filter/ReplayGain: convert pointers to references

src/filter/plugins/ReplayGainFilterPlugin.cxx

@@ -189,26 +189,26 @@ const FilterPlugin replay_gain_filter_plugin = {
 };
 
 void
-replay_gain_filter_set_mixer(PreparedFilter *_filter, Mixer *mixer,
+replay_gain_filter_set_mixer(PreparedFilter &_filter, Mixer *mixer,
 			     unsigned base)
 {
-	PreparedReplayGainFilter *filter = (PreparedReplayGainFilter *)_filter;
+	auto &filter = (PreparedReplayGainFilter &)_filter;
 
-	filter->SetMixer(mixer, base);
+	filter.SetMixer(mixer, base);
 }
 
 void
-replay_gain_filter_set_info(Filter *_filter, const ReplayGainInfo *info)
+replay_gain_filter_set_info(Filter &_filter, const ReplayGainInfo *info)
 {
-	ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
+	auto &filter = (ReplayGainFilter &)_filter;
 
-	filter->SetInfo(info);
+	filter.SetInfo(info);
 }
 
 void
-replay_gain_filter_set_mode(Filter *_filter, ReplayGainMode mode)
+replay_gain_filter_set_mode(Filter &_filter, ReplayGainMode mode)
 {
-	ReplayGainFilter *filter = (ReplayGainFilter *)_filter;
+	auto &filter = (ReplayGainFilter &)_filter;
 
-	filter->SetMode(mode);
+	filter.SetMode(mode);
 }

src/filter/plugins/ReplayGainFilterPlugin.hxx

@@ -35,7 +35,7 @@ class Mixer;
  * (including).
  */
 void
-replay_gain_filter_set_mixer(PreparedFilter *_filter, Mixer *mixer,
+replay_gain_filter_set_mixer(PreparedFilter &_filter, Mixer *mixer,
 			     unsigned base);
 
 /**
@@ -45,9 +45,9 @@ replay_gain_filter_set_mixer(PreparedFilter *_filter, Mixer *mixer,
  * gain data is available for the current song
  */
 void
-replay_gain_filter_set_info(Filter *filter, const ReplayGainInfo *info);
+replay_gain_filter_set_info(Filter &filter, const ReplayGainInfo *info);
 
 void
-replay_gain_filter_set_mode(Filter *filter, ReplayGainMode mode);
+replay_gain_filter_set_mode(Filter &filter, ReplayGainMode mode);
 
 #endif

src/output/Init.cxx

@@ -249,7 +249,7 @@ audio_output_setup(EventLoop &event_loop, AudioOutput &ao,
 
 	if (strcmp(replay_gain_handler, "mixer") == 0) {
 		if (ao.mixer != nullptr)
-			replay_gain_filter_set_mixer(ao.prepared_replay_gain_filter,
+			replay_gain_filter_set_mixer(*ao.prepared_replay_gain_filter,
 						     ao.mixer, 100);
 		else
 			FormatError(output_domain,

src/output/OutputThread.cxx

@@ -349,11 +349,11 @@ ao_chunk_data(AudioOutput *ao, const MusicChunk *chunk,
 	assert(data.size % ao->in_audio_format.GetFrameSize() == 0);
 
 	if (!data.IsEmpty() && replay_gain_filter != nullptr) {
-		replay_gain_filter_set_mode(replay_gain_filter,
+		replay_gain_filter_set_mode(*replay_gain_filter,
 					    ao->replay_gain_mode);
 
 		if (chunk->replay_gain_serial != *replay_gain_serial_p) {
-			replay_gain_filter_set_info(replay_gain_filter,
+			replay_gain_filter_set_info(*replay_gain_filter,
 						    chunk->replay_gain_serial != 0
 						    ? &chunk->replay_gain_info
 						    : nullptr);