92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
#!/usr/bin/env python3
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#
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# Electron Cash - lightweight Bitcoin client
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# Copyright (C) 2019 Axel Gembe <derago@gmail.com>
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from typing import List
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from PyQt5.QtMultimedia import (QVideoFrame, QAbstractVideoBuffer, QAbstractVideoSurface,
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QVideoSurfaceFormat)
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from PyQt5.QtGui import QImage
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from PyQt5.QtCore import QObject, pyqtSignal
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from electrum.i18n import _
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from electrum.logging import get_logger
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_logger = get_logger(__name__)
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class QrReaderVideoSurface(QAbstractVideoSurface):
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"""
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Receives QVideoFrames from QCamera, converts them into a QImage, flips the X and Y axis if
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necessary and sends them to listeners via the frame_available event.
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"""
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def __init__(self, parent: QObject = None):
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super().__init__(parent)
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def present(self, frame: QVideoFrame) -> bool:
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if not frame.isValid():
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return False
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image_format = QVideoFrame.imageFormatFromPixelFormat(frame.pixelFormat())
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if image_format == QVideoFrame.Format_Invalid:
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_logger.info(_('QR code scanner for video frame with invalid pixel format'))
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return False
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if not frame.map(QAbstractVideoBuffer.ReadOnly):
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_logger.info(_('QR code scanner failed to map video frame'))
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return False
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try:
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img = QImage(int(frame.bits()), frame.width(), frame.height(), image_format)
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# Check whether we need to flip the image on any axis
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surface_format = self.surfaceFormat()
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flip_x = surface_format.isMirrored()
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flip_y = surface_format.scanLineDirection() == QVideoSurfaceFormat.BottomToTop
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# Mirror the image if needed
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if flip_x or flip_y:
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img = img.mirrored(flip_x, flip_y)
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# Create a copy of the image so the original frame data can be freed
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img = img.copy()
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finally:
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frame.unmap()
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self.frame_available.emit(img)
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return True
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def supportedPixelFormats(self, handle_type: QAbstractVideoBuffer.HandleType) -> List[QVideoFrame.PixelFormat]:
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if handle_type == QAbstractVideoBuffer.NoHandle:
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# We support all pixel formats that can be understood by QImage directly
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return [QVideoFrame.Format_ARGB32, QVideoFrame.Format_ARGB32_Premultiplied,
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QVideoFrame.Format_RGB32, QVideoFrame.Format_RGB24, QVideoFrame.Format_RGB565,
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QVideoFrame.Format_RGB555, QVideoFrame.Format_ARGB8565_Premultiplied]
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return []
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frame_available = pyqtSignal(QImage)
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