209 lines
7.0 KiB
Python
209 lines
7.0 KiB
Python
import threading
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import time
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from typing import Optional, List, Tuple, Union
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from platypush.plugins import action
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from platypush.plugins.camera import CameraPlugin, Camera
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from platypush.plugins.camera.pi.model import PiCameraInfo, PiCamera
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class CameraPiPlugin(CameraPlugin):
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"""
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Plugin to control a Pi camera.
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.. warning::
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This plugin is **DEPRECATED**, as it relies on the old ``picamera`` module.
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On recent systems, it should be possible to access the Pi Camera through
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the ffmpeg or gstreamer integrations.
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"""
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_camera_class = PiCamera
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_camera_info_class = PiCameraInfo
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def __init__(
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self,
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device: int = 0,
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fps: float = 30.0,
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warmup_seconds: float = 2.0,
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sharpness: int = 0,
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contrast: int = 0,
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brightness: int = 50,
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video_stabilization: bool = False,
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iso: int = 0,
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exposure_compensation: int = 0,
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exposure_mode: str = 'auto',
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meter_mode: str = 'average',
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awb_mode: str = 'auto',
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image_effect: str = 'none',
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led_pin: Optional[int] = None,
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color_effects: Optional[Union[str, List[str]]] = None,
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zoom: Tuple[float, float, float, float] = (0.0, 0.0, 1.0, 1.0),
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**camera
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):
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"""
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See https://www.raspberrypi.org/documentation/usage/camera/python/README.md
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for a detailed reference about the Pi camera options.
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:param camera: Options for the base camera plugin (see :class:`platypush.plugins.camera.CameraPlugin`).
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"""
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super().__init__(
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device=device, fps=fps, warmup_seconds=warmup_seconds, **camera
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)
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self.camera_info.sharpness = sharpness
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self.camera_info.contrast = contrast
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self.camera_info.brightness = brightness
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self.camera_info.video_stabilization = video_stabilization
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self.camera_info.iso = iso
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self.camera_info.exposure_compensation = exposure_compensation
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self.camera_info.meter_mode = meter_mode
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self.camera_info.exposure_mode = exposure_mode
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self.camera_info.awb_mode = awb_mode
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self.camera_info.image_effect = image_effect
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self.camera_info.color_effects = color_effects
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self.camera_info.zoom = zoom
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self.camera_info.led_pin = led_pin
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# noinspection DuplicatedCode
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def prepare_device(self, device: PiCamera):
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# noinspection PyUnresolvedReferences
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import picamera
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camera = picamera.PiCamera(
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camera_num=device.info.device,
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resolution=device.info.resolution,
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framerate=device.info.fps,
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led_pin=device.info.led_pin,
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)
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camera.hflip = device.info.horizontal_flip
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camera.vflip = device.info.vertical_flip
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camera.sharpness = device.info.sharpness
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camera.contrast = device.info.contrast
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camera.brightness = device.info.brightness
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camera.video_stabilization = device.info.video_stabilization
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camera.iso = device.info.iso
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camera.exposure_compensation = device.info.exposure_compensation
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camera.exposure_mode = device.info.exposure_mode
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camera.meter_mode = device.info.meter_mode
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camera.awb_mode = device.info.awb_mode
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camera.image_effect = device.info.image_effect
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camera.color_effects = device.info.color_effects
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camera.rotation = device.info.rotate or 0
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camera.zoom = device.info.zoom
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return camera
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def release_device(self, device: PiCamera):
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# noinspection PyUnresolvedReferences
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import picamera
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if device.object:
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try:
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device.object.stop_recording()
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except (ConnectionError, picamera.PiCameraNotRecording):
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pass
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if device.object and not device.object.closed:
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try:
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device.object.close()
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except (ConnectionError, picamera.PiCameraClosed):
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pass
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def capture_frame(self, camera: Camera, *args, **kwargs):
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import numpy as np
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from PIL import Image
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shape = (
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camera.info.resolution[1] + (camera.info.resolution[1] % 16),
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camera.info.resolution[0] + (camera.info.resolution[0] % 32),
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3,
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)
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frame = np.empty(shape, dtype=np.uint8)
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camera.object.capture(frame, 'rgb')
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return Image.fromarray(frame)
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def start_preview(self, camera: Camera):
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"""
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Start camera preview.
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"""
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camera.object.start_preview()
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def stop_preview(self, camera: Camera):
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"""
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Stop camera preview.
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"""
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try:
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camera.object.stop_preview()
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except Exception as e:
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self.logger.warning(str(e))
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@action
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def capture_preview(
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self, duration: Optional[float] = None, n_frames: Optional[int] = None, **camera
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) -> dict:
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camera = self.open_device(**camera)
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self.start_preview(camera)
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if n_frames:
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duration = n_frames * (camera.info.fps or 0)
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if duration:
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threading.Timer(duration, lambda: self.stop_preview(camera))
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return self.status()
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def streaming_thread(
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self, camera: PiCamera, stream_format: str, duration: Optional[float] = None
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):
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server_socket = self._prepare_server_socket(camera)
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sock = None
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streaming_started_time = time.time()
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self.logger.info(
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'Starting streaming on port {}'.format(camera.info.listen_port)
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)
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try:
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while camera.stream_event.is_set():
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if duration and time.time() - streaming_started_time >= duration:
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break
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sock = self._accept_client(server_socket)
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if not sock:
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continue
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if camera.object is None or camera.object.closed:
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camera = self.open_device(**camera.info.to_dict())
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try:
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camera.object.start_recording(sock, format=stream_format)
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while camera.stream_event.is_set():
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camera.object.wait_recording(1)
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except ConnectionError:
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self.logger.info('Client closed connection')
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finally:
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if sock:
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try:
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sock.close()
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except Exception as e:
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self.logger.warning(
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'Error while closing client socket: {}'.format(str(e))
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)
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self.close_device(camera)
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finally:
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self._cleanup_stream(camera, server_socket, sock)
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self.logger.info('Stopped camera stream')
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@action
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def start_streaming(
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self, duration: Optional[float] = None, stream_format: str = 'h264', **camera
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) -> dict:
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camera = self.open_device(stream_format=stream_format, **camera)
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return self._start_streaming(camera, duration, stream_format)
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# vim:sw=4:ts=4:et:
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