Audio Simple Echo

Documentation

Class name: SaltAudioSimpleEcho
Category: SALT/Audio/Effect
Output node: False

The SaltAudioSimpleEcho node applies an echo effect to an audio input, allowing for customization of the number of echoes, the delay between them, and the decay factor of each subsequent echo. This node enhances audio tracks by adding depth and spatial effects through controlled repetition.

Input types

Required

audio
- The primary audio input to which the echo effect will be applied. It serves as the base for generating echoes.
- Comfy dtype: AUDIO
- Python dtype: bytes
times
- Specifies the number of times the echo effect is applied, influencing the richness and complexity of the resulting audio.
- Comfy dtype: INT
- Python dtype: int
delay_ms
- The delay in milliseconds between each echo, determining the temporal spacing of the echoes.
- Comfy dtype: INT
- Python dtype: int
decay_factor
- Controls the reduction in volume of each subsequent echo, affecting the fade-out effect over time.
- Comfy dtype: FLOAT
- Python dtype: float

Output types

audio
- Comfy dtype: AUDIO
- The modified audio output with the applied echo effect, showcasing the depth and spatial enhancements.
- Python dtype: bytes

Usage tips

Infra type: CPU
Common nodes: unknown

Source code

class SaltAudioSimpleEcho:
    @classmethod
    def INPUT_TYPES(cls):
        return {
            "required": {
                "audio": ("AUDIO", {}),
                "times": ("INT", {"default": 3, "min": 1, "max": 10}),
                "delay_ms": ("INT", {"default": 100, "min": 100, "max": 2000}),
                "decay_factor": ("FLOAT", {"default": 0.4, "min": 0.1, "max": 0.9, "step": 0.01}),
            },
        }

    RETURN_TYPES = ("AUDIO",)
    RETURN_NAMES = ("audio",)
    FUNCTION = "apply_echo"
    CATEGORY = "SALT/Audio/Effect"

    def apply_echo(self, audio, times, delay_ms, decay_factor):
        original = AudioSegment.from_file(io.BytesIO(audio), format="wav")
        silence = AudioSegment.silent(duration=delay_ms)
        echo = original
        fade_duration = int(delay_ms * 0.1)
        speed_increase_factor = 1.01
        speed_increase_step = 0.01

        for i in range(1, times):
            decayed = original - (decay_factor * 10 * i)
            playback_speed = speed_increase_factor + (speed_increase_step * i)
            decayed = decayed.speedup(playback_speed=playback_speed)
            for j in range(1, 5):
                decayed = decayed.overlay(silence + decayed - (5 * j), position=50 * j)
            decayed_with_fades = decayed.fade_in(fade_duration).fade_out(fade_duration)
            echo = echo.overlay(silence + decayed_with_fades, position=delay_ms * i)

        return (get_buffer(echo),)

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