72 lines
2.7 KiB
GDScript3
72 lines
2.7 KiB
GDScript3
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extends SceneTree
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const OUTPUT_DIRECTORY := "res://sound/dialogue/animalese/placeholder"
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const SAMPLE_RATE: int = 22050
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const SAMPLE_SECONDS: float = 0.055
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const CHARACTERS := "abcdefghijklmnopqrstuvwxyz"
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const VOWELS := "aeiou"
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func _initialize() -> void:
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var absolute_directory := ProjectSettings.globalize_path(OUTPUT_DIRECTORY)
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var directory_error: Error = DirAccess.make_dir_recursive_absolute(
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absolute_directory
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)
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if directory_error != OK:
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push_error("Could not create animalese sample directory.")
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quit(1)
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return
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for character_index: int in range(CHARACTERS.length()):
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var character := CHARACTERS.substr(character_index, 1)
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_save_sample(character, character_index)
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_save_sample("fallback", CHARACTERS.length())
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quit()
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func _save_sample(sample_name: String, sample_index: int) -> void:
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var stream := _build_sample(sample_name, sample_index)
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var output_path := "%s/%s" % [OUTPUT_DIRECTORY, sample_name]
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var save_error: Error = stream.save_to_wav(output_path)
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if save_error != OK:
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push_error("Could not save animalese sample: %s" % sample_name)
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func _build_sample(sample_name: String, sample_index: int) -> AudioStreamWAV:
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var frame_count := roundi(SAMPLE_RATE * SAMPLE_SECONDS)
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var pcm := PackedByteArray()
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pcm.resize(frame_count * 2)
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var base_frequency := 245.0 + float(sample_index % 7) * 18.0
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var formant_one := 620.0 + float(sample_index % 5) * 85.0
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var formant_two := 1320.0 + float(sample_index % 6) * 115.0
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var is_vowel := VOWELS.contains(sample_name)
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var noise_seed := sample_index * 7919 + 104729
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for frame_index: int in range(frame_count):
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var time := float(frame_index) / SAMPLE_RATE
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var attack := minf(time / 0.004, 1.0)
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var release := minf((SAMPLE_SECONDS - time) / 0.014, 1.0)
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var envelope := maxf(minf(attack, release), 0.0)
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noise_seed = int(
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(noise_seed * 1103515245 + 12345) & 0x7fffffff
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)
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var noise := float(noise_seed % 65536) / 32767.5 - 1.0
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var voiced := (
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sin(TAU * base_frequency * time) * 0.42
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+ sin(TAU * base_frequency * 2.0 * time) * 0.16
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)
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var formants := (
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sin(TAU * formant_one * time) * 0.18
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+ sin(TAU * formant_two * time) * 0.10
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)
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var consonant_noise := noise * (0.08 if is_vowel else 0.24)
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var value := envelope * (voiced + formants + consonant_noise) * 0.72
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var signed_sample := clampi(roundi(value * 32767.0), -32768, 32767)
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var encoded_sample := signed_sample if signed_sample >= 0 else signed_sample + 65536
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pcm[frame_index * 2] = encoded_sample & 0xff
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pcm[frame_index * 2 + 1] = (encoded_sample >> 8) & 0xff
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var stream := AudioStreamWAV.new()
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stream.set("format", AudioStreamWAV.FORMAT_16_BITS)
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stream.mix_rate = SAMPLE_RATE
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stream.stereo = false
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stream.data = pcm
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return stream
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