108 lines
3.7 KiB
Python
108 lines
3.7 KiB
Python
"""节拍行者 — 音效合成（numpy 纯合成，不用 GPU）。
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产出 web/rhythm/audio/sfx/*.wav（44.1kHz mono），随后由 gen_convert.sh 转 ogg/m4a。
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指令提示音设计（6 种，听感区分度优先）：
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cue_up 上行双音 E5->A5（正弦，明亮上扬） → 上滑
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cue_down 下行双音 A5->E5（正弦，低沉下坠） → 下滑
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cue_left 单发低音 G4（三角波，浑厚） → 左滑
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cue_right 单发高音 G5（三角波，清脆） → 右滑
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cue_tap 单声短促 ping E6 → 单击
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cue_double 双声短促 ping E6（间隔 100ms） → 双击
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节拍器 / 判定反馈：
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tick / tick_accent 节拍器咔哒声（弱拍 / 强拍）
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judge_perfect 明亮风铃琶音
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judge_good 柔和单音
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judge_miss 低闷 buzz
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"""
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import os
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import numpy as np
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import soundfile as sf
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SR = 44100
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OUT = "/home/xsl/SoundGame/web/rhythm/audio/sfx"
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os.makedirs(OUT, exist_ok=True)
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def env(n, attack=0.004):
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"""起音 attack 秒 + 指数衰减到 -60dB 的包络。"""
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a = max(1, int(attack * SR))
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e = np.ones(n)
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e[:a] = np.linspace(0, 1, a)
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tail = np.exp(np.linspace(0, -6.9, n - a)) # 到末尾衰减约 60dB
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e[a:] = tail
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return e
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def tone(freq, dur, wave="sine", attack=0.004):
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n = int(dur * SR)
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t = np.arange(n) / SR
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ph = 2 * np.pi * freq * t
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if wave == "sine":
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x = np.sin(ph)
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elif wave == "tri":
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x = 2 * np.abs(2 * ((ph / (2 * np.pi)) % 1) - 1) - 1
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elif wave == "square":
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x = np.sign(np.sin(ph))
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else:
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raise ValueError(wave)
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return x * env(n, attack)
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def seq(notes, gap=0.0, wave="sine"):
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"""把若干 (freq, dur) 音符按 gap 间隔拼接。"""
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parts = []
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for f, d in notes:
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parts.append(tone(f, d, wave))
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if gap > 0:
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parts.append(np.zeros(int(gap * SR)))
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return np.concatenate(parts)
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def click(freq, dur, decay_ms):
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n = int(dur * SR)
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t = np.arange(n) / SR
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x = np.sin(2 * np.pi * freq * t) * np.exp(-t / (decay_ms / 1000))
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return x
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def norm(x, peak=0.7):
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m = np.max(np.abs(x))
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return x / m * peak if m > 0 else x
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SFX = {
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# 指令提示音
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"cue_up": seq([(659.25, 0.09), (880.0, 0.12)]), # E5 -> A5 上行
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"cue_down": seq([(880.0, 0.09), (659.25, 0.12)]), # A5 -> E5 下行
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"cue_left": norm(tone(392.0, 0.16, "tri")), # G4 低音
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"cue_right": norm(tone(783.99, 0.16, "tri")), # G5 高音
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"cue_tap": norm(click(1567.98, 0.06, 12)), # E6 单响
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"cue_double": norm(np.concatenate([ # E6 双响
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click(1567.98, 0.05, 12),
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np.zeros(int(0.05 * SR)),
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click(1567.98, 0.05, 12),
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])),
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# 节拍器
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"tick": norm(click(2093.0, 0.03, 6), 0.35), # 弱拍
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"tick_accent": norm(click(1760.0, 0.045, 10), 0.5), # 强拍
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# 判定反馈
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"judge_perfect": norm(np.concatenate([ # 明亮琶音 E6 G#6 B6
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tone(1318.51, 0.07), tone(1661.22, 0.07), tone(1975.53, 0.16),
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]) * 0.9, 0.65),
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"judge_good": norm(tone(880.0, 0.12), 0.5), # 柔和 A5
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"judge_miss": norm(tone(110.0, 0.22, "square", attack=0.002), 0.45), # 低闷 buzz
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}
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# cue 序列类再做整体归一（seq 内部未归一）
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for k in ("cue_up", "cue_down"):
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SFX[k] = norm(SFX[k])
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for name, x in SFX.items():
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path = os.path.join(OUT, name + ".wav")
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sf.write(path, x.astype(np.float32), SR)
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print(f"{name}: {len(x)/SR:.3f}s peak={np.max(np.abs(x)):.2f} -> {path}")
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print("ALL OK")
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