Carla/source/carla_backend.py

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

# Carla Backend code
# Copyright (C) 2011-2013 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 doc/GPL.txt file.

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

from ctypes import *
from platform import architecture
from sys import platform, maxsize

# ------------------------------------------------------------------------------------------------------------
# 64bit check

kIs64bit = bool(architecture()[0] == "64bit" and maxsize > 2**32)

# ------------------------------------------------------------------------------------------------------------
# Define enum type (integer)

c_enum = c_int

# ------------------------------------------------------------------------------------------------------------
# Set Platform

if platform == "darwin":
    HAIKU   = False
    LINUX   = False
    MACOS   = True
    WINDOWS = False
elif "haiku" in platform:
    HAIKU   = True
    LINUX   = False
    MACOS   = False
    WINDOWS = False
elif "linux" in platform:
    HAIKU   = False
    LINUX   = True
    MACOS   = False
    WINDOWS = False
elif platform in ("win32", "win64", "cygwin"):
    HAIKU   = False
    LINUX   = False
    MACOS   = False
    WINDOWS = True
else:
    HAIKU   = False
    LINUX   = False
    MACOS   = False
    WINDOWS = False

# ------------------------------------------------------------------------------------------------------------
# Convert a ctypes c_char_p into a python string

def charPtrToString(value):
    if not value:
        return ""
    if isinstance(value, str):
        return value
    return value.decode("utf-8", errors="ignore")

# ------------------------------------------------------------------------------------------------------------
# Convert a ctypes POINTER(c_char_p) into a python string list

def charPtrPtrToStringList(charPtrPtr):
    if not charPtrPtr:
        return []

    i       = 0
    charPtr = charPtrPtr[0]
    strList = []

    while charPtr:
        strList.append(charPtr.decode("utf-8", errors="ignore"))

        i += 1
        charPtr = charPtrPtr[i]

    return strList

# ------------------------------------------------------------------------------------------------------------
# Convert a ctypes POINTER(c_<num>) into a python number list

def numPtrToList(numPtr):
    if not numPtr:
        return []

    i       = 0
    num     = numPtr[0].value
    numList = []

    while num not in (0, 0.0):
        numList.append(num)

        i += 1
        num = numPtr[i].value

    return numList

# ------------------------------------------------------------------------------------------------------------
# Convert a ctypes struct into a python dict

def structToDict(struct):
    return dict((attr, getattr(struct, attr)) for attr, value in struct._fields_)

# ------------------------------------------------------------------------------------------------------------
# Carla Backend API (base definitions)

# Maximum default number of loadable plugins.
MAX_DEFAULT_PLUGINS = 99

# Maximum number of loadable plugins in rack mode.
MAX_RACK_PLUGINS = 16

# Maximum number of loadable plugins in patchbay mode.
MAX_PATCHBAY_PLUGINS = 255

# Maximum default number of parameters allowed.
# @see ENGINE_OPTION_MAX_PARAMETERS
MAX_DEFAULT_PARAMETERS = 200

# ------------------------------------------------------------------------------------------------------------
# Engine Driver Device Hints
# Various engine driver device hints.
# @see carla_get_engine_driver_device_info()

# Engine driver device has custom control-panel.
ENGINE_DRIVER_DEVICE_HAS_CONTROL_PANEL = 0x1

# Engine driver device can change buffer-size on the fly.
# @see ENGINE_OPTION_AUDIO_BUFFER_SIZE
ENGINE_DRIVER_DEVICE_VARIABLE_BUFFER_SIZE = 0x2

# Engine driver device can change sample-rate on the fly.
# @see ENGINE_OPTION_AUDIO_SAMPLE_RATE
ENGINE_DRIVER_DEVICE_VARIABLE_SAMPLE_RATE = 0x4

# ------------------------------------------------------------------------------------------------------------
# Plugin Hints
# Various plugin hints.
# @see carla_get_plugin_info()

# Plugin is a bridge.
# This hint is required because "bridge" itself is not a plugin type.
PLUGIN_IS_BRIDGE = 0x001

# Plugin is hard real-time safe.
PLUGIN_IS_RTSAFE = 0x002

# Plugin is a synth (produces sound).
PLUGIN_IS_SYNTH = 0x004

# Plugin has its own custom UI.
# @see carla_show_custom_ui()
PLUGIN_HAS_CUSTOM_UI = 0x008

# Plugin can use internal Dry/Wet control.
PLUGIN_CAN_DRYWET = 0x010

# Plugin can use internal Volume control.
PLUGIN_CAN_VOLUME = 0x020

# Plugin can use internal (Stereo) Balance controls.
PLUGIN_CAN_BALANCE = 0x040

# Plugin can use internal (Mono) Panning control.
PLUGIN_CAN_PANNING = 0x080

# Plugin needs a constant, fixed-size audio buffer.
PLUGIN_NEEDS_FIXED_BUFFERS = 0x100

# Plugin needs all UI events in a single/main thread.
PLUGIN_NEEDS_SINGLE_THREAD = 0x200

# ------------------------------------------------------------------------------------------------------------
# Plugin Options
# Various plugin options.
# @see carla_get_plugin_info() and carla_set_option()

# Use constant/fixed-size audio buffers.
PLUGIN_OPTION_FIXED_BUFFERS = 0x001

# Force mono plugin as stereo.
PLUGIN_OPTION_FORCE_STEREO = 0x002

# Map MIDI programs to plugin programs.
PLUGIN_OPTION_MAP_PROGRAM_CHANGES = 0x004

# Use chunks to save and restore data.
PLUGIN_OPTION_USE_CHUNKS = 0x008

# Send MIDI control change events.
PLUGIN_OPTION_SEND_CONTROL_CHANGES = 0x010

# Send MIDI channel pressure events.
PLUGIN_OPTION_SEND_CHANNEL_PRESSURE = 0x020

# Send MIDI note after-touch events.
PLUGIN_OPTION_SEND_NOTE_AFTERTOUCH = 0x040

# Send MIDI pitch-bend events.
PLUGIN_OPTION_SEND_PITCHBEND = 0x080

# Send MIDI all-sounds/notes-off events, single note-offs otherwise.
PLUGIN_OPTION_SEND_ALL_SOUND_OFF = 0x100

# ------------------------------------------------------------------------------------------------------------
# Parameter Hints
# Various parameter hints.
# @see CarlaPlugin::getParameterData() and carla_get_parameter_data()

# Parameter is input.
# When this hint is not set, parameter is assumed to be output.
PARAMETER_IS_INPUT = 0x001

# Parameter value is boolean.
PARAMETER_IS_BOOLEAN = 0x002

# Parameter value is integer.
PARAMETER_IS_INTEGER = 0x004

# Parameter value is logarithmic.
PARAMETER_IS_LOGARITHMIC = 0x008

# Parameter is enabled.
# It can be viewed, changed and stored.
PARAMETER_IS_ENABLED = 0x010

# Parameter is automable (real-time safe).
PARAMETER_IS_AUTOMABLE = 0x020

# Parameter is read-only.
# It cannot be changed.
PARAMETER_IS_READ_ONLY = 0x040

# Parameter needs sample rate to work.
# Value and ranges are multiplied by sample rate on usage and divided by sample rate on save.
PARAMETER_USES_SAMPLERATE = 0x100

# Parameter uses scale points to define internal values in a meaningful way.
PARAMETER_USES_SCALEPOINTS = 0x200

# Parameter uses custom text for displaying its value.
# @see carla_get_parameter_text()
PARAMETER_USES_CUSTOM_TEXT = 0x400

# ------------------------------------------------------------------------------------------------------------
# Patchbay Port Hints
# Various patchbay port hints.

# Patchbay port is input.
# When this hint is not set, port is assumed to be output.
PATCHBAY_PORT_IS_INPUT = 0x1

# Patchbay port is of Audio type.
PATCHBAY_PORT_TYPE_AUDIO = 0x2

# Patchbay port is of CV type (Control Voltage).
PATCHBAY_PORT_TYPE_CV = 0x4

# Patchbay port is of MIDI type.
PATCHBAY_PORT_TYPE_MIDI = 0x8

# ------------------------------------------------------------------------------------------------------------
# Custom Data Types
# These types define how the value in the CustomData struct is stored.
# @see CustomData.type

# Boolean string type URI.
# Only "true" and "false" are valid values.
CUSTOM_DATA_TYPE_BOOLEAN = "http://kxstudio.sf.net/ns/carla/boolean"

# Chunk type URI.
CUSTOM_DATA_TYPE_CHUNK = "http://kxstudio.sf.net/ns/carla/chunk"

# String type URI.
CUSTOM_DATA_TYPE_STRING = "http://kxstudio.sf.net/ns/carla/string"

# ------------------------------------------------------------------------------------------------------------
# Custom Data Keys
# Pre-defined keys used internally in Carla.
# @see CustomData.key

# Plugin options key.
CUSTOM_DATA_KEY_PLUGIN_OPTIONS = "CarlaPluginOptions"

# UI position key.
CUSTOM_DATA_KEY_UI_POSITION = "CarlaUiPosition"

# UI size key.
CUSTOM_DATA_KEY_UI_SIZE = "CarlaUiSize"

# UI visible key.
CUSTOM_DATA_KEY_UI_VISIBLE = "CarlaUiVisible"

# ------------------------------------------------------------------------------------------------------------
# Binary Type
# The binary type of a plugin.

# Null binary type.
BINARY_NONE = 0

# POSIX 32bit binary.
BINARY_POSIX32 = 1

# POSIX 64bit binary.
BINARY_POSIX64 = 2

# Windows 32bit binary.
BINARY_WIN32 = 3

# Windows 64bit binary.
BINARY_WIN64 = 4

# Other binary type.
BINARY_OTHER = 5

# ------------------------------------------------------------------------------------------------------------
# Plugin Type
# Plugin type.
# Some files are handled as if they were plugins.

# Null plugin type.
PLUGIN_NONE = 0

# Internal plugin.
PLUGIN_INTERNAL = 1

# LADSPA plugin.
PLUGIN_LADSPA = 2

# DSSI plugin.
PLUGIN_DSSI = 3

# LV2 plugin.
PLUGIN_LV2 = 4

# VST plugin.
PLUGIN_VST = 5

# AU plugin.
# @note MacOS only
PLUGIN_AU = 6

# Csound file.
PLUGIN_CSOUND = 7

# GIG file.
PLUGIN_GIG = 8

# SF2 file (also known as SoundFont).
PLUGIN_SF2 = 9

# SFZ file.
PLUGIN_SFZ = 10

# ------------------------------------------------------------------------------------------------------------
# Plugin Category
# Plugin category, which describes the functionality of a plugin.

# Null plugin category.
PLUGIN_CATEGORY_NONE = 0

# A synthesizer or generator.
PLUGIN_CATEGORY_SYNTH = 1

# A delay or reverb.
PLUGIN_CATEGORY_DELAY = 2

# An equalizer.
PLUGIN_CATEGORY_EQ = 3

# A filter.
PLUGIN_CATEGORY_FILTER = 4

# A distortion plugin.
PLUGIN_CATEGORY_DISTORTION = 5

# A 'dynamic' plugin (amplifier, compressor, gate, etc).
PLUGIN_CATEGORY_DYNAMICS = 6

# A 'modulator' plugin (chorus, flanger, phaser, etc).
PLUGIN_CATEGORY_MODULATOR = 7

# An 'utility' plugin (analyzer, converter, mixer, etc).
PLUGIN_CATEGORY_UTILITY = 8

# Miscellaneous plugin (used to check if the plugin has a category).
PLUGIN_CATEGORY_OTHER = 9

# ------------------------------------------------------------------------------------------------------------
# Parameter Type
# Plugin parameter type.

# Null parameter type.
PARAMETER_UNKNOWN = 0

# Input parameter.
PARAMETER_INPUT = 1

# Ouput parameter.
PARAMETER_OUTPUT = 2

# Special (hidden) parameter.
PARAMETER_SPECIAL = 3

# ------------------------------------------------------------------------------------------------------------
# Internal Parameter Index
# Special parameters used internally in Carla.
# Plugins do not know about their existence.

# Null parameter.
PARAMETER_NULL = -1

# Active parameter, boolean type.
# Default is 'false'.
PARAMETER_ACTIVE = -2

# Dry/Wet parameter.
# Range 0.0...1.0; default is 1.0.
PARAMETER_DRYWET = -3

# Volume parameter.
# Range 0.0...1.27; default is 1.0.
PARAMETER_VOLUME = -4

# Stereo Balance-Left parameter.
# Range -1.0...1.0; default is -1.0.
PARAMETER_BALANCE_LEFT = -5

# Stereo Balance-Right parameter.
# Range -1.0...1.0; default is 1.0.
PARAMETER_BALANCE_RIGHT = -6

# Mono Panning parameter.
# Range -1.0...1.0; default is 0.0.
PARAMETER_PANNING = -7

# MIDI Control channel, integer type.
# Range -1...15 (-1 = off).
PARAMETER_CTRL_CHANNEL = -8

# Max value, defined only for convenience.
PARAMETER_MAX = -9

# ------------------------------------------------------------------------------------------------------------
# Engine Callback Opcode
# Engine callback opcodes.
# Front-ends must never block indefinitely during a callback.
# @see EngineCallbackFunc and carla_set_engine_callback()

# Debug.
# This opcode is undefined and used only for testing purposes.
ENGINE_CALLBACK_DEBUG = 0

# A plugin has been added.
# @param pluginId Plugin Id
# @param valueStr Plugin name
ENGINE_CALLBACK_PLUGIN_ADDED = 1

# A plugin has been removed.
# @param pluginId Plugin Id
ENGINE_CALLBACK_PLUGIN_REMOVED = 2

# A plugin has been renamed.
# @param pluginId Plugin Id
# @param valueStr New plugin name
ENGINE_CALLBACK_PLUGIN_RENAMED = 3

# A plugin has become unavailable.
# @param pluginId Plugin Id
# @param valueStr Related error string
ENGINE_CALLBACK_PLUGIN_UNAVAILABLE = 4

# A parameter value has changed.
# @param pluginId Plugin Id
# @param value1   Parameter index
# @param value3   New parameter value
ENGINE_CALLBACK_PARAMETER_VALUE_CHANGED = 5

# A parameter default has changed.
# @param pluginId Plugin Id
# @param value1   Parameter index
# @param value3   New default value
ENGINE_CALLBACK_PARAMETER_DEFAULT_CHANGED = 6

# A parameter's MIDI CC has changed.
# @param pluginId Plugin Id
# @param value1   Parameter index
# @param value2   New MIDI CC
ENGINE_CALLBACK_PARAMETER_MIDI_CC_CHANGED = 7

# A parameter's MIDI channel has changed.
# @param pluginId Plugin Id
# @param value1   Parameter index
# @param value2   New MIDI channel
ENGINE_CALLBACK_PARAMETER_MIDI_CHANNEL_CHANGED = 8

# The current program of a plugin has changed.
# @param pluginId Plugin Id
# @param value1   New program index
ENGINE_CALLBACK_PROGRAM_CHANGED = 9

# The current MIDI program of a plugin has changed.
# @param pluginId Plugin Id
# @param value1   New MIDI bank
# @param value2   New MIDI program
ENGINE_CALLBACK_MIDI_PROGRAM_CHANGED = 10

# A plugin's custom UI state has changed.
# @param pluginId Plugin Id
# @param value1   New state, as follows:
#                  0: UI is now hidden
#                  1: UI is now visible
#                 -1: UI has crashed and should not be shown again
ENGINE_CALLBACK_UI_STATE_CHANGED = 11

# A note has been pressed.
# @param pluginId Plugin Id
# @param value1   Channel
# @param value2   Note
# @param value3   Velocity
ENGINE_CALLBACK_NOTE_ON = 12

# A note has been released.
# @param pluginId Plugin Id
# @param value1   Channel
# @param value2   Note
ENGINE_CALLBACK_NOTE_OFF = 13

# A plugin needs update.
# @param pluginId Plugin Id
ENGINE_CALLBACK_UPDATE = 14

# A plugin's data/information has changed.
# @param pluginId Plugin Id
ENGINE_CALLBACK_RELOAD_INFO = 15

# A plugin's parameters have changed.
# @param pluginId Plugin Id
ENGINE_CALLBACK_RELOAD_PARAMETERS = 16

# A plugin's programs have changed.
# @param pluginId Plugin Id
ENGINE_CALLBACK_RELOAD_PROGRAMS = 17

# A plugin state has changed.
# @param pluginId Plugin Id
ENGINE_CALLBACK_RELOAD_ALL = 18

# A patchbay client has been added.
# @param pluginId Client Id
# @param valueStr Client name and icon, as "name:icon"
ENGINE_CALLBACK_PATCHBAY_CLIENT_ADDED = 19

# A patchbay client has been removed.
# @param pluginId Client Id
ENGINE_CALLBACK_PATCHBAY_CLIENT_REMOVED = 20

# A patchbay client has been renamed.
# @param pluginId Client Id
# @param valueStr New client name
ENGINE_CALLBACK_PATCHBAY_CLIENT_RENAMED = 21

# A patchbay client icon has changed.
# @param pluginId Client Id
# @param valueStr New icon name
ENGINE_CALLBACK_PATCHBAY_CLIENT_ICON_CHANGED = 22

# A patchbay port has been added.
# @param pluginId Client Id
# @param value1   Port Id
# @param value2   Port hints
# @param valueStr Port name
# @see PatchbayPortHints
ENGINE_CALLBACK_PATCHBAY_PORT_ADDED = 23

# A patchbay port has been removed.
# @param pluginId Client Id
# @param value1   Port Id
ENGINE_CALLBACK_PATCHBAY_PORT_REMOVED = 24

# A patchbay port has been renamed.
# @param pluginId Client Id
# @param value1   Port Id
# @param valueStr New port name
ENGINE_CALLBACK_PATCHBAY_PORT_RENAMED = 25

# A patchbay connection has been added.
# @param value1 Output port Id
# @param value2 Input port Id
ENGINE_CALLBACK_PATCHBAY_CONNECTION_ADDED = 26

# A patchbay connection has been removed.
# @param value1 Output port Id
# @param value2 Input port Id
ENGINE_CALLBACK_PATCHBAY_CONNECTION_REMOVED = 27

# Engine started.
# @param value1   Process mode
# @param value2   Transport mode
# @param valuestr Engine driver
# @see EngineProcessMode
# @see EngineTransportMode
ENGINE_CALLBACK_ENGINE_STARTED = 28

# Engine stopped.
ENGINE_CALLBACK_ENGINE_STOPPED = 29

# Engine process mode has changed.
# @param value1 New process mode
# @see EngineProcessMode
ENGINE_CALLBACK_PROCESS_MODE_CHANGED = 30

# Engine transport mode has changed.
# @param value1 New transport mode
# @see EngineTransportMode
ENGINE_CALLBACK_TRANSPORT_MODE_CHANGED = 31

# Engine buffer-size changed.
# @param value1 New buffer size
ENGINE_CALLBACK_BUFFER_SIZE_CHANGED = 32

# Engine sample-rate changed.
# @param value3 New sample rate
ENGINE_CALLBACK_SAMPLE_RATE_CHANGED = 33

# Show a message as information.
# @param valueStr The message
ENGINE_CALLBACK_INFO = 34

# Show a message as an error.
# @param valueStr The message
ENGINE_CALLBACK_ERROR = 35

# The engine has crashed or malfunctioned and will no longer work.
ENGINE_CALLBACK_QUIT = 36

# ------------------------------------------------------------------------------------------------------------
# Engine Option
# Engine options.
# @see carla_set_engine_option()

# Debug.
# This option is undefined and used only for testing purposes.
ENGINE_OPTION_DEBUG = 0

# Set the engine processing mode.
# Default is ENGINE_PROCESS_MODE_MULTIPLE_CLIENTS on Linux and ENGINE_PROCESS_MODE_CONTINUOUS_RACK for all other OSes.
# @see EngineProcessMode
ENGINE_OPTION_PROCESS_MODE = 1

# Set the engine transport mode.
# Default is ENGINE_TRANSPORT_MODE_JACK on Linux and ENGINE_TRANSPORT_MODE_INTERNAL for all other OSes.
# @see EngineTransportMode
ENGINE_OPTION_TRANSPORT_MODE = 2

# Force mono plugins as stereo, by running 2 instances at the same time.
# Default is false, but always true when process mode is ENGINE_PROCESS_MODE_CONTINUOUS_RACK.
# @note Not supported by all plugins
# @see PLUGIN_OPTION_FORCE_STEREO
ENGINE_OPTION_FORCE_STEREO = 3

# Use plugin bridges whenever possible.
# Default is no, EXPERIMENTAL.
ENGINE_OPTION_PREFER_PLUGIN_BRIDGES = 4

# Use UI bridges whenever possible, otherwise UIs will be directly handled in the main backend thread.
# Default is yes.
ENGINE_OPTION_PREFER_UI_BRIDGES = 5

# Make custom plugin UIs always-on-top.
# Default is yes.
ENGINE_OPTION_UIS_ALWAYS_ON_TOP = 6

# Maximum number of parameters allowed.
# Default is MAX_DEFAULT_PARAMETERS.
ENGINE_OPTION_MAX_PARAMETERS = 7

# Timeout value for how much to wait for UI bridges to respond, in milliseconds.
# Default is 4000 (4 seconds).
ENGINE_OPTION_UI_BRIDGES_TIMEOUT = 8

# Audio number of periods.
# Default is 2.
ENGINE_OPTION_AUDIO_NUM_PERIODS = 9

# Audio buffer size.
# Default is 512.
ENGINE_OPTION_AUDIO_BUFFER_SIZE = 10

# Audio sample rate.
# Default is 44100.
ENGINE_OPTION_AUDIO_SAMPLE_RATE = 11

# Audio device (within a driver).
# Default unset.
ENGINE_OPTION_AUDIO_DEVICE = 12

# Set path to the binary files.
# Default unset.
# @note Must be set for plugin and UI bridges to work
ENGINE_OPTION_PATH_BINARIES = 13

# Set path to the resource files.
# Default unset.
# @note Must be set for some internal plugins to work
ENGINE_OPTION_PATH_RESOURCES = 14

# ------------------------------------------------------------------------------------------------------------
# Engine Process Mode
# Engine process mode.
# @see ENGINE_OPTION_PROCESS_MODE

# Single client mode.
# Inputs and outputs are added dynamically as needed by plugins.
ENGINE_PROCESS_MODE_SINGLE_CLIENT = 0

# Multiple client mode.
# It has 1 master client + 1 client per plugin.
ENGINE_PROCESS_MODE_MULTIPLE_CLIENTS = 1

# Single client, 'rack' mode.
# Processes plugins in order of Id, with forced stereo always on.
ENGINE_PROCESS_MODE_CONTINUOUS_RACK = 2

# Single client, 'patchbay' mode.
ENGINE_PROCESS_MODE_PATCHBAY = 3

# Special mode, used in plugin-bridges only.
ENGINE_PROCESS_MODE_BRIDGE = 4

# ------------------------------------------------------------------------------------------------------------
# Engine Transport Mode
# Engine transport mode.
# @see ENGINE_OPTION_TRANSPORT_MODE

# Internal transport mode.
ENGINE_TRANSPORT_MODE_INTERNAL = 0

# Transport from JACK.
# Only available if driver name is "JACK".
ENGINE_TRANSPORT_MODE_JACK = 1

# Transport from host, used when Carla is a plugin.
ENGINE_TRANSPORT_MODE_PLUGIN = 2

# Special mode, used in plugin-bridges only.
ENGINE_TRANSPORT_MODE_BRIDGE = 3

# ------------------------------------------------------------------------------------------------------------
# Carla Backend API (C stuff)

# Engine callback function.
# Front-ends must never block indefinitely during a callback.
# @see EngineCallbackOpcode and carla_set_engine_callback()
EngineCallbackFunc = CFUNCTYPE(None, c_void_p, c_enum, c_uint, c_int, c_int, c_float, c_char_p)

# Parameter data.
class ParameterData(Structure):
    _fields_ = [
        # This parameter type.
        ("type", c_enum),

        # This parameter hints.
        # @see ParameterHints
        ("hints", c_uint),

        # Index as seen by Carla.
        ("index", c_int32),

        # Real index as seen by plugins.
        ("rindex", c_int32),

        # Currently mapped MIDI CC.
        # A value lower than 0 means invalid or unused.
        # Maximum allowed value is 95 (0x5F).
        ("midiCC", c_int16),

        # Currently mapped MIDI channel.
        # Counts from 0 to 15.
        ("midiChannel", c_uint8)
    ]

# Parameter ranges.
class ParameterRanges(Structure):
    _fields_ = [
        # Default value.
        ("def", c_float),

        # Minimum value.
        ("min", c_float),

        # Maximum value.
        ("max", c_float),

        # Regular, single step value.
        ("step", c_float),

        # Small step value.
        ("stepSmall", c_float),

        # Large step value.
        ("stepLarge", c_float)
    ]

# MIDI Program data.
class MidiProgramData(Structure):
    _fields_ = [
        # MIDI bank.
        ("bank", c_uint32),

        # MIDI program.
        ("program", c_uint32),

        # MIDI program name.
        ("name", c_char_p)
    ]

# Custom data, used for saving key:value 'dictionaries'.
class CustomData(Structure):
    _fields_ = [
        # Value type, in URI form.
        # @see CustomDataTypes
        ("type", c_char_p),

        # Key.
        # @see CustomDataKeys
        ("key", c_char_p),

        # Value.
        ("value", c_char_p)
    ]

# Engine driver device information.
class EngineDriverDeviceInfo(Structure):
    _fields_ = [
        # This driver device hints.
        # @see EngineDriverHints
        ("hints", c_uint),

        # Available buffer sizes.
        # Terminated with 0.
        ("bufferSizes", POINTER(c_uint32)),

        # Available sample rates.
        # Terminated with 0.0.
        ("sampleRates", POINTER(c_double))
    ]

# ------------------------------------------------------------------------------------------------------------
# Carla Backend API (Python compatible stuff)

# @see ParameterData
PyParameterData = {
    'type': PARAMETER_UNKNOWN,
    'hints': 0x0,
    'index': PARAMETER_NULL,
    'rindex': -1,
    'midiCC': -1,
    'midiChannel': 0
}

# @see ParameterRanges
PyParameterRanges = {
    'def': 0.0,
    'min': 0.0,
    'max': 1.0,
    'step': 0.01,
    'stepSmall': 0.0001,
    'stepLarge': 0.1
}

# @see MidiProgramData
PyMidiProgramData = {
    'bank': 0,
    'program': 0,
    'name': None
}

# @see CustomData
PyCustomData = {
    'type': None,
    'key': None,
    'value': None
}

# @see EngineDriverDeviceInfo
PyEngineDriverDeviceInfo = {
    'hints': 0x0,
    'bufferSizes': [],
    'sampleRates': []
}

# ------------------------------------------------------------------------------------------------------------
# File Callback Opcode
# File callback opcodes.
# Front-ends must always block-wait for user input.
# @see FileCallbackFunc and carla_set_file_callback()

# Debug.
# This opcode is undefined and used only for testing purposes.
FILE_CALLBACK_DEBUG = 0

# Open file or folder.
FILE_CALLBACK_OPEN = 1

# Save file or folder.
FILE_CALLBACK_SAVE = 2

# ------------------------------------------------------------------------------------------------------------
# Carla Host API (C stuff)

# File callback function.
# @see FileCallbackOpcode
FileCallbackFunc = CFUNCTYPE(c_char_p, c_void_p, c_enum, c_bool, c_char_p, c_char_p)

# Information about a loaded plugin.
# @see carla_get_plugin_info()
class CarlaPluginInfo(Structure):
    _fields_ = [
        # Plugin type.
        ("type", c_enum),

        # Plugin category.
        ("category", c_enum),

        # Plugin hints.
        # @see PluginHints
        ("hints", c_uint),

        # Plugin options available for the user to change.
        # @see PluginOptions
        ("optionsAvailable", c_uint),

        # Plugin options currently enabled.
        # Some options are enabled but not available, which means they will always be on.
        # @see PluginOptions
        ("optionsEnabled", c_uint),

        # Plugin filename.
        # This can be the plugin binary or resource file.
        ("filename", c_char_p),

        # Plugin name.
        # This name is unique within a Carla instance.
        # @see carla_get_real_plugin_name()
        ("name", c_char_p),

        # Plugin label or URI.
        ("label", c_char_p),

        # Plugin author/maker.
        ("maker", c_char_p),

        # Plugin copyright/license.
        ("copyright", c_char_p),

        # Icon name for this plugin, in lowercase.
        # Default is "plugin".
        ("iconName", c_char_p),

        # Patchbay client Id for this plugin.
        # When 0, Id is considered invalid or unused.
        ("patchbayClientId", c_int),

        # Plugin unique Id.
        # This Id is dependant on the plugin type and may sometimes be 0.
        ("uniqueId", c_long)
    ]

# Information about an internal Carla plugin.
# @see carla_get_internal_plugin_info()
class CarlaNativePluginInfo(Structure):
    _fields_ = [
        # Plugin category.
        ("category", c_enum),

        # Plugin hints.
        # @see PluginHints
        ("hints", c_uint),

        # Number of audio inputs.
        ("audioIns", c_uint32),

        # Number of audio outputs.
        ("audioOuts", c_uint32),

        # Number of MIDI inputs.
        ("midiIns", c_uint32),

        # Number of MIDI outputs.
        ("midiOuts", c_uint32),

        # Number of input parameters.
        ("parameterIns", c_uint32),

        # Number of output parameters.
        ("parameterOuts", c_uint32),

        # Plugin name.
        ("name", c_char_p),

        # Plugin label.
        ("label", c_char_p),

        # Plugin author/maker.
        ("maker", c_char_p),

        # Plugin copyright/license.
        ("copyright", c_char_p)
    ]

# Port count information, used for Audio and MIDI ports and parameters.
# @see carla_get_audio_port_count_info()
# @see carla_get_midi_port_count_info()
# @see carla_get_parameter_count_info()
class CarlaPortCountInfo(Structure):
    _fields_ = [
        # Number of inputs.
        ("ins", c_uint32),

        # Number of outputs.
        ("outs", c_uint32)
    ]

# Parameter information.
# @see carla_get_parameter_info()
class CarlaParameterInfo(Structure):
    _fields_ = [
        # Parameter name.
        ("name", c_char_p),

        # Parameter symbol.
        ("symbol", c_char_p),

        # Parameter unit.
        ("unit", c_char_p),

        # Number of scale points.
        # @see CarlaScalePointInfo
        ("scalePointCount", c_uint32)
    ]

# Parameter scale point information.
# @see carla_get_parameter_scalepoint_info()
class CarlaScalePointInfo(Structure):
    _fields_ = [
        # Scale point value.
        ("value", c_float),

        # Scale point label.
        ("label", c_char_p)
    ]

# Transport information.
# @see carla_get_transport_info()
class CarlaTransportInfo(Structure):
    _fields_ = [
        # Wherever transport is playing.
        ("playing", c_bool),

        # Current transport frame.
        ("frame", c_uint64),

        # Bar
        ("bar", c_int32),

        # Beat
        ("beat", c_int32),

        # Tick
        ("tick", c_int32),

        # Beats per minute.
        ("bpm", c_double)
    ]

# ------------------------------------------------------------------------------------------------------------
# Carla Host API (Python compatible stuff)

# @see CarlaPluginInfo
PyCarlaPluginInfo = {
    'type': PLUGIN_NONE,
    'category': PLUGIN_CATEGORY_NONE,
    'hints': 0x0,
    'optionsAvailable': 0x0,
    'optionsEnabled': 0x0,
    'filename': None,
    'name':  None,
    'label': None,
    'maker': None,
    'copyright': None,
    'iconName': None,
    'patchbayClientId': 0,
    'uniqueId': 0
}

# @see CarlaPortCountInfo
PyCarlaPortCountInfo = {
    'ins': 0,
    'outs': 0
}

# @see CarlaParameterInfo
PyCarlaParameterInfo = {
    'name': None,
    'symbol': None,
    'unit': None,
    'scalePointCount': 0,
}

# @see CarlaScalePointInfo
PyCarlaScalePointInfo = {
    'value': 0.0,
    'label': None
}

# @see CarlaTransportInfo
PyCarlaTransportInfo = {
    "playing": False,
    "frame": 0,
    "bar": 0,
    "beat": 0,
    "tick": 0,
    "bpm": 0.0
}

# ------------------------------------------------------------------------------------------------------------
# Set BINARY_NATIVE

if HAIKU or LINUX or MACOS:
    BINARY_NATIVE = BINARY_POSIX64 if kIs64bit else BINARY_POSIX32
elif WINDOWS:
    BINARY_NATIVE = BINARY_WIN64 if kIs64bit else BINARY_WIN32
else:
    BINARY_NATIVE = BINARY_OTHER

# ------------------------------------------------------------------------------------------------------------
# Python Host object (Control/Standalone)

class Host(object):
    def __init__(self, libName):
        object.__init__(self)
        self._init(libName)

    # Get the complete license text of used third-party code and features.
    # Returned string is in basic html format.
    def get_complete_license_text(self):
        return charPtrToString(self.lib.carla_get_complete_license_text())

    # Get all the supported file extensions in carla_load_file().
    # Returned string uses this syntax:
    # @code
    # "*.ext1;*.ext2;*.ext3"
    # @endcode
    def get_supported_file_extensions(self):
        return charPtrToString(self.lib.carla_get_supported_file_extensions())

    # Get how many engine drivers are available.
    def get_engine_driver_count(self):
        return int(self.lib.carla_get_engine_driver_count())

    # Get an engine driver name.
    # @param index Driver index
    def get_engine_driver_name(self, index):
        return charPtrToString(self.lib.carla_get_engine_driver_name(index))

    # Get the device names of an engine driver.
    # @param index Driver index
    def get_engine_driver_device_names(self, index):
        return charPtrPtrToStringList(self.lib.carla_get_engine_driver_device_names(index))

    # Get information about a device driver.
    # @param index Driver index
    # @param name  Device name
    def get_engine_driver_device_info(self, index, name):
        return structToDict(self.lib.carla_get_engine_driver_device_info(index, name).contents)

    # Get how many internal plugins are available.
    def get_internal_plugin_count(self):
        return int(self.lib.carla_get_internal_plugin_count())

    # Get information about an internal plugin.
    # @param index Internal plugin Id
    def get_internal_plugin_info(self, index):
        return structToDict(self.lib.carla_get_internal_plugin_info(index).contents)

    # Initialize the engine.
    # Make sure to call carla_engine_idle() at regular intervals afterwards.
    # @param driverName Driver to use
    # @param clientName Engine master client name
    def engine_init(self, driverName, clientName):
        return bool(self.lib.carla_engine_init(driverName.encode("utf-8"), clientName.encode("utf-8")))

    # Close the engine.
    # This function always closes the engine even if it returns false.
    # In other words, even when something goes wrong when closing the engine it still be closed nonetheless.
    def engine_close(self):
        return bool(self.lib.carla_engine_close())

    # Idle the engine.
    # Do not call this if the engine is not running.
    def engine_idle(self):
        self.lib.carla_engine_idle()

    # Check if the engine is running.
    def is_engine_running(self):
        return bool(self.lib.carla_is_engine_running())

    # Tell the engine it's about to close.
    # This is used to prevent the engine thread(s) from reactivating.
    def set_engine_about_to_close(self):
        self.lib.carla_set_engine_about_to_close()

    # Set the engine callback function.
    # @param func Callback function
    def set_engine_callback(self, func):
        self._engineCallback = EngineCallbackFunc(func)
        self.lib.carla_set_engine_callback(self._engineCallback, None)

    # Set an engine option.
    # @param option   Option
    # @param value    Value as number
    # @param valueStr Value as string
    def set_engine_option(self, option, value, valueStr):
        self.lib.carla_set_engine_option(option, value, valueStr.encode("utf-8"))

    # Set the file callback function.
    # @param func Callback function
    # @param ptr  Callback pointer
    def set_file_callback(self, func):
        self._fileCallback = FileCallbackFunc(func)
        self.lib.carla_set_file_callback(self._fileCallback, None)

    # Load a file of any type.\n
    # This will try to load a generic file as a plugin,
    # either by direct handling (Csound, GIG, SF2 and SFZ) or by using an internal plugin (like Audio and MIDI).
    # @param Filename Filename
    # @see carla_get_supported_file_extensions()
    def load_file(self, filename):
        return bool(self.lib.carla_load_file(filename.encode("utf-8")))

    # Load a Carla project file.
    # @param Filename Filename
    # @note Currently loaded plugins are not removed; call carla_remove_all_plugins() first if needed.
    def load_project(self, filename):
        return bool(self.lib.carla_load_project(filename.encode("utf-8")))

    # Save current project to a file.
    # @param Filename Filename
    def save_project(self, filename):
        return bool(self.lib.carla_save_project(filename.encode("utf-8")))

    # Connect two patchbay ports.
    # @param portIdA Output port
    # @param portIdB Input port
    # @see ENGINE_CALLBACK_PATCHBAY_CONNECTION_ADDED
    def patchbay_connect(self, portIdA, portIdB):
        return bool(self.lib.carla_patchbay_connect(portIdA, portIdB))

    # Disconnect two patchbay ports.
    # @param connectionId Connection Id
    # @see ENGINE_CALLBACK_PATCHBAY_CONNECTION_REMOVED
    def patchbay_disconnect(self, connectionId):
        return bool(self.lib.carla_patchbay_disconnect(connectionId))

    # Force the engine to resend all patchbay clients, ports and connections again.
    def patchbay_refresh(self):
        return bool(self.lib.carla_patchbay_refresh())

    # Start playback of the engine transport.
    def transport_play(self):
        self.lib.carla_transport_play()

    # Pause the engine transport.
    def transport_pause(self):
        self.lib.carla_transport_pause()

    # Relocate the engine transport to a specific frame.
    # @param frames Frame to relocate to.
    def transport_relocate(self, frame):
        self.lib.carla_transport_relocate(frame)

    # Get the current transport frame.
    def get_current_transport_frame(self):
        return bool(self.lib.carla_get_current_transport_frame())

    # Get the engine transport information.
    def get_transport_info(self):
        return structToDict(self.lib.carla_get_transport_info().contents)

    # Add a new plugin.
    # If you don't know the binary type use the BINARY_NATIVE macro.
    # @param btype    Binary type
    # @param ptype    Plugin type
    # @param filename Filename, if applicable
    # @param name     Name of the plugin, can be NULL
    # @param label    Plugin label, if applicable
    # @param extraPtr Extra pointer, defined per plugin type
    def add_plugin(self, btype, ptype, filename, name, label, extraPtr):
        cfilename = filename.encode("utf-8") if filename else None
        cname     = name.encode("utf-8") if name else None
        clabel    = label.encode("utf-8") if label else None
        return bool(self.lib.carla_add_plugin(btype, ptype, cfilename, cname, clabel, cast(extraPtr, c_void_p)))

    # Remove a plugin.
    # @param pluginId Plugin to remove.
    def remove_plugin(self, pluginId):
        return bool(self.lib.carla_remove_plugin(pluginId))

    # Remove all plugins.
    def remove_all_plugins(self):
        return bool(self.lib.carla_remove_all_plugins())

    # Rename a plugin.\n
    # Returns the new name, or NULL if the operation failed.
    # @param pluginId Plugin to rename
    # @param newName  New plugin name
    def rename_plugin(self, pluginId, newName):
        return charPtrToString(self.lib.carla_rename_plugin(pluginId, newName.encode("utf-8")))

    # Clone a plugin.
    # @param pluginId Plugin to clone
    def clone_plugin(self, pluginId):
        return bool(self.lib.carla_clone_plugin(pluginId))

    # Prepare replace of a plugin.\n
    # The next call to carla_add_plugin() will use this id, replacing the current plugin.
    # @param pluginId Plugin to replace
    # @note This function requires carla_add_plugin() to be called afterwards *as soon as possible*.
    def replace_plugin(self, pluginId):
        return bool(self.lib.carla_replace_plugin(pluginId))

    # Switch two plugins positions.
    # @param pluginIdA Plugin A
    # @param pluginIdB Plugin B
    def switch_plugins(self, pluginIdA, pluginIdB):
        return bool(self.lib.carla_switch_plugins(pluginIdA, pluginIdB))

    # Load a plugin state.
    # @param pluginId Plugin
    # @param filename Path to plugin state
    # @see carla_save_plugin_state()
    def load_plugin_state(self, pluginId, filename):
        return bool(self.lib.carla_load_plugin_state(pluginId, filename.encode("utf-8")))

    # Save a plugin state.
    # @param pluginId Plugin
    # @param filename Path to plugin state
    # @see carla_load_plugin_state()
    def save_plugin_state(self, pluginId, filename):
        return bool(self.lib.carla_save_plugin_state(pluginId, filename.encode("utf-8")))

    # Get information from a plugin.
    # @param pluginId Plugin
    def get_plugin_info(self, pluginId):
        return structToDict(self.lib.carla_get_plugin_info(pluginId).contents)

    # Get audio port count information from a plugin.
    # @param pluginId Plugin
    def get_audio_port_count_info(self, pluginId):
        return structToDict(self.lib.carla_get_audio_port_count_info(pluginId).contents)

    # Get MIDI port count information from a plugin.
    # @param pluginId Plugin
    def get_midi_port_count_info(self, pluginId):
        return structToDict(self.lib.carla_get_midi_port_count_info(pluginId).contents)

    # Get parameter count information from a plugin.
    # @param pluginId Plugin
    def get_parameter_count_info(self, pluginId):
        return structToDict(self.lib.carla_get_parameter_count_info(pluginId).contents)

    # Get parameter information from a plugin.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @see carla_get_parameter_count()
    def get_parameter_info(self, pluginId, parameterId):
        return structToDict(self.lib.carla_get_parameter_info(pluginId, parameterId).contents)

    # Get parameter scale point information from a plugin.
    # @param pluginId     Plugin
    # @param parameterId  Parameter index
    # @param scalePointId Parameter scale-point index
    # @see CarlaParameterInfo::scalePointCount
    def get_parameter_scalepoint_info(self, pluginId, parameterId, scalePointId):
        return structToDict(self.lib.carla_get_parameter_scalepoint_info(pluginId, parameterId, scalePointId).contents)

    # Get a plugin's parameter data.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @see carla_get_parameter_count()
    def get_parameter_data(self, pluginId, parameterId):
        return structToDict(self.lib.carla_get_parameter_data(pluginId, parameterId).contents)

    # Get a plugin's parameter ranges.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @see carla_get_parameter_count()
    def get_parameter_ranges(self, pluginId, parameterId):
        return structToDict(self.lib.carla_get_parameter_ranges(pluginId, parameterId).contents)

    # Get a plugin's MIDI program data.
    # @param pluginId      Plugin
    # @param midiProgramId MIDI Program index
    # @see carla_get_midi_program_count()
    def get_midi_program_data(self, pluginId, midiProgramId):
        return structToDict(self.lib.carla_get_midi_program_data(pluginId, midiProgramId).contents)

    # Get a plugin's custom data.
    # @param pluginId     Plugin
    # @param customDataId Custom data index
    # @see carla_get_custom_data_count()
    def get_custom_data(self, pluginId, customDataId):
        return structToDict(self.lib.carla_get_custom_data(pluginId, customDataId).contents)

    # Get a plugin's chunk data.
    # @param pluginId Plugin
    # @see PLUGIN_OPTION_USE_CHUNKS
    def get_chunk_data(self, pluginId):
        return charPtrToString(self.lib.carla_get_chunk_data(pluginId))

    # Get how many parameters a plugin has.
    # @param pluginId Plugin
    def get_parameter_count(self, pluginId):
        return int(self.lib.carla_get_parameter_count(pluginId))

    # Get how many programs a plugin has.
    # @param pluginId Plugin
    # @see carla_get_program_name()
    def get_program_count(self, pluginId):
        return int(self.lib.carla_get_program_count(pluginId))

    # Get how many MIDI programs a plugin has.
    # @param pluginId Plugin
    # @see carla_get_midi_program_name() and carla_get_midi_program_data()
    def get_midi_program_count(self, pluginId):
        return int(self.lib.carla_get_midi_program_count(pluginId))

    # Get how many custom data sets a plugin has.
    # @param pluginId Plugin
    # @see carla_get_custom_data()
    def get_custom_data_count(self, pluginId):
        return int(self.lib.carla_get_custom_data_count(pluginId))

    # Get a plugin's parameter text (custom display of internal values).
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @see PARAMETER_USES_CUSTOM_TEXT
    def get_parameter_text(self, pluginId, parameterId):
        return charPtrToString(self.lib.carla_get_parameter_text(pluginId, parameterId))

    # Get a plugin's program name.
    # @param pluginId  Plugin
    # @param programId Program index
    # @see carla_get_program_count()
    def get_program_name(self, pluginId, programId):
        return charPtrToString(self.lib.carla_get_program_name(pluginId, programId))

    # Get a plugin's MIDI program name.
    # @param pluginId      Plugin
    # @param midiProgramId MIDI Program index
    # @see carla_get_midi_program_count()
    def get_midi_program_name(self, pluginId, midiProgramId):
        return charPtrToString(self.lib.carla_get_midi_program_name(pluginId, midiProgramId))

    # Get a plugin's real name.\n
    # This is the name the plugin uses to identify itself; may not be unique.
    # @param pluginId Plugin
    def get_real_plugin_name(self, pluginId):
        return charPtrToString(self.lib.carla_get_real_plugin_name(pluginId))

    # Get a plugin's program index.
    # @param pluginId Plugin
    def get_current_program_index(self, pluginId):
        return int(self.lib.carla_get_current_program_index(pluginId))

    # Get a plugin's midi program index.
    # @param pluginId Plugin
    def get_current_midi_program_index(self, pluginId):
        return int(self.lib.carla_get_current_midi_program_index(pluginId))

    # Get a plugin's default parameter value.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    def get_default_parameter_value(self, pluginId, parameterId):
        return float(self.lib.carla_get_default_parameter_value(pluginId, parameterId))

    # Get a plugin's current parameter value.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    def get_current_parameter_value(self, pluginId, parameterId):
        return float(self.lib.carla_get_current_parameter_value(pluginId, parameterId))

    # Get a plugin's input peak value.
    # @param pluginId Plugin
    # @param isLeft   Wherever to get the left/mono value, otherwise right.
    def get_input_peak_value(self, pluginId, isLeft):
        return float(self.lib.carla_get_input_peak_value(pluginId, isLeft))

    # Get a plugin's output peak value.
    # @param pluginId Plugin
    # @param isLeft   Wherever to get the left/mono value, otherwise right.
    def get_output_peak_value(self, pluginId, isLeft):
        return float(self.lib.carla_get_output_peak_value(pluginId, isLeft))

    # Enable a plugin's option.
    # @param pluginId Plugin
    # @param option   An option from PluginOptions
    # @param yesNo    New enabled state
    def set_option(self, pluginId, option, yesNo):
        self.lib.carla_set_option(pluginId, option, yesNo)

    # Enable or disable a plugin.
    # @param pluginId Plugin
    # @param onOff    New active state
    def set_active(self, pluginId, onOff):
        self.lib.carla_set_active(pluginId, onOff)

    # Change a plugin's internal dry/wet.
    # @param pluginId Plugin
    # @param value    New dry/wet value
    def set_drywet(self, pluginId, value):
        self.lib.carla_set_drywet(pluginId, value)

    # Change a plugin's internal volume.
    # @param pluginId Plugin
    # @param value    New volume
    def set_volume(self, pluginId, value):
        self.lib.carla_set_volume(pluginId, value)

    # Change a plugin's internal stereo balance, left channel.
    # @param pluginId Plugin
    # @param value    New value
    def set_balance_left(self, pluginId, value):
        self.lib.carla_set_balance_left(pluginId, value)

    # Change a plugin's internal stereo balance, right channel.
    # @param pluginId Plugin
    # @param value    New value
    def set_balance_right(self, pluginId, value):
        self.lib.carla_set_balance_right(pluginId, value)

    # Change a plugin's internal mono panning value.
    # @param pluginId Plugin
    # @param value    New value
    def set_panning(self, pluginId, value):
        self.lib.carla_set_panning(pluginId, value)

    # Change a plugin's internal control channel.
    # @param pluginId Plugin
    # @param channel  New channel
    def set_ctrl_channel(self, pluginId, channel):
        self.lib.carla_set_ctrl_channel(pluginId, channel)

    # Change a plugin's parameter value.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @param value       New value
    def set_parameter_value(self, pluginId, parameterId, value):
        self.lib.carla_set_parameter_value(pluginId, parameterId, value)

    # Change a plugin's parameter MIDI cc.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @param cc          New MIDI cc
    def set_parameter_midi_channel(self, pluginId, parameterId, channel):
        self.lib.carla_set_parameter_midi_channel(pluginId, parameterId, channel)

    # Change a plugin's parameter MIDI channel.
    # @param pluginId    Plugin
    # @param parameterId Parameter index
    # @param channel     New MIDI channel
    def set_parameter_midi_cc(self, pluginId, parameterId, cc):
        self.lib.carla_set_parameter_midi_cc(pluginId, parameterId, cc)

    # Change a plugin's current program.
    # @param pluginId  Plugin
    # @param programId New program
    def set_program(self, pluginId, programId):
        self.lib.carla_set_program(pluginId, programId)

    # Change a plugin's current MIDI program.
    # @param pluginId      Plugin
    # @param midiProgramId New value
    def set_midi_program(self, pluginId, midiProgramId):
        self.lib.carla_set_midi_program(pluginId, midiProgramId)

    # Set a plugin's custom data set.
    # @param pluginId Plugin
    # @param type     Type
    # @param key      Key
    # @param value    New value
    # @see CustomDataTypes and CustomDataKeys
    def set_custom_data(self, pluginId, type_, key, value):
        self.lib.carla_set_custom_data(pluginId, type_.encode("utf-8"), key.encode("utf-8"), value.encode("utf-8"))

    # Set a plugin's chunk data.
    # @param pluginId Plugin
    # @param value    New value
    # @see PLUGIN_OPTION_USE_CHUNKS and carla_get_chunk_data()
    def set_chunk_data(self, pluginId, chunkData):
        self.lib.carla_set_chunk_data(pluginId, chunkData.encode("utf-8"))

    # Tell a plugin to prepare for save.\n
    # This should be called before saving custom data sets.
    # @param pluginId Plugin
    def prepare_for_save(self, pluginId):
        self.lib.carla_prepare_for_save(pluginId)

    # Send a single note of a plugin.\n
    # If velocity is 0, note-off is sent; note-on otherwise.
    # @param pluginId Plugin
    # @param channel  Note channel
    # @param note     Note pitch
    # @param velocity Note velocity
    def send_midi_note(self, pluginId, channel, note, velocity):
        self.lib.carla_send_midi_note(pluginId, channel, note, velocity)

    # Tell a plugin to show its own custom UI.
    # @param pluginId Plugin
    # @param yesNo    New UI state, visible or not
    # @see PLUGIN_HAS_CUSTOM_UI
    def show_custom_ui(self, pluginId, yesNo):
        self.lib.carla_show_custom_ui(pluginId, yesNo)

    # Get the current engine buffer size.
    def get_buffer_size(self):
        return int(self.lib.carla_get_buffer_size())

    # Get the current engine sample rate.
    def get_sample_rate(self):
        return float(self.lib.carla_get_sample_rate())

    # Get the last error.
    def get_last_error(self):
        return charPtrToString(self.lib.carla_get_last_error())

    # Get the current engine OSC URL (TCP).
    def get_host_osc_url_tcp(self):
        return charPtrToString(self.lib.carla_get_host_osc_url_tcp())

    # Get the current engine OSC URL (UDP).
    def get_host_osc_url_udp(self):
        return charPtrToString(self.lib.carla_get_host_osc_url_udp())

    def _init(self, libName):
        self.lib = cdll.LoadLibrary(libName)

        self.lib.carla_get_complete_license_text.argtypes = None
        self.lib.carla_get_complete_license_text.restype = c_char_p

        self.lib.carla_get_supported_file_extensions.argtypes = None
        self.lib.carla_get_supported_file_extensions.restype = c_char_p

        self.lib.carla_get_engine_driver_count.argtypes = None
        self.lib.carla_get_engine_driver_count.restype = c_uint

        self.lib.carla_get_engine_driver_name.argtypes = [c_uint]
        self.lib.carla_get_engine_driver_name.restype = c_char_p

        self.lib.carla_get_engine_driver_device_names.argtypes = [c_uint]
        self.lib.carla_get_engine_driver_device_names.restype = POINTER(c_char_p)

        self.lib.carla_get_engine_driver_device_info.argtypes = [c_uint, c_char_p]
        self.lib.carla_get_engine_driver_device_info.restype = POINTER(EngineDriverDeviceInfo)

        self.lib.carla_get_internal_plugin_count.argtypes = None
        self.lib.carla_get_internal_plugin_count.restype = c_uint

        self.lib.carla_get_internal_plugin_info.argtypes = [c_uint]
        self.lib.carla_get_internal_plugin_info.restype = POINTER(CarlaNativePluginInfo)

        self.lib.carla_engine_init.argtypes = [c_char_p, c_char_p]
        self.lib.carla_engine_init.restype = c_bool

        self.lib.carla_engine_close.argtypes = None
        self.lib.carla_engine_close.restype = c_bool

        self.lib.carla_engine_idle.argtypes = None
        self.lib.carla_engine_idle.restype = None

        self.lib.carla_is_engine_running.argtypes = None
        self.lib.carla_is_engine_running.restype = c_bool

        self.lib.carla_set_engine_about_to_close.argtypes = None
        self.lib.carla_set_engine_about_to_close.restype = None

        self.lib.carla_set_engine_callback.argtypes = [EngineCallbackFunc, c_void_p]
        self.lib.carla_set_engine_callback.restype = None

        self.lib.carla_set_engine_option.argtypes = [c_enum, c_int, c_char_p]
        self.lib.carla_set_engine_option.restype = None

        self.lib.carla_set_file_callback.argtypes = [FileCallbackFunc, c_void_p]
        self.lib.carla_set_file_callback.restype = None

        self.lib.carla_load_file.argtypes = [c_char_p]
        self.lib.carla_load_file.restype = c_bool

        self.lib.carla_load_project.argtypes = [c_char_p]
        self.lib.carla_load_project.restype = c_bool

        self.lib.carla_save_project.argtypes = [c_char_p]
        self.lib.carla_save_project.restype = c_bool

        self.lib.carla_patchbay_connect.argtypes = [c_int, c_int]
        self.lib.carla_patchbay_connect.restype = c_bool

        self.lib.carla_patchbay_disconnect.argtypes = [c_int]
        self.lib.carla_patchbay_disconnect.restype = c_bool

        self.lib.carla_patchbay_refresh.argtypes = None
        self.lib.carla_patchbay_refresh.restype = c_bool

        self.lib.carla_transport_play.argtypes = None
        self.lib.carla_transport_play.restype = None

        self.lib.carla_transport_pause.argtypes = None
        self.lib.carla_transport_pause.restype = None

        self.lib.carla_transport_relocate.argtypes = [c_uint64]
        self.lib.carla_transport_relocate.restype = None

        self.lib.carla_get_current_transport_frame.argtypes = None
        self.lib.carla_get_current_transport_frame.restype = c_uint64

        self.lib.carla_get_transport_info.argtypes = None
        self.lib.carla_get_transport_info.restype = POINTER(CarlaTransportInfo)

        self.lib.carla_add_plugin.argtypes = [c_enum, c_enum, c_char_p, c_char_p, c_char_p, c_void_p]
        self.lib.carla_add_plugin.restype = c_bool

        self.lib.carla_remove_plugin.argtypes = [c_uint]
        self.lib.carla_remove_plugin.restype = c_bool

        self.lib.carla_remove_all_plugins.argtypes = None
        self.lib.carla_remove_all_plugins.restype = c_bool

        self.lib.carla_rename_plugin.argtypes = [c_uint, c_char_p]
        self.lib.carla_rename_plugin.restype = c_char_p

        self.lib.carla_clone_plugin.argtypes = [c_uint]
        self.lib.carla_clone_plugin.restype = c_bool

        self.lib.carla_replace_plugin.argtypes = [c_uint]
        self.lib.carla_replace_plugin.restype = c_bool

        self.lib.carla_switch_plugins.argtypes = [c_uint, c_uint]
        self.lib.carla_switch_plugins.restype = c_bool

        self.lib.carla_load_plugin_state.argtypes = [c_uint, c_char_p]
        self.lib.carla_load_plugin_state.restype = c_bool

        self.lib.carla_save_plugin_state.argtypes = [c_uint, c_char_p]
        self.lib.carla_save_plugin_state.restype = c_bool

        self.lib.carla_get_plugin_info.argtypes = [c_uint]
        self.lib.carla_get_plugin_info.restype = POINTER(CarlaPluginInfo)

        self.lib.carla_get_audio_port_count_info.argtypes = [c_uint]
        self.lib.carla_get_audio_port_count_info.restype = POINTER(CarlaPortCountInfo)

        self.lib.carla_get_midi_port_count_info.argtypes = [c_uint]
        self.lib.carla_get_midi_port_count_info.restype = POINTER(CarlaPortCountInfo)

        self.lib.carla_get_parameter_count_info.argtypes = [c_uint]
        self.lib.carla_get_parameter_count_info.restype = POINTER(CarlaPortCountInfo)

        self.lib.carla_get_parameter_info.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_parameter_info.restype = POINTER(CarlaParameterInfo)

        self.lib.carla_get_parameter_scalepoint_info.argtypes = [c_uint, c_uint32, c_uint32]
        self.lib.carla_get_parameter_scalepoint_info.restype = POINTER(CarlaScalePointInfo)

        self.lib.carla_get_parameter_data.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_parameter_data.restype = POINTER(ParameterData)

        self.lib.carla_get_parameter_ranges.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_parameter_ranges.restype = POINTER(ParameterRanges)

        self.lib.carla_get_midi_program_data.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_midi_program_data.restype = POINTER(MidiProgramData)

        self.lib.carla_get_custom_data.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_custom_data.restype = POINTER(CustomData)

        self.lib.carla_get_chunk_data.argtypes = [c_uint]
        self.lib.carla_get_chunk_data.restype = c_char_p

        self.lib.carla_get_parameter_count.argtypes = [c_uint]
        self.lib.carla_get_parameter_count.restype = c_uint32

        self.lib.carla_get_program_count.argtypes = [c_uint]
        self.lib.carla_get_program_count.restype = c_uint32

        self.lib.carla_get_midi_program_count.argtypes = [c_uint]
        self.lib.carla_get_midi_program_count.restype = c_uint32

        self.lib.carla_get_custom_data_count.argtypes = [c_uint]
        self.lib.carla_get_custom_data_count.restype = c_uint32

        self.lib.carla_get_parameter_text.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_parameter_text.restype = c_char_p

        self.lib.carla_get_program_name.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_program_name.restype = c_char_p

        self.lib.carla_get_midi_program_name.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_midi_program_name.restype = c_char_p

        self.lib.carla_get_real_plugin_name.argtypes = [c_uint]
        self.lib.carla_get_real_plugin_name.restype = c_char_p

        self.lib.carla_get_current_program_index.argtypes = [c_uint]
        self.lib.carla_get_current_program_index.restype = c_int32

        self.lib.carla_get_current_midi_program_index.argtypes = [c_uint]
        self.lib.carla_get_current_midi_program_index.restype = c_int32

        self.lib.carla_get_default_parameter_value.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_default_parameter_value.restype = c_float

        self.lib.carla_get_current_parameter_value.argtypes = [c_uint, c_uint32]
        self.lib.carla_get_current_parameter_value.restype = c_float

        self.lib.carla_get_input_peak_value.argtypes = [c_uint, c_bool]
        self.lib.carla_get_input_peak_value.restype = c_float

        self.lib.carla_get_output_peak_value.argtypes = [c_uint, c_bool]
        self.lib.carla_get_output_peak_value.restype = c_float

        self.lib.carla_set_option.argtypes = [c_uint, c_uint, c_bool]
        self.lib.carla_set_option.restype = None

        self.lib.carla_set_active.argtypes = [c_uint, c_bool]
        self.lib.carla_set_active.restype = None

        self.lib.carla_set_drywet.argtypes = [c_uint, c_float]
        self.lib.carla_set_drywet.restype = None

        self.lib.carla_set_volume.argtypes = [c_uint, c_float]
        self.lib.carla_set_volume.restype = None

        self.lib.carla_set_balance_left.argtypes = [c_uint, c_float]
        self.lib.carla_set_balance_left.restype = None

        self.lib.carla_set_balance_right.argtypes = [c_uint, c_float]
        self.lib.carla_set_balance_right.restype = None

        self.lib.carla_set_panning.argtypes = [c_uint, c_float]
        self.lib.carla_set_panning.restype = None

        self.lib.carla_set_ctrl_channel.argtypes = [c_uint, c_int8]
        self.lib.carla_set_ctrl_channel.restype = None

        self.lib.carla_set_parameter_value.argtypes = [c_uint, c_uint32, c_float]
        self.lib.carla_set_parameter_value.restype = None

        self.lib.carla_set_parameter_midi_channel.argtypes = [c_uint, c_uint32, c_uint8]
        self.lib.carla_set_parameter_midi_channel.restype = None

        self.lib.carla_set_parameter_midi_cc.argtypes = [c_uint, c_uint32, c_int16]
        self.lib.carla_set_parameter_midi_cc.restype = None

        self.lib.carla_set_program.argtypes = [c_uint, c_uint32]
        self.lib.carla_set_program.restype = None

        self.lib.carla_set_midi_program.argtypes = [c_uint, c_uint32]
        self.lib.carla_set_midi_program.restype = None

        self.lib.carla_set_custom_data.argtypes = [c_uint, c_char_p, c_char_p, c_char_p]
        self.lib.carla_set_custom_data.restype = None

        self.lib.carla_set_chunk_data.argtypes = [c_uint, c_char_p]
        self.lib.carla_set_chunk_data.restype = None

        self.lib.carla_prepare_for_save.argtypes = [c_uint]
        self.lib.carla_prepare_for_save.restype = None

        self.lib.carla_send_midi_note.argtypes = [c_uint, c_uint8, c_uint8, c_uint8]
        self.lib.carla_send_midi_note.restype = None

        self.lib.carla_show_custom_ui.argtypes = [c_uint, c_bool]
        self.lib.carla_show_custom_ui.restype = None

        self.lib.carla_get_buffer_size.argtypes = None
        self.lib.carla_get_buffer_size.restype = c_uint32

        self.lib.carla_get_sample_rate.argtypes = None
        self.lib.carla_get_sample_rate.restype = c_double

        self.lib.carla_get_last_error.argtypes = None
        self.lib.carla_get_last_error.restype = c_char_p

        self.lib.carla_get_host_osc_url_tcp.argtypes = None
        self.lib.carla_get_host_osc_url_tcp.restype = c_char_p

        self.lib.carla_get_host_osc_url_udp.argtypes = None
        self.lib.carla_get_host_osc_url_udp.restype = c_char_p