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#!/usr/bin/env python3
# Simple .VAG to STREAM.BIN interleaving tool
# (C) 2021 spicyjpeg - MPL licensed
import sys
from warnings import warn
from struct import Struct
from itertools import zip_longest
from argparse import ArgumentParser, FileType
VAG_HEADER = Struct("> 4s I 4x 2I 12x 16s")
VAG_MAGIC = b"VAGp"
SAMPLE_RATE = 44100
BUFFER_SIZE = 26624 # (26624 / 16 * 28) / 44100 = 1.05 seconds
ALIGN_SIZE = 2048
## Helpers
def align(data, size):
chunks = (len(data) + size - 1) // size
return data.ljust(chunks * size, b"\x00")
def set_loop_flag(data):
last_block = bytearray(data[-16:])
last_block[1] = 0x03 # Jump to loop point + sustain
return data[:-16] + last_block
## .VAG file reader
def read_vag(_file, chunk_size):
with _file:
header = _file.read(VAG_HEADER.size)
(
magic,
version,
size,
sample_rate,
name
) = VAG_HEADER.unpack(header)
#if magic != VAG_MAGIC:
#raise RuntimeError(f"{_file.name} is not a valid .VAG file")
if sample_rate != SAMPLE_RATE:
warn(RuntimeWarning(f"{_file.name} sample rate is not {SAMPLE_RATE} Hz"))
for i in range(0, size, chunk_size):
chunk = _file.read(chunk_size)
if len(chunk) % 16:
warn(RuntimeWarning(f"{_file.name} is not 16-byte aligned, trimming"))
chunk = chunk[0:len(chunk) // 16 * 16]
chunk = set_loop_flag(chunk)
yield chunk.ljust(chunk_size, b"\x00")
## Main
def get_args():
parser = ArgumentParser(
description = "Generates interleaved stream data from one or more .VAG files."
)
parser.add_argument(
"input_file",
nargs = "+",
type = FileType("rb"),
help = f"mono input files for each channel (must be {SAMPLE_RATE} Hz .VAG)"
)
parser.add_argument(
"-o", "--output",
type = FileType("wb"),
default = "stream.bin",
help = "where to output converted stream data (stream.bin by default)",
metavar = "file"
)
parser.add_argument(
"-b", "--buffer-size",
type = int,
default = BUFFER_SIZE,
help = f"size of each interleaved chunk (one per channel, default {BUFFER_SIZE})",
metavar = "bytes"
)
parser.add_argument(
"-a", "--align",
type = int,
default = ALIGN_SIZE,
help = f"align each group of chunks to N bytes (default {ALIGN_SIZE})",
metavar = "bytes"
)
return parser.parse_args()
def main():
args = get_args()
if args.buffer_size % 16:
raise ValueError("buffer size must be a multiple of 16 bytes")
interleave = zip_longest(
*( read_vag(_file, args.buffer_size) for _file in args.input_file ),
fillvalue = b"\x00" * args.buffer_size
)
with args.output as _file:
for chunks in interleave:
data = b"".join(chunks)
_file.write(align(data, args.align))
if __name__ == "__main__":
main()
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