213 lines
7.3 KiB
C++
213 lines
7.3 KiB
C++
/*
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Copyright (C) 2001 Paul Davis
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Copyright (C) 2004-2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "JackDummyDriver.h"
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#include "JackEngineControl.h"
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#include "JackGraphManager.h"
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#include "JackDriverLoader.h"
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#include "JackThreadedDriver.h"
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#include "JackCompilerDeps.h"
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#include <iostream>
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#include <unistd.h>
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namespace Jack
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{
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int JackDummyDriver::Open(jack_nframes_t buffer_size,
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jack_nframes_t samplerate,
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bool capturing,
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bool playing,
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int inchannels,
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int outchannels,
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bool monitor,
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const char* capture_driver_name,
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const char* playback_driver_name,
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jack_nframes_t capture_latency,
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jack_nframes_t playback_latency)
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{
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if (JackAudioDriver::Open(buffer_size,
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samplerate,
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capturing,
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playing,
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inchannels,
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outchannels,
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monitor,
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capture_driver_name,
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playback_driver_name,
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capture_latency,
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playback_latency) == 0) {
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fEngineControl->fPeriod = 0;
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fEngineControl->fComputation = 500 * 1000;
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fEngineControl->fConstraint = 500 * 1000;
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int buffer_size = int((fWaitTime * fEngineControl->fSampleRate) / 1000000.0f);
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if (buffer_size > BUFFER_SIZE_MAX) {
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buffer_size = BUFFER_SIZE_MAX;
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jack_error("Buffer size set to %d ", BUFFER_SIZE_MAX);
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}
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SetBufferSize(buffer_size);
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return 0;
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} else {
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return -1;
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}
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}
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int JackDummyDriver::Process()
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{
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JackDriver::CycleTakeBeginTime();
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JackAudioDriver::Process();
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JackSleep(std::max(0L, long(fWaitTime - (GetMicroSeconds() - fBeginDateUst))));
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return 0;
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}
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int JackDummyDriver::SetBufferSize(jack_nframes_t buffer_size)
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{
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// Generic change, never fails
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JackAudioDriver::SetBufferSize(buffer_size);
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fWaitTime = (unsigned long)((((float)buffer_size) / ((float)fEngineControl->fSampleRate)) * 1000000.0f);
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return 0;
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}
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} // end of namespace
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor () {
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jack_driver_desc_t * desc;
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unsigned int i;
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desc = (jack_driver_desc_t*)calloc (1, sizeof (jack_driver_desc_t));
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strcpy(desc->name, "dummy"); // size MUST be less then JACK_DRIVER_NAME_MAX + 1
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strcpy(desc->desc, "Timer based backend"); // size MUST be less then JACK_DRIVER_PARAM_DESC + 1
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desc->nparams = 6;
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desc->params = (jack_driver_param_desc_t*)calloc (desc->nparams, sizeof (jack_driver_param_desc_t));
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i = 0;
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strcpy(desc->params[i].name, "capture");
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desc->params[i].character = 'C';
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desc->params[i].type = JackDriverParamUInt;
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desc->params[i].value.ui = 2U;
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strcpy(desc->params[i].short_desc, "Number of capture ports");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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i++;
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strcpy(desc->params[i].name, "playback");
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desc->params[i].character = 'P';
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desc->params[i].type = JackDriverParamUInt;
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desc->params[1].value.ui = 2U;
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strcpy(desc->params[i].short_desc, "Number of playback ports");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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i++;
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strcpy(desc->params[i].name, "rate");
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desc->params[i].character = 'r';
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desc->params[i].type = JackDriverParamUInt;
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desc->params[i].value.ui = 48000U;
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strcpy(desc->params[i].short_desc, "Sample rate");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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i++;
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strcpy(desc->params[i].name, "monitor");
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desc->params[i].character = 'm';
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desc->params[i].type = JackDriverParamBool;
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desc->params[i].value.i = 0;
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strcpy(desc->params[i].short_desc, "Provide monitor ports for the output");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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i++;
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strcpy(desc->params[i].name, "period");
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desc->params[i].character = 'p';
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desc->params[i].type = JackDriverParamUInt;
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desc->params[i].value.ui = 1024U;
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strcpy(desc->params[i].short_desc, "Frames per period");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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i++;
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strcpy(desc->params[i].name, "wait");
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desc->params[i].character = 'w';
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desc->params[i].type = JackDriverParamUInt;
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desc->params[i].value.ui = 21333U;
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strcpy(desc->params[i].short_desc,
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"Number of usecs to wait between engine processes");
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strcpy(desc->params[i].long_desc, desc->params[i].short_desc);
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return desc;
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}
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SERVER_EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLockedEngine* engine, Jack::JackSynchro* table, const JSList* params) {
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jack_nframes_t sample_rate = 48000;
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jack_nframes_t period_size = 1024;
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unsigned int capture_ports = 2;
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unsigned int playback_ports = 2;
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unsigned long wait_time = 0;
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const JSList * node;
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const jack_driver_param_t * param;
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bool monitor = false;
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for (node = params; node; node = jack_slist_next (node)) {
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param = (const jack_driver_param_t *) node->data;
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switch (param->character) {
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case 'C':
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capture_ports = param->value.ui;
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break;
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case 'P':
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playback_ports = param->value.ui;
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break;
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case 'r':
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sample_rate = param->value.ui;
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break;
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case 'p':
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period_size = param->value.ui;
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break;
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case 'w':
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wait_time = param->value.ui;
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break;
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case 'm':
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monitor = param->value.i;
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break;
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}
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}
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if (wait_time == 0) // Not set
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wait_time = (unsigned long)((((float)period_size) / ((float)sample_rate)) * 1000000.0f);
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Jack::JackDriverClientInterface* driver = new Jack::JackThreadedDriver(new Jack::JackDummyDriver("system", "dummy_pcm", engine, table, wait_time));
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if (driver->Open(period_size, sample_rate, 1, 1, capture_ports, playback_ports, monitor, "dummy", "dummy", 0, 0) == 0) {
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return driver;
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} else {
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delete driver;
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return NULL;
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}
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}
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#ifdef __cplusplus
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}
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#endif
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