105 lines
3.6 KiB
Python
105 lines
3.6 KiB
Python
import signal
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import subprocess
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from typing import Iterable, Optional
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from PIL import Image
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from PIL.Image import Image as ImageType
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from platypush.plugins.camera import CameraPlugin
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from platypush.plugins.camera.ffmpeg.model import FFmpegCamera, FFmpegCameraInfo
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from platypush.plugins.camera.model.camera import Camera
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class CameraFfmpegPlugin(CameraPlugin):
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"""
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Plugin to interact with a camera over FFmpeg.
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"""
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_camera_class = FFmpegCamera
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_camera_info_class = FFmpegCameraInfo
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def __init__(
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self,
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device: Optional[str] = '/dev/video0',
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input_format: str = 'v4l2',
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ffmpeg_args: Iterable[str] = (),
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**opts,
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):
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"""
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:param device: Path to the camera device (default: ``/dev/video0``).
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:param input_format: FFmpeg input format for the camera device (default: ``v4l2``).
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:param ffmpeg_args: Extra options to be passed to the FFmpeg executable.
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:param opts: Camera options - see constructor of :class:`platypush.plugins.camera.CameraPlugin`.
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"""
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super().__init__(device=device, input_format=input_format, **opts)
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self.camera_info.ffmpeg_args = ffmpeg_args or () # type: ignore
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def prepare_device(self, device: Camera, **_) -> subprocess.Popen:
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assert isinstance(device, FFmpegCamera)
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warmup_seconds = self._get_warmup_seconds(device)
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ffmpeg = [
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device.info.ffmpeg_bin,
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'-y',
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'-f',
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device.info.input_format,
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'-i',
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device.info.device,
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'-s',
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*(
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(f'{device.info.resolution[0]}x{device.info.resolution[1]}',)
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if device.info.resolution
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else ()
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),
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'-ss',
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str(warmup_seconds),
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*(('-r', str(device.info.fps)) if device.info.fps else ()),
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'-pix_fmt',
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'rgb24',
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'-f',
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'rawvideo',
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*device.info.ffmpeg_args,
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'-',
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]
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self.logger.info('Running FFmpeg command: "%s"', ' '.join(ffmpeg))
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proc = subprocess.Popen(ffmpeg, stdout=subprocess.PIPE)
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# Start in suspended mode
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proc.send_signal(signal.SIGSTOP)
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return proc
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def start_camera(self, camera: Camera, *args, preview: bool = False, **kwargs):
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assert isinstance(camera, FFmpegCamera)
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super().start_camera(*args, camera=camera, preview=preview, **kwargs)
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if camera.object:
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camera.object.send_signal(signal.SIGCONT)
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def release_device(self, device: Camera):
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assert isinstance(device, FFmpegCamera)
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if device.object:
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device.object.terminate()
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if device.object.stdout:
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device.object.stdout.close()
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device.object = None # type: ignore
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def wait_capture(self, camera: Camera):
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assert isinstance(camera, FFmpegCamera)
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if camera.object and camera.object.poll() is None:
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try:
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camera.object.wait(timeout=camera.info.capture_timeout)
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except Exception as e:
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self.logger.warning('Error on FFmpeg capture wait: %s', e)
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def capture_frame(self, device: Camera, *_, **__) -> Optional[ImageType]:
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assert isinstance(device, FFmpegCamera)
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assert device.info.resolution, 'Resolution not set'
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assert device.object.stdout, 'Camera not started'
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raw_size = device.info.resolution[0] * device.info.resolution[1] * 3
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data = device.object.stdout.read(raw_size)
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if len(data) < raw_size:
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return
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return Image.frombytes('RGB', device.info.resolution, data)
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# vim:sw=4:ts=4:et:
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