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#!/usr/bin/env python3
# © Copyright 2021-2022, Scott Gasch
"""Utilities for dealing with webcam images."""
import logging
import platform
import subprocess
import warnings
from dataclasses import dataclass
from typing import Optional
import cv2 # type: ignore
import numpy as np
import requests
import decorator_utils
import exceptions
import scott_secrets
logger = logging.getLogger(__name__)
@dataclass
class RawJpgHsv:
"""Raw image bytes, the jpeg image and the HSV (hue saturation value) image."""
raw: Optional[bytes] = None
jpg: Optional[np.ndarray] = None
hsv: Optional[np.ndarray] = None
@dataclass
class SanityCheckImageMetadata:
"""Is a Blue Iris image bad (big grey borders around it) or infrared?"""
is_infrared_image: bool = False
is_bad_image: bool = False
def sanity_check_image(hsv: np.ndarray) -> SanityCheckImageMetadata:
"""See if a Blue Iris or Shinobi image is bad and infrared."""
def is_near(a, b) -> bool:
return abs(a - b) < 3
rows, cols, _ = hsv.shape
num_pixels = rows * cols
weird_orange_count = 0
hs_zero_count = 0
for r in range(rows):
for c in range(cols):
pixel = hsv[(r, c)]
if is_near(pixel[0], 16) and is_near(pixel[1], 117) and is_near(pixel[2], 196):
weird_orange_count += 1
elif is_near(pixel[0], 0) and is_near(pixel[1], 0):
hs_zero_count += 1
logger.debug("hszero#=%d, weird_orange=%d", hs_zero_count, weird_orange_count)
return SanityCheckImageMetadata(
hs_zero_count > (num_pixels * 0.75),
weird_orange_count > (num_pixels * 0.75),
)
@decorator_utils.retry_if_none(tries=2, delay_sec=1, backoff=1.1)
def fetch_camera_image_from_video_server(
camera_name: str, *, width: int = 256, quality: int = 70
) -> Optional[bytes]:
"""Fetch the raw webcam image from the video server."""
camera_name = camera_name.replace(".house", "")
camera_name = camera_name.replace(".cabin", "")
url = f"http://10.0.0.226:8080/{scott_secrets.SHINOBI_KEY1}/jpeg/{scott_secrets.SHINOBI_KEY2}/{camera_name}/s.jpg"
logger.debug('Fetching image from %s', url)
try:
response = requests.get(url, stream=False, timeout=10.0)
if response.ok:
raw = response.content
logger.debug('Read %d byte image from HTTP server', len(response.content))
tmp = np.frombuffer(raw, dtype="uint8")
logger.debug(
'Translated raw content into %s %s with element type %s',
tmp.shape,
type(tmp),
type(tmp[0]),
)
jpg = cv2.imdecode(tmp, cv2.IMREAD_COLOR)
logger.debug(
'Decoded into %s jpeg %s with element type %s',
jpg.shape,
type(jpg),
type(jpg[0][0]),
)
hsv = cv2.cvtColor(jpg, cv2.COLOR_BGR2HSV)
logger.debug(
'Converted JPG into %s HSV HSV %s with element type %s',
hsv.shape,
type(hsv),
type(hsv[0][0]),
)
ret = sanity_check_image(hsv)
if not ret.is_bad_image:
return raw
except Exception as e:
logger.exception(e)
msg = f"Got a bad image or HTTP error from {url}; returning None."
logger.warning(msg)
warnings.warn(msg, stacklevel=2)
return None
def camera_name_to_hostname(camera_name: str) -> str:
"""Map a camera name to a hostname
>>> camera_name_to_hostname('driveway')
'driveway.house'
>>> camera_name_to_hostname('cabin_driveway')
'driveway.cabin'
"""
mapping = {
"driveway": "driveway.house",
"backyard": "backyard.house",
"frontdoor": "frontdoor.house",
"cabin_driveway": "driveway.cabin",
}
camera_name = mapping.get(camera_name, camera_name)
if "." not in camera_name:
hostname = platform.node()
suffix = hostname.split(".")[-1]
camera_name += f".{suffix}"
return camera_name
@decorator_utils.retry_if_none(tries=2, delay_sec=1, backoff=1.1)
def fetch_camera_image_from_rtsp_stream(camera_name: str, *, width: int = 256) -> Optional[bytes]:
"""Fetch the raw webcam image straight from the webcam's RTSP stream."""
hostname = camera_name_to_hostname(camera_name)
stream = f"rtsp://camera:{scott_secrets.CAMERA_PASSWORD}@{hostname}:554/live"
logger.debug('Fetching image from RTSP stream %s', stream)
try:
cmd = [
"/usr/bin/timeout",
"-k 9s",
"8s",
"/usr/local/bin/ffmpeg",
"-y",
"-i",
f"{stream}",
"-f",
"singlejpeg",
"-vframes",
"1",
"-vf",
f"scale={width}:-1",
"-",
]
with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL) as proc:
out, _ = proc.communicate(timeout=10)
return out
except Exception as e:
logger.exception(e)
msg = f"Failed to retrieve image via RTSP {stream}, returning None."
logger.warning(msg)
warnings.warn(msg, stacklevel=2)
return None
@decorator_utils.timeout(seconds=30, use_signals=False)
def _fetch_camera_image(camera_name: str, *, width: int = 256, quality: int = 70) -> RawJpgHsv:
"""Fetch a webcam image given the camera name."""
logger.debug("Trying to fetch camera image from video server")
raw = fetch_camera_image_from_video_server(camera_name, width=width, quality=quality)
if raw is None:
logger.debug("Reading from video server failed; trying direct RTSP stream")
raw = fetch_camera_image_from_rtsp_stream(camera_name, width=width)
if raw is not None and len(raw) > 0:
tmp = np.frombuffer(raw, dtype="uint8")
jpg = cv2.imdecode(tmp, cv2.IMREAD_COLOR)
hsv = cv2.cvtColor(jpg, cv2.COLOR_BGR2HSV)
return RawJpgHsv(
raw=raw,
jpg=jpg,
hsv=hsv,
)
msg = "Failed to retieve image from both video server and direct RTSP stream"
logger.warning(msg)
warnings.warn(msg, stacklevel=2)
return RawJpgHsv(None, None, None)
def fetch_camera_image(camera_name: str, *, width: int = 256, quality: int = 70) -> RawJpgHsv:
try:
return _fetch_camera_image(camera_name, width=width, quality=quality)
except exceptions.TimeoutError:
logger.warning('Fetching camera image operation timed out.')
return RawJpgHsv(None, None, None)
if __name__ == '__main__':
import doctest
doctest.testmod()
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