mirror of
https://github.com/blakeblackshear/frigate.git
synced 2024-11-21 19:07:46 +01:00
370 lines
14 KiB
Python
370 lines
14 KiB
Python
import os
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import time
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import datetime
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import cv2
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import queue
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import threading
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import ctypes
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import multiprocessing as mp
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import subprocess as sp
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import numpy as np
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import prctl
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import copy
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import itertools
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from collections import defaultdict
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from frigate.util import tonumpyarray, LABELS, draw_box_with_label, calculate_region, EventsPerSecond
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from frigate.object_detection import RegionPrepper, RegionRequester
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from frigate.objects import ObjectCleaner, BestFrames, DetectedObjectsProcessor, RegionRefiner, ObjectTracker
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from frigate.mqtt import MqttObjectPublisher
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# Stores 2 seconds worth of frames so they can be used for other threads
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class FrameTracker(threading.Thread):
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def __init__(self, frame_time, frame_ready, frame_lock, recent_frames):
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threading.Thread.__init__(self)
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self.frame_time = frame_time
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self.frame_ready = frame_ready
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self.frame_lock = frame_lock
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self.recent_frames = recent_frames
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def run(self):
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prctl.set_name(self.__class__.__name__)
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while True:
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# wait for a frame
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with self.frame_ready:
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self.frame_ready.wait()
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# delete any old frames
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stored_frame_times = list(self.recent_frames.keys())
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stored_frame_times.sort(reverse=True)
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if len(stored_frame_times) > 100:
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frames_to_delete = stored_frame_times[50:]
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for k in frames_to_delete:
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del self.recent_frames[k]
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def get_frame_shape(source):
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# capture a single frame and check the frame shape so the correct array
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# size can be allocated in memory
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video = cv2.VideoCapture(source)
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ret, frame = video.read()
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frame_shape = frame.shape
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video.release()
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return frame_shape
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def get_ffmpeg_input(ffmpeg_input):
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frigate_vars = {k: v for k, v in os.environ.items() if k.startswith('FRIGATE_')}
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return ffmpeg_input.format(**frigate_vars)
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class CameraWatchdog(threading.Thread):
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def __init__(self, camera):
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threading.Thread.__init__(self)
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self.camera = camera
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def run(self):
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prctl.set_name(self.__class__.__name__)
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while True:
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# wait a bit before checking
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time.sleep(10)
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if self.camera.frame_time.value != 0.0 and (datetime.datetime.now().timestamp() - self.camera.frame_time.value) > 300:
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print("last frame is more than 5 minutes old, restarting camera capture...")
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self.camera.start_or_restart_capture()
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time.sleep(5)
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# Thread to read the stdout of the ffmpeg process and update the current frame
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class CameraCapture(threading.Thread):
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def __init__(self, camera):
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threading.Thread.__init__(self)
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self.camera = camera
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def run(self):
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prctl.set_name(self.__class__.__name__)
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frame_num = 0
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while True:
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if self.camera.ffmpeg_process.poll() != None:
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print("ffmpeg process is not running. exiting capture thread...")
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break
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raw_image = self.camera.ffmpeg_process.stdout.read(self.camera.frame_size)
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if len(raw_image) == 0:
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print("ffmpeg didnt return a frame. something is wrong. exiting capture thread...")
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break
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frame_num += 1
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if (frame_num % self.camera.take_frame) != 0:
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continue
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with self.camera.frame_lock:
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# TODO: use frame_queue instead
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self.camera.frame_time.value = datetime.datetime.now().timestamp()
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self.camera.frame_cache[self.camera.frame_time.value] = (
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np
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.frombuffer(raw_image, np.uint8)
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.reshape(self.camera.frame_shape)
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)
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self.camera.frame_queue.put(self.camera.frame_time.value)
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# Notify with the condition that a new frame is ready
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with self.camera.frame_ready:
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self.camera.frame_ready.notify_all()
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self.camera.fps.update()
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class VideoWriter(threading.Thread):
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def __init__(self, camera):
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threading.Thread.__init__(self)
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self.camera = camera
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def run(self):
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prctl.set_name(self.__class__.__name__)
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while True:
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(frame_time, tracked_objects) = self.camera.frame_output_queue.get()
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# if len(tracked_objects) == 0:
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# continue
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# f = open(f"/debug/output/{self.camera.name}-{str(format(frame_time, '.8f'))}.jpg", 'wb')
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# f.write(self.camera.frame_with_objects(frame_time, tracked_objects))
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# f.close()
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class Camera:
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def __init__(self, name, ffmpeg_config, global_objects_config, config, prepped_frame_queue, mqtt_client, mqtt_prefix):
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self.name = name
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self.config = config
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self.detected_objects = defaultdict(lambda: [])
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self.frame_cache = {}
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self.last_processed_frame = None
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# queue for re-assembling frames in order
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self.frame_queue = queue.Queue()
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# track how many regions have been requested for a frame so we know when a frame is complete
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self.regions_in_process = {}
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# Lock to control access
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self.regions_in_process_lock = mp.Lock()
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self.finished_frame_queue = queue.Queue()
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self.refined_frame_queue = queue.Queue()
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self.frame_output_queue = queue.Queue()
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self.ffmpeg = config.get('ffmpeg', {})
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self.ffmpeg_input = get_ffmpeg_input(self.ffmpeg['input'])
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self.ffmpeg_global_args = self.ffmpeg.get('global_args', ffmpeg_config['global_args'])
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self.ffmpeg_hwaccel_args = self.ffmpeg.get('hwaccel_args', ffmpeg_config['hwaccel_args'])
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self.ffmpeg_input_args = self.ffmpeg.get('input_args', ffmpeg_config['input_args'])
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self.ffmpeg_output_args = self.ffmpeg.get('output_args', ffmpeg_config['output_args'])
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camera_objects_config = config.get('objects', {})
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self.take_frame = self.config.get('take_frame', 1)
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self.regions = self.config['regions']
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self.frame_shape = get_frame_shape(self.ffmpeg_input)
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self.frame_size = self.frame_shape[0] * self.frame_shape[1] * self.frame_shape[2]
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self.mqtt_client = mqtt_client
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self.mqtt_topic_prefix = '{}/{}'.format(mqtt_prefix, self.name)
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# create shared value for storing the frame_time
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self.frame_time = mp.Value('d', 0.0)
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# Lock to control access to the frame
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self.frame_lock = mp.Lock()
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# Condition for notifying that a new frame is ready
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self.frame_ready = mp.Condition()
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# Condition for notifying that objects were tracked
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self.objects_tracked = mp.Condition()
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# Queue for prepped frames, max size set to (number of regions * 5)
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max_queue_size = len(self.config['regions'])*5
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self.resize_queue = queue.Queue()
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# Queue for raw detected objects
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self.detected_objects_queue = queue.Queue()
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self.detected_objects_processor = DetectedObjectsProcessor(self)
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self.detected_objects_processor.start()
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# initialize the frame cache
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self.cached_frame_with_objects = {
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'frame_bytes': [],
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'frame_time': 0
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}
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self.ffmpeg_process = None
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self.capture_thread = None
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self.fps = EventsPerSecond()
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# combine tracked objects lists
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self.objects_to_track = set().union(global_objects_config.get('track', ['person', 'car', 'truck']), camera_objects_config.get('track', []))
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# merge object filters
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global_object_filters = global_objects_config.get('filters', {})
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camera_object_filters = camera_objects_config.get('filters', {})
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objects_with_config = set().union(global_object_filters.keys(), camera_object_filters.keys())
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self.object_filters = {}
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for obj in objects_with_config:
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self.object_filters[obj] = {**global_object_filters.get(obj, {}), **camera_object_filters.get(obj, {})}
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# start a thread to track objects
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self.object_tracker = ObjectTracker(self, 10)
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self.object_tracker.start()
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# start a thread to write tracked frames to disk
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self.video_writer = VideoWriter(self)
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self.video_writer.start()
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# start a thread to queue resize requests for regions
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self.region_requester = RegionRequester(self)
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self.region_requester.start()
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# start a thread to cache recent frames for processing
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self.frame_tracker = FrameTracker(self.frame_time,
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self.frame_ready, self.frame_lock, self.frame_cache)
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self.frame_tracker.start()
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# start a thread to resize regions
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self.region_prepper = RegionPrepper(self.frame_cache, self.resize_queue, prepped_frame_queue)
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self.region_prepper.start()
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# start a thread to store the highest scoring recent frames for monitored object types
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self.best_frames = BestFrames(self)
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self.best_frames.start()
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# start a thread to expire objects from the detected objects list
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self.object_cleaner = ObjectCleaner(self)
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self.object_cleaner.start()
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# start a thread to refine regions when objects are clipped
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self.dynamic_region_fps = EventsPerSecond()
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self.region_refiner = RegionRefiner(self)
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self.region_refiner.start()
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self.dynamic_region_fps.start()
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# start a thread to publish object scores
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mqtt_publisher = MqttObjectPublisher(self.mqtt_client, self.mqtt_topic_prefix, self)
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mqtt_publisher.start()
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# create a watchdog thread for capture process
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self.watchdog = CameraWatchdog(self)
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# load in the mask for object detection
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if 'mask' in self.config:
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self.mask = cv2.imread("/config/{}".format(self.config['mask']), cv2.IMREAD_GRAYSCALE)
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else:
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self.mask = None
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if self.mask is None:
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self.mask = np.zeros((self.frame_shape[0], self.frame_shape[1], 1), np.uint8)
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self.mask[:] = 255
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def start_or_restart_capture(self):
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if not self.ffmpeg_process is None:
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print("Terminating the existing ffmpeg process...")
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self.ffmpeg_process.terminate()
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try:
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print("Waiting for ffmpeg to exit gracefully...")
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self.ffmpeg_process.wait(timeout=30)
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except sp.TimeoutExpired:
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print("FFmpeg didnt exit. Force killing...")
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self.ffmpeg_process.kill()
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self.ffmpeg_process.wait()
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print("Waiting for the capture thread to exit...")
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self.capture_thread.join()
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self.ffmpeg_process = None
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self.capture_thread = None
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# create the process to capture frames from the input stream and store in a shared array
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print("Creating a new ffmpeg process...")
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self.start_ffmpeg()
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print("Creating a new capture thread...")
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self.capture_thread = CameraCapture(self)
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print("Starting a new capture thread...")
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self.capture_thread.start()
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self.fps.start()
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def start_ffmpeg(self):
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ffmpeg_cmd = (['ffmpeg'] +
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self.ffmpeg_global_args +
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self.ffmpeg_hwaccel_args +
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self.ffmpeg_input_args +
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['-i', self.ffmpeg_input] +
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self.ffmpeg_output_args +
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['pipe:'])
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print(" ".join(ffmpeg_cmd))
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self.ffmpeg_process = sp.Popen(ffmpeg_cmd, stdout = sp.PIPE, bufsize=self.frame_size)
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def start(self):
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self.start_or_restart_capture()
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self.watchdog.start()
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def join(self):
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self.capture_thread.join()
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def get_capture_pid(self):
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return self.ffmpeg_process.pid
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def get_best(self, label):
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return self.best_frames.best_frames.get(label)
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def stats(self):
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return {
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'camera_fps': self.fps.eps(60),
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'resize_queue': self.resize_queue.qsize(),
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'frame_queue': self.frame_queue.qsize(),
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'finished_frame_queue': self.finished_frame_queue.qsize(),
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'refined_frame_queue': self.refined_frame_queue.qsize(),
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'regions_in_process': self.regions_in_process,
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'dynamic_regions_per_sec': self.dynamic_region_fps.eps()
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}
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def frame_with_objects(self, frame_time, tracked_objects=None):
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frame = self.frame_cache[frame_time].copy()
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detected_objects = self.detected_objects[frame_time].copy()
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for region in self.regions:
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color = (255,255,255)
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cv2.rectangle(frame, (region['x_offset'], region['y_offset']),
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(region['x_offset']+region['size'], region['y_offset']+region['size']),
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color, 2)
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# draw the bounding boxes on the screen
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if tracked_objects is None:
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tracked_objects = copy.deepcopy(self.object_tracker.tracked_objects)
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for obj in detected_objects:
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draw_box_with_label(frame, obj['box']['xmin'], obj['box']['ymin'], obj['box']['xmax'], obj['box']['ymax'], obj['name'], f"{int(obj['score']*100)}% {obj['area']}", thickness=3)
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for id, obj in tracked_objects.items():
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color = (0, 255,0) if obj['frame_time'] == frame_time else (255, 0, 0)
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draw_box_with_label(frame, obj['box']['xmin'], obj['box']['ymin'], obj['box']['xmax'], obj['box']['ymax'], obj['name'], f"{id}", color=color, thickness=1, position='bl')
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# print a timestamp
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time_to_show = datetime.datetime.fromtimestamp(frame_time).strftime("%m/%d/%Y %H:%M:%S")
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cv2.putText(frame, time_to_show, (10, 30), cv2.FONT_HERSHEY_SIMPLEX, fontScale=.8, color=(255, 255, 255), thickness=2)
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# print fps
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cv2.putText(frame, str(self.fps.eps())+'FPS', (10, 60), cv2.FONT_HERSHEY_SIMPLEX, fontScale=.8, color=(255, 255, 255), thickness=2)
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# convert to BGR
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frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)
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# encode the image into a jpg
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ret, jpg = cv2.imencode('.jpg', frame)
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return jpg.tobytes()
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def get_current_frame_with_objects(self):
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frame_time = self.last_processed_frame
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if frame_time == self.cached_frame_with_objects['frame_time']:
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return self.cached_frame_with_objects['frame_bytes']
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frame_bytes = self.frame_with_objects(frame_time)
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self.cached_frame_with_objects = {
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'frame_bytes': frame_bytes,
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'frame_time': frame_time
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}
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return frame_bytes
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