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https://github.com/EyeTrackVR/EyeTrackVR.git
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Separe http image stream from wired camera image capture
Fixes the errors with not being able to detect video source or not being able to find starting number
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parent
5580d482f9
commit
d30b6fb37f
@ -1,65 +1,116 @@
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from time import sleep
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import numpy
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from config import RansacConfig
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import requests
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from enum import Enum
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import threading
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import queue
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import runpy
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import cv2
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class CameraState(Enum):
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CONNECTED = 1
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DISCONNECTED = 2
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CONNECTED = 1
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DISCONNECTED = 2
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class Camera:
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def __init__(self, config: RansacConfig, camera_index: int, cancellation_event: "threading.Event", capture_event: "threading.Event", camera_status_outgoing: "queue.Queue[CameraState]", camera_output_outgoing: "queue.Queue"):
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self.config = config
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self.camera_index = camera_index
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self.camera_address = config.capture_source
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self.camera_status_outgoing = camera_status_outgoing
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self.camera_output_outgoing = camera_output_outgoing
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self.capture_event = capture_event
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self.cancellation_event = cancellation_event
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self.current_capture_source = config.capture_source
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self.capture_source: "cv2.VideoCapture" = cv2.VideoCapture(config.capture_source)
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def __init__(self, config: RansacConfig, camera_index: int, cancellation_event: "threading.Event",
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capture_event: "threading.Event", camera_status_outgoing: "queue.Queue[CameraState]",
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camera_output_outgoing: "queue.Queue"):
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self.config = config
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self.camera_index = camera_index
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self.camera_address = config.capture_source
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self.camera_status_outgoing = camera_status_outgoing
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self.camera_output_outgoing = camera_output_outgoing
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self.capture_event = capture_event
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self.cancellation_event = cancellation_event
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self.current_capture_source = config.capture_source
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self.wired_camera: "cv2.VideoCapture" = cv2.VideoCapture(config.capture_source, cv2.CAP_FFMPEG)
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self.stream = None
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self.stream_frame_number = 0
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self.stream_bytes = bytes()
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self.error_message = "Capture source {} not found, retrying in 500ms"
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def set_output_queue(self, camera_output_outgoing: "queue.Queue"):
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self.camera_output_outgoing = camera_output_outgoing
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def set_output_queue(self, camera_output_outgoing: "queue.Queue"):
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self.camera_output_outgoing = camera_output_outgoing
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def run(self):
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while True:
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if self.cancellation_event.is_set():
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print("Exiting capture thread")
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return
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def run(self):
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while True:
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if self.cancellation_event.is_set():
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print("Exiting capture thread")
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return
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# If things aren't open, retry until they are. Don't let read requests come in any earlier
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# than this, otherwise we can deadlock ourselves.
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if not self.capture_source.isOpened() or (self.config.capture_source != self.current_capture_source):
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print(f"Capture source {self.config.capture_source} not found, retrying in 500ms")
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sleep(0.5)
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self.current_capture_source = self.config.capture_source
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self.capture_source = cv2.VideoCapture(self.current_capture_source)
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continue
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# If things aren't open, retry until they are. Don't let read requests come in any earlier
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# than this, otherwise we can deadlock ourselves.
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if type(self.config.capture_source) == str and "http" in self.config.capture_source:
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try:
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self.stream = requests.get(self.config.capture_source, stream=True)
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except requests.exceptions.RequestException:
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print(self.error_message.format(self.config.capture_source))
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else:
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# so, they might have switched to a wired camera for some reason, no need to keep the stream running
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self.cleanup_stream()
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# Assuming we can access our capture source, wait for another thread to request a capture.
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# Cycle every so often to see if our cancellation token has fired. This basically uses a
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# python event as a contextless, resettable one-shot channel.
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if not self.capture_event.wait(timeout=0.02):
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continue
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if not self.wired_camera.isOpened() or self.config.capture_source != self.current_capture_source:
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print(self.error_message.format(self.config.capture_source))
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sleep(0.5)
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self.current_capture_source = self.config.capture_source
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self.wired_camera = cv2.VideoCapture(self.current_capture_source, cv2.CAP_FFMPEG)
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continue
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try:
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ret, image = self.capture_source.read()
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if not ret:
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self.capture_source.set(cv2.CAP_PROP_POS_FRAMES, 0)
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raise RuntimeError("Problem while getting frame")
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frame_number = self.capture_source.get(cv2.CAP_PROP_POS_FRAMES)
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fps = self.capture_source.get(cv2.CAP_PROP_FPS)
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# Assuming we can access our capture source, wait for another thread to request a capture.
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# Cycle every so often to see if our cancellation token has fired. This basically uses a
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# python event as a contextless, resettable one-shot channel.
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if not self.capture_event.wait(timeout=0.02):
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continue
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if self.stream:
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self.get_stream_picture()
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else:
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self.get_wired_camera_picture()
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def get_stream_picture(self):
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for chunk in self.stream.iter_content(chunk_size=1024):
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self.stream_bytes += chunk
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# mjpeg streams are encoded into frames starting and ending with those bytes
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starting_section = self.stream_bytes.find(b'\xff\xd8')
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closing_section = self.stream_bytes.find(b'\xff\xd9')
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if starting_section != -1 and closing_section != -1:
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# we extract the encoded image first, and then prepare the buffer for another frame
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jpg_data = self.stream_bytes[starting_section:closing_section+2]
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self.stream_frame_number += 1
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self.stream_bytes = self.stream_bytes[closing_section+2:]
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image = cv2.imdecode(numpy.fromstring(jpg_data, dtype=numpy.uint8), cv2.IMREAD_COLOR)
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self.push_image_to_queue(image, self.stream_frame_number, 60)
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def get_wired_camera_picture(self):
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try:
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ret, image = self.wired_camera.read()
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if not ret:
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self.wired_camera.set(cv2.CAP_PROP_POS_FRAMES, 0)
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raise RuntimeError("Problem while getting frame")
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frame_number = self.wired_camera.get(cv2.CAP_PROP_POS_FRAMES)
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fps = self.wired_camera.get(cv2.CAP_PROP_FPS)
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self.push_image_to_queue(image, frame_number, fps)
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except:
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# print("Capture source problem, assuming camera disconnected, waiting for reconnect.")
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pass
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def cleanup_stream(self):
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if self.stream:
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self.stream.close()
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self.stream_bytes = None
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self.stream_frame_number = 0
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def push_image_to_queue(self, image, frame_number, fps):
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# If there's backpressure, just yell. We really shouldn't have this unless we start getting
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# some sort of capture event conflict though.
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qsize = self.camera_output_outgoing.qsize()
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if qsize > 1:
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print(f"CAPTURE QUEUE BACKPRESSURE OF {qsize}. CHECK FOR CRASH OR TIMING ISSUES IN ALGORITHM.")
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print(f"CAPTURE QUEUE BACKPRESSURE OF {qsize}. CHECK FOR CRASH OR TIMING ISSUES IN ALGORITHM.")
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self.camera_output_outgoing.put((image, frame_number, fps))
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self.capture_event.clear()
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except:
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# print("Capture source problem, assuming camera disconnected, waiting for reconnect.")
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continue
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self.capture_event.clear()
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