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dshow.py
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192 lines (156 loc) · 5.5 KB
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""" DirectShow device"""
from subprocess import PIPE
from ffmpegio import path
import re
from pluggy import HookimplMarker
from packaging.version import Version
import logging
logger = logging.getLogger("ffmpegio")
hookimpl = HookimplMarker("ffmpegio")
def _scan():
logs = path.ffmpeg(
[
"-hide_banner",
"-f",
"dshow",
"-list_devices",
"true",
"-i",
"dummy",
"-loglevel",
"repeat+info",
],
stderr=PIPE,
universal_newlines=True,
).stderr
logger.debug(logs)
sign = re.match(r"\[(.+?)\]", logs)[1]
class TypeCounter:
def __init__(self) -> None:
self.v = 0
self.a = 0
def __call__(self, t, m):
if m[2] is not None:
t = m[2]
if t == "video":
id = f"v:{self.v}"
self.v += 1
else:
id = f"a:{self.a}"
self.a += 1
return id
get_id = TypeCounter()
get_info = lambda t, name, description: {
"media_type": t,
"name": name,
"description": description,
"is_default": None,
}
logger.debug("For <v5.0")
re_header = re.compile(
rf"\[{sign}\] (?:DirectShow (.+?) devices.*|Could not enumerate .+? devices.*)\n|dummy: Immediate exit requested"
)
groups = [(m[1], *m.span()) for m in re_header.finditer(logs)]
logger.debug(groups)
re_dev = re.compile(
rf'\[{sign}\] "(.+?)"(?: \((.+?)\))?\n\[{sign}\] Alternative name "(.+?)"'
)
return {
get_id(media_type, m): get_info(media_type, m[1], m[3])
for i, (media_type, _, stop) in enumerate(groups[:-1])
if media_type in ("audio", "video")
for m in re_dev.finditer(logs[stop : groups[i + 1][1]])
}
def _resolve(infos):
# TODO Verify if multiple videos/audios allowed (more than 1 each)
return ":".join([f'{dev["media_type"]}={dev["name"]}' for dev in infos])
def _list_options(dev):
ver = path.FFMPEG_VER
v5_or_later = ver.is_devrelease or ver >= Version("5.0")
is_video = dev["media_type"] == "video"
url = f'{dev["media_type"]}={dev["name"]}'
logs = path.ffmpeg(
[
"-hide_banner",
"-f",
"dshow",
"-list_options",
"true",
"-i",
url,
"-loglevel",
"repeat+info",
],
stderr=PIPE,
universal_newlines=True,
).stderr
# read header
m = re.match(rf"\[(.+?)\] DirectShow .+? device options \(from .+? devices\)", logs)
sign = re.escape(m[1])
i0 = m.end()
m = re.search(
rf"Error opening input: Immediate exit requested\n", logs
) or re.search(rf"{re.escape(url)}: Immediate exit requested\n", logs)
i1 = m.start() if m else len(logs)
re_pin = re.compile(rf'\[{sign}\] Pin "(.+?)" \(alternative pin name "(.+?)"\)\n')
re_video = re.compile(
rf"\[{sign}\] (?:unknown compression type 0x([0-9A-F]+?)|vcodec=(.+?)|pixel_format=(.+?))"
+ rf" min s=(\d+)x(\d+) fps=([\d.]+) max s=(\d+)x(\d+) fps=([\d.]+)"
+ rf"(?: \((.+?), (.+?)/(.+?)/(.+?)(?:, (.+?))?\))?\n"
)
re_audio = re.compile(
rf"\[{sign}\] ch=\s*(\d+), bits=\s*(\d+), rate=\s*(\d+)\n"
if v5_or_later
else rf"\[{sign}\] min ch=\s*(\d+) bits=\s*(\d+) rate=\s*(\d+) max ch=\s*(\d+) bits=\s*(\d+) rate=\s*(\d+)\n"
)
pins = [(m[1], *m.span()) for m in re_pin.finditer(logs)]
ipins = [(pin[2], pins[i + 1][1]) for i, pin in enumerate(pins[:-1])]
ipins.append((pins[-1][2], i1))
device_formats = []
for (pin, *_), (i0, i1) in zip(pins, ipins):
def form_video_config(m):
# https://docs.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-iamstreamconfig-getstreamcapss
cfg = {"vcodec": m[2]} if m[2] else {"pixel_format": m[3]} if m[3] else {}
cfg["video_pin_name"] = pin
cfg["width"] = int(m[4])
cfg["height"] = int(m[5])
cfg["video_size"] = f"{m[4]}x{m[5]}"
cfg["framerate"] = (float(m[6]), float(m[9]))
if m[10]:
if m[11]:
cfg["col_range"] = m[10]
cfg["col_space"] = m[11]
cfg["col_prim"] = m[12]
cfg["col_trc"] = m[13]
if m[14]:
cfg["chroma_loc"] = m[14]
else:
cfg["chroma_loc"] = m[10]
return cfg
def form_audio_config(m):
return (
{
"audio_pin_name": pin,
"channels": int(m[1]),
"sample_size": int(m[2]),
"sample_rate": int(m[3]),
}
if v5_or_later
else {
"audio_pin_name": pin,
"channels": (int(m[1]), int(m[4])),
"sample_size": (int(m[2]), int(m[5])),
"sample_rate": (int(m[3]), int(m[6])),
}
)
re_cfgs = re_video if is_video else re_audio
form_config = form_video_config if is_video else form_audio_config
device_formats.extend([form_config(m) for m in re_cfgs.finditer(logs[i0:i1])])
return device_formats
@hookimpl
def device_source_api():
return "dshow", {
"scan": _scan,
"resolve": _resolve,
"list_options": _list_options,
}