44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
# Copyright (C) 2024 Reece H. Dunn. SPDX-License-Identifier: GPL-3
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import io
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import matplotlib.pyplot as plt
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import numpy as np
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import torch
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from PIL import Image
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def plot2image():
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buffer = io.BytesIO()
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plt.savefig(buffer, format="png")
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buffer.seek(0)
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image = Image.open(buffer)
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return torch.from_numpy(np.array(image).astype(np.float32) / 255.0).unsqueeze(0)
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class PlotWaveform:
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@classmethod
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def INPUT_TYPES(s):
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return {"required": {"audio": ("AUDIO",),
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"title": ("STRING", {"default": "Waveform"})}}
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CATEGORY = "AudioProcessing/plot"
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RETURN_TYPES = ("IMAGE", )
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FUNCTION = "plot"
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def plot(self, audio, title="Waveform"):
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waveform = audio["waveform"].movedim(0, -1).numpy()
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num_channels, num_frames, _ = waveform.shape
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time_axis = torch.arange(0, num_frames) / audio["sample_rate"]
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figure, axes = plt.subplots(num_channels, 1)
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if num_channels == 1:
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axes = [axes]
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for c in range(num_channels):
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axes[c].plot(time_axis, waveform[c], linewidth=1)
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axes[c].grid(True)
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if num_channels > 1:
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axes[c].set_title(f"Channel {c+1}")
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figure.suptitle(title)
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return (plot2image(), )
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