Jack2  1.9.8
JackAlsaAdapter.cpp
1 /*
2 Copyright (C) 2008 Grame
3 
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8 
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 
18 */
19 
20 #if defined(HAVE_CONFIG_H)
21 #include "config.h"
22 #endif
23 
24 #include "JackAlsaAdapter.h"
25 #include "JackGlobals.h"
26 #include "JackEngineControl.h"
27 
28 namespace Jack
29 {
30 
31  JackAlsaAdapter::JackAlsaAdapter ( jack_nframes_t buffer_size, jack_nframes_t sample_rate, const JSList* params ) :
32  JackAudioAdapterInterface ( buffer_size, sample_rate ),
33  fThread ( this ),
34  fAudioInterface ( buffer_size, sample_rate )
35  {
36  const JSList* node;
37  const jack_driver_param_t* param;
38 
39  fCaptureChannels = 2;
40  fPlaybackChannels = 2;
41 
42  fAudioInterface.fPeriod = 2;
43 
44  for ( node = params; node; node = jack_slist_next ( node ) )
45  {
46  param = ( const jack_driver_param_t* ) node->data;
47 
48  switch ( param->character )
49  {
50  case 'i':
51  fCaptureChannels = param->value.ui;
52  break;
53  case 'o':
54  fPlaybackChannels = param->value.ui;
55  break;
56  case 'C':
57  break;
58  case 'P':
59  break;
60  case 'D':
61  break;
62  case 'n':
63  fAudioInterface.fPeriod = param->value.ui;
64  break;
65  case 'd':
66  fAudioInterface.fCardName = strdup ( param->value.str );
67  break;
68  case 'r':
69  fAudioInterface.fFrequency = param->value.ui;
70  SetAdaptedSampleRate ( param->value.ui );
71  break;
72  case 'p':
73  fAudioInterface.fBuffering = param->value.ui;
74  SetAdaptedBufferSize ( param->value.ui );
75  break;
76  case 'q':
77  fQuality = param->value.ui;
78  break;
79  case 'g':
80  fRingbufferCurSize = param->value.ui;
81  fAdaptative = false;
82  break;
83  }
84  }
85 
86  fAudioInterface.setInputs ( fCaptureChannels );
87  fAudioInterface.setOutputs ( fPlaybackChannels );
88  }
89 
90  int JackAlsaAdapter::Open()
91  {
92  //open audio interface
93  if ( fAudioInterface.open() )
94  return -1;
95 
96  //start adapter thread
97  if ( fThread.StartSync() < 0 )
98  {
99  jack_error ( "Cannot start audioadapter thread" );
100  return -1;
101  }
102 
103  //display card info
104  fAudioInterface.longinfo();
105 
106  //turn the thread realtime
107  fThread.AcquireRealTime(GetEngineControl()->fClientPriority);
108  return 0;
109  }
110 
111  int JackAlsaAdapter::Close()
112  {
113 #ifdef JACK_MONITOR
114  fTable.Save(fHostBufferSize, fHostSampleRate, fAdaptedSampleRate, fAdaptedBufferSize);
115 #endif
116  switch ( fThread.GetStatus() )
117  {
118 
119  // Kill the thread in Init phase
120  case JackThread::kStarting:
121  case JackThread::kIniting:
122  if ( fThread.Kill() < 0 )
123  {
124  jack_error ( "Cannot kill thread" );
125  return -1;
126  }
127  break;
128 
129  // Stop when the thread cycle is finished
130  case JackThread::kRunning:
131  if ( fThread.Stop() < 0 )
132  {
133  jack_error ( "Cannot stop thread" );
134  return -1;
135  }
136  break;
137 
138  default:
139  break;
140  }
141  return fAudioInterface.close();
142  }
143 
145  {
146  //fill the hardware buffers
147  for ( unsigned int i = 0; i < fAudioInterface.fPeriod; i++ )
148  fAudioInterface.write();
149  return true;
150  }
151 
152  bool JackAlsaAdapter::Execute()
153  {
154  //read data from audio interface
155  if (fAudioInterface.read() < 0)
156  return false;
157 
158  PushAndPull(fAudioInterface.fInputSoftChannels, fAudioInterface.fOutputSoftChannels, fAdaptedBufferSize);
159 
160  //write data to audio interface
161  if (fAudioInterface.write() < 0)
162  return false;
163 
164  return true;
165  }
166 
167  int JackAlsaAdapter::SetSampleRate ( jack_nframes_t sample_rate )
168  {
169  JackAudioAdapterInterface::SetHostSampleRate ( sample_rate );
170  Close();
171  return Open();
172  }
173 
174  int JackAlsaAdapter::SetBufferSize ( jack_nframes_t buffer_size )
175  {
176  JackAudioAdapterInterface::SetHostBufferSize ( buffer_size );
177  Close();
178  return Open();
179  }
180 
181 } // namespace
182 
183 #ifdef __cplusplus
184 extern "C"
185 {
186 #endif
187 
188  SERVER_EXPORT jack_driver_desc_t* jack_get_descriptor()
189  {
190  jack_driver_desc_t * desc;
193 
194  desc = jack_driver_descriptor_construct("audioadapter", JackDriverNone, "netjack audio <==> net backend adapter", &filler);
195 
196  strcpy(value.str, "none");
197  jack_driver_descriptor_add_parameter(desc, &filler, "capture", 'C', JackDriverParamString, &value, NULL, "Provide capture ports. Optionally set device", NULL);
198  jack_driver_descriptor_add_parameter(desc, &filler, "playback", 'P', JackDriverParamString, &value, NULL, "Provide playback ports. Optionally set device", NULL);
199 
200  strcpy(value.str, "hw:0");
201  jack_driver_descriptor_add_parameter(desc, &filler, "device", 'd', JackDriverParamString, &value, NULL, "ALSA device name", NULL);
202 
203  value.ui = 48000U;
204  jack_driver_descriptor_add_parameter(desc, &filler, "rate", 'r', JackDriverParamUInt, &value, NULL, "Sample rate", NULL);
205 
206  value.ui = 512U;
207  jack_driver_descriptor_add_parameter(desc, &filler, "periodsize", 'p', JackDriverParamUInt, &value, NULL, "Period size", NULL);
208 
209  value.ui = 2U;
210  jack_driver_descriptor_add_parameter(desc, &filler, "nperiods", 'n', JackDriverParamUInt, &value, NULL, "Number of periods of playback latency", NULL);
211 
212  value.i = true;
213  jack_driver_descriptor_add_parameter(desc, &filler, "duplex", 'D', JackDriverParamBool, &value, NULL, "Provide both capture and playback ports", NULL);
214 
215  value.i = 0;
216  jack_driver_descriptor_add_parameter(desc, &filler, "in-channels", 'i', JackDriverParamInt, &value, NULL, "Number of capture channels (defaults to hardware max)", NULL);
217  jack_driver_descriptor_add_parameter(desc, &filler, "out-channels", 'o', JackDriverParamInt, &value, NULL, "Number of playback channels (defaults to hardware max)", NULL);
218 
219  value.ui = 0;
220  jack_driver_descriptor_add_parameter(desc, &filler, "quality", 'q', JackDriverParamUInt, &value, NULL, "Resample algorithm quality (0 - 4)", NULL);
221 
222  value.ui = 32768;
223  jack_driver_descriptor_add_parameter(desc, &filler, "ring-buffer", 'g', JackDriverParamUInt, &value, NULL, "Fixed ringbuffer size", "Fixed ringbuffer size (if not set => automatic adaptative)");
224 
225  return desc;
226  }
227 
228 #ifdef __cplusplus
229 }
230 #endif
231