Converting .xm/.mod files to .wav in batch using MilkyTracker

convert.sh

#!/bin/bash -e

# adjust as needed, leave encode_ext empty to keep the wav files
encode_ext="opus"
function encode_func() {
	# $1: source file (wav)
	# $2: destination file
	opusenc --quiet --bitrate 64 "$1" "$2"
}

# delete source files after conversion
delete_src=1

# directory with the source files
src_dir="$1"

# where to find the patched milkytracker executable
milkytracker="$PWD/milkytracker/src/build/src/tracker/milkytracker"

##############

Xvfb :99 &>/dev/null &
export DISPLAY=:99

cd "$src_dir"
for file in *.xm *.mod *.it *.s3m; do
	[ -f "$file" ] || continue

	base="${file%.*}"
	wav="$base.wav"
	printf 'Processing "%s"\n\n' "$base"

	WAVCONV_INPUT="$file" WAVCONV_OUTPUT="$wav" $milkytracker || :
	[ -f "$wav" ] || continue # probably crashed, skip this one

	if [ -n "$encode_ext" ]; then
		encoded="$base.$encode_ext"
		encode_func "$wav" "$encoded"
		rm "$wav"
	fi

	[ "$delete_src" -eq 1 ] && rm "$file"
done


printf 'Finished.\n'
pkill -INT Xvfb
exit 0

milkytracker.patch

--- MilkyTracker-1.02.00/src/tracker/TrackerStartUp.cpp.bak	2018-07-21 13:12:08.460649307 +0200
+++ MilkyTracker-1.02.00/src/tracker/TrackerStartUp.cpp	2018-07-21 14:29:06.504803388 +0200
@@ -37,6 +37,7 @@
 #include "PlayerMaster.h"
 #include "SystemMessage.h"
 #include "version.h"
+#include "SectionHDRecorder.h"
 
 // Logo picture
 #if defined(__EXCLUDE_BIGLOGO__) || defined(__LOWRES__)
@@ -171,7 +172,7 @@
 
 void Tracker::startUp(bool forceNoSplash/* = false*/)
 {
-	bool noSplash = forceNoSplash ? true : !getShowSplashFlagFromDatabase();
+	bool noSplash = true;
 
 	// put up splash screen if desired
 	pp_uint32 startTime = PPGetTickCount();
@@ -210,6 +211,10 @@
 		settingsDatabaseCopy = NULL;
 	}
 
+	/**** put custom settings here ****/
+	settingsDatabase->store("HDRECORDER_MIXFREQ", 48000);
+	settingsDatabase->store("HDRECORDER_INTERPOLATION", 6);
+
 	// apply ALL settings, not just the different ones
 	applySettings(settingsDatabase, NULL, true, false);
 
@@ -244,4 +249,15 @@
 		SystemMessage systemMessage(*screen, SystemMessage::MessageSoundDriverInitFailed);
 		systemMessage.show();
 	}
+
+	PPSystemString tmp = getenv("WAVCONV_INPUT");
+	bool res = loadTypeFromFile(FileTypes::FileTypeSongAllModules, tmp);
+	if(!res)
+		exit(1);
+
+	//sectionSwitcher->showUpperSection(sectionHDRecorder);
+	tmp = getenv("WAVCONV_OUTPUT");
+	sectionHDRecorder->exportWAVAsFileName(tmp);
+
+	exit(0);
 }
--- MilkyTracker-1.02.00/src/milkyplay/drivers/sdl/AudioDriver_SDL.cpp.bak	2018-07-21 13:28:39.271357199 +0200
+++ MilkyTracker-1.02.00/src/milkyplay/drivers/sdl/AudioDriver_SDL.cpp	2018-07-21 13:32:30.196275672 +0200
@@ -78,6 +78,8 @@
 		return res;
 	}
 
+	return MP_OK;
+
 	wanted.freq = mixFrequency;
 	wanted.format = AUDIO_S16SYS;
 	wanted.channels = 2; /* 1 = mono, 2 = stereo */
--- MilkyTracker-1.02.00/src/tracker/TrackerInit.cpp.bak	2018-07-21 13:36:29.047590165 +0200
+++ MilkyTracker-1.02.00/src/tracker/TrackerInit.cpp	2018-07-21 14:06:27.971313330 +0200
@@ -1158,6 +1158,8 @@
 
 void Tracker::showMessageBoxSized(pp_int32 id, const PPString& caption, MessageBoxTypes type, pp_int32 width/* = -1*/, pp_int32 height/* = -1*/, bool update/* = true*/)
 {
+	printf("MessageBox: %s\n", static_cast<const char*>(caption));
+
 	if (messageBoxContainerGeneric)
 	{
 		delete messageBoxContainerGeneric;