melgan/utils/plotting.py

import matplotlib
matplotlib.use("Agg")
import matplotlib.pylab as plt
import numpy as np


def save_figure_to_numpy(fig):
    # save it to a numpy array.
    data = np.fromstring(fig.canvas.tostring_rgb(), dtype=np.uint8, sep='')
    data = data.reshape(fig.canvas.get_width_height()[::-1] + (3,))
    data = np.transpose(data, (2, 0, 1))
    return data


def plot_waveform_to_numpy(waveform):
    fig, ax = plt.subplots(figsize=(12, 3))
    ax.plot()
    ax.plot(range(len(waveform)), waveform,
            linewidth=0.1, alpha=0.7, color='blue')

    plt.xlabel("Samples")
    plt.ylabel("Amplitude")
    plt.ylim(-1, 1)
    plt.tight_layout()

    fig.canvas.draw()
    data = save_figure_to_numpy(fig)
    plt.close()
    return data