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import argparse
import os
import pathlib
import platform
import re
import shlex
import subprocess
import sys
from Cython.Build import cythonize
from Cython.Compiler.AutoDocTransforms import EmbedSignature
from setuptools import Extension, find_packages, setup
FFMPEG_LIBRARIES = [
"avformat",
"avcodec",
"avdevice",
"avutil",
"avfilter",
"swscale",
"swresample",
]
# Monkey-patch Cython to not overwrite embedded signatures.
old_embed_signature = EmbedSignature._embed_signature
def new_embed_signature(self, sig, doc):
# Strip any `self` parameters from the front.
sig = re.sub(r"\(self(,\s+)?", "(", sig)
# If they both start with the same signature; skip it.
if sig and doc:
new_name = sig.split("(")[0].strip()
old_name = doc.split("(")[0].strip()
if new_name == old_name:
return doc
if new_name.endswith("." + old_name):
return doc
return old_embed_signature(self, sig, doc)
EmbedSignature._embed_signature = new_embed_signature
def get_config_from_directory(ffmpeg_dir):
"""
Get distutils-compatible extension arguments for a specific directory.
"""
if not os.path.isdir(ffmpeg_dir):
print("The specified ffmpeg directory does not exist")
exit(1)
include_dir = os.path.join(FFMPEG_DIR, "include")
library_dir = os.path.join(FFMPEG_DIR, "lib")
if not os.path.exists(include_dir):
include_dir = FFMPEG_DIR
if not os.path.exists(library_dir):
library_dir = FFMPEG_DIR
return {
"include_dirs": [include_dir],
"libraries": FFMPEG_LIBRARIES,
"library_dirs": [library_dir],
}
def get_config_from_pkg_config():
"""
Get distutils-compatible extension arguments using pkg-config.
"""
pkg_config = os.environ.get("PKG_CONFIG", "pkg-config")
try:
raw_cflags = subprocess.check_output(
[pkg_config, "--cflags", "--libs"]
+ ["lib" + name for name in FFMPEG_LIBRARIES]
)
except FileNotFoundError:
print(f"{pkg_config} is required for building PyAV")
exit(1)
except subprocess.CalledProcessError:
print(f"{pkg_config} could not find libraries {FFMPEG_LIBRARIES}")
exit(1)
known, unknown = parse_cflags(raw_cflags.decode("utf-8"))
if unknown:
print("pkg-config returned flags we don't understand: {}".format(unknown))
if "-pthread" in unknown:
print("Building PyAV against static FFmpeg libraries is not supported.")
exit(1)
return known
def parse_cflags(raw_flags):
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("-I", dest="include_dirs", action="append")
parser.add_argument("-L", dest="library_dirs", action="append")
parser.add_argument("-l", dest="libraries", action="append")
parser.add_argument("-D", dest="define_macros", action="append")
parser.add_argument("-R", dest="runtime_library_dirs", action="append")
raw_args = shlex.split(raw_flags.strip())
args, unknown = parser.parse_known_args(raw_args)
config = {k: v or [] for k, v in args.__dict__.items()}
for i, x in enumerate(config["define_macros"]):
parts = x.split("=", 1)
value = x[1] or None if len(x) == 2 else None
config["define_macros"][i] = (parts[0], value)
return config, " ".join(shlex.quote(x) for x in unknown)
# Parse command-line arguments.
FFMPEG_DIR = None
for i, arg in enumerate(sys.argv):
if arg.startswith("--ffmpeg-dir="):
FFMPEG_DIR = arg.split("=")[1]
del sys.argv[i]
# Locate ffmpeg libraries and headers.
if FFMPEG_DIR is not None:
extension_extra = get_config_from_directory(FFMPEG_DIR)
elif platform.system() != "Windows":
extension_extra = get_config_from_pkg_config()
else:
extension_extra = {
"include_dirs": [],
"libraries": FFMPEG_LIBRARIES,
"library_dirs": [],
}
IMPORT_NAME = "av"
loudnorm_extension = Extension(
f"{IMPORT_NAME}.filter.loudnorm",
sources=[
f"{IMPORT_NAME}/filter/loudnorm.py",
f"{IMPORT_NAME}/filter/loudnorm_impl.c",
],
include_dirs=[f"{IMPORT_NAME}/filter"] + extension_extra["include_dirs"],
libraries=extension_extra["libraries"],
library_dirs=extension_extra["library_dirs"],
)
compiler_directives = {
"c_string_type": "str",
"c_string_encoding": "ascii",
"embedsignature": True,
"binding": False,
"language_level": 3,
"freethreading_compatible": True,
}
# Add the cythonized loudnorm extension to ext_modules
ext_modules = cythonize(
loudnorm_extension,
compiler_directives=compiler_directives,
build_dir="src",
include_path=["include"],
)
for dirname, dirnames, filenames in os.walk(IMPORT_NAME):
for filename in filenames:
# We are looking for Cython sources.
if filename.startswith("."):
continue
if filename in {"__init__.py", "__main__.py", "about.py", "datasets.py"}:
continue
if os.path.splitext(filename)[1] not in {".pyx", ".py"}:
continue
pyx_path = os.path.join(dirname, filename)
base = os.path.splitext(pyx_path)[0]
# Need to be a little careful because Windows will accept / or \
# (where os.sep will be \ on Windows).
mod_name = base.replace("/", ".").replace(os.sep, ".")
# Cythonize the module.
ext_modules += cythonize(
Extension(
mod_name,
include_dirs=extension_extra["include_dirs"],
libraries=extension_extra["libraries"],
library_dirs=extension_extra["library_dirs"],
sources=[pyx_path],
),
compiler_directives=compiler_directives,
build_dir="src",
include_path=["include"],
)
package_folders = pathlib.Path(IMPORT_NAME).glob("**/")
package_data = {
".".join(pckg.parts): ["*.pxd", "*.pyi", "*.typed"] for pckg in package_folders
}
setup(
packages=find_packages(include=[f"{IMPORT_NAME}*"]),
package_data=package_data,
ext_modules=ext_modules,
)
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