Carla/source/native-plugins/resources/carla-plugin

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Carla plugin host (plugin UI)
# Copyright (C) 2013-2016 Filipe Coelho <falktx@falktx.com>
#
# This program 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 2 of
# the License, or any later version.
#
# This program 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.
#
# For a full copy of the GNU General Public License see the GPL.txt file

# ------------------------------------------------------------------------------------------------------------
# Imports (Config)

from carla_config import *

# ------------------------------------------------------------------------------------------------------------
# Imports (Global)

if config_UseQt5:
    from PyQt5.QtGui import QKeySequence
    from PyQt5.QtWidgets import QHBoxLayout
else:
    from PyQt4.QtGui import QHBoxLayout, QKeySequence

# ------------------------------------------------------------------------------------------------------------
# Imports (Custom Stuff)

from carla_host import *
from externalui import ExternalUI

# ------------------------------------------------------------------------------------------------------------
# Host Plugin object

class PluginHost(CarlaHostQtPlugin):
    def __init__(self):
        CarlaHostQtPlugin.__init__(self)

        if False:
            # kdevelop likes this :)
            self.fExternalUI = ExternalUI()

        # ---------------------------------------------------------------

        self.fExternalUI = None

    # -------------------------------------------------------------------

    def setExternalUI(self, extUI):
        self.fExternalUI = extUI

    def sendMsg(self, lines):
        if self.fExternalUI is None:
            return False

        return self.fExternalUI.send(lines)

    # -------------------------------------------------------------------

    def engine_init(self, driverName, clientName):
        return True

    def engine_close(self):
        return True

    def engine_idle(self):
        self.fExternalUI.idleExternalUI()

    def is_engine_running(self):
        return self.fExternalUI.isRunning()

    def set_engine_about_to_close(self):
        return True

# ------------------------------------------------------------------------------------------------------------
# Main Window

class CarlaMiniW(ExternalUI, HostWindow):
    def __init__(self, host, parent=None):
        ExternalUI.__init__(self)
        HostWindow.__init__(self, host, sys.argv[0].lower().endswith("/carla-plugin-patchbay"), parent)
        self.host = host

        if False:
            # kdevelop likes this :)
            host = PluginHost()
            self.host = host

        host.setExternalUI(self)

        self.fFirstInit = True

        self.setWindowTitle(self.fUiName)
        self.ready()

    # Override this as it can be called from several places.
    # We really need to close all UIs as events are driven by host idle which is only available when UI is visible
    def closeExternalUI(self):
        for i in reversed(range(self.fPluginCount)):
            self.host.show_custom_ui(i, False)

        ExternalUI.closeExternalUI(self)

    # -------------------------------------------------------------------
    # ExternalUI Callbacks

    def uiShow(self):
        if self.parent() is not None:
            return
        self.show()

    def uiFocus(self):
        if self.parent() is not None:
            return

        self.setWindowState((self.windowState() & ~Qt.WindowMinimized) | Qt.WindowActive)
        self.show()

        self.raise_()
        self.activateWindow()

    def uiHide(self):
        if self.parent() is not None:
            return
        self.hide()

    def uiQuit(self):
        self.closeExternalUI()
        self.close()

        if self != gui:
            gui.close()

        # there might be other qt windows open which will block carla-plugin from quitting
        app.quit()

    def uiTitleChanged(self, uiTitle):
        self.setWindowTitle(uiTitle)

    # -------------------------------------------------------------------
    # Qt events

    def closeEvent(self, event):
        self.closeExternalUI()
        HostWindow.closeEvent(self, event)

        # there might be other qt windows open which will block carla-plugin from quitting
        app.quit()

    # -------------------------------------------------------------------
    # Custom callback

    def msgCallback(self, msg):
        try:
            self.msgCallback2(msg)
        except:
            print("msgCallback error, skipped for", msg)

    def msgCallback2(self, msg):
        msg = charPtrToString(msg)

        #if not msg:
            #return

        if msg.startswith("PEAKS_"):
            pluginId = int(msg.replace("PEAKS_", ""))
            in1, in2, out1, out2 = [float(i) for i in self.readlineblock().split(":")]
            self.host._set_peaks(pluginId, in1, in2, out1, out2)

        elif msg.startswith("PARAMVAL_"):
            pluginId, paramId = [int(i) for i in msg.replace("PARAMVAL_", "").split(":")]
            paramValue = float(self.readlineblock())
            if paramId < 0:
                self.host._set_internalValue(pluginId, paramId, paramValue)
            else:
                self.host._set_parameterValue(pluginId, paramId, paramValue)

        elif msg.startswith("ENGINE_CALLBACK_"):
            action   = int(msg.replace("ENGINE_CALLBACK_", ""))
            pluginId = int(self.readlineblock())
            value1   = int(self.readlineblock())
            value2   = int(self.readlineblock())
            value3   = float(self.readlineblock())
            valueStr = self.readlineblock().replace("\r", "\n")

            if action == ENGINE_CALLBACK_PLUGIN_RENAMED:
                self.host._set_pluginName(pluginId, valueStr)
            elif action == ENGINE_CALLBACK_PARAMETER_VALUE_CHANGED:
                if value1 < 0:
                    self.host._set_internalValue(pluginId, value1, value3)
                else:
                    self.host._set_parameterValue(pluginId, value1, value3)
            elif action == ENGINE_CALLBACK_PARAMETER_DEFAULT_CHANGED:
                self.host._set_parameterDefault(pluginId, value1, value3)
            elif action == ENGINE_CALLBACK_PARAMETER_MIDI_CC_CHANGED:
                self.host._set_parameterMidiCC(pluginId, value1, value2)
            elif action == ENGINE_CALLBACK_PARAMETER_MIDI_CHANNEL_CHANGED:
                self.host._set_parameterMidiChannel(pluginId, value1, value2)
            elif action == ENGINE_CALLBACK_PROGRAM_CHANGED:
                self.host._set_currentProgram(pluginId, value1)
            elif action == ENGINE_CALLBACK_MIDI_PROGRAM_CHANGED:
                self.host._set_currentMidiProgram(pluginId, value1)

            engineCallback(self.host, action, pluginId, value1, value2, value3, valueStr)

        elif msg.startswith("ENGINE_OPTION_"):
            option = int(msg.replace("ENGINE_OPTION_", ""))
            forced = bool(self.readlineblock() == "true")
            value  = self.readlineblock()

            if self.fFirstInit and not forced:
                return

            if option == ENGINE_OPTION_PROCESS_MODE:
                self.host.processMode = int(value)
            elif option == ENGINE_OPTION_TRANSPORT_MODE:
                self.host.transportMode = int(value)
            elif option == ENGINE_OPTION_FORCE_STEREO:
                self.host.forceStereo = bool(value == "true")
            elif option == ENGINE_OPTION_PREFER_PLUGIN_BRIDGES:
                self.host.preferPluginBridges = bool(value == "true")
            elif option == ENGINE_OPTION_PREFER_UI_BRIDGES:
                self.host.preferUIBridges = bool(value == "true")
            elif option == ENGINE_OPTION_UIS_ALWAYS_ON_TOP:
                self.host.uisAlwaysOnTop = bool(value == "true")
            elif option == ENGINE_OPTION_MAX_PARAMETERS:
                self.host.maxParameters = int(value)
            elif option == ENGINE_OPTION_UI_BRIDGES_TIMEOUT:
                self.host.uiBridgesTimeout = int(value)
            elif option == ENGINE_OPTION_PATH_BINARIES:
                self.host.pathBinaries = value
            elif option == ENGINE_OPTION_PATH_RESOURCES:
                self.host.pathResources = value

        elif msg.startswith("PLUGIN_INFO_"):
            pluginId = int(msg.replace("PLUGIN_INFO_", ""))
            self.host._add(pluginId)

            type_, category, hints, uniqueId, optsAvail, optsEnabled = [int(i) for i in self.readlineblock().split(":")]
            filename  = self.readlineblock().replace("\r", "\n")
            name      = self.readlineblock().replace("\r", "\n")
            iconName  = self.readlineblock().replace("\r", "\n")
            realName  = self.readlineblock().replace("\r", "\n")
            label     = self.readlineblock().replace("\r", "\n")
            maker     = self.readlineblock().replace("\r", "\n")
            copyright = self.readlineblock().replace("\r", "\n")

            pinfo = {
                'type': type_,
                'category': category,
                'hints': hints,
                'optionsAvailable': optsAvail,
                'optionsEnabled': optsEnabled,
                'filename': filename,
                'name':  name,
                'label': label,
                'maker': maker,
                'copyright': copyright,
                'iconName': iconName,
                'patchbayClientId': 0,
                'uniqueId': uniqueId
            }
            self.host._set_pluginInfo(pluginId, pinfo)
            self.host._set_pluginRealName(pluginId, realName)

        elif msg.startswith("AUDIO_COUNT_"):
            pluginId, ins, outs = [int(i) for i in msg.replace("AUDIO_COUNT_", "").split(":")]
            self.host._set_audioCountInfo(pluginId, {'ins': ins, 'outs': outs})

        elif msg.startswith("MIDI_COUNT_"):
            pluginId, ins, outs = [int(i) for i in msg.replace("MIDI_COUNT_", "").split(":")]
            self.host._set_midiCountInfo(pluginId, {'ins': ins, 'outs': outs})

        elif msg.startswith("PARAMETER_COUNT_"):
            pluginId, ins, outs, count = [int(i) for i in msg.replace("PARAMETER_COUNT_", "").split(":")]
            self.host._set_parameterCountInfo(pluginId, count, {'ins': ins, 'outs': outs})

        elif msg.startswith("PARAMETER_DATA_"):
            pluginId, paramId = [int(i) for i in msg.replace("PARAMETER_DATA_", "").split(":")]
            paramType, paramHints, midiChannel, midiCC = [int(i) for i in self.readlineblock().split(":")]
            paramName = self.readlineblock().replace("\r", "\n")
            paramUnit = self.readlineblock().replace("\r", "\n")

            paramInfo = {
                'name': paramName,
                'symbol': "",
                'unit': paramUnit,
                'scalePointCount': 0,
            }
            self.host._set_parameterInfo(pluginId, paramId, paramInfo)

            paramData = {
                'type': paramType,
                'hints': paramHints,
                'index': paramId,
                'rindex': -1,
                'midiCC': midiCC,
                'midiChannel': midiChannel
            }
            self.host._set_parameterData(pluginId, paramId, paramData)

        elif msg.startswith("PARAMETER_RANGES_"):
            pluginId, paramId = [int(i) for i in msg.replace("PARAMETER_RANGES_", "").split(":")]
            def_, min_, max_, step, stepSmall, stepLarge = [float(i) for i in self.readlineblock().split(":")]

            paramRanges = {
                'def': def_,
                'min': min_,
                'max': max_,
                'step': step,
                'stepSmall': stepSmall,
                'stepLarge': stepLarge
            }
            self.host._set_parameterRanges(pluginId, paramId, paramRanges)

        elif msg.startswith("PROGRAM_COUNT_"):
            pluginId, count, current = [int(i) for i in msg.replace("PROGRAM_COUNT_", "").split(":")]
            self.host._set_programCount(pluginId, count)
            self.host._set_currentProgram(pluginId, current)

        elif msg.startswith("PROGRAM_NAME_"):
            pluginId, progId = [int(i) for i in msg.replace("PROGRAM_NAME_", "").split(":")]
            progName = self.readlineblock().replace("\r", "\n")
            self.host._set_programName(pluginId, progId, progName)

        elif msg.startswith("MIDI_PROGRAM_COUNT_"):
            pluginId, count, current = [int(i) for i in msg.replace("MIDI_PROGRAM_COUNT_", "").split(":")]
            self.host._set_midiProgramCount(pluginId, count)
            self.host._set_currentMidiProgram(pluginId, current)

        elif msg.startswith("MIDI_PROGRAM_DATA_"):
            pluginId, midiProgId = [int(i) for i in msg.replace("MIDI_PROGRAM_DATA_", "").split(":")]
            bank, program = [int(i) for i in self.readlineblock().split(":")]
            name = self.readlineblock().replace("\r", "\n")
            self.host._set_midiProgramData(pluginId, midiProgId, {'bank': bank, 'program': program, 'name': name})

        elif msg.startswith("CUSTOM_DATA_COUNT_"):
            pluginId, count = [int(i) for i in msg.replace("CUSTOM_DATA_COUNT_", "").split(":")]
            self.host._set_customDataCount(pluginId, count)

        elif msg.startswith("CUSTOM_DATA_"):
            pluginId, customDataId = [int(i) for i in msg.replace("CUSTOM_DATA_", "").split(":")]

            type_ = self.readlineblock().replace("\r", "\n")
            key   = self.readlineblock().replace("\r", "\n")
            value = self.readlineblock().replace("\r", "\n")
            self.host._set_customData(pluginId, customDataId, {'type': type_, 'key': key, 'value': value})

        elif msg == "osc-urls":
            tcp = self.readlineblock().replace("\r", "\n")
            udp = self.readlineblock().replace("\r", "\n")
            self.host.fOscTCP = tcp
            self.host.fOscUDP = udp

        elif msg == "max-plugin-number":
            maxnum = int(self.readlineblock())
            self.host.fMaxPluginNumber = maxnum

        elif msg == "buffer-size":
            bufsize = int(self.readlineblock())
            self.host.fBufferSize = bufsize

        elif msg == "sample-rate":
            srate = float(self.readlineblock())
            self.host.fSampleRate = srate

        elif msg == "transport":
            playing = bool(self.readlineblock() == "true")
            frame, bar, beat, tick = [int(i) for i in self.readlineblock().split(":")]
            bpm = float(self.readlineblock())
            self.host._set_transport(playing, frame, bar, beat, tick, bpm)

        elif msg == "error":
            error = self.readlineblock().replace("\r", "\n")
            engineCallback(self.host, ENGINE_CALLBACK_ERROR, 0, 0, 0, 0.0, error)

        elif msg == "show":
            self.fFirstInit = False
            self.uiShow()

        elif msg == "focus":
            self.uiFocus()

        elif msg == "hide":
            self.uiHide()

        elif msg == "quit":
            self.fQuitReceived = True
            self.uiQuit()

        elif msg == "uiTitle":
            uiTitle = self.readlineblock().replace("\r", "\n")
            self.uiTitleChanged(uiTitle)

        else:
            print("unknown message: \"" + msg + "\"")

# ------------------------------------------------------------------------------------------------------------
# Embed Widget

if config_UseQt5 and LINUX:
    from PyQt5.QtGui import QMouseEvent

    class QEmbedWidget(QWidget):
        def __init__(self, winId):
            QWidget.__init__(self)
            self.setAttribute(Qt.WA_LayoutUsesWidgetRect)
            self.move(0, 0)

            self.fPos = (0, 0)
            self.fWinId = 0

        def getWidget(self):
            return self

        def finalSetup(self, gui, winId):
            self.fWinId = int(self.winId())
            gui.ui.centralwidget.installEventFilter(self)
            gui.ui.menubar.installEventFilter(self)
            gCarla.utils.x11_reparent_window(self.fWinId, winId)
            self.show()

        def fixPosition(self):
            pos = gCarla.utils.x11_get_window_pos(self.fWinId)
            if self.fPos == pos:
                return
            self.fPos = pos
            self.move(pos[0], pos[1])
            gCarla.utils.x11_move_window(self.fWinId, 0, 0)

        def eventFilter(self, obj, ev):
            if isinstance(ev, QMouseEvent):
                self.fixPosition()
            return False

        def enterEvent(self, ev):
            self.fixPosition()
            QWidget.enterEvent(self, ev)

elif config_UseQt5 and not LINUX:
    from PyQt5.QtGui import QWindow

    class QEmbedWidget(object):
        def __init__(self, winId):
            self.fWindow = QWindow.fromWinId(winId)
            self.fWidget = QWidget.createWindowContainer(self.fWindow)
            self.fWidget.setAttribute(Qt.WA_LayoutUsesWidgetRect)

            # TODO: show/hide/close events

        def getWidget(self):
            return self.fWidget

        def finalSetup(self, gui, winId):
            self.fWidget.show()

elif not config_UseQt5 and LINUX:
    from PyQt4.QtGui import QX11EmbedWidget

    class QEmbedWidget(QX11EmbedWidget):
        def __init__(self, winId):
            QX11EmbedWidget.__init__(self)

        def getWidget(self):
            return self

        def finalSetup(self, gui, winId):
            self.embedInto(winId)
            self.show()

else:
    class QEmbedWidget(object):
        def __init__(self, winId):
            print("Cannot use embed UI with this configuration")
            raise Exception

# ------------------------------------------------------------------------------------------------------------
# Embed plugin UI

class CarlaEmbedW(QEmbedWidget):
    def __init__(self, host, winId):
        QEmbedWidget.__init__(self, winId)

        self.host = host
        self.fWinId = winId
        self.fWidget = self.getWidget()
        self.fWidget.setFixedSize(740, 512)

        self.fLayout = QVBoxLayout(self.fWidget)
        self.fLayout.setContentsMargins(0, 0, 0, 0)
        self.fLayout.setSpacing(0)
        self.fWidget.setLayout(self.fLayout)

        self.gui = CarlaMiniW(host, self.fWidget)
        self.gui.hide()

        self.gui.ui.act_file_quit.setEnabled(False)
        self.gui.ui.act_file_quit.setVisible(False)

        self.fShortcutActions = []
        self.addShortcutActions(self.gui.ui.menu_File.actions())
        self.addShortcutActions(self.gui.ui.menu_Plugin.actions())
        self.addShortcutActions(self.gui.ui.menu_PluginMacros.actions())
        self.addShortcutActions(self.gui.ui.menu_Settings.actions())
        self.addShortcutActions(self.gui.ui.menu_Help.actions())

        if self.host.processMode == ENGINE_PROCESS_MODE_PATCHBAY:
            self.addShortcutActions(self.gui.ui.menu_Canvas.actions())
            self.addShortcutActions(self.gui.ui.menu_Canvas_Zoom.actions())

        self.addWidget(self.gui.ui.menubar)
        self.addLine()
        self.addWidget(self.gui.ui.toolBar)

        if self.host.processMode == ENGINE_PROCESS_MODE_PATCHBAY:
            self.addLine()

        self.addWidget(self.gui.centralWidget())
        self.finalSetup(self.gui, winId)

        self.gui.send(["ready", int(self.fWidget.winId())])

    def addShortcutActions(self, actions):
        for action in actions:
            if not action.shortcut().isEmpty():
                self.fShortcutActions.append(action)

    def addWidget(self, widget):
        widget.setParent(self.fWidget)
        self.fLayout.addWidget(widget)

    def addLine(self):
        line = QFrame(self.fWidget)
        line.setFrameShadow(QFrame.Sunken)
        line.setFrameShape(QFrame.HLine)
        line.setLineWidth(0)
        line.setMidLineWidth(1)
        self.fLayout.addWidget(line)

    def keyPressEvent(self, event):
        modifiers    = event.modifiers()
        modifiersStr = ""

        if modifiers & Qt.ShiftModifier:
            modifiersStr += "Shift+"
        if modifiers & Qt.ControlModifier:
            modifiersStr += "Ctrl+"
        if modifiers & Qt.AltModifier:
            modifiersStr += "Alt+"
        if modifiers & Qt.MetaModifier:
            modifiersStr += "Meta+"

        keyStr = QKeySequence(event.key()).toString()
        keySeq = QKeySequence(modifiersStr + keyStr)

        for action in self.fShortcutActions:
            if not action.isEnabled():
                continue
            if keySeq.matches(action.shortcut()) != QKeySequence.ExactMatch:
                continue
            event.accept()
            action.trigger()
            return

        QEmbedWidget.keyPressEvent(self, event)

    def showEvent(self, event):
        QEmbedWidget.showEvent(self, event)

        # set our gui as parent for all plugins UIs
        if self.host.manageUIs:
            winIdStr = "%x" % self.fWinId
            self.host.set_engine_option(ENGINE_OPTION_FRONTEND_WIN_ID, 0, winIdStr)

    def hideEvent(self, event):
        # disable parent
        self.host.set_engine_option(ENGINE_OPTION_FRONTEND_WIN_ID, 0, "0")

        QEmbedWidget.hideEvent(self, event)

    def closeEvent(self, event):
        self.gui.close()
        self.gui.closeExternalUI()
        QEmbedWidget.closeEvent(self, event)

        # there might be other qt windows open which will block carla-plugin from quitting
        app.quit()

# ------------------------------------------------------------------------------------------------------------
# Main

if __name__ == '__main__':
    # -------------------------------------------------------------
    # App initialization

    app = CarlaApplication("Carla2-Plugin")

    # -------------------------------------------------------------
    # Set-up custom signal handling

    setUpSignals()

    # -------------------------------------------------------------
    # Init host backend

    host = initHost("Carla-Plugin", None, False, True, True, PluginHost)
    host.processMode       = ENGINE_PROCESS_MODE_PATCHBAY if sys.argv[0].lower().endswith("/carla-plugin-patchbay") else ENGINE_PROCESS_MODE_CONTINUOUS_RACK
    host.processModeForced = True
    host.nextProcessMode   = host.processMode
    loadHostSettings(host)

    # -------------------------------------------------------------
    # Create GUI

    try:
        winId = int(os.getenv("CARLA_PLUGIN_EMBED_WINID"))
    except:
        winId = 0

    gCarla.utils.setenv("CARLA_PLUGIN_EMBED_WINID", "0")

    if LINUX and winId != 0:
        gui = CarlaEmbedW(host, winId)
    else:
        gui = CarlaMiniW(host)

    # -------------------------------------------------------------
    # App-Loop

    app.exit_exec()