77 lines
3.0 KiB
Python
77 lines
3.0 KiB
Python
import signal
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import subprocess
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from typing import Optional, Tuple
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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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class CameraFfmpegPlugin(CameraPlugin):
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"""
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Plugin to interact with a camera over FFmpeg.
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Requires:
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* **ffmpeg** package installed on the system.
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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__(self, device: Optional[str] = '/dev/video0', input_format: str = 'v4l2', ffmpeg_args: Tuple[str] = (),
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**opts):
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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 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 ()
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def prepare_device(self, camera: FFmpegCamera) -> subprocess.Popen:
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warmup_seconds = self._get_warmup_seconds(camera)
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ffmpeg = [camera.info.ffmpeg_bin, '-y', '-f', camera.info.input_format, '-i', camera.info.device, '-s',
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'{}x{}'.format(*camera.info.resolution), '-ss', str(warmup_seconds),
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*(('-r', str(camera.info.fps)) if camera.info.fps else ()),
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'-pix_fmt', 'rgb24', '-f', 'rawvideo', *camera.info.ffmpeg_args, '-']
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self.logger.info('Running FFmpeg: {}'.format(' '.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: FFmpegCamera, preview: bool = False, *args, **kwargs):
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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, camera: FFmpegCamera):
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if camera.object:
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camera.object.terminate()
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if camera.object.stdout:
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camera.object.stdout.close()
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camera.object = None
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def wait_capture(self, camera: FFmpegCamera) -> None:
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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: {}'.format(str(e)))
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def capture_frame(self, camera: FFmpegCamera, *args, **kwargs) -> Optional[ImageType]:
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raw_size = camera.info.resolution[0] * camera.info.resolution[1] * 3
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data = camera.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', camera.info.resolution, data)
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# vim:sw=4:ts=4:et:
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