blakeblackshear.frigate/frigate/output.py
2021-06-13 12:35:39 -05:00

453 lines
15 KiB
Python

import datetime
import glob
import logging
import math
import multiprocessing as mp
import queue
import signal
import subprocess as sp
import threading
from multiprocessing import shared_memory
from wsgiref.simple_server import make_server
import cv2
import numpy as np
from setproctitle import setproctitle
from ws4py.server.wsgirefserver import (
WebSocketWSGIHandler,
WebSocketWSGIRequestHandler,
WSGIServer,
)
from ws4py.server.wsgiutils import WebSocketWSGIApplication
from ws4py.websocket import WebSocket
from frigate.config import FrigateConfig
from frigate.util import SharedMemoryFrameManager, copy_yuv_to_position, get_yuv_crop
logger = logging.getLogger(__name__)
class FFMpegConverter:
def __init__(self, in_width, in_height, out_width, out_height, quality):
ffmpeg_cmd = f"ffmpeg -f rawvideo -pix_fmt yuv420p -video_size {in_width}x{in_height} -i pipe: -f mpegts -s {out_width}x{out_height} -codec:v mpeg1video -q {quality} -bf 0 pipe:".split(
" "
)
self.process = sp.Popen(
ffmpeg_cmd,
stdout=sp.PIPE,
stderr=sp.DEVNULL,
stdin=sp.PIPE,
start_new_session=True,
)
def write(self, b):
self.process.stdin.write(b)
def read(self, length):
try:
return self.process.stdout.read1(length)
except ValueError:
return False
def exit(self):
self.process.terminate()
try:
self.process.communicate(timeout=30)
except sp.TimeoutExpired:
self.process.kill()
self.process.communicate()
class BroadcastThread(threading.Thread):
def __init__(self, camera, converter, websocket_server):
super(BroadcastThread, self).__init__()
self.camera = camera
self.converter = converter
self.websocket_server = websocket_server
def run(self):
while True:
buf = self.converter.read(65536)
if buf:
manager = self.websocket_server.manager
with manager.lock:
websockets = manager.websockets.copy()
ws_iter = iter(websockets.values())
for ws in ws_iter:
if not ws.terminated and ws.environ["PATH_INFO"].endswith(
self.camera
):
try:
ws.send(buf, binary=True)
except:
pass
elif self.converter.process.poll() is not None:
break
class BirdsEyeFrameManager:
def __init__(self, config, frame_manager: SharedMemoryFrameManager):
self.config = config
self.mode = config.birdseye.mode
self.frame_manager = frame_manager
width = config.birdseye.width
height = config.birdseye.height
self.frame_shape = (height, width)
self.yuv_shape = (height * 3 // 2, width)
self.frame = np.ndarray(self.yuv_shape, dtype=np.uint8)
# initialize the frame as black and with the frigate logo
self.blank_frame = np.zeros(self.yuv_shape, np.uint8)
self.blank_frame[:] = 128
self.blank_frame[0 : self.frame_shape[0], 0 : self.frame_shape[1]] = 16
# find and copy the logo on the blank frame
logo_files = glob.glob("/opt/frigate/web/apple-touch-icon.*.png")
frigate_logo = None
if len(logo_files) > 0:
frigate_logo = cv2.imread(logo_files[0], cv2.IMREAD_UNCHANGED)
if not frigate_logo is None:
transparent_layer = frigate_logo[:, :, 3]
y_offset = height // 2 - transparent_layer.shape[0] // 2
x_offset = width // 2 - transparent_layer.shape[1] // 2
self.blank_frame[
y_offset : y_offset + transparent_layer.shape[1],
x_offset : x_offset + transparent_layer.shape[0],
] = transparent_layer
else:
logger.warning("Unable to read frigate logo")
self.frame[:] = self.blank_frame
self.cameras = {}
for camera, settings in self.config.cameras.items():
# precalculate the coordinates for all the channels
y, u1, u2, v1, v2 = get_yuv_crop(
settings.frame_shape_yuv,
(
0,
0,
settings.frame_shape[1],
settings.frame_shape[0],
),
)
self.cameras[camera] = {
"last_active_frame": 0.0,
"current_frame": 0.0,
"layout_frame": 0.0,
"channel_dims": {
"y": y,
"u1": u1,
"u2": u2,
"v1": v1,
"v2": v2,
},
}
self.camera_layout = []
self.active_cameras = set()
self.layout_dim = 0
self.last_output_time = 0.0
def clear_frame(self):
logger.debug(f"Clearing the birdseye frame")
self.frame[:] = self.blank_frame
def copy_to_position(self, position, camera=None, frame_time=None):
if camera is None:
frame = None
channel_dims = None
else:
frame = self.frame_manager.get(
f"{camera}{frame_time}", self.config.cameras[camera].frame_shape_yuv
)
channel_dims = self.cameras[camera]["channel_dims"]
copy_yuv_to_position(
self.frame,
self.layout_offsets[position],
self.layout_frame_shape,
frame,
channel_dims,
)
def camera_active(self, object_box_count, motion_box_count):
if self.mode == "continuous":
return True
if self.mode == "motion" and object_box_count + motion_box_count > 0:
return True
if self.mode == "objects" and object_box_count > 0:
return True
def update_frame(self):
# determine how many cameras are tracking objects within the last 30 seconds
active_cameras = set(
[
cam
for cam, cam_data in self.cameras.items()
if cam_data["last_active_frame"] > 0
and cam_data["current_frame"] - cam_data["last_active_frame"] < 30
]
)
logger.debug(f"Active cameras: {active_cameras}")
# if there are no active cameras
if len(active_cameras) == 0:
# if the layout is already cleared
if len(self.camera_layout) == 0:
return False
# if the layout needs to be cleared
else:
self.camera_layout = []
self.clear_frame()
return True
# calculate layout dimensions
layout_dim = math.ceil(math.sqrt(len(active_cameras)))
logger.debug(f"New calculated layout dimensions: {layout_dim}")
# reset the layout if it needs to be different
if layout_dim != self.layout_dim:
logger.debug(f"Changing layout size from {self.layout_dim} to {layout_dim}")
self.layout_dim = layout_dim
self.camera_layout = [None] * layout_dim * layout_dim
# calculate resolution of each position in the layout
self.layout_frame_shape = (
self.frame_shape[0] // layout_dim, # height
self.frame_shape[1] // layout_dim, # width
)
self.clear_frame()
for cam_data in self.cameras.values():
cam_data["layout_frame"] = 0.0
self.active_cameras = set()
self.layout_offsets = []
# calculate the x and y offset for each position in the layout
for position in range(0, len(self.camera_layout)):
y_offset = self.layout_frame_shape[0] * math.floor(
position / self.layout_dim
)
x_offset = self.layout_frame_shape[1] * (position % self.layout_dim)
self.layout_offsets.append((y_offset, x_offset))
removed_cameras = self.active_cameras.difference(active_cameras)
added_cameras = active_cameras.difference(self.active_cameras)
self.active_cameras = active_cameras
# update each position in the layout
for position, camera in enumerate(self.camera_layout, start=0):
# if this camera was removed, replace it or clear it
if camera in removed_cameras:
# if replacing this camera with a newly added one
if len(added_cameras) > 0:
added_camera = added_cameras.pop()
self.camera_layout[position] = added_camera
self.copy_to_position(
position,
added_camera,
self.cameras[added_camera]["current_frame"],
)
self.cameras[added_camera]["layout_frame"] = self.cameras[
added_camera
]["current_frame"]
# if removing this camera with no replacement
else:
self.camera_layout[position] = None
self.copy_to_position(position)
removed_cameras.remove(camera)
# if an empty spot and there are cameras to add
elif camera is None and len(added_cameras) > 0:
added_camera = added_cameras.pop()
self.camera_layout[position] = added_camera
self.copy_to_position(
position,
added_camera,
self.cameras[added_camera]["current_frame"],
)
self.cameras[added_camera]["layout_frame"] = self.cameras[added_camera][
"current_frame"
]
# if not an empty spot and the camera has a newer frame, copy it
elif (
not camera is None
and self.cameras[camera]["current_frame"]
!= self.cameras[camera]["layout_frame"]
):
self.copy_to_position(
position, camera, self.cameras[camera]["current_frame"]
)
self.cameras[camera]["layout_frame"] = self.cameras[camera][
"current_frame"
]
return True
def update(self, camera, object_count, motion_count, frame_time, frame) -> bool:
# update the last active frame for the camera
self.cameras[camera]["current_frame"] = frame_time
if self.camera_active(object_count, motion_count):
last_active_frame = self.cameras[camera]["last_active_frame"]
# cleanup the old frame
if last_active_frame != 0.0:
frame_id = f"{camera}{last_active_frame}"
self.frame_manager.delete(frame_id)
self.cameras[camera]["last_active_frame"] = frame_time
now = datetime.datetime.now().timestamp()
# limit output to 10 fps
if (now - self.last_output_time) < 1 / 10:
return False
# if the frame was updated or the fps is too low, send frame
if self.update_frame() or (now - self.last_output_time) > 1:
self.last_output_time = now
return True
return False
def output_frames(config: FrigateConfig, video_output_queue):
threading.current_thread().name = f"output"
setproctitle(f"frigate.output")
stop_event = mp.Event()
def receiveSignal(signalNumber, frame):
stop_event.set()
signal.signal(signal.SIGTERM, receiveSignal)
signal.signal(signal.SIGINT, receiveSignal)
frame_manager = SharedMemoryFrameManager()
previous_frames = {}
# start a websocket server on 8082
WebSocketWSGIHandler.http_version = "1.1"
websocket_server = make_server(
"127.0.0.1",
8082,
server_class=WSGIServer,
handler_class=WebSocketWSGIRequestHandler,
app=WebSocketWSGIApplication(handler_cls=WebSocket),
)
websocket_server.initialize_websockets_manager()
websocket_thread = threading.Thread(target=websocket_server.serve_forever)
converters = {}
broadcasters = {}
for camera, cam_config in config.cameras.items():
converters[camera] = FFMpegConverter(
cam_config.frame_shape[1],
cam_config.frame_shape[0],
cam_config.frame_shape[1],
cam_config.frame_shape[0],
8,
)
broadcasters[camera] = BroadcastThread(
camera, converters[camera], websocket_server
)
if config.birdseye.enabled:
converters["birdseye"] = FFMpegConverter(
config.birdseye.width,
config.birdseye.height,
config.birdseye.width,
config.birdseye.height,
config.birdseye.quality,
)
broadcasters["birdseye"] = BroadcastThread(
"birdseye", converters["birdseye"], websocket_server
)
websocket_thread.start()
for t in broadcasters.values():
t.start()
birdseye_manager = BirdsEyeFrameManager(config, frame_manager)
while not stop_event.is_set():
try:
(
camera,
frame_time,
current_tracked_objects,
motion_boxes,
regions,
) = video_output_queue.get(True, 10)
except queue.Empty:
continue
frame_id = f"{camera}{frame_time}"
frame = frame_manager.get(frame_id, config.cameras[camera].frame_shape_yuv)
# send camera frame to ffmpeg process if websockets are connected
if any(
ws.environ["PATH_INFO"].endswith(camera) for ws in websocket_server.manager
):
# write to the converter for the camera if clients are listening to the specific camera
converters[camera].write(frame.tobytes())
# update birdseye if websockets are connected
if config.birdseye.enabled and any(
ws.environ["PATH_INFO"].endswith("birdseye")
for ws in websocket_server.manager
):
if birdseye_manager.update(
camera,
len(current_tracked_objects),
len(motion_boxes),
frame_time,
frame,
):
converters["birdseye"].write(birdseye_manager.frame.tobytes())
if camera in previous_frames:
# if the birdseye manager still needs this frame, don't delete it
if (
birdseye_manager.cameras[camera]["last_active_frame"]
!= previous_frames[camera]
):
frame_manager.delete(f"{camera}{previous_frames[camera]}")
previous_frames[camera] = frame_time
while not video_output_queue.empty():
(
camera,
frame_time,
current_tracked_objects,
motion_boxes,
regions,
) = video_output_queue.get(True, 10)
frame_id = f"{camera}{frame_time}"
frame = frame_manager.get(frame_id, config.cameras[camera].frame_shape_yuv)
frame_manager.delete(frame_id)
for c in converters.values():
c.exit()
for b in broadcasters.values():
b.join()
websocket_server.manager.close_all()
websocket_server.manager.stop()
websocket_server.manager.join()
websocket_server.shutdown()
websocket_thread.join()
logger.info("exiting output process...")