File size: 3,443 Bytes
d02c2a6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | import io
import os
import numpy as np
import av
from PIL import Image, ImageDraw
ARTWORK_DIR = os.path.dirname(os.path.abspath(__file__))
BACKGROUND_PATH = os.path.join(ARTWORK_DIR, "ostris_logo.jpg")
WAVEFORM_COLOR = (0xFB, 0xBF, 0x24, 230) # #fbbf24 at 90% opacity
ARTWORK_SIZE = 1024
def load_waveform(audio_path: str, num_samples: int = 512) -> np.ndarray:
"""Load audio and return a downsampled waveform envelope using PyAV."""
container = av.open(audio_path)
stream = container.streams.audio[0]
stream.codec_context.thread_type = "AUTO"
frames = []
for frame in container.decode(stream):
arr = frame.to_ndarray()
# mix down to mono
if arr.ndim > 1:
arr = arr.mean(axis=0)
frames.append(arr)
container.close()
audio = np.concatenate(frames)
# downsample to num_samples bins by taking max absolute value per bin
bin_size = len(audio) // num_samples
if bin_size == 0:
bin_size = 1
trimmed = audio[: bin_size * num_samples]
bins = trimmed.reshape(num_samples, bin_size)
envelope = np.max(np.abs(bins), axis=1)
# normalize to 0-1
peak = envelope.max()
if peak > 0:
envelope = envelope / peak
return envelope
def create_artwork(waveform: np.ndarray, size: int = ARTWORK_SIZE) -> Image.Image:
"""Create album artwork with logo background and waveform overlay."""
bg = Image.open(BACKGROUND_PATH).convert("RGBA").resize((size, size), Image.LANCZOS)
# draw waveform on separate overlay for alpha compositing
wave_overlay = Image.new("RGBA", (size, size), (0, 0, 0, 0))
draw = ImageDraw.Draw(wave_overlay)
num_bars = len(waveform)
padding = int(size * 0.02)
draw_w = size - 2 * padding
bar_width = max(1, draw_w / num_bars)
center_y = size // 2
max_amp = (size // 2) * 0.85 # leave a little margin
for i, amp in enumerate(waveform):
x = padding + i * bar_width
h = amp * max_amp
y_top = center_y - h
y_bot = center_y + h
draw.rectangle(
[x, y_top, x + bar_width - 1, y_bot],
fill=WAVEFORM_COLOR,
)
bg = Image.alpha_composite(bg, wave_overlay)
return bg.convert("RGB")
def add_album_artwork(song_path: str) -> None:
"""Add album artwork with waveform visualization to an MP3 file."""
from mutagen.id3 import ID3, APIC, ID3NoHeaderError
if not os.path.isfile(song_path):
raise FileNotFoundError(f"Audio file not found: {song_path}")
waveform = load_waveform(song_path)
artwork = create_artwork(waveform)
# encode artwork to JPEG bytes in memory
buf = io.BytesIO()
artwork.save(buf, format="JPEG", quality=85)
artwork_data = buf.getvalue()
# embed into MP3 via mutagen ID3 tags
try:
tags = ID3(song_path)
except ID3NoHeaderError:
tags = ID3()
tags.delall("APIC")
tags.add(
APIC(
encoding=3, # UTF-8
mime="image/jpeg",
type=3, # front cover
desc="Cover",
data=artwork_data,
)
)
tags.save(song_path, v2_version=3)
if __name__ == "__main__":
import argparse
parser = argparse.ArgumentParser(
description="Add album artwork with waveform to an MP3 file"
)
parser.add_argument("mp3", help="Path to the MP3 file")
args = parser.parse_args()
add_album_artwork(args.mp3)
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