Jack2 1.9.8

JackAlsaAdapter.cpp

00001 /*
00002 Copyright (C) 2008 Grame
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU General Public License as published by
00006 the Free Software Foundation; either version 2 of the License, or
00007 (at your option) any later version.
00008 
00009 This program is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 GNU General Public License for more details.
00013 
00014 You should have received a copy of the GNU General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 
00018 */
00019 
00020 #if defined(HAVE_CONFIG_H)
00021 #include "config.h"
00022 #endif
00023 
00024 #include "JackAlsaAdapter.h"
00025 #include "JackGlobals.h"
00026 #include "JackEngineControl.h"
00027 
00028 namespace Jack
00029 {
00030 
00031     JackAlsaAdapter::JackAlsaAdapter ( jack_nframes_t buffer_size, jack_nframes_t sample_rate, const JSList* params ) :
00032             JackAudioAdapterInterface ( buffer_size, sample_rate ),
00033             fThread ( this ),
00034             fAudioInterface ( buffer_size, sample_rate )
00035     {
00036         const JSList* node;
00037         const jack_driver_param_t* param;
00038 
00039         fCaptureChannels = 2;
00040         fPlaybackChannels = 2;
00041 
00042         fAudioInterface.fPeriod = 2;
00043 
00044         for ( node = params; node; node = jack_slist_next ( node ) )
00045         {
00046             param = ( const jack_driver_param_t* ) node->data;
00047 
00048             switch ( param->character )
00049             {
00050                 case 'i':
00051                     fCaptureChannels = param->value.ui;
00052                     break;
00053                 case 'o':
00054                     fPlaybackChannels = param->value.ui;
00055                     break;
00056                 case 'C':
00057                     break;
00058                 case 'P':
00059                     break;
00060                 case 'D':
00061                     break;
00062                 case 'n':
00063                     fAudioInterface.fPeriod = param->value.ui;
00064                     break;
00065                 case 'd':
00066                     fAudioInterface.fCardName = strdup ( param->value.str );
00067                     break;
00068                 case 'r':
00069                     fAudioInterface.fFrequency = param->value.ui;
00070                     SetAdaptedSampleRate ( param->value.ui );
00071                     break;
00072                 case 'p':
00073                     fAudioInterface.fBuffering = param->value.ui;
00074                     SetAdaptedBufferSize ( param->value.ui );
00075                     break;
00076                 case 'q':
00077                     fQuality = param->value.ui;
00078                     break;
00079                 case 'g':
00080                     fRingbufferCurSize = param->value.ui;
00081                     fAdaptative = false;
00082                     break;
00083             }
00084         }
00085 
00086         fAudioInterface.setInputs ( fCaptureChannels );
00087         fAudioInterface.setOutputs ( fPlaybackChannels );
00088     }
00089 
00090     int JackAlsaAdapter::Open()
00091     {
00092         //open audio interface
00093         if ( fAudioInterface.open() )
00094             return -1;
00095 
00096         //start adapter thread
00097         if ( fThread.StartSync() < 0 )
00098         {
00099             jack_error ( "Cannot start audioadapter thread" );
00100             return -1;
00101         }
00102 
00103         //display card info
00104         fAudioInterface.longinfo();
00105 
00106         //turn the thread realtime
00107         fThread.AcquireRealTime(GetEngineControl()->fClientPriority);
00108         return 0;
00109     }
00110 
00111     int JackAlsaAdapter::Close()
00112     {
00113 #ifdef JACK_MONITOR
00114         fTable.Save(fHostBufferSize, fHostSampleRate, fAdaptedSampleRate, fAdaptedBufferSize);
00115 #endif
00116         switch ( fThread.GetStatus() )
00117         {
00118 
00119                 // Kill the thread in Init phase
00120             case JackThread::kStarting:
00121             case JackThread::kIniting:
00122                 if ( fThread.Kill() < 0 )
00123                 {
00124                     jack_error ( "Cannot kill thread" );
00125                     return -1;
00126                 }
00127                 break;
00128 
00129                 // Stop when the thread cycle is finished
00130             case JackThread::kRunning:
00131                 if ( fThread.Stop() < 0 )
00132                 {
00133                     jack_error ( "Cannot stop thread" );
00134                     return -1;
00135                 }
00136                 break;
00137 
00138             default:
00139                 break;
00140         }
00141         return fAudioInterface.close();
00142     }
00143 
00144     bool JackAlsaAdapter::Init()
00145     {
00146         //fill the hardware buffers
00147         for ( unsigned int i = 0; i < fAudioInterface.fPeriod; i++ )
00148             fAudioInterface.write();
00149         return true;
00150     }
00151 
00152     bool JackAlsaAdapter::Execute()
00153     {
00154         //read data from audio interface
00155         if (fAudioInterface.read() < 0)
00156             return false;
00157 
00158         PushAndPull(fAudioInterface.fInputSoftChannels, fAudioInterface.fOutputSoftChannels, fAdaptedBufferSize);
00159 
00160         //write data to audio interface
00161         if (fAudioInterface.write() < 0)
00162             return false;
00163 
00164         return true;
00165     }
00166 
00167     int JackAlsaAdapter::SetSampleRate ( jack_nframes_t sample_rate )
00168     {
00169         JackAudioAdapterInterface::SetHostSampleRate ( sample_rate );
00170         Close();
00171         return Open();
00172     }
00173 
00174     int JackAlsaAdapter::SetBufferSize ( jack_nframes_t buffer_size )
00175     {
00176         JackAudioAdapterInterface::SetHostBufferSize ( buffer_size );
00177         Close();
00178         return Open();
00179     }
00180 
00181 } // namespace
00182 
00183 #ifdef __cplusplus
00184 extern "C"
00185 {
00186 #endif
00187 
00188     SERVER_EXPORT jack_driver_desc_t* jack_get_descriptor()
00189     {
00190         jack_driver_desc_t * desc;
00191         jack_driver_desc_filler_t filler;
00192         jack_driver_param_value_t value;
00193 
00194         desc = jack_driver_descriptor_construct("audioadapter", JackDriverNone, "netjack audio <==> net backend adapter", &filler);
00195 
00196         strcpy(value.str, "none");
00197         jack_driver_descriptor_add_parameter(desc, &filler, "capture", 'C', JackDriverParamString, &value, NULL, "Provide capture ports.  Optionally set device", NULL);
00198         jack_driver_descriptor_add_parameter(desc, &filler, "playback", 'P', JackDriverParamString, &value, NULL, "Provide playback ports.  Optionally set device", NULL);
00199 
00200         strcpy(value.str, "hw:0");
00201         jack_driver_descriptor_add_parameter(desc, &filler, "device", 'd', JackDriverParamString, &value, NULL, "ALSA device name", NULL);
00202 
00203         value.ui  = 48000U;
00204         jack_driver_descriptor_add_parameter(desc, &filler, "rate", 'r', JackDriverParamUInt, &value, NULL, "Sample rate", NULL);
00205 
00206         value.ui  = 512U;
00207         jack_driver_descriptor_add_parameter(desc, &filler, "periodsize", 'p', JackDriverParamUInt, &value, NULL, "Period size", NULL);
00208 
00209         value.ui  = 2U;
00210         jack_driver_descriptor_add_parameter(desc, &filler, "nperiods", 'n', JackDriverParamUInt, &value, NULL, "Number of periods of playback latency", NULL);
00211 
00212         value.i  = true;
00213         jack_driver_descriptor_add_parameter(desc, &filler, "duplex", 'D', JackDriverParamBool, &value, NULL, "Provide both capture and playback ports", NULL);
00214 
00215         value.i  = 0;
00216         jack_driver_descriptor_add_parameter(desc, &filler, "in-channels", 'i', JackDriverParamInt, &value, NULL, "Number of capture channels (defaults to hardware max)", NULL);
00217         jack_driver_descriptor_add_parameter(desc, &filler, "out-channels", 'o', JackDriverParamInt, &value, NULL, "Number of playback channels (defaults to hardware max)", NULL);
00218 
00219         value.ui  = 0;
00220         jack_driver_descriptor_add_parameter(desc, &filler, "quality", 'q', JackDriverParamUInt, &value, NULL, "Resample algorithm quality (0 - 4)", NULL);
00221 
00222         value.ui = 32768;
00223         jack_driver_descriptor_add_parameter(desc, &filler, "ring-buffer", 'g', JackDriverParamUInt, &value, NULL, "Fixed ringbuffer size", "Fixed ringbuffer size (if not set => automatic adaptative)");
00224 
00225         return desc;
00226     }
00227 
00228 #ifdef __cplusplus
00229 }
00230 #endif
00231