JackDummyDriver.cpp
/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2008 Grame
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
(at your option) 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "JackDummyDriver.h"
#include "JackDriverLoader.h"
#include "JackThreadedDriver.h"
#include "JackCompilerDeps.h"
#include <iostream>
#include <unistd.h>
#include <math.h>
#ifdef __cplusplus
extern "C"
{
#endif
SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor () {
jack_driver_desc_t * desc;
jack_driver_desc_filler_t filler;
jack_driver_param_value_t value;
desc = jack_driver_descriptor_construct("dummy", JackDriverMaster, "Timer based backend", &filler);
value.ui = 2U;
jack_driver_descriptor_add_parameter(desc, &filler, "capture", 'C', JackDriverParamUInt, &value, NULL, "Number of capture ports", NULL);
jack_driver_descriptor_add_parameter(desc, &filler, "playback", 'P', JackDriverParamUInt, &value, NULL, "Number of playback ports", NULL);
value.ui = 48000U;
jack_driver_descriptor_add_parameter(desc, &filler, "rate", 'r', JackDriverParamUInt, &value, NULL, "Sample rate", NULL);
value.i = 0;
jack_driver_descriptor_add_parameter(desc, &filler, "monitor", 'm', JackDriverParamBool, &value, NULL, "Provide monitor ports for the output", NULL);
value.ui = 1024U;
jack_driver_descriptor_add_parameter(desc, &filler, "period", 'p', JackDriverParamUInt, &value, NULL, "Frames per period", NULL);
value.ui = 21333U;
jack_driver_descriptor_add_parameter(desc, &filler, "wait", 'w', JackDriverParamUInt, &value, NULL, "Number of usecs to wait between engine processes", NULL);
return desc;
}
SERVER_EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLockedEngine* engine, Jack::JackSynchro* table, const JSList* params) {
jack_nframes_t sample_rate = 48000;
jack_nframes_t buffer_size = 1024;
unsigned int capture_ports = 2;
unsigned int playback_ports = 2;
int wait_time = 0;
const JSList * node;
const jack_driver_param_t * param;
bool monitor = false;
for (node = params; node; node = jack_slist_next (node)) {
param = (const jack_driver_param_t *) node->data;
switch (param->character) {
case 'C':
capture_ports = param->value.ui;
break;
case 'P':
playback_ports = param->value.ui;
break;
case 'r':
sample_rate = param->value.ui;
break;
case 'p':
buffer_size = param->value.ui;
break;
case 'w':
wait_time = param->value.ui;
break;
case 'm':
monitor = param->value.i;
break;
}
}
if (wait_time > 0) {
buffer_size = lroundf((float(wait_time) * float(sample_rate)) / 1000000.0f);
}
if (buffer_size > BUFFER_SIZE_MAX) {
buffer_size = BUFFER_SIZE_MAX;
jack_error("Buffer size set to %d", BUFFER_SIZE_MAX);
}
Jack::JackDriverClientInterface* driver = new Jack::JackThreadedDriver(new Jack::JackDummyDriver("system", "dummy_pcm", engine, table));
if (driver->Open(buffer_size, sample_rate, 1, 1, capture_ports, playback_ports, monitor, "dummy", "dummy", 0, 0) == 0) {
return driver;
} else {
delete driver;
return NULL;
}
}
#ifdef __cplusplus
}
#endif
Jack::JackThreadedDriver
The base class for threaded drivers using a "decorator" pattern. Threaded drivers are used with block...
Definition: JackThreadedDriver.h:34
Jack::JackLockedEngine
Locked Engine, access to methods is serialized using a mutex.
Definition: JackLockedEngine.h:78
jack_driver_param_value_t
Definition: driver_interface.h:64
Jack::JackPosixSemaphore
Inter process synchronization using POSIX semaphore.
Definition: JackPosixSemaphore.h:36
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
Jack::JackDummyDriver
The dummy driver.
Definition: JackDummyDriver.h:33
jack_driver_desc_filler_t
Definition: driver_interface.h:142
Jack::JackDriverClientInterface
The base interface for drivers clients.
Definition: JackDriver.h:114
jack_driver_param_t
Definition: driver_interface.h:125
_JSList
Definition: linux/alsa/jslist.h:35
jack_driver_desc_t
Definition: driver_interface.h:132