/main/res/values/strings.xml

@@ -290,8 +290,9 @@
     <string name="set_repeat_pause_desc">Pause when a song repeats</string>
     <string name="set_remember_pause">Remember pause</string>
     <string name="set_remember_pause_desc">Remain playing/paused when skipping or editing queue</string>
-    <string name="set_replay_gain">ReplayGain</string>
+    <string name="set_replay_gain">Volume normalization</string>
     <string name="set_replay_gain_mode">ReplayGain strategy</string>
+    <string name="set_replay_gain_mode_off">Off</string>
     <string name="set_replay_gain_mode_track">Prefer track</string>
     <string name="set_replay_gain_mode_album">Prefer album</string>
     <string name="set_replay_gain_mode_dynamic">Prefer album if one is playing</string>