83 lines
3.6 KiB
Python
83 lines
3.6 KiB
Python
#!/usr/bin/env python3
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# x-run: python3 % /mnt/windows/Users/user/Music/vgm/night-in-the-woods/2014-lost-constellation /tmp/lost-constellation.dfpwm
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from tempfile import TemporaryDirectory
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from subprocess import Popen, PIPE
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from sys import argv
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from pathlib import Path
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from os.path import splitext
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from math import ceil
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from re import search
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DFPWM_ENCODER_EXECUTABLE = "aucmp"
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FFMPEG_EXECUTABLE = "ffmpeg"
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FFPROBE_EXECUTABLE = "ffprobe"
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DFPWM_SAMPLE_RATE = 6000
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TAPE_SIZES = [ 2, 4, 8, 16, 32, 64, 128 ]
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input_folder = Path(argv[1])
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output_file = Path(argv[2])
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with TemporaryDirectory(prefix="tapedrive") as tmpdir_str:
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tmpdir = Path(tmpdir_str)
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filelist: list[Path] = []
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titles: list[bytes] = []
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for i, name in enumerate(input_folder.rglob("*.mp3")):
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if i >= 48:
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print(f"more than 48 tracks, skipping {name}")
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continue
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encoded_file = tmpdir / (splitext(name.name)[0] + ".dfpwm")
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filelist.append(encoded_file)
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with encoded_file.open("wb") as fout:
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with Popen([ FFPROBE_EXECUTABLE, name ], stderr=PIPE) as ffprobe:
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metadata: str = ffprobe.stderr.read().decode() # type: ignore
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if (match := search(r"title\s+: (.*)", metadata)):
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titles.append(match.groups()[0].encode("ascii", errors="ignore"))
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else:
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titles.append(splitext(name.name)[0].encode("ascii", errors="ignore"))
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with Popen([ DFPWM_ENCODER_EXECUTABLE ], stdout=fout, stdin=PIPE) as dfpwm:
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with Popen([ FFMPEG_EXECUTABLE, "-i", name, "-f", "s8", "-ac", "1",
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"-ar", "48k", "-" ], stdout=dfpwm.stdin) as ffmpeg:
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ffmpeg.wait()
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offset: int = 6000
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positions: list[tuple[int, int]] = []
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for file in filelist:
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size = ceil(file.stat().st_size / DFPWM_SAMPLE_RATE) * DFPWM_SAMPLE_RATE
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positions.append((offset, size))
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offset += size
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with output_file.open("wb") as fout:
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print("Writing header...")
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written_bytes: int = 0
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for i in range(48):
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name = (titles[i] if i < len(titles) else b"")[:117]
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pos = positions[i] if i < len(titles) else (0, 0)
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if i < len(titles):
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print(f"{i:2d} {pos[0]} + {pos[1]} {name}")
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written_bytes += fout.write(pos[0].to_bytes(4, "big"))
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written_bytes += fout.write(pos[1].to_bytes(4, "big"))
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written_bytes += fout.write(name)
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written_bytes += fout.write(b"\x00" * (117 - len(name)))
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if written_bytes != 6000:
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print(f"!!! expected 6000 bytes to be written in header, but it's {written_bytes}")
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print("Writing files...")
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for i, (pos, file) in enumerate(zip(positions, filelist)):
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print(f"Writing {file.name}")
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if written_bytes != pos[0]:
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print(f"!!! expected to be at {pos[0]}, rn at {written_bytes}")
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with file.open("rb") as fin:
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file_size: int = 0
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while (chunk := fin.read(DFPWM_SAMPLE_RATE)):
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file_size += fout.write(chunk)
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written_bytes += file_size
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padding_size = DFPWM_SAMPLE_RATE - (written_bytes % DFPWM_SAMPLE_RATE)
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written_bytes += fout.write(b"\x00" * padding_size)
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print("Use any of those tapes to store properly:")
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for size in filter(lambda sz: sz * DFPWM_SAMPLE_RATE * 60 >= written_bytes, TAPE_SIZES):
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print(f"{size} minutes ({size * DFPWM_SAMPLE_RATE * 60} bytes, {written_bytes * 100 / (size * DFPWM_SAMPLE_RATE * 60):7.3f}% used)")
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