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surroundsep.py
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surroundsep.py
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#!/usr/bin/env python3
import argparse
import subprocess
import os
from pathlib import Path
import unicodedata
SUPPORTED_FILES = [
".wave",
".wav",
".flac",
".m4a",
] # TODO: .m4a might be lossy -> double check if codec is TrueHD
INSTALL_DIR = Path(__file__).parent.absolute()
PROCESS_DIR = os.getcwd()
parser = argparse.ArgumentParser()
parser.add_argument(
dest="POSITIONAL_INPUT_PATH", nargs="?", help="the path to the input file"
)
parser.add_argument(
"-i", "--input", dest="INPUT_PATH", help="the path to the input file"
)
parser.add_argument(
"-o",
"--output",
dest="OUTPUT_PATH",
default="output"
if str(INSTALL_DIR) == PROCESS_DIR or INSTALL_DIR.as_posix() == PROCESS_DIR
else ".",
help="the path to the output folder",
)
args = parser.parse_args()
INPUT_PATH = args.POSITIONAL_INPUT_PATH or args.INPUT_PATH
OUTPUT_PATH = (
args.OUTPUT_PATH
if os.path.isabs(args.OUTPUT_PATH)
else os.path.join(PROCESS_DIR, args.OUTPUT_PATH)
)
def strip_accents(text):
text = unicodedata.normalize("NFKD", text)
text = text.encode("ascii", "ignore")
text = text.decode("utf-8")
return str(text)
def split_channels(channel_layout):
if channel_layout == "quad":
subprocess.run(
[
"ffmpeg",
"-i",
INPUT_PATH,
"-filter_complex",
f"channelsplit=channel_layout={channel_layout}[FL][FR][SL][SR]",
"-map",
"[FL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [1 FL].wav"),
"-map",
"[FR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [2 FR].wav"),
"-map",
"[SL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [5 SL].wav"),
"-map",
"[SR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [6 SR].wav"),
"-y",
]
)
if channel_layout == "5.1":
subprocess.run(
[
"ffmpeg",
"-i",
INPUT_PATH,
"-filter_complex",
f"channelsplit=channel_layout={channel_layout}[FL][FR][FC][LFE][SL][SR]",
"-map",
"[FL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [1 FL].wav"),
"-map",
"[FR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [2 FR].wav"),
"-map",
"[FC]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [3 FC].wav"),
"-map",
"[LFE]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [4 LFE].wav"),
"-map",
"[SL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [5 SL].wav"),
"-map",
"[SR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [6 SR].wav"),
"-y",
]
)
if channel_layout == "7.1" and FILE_EXTENSION == ".wav":
subprocess.run(
[
"ffmpeg",
"-i",
INPUT_PATH,
"-filter_complex",
f"channelsplit=channel_layout={channel_layout}[FL][FR][FC][LFE][SL][SR][BL][BR]", # reverse SL / SR and BL / BR for wav
"-map",
"[FL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [1 FL].wav"),
"-map",
"[FR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [2 FR].wav"),
"-map",
"[FC]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [3 FC].wav"),
"-map",
"[LFE]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [4 LFE].wav"),
"-map",
"[SL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [5 SL].wav"),
"-map",
"[SR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [6 SR].wav"),
"-map",
"[BL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [7 BL].wav"),
"-map",
"[BR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [8 BR].wav"),
"-y",
]
)
if channel_layout == "7.1" and FILE_EXTENSION != ".wav":
subprocess.run(
[
"ffmpeg",
"-i",
INPUT_PATH,
"-filter_complex",
f"channelsplit=channel_layout={channel_layout}[FL][FR][FC][LFE][BL][BR][SL][SR]",
"-map",
"[FL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [1 FL].wav"),
"-map",
"[FR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [2 FR].wav"),
"-map",
"[FC]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [3 FC].wav"),
"-map",
"[LFE]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [4 LFE].wav"),
"-map",
"[SL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [5 SL].wav"),
"-map",
"[SR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [6 SR].wav"),
"-map",
"[BL]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [7 BL].wav"),
"-map",
"[BR]",
"-c:a",
CODEC,
os.path.join(OUTPUT_PATH, FILE_NAME, f"{FILE_NAME} [8 BR].wav"),
"-y",
]
)
def get_audio_channels_info():
try:
channels = int(
subprocess.check_output(
[
"ffprobe",
"-v",
"error",
"-select_streams",
"a",
"-show_entries",
"stream=channels",
"-of",
"default=noprint_wrappers=1:nokey=1",
INPUT_PATH,
]
)
)
channel_layout = subprocess.check_output(
[
"ffprobe",
"-v",
"error",
"-select_streams",
"a",
"-show_entries",
"stream=channel_layout",
"-of",
"default=noprint_wrappers=1:nokey=1",
INPUT_PATH,
]
).decode("UTF-8")
return (
channels,
"quad"
if "quad" in channel_layout
else "5.1"
if "5.1" in channel_layout
else "7.1"
if "7.1" in channel_layout
else "7.1"
if channels == 8 and FILE_EXTENSION == ".wav"
else None,
)
except subprocess.CalledProcessError as e:
print(f"Error running FFprobe: {e}")
return None, None
def get_codec():
print("Getting codec...")
if BIT_DEPTH == 16:
codec = "pcm_s16le"
elif BIT_DEPTH == 24:
codec = "pcm_s24le"
elif BIT_DEPTH == 32:
codec = "pcm_s32le"
else:
raise ValueError(f"Unsupported bit depth: {BIT_DEPTH}")
print(f"codec={codec}")
print("Done.")
return codec
def get_bit_depth():
print("Extracting bit depth...")
bit_depth = int(
subprocess.check_output(
[
"ffprobe",
"-v",
"error",
"-select_streams",
"a",
"-show_entries",
"stream=bits_per_raw_sample",
"-of",
"default=noprint_wrappers=1:nokey=1",
INPUT_PATH,
]
).split()[0]
)
print(f"bits_per_sample={bit_depth}")
print("Done.")
return bit_depth
def main():
global BASE_PATH, FILE_EXTENSION
BASE_PATH = os.path.basename(INPUT_PATH)
FILE_EXTENSION = os.path.splitext(BASE_PATH)[1]
global FILE_NAME, INPUT_DIR, FILE_PATH
FILE_NAME = strip_accents(BASE_PATH.removesuffix(FILE_EXTENSION))
channels, channel_layout = get_audio_channels_info()
if channels is not None and channel_layout is not None:
print(f"Number of channels: {channels}")
print(f"Channel layout: {channel_layout}")
if os.path.exists(os.path.join(OUTPUT_PATH, FILE_NAME)):
print("Working dir already exists.")
else:
os.mkdir(os.path.join(OUTPUT_PATH, FILE_NAME))
print("Working dir created.")
global BIT_DEPTH, CODEC
BIT_DEPTH = get_bit_depth()
CODEC = get_codec()
split_channels(channel_layout)
else:
if channels is not None and channels > 8:
print("Too many channels! You need to downmix to 7.1 :)")
else:
print("Failed to retrieve channel information.")
if __name__ == "__main__":
main()