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

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

# Carla plugin host (plugin UI)
# Copyright (C) 2013-2014 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 (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

        self.fExternalUI.send(lines)
        return True

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

    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

# ------------------------------------------------------------------------------------------------------------
# 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()

    # -------------------------------------------------------------------
    # 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()

        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 plugin UI

if LINUX and not config_UseQt5:
    from PyQt4.QtGui import QHBoxLayout, QKeySequence, QX11EmbedWidget

    class CarlaEmbedW(QX11EmbedWidget):
        def __init__(self, host, winId):
            QX11EmbedWidget.__init__(self)
            self.host = host

            self.fWinId = winId

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

            self.gui = CarlaMiniW(host, self)
            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.setFixedSize(740, 512)
            self.embedInto(winId)
            self.show()

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

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

        def addLine(self):
            line = QFrame(self)
            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

            QX11EmbedWidget.keyPressEvent(self, event)

        def showEvent(self, event):
            QX11EmbedWidget.showEvent(self, event)

            # set our gui as parent for all plugins UIs
            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")

            QX11EmbedWidget.hideEvent(self, event)

        def closeEvent(self, event):
            self.gui.close()
            self.gui.closeExternalUI()
            QX11EmbedWidget.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 and not config_UseQt5:
        gui = CarlaEmbedW(host, winId)
    else:
        gui = CarlaMiniW(host)

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

    app.exit_exec()