add: add mp3, removed guild register slash commands

src/lib/buzzer.rs

@@ -1,13 +1,11 @@
 use std::collections::HashSet;
-use std::f32::consts::TAU;
-use std::io::Cursor;
 use std::sync::Arc;
 
 use serenity::all::{
     ButtonStyle, ChannelId, CreateActionRow, CreateButton, GuildId, MessageId, UserId,
 };
 use serenity::prelude::TypeMapKey;
-use songbird::input::{Input, RawAdapter};
+use songbird::input::Input;
 use tokio::sync::Mutex;
 
 pub const BUZZER_CUSTOM_ID: &str = "buzzer:press";
@@ -87,33 +85,11 @@ fn control_components(is_open: bool, session_ended: bool) -> Vec<CreateActionRow
     vec![CreateActionRow::Buttons(vec![buzzer, reset, lock, unlock])]
 }
 
-/// Produces a short, self-contained buzzer tone as stereo f32 PCM.
+/// Returns the bundled buzzer sound.
 pub fn buzzer_sound() -> Input {
-    const SAMPLE_RATE: u32 = 48_000;
-    const DURATION_SECONDS: f32 = 0.4;
-    const FREQUENCY_HZ: f32 = 180.0;
+    const BUZZ_MP3: &[u8] = include_bytes!("../../assets/buzz.mp3");
 
-    let sample_count = (SAMPLE_RATE as f32 * DURATION_SECONDS) as usize;
-    let mut pcm = Vec::with_capacity(sample_count * 2 * size_of::<f32>());
-
-    for sample_index in 0..sample_count {
-        let time = sample_index as f32 / SAMPLE_RATE as f32;
-        let progress = sample_index as f32 / sample_count as f32;
-        let attack = (time / 0.01).min(1.0);
-        let release = ((1.0 - progress) / 0.08).min(1.0);
-        let envelope = attack * release;
-
-        // Odd harmonics give the tone the rasp of a physical game-show buzzer.
-        let phase = TAU * FREQUENCY_HZ * time;
-        let value =
-            envelope * (phase.sin() + (3.0 * phase).sin() / 3.0 + (5.0 * phase).sin() / 5.0) * 0.32;
-
-        for _ in 0..2 {
-            pcm.extend_from_slice(&value.to_le_bytes());
-        }
-    }
-
-    RawAdapter::new(Cursor::new(pcm), SAMPLE_RATE, 2).into()
+    BUZZ_MP3.into()
 }
 
 /// The application's single active buzzer session.