Mercurial > touhou

annotate python/src/audio.rs @ 783:ec1e06402a97

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Replace SDL2_mixer with the kira crate
author Link Mauve <linkmauve@linkmauve.fr>
date Fri, 21 Nov 2025 10:21:59 +0100
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ec1e06402a97 Replace SDL2_mixer with the kira crate
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1 use kira::sound::static_sound::StaticSoundData;
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2 use kira::sound::streaming::{StreamingSoundData, StreamingSoundHandle};
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3 use kira::sound::FromFileError;
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4 use kira::{AudioManager, AudioManagerSettings, Tween};
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5 use pyo3::prelude::*;
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6 use std::collections::HashMap;
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7 use std::io::Cursor;
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8 use std::path::PathBuf;
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9
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10 #[pyclass(module = "libtouhou")]
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11 pub struct Audio {
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12 loader: Py<super::Loader>,
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13 manager: AudioManager,
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14 cache: HashMap<String, StaticSoundData>,
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15 bgms: [Option<(String, String)>; 4],
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16 current_music: Option<StreamingSoundHandle<FromFileError>>,
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17 }
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18
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19 #[pymethods]
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20 impl Audio {
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21 #[new]
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22 fn new(loader: Py<super::Loader>, bgms: [Option<(String, String)>; 4]) -> Audio {
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23 let manager =
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24 AudioManager::<kira::DefaultBackend>::new(AudioManagerSettings::default()).unwrap();
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25 let cache = HashMap::new();
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26 Audio {
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27 loader,
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28 manager,
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29 cache,
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30 bgms,
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31 current_music: None,
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32 }
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33 }
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34
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35 fn play_bgm(&mut self, py: Python, number: usize) {
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36 let Some((_name, filename)) = &self.bgms[number] else {
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37 eprintln!("Unspecified bgm number {number}");
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38 return;
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39 };
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40
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41 // Load the loop points corresponding to this bgm.
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42 let mut filename = PathBuf::from(filename);
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43 filename.set_extension("pos");
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44 let loader = self.loader.borrow(py);
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45 let loop_points = loader
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46 .get_loop_points(filename.file_name().unwrap().to_str().unwrap())
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47 .unwrap();
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48
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49 // Then try to open the music file.
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50 filename.set_extension("*");
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51 let path = loader
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52 .game_dir
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53 .clone()
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54 .and_then(|dir| Some(dir.join(&filename)))
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55 .unwrap_or(filename);
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56 let mut music = None;
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57 for path in glob::glob(path.to_str().unwrap())
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58 .unwrap()
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59 .map(Result::unwrap)
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60 .map(PathBuf::from)
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61 {
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62 match StreamingSoundData::from_file(&path) {
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63 Ok(sound) => {
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64 music = Some(sound);
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65 break;
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66 }
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67 Err(err) => {
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68 eprintln!("Error while opening {path:?} as a music file: {err:?}");
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69 continue;
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70 }
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71 }
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72 }
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73 let Some(music) = music else {
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74 eprintln!("Unable to find bgm, let’s keep the previous one playing…");
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75 return;
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76 };
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77
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78 // Stop the previous playing one.
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79 if let Some(current_music) = &mut self.current_music {
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80 current_music.stop(Tween::default());
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81 }
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82
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83 // And now we can start playing the new one!
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84 let mut current_music = self.manager.play(music).unwrap();
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85 // TODO: Fetch the sample rate from the file, instead of hardcoding it.
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86 current_music.set_loop_region(
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87 (loop_points.start as f64 / 44100.0)..(loop_points.end as f64 / 44100.0),
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88 );
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89 self.current_music = Some(current_music);
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90 }
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91
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92 fn play(&mut self, py: Python, name: &str) {
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93 let sound = self.cache.entry(name.to_string()).or_insert_with(|| {
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94 let loader = self.loader.borrow(py);
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95 let bytes = loader.get_file_internal(name).unwrap();
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96 let cursor = Cursor::new(bytes);
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97 StaticSoundData::from_cursor(cursor).unwrap()
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98 });
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99 self.manager.play(sound.clone()).unwrap();
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100 }
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101 }