#!/usr/bin/env python3
# (c) 2015 Taeyeon Mori
# Easily toggle the IEC958 In Phase Inverse of an ALSA card
# Useful for looping back audio from a PS3 through a CMedia card with IEC958-In

from PyQt5 import QtCore, QtGui, QtWidgets
import subprocess
import sys


class MainWindow(QtWidgets.QMainWindow):
    amixer_args = ("-c", "2")

    def __init__(self, parent=None):
        super().__init__(parent)

        self.l = QtWidgets.QHBoxLayout()

        self.label = QtWidgets.QLabel()
        self.label.setObjectName("MainWindow.label")
        self.l.addWidget(self.label)

        self.button = QtWidgets.QPushButton("Toggle")
        self.button.setObjectName("MainWindow.button")
        self.button.clicked.connect(self.on_button_clicked)
        self.l.addWidget(self.button)

        self.cw = QtWidgets.QWidget()
        self.cw.setLayout(self.l)
        self.setCentralWidget(self.cw)

        self.sc = QtWidgets.QShortcut(QtGui.QKeySequence("t"), self)
        self.sc.activated.connect(self.on_button_clicked)

        self.get_state()

    def call(self, *args):
        return subprocess.check_output(("amixer",) + self.amixer_args + args).decode("utf-8")

    def get_state(self):
        self.label.setText(self.call("sget", "IEC958 In Phase Inverse"))

    def on_button_clicked(self):
        self.label.setText(self.call("sset", "IEC958 In Phase Inverse", "toggle"))


app = QtWidgets.QApplication(sys.argv)
win = MainWindow()
win.show()
app.exec()