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# -*- coding: utf-8 -*-
#
# This file is part of Linux Show Player
#
# Copyright 2012-2016 Francesco Ceruti <ceppofrancy@gmail.com>
#
# Linux Show Player is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Linux Show Player is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Linux Show Player. If not, see <http://www.gnu.org/licenses/>.
from PyQt5 import QtCore
from PyQt5.QtGui import QLinearGradient, QColor, QPainter
from PyQt5.QtWidgets import QWidget
from lisp.core.configuration import config
from lisp.core.decorators import suppress_exceptions
class QDbMeter(QWidget):
DB_MIN = int(config["DbMeter"]["dbMin"])
DB_MAX = int(config["DbMeter"]["dbMax"])
DB_CLIP = int(config["DbMeter"]["dbClip"])
def __init__(self, parent):
super().__init__(parent)
db_range = abs(self.DB_MIN - self.DB_MAX)
yellow = abs(self.DB_MIN + 20) / db_range # -20 db
red = abs(self.DB_MIN) / db_range # 0 db
self.grad = QLinearGradient()
self.grad.setColorAt(0, QColor(0, 255, 0)) # Green
self.grad.setColorAt(yellow, QColor(255, 255, 0)) # Yellow
self.grad.setColorAt(red, QColor(255, 0, 0)) # Red
self.reset()
def reset(self):
self.peaks = [self.DB_MIN, self.DB_MIN]
self.rmss = [self.DB_MIN, self.DB_MIN]
self.decPeak = [self.DB_MIN, self.DB_MIN]
self.clipping = {}
self.repaint()
def plot(self, peaks, rms, decPeak):
self.peaks = peaks
self.rmss = rms
self.decPeak = decPeak
self.repaint()
@suppress_exceptions
def paintEvent(self, e):
if not self.visibleRegion().isEmpty():
# Stretch factor
mul = (self.height() - 4)
mul /= (self.DB_MAX - self.DB_MIN)
peaks = []
for n, peak in enumerate(self.peaks):
if peak > self.DB_CLIP:
self.clipping[n] = True
if peak < self.DB_MIN:
peak = self.DB_MIN
elif peak > self.DB_MAX:
peak = self.DB_MAX
peaks.append(round((peak - self.DB_MIN) * mul))
rmss = []
for n, rms in enumerate(self.rmss):
if rms < self.DB_MIN:
rms = self.DB_MIN
elif rms > self.DB_MAX:
rms = self.DB_MAX
rmss.append(round((rms - self.DB_MIN) * mul))
dPeaks = []
for dPeak in self.decPeak:
if dPeak < self.DB_MIN:
dPeak = self.DB_MIN
elif dPeak > self.DB_MAX:
dPeak = self.DB_MAX
dPeaks.append(round((dPeak - self.DB_MIN) * mul))
qp = QPainter()
qp.begin(self)
qp.setBrush(QColor(0, 0, 0, 0))
xpos = 0
xdim = self.width() / len(peaks)
for n, (peak, rms, dPeak) in enumerate(zip(peaks, rmss, dPeaks)):
# Maximum "peak-rect" size
maxRect = QtCore.QRectF(xpos, self.height() - 2, xdim - 2,
2 - self.height())
# Set QLinearGradient start and final-stop position
self.grad.setStart(maxRect.topLeft())
self.grad.setFinalStop(maxRect.bottomRight())
# Draw peak (audio peak in dB)
rect = QtCore.QRectF(xpos, self.height() - 2, xdim - 2, -peak)
qp.setOpacity(0.6)
qp.fillRect(rect, self.grad)
qp.setOpacity(1.0)
# Draw rms (in db)
rect = QtCore.QRectF(xpos, self.height() - 2, xdim - 2, -rms)
qp.fillRect(rect, self.grad)
# Draw decay peak
decRect = QtCore.QRectF(xpos, (self.height() - 3) - dPeak,
xdim - 2, 2)
qp.fillRect(decRect, self.grad)
# Draw Borders
if self.clipping.get(n, False):
qp.setPen(QColor(200, 0, 0))
else:
qp.setPen(QColor(100, 100, 100))
qp.drawRect(maxRect)
xpos += xdim
qp.end()
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