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jack2/windows/JackPortAudioDriver.cpp

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  1. /*

  2. Copyright (C) 2004-2008 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. #ifdef WIN32

  25. #pragma warning (disable : 4786)

  26. #endif

  27. 

  28. #include "pa_asio.h"

  29. #include "JackDriverLoader.h"

  30. #include "driver_interface.h"

  31. #include "JackPortAudioDriver.h"

  32. #include "JackEngineControl.h"

  33. #include "JackError.h"

  34. #include "JackTime.h"

  35. #include "JackExports.h"

  36. #include <iostream>

  37. #include <assert.h>

  38. 

  39. namespace Jack

  40. {

  41. 

  42. void JackPortAudioDriver::PrintSupportedStandardSampleRates(const PaStreamParameters* inputParameters, const PaStreamParameters* outputParameters)

  43. {

  44.     static double standardSampleRates[] = {

  45.                                               8000.0, 9600.0, 11025.0, 12000.0, 16000.0, 22050.0, 24000.0, 32000.0,

  46.                                               44100.0, 48000.0, 88200.0, 96000.0, 192000.0, -1 /* negative terminated  list */

  47.                                           };

  48.     int i, printCount;

  49.     PaError err;

  50. 

  51.     printCount = 0;

  52.     for (i = 0; standardSampleRates[i] > 0; i++) {

  53.         err = Pa_IsFormatSupported(inputParameters, outputParameters, standardSampleRates[i]);

  54.         if (err == paFormatIsSupported) {

  55.             if (printCount == 0) {

  56.                 printf("\t%8.2f", standardSampleRates[i]);

  57.                 printCount = 1;

  58.             } else if (printCount == 4) {

  59.                 printf(",\n\t%8.2f", standardSampleRates[i]);

  60.                 printCount = 1;

  61.             } else {

  62.                 printf(", %8.2f", standardSampleRates[i]);

  63.                 ++printCount;

  64.             }

  65.         }

  66.     }

  67.     if (!printCount)

  68.         printf("None\n");

  69.     else

  70.         printf("\n");

  71. }

  72. 

  73. bool JackPortAudioDriver::GetInputDeviceFromName(const char* name, PaDeviceIndex* device, int* in_max)

  74. {

  75.     const PaDeviceInfo* deviceInfo;

  76.     PaDeviceIndex numDevices = Pa_GetDeviceCount();

  77. 

  78.     for (int i = 0; i < numDevices; i++) {

  79.         deviceInfo = Pa_GetDeviceInfo(i);

  80.         if (strcmp(name, deviceInfo->name) == 0) {

  81.             *device = i;

  82.             *in_max = deviceInfo->maxInputChannels;

  83.             return true;

  84.         }

  85.     }

  86. 

  87.     return false;

  88. }

  89. 

  90. bool JackPortAudioDriver::GetOutputDeviceFromName(const char* name, PaDeviceIndex* device, int* out_max)

  91. {

  92.     const PaDeviceInfo* deviceInfo;

  93.     PaDeviceIndex numDevices = Pa_GetDeviceCount();

  94. 

  95.     for (int i = 0; i < numDevices; i++) {

  96.         deviceInfo = Pa_GetDeviceInfo(i);

  97.         if (strcmp(name, deviceInfo->name) == 0) {

  98.             *device = i;

  99.             *out_max = deviceInfo->maxOutputChannels;

  100.             return true;

  101.         }

  102.     }

  103. 

  104.     return false;

  105. }

  106. 

  107. static void DisplayDeviceNames()

  108. {

  109.     PaError err;

  110.     const PaDeviceInfo* deviceInfo;

  111.     PaStreamParameters inputParameters, outputParameters;

  112.     int defaultDisplayed;

  113. 

  114.     err = Pa_Initialize();

  115.     if (err != paNoError)

  116.         return ;

  117. 

  118.     PaDeviceIndex numDevices = Pa_GetDeviceCount();

  119.     printf("Number of devices = %d\n", numDevices);

  120. 

  121.     for (int i = 0; i < numDevices; i++) {

  122.         deviceInfo = Pa_GetDeviceInfo(i);

  123.         printf( "--------------------------------------- device #%d\n", i );

  124. 

  125.         /* Mark global and API specific default devices */

  126.         defaultDisplayed = 0;

  127.         if (i == Pa_GetDefaultInputDevice()) {

  128.             printf("[ Default Input");

  129.             defaultDisplayed = 1;

  130.         } else if (i == Pa_GetHostApiInfo(deviceInfo->hostApi)->defaultInputDevice) {

  131.             const PaHostApiInfo *hostInfo = Pa_GetHostApiInfo(deviceInfo->hostApi);

  132.             printf("[ Default %s Input", hostInfo->name);

  133.             defaultDisplayed = 1;

  134.         }

  135. 

  136.         if (i == Pa_GetDefaultOutputDevice()) {

  137.             printf((defaultDisplayed ? "," : "["));

  138.             printf(" Default Output");

  139.             defaultDisplayed = 1;

  140.         } else if (i == Pa_GetHostApiInfo(deviceInfo->hostApi)->defaultOutputDevice) {

  141.             const PaHostApiInfo *hostInfo = Pa_GetHostApiInfo(deviceInfo->hostApi);

  142.             printf((defaultDisplayed ? "," : "["));

  143.             printf(" Default %s Output", hostInfo->name);

  144.             defaultDisplayed = 1;

  145.         }

  146. 

  147.         if (defaultDisplayed)

  148.             printf(" ]\n");

  149. 

  150.         /* print device info fields */

  151.         printf("Name                        = %s\n", deviceInfo->name);

  152.         printf("Host API                    = %s\n", Pa_GetHostApiInfo(deviceInfo->hostApi)->name);

  153.         printf("Max inputs = %d", deviceInfo->maxInputChannels);

  154.         printf(", Max outputs = %d\n", deviceInfo->maxOutputChannels);

  155.         /*

  156.               printf("Default low input latency   = %8.3f\n", deviceInfo->defaultLowInputLatency);

  157.               printf("Default low output latency  = %8.3f\n", deviceInfo->defaultLowOutputLatency);

  158.               printf("Default high input latency  = %8.3f\n", deviceInfo->defaultHighInputLatency);

  159.               printf("Default high output latency = %8.3f\n", deviceInfo->defaultHighOutputLatency);

  160.         */

  161. 

  162. #ifdef WIN32

  163. #ifndef PA_NO_ASIO

  164.         /* ASIO specific latency information */

  165.         if (Pa_GetHostApiInfo(deviceInfo->hostApi)->type == paASIO) {

  166.             long minLatency, maxLatency, preferredLatency, granularity;

  167. 

  168.             err = PaAsio_GetAvailableLatencyValues(i, &minLatency, &maxLatency, &preferredLatency, &granularity);

  169. 

  170.             printf("ASIO minimum buffer size    = %ld\n", minLatency);

  171.             printf("ASIO maximum buffer size    = %ld\n", maxLatency);

  172.             printf("ASIO preferred buffer size  = %ld\n", preferredLatency);

  173. 

  174.             if (granularity == -1)

  175.                 printf("ASIO buffer granularity     = power of 2\n");

  176.             else

  177.                 printf("ASIO buffer granularity     = %ld\n", granularity);

  178.         }

  179. #endif /* !PA_NO_ASIO */

  180. #endif /* WIN32 */

  181. 

  182.         printf("Default sample rate         = %8.2f\n", deviceInfo->defaultSampleRate);

  183. 

  184.         /* poll for standard sample rates */

  185.         inputParameters.device = i;

  186.         inputParameters.channelCount = deviceInfo->maxInputChannels;

  187.         inputParameters.sampleFormat = paInt16;

  188.         inputParameters.suggestedLatency = 0; /* ignored by Pa_IsFormatSupported() */

  189.         inputParameters.hostApiSpecificStreamInfo = NULL;

  190. 

  191.         outputParameters.device = i;

  192.         outputParameters.channelCount = deviceInfo->maxOutputChannels;

  193.         outputParameters.sampleFormat = paInt16;

  194.         outputParameters.suggestedLatency = 0; /* ignored by Pa_IsFormatSupported() */

  195.         outputParameters.hostApiSpecificStreamInfo = NULL;

  196. 

  197.         /*

  198.               if (inputParameters.channelCount > 0) {

  199.                   printf("Supported standard sample rates\n for half-duplex 16 bit %d channel input = \n", inputParameters.channelCount);

  200.                   PrintSupportedStandardSampleRates(&inputParameters, NULL);

  201.               }

  202. 

  203.               if (outputParameters.channelCount > 0) {

  204.                   printf("Supported standard sample rates\n for half-duplex 16 bit %d channel output = \n", outputParameters.channelCount);

  205.                   PrintSupportedStandardSampleRates(NULL, &outputParameters);

  206.               }

  207. 

  208.               if (inputParameters.channelCount > 0 && outputParameters.channelCount > 0) {

  209.                   printf("Supported standard sample rates\n for full-duplex 16 bit %d channel input, %d channel output = \n",

  210.                           inputParameters.channelCount, outputParameters.channelCount );

  211.                   PrintSupportedStandardSampleRates(&inputParameters, &outputParameters);

  212.               }

  213.         */

  214.     }

  215. 

  216.     Pa_Terminate();

  217. }

  218. 

  219. int JackPortAudioDriver::Render(const void* inputBuffer, void* outputBuffer,

  220.                                 unsigned long framesPerBuffer,

  221.                                 const PaStreamCallbackTimeInfo* timeInfo,

  222.                                 PaStreamCallbackFlags statusFlags,

  223.                                 void* userData)

  224. {

  225.     JackPortAudioDriver* driver = (JackPortAudioDriver*)userData;

  226.     driver->fInputBuffer = (float**)inputBuffer;

  227.     driver->fOutputBuffer = (float**)outputBuffer;

  228.     // Setup threadded based log function

  229.     set_threaded_log_function();

  230.     driver->CycleTakeBeginTime();

  231.     return (driver->Process() == 0) ? paContinue : paAbort;

  232. }

  233. 

  234. int JackPortAudioDriver::Read()

  235. {

  236.     for (int i = 0; i < fCaptureChannels; i++) {

  237.         memcpy(GetInputBuffer(i), fInputBuffer[i], sizeof(float) * fEngineControl->fBufferSize);

  238.     }

  239.     return 0;

  240. }

  241. 

  242. int JackPortAudioDriver::Write()

  243. {

  244.     for (int i = 0; i < fPlaybackChannels; i++) {

  245.         memcpy(fOutputBuffer[i], GetOutputBuffer(i), sizeof(float) * fEngineControl->fBufferSize);

  246.     }

  247.     return 0;

  248. }

  249. 

  250. int JackPortAudioDriver::Open(jack_nframes_t nframes,

  251.                               jack_nframes_t samplerate,

  252.                               bool capturing,

  253.                               bool playing,

  254.                               int inchannels,

  255.                               int outchannels,

  256.                               bool monitor,

  257.                               const char* capture_driver_uid,

  258.                               const char* playback_driver_uid,

  259.                               jack_nframes_t capture_latency,

  260.                               jack_nframes_t playback_latency)

  261. {

  262.     PaError err;

  263.     PaStreamParameters inputParameters;

  264.     PaStreamParameters outputParameters;

  265.     const PaDeviceInfo* deviceInfo;

  266.     int in_max = 0;

  267.     int out_max = 0;

  268. 

  269.     jack_log("JackPortAudioDriver::Open nframes = %ld in = %ld out = %ld capture name = %s playback name = %s samplerate = %ld",

  270.             nframes, inchannels, outchannels, capture_driver_uid, playback_driver_uid, samplerate);

  271. 

  272.     // Generic JackAudioDriver Open

  273.     if (JackAudioDriver::Open(nframes, samplerate, capturing, playing, inchannels, outchannels, monitor, capture_driver_uid, playback_driver_uid, capture_latency, playback_latency) != 0) {

  274.         return -1;

  275.     }

  276. 

  277.     err = Pa_Initialize();

  278.     if (err != paNoError) {

  279.         jack_error("JackPortAudioDriver::Pa_Initialize error = %s\n", Pa_GetErrorText(err));

  280.         goto error;

  281.     }

  282. 

  283.     jack_log("JackPortAudioDriver::Pa_GetDefaultInputDevice %ld", Pa_GetDefaultInputDevice());

  284.     jack_log("JackPortAudioDriver::Pa_GetDefaultOutputDevice %ld", Pa_GetDefaultOutputDevice());

  285. 

  286.     if (capturing) {

  287.         if (!GetInputDeviceFromName(capture_driver_uid, &fInputDevice, &in_max)) {

  288.             jack_log("JackPortAudioDriver::GetInputDeviceFromName cannot open %s", capture_driver_uid);

  289.             fInputDevice = Pa_GetDefaultInputDevice();

  290.             if (fInputDevice == paNoDevice)

  291.                 goto error;

  292.             deviceInfo = Pa_GetDeviceInfo(fInputDevice);

  293.             in_max = deviceInfo->maxInputChannels;

  294.             capture_driver_uid = strdup(deviceInfo->name);

  295.         }

  296.     }

  297. 

  298.     if (inchannels > in_max) {

  299.         jack_error("This device hasn't required input channels inchannels = %ld in_max = %ld", inchannels, in_max);

  300.         goto error;

  301.     }

  302. 

  303.     if (playing) {

  304.         if (!GetOutputDeviceFromName(playback_driver_uid, &fOutputDevice, &out_max)) {

  305.             jack_log("JackPortAudioDriver::GetOutputDeviceFromName cannot open %s", playback_driver_uid);

  306.             fOutputDevice = Pa_GetDefaultOutputDevice();

  307.             if (fOutputDevice == paNoDevice)

  308.                 goto error;

  309.             deviceInfo = Pa_GetDeviceInfo(fOutputDevice);

  310.             out_max = deviceInfo->maxOutputChannels;

  311.             playback_driver_uid = strdup(deviceInfo->name);

  312.         }

  313.     }

  314. 

  315.     if (outchannels > out_max) {

  316.         jack_error("This device hasn't required output channels outchannels = %ld out_max = %ld", outchannels, out_max);

  317.         goto error;

  318.     }

  319. 

  320.     if (inchannels == 0) {

  321.         jack_log("JackPortAudioDriver::Open setup max in channels = %ld", in_max);

  322.         inchannels = in_max;

  323.     }

  324. 

  325.     if (outchannels == 0) {

  326.         jack_log("JackPortAudioDriver::Open setup max out channels = %ld", out_max);

  327.         outchannels = out_max;

  328.     }

  329. 

  330.     inputParameters.device = fInputDevice;

  331.     inputParameters.channelCount = inchannels;

  332.     inputParameters.sampleFormat = paFloat32 | paNonInterleaved;		// 32 bit floating point output

  333.     inputParameters.suggestedLatency = (fInputDevice != paNoDevice)		// TODO: check how to setup this on ASIO

  334.                                        ? Pa_GetDeviceInfo(inputParameters.device)->defaultLowInputLatency

  335.                                        : 0;

  336.     inputParameters.hostApiSpecificStreamInfo = NULL;

  337. 

  338.     outputParameters.device = fOutputDevice;

  339.     outputParameters.channelCount = outchannels;

  340.     outputParameters.sampleFormat = paFloat32 | paNonInterleaved;		// 32 bit floating point output

  341.     outputParameters.suggestedLatency = (fOutputDevice != paNoDevice)	// TODO: check how to setup this on ASIO

  342.                                         ? Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency

  343.                                         : 0;

  344.     outputParameters.hostApiSpecificStreamInfo = NULL;

  345. 

  346.     err = Pa_OpenStream(&fStream,

  347.                         (fInputDevice == paNoDevice) ? 0 : &inputParameters,

  348.                         (fOutputDevice == paNoDevice) ? 0 : &outputParameters,

  349.                         samplerate,

  350.                         nframes,

  351.                         paNoFlag,  // Clipping is on...

  352.                         Render,

  353.                         this);

  354.     if (err != paNoError) {

  355.         jack_error("Pa_OpenStream error = %s\n", Pa_GetErrorText(err));

  356.         goto error;

  357.     }

  358. 

  359. #ifdef __APPLE__

  360.     fEngineControl->fPeriod = fEngineControl->fPeriodUsecs * 1000;

  361.     fEngineControl->fComputation = 500 * 1000;

  362.     fEngineControl->fConstraint = fEngineControl->fPeriodUsecs * 1000;

  363. #endif

  364. 

  365.     // Core driver may have changed the in/out values

  366.     fCaptureChannels = inchannels;

  367.     fPlaybackChannels = outchannels;

  368. 

  369.     assert(strlen(capture_driver_uid) < JACK_CLIENT_NAME_SIZE);

  370.     assert(strlen(playback_driver_uid) < JACK_CLIENT_NAME_SIZE);

  371. 

  372.     strcpy(fCaptureDriverName, capture_driver_uid);

  373.     strcpy(fPlaybackDriverName, playback_driver_uid);

  374. 

  375.     return 0;

  376. 

  377. error:

  378.     Pa_Terminate();

  379.     return -1;

  380. }

  381. 

  382. int JackPortAudioDriver::Close()

  383. {

  384.     JackAudioDriver::Close();

  385.     jack_log("JackPortAudioDriver::Close");

  386.     Pa_CloseStream(fStream);

  387.     Pa_Terminate();

  388.     return 0;

  389. }

  390. 

  391. int JackPortAudioDriver::Start()

  392. {

  393.     jack_log("JackPortAudioDriver::Start");

  394.     JackAudioDriver::Start();

  395.     PaError err = Pa_StartStream(fStream);

  396.     return (err == paNoError) ? 0 : -1;

  397. }

  398. 

  399. int JackPortAudioDriver::Stop()

  400. {

  401.     jack_log("JackPortAudioDriver::Stop");

  402.     PaError err = Pa_StopStream(fStream);

  403.     return (err == paNoError) ? 0 : -1;

  404. }

  405. 

  406. int JackPortAudioDriver::SetBufferSize(jack_nframes_t buffer_size)

  407. {

  408.     PaError err;

  409.     PaStreamParameters inputParameters;

  410.     PaStreamParameters outputParameters;

  411. 

  412.     if ((err = Pa_CloseStream(fStream)) != paNoError) {

  413.         jack_error("Pa_CloseStream error = %s\n", Pa_GetErrorText(err));

  414.         return -1;

  415.     }

  416. 

  417.     inputParameters.device = fInputDevice;

  418.     inputParameters.channelCount = fCaptureChannels;

  419.     inputParameters.sampleFormat = paFloat32 | paNonInterleaved;		// 32 bit floating point output

  420.     inputParameters.suggestedLatency = (fInputDevice != paNoDevice)		// TODO: check how to setup this on ASIO

  421.                                        ? Pa_GetDeviceInfo(inputParameters.device)->defaultLowInputLatency

  422.                                        : 0;

  423.     inputParameters.hostApiSpecificStreamInfo = NULL;

  424. 

  425.     outputParameters.device = fOutputDevice;

  426.     outputParameters.channelCount = fPlaybackChannels;

  427.     outputParameters.sampleFormat = paFloat32 | paNonInterleaved;		// 32 bit floating point output

  428.     outputParameters.suggestedLatency = (fOutputDevice != paNoDevice)	// TODO: check how to setup this on ASIO

  429.                                         ? Pa_GetDeviceInfo(outputParameters.device)->defaultLowOutputLatency

  430.                                         : 0;

  431.     outputParameters.hostApiSpecificStreamInfo = NULL;

  432. 

  433.     err = Pa_OpenStream(&fStream,

  434.                         (fInputDevice == paNoDevice) ? 0 : &inputParameters,

  435.                         (fOutputDevice == paNoDevice) ? 0 : &outputParameters,

  436.                         fEngineControl->fSampleRate,

  437.                         buffer_size,

  438.                         paNoFlag,  // Clipping is on...

  439.                         Render,

  440.                         this);

  441. 

  442.     if (err != paNoError) {

  443.         jack_error("Pa_OpenStream error = %s\n", Pa_GetErrorText(err));

  444.         return -1;

  445.     } else {

  446.         // Only done when success

  447.         return JackAudioDriver::SetBufferSize(buffer_size); // never fails

  448.     }

  449. }

  450. 

  451. } // end of namespace

  452. 

  453. #ifdef __cplusplus

  454. extern "C"

  455. {

  456. #endif

  457. 

  458. #include "JackExports.h"

  459. 

  460.     EXPORT jack_driver_desc_t* driver_get_descriptor() {

  461.         jack_driver_desc_t *desc;

  462.         unsigned int i;

  463.         desc = (jack_driver_desc_t*)calloc(1, sizeof(jack_driver_desc_t));

  464. 

  465.         strcpy(desc->name, "portaudio");

  466. 

  467.         desc->nparams = 13;

  468.         desc->params = (jack_driver_param_desc_t*)calloc(desc->nparams, sizeof(jack_driver_param_desc_t));

  469. 

  470.         i = 0;

  471.         strcpy(desc->params[i].name, "channels");

  472.         desc->params[i].character = 'c';

  473.         desc->params[i].type = JackDriverParamInt;

  474.         desc->params[i].value.ui = 0;

  475.         strcpy(desc->params[i].short_desc, "Maximum number of channels");

  476.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  477. 

  478.         i++;

  479.         strcpy(desc->params[i].name, "inchannels");

  480.         desc->params[i].character = 'i';

  481.         desc->params[i].type = JackDriverParamInt;

  482.         desc->params[i].value.ui = 0;

  483.         strcpy(desc->params[i].short_desc, "Maximum number of input channels");

  484.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  485. 

  486.         i++;

  487.         strcpy(desc->params[i].name, "outchannels");

  488.         desc->params[i].character = 'o';

  489.         desc->params[i].type = JackDriverParamInt;

  490.         desc->params[i].value.ui = 0;

  491.         strcpy(desc->params[i].short_desc, "Maximum number of output channels");

  492.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  493. 

  494.         i++;

  495.         strcpy(desc->params[i].name, "capture");

  496.         desc->params[i].character = 'C';

  497.         desc->params[i].type = JackDriverParamString;

  498.         strcpy(desc->params[i].value.str, "will take default PortAudio input device");

  499.         strcpy(desc->params[i].short_desc, "Provide capture ports. Optionally set PortAudio device name");

  500.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  501. 

  502.         i++;

  503.         strcpy(desc->params[i].name, "playback");

  504.         desc->params[i].character = 'P';

  505.         desc->params[i].type = JackDriverParamString;

  506.         strcpy(desc->params[i].value.str, "will take default PortAudio output device");

  507.         strcpy(desc->params[i].short_desc, "Provide playback ports. Optionally set PortAudio device name");

  508.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  509. 

  510.         i++;

  511.         strcpy (desc->params[i].name, "monitor");

  512.         desc->params[i].character = 'm';

  513.         desc->params[i].type = JackDriverParamBool;

  514.         desc->params[i].value.i = 0;

  515.         strcpy(desc->params[i].short_desc, "Provide monitor ports for the output");

  516.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  517. 

  518.         i++;

  519.         strcpy(desc->params[i].name, "duplex");

  520.         desc->params[i].character = 'D';

  521.         desc->params[i].type = JackDriverParamBool;

  522.         desc->params[i].value.i = TRUE;

  523.         strcpy(desc->params[i].short_desc, "Provide both capture and playback ports");

  524.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  525. 

  526.         i++;

  527.         strcpy(desc->params[i].name, "rate");

  528.         desc->params[i].character = 'r';

  529.         desc->params[i].type = JackDriverParamUInt;

  530.         desc->params[i].value.ui = 44100U;

  531.         strcpy(desc->params[i].short_desc, "Sample rate");

  532.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  533. 

  534.         i++;

  535.         strcpy(desc->params[i].name, "period");

  536.         desc->params[i].character = 'p';

  537.         desc->params[i].type = JackDriverParamUInt;

  538.         desc->params[i].value.ui = 128U;

  539.         strcpy(desc->params[i].short_desc, "Frames per period");

  540.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  541. 

  542.         i++;

  543.         strcpy(desc->params[i].name, "device");

  544.         desc->params[i].character = 'd';

  545.         desc->params[i].type = JackDriverParamString;

  546.         desc->params[i].value.ui = 128U;

  547.         strcpy(desc->params[i].value.str, "will take default PortAudio device name");

  548.         strcpy(desc->params[i].short_desc, "PortAudio device name");

  549.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  550. 

  551.         i++;

  552.         strcpy(desc->params[i].name, "input-latency");

  553.         desc->params[i].character = 'I';

  554.         desc->params[i].type = JackDriverParamUInt;

  555.         desc->params[i].value.i = 0;

  556.         strcpy(desc->params[i].short_desc, "Extra input latency");

  557.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  558. 

  559.         i++;

  560.         strcpy(desc->params[i].name, "output-latency");

  561.         desc->params[i].character = 'O';

  562.         desc->params[i].type = JackDriverParamUInt;

  563.         desc->params[i].value.i = 0;

  564.         strcpy(desc->params[i].short_desc, "Extra output latency");

  565.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  566. 

  567.         i++;

  568.         strcpy(desc->params[i].name, "list-devices");

  569.         desc->params[i].character = 'l';

  570.         desc->params[i].type = JackDriverParamBool;

  571.         desc->params[i].value.i = TRUE;

  572.         strcpy(desc->params[i].short_desc, "Display available PortAudio devices");

  573.         strcpy(desc->params[i].long_desc, desc->params[i].short_desc);

  574. 

  575.         return desc;

  576.     }

  577. 

  578.     EXPORT Jack::JackDriverClientInterface* driver_initialize(Jack::JackLockedEngine* engine, Jack::JackSynchro* table, const JSList* params) {

  579.         jack_nframes_t srate = 44100;

  580.         jack_nframes_t frames_per_interrupt = 512;

  581.         int capture = FALSE;

  582.         int playback = FALSE;

  583.         int chan_in = 0;

  584.         int chan_out = 0;

  585.         bool monitor = false;

  586.         char* capture_pcm_name = "winmme";

  587.         char* playback_pcm_name = "winmme";

  588.         const JSList *node;

  589.         const jack_driver_param_t *param;

  590.         jack_nframes_t systemic_input_latency = 0;

  591.         jack_nframes_t systemic_output_latency = 0;

  592. 

  593.         for (node = params; node; node = jack_slist_next(node)) {

  594.             param = (const jack_driver_param_t *) node->data;

  595. 

  596.             switch (param->character) {

  597. 

  598.                 case 'd':

  599.                     capture_pcm_name = strdup(param->value.str);

  600.                     playback_pcm_name = strdup(param->value.str);

  601.                     break;

  602. 

  603.                 case 'D':

  604.                     capture = TRUE;

  605.                     playback = TRUE;

  606.                     break;

  607. 

  608.                 case 'c':

  609.                     chan_in = chan_out = (int) param->value.ui;

  610.                     break;

  611. 

  612.                 case 'i':

  613.                     chan_in = (int) param->value.ui;

  614.                     break;

  615. 

  616.                 case 'o':

  617.                     chan_out = (int) param->value.ui;

  618.                     break;

  619. 

  620.                 case 'C':

  621.                     capture = TRUE;

  622.                     if (strcmp(param->value.str, "none") != 0) {

  623.                         capture_pcm_name = strdup(param->value.str);

  624.                     }

  625.                     break;

  626. 

  627.                 case 'P':

  628.                     playback = TRUE;

  629.                     if (strcmp(param->value.str, "none") != 0) {

  630.                         playback_pcm_name = strdup(param->value.str);

  631.                     }

  632.                     break;

  633. 

  634.                 case 'm':

  635.                     monitor = param->value.i;

  636.                     break;

  637. 

  638.                 case 'r':

  639.                     srate = param->value.ui;

  640.                     break;

  641. 

  642.                 case 'p':

  643.                     frames_per_interrupt = (unsigned int) param->value.ui;

  644.                     break;

  645. 

  646.                 case 'I':

  647.                     systemic_input_latency = param->value.ui;

  648.                     break;

  649. 

  650.                 case 'O':

  651.                     systemic_output_latency = param->value.ui;

  652.                     break;

  653. 

  654.                 case 'l':

  655.                     Jack::DisplayDeviceNames();

  656.                     break;

  657.             }

  658.         }

  659. 

  660.         // duplex is the default

  661.         if (!capture && !playback) {

  662.             capture = TRUE;

  663.             playback = TRUE;

  664.         }

  665. 

  666.         Jack::JackDriverClientInterface* driver = new Jack::JackPortAudioDriver("system", "portaudio", engine, table);

  667.         if (driver->Open(frames_per_interrupt, srate, capture, playback, chan_in, chan_out, monitor, capture_pcm_name, playback_pcm_name, systemic_input_latency, systemic_output_latency) == 0) {

  668.             return driver;

  669.         } else {

  670.             delete driver;

  671.             return NULL;

  672.         }

  673.     }

  674. 

  675. #ifdef __cplusplus

  676. }

  677. #endif