Carla host example

carla-host.py

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

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

from carla_backend import *
from signal import signal, SIGINT, SIGTERM
from time import sleep
from sys import exit

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

class CarlaObject(object):
    __slots__ = [
        'term'
    ]

gCarla = CarlaObject()
gCarla.term = False

def signalHandler(sig, frame):
    if sig in (SIGINT, SIGTERM):
        gCarla.term = True

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

binaryDir = "/home/paulo/git/Carla/bin"
host = CarlaHostDLL("/home/paulo/git/Carla/bin/libcarla_standalone2.so", False)
host.set_engine_option(ENGINE_OPTION_PATH_BINARIES, 0, binaryDir)

if not host.engine_init("JACK", "Carla-uhe-test"):
    print("Engine failed to initialize, possible reasons:\n%s" % host.get_last_error())
    exit(1)


def callback(*args, **kwargs):
    print('args:', args)
    print('kwargs:', kwargs)

host.set_engine_callback(callback)

#if not host.add_plugin(BINARY_NATIVE, PLUGIN_VST2, "/home/falktx/.vst/u-he/ACE.64.so", "", "", 0, None, 0):
#    print("Failed to load plugin, possible reasons:\n%s" % host.get_last_error())
#    host.engine_close()
#    exit(1)


if not host.add_plugin(BINARY_NATIVE, PLUGIN_LV2, "/usr/lib/lv2/gx_echo.lv2/gx_echo.so", "effect_0", "http://guitarix.sourceforge.net/plugins/gx_echo_stereo#_echo_stereo", 6, None, 0):
    print("Failed to load plugin, possible reasons:\n%s" % host.get_last_error())

if not host.add_plugin(BINARY_NATIVE, PLUGIN_LV2, "/usr/lib/lv2/gx_echo.lv2/gx_echo.so", "effect_1", "http://guitarix.sourceforge.net/plugins/gx_echo_stereo#_echo_stereo", 7, None, 0):
    print("Failed to load plugin, possible reasons:\n%s" % host.get_last_error())

print(host.get_plugin_info(0))
print(host.get_plugin_info(1))

print(host.rename_plugin(0, "Teste PM"))

print(host.get_parameter_count_info(0))
print(host.get_parameter_ranges(0, 0))
print(host.set_parameter_value(0, 0, .3))


# Arguments
#  groupIdA: Effect output general id
#  portIdA: Output unique id
#  groupIdB: Effect input general id
#  portIdB: Input unique id
# The system effect are id general 2
# The first effect added are id general 3
# If I rename the effect, it will be removed and readded, then your id will be id general 4
# The group general id are diferent from effect id
# The port id I don't know
print(host.patchbay_connect(4, 13, 5, 15))

signal(SIGINT,  signalHandler)
signal(SIGTERM, signalHandler)

while host.is_engine_running() and not gCarla.term:
    host.engine_idle()
    sleep(0.5)

if not gCarla.term:
    print("Engine closed abruptely")

if not host.engine_close():
    print("Engine failed to close, possible reasons:\n%s" % host.get_last_error())
    exit(1)