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This is a tool that can convert the content in iidx hdd into osu!mania beatmaps.

1. Modify Root in Program.cs to the root directory of the hdd. The directory structure should be as follows:

   - content
       - data
           - font
           - graphic
           - info
           - movie
           - qc
           - sound
       - dev
       - modules
       - prop

2. Modify ResultPath in Converter/OsuConverter.cs to the folder where you want to save the output.

3. Use bemaniutils to unpack the .ifs files in path/to/hdd/contents/data/sound.

   cd path/to/hdd/contents/data/sound
   for i in `ls *.ifs`; do
       path/to/bemaniutils/ifsutils $i -d .
   done

1. First, the program reads the music_data.bin file to get information about all the songs.
2. Since some of the letters in the song names in music_data.bin are replaced with question marks (0x3f), the program reads video_music_list.xml to get the complete names of the songs.
3. Songs with multiple sample sets (.2dx, .s3p) are filtered out (this is because I couldn't find the mapping between difficulty and sample set).
4. For each song (this process is parallelized):
   1. Parse the beatmap (.1) file.
   2. Get the intersection of all the beatmap samples.
   3. Generate the main audio file (.mp3) from the intersection.
   4. Copy the main audio file and the complement of the samples to the output folder.
   5. Generate .osu files (including 7k, 8k, and 16k beatmaps).

Note: Intermediate files generated during the process are also saved as cache in the output folder, so you can safely terminate/re-run the program.

You can find all the beatmap files and audio files in ResultPath. The ResultPath/osu folder contains all the generated osu!mania beatmap files. You can copy all the files in this folder to the osu!/Songs directory and use F5 in the game to refresh the song list.