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import matplotlib
import matplotlib.pyplot as plt
import matplotlib.animation
def make_playback_animation(savepath, spec, duration_ms, vmin=20, vmax=90):
fig, axs = plt.subplots()
axs.set_axis_off()
fig.set_size_inches((duration_ms / 1000 * 5, 5))
frames = []
frame_duration=20
num_frames = int(duration_ms / frame_duration + .99)
spec_height, spec_width = spec.shape
for i in range(num_frames):
xpos = (i - 1) / (num_frames - 3) * (spec_width - 1)
new_frame = axs.imshow(spec, cmap='inferno', origin='lower', aspect='auto', vmin=vmin, vmax=vmax)
if i in {0, num_frames - 1}:
frames.append([new_frame])
else:
line = axs.plot([xpos, xpos], [0, spec_height-1], color='white', alpha=0.8)[0]
frames.append([new_frame, line])
ani = matplotlib.animation.ArtistAnimation(fig, frames, blit=True, interval=frame_duration)
ani.save(savepath, dpi=720)
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