306 lines
10 KiB
Python
306 lines
10 KiB
Python
import os
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import time
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from typing import IO, Optional, 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 .model import PiCameraInfo, PiCamera
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class CameraPiPlugin(CameraPlugin):
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"""
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Plugin to interact with a `Pi Camera
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<https://www.raspberrypi.com/documentation/accessories/camera.html>`_.
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This integration is intended to work with the `picamera2
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<https://github.com/raspberrypi/picamera2>`_ module.
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If you are running a very old OS that only provides the deprecated
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`picamera <https://github.com/waveform80/picamera>`_ module, or you rely on
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features that are currently only supported by the old module, you should
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use :class:`platypush.plugins.camera.pi_legacy.CameraPiLegacyPlugin`
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instead.
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"""
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_camera_class = PiCamera
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_camera_info_class = PiCameraInfo
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_awb_modes = [
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"Auto",
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"Incandescent",
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"Tungsten",
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"Fluorescent",
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"Indoor",
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"Daylight",
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"Cloudy",
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]
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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: float = 1.0,
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contrast: float = 1.0,
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brightness: float = 0.0,
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iso: int = 0,
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exposure_compensation: float = 0.0,
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awb_mode: str = 'Auto',
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stream_format: str = 'h264',
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**camera,
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):
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"""
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:param device: Camera device number (default: 0). Only supported on
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devices with multiple camera slots.
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:param fps: Frames per second (default: 30.0).
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:param warmup_seconds: Seconds to wait for the camera to warm up
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before taking a photo (default: 2.0).
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:param sharpness: Sharpness level, as a float between 0.0 and 16.0,
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where 1.0 is the default value, and higher values are mapped to
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higher sharpness levels.
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:param contrast: Contrast level, as a float between 0.0 and 32.0, where
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1.0 is the default value, and higher values are mapped to higher
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contrast levels.
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:param brightness: Brightness level, as a float between -1.0 and 1.0.
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:param video_stabilization: Enable video stabilization (default: False).
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Only available on the old picamera module for now.
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:param iso: ISO level (default: 0).
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:param exposure_compensation: Exposure compensation level, as a float
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between -8.0 and 8.0.
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:param awb_mode: Auto white balance mode. Allowed values:
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- ``Auto`` (default)
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- ``Daylight``
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- ``Cloudy``
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- ``Indoor``
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- ``Fluorescent``
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:param stream_format: Default format for the output when streamed to a
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network device. Available:
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- ``h264`` (default)
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- ``mjpeg``
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:param camera: Options for the base camera plugin (see
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:class:`platypush.plugins.camera.CameraPlugin`).
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"""
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super().__init__(
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device=device,
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fps=fps,
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warmup_seconds=warmup_seconds,
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stream_format=stream_format,
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**camera,
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)
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self.camera_info.sharpness = sharpness # type: ignore
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self.camera_info.contrast = contrast # type: ignore
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self.camera_info.brightness = brightness # type: ignore
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self.camera_info.iso = iso # type: ignore
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self.camera_info.exposure_compensation = exposure_compensation # type: ignore
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self.camera_info.awb_mode = awb_mode # type: ignore
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def _get_transform(self, device: Camera):
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from libcamera import Orientation, Transform # type: ignore
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from picamera2.utils import orientation_to_transform # type: ignore
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rot = device.info.rotate
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if not rot:
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return Transform(
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# It may seem counterintuitive, but the picamera2 library's flip
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# definition is the opposite of ours
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hflip=device.info.vertical_flip,
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vflip=device.info.horizontal_flip,
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)
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if rot == 90:
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orient = (
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Orientation.Rotate90Mirror
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if device.info.vertical_flip
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else Orientation.Rotate90
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)
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elif rot == 180:
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orient = (
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Orientation.Rotate180Mirror
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if device.info.horizontal_flip
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else Orientation.Rotate180
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)
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elif rot == 270:
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orient = (
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Orientation.Rotate270Mirror
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if device.info.vertical_flip
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else Orientation.Rotate270
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)
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else:
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raise AssertionError(
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f'Invalid rotation: {rot}. Supported values: 0, 90, 180, 270'
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)
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return orientation_to_transform(orient)
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def prepare_device(
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self,
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device: Camera,
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start: bool = True,
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video: bool = False,
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stream: bool = False,
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**_,
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):
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from picamera2 import Picamera2 # type: ignore
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assert isinstance(device, PiCamera), f'Invalid device type: {type(device)}'
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camera = Picamera2(camera_num=device.info.device)
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still = not (video or stream)
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cfg_params = {
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'main': {
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'format': 'XBGR8888' if not still else 'BGR888',
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**(
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{'size': tuple(map(int, device.info.resolution))}
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if device.info.resolution
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else {}
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),
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},
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**(
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{'transform': self._get_transform(device)}
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if not still
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# We don't need to flip the image for individual frames, the base camera
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# class methods will take care of that
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else {}
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),
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'controls': {
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'Brightness': float(device.info.brightness),
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'Contrast': float(device.info.contrast),
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'Sharpness': float(device.info.sharpness),
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'AwbMode': self._awb_modes.index(device.info.awb_mode),
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},
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}
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cfg = (
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camera.create_video_configuration
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if not still
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else camera.create_still_configuration
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)(**cfg_params)
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camera.configure(cfg)
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if start:
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camera.start()
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time.sleep(max(1, device.info.warmup_seconds))
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return camera
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def release_device(self, device: Camera):
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if device.object:
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device.object.stop()
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device.object.close()
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def capture_frame(self, device: Camera, *_, **__):
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assert device.object, 'Camera not open'
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return device.object.capture_image('main')
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@property
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def _video_encoders_by_format(self) -> dict:
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from picamera2.encoders import H264Encoder, MJPEGEncoder # type: ignore
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return {
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'h264': H264Encoder,
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'mjpeg': MJPEGEncoder,
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}
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@action
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def capture_video(
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self,
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device: Optional[int] = None,
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duration: Optional[float] = None,
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video_file: Optional[str] = None,
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preview: bool = False,
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**camera,
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) -> Optional[Union[str, dict]]:
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"""
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Capture a video.
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:param device: 0-based index of the camera to capture from, if the
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device supports multiple cameras. Default: use the configured
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camera index or the first available camera.
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:param duration: Record duration in seconds (default: None, record
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until :meth:`.stop_capture``).
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:param video_file: If set, the stream will be recorded to the specified
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video file (default: None).
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:param camera: Camera parameters override - see constructors parameters.
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:param preview: Show a preview of the camera frames.
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:return: If duration is specified, the method will wait until the
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recording is done and return the local path to the recorded
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resource. Otherwise, it will return the status of the camera device
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after starting it.
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"""
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from picamera2 import Picamera2 # type: ignore
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from picamera2.encoders import H264Encoder # type: ignore
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assert video_file, 'Video file is required'
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camera = self.open_device(
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device=device, ctx={'start': False, 'video': True}, **camera
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)
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encoder = H264Encoder()
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assert camera.object, 'Camera not open'
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assert isinstance(
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camera.object, Picamera2
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), f'Invalid camera object type: {type(camera.object)}'
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if preview:
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camera.object.start_preview()
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# Only H264 is supported for now
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camera.object.start_recording(encoder, os.path.expanduser(video_file))
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if duration:
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self.wait_stop(duration)
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try:
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if preview:
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camera.object.stop_preview()
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finally:
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if camera.object:
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camera.object.stop_recording()
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camera.object.close()
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return video_file
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return self.status(camera.info.device).output
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def _streaming_loop(self, camera: Camera, stream_format: str, sock: IO, *_, **__):
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from picamera2 import Picamera2 # type: ignore
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from picamera2.outputs import FileOutput # type: ignore
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encoder_cls = self._video_encoders_by_format.get(stream_format.lower())
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assert (
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encoder_cls
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), f'Invalid stream format: {stream_format}. Supported formats: {", ".join(self._video_encoders_by_format)}'
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assert isinstance(camera, PiCamera), f'Invalid camera type: {type(camera)}'
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assert camera.object and isinstance(
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camera.object, Picamera2
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), f'Invalid camera object type: {type(camera.object)}'
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cam = camera.object
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encoder = encoder_cls()
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cam.encoders = encoder
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encoder.output = FileOutput(sock)
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cam.start_encoder(encoder)
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cam.start()
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def _prepare_stream_writer(self, *_, **__):
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"""
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Overrides the base method to do nothing - the stream writer is handled
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by the picamera2 library.
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"""
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def _cleanup_stream(self, camera: Camera, *_, **__):
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cam = camera.object
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if not cam:
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return
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cam.stop()
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cam.stop_encoder()
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cam.close()
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# vim:sw=4:ts=4:et:
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