Jack2 1.9.6
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00001 /* 00002 Copyright (C) 2001 Paul Davis 00003 Copyright (C) 2004-2008 Grame 00004 00005 This program is free software; you can redistribute it and/or modify 00006 it under the terms of the GNU General Public License as published by 00007 the Free Software Foundation; either version 2 of the License, or 00008 (at your option) any later version. 00009 00010 This program is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00013 GNU General Public License for more details. 00014 00015 You should have received a copy of the GNU General Public License 00016 along with this program; if not, write to the Free Software 00017 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00018 00019 */ 00020 00021 #include "JackDummyDriver.h" 00022 #include "JackEngineControl.h" 00023 #include "JackGraphManager.h" 00024 #include "JackDriverLoader.h" 00025 #include "JackThreadedDriver.h" 00026 #include "JackCompilerDeps.h" 00027 #include <iostream> 00028 #include <unistd.h> 00029 00030 namespace Jack 00031 { 00032 00033 int JackDummyDriver::Open(jack_nframes_t buffer_size, 00034 jack_nframes_t samplerate, 00035 bool capturing, 00036 bool playing, 00037 int inchannels, 00038 int outchannels, 00039 bool monitor, 00040 const char* capture_driver_name, 00041 const char* playback_driver_name, 00042 jack_nframes_t capture_latency, 00043 jack_nframes_t playback_latency) 00044 { 00045 if (JackAudioDriver::Open(buffer_size, 00046 samplerate, 00047 capturing, 00048 playing, 00049 inchannels, 00050 outchannels, 00051 monitor, 00052 capture_driver_name, 00053 playback_driver_name, 00054 capture_latency, 00055 playback_latency) == 0) { 00056 fEngineControl->fPeriod = 0; 00057 fEngineControl->fComputation = 500 * 1000; 00058 fEngineControl->fConstraint = 500 * 1000; 00059 return 0; 00060 } else { 00061 return -1; 00062 } 00063 } 00064 00065 int JackDummyDriver::Process() 00066 { 00067 JackDriver::CycleTakeBeginTime(); 00068 JackAudioDriver::Process(); 00069 JackSleep(std::max(0L, long(fWaitTime - (GetMicroSeconds() - fBeginDateUst)))); 00070 return 0; 00071 } 00072 00073 int JackDummyDriver::SetBufferSize(jack_nframes_t buffer_size) 00074 { 00075 JackAudioDriver::SetBufferSize(buffer_size); 00076 fWaitTime = (unsigned long)((((float)buffer_size) / ((float)fEngineControl->fSampleRate)) * 1000000.0f); 00077 return 0; 00078 } 00079 00080 } // end of namespace 00081 00082 #ifdef __cplusplus 00083 extern "C" 00084 { 00085 #endif 00086 00087 SERVER_EXPORT jack_driver_desc_t * driver_get_descriptor () { 00088 jack_driver_desc_t * desc; 00089 unsigned int i; 00090 00091 desc = (jack_driver_desc_t*)calloc (1, sizeof (jack_driver_desc_t)); 00092 strcpy(desc->name, "dummy"); // size MUST be less then JACK_DRIVER_NAME_MAX + 1 00093 strcpy(desc->desc, "Timer based backend"); // size MUST be less then JACK_DRIVER_PARAM_DESC + 1 00094 00095 desc->nparams = 6; 00096 desc->params = (jack_driver_param_desc_t*)calloc (desc->nparams, sizeof (jack_driver_param_desc_t)); 00097 00098 i = 0; 00099 strcpy(desc->params[i].name, "capture"); 00100 desc->params[i].character = 'C'; 00101 desc->params[i].type = JackDriverParamUInt; 00102 desc->params[i].value.ui = 2U; 00103 strcpy(desc->params[i].short_desc, "Number of capture ports"); 00104 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00105 00106 i++; 00107 strcpy(desc->params[i].name, "playback"); 00108 desc->params[i].character = 'P'; 00109 desc->params[i].type = JackDriverParamUInt; 00110 desc->params[1].value.ui = 2U; 00111 strcpy(desc->params[i].short_desc, "Number of playback ports"); 00112 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00113 00114 i++; 00115 strcpy(desc->params[i].name, "rate"); 00116 desc->params[i].character = 'r'; 00117 desc->params[i].type = JackDriverParamUInt; 00118 desc->params[i].value.ui = 48000U; 00119 strcpy(desc->params[i].short_desc, "Sample rate"); 00120 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00121 00122 i++; 00123 strcpy(desc->params[i].name, "monitor"); 00124 desc->params[i].character = 'm'; 00125 desc->params[i].type = JackDriverParamBool; 00126 desc->params[i].value.i = 0; 00127 strcpy(desc->params[i].short_desc, "Provide monitor ports for the output"); 00128 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00129 00130 i++; 00131 strcpy(desc->params[i].name, "period"); 00132 desc->params[i].character = 'p'; 00133 desc->params[i].type = JackDriverParamUInt; 00134 desc->params[i].value.ui = 1024U; 00135 strcpy(desc->params[i].short_desc, "Frames per period"); 00136 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00137 00138 i++; 00139 strcpy(desc->params[i].name, "wait"); 00140 desc->params[i].character = 'w'; 00141 desc->params[i].type = JackDriverParamUInt; 00142 desc->params[i].value.ui = 21333U; 00143 strcpy(desc->params[i].short_desc, 00144 "Number of usecs to wait between engine processes"); 00145 strcpy(desc->params[i].long_desc, desc->params[i].short_desc); 00146 00147 return desc; 00148 } 00149 00150 SERVER_EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLockedEngine* engine, Jack::JackSynchro* table, const JSList* params) { 00151 jack_nframes_t sample_rate = 48000; 00152 jack_nframes_t period_size = 1024; 00153 unsigned int capture_ports = 2; 00154 unsigned int playback_ports = 2; 00155 unsigned long wait_time = 0; 00156 const JSList * node; 00157 const jack_driver_param_t * param; 00158 bool monitor = false; 00159 00160 for (node = params; node; node = jack_slist_next (node)) { 00161 param = (const jack_driver_param_t *) node->data; 00162 00163 switch (param->character) { 00164 00165 case 'C': 00166 capture_ports = param->value.ui; 00167 break; 00168 00169 case 'P': 00170 playback_ports = param->value.ui; 00171 break; 00172 00173 case 'r': 00174 sample_rate = param->value.ui; 00175 break; 00176 00177 case 'p': 00178 period_size = param->value.ui; 00179 break; 00180 00181 case 'w': 00182 wait_time = param->value.ui; 00183 break; 00184 00185 case 'm': 00186 monitor = param->value.i; 00187 break; 00188 } 00189 } 00190 00191 if (wait_time == 0) // Not set 00192 wait_time = (unsigned long)((((float)period_size) / ((float)sample_rate)) * 1000000.0f); 00193 00194 Jack::JackDriverClientInterface* driver = new Jack::JackThreadedDriver(new Jack::JackDummyDriver("system", "dummy_pcm", engine, table, wait_time)); 00195 if (driver->Open(period_size, sample_rate, 1, 1, capture_ports, playback_ports, monitor, "dummy", "dummy", 0, 0) == 0) { 00196 return driver; 00197 } else { 00198 delete driver; 00199 return NULL; 00200 } 00201 } 00202 00203 #ifdef __cplusplus 00204 } 00205 #endif