{decoder,player}/Control: add ReplayGain{Config,Mode} attributes

Don't use the global variables in class DecoderBridge; instead,
forward these values to the decoder thread via PlayerControl and
DecoderControl.

src/Partition.cxx

@@ -23,6 +23,7 @@
 #include "DetachedSong.hxx"
 #include "mixer/Volume.hxx"
 #include "IdleFlags.hxx"
+#include "ReplayGainGlobal.hxx"
 
 Partition::Partition(Instance &_instance,
 		     unsigned max_length,
@@ -50,6 +51,8 @@ Partition::UpdateEffectiveReplayGainMode(ReplayGainMode mode)
 		    ? ReplayGainMode::TRACK
 		    : ReplayGainMode::ALBUM;
 
+	pc.LockSetReplayGain(replay_gain_config, mode);
+
 	outputs.SetReplayGainMode(mode);
 }
 

src/decoder/Bridge.cxx

@@ -30,7 +30,6 @@
 #include "pcm/PcmConvert.hxx"
 #include "tag/Tag.hxx"
 #include "AudioConfig.hxx"
-#include "ReplayGainGlobal.hxx"
 #include "Log.hxx"
 #include "input/InputStream.hxx"
 #include "util/ConstBuffer.hxx"
@@ -592,14 +591,14 @@ DecoderBridge::SubmitReplayGain(const ReplayGainInfo *new_replay_gain_info)
 		if (++serial == 0)
 			serial = 1;
 
-		if (ReplayGainMode::OFF != replay_gain_mode) {
-			ReplayGainMode rgm = replay_gain_mode;
+		if (ReplayGainMode::OFF != dc.replay_gain_mode) {
+			ReplayGainMode rgm = dc.replay_gain_mode;
 			if (rgm != ReplayGainMode::ALBUM)
 				rgm = ReplayGainMode::TRACK;
 
 			const auto &tuple = new_replay_gain_info->Get(rgm);
 			const auto scale =
-				tuple.CalculateScale(replay_gain_config);
+				tuple.CalculateScale(dc.replay_gain_config);
 			dc.replay_gain_db = 20.0 * log10f(scale);
 		}
 

src/decoder/DecoderControl.hxx

@@ -27,6 +27,8 @@
 #include "thread/Cond.hxx"
 #include "thread/Thread.hxx"
 #include "Chrono.hxx"
+#include "ReplayGainConfig.hxx"
+#include "ReplayGainMode.hxx"
 
 #include <exception>
 
@@ -156,6 +158,9 @@ struct DecoderControl {
 	 */
 	MusicPipe *pipe;
 
+	ReplayGainConfig replay_gain_config;
+	ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
+
 	float replay_gain_db = 0;
 	float replay_gain_prev_db = 0;
 

src/player/Control.hxx

@@ -26,6 +26,8 @@
 #include "thread/Thread.hxx"
 #include "CrossFade.hxx"
 #include "Chrono.hxx"
+#include "ReplayGainConfig.hxx"
+#include "ReplayGainMode.hxx"
 
 #include <exception>
 
@@ -167,6 +169,9 @@ struct PlayerControl {
 
 	CrossFadeSettings cross_fade;
 
+	ReplayGainConfig replay_gain_config;
+	ReplayGainMode replay_gain_mode = ReplayGainMode::OFF;
+
 	double total_play_time;
 
 	/**
@@ -463,6 +468,13 @@ public:
 		return cross_fade.mixramp_delay;
 	}
 
+	void LockSetReplayGain(const ReplayGainConfig &_config,
+			       ReplayGainMode _mode) {
+		const ScopeLock protect(mutex);
+		replay_gain_config = _config;
+		replay_gain_mode = _mode;
+	}
+
 	double GetTotalPlayTime() const {
 		return total_play_time;
 	}

src/player/Thread.cxx

@@ -342,6 +342,13 @@ Player::StartDecoder(MusicPipe &_pipe)
 	assert(queued || pc.command == PlayerCommand::SEEK);
 	assert(pc.next_song != nullptr);
 
+	{
+		/* copy ReplayGain parameters to the decoder */
+		const ScopeLock protect(pc.mutex);
+		dc.replay_gain_config = pc.replay_gain_config;
+		dc.replay_gain_mode = pc.replay_gain_mode;
+	}
+
 	SongTime start_time = pc.next_song->GetStartTime() + pc.seek_time;
 
 	dc.Start(new DetachedSong(*pc.next_song),