mirror of
https://github.com/maziggy/bambuddy.git
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maziggy
09d8e7d682
The snapshot endpoint always used the internal printer camera even when an external camera was configured. Now checks for external camera first, matching the stream endpoint pattern. Also added retry logic (3 attempts, 2s delay) to MJPEG and RTSP stream generators so they reconnect on timeout instead of silently ending the stream.
800 lines
27 KiB
Python
800 lines
27 KiB
Python
"""External camera service.
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Supports MJPEG streams, RTSP streams (via ffmpeg), HTTP snapshot URLs, and USB cameras.
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Security Note: This service intentionally makes requests to user-configured camera URLs.
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This is necessary functionality for external camera integration. URLs are validated
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to ensure they are well-formed before use.
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"""
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import asyncio
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import logging
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import re
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import shutil
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from collections.abc import AsyncGenerator
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from pathlib import Path
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from urllib.parse import urlparse
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import aiohttp
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logger = logging.getLogger(__name__)
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def _sanitize_camera_url(url: str, allowed_schemes: tuple[str, ...] = ("http", "https", "rtsp")) -> str | None:
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"""Validate and sanitize camera URL, returning a safe reconstructed URL.
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This validates that the URL is well-formed, uses an allowed scheme,
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does not target cloud metadata services, and returns a reconstructed
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URL from validated components.
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Note: This intentionally allows user-provided URLs as that is the
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purpose of external camera configuration. Local network IPs are
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allowed since cameras are typically on the same LAN.
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Args:
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url: URL to validate and sanitize
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allowed_schemes: Tuple of allowed URL schemes
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Returns:
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Sanitized URL string if valid, None otherwise
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"""
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try:
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parsed = urlparse(url)
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if not parsed.scheme or not parsed.netloc:
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return None
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# Validate scheme against allowlist
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scheme = parsed.scheme.lower()
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if scheme not in allowed_schemes:
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return None
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# Block cloud metadata service endpoints (SSRF mitigation)
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# These are dangerous destinations that should never be accessed
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hostname = parsed.hostname or ""
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hostname_lower = hostname.lower()
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blocked_hosts = (
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"169.254.169.254", # AWS/GCP/Azure metadata
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"metadata.google.internal", # GCP metadata
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"metadata.google",
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"localhost", # Block localhost to prevent internal service access
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"127.0.0.1",
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"::1",
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"0.0.0.0", # nosec B104
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)
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if hostname_lower in blocked_hosts:
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logger.warning("Blocked camera URL targeting restricted host: %s", hostname)
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return None
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# Block link-local addresses (169.254.x.x)
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if hostname.startswith("169.254."):
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logger.warning("Blocked camera URL targeting link-local address: %s", hostname)
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return None
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# Reconstruct URL from validated components to break taint chain
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# This creates a new string from validated parts
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port_str = f":{parsed.port}" if parsed.port else ""
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path = parsed.path or ""
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query = f"?{parsed.query}" if parsed.query else ""
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fragment = f"#{parsed.fragment}" if parsed.fragment else ""
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# Build sanitized URL from validated components
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sanitized = f"{scheme}://{hostname}{port_str}{path}{query}{fragment}"
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return sanitized
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except ValueError:
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return None
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def _validate_camera_url(url: str, allowed_schemes: tuple[str, ...] = ("http", "https", "rtsp")) -> bool:
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"""Validate camera URL format (legacy wrapper).
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Args:
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url: URL to validate
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allowed_schemes: Tuple of allowed URL schemes
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Returns:
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True if URL is valid, False otherwise
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"""
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return _sanitize_camera_url(url, allowed_schemes) is not None
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def list_usb_cameras() -> list[dict]:
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"""List available USB cameras (V4L2 devices on Linux).
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Returns:
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List of dicts with {device: str, name: str, capabilities: list}
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"""
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cameras = []
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video_devices = sorted(Path("/dev").glob("video*"))
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for device in video_devices:
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device_path = str(device)
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info = {"device": device_path, "name": device.name, "capabilities": []}
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# Try to get device info via v4l2-ctl
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v4l2_ctl = shutil.which("v4l2-ctl")
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if v4l2_ctl:
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import subprocess
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try:
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result = subprocess.run(
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[v4l2_ctl, "-d", device_path, "--info"],
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capture_output=True,
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text=True,
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timeout=5,
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)
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if result.returncode == 0:
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# Parse device name from output
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for line in result.stdout.splitlines():
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if "Card type" in line:
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info["name"] = line.split(":", 1)[1].strip()
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elif "Driver name" in line:
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info["driver"] = line.split(":", 1)[1].strip()
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# Check if device supports video capture
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result = subprocess.run(
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[v4l2_ctl, "-d", device_path, "--list-formats"],
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capture_output=True,
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text=True,
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timeout=5,
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)
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if result.returncode == 0 and result.stdout.strip():
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info["capabilities"].append("capture")
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# Parse available formats
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formats = re.findall(r"'(\w+)'", result.stdout)
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info["formats"] = list(set(formats))
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except (subprocess.TimeoutExpired, Exception) as e:
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logger.debug("v4l2-ctl failed for %s: %s", device_path, e)
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# Only include devices that look like video capture devices
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# Skip metadata devices (typically odd numbered like video1, video3)
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try:
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device_num = int(device.name.replace("video", ""))
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# Even numbered devices are usually capture, odd are metadata
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# But also check if we got capabilities
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if info.get("capabilities") or device_num % 2 == 0:
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cameras.append(info)
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except ValueError:
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cameras.append(info)
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return cameras
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def get_ffmpeg_path() -> str | None:
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"""Get the path to ffmpeg executable."""
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# Try shutil.which first
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path = shutil.which("ffmpeg")
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if path:
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return path
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# Check common locations (systemd services may have limited PATH)
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for common_path in ["/usr/bin/ffmpeg", "/usr/local/bin/ffmpeg", "/opt/homebrew/bin/ffmpeg"]:
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if Path(common_path).exists():
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return common_path
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return None
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async def capture_frame(url: str, camera_type: str, timeout: int = 15) -> bytes | None:
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"""Capture single frame from external camera.
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Args:
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url: Camera URL (MJPEG stream, RTSP URL, HTTP snapshot URL, or USB device path)
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camera_type: "mjpeg", "rtsp", "snapshot", or "usb"
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timeout: Connection timeout in seconds
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Returns:
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JPEG bytes or None on failure
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"""
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logger.debug("capture_frame called: type=%s, url=%s...", camera_type, url[:50] if url else "None")
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if camera_type == "mjpeg":
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return await _capture_mjpeg_frame(url, timeout)
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elif camera_type == "rtsp":
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return await _capture_rtsp_frame(url, timeout)
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elif camera_type == "snapshot":
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return await _capture_snapshot(url, timeout)
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elif camera_type == "usb":
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return await _capture_usb_frame(url, timeout)
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else:
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logger.warning("Unknown camera type: %s", camera_type)
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return None
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async def _capture_usb_frame(device: str, timeout: int) -> bytes | None:
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"""Capture frame from USB camera using ffmpeg."""
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ffmpeg = get_ffmpeg_path()
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if not ffmpeg:
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logger.error("ffmpeg not found - required for USB camera capture")
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return None
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# Validate device path - must be /dev/videoN format where N is 0-99
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# This prevents path traversal by using a strict allowlist approach
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import re as regex_module
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device_match = regex_module.match(r"^/dev/video(\d{1,2})$", device)
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if not device_match:
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logger.error("Invalid USB device path format: %s", device)
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return None
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# Convert to integer to break taint chain - integers cannot contain path traversal
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# lgtm[py/path-injection] - device_num is validated integer 0-99
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device_num = int(device_match.group(1)) # Safe: regex guarantees 1-2 digits
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if device_num > 99:
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logger.error("USB device number out of range: %s", device_num)
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return None
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# Construct safe path from validated integer (completely untainted)
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safe_device_path = Path(f"/dev/video{device_num}") # lgtm[py/path-injection]
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if not safe_device_path.exists():
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logger.error("USB device does not exist: %s", safe_device_path)
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return None
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# Use the safe path for ffmpeg - this is a hardcoded /dev/videoN path
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device = str(safe_device_path) # lgtm[py/path-injection]
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# Use ffmpeg to grab a single frame from USB camera
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cmd = [
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ffmpeg,
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"-f",
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"v4l2",
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"-i",
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device,
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"-frames:v",
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"1",
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"-f",
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"image2pipe",
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"-vcodec",
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"mjpeg",
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"-q:v",
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"2",
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"-",
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]
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try:
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logger.debug("Running USB capture: %s", " ".join(cmd))
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process = await asyncio.create_subprocess_exec(
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*cmd,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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)
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stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=timeout)
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if process.returncode != 0:
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logger.error("ffmpeg USB capture failed: %s", stderr.decode()[:200])
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return None
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if not stdout or len(stdout) < 100:
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logger.error("ffmpeg returned empty or too small frame from USB camera")
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return None
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return stdout
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except TimeoutError:
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logger.warning("USB frame capture timed out after %ss", timeout)
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if process:
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process.kill()
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return None
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except OSError as e:
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logger.error("USB frame capture failed: %s", e)
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return None
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async def _capture_mjpeg_frame(url: str, timeout: int) -> bytes | None:
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"""Extract single frame from MJPEG stream.
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Note: This function intentionally makes requests to user-configured URLs.
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External camera support requires connecting to user-specified camera endpoints.
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URL is sanitized and dangerous destinations are blocked.
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"""
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# Sanitize URL - returns reconstructed URL from validated components
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safe_url = _sanitize_camera_url(url, ("http", "https"))
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if not safe_url:
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logger.error("Invalid MJPEG URL format: %s...", url[:50])
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return None
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try:
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async with (
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aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=timeout)) as session,
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session.get(safe_url) as response,
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):
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if response.status != 200:
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logger.error("MJPEG stream returned status %s", response.status)
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return None
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# Read chunks until we find a complete JPEG frame
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buffer = b""
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jpeg_start = b"\xff\xd8"
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jpeg_end = b"\xff\xd9"
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async for chunk in response.content.iter_chunked(8192):
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buffer += chunk
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# Look for complete JPEG frame
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start_idx = buffer.find(jpeg_start)
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if start_idx == -1:
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continue
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end_idx = buffer.find(jpeg_end, start_idx + 2)
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if end_idx != -1:
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# Found complete frame
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frame = buffer[start_idx : end_idx + 2]
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return frame
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# Keep searching, but limit buffer size
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if len(buffer) > 5 * 1024 * 1024: # 5MB limit
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logger.warning("MJPEG buffer exceeded 5MB without finding frame")
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return None
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except TimeoutError:
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logger.warning("MJPEG frame capture timed out after %ss", timeout)
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return None
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except (aiohttp.ClientError, OSError) as e:
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logger.error("MJPEG frame capture failed: %s", e)
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return None
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return None
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async def _capture_rtsp_frame(url: str, timeout: int) -> bytes | None:
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"""Capture frame from RTSP using ffmpeg."""
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ffmpeg = get_ffmpeg_path()
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if not ffmpeg:
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logger.error("ffmpeg not found - required for RTSP capture")
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return None
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# Use ffmpeg to grab a single frame from RTSP stream
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# ffmpeg handles both rtsp:// and rtsps:// URLs automatically
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cmd = [
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ffmpeg,
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"-rtsp_transport",
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"tcp",
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"-i",
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url,
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"-frames:v",
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"1",
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"-f",
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"image2pipe",
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"-vcodec",
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"mjpeg",
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"-q:v",
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"2",
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"-",
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]
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try:
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logger.debug(f"Running ffmpeg command: {' '.join(cmd[:6])}...")
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process = await asyncio.create_subprocess_exec(
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*cmd,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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)
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stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=timeout)
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logger.debug(
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f"ffmpeg returned: code={process.returncode}, stdout={len(stdout)} bytes, stderr={len(stderr)} bytes"
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)
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if process.returncode != 0:
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logger.error("ffmpeg RTSP capture failed: %s", stderr.decode()[:200])
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return None
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if not stdout or len(stdout) < 100:
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logger.error("ffmpeg returned empty or too small frame")
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return None
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return stdout
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except TimeoutError:
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logger.warning("RTSP frame capture timed out after %ss", timeout)
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if process:
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process.kill()
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return None
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except OSError as e:
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logger.error("RTSP frame capture failed: %s", e)
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return None
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async def _capture_snapshot(url: str, timeout: int) -> bytes | None:
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"""Fetch snapshot from HTTP URL.
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Note: This function intentionally makes requests to user-configured URLs.
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External camera support requires connecting to user-specified camera endpoints.
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URL is sanitized and dangerous destinations are blocked.
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"""
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# Sanitize URL - returns reconstructed URL from validated components
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safe_url = _sanitize_camera_url(url, ("http", "https"))
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if not safe_url:
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logger.error("Invalid snapshot URL format: %s...", url[:50])
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return None
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try:
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async with (
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aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=timeout)) as session,
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session.get(safe_url) as response,
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):
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if response.status != 200:
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logger.error("Snapshot URL returned status %s", response.status)
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return None
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data = await response.read()
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# Validate it looks like JPEG
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if not data.startswith(b"\xff\xd8"):
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logger.warning("Snapshot does not appear to be JPEG")
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# Still return it - might be valid with different header
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return data
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except TimeoutError:
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logger.warning("Snapshot capture timed out after %ss", timeout)
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return None
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except (aiohttp.ClientError, OSError) as e:
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logger.error("Snapshot capture failed: %s", e)
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return None
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async def test_connection(url: str, camera_type: str) -> dict:
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"""Test camera connection.
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Returns:
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Dict with {success: bool, error?: str, resolution?: str}
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"""
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logger.info("Testing camera connection: type=%s, url=%s...", camera_type, url[:50])
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try:
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frame = await capture_frame(url, camera_type, timeout=10)
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logger.info("Capture result: %s bytes", len(frame) if frame else 0)
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if frame:
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# Try to get resolution from JPEG header
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resolution = None
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try:
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# Simple JPEG dimension extraction
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# SOF0 marker is FF C0, followed by length, precision, height, width
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sof_markers = [b"\xff\xc0", b"\xff\xc1", b"\xff\xc2"]
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for marker in sof_markers:
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idx = frame.find(marker)
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if idx != -1 and idx + 9 <= len(frame):
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height = (frame[idx + 5] << 8) | frame[idx + 6]
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width = (frame[idx + 7] << 8) | frame[idx + 8]
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resolution = f"{width}x{height}"
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break
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except (IndexError, ValueError):
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pass # Resolution detection is optional; fall back to default
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return {"success": True, "resolution": resolution}
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else:
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return {"success": False, "error": "Failed to capture frame from camera"}
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except Exception as e:
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# Sanitize error message - don't expose internal details
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error_type = type(e).__name__
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logger.error("Camera connection test failed: %s", e)
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return {"success": False, "error": f"Connection failed: {error_type}"}
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async def generate_mjpeg_stream(url: str, camera_type: str, fps: int = 10) -> AsyncGenerator[bytes, None]:
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"""Generator yielding MJPEG frames for streaming.
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Args:
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url: Camera URL or USB device path
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camera_type: "mjpeg", "rtsp", "snapshot", or "usb"
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fps: Target frames per second
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Yields:
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MJPEG frame data with HTTP multipart boundaries
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"""
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frame_interval = 1.0 / max(fps, 1)
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last_frame_time = 0.0
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if camera_type == "mjpeg":
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# Proxy MJPEG stream directly, with reconnect on timeout
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max_retries = 3
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for attempt in range(max_retries + 1):
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frame_yielded = False
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async for frame in _stream_mjpeg(url):
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frame_yielded = True
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current_time = asyncio.get_event_loop().time()
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if current_time - last_frame_time >= frame_interval:
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last_frame_time = current_time
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yield _format_mjpeg_frame(frame)
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if not frame_yielded or attempt == max_retries:
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break
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logger.warning(
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"External MJPEG stream ended, reconnecting (attempt %d/%d)...",
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attempt + 1,
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max_retries,
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)
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await asyncio.sleep(2)
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elif camera_type == "rtsp":
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# Use ffmpeg to convert RTSP to MJPEG, with reconnect on timeout
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max_retries = 3
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for attempt in range(max_retries + 1):
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frame_yielded = False
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async for frame in _stream_rtsp(url, fps):
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frame_yielded = True
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yield _format_mjpeg_frame(frame)
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|
if not frame_yielded or attempt == max_retries:
|
|
break
|
|
logger.warning(
|
|
"External RTSP stream ended, reconnecting (attempt %d/%d)...",
|
|
attempt + 1,
|
|
max_retries,
|
|
)
|
|
await asyncio.sleep(2)
|
|
|
|
elif camera_type == "usb":
|
|
# Use ffmpeg to stream from USB camera
|
|
async for frame in _stream_usb(url, fps):
|
|
yield _format_mjpeg_frame(frame)
|
|
|
|
elif camera_type == "snapshot":
|
|
# Poll snapshot URL at interval
|
|
while True:
|
|
try:
|
|
frame = await _capture_snapshot(url, timeout=10)
|
|
if frame:
|
|
yield _format_mjpeg_frame(frame)
|
|
await asyncio.sleep(frame_interval)
|
|
except asyncio.CancelledError:
|
|
break
|
|
except (aiohttp.ClientError, OSError) as e:
|
|
logger.warning("Snapshot poll failed: %s", e)
|
|
await asyncio.sleep(frame_interval)
|
|
|
|
|
|
def _format_mjpeg_frame(frame: bytes) -> bytes:
|
|
"""Format frame for MJPEG HTTP response."""
|
|
return (
|
|
b"--frame\r\n"
|
|
b"Content-Type: image/jpeg\r\n"
|
|
b"Content-Length: " + str(len(frame)).encode() + b"\r\n"
|
|
b"\r\n" + frame + b"\r\n"
|
|
)
|
|
|
|
|
|
async def _stream_mjpeg(url: str) -> AsyncGenerator[bytes, None]:
|
|
"""Stream frames from MJPEG URL.
|
|
|
|
Note: This function intentionally makes requests to user-configured URLs.
|
|
External camera support requires connecting to user-specified camera endpoints.
|
|
URL is sanitized and dangerous destinations are blocked.
|
|
"""
|
|
# Sanitize URL - returns reconstructed URL from validated components
|
|
safe_url = _sanitize_camera_url(url, ("http", "https"))
|
|
if not safe_url:
|
|
logger.error("Invalid MJPEG stream URL: %s...", url[:50])
|
|
return
|
|
|
|
try:
|
|
timeout = aiohttp.ClientTimeout(total=None, sock_read=30)
|
|
async with aiohttp.ClientSession(timeout=timeout) as session, session.get(safe_url) as response:
|
|
if response.status != 200:
|
|
logger.error("MJPEG stream returned status %s", response.status)
|
|
return
|
|
|
|
buffer = b""
|
|
jpeg_start = b"\xff\xd8"
|
|
jpeg_end = b"\xff\xd9"
|
|
|
|
async for chunk in response.content.iter_chunked(8192):
|
|
buffer += chunk
|
|
|
|
# Extract complete frames from buffer
|
|
while True:
|
|
start_idx = buffer.find(jpeg_start)
|
|
if start_idx == -1:
|
|
buffer = buffer[-2:] if len(buffer) > 2 else buffer
|
|
break
|
|
|
|
if start_idx > 0:
|
|
buffer = buffer[start_idx:]
|
|
|
|
end_idx = buffer.find(jpeg_end, 2)
|
|
if end_idx == -1:
|
|
break
|
|
|
|
frame = buffer[: end_idx + 2]
|
|
buffer = buffer[end_idx + 2 :]
|
|
yield frame
|
|
|
|
except asyncio.CancelledError:
|
|
logger.info("MJPEG stream cancelled")
|
|
except (aiohttp.ClientError, OSError) as e:
|
|
logger.error("MJPEG stream error: %s", e)
|
|
|
|
|
|
async def _stream_rtsp(url: str, fps: int) -> AsyncGenerator[bytes, None]:
|
|
"""Stream frames from RTSP URL via ffmpeg."""
|
|
ffmpeg = get_ffmpeg_path()
|
|
if not ffmpeg:
|
|
logger.error("ffmpeg not found - required for RTSP streaming")
|
|
return
|
|
|
|
# ffmpeg handles both rtsp:// and rtsps:// URLs automatically
|
|
cmd = [
|
|
ffmpeg,
|
|
"-rtsp_transport",
|
|
"tcp",
|
|
"-rtsp_flags",
|
|
"prefer_tcp",
|
|
"-timeout",
|
|
"30000000",
|
|
"-buffer_size",
|
|
"1024000",
|
|
"-max_delay",
|
|
"500000",
|
|
"-i",
|
|
url,
|
|
"-f",
|
|
"mjpeg",
|
|
"-q:v",
|
|
"5",
|
|
"-r",
|
|
str(fps),
|
|
"-an",
|
|
"-",
|
|
]
|
|
|
|
process = None
|
|
try:
|
|
process = await asyncio.create_subprocess_exec(
|
|
*cmd,
|
|
stdout=asyncio.subprocess.PIPE,
|
|
stderr=asyncio.subprocess.PIPE,
|
|
)
|
|
|
|
# Give ffmpeg a moment to start and check for immediate failures
|
|
await asyncio.sleep(0.5)
|
|
if process.returncode is not None:
|
|
stderr = await process.stderr.read()
|
|
logger.error("ffmpeg RTSP stream failed immediately: %s", stderr.decode()[:300])
|
|
return
|
|
|
|
buffer = b""
|
|
jpeg_start = b"\xff\xd8"
|
|
jpeg_end = b"\xff\xd9"
|
|
|
|
while True:
|
|
try:
|
|
chunk = await asyncio.wait_for(process.stdout.read(8192), timeout=30.0)
|
|
|
|
if not chunk:
|
|
break
|
|
|
|
buffer += chunk
|
|
|
|
# Extract complete frames
|
|
while True:
|
|
start_idx = buffer.find(jpeg_start)
|
|
if start_idx == -1:
|
|
buffer = buffer[-2:] if len(buffer) > 2 else buffer
|
|
break
|
|
|
|
if start_idx > 0:
|
|
buffer = buffer[start_idx:]
|
|
|
|
end_idx = buffer.find(jpeg_end, 2)
|
|
if end_idx == -1:
|
|
break
|
|
|
|
frame = buffer[: end_idx + 2]
|
|
buffer = buffer[end_idx + 2 :]
|
|
yield frame
|
|
|
|
except TimeoutError:
|
|
logger.warning("RTSP stream read timeout")
|
|
break
|
|
|
|
except asyncio.CancelledError:
|
|
logger.info("RTSP stream cancelled")
|
|
except OSError as e:
|
|
logger.error("RTSP stream error: %s", e)
|
|
finally:
|
|
if process and process.returncode is None:
|
|
process.terminate()
|
|
try:
|
|
await asyncio.wait_for(process.wait(), timeout=2.0)
|
|
except TimeoutError:
|
|
process.kill()
|
|
await process.wait()
|
|
|
|
|
|
async def _stream_usb(device: str, fps: int) -> AsyncGenerator[bytes, None]:
|
|
"""Stream frames from USB camera via ffmpeg."""
|
|
ffmpeg = get_ffmpeg_path()
|
|
if not ffmpeg:
|
|
logger.error("ffmpeg not found - required for USB camera streaming")
|
|
return
|
|
|
|
# Validate device path
|
|
if not device.startswith("/dev/video"):
|
|
logger.error("Invalid USB device path: %s", device)
|
|
return
|
|
|
|
if not Path(device).exists():
|
|
logger.error("USB device does not exist: %s", device)
|
|
return
|
|
|
|
# ffmpeg command to stream from USB camera (v4l2)
|
|
cmd = [
|
|
ffmpeg,
|
|
"-f",
|
|
"v4l2",
|
|
"-framerate",
|
|
str(fps),
|
|
"-i",
|
|
device,
|
|
"-f",
|
|
"mjpeg",
|
|
"-q:v",
|
|
"5",
|
|
"-r",
|
|
str(fps),
|
|
"-",
|
|
]
|
|
|
|
process = None
|
|
try:
|
|
logger.info("Starting USB camera stream from %s at %s fps", device, fps)
|
|
process = await asyncio.create_subprocess_exec(
|
|
*cmd,
|
|
stdout=asyncio.subprocess.PIPE,
|
|
stderr=asyncio.subprocess.PIPE,
|
|
)
|
|
|
|
# Give ffmpeg a moment to start and check for immediate failures
|
|
await asyncio.sleep(0.5)
|
|
if process.returncode is not None:
|
|
stderr = await process.stderr.read()
|
|
logger.error("ffmpeg USB stream failed immediately: %s", stderr.decode()[:300])
|
|
return
|
|
|
|
buffer = b""
|
|
jpeg_start = b"\xff\xd8"
|
|
jpeg_end = b"\xff\xd9"
|
|
|
|
while True:
|
|
try:
|
|
chunk = await asyncio.wait_for(process.stdout.read(8192), timeout=30.0)
|
|
|
|
if not chunk:
|
|
break
|
|
|
|
buffer += chunk
|
|
|
|
# Extract complete frames
|
|
while True:
|
|
start_idx = buffer.find(jpeg_start)
|
|
if start_idx == -1:
|
|
buffer = buffer[-2:] if len(buffer) > 2 else buffer
|
|
break
|
|
|
|
if start_idx > 0:
|
|
buffer = buffer[start_idx:]
|
|
|
|
end_idx = buffer.find(jpeg_end, 2)
|
|
if end_idx == -1:
|
|
break
|
|
|
|
frame = buffer[: end_idx + 2]
|
|
buffer = buffer[end_idx + 2 :]
|
|
yield frame
|
|
|
|
except TimeoutError:
|
|
logger.warning("USB stream read timeout")
|
|
break
|
|
|
|
except asyncio.CancelledError:
|
|
logger.info("USB stream cancelled")
|
|
except OSError as e:
|
|
logger.error("USB stream error: %s", e)
|
|
finally:
|
|
if process and process.returncode is None:
|
|
process.terminate()
|
|
try:
|
|
await asyncio.wait_for(process.wait(), timeout=2.0)
|
|
except TimeoutError:
|
|
process.kill()
|
|
await process.wait()
|