libs/backends/portaudio/portaudio_io.cc

   1 /*
   2  * Copyright (C) 2015 Robin Gareus <robin@gareus.org>
   3  * Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <assert.h>
  24 #include <glibmm.h>
  25
  26 #include "portaudio_io.h"
  27
  28 #ifdef WITH_ASIO
  29 #include "pa_asio.h"
  30 #endif
  31
  32 #include "pbd/compose.h"
  33
  34 #include "ardour/audio_backend.h"
  35
  36 #include "debug.h"
  37
  38 #define INTERLEAVED_INPUT
  39 #define INTERLEAVED_OUTPUT
  40
  41 using namespace PBD;
  42 using namespace ARDOUR;
  43
  44 PortAudioIO::PortAudioIO ()
  45         : _capture_channels (0)
  46         , _playback_channels (0)
  47         , _stream (0)
  48         , _input_buffer (0)
  49         , _output_buffer (0)
  50         , _cur_sample_rate (0)
  51         , _cur_input_latency (0)
  52         , _cur_output_latency (0)
  53         , _host_api_index(-1)
  54 {
  55 }
  56
  57 PortAudioIO::~PortAudioIO ()
  58 {
  59         pcm_stop();
  60
  61         pa_deinitialize ();
  62         clear_device_lists ();
  63
  64         free (_input_buffer); _input_buffer = NULL;
  65         free (_output_buffer); _output_buffer = NULL;
  66 }
  67
  68 std::string
  69 PortAudioIO::control_app_name (int device_id) const
  70 {
  71 #ifdef WITH_ASIO
  72         if (get_current_host_api_type() == paASIO) {
  73                 // is this used for anything, or just acts as a boolean?
  74                 return "PortaudioASIO";
  75         }
  76 #endif
  77
  78         return std::string();
  79 }
  80
  81 void
  82 PortAudioIO::launch_control_app (int device_id)
  83 {
  84 #ifdef WITH_ASIO
  85         PaError err = PaAsio_ShowControlPanel (device_id, NULL);
  86
  87         if (err != paNoError) {
  88                 // error << ?
  89                 DEBUG_AUDIO (string_compose (
  90                     "Unable to show control panel for device with index %1\n", device_id));
  91         }
  92 #endif
  93 }
  94
  95 void
  96 PortAudioIO::get_default_sample_rates (std::vector<float>& rates)
  97 {
  98         rates.push_back(8000.0);
  99         rates.push_back(22050.0);
 100         rates.push_back(24000.0);
 101         rates.push_back(44100.0);
 102         rates.push_back(48000.0);
 103         rates.push_back(88200.0);
 104         rates.push_back(96000.0);
 105         rates.push_back(176400.0);
 106         rates.push_back(192000.0);
 107 }
 108
 109 int
 110 PortAudioIO::available_sample_rates(int device_id, std::vector<float>& sampleRates)
 111 {
 112         if (!pa_initialize()) return -1;
 113
 114 #ifdef WITH_ASIO
 115         if (get_current_host_api_type() == paASIO) {
 116                 get_default_sample_rates(sampleRates);
 117                 return 0;
 118         }
 119 #endif
 120
 121         // TODO use  separate int device_input, int device_output ?!
 122         if (device_id == DeviceDefault) {
 123                 device_id = get_default_input_device ();
 124         }
 125
 126         DEBUG_AUDIO (
 127             string_compose ("Querying Samplerates for device %1\n", device_id));
 128
 129         sampleRates.clear();
 130         const PaDeviceInfo* nfo = Pa_GetDeviceInfo(device_id);
 131
 132         if (nfo) {
 133                 PaStreamParameters inputParam;
 134                 PaStreamParameters outputParam;
 135
 136                 inputParam.device = device_id;
 137                 inputParam.channelCount = nfo->maxInputChannels;
 138                 inputParam.sampleFormat = paFloat32;
 139                 inputParam.suggestedLatency = 0;
 140                 inputParam.hostApiSpecificStreamInfo = 0;
 141
 142                 outputParam.device = device_id;
 143                 outputParam.channelCount = nfo->maxOutputChannels;
 144                 outputParam.sampleFormat = paFloat32;
 145                 outputParam.suggestedLatency = 0;
 146                 outputParam.hostApiSpecificStreamInfo = 0;
 147
 148                 std::vector<float> rates;
 149                 get_default_sample_rates(rates);
 150
 151                 for (std::vector<float>::const_iterator i = rates.begin(); i != rates.end();
 152                      ++i) {
 153                         if (paFormatIsSupported ==
 154                             Pa_IsFormatSupported(nfo->maxInputChannels > 0 ? &inputParam : NULL,
 155                                                  nfo->maxOutputChannels > 0 ? &outputParam : NULL,
 156                                                  *i)) {
 157                                 sampleRates.push_back(*i);
 158                         }
 159                 }
 160         }
 161
 162         if (sampleRates.empty()) {
 163                 // fill in something..
 164                 get_default_sample_rates(sampleRates);
 165         }
 166
 167         return 0;
 168 }
 169
 170 #ifdef WITH_ASIO
 171 bool
 172 PortAudioIO::get_asio_buffer_properties (int device_id,
 173                                          long& min_size_frames,
 174                                          long& max_size_frames,
 175                                          long& preferred_size_frames,
 176                                          long& granularity)
 177 {
 178         // we shouldn't really need all these checks but it shouldn't hurt
 179         const PaDeviceInfo* device_info = Pa_GetDeviceInfo(device_id);
 180
 181         if (!device_info) {
 182                 DEBUG_AUDIO (string_compose (
 183                     "Unable to get device info from device index %1\n", device_id));
 184                 return false;
 185         }
 186
 187         if (get_current_host_api_type() != paASIO) {
 188                 DEBUG_AUDIO (string_compose (
 189                     "ERROR device_id %1 is not an ASIO device\n", device_id));
 190                 return false;
 191         }
 192
 193         PaError err = PaAsio_GetAvailableBufferSizes (device_id,
 194                                                       &min_size_frames,
 195                                                       &max_size_frames,
 196                                                       &preferred_size_frames,
 197                                                       &granularity);
 198
 199         if (err != paNoError) {
 200                 DEBUG_AUDIO (string_compose (
 201                     "Unable to determine available buffer sizes for device %1\n", device_id));
 202                 return false;
 203         }
 204         return true;
 205 }
 206
 207 bool
 208 PortAudioIO::get_asio_buffer_sizes (int device_id, std::vector<uint32_t>& buffer_sizes)
 209 {
 210         long min_size_frames = 0;
 211         long max_size_frames = 0;
 212         long preferred_size_frames = 0;
 213         long granularity = 0;
 214
 215         if (!get_asio_buffer_properties (device_id,
 216                                          min_size_frames,
 217                                          max_size_frames,
 218                                          preferred_size_frames,
 219                                          granularity)) {
 220                 DEBUG_AUDIO (string_compose (
 221                     "Unable to get device buffer properties from device index %1\n", device_id));
 222                 return false;
 223         }
 224
 225         DEBUG_AUDIO (string_compose ("ASIO buffer properties for device %1, "
 226                                      "min_size_frames: %2, max_size_frames: %3, "
 227                                      "preferred_size_frames: %4, granularity: %5\n",
 228                                      device_id,
 229                                      min_size_frames,
 230                                      max_size_frames,
 231                                      preferred_size_frames,
 232                                      granularity));
 233
 234 #ifdef USE_ASIO_MIN_MAX_BUFFER_SIZES
 235         if (min_size_frames >= max_size_frames) {
 236                 buffer_sizes.push_back (preferred_size_frames);
 237                 return true;
 238         }
 239
 240         long buffer_size = min_size_frames;
 241         while (buffer_size <= max_size_frames) {
 242                 buffer_sizes.push_back (buffer_size);
 243
 244                 if (granularity <= 0) {
 245                         // buffer sizes are power of 2
 246                         buffer_size = buffer_size * 2;
 247                 } else {
 248                         buffer_size += granularity;
 249                 }
 250         }
 251 #else
 252         buffer_sizes.push_back (preferred_size_frames);
 253 #endif
 254         return true;
 255 }
 256 #endif
 257
 258 void
 259 PortAudioIO::get_default_buffer_sizes(std::vector<uint32_t>& buffer_sizes)
 260 {
 261         buffer_sizes.push_back(64);
 262         buffer_sizes.push_back(128);
 263         buffer_sizes.push_back(256);
 264         buffer_sizes.push_back(512);
 265         buffer_sizes.push_back(1024);
 266         buffer_sizes.push_back(2048);
 267         buffer_sizes.push_back(4096);
 268 }
 269
 270 int
 271 PortAudioIO::available_buffer_sizes(int device_id, std::vector<uint32_t>& buffer_sizes)
 272 {
 273 #ifdef WITH_ASIO
 274         if (get_current_host_api_type() == paASIO) {
 275                 if (get_asio_buffer_sizes (device_id, buffer_sizes)) {
 276                         return 0;
 277                 }
 278         }
 279 #endif
 280
 281         get_default_buffer_sizes (buffer_sizes);
 282
 283         return 0;
 284 }
 285
 286 void
 287 PortAudioIO::input_device_list(std::map<int, std::string> &devices) const
 288 {
 289         for (std::map<int, paDevice*>::const_iterator i = _input_devices.begin ();
 290              i != _input_devices.end ();
 291              ++i) {
 292                 devices.insert (std::pair<int, std::string>(i->first, Glib::locale_to_utf8(i->second->name)));
 293         }
 294 }
 295
 296 void
 297 PortAudioIO::output_device_list(std::map<int, std::string> &devices) const
 298 {
 299         for (std::map<int, paDevice*>::const_iterator i = _output_devices.begin ();
 300              i != _output_devices.end ();
 301              ++i) {
 302                 devices.insert (std::pair<int, std::string>(i->first, Glib::locale_to_utf8(i->second->name)));
 303         }
 304 }
 305
 306 bool&
 307 PortAudioIO::pa_initialized()
 308 {
 309         static bool s_initialized = false;
 310         return s_initialized;
 311 }
 312
 313 bool
 314 PortAudioIO::pa_initialize()
 315 {
 316         if (pa_initialized()) return true;
 317
 318         PaError err = Pa_Initialize();
 319         if (err != paNoError) {
 320                 return false;
 321         }
 322         pa_initialized() = true;
 323
 324         return true;
 325 }
 326
 327 bool
 328 PortAudioIO::pa_deinitialize()
 329 {
 330         if (!pa_initialized()) return true;
 331
 332         PaError err = Pa_Terminate();
 333         if (err != paNoError) {
 334                 return false;
 335         }
 336         pa_initialized() = false;
 337         return true;
 338 }
 339
 340 void
 341 PortAudioIO::host_api_list (std::vector<std::string>& api_list)
 342 {
 343         if (!pa_initialize()) return;
 344
 345         PaHostApiIndex count = Pa_GetHostApiCount();
 346
 347         if (count < 0) return;
 348
 349         for (int i = 0; i < count; ++i) {
 350                 const PaHostApiInfo* info = Pa_GetHostApiInfo (i);
 351                 if (info->name != NULL) { // possible?
 352                         api_list.push_back (info->name);
 353                 }
 354         }
 355 }
 356
 357
 358 PaHostApiTypeId
 359 PortAudioIO::get_current_host_api_type () const
 360 {
 361         const PaHostApiInfo* info = Pa_GetHostApiInfo (_host_api_index);
 362
 363         if (info == NULL) {
 364                 DEBUG_AUDIO(string_compose(
 365                     "Unable to determine Host API type from index %1\n", _host_api_index));
 366                 return (PaHostApiTypeId)0;
 367         }
 368
 369         return info->type;
 370 }
 371
 372 std::string
 373 PortAudioIO::get_host_api_name_from_index (PaHostApiIndex index)
 374 {
 375         std::vector<std::string> api_list;
 376         host_api_list(api_list);
 377         return api_list[index];
 378 }
 379
 380 bool
 381 PortAudioIO::set_host_api (const std::string& host_api_name)
 382 {
 383         PaHostApiIndex new_index = get_host_api_index_from_name (host_api_name);
 384
 385         if (new_index < 0) {
 386                 DEBUG_AUDIO ("Portaudio: Error setting host API\n");
 387                 return false;
 388         }
 389         _host_api_index = new_index;
 390         _host_api_name = host_api_name;
 391         return true;
 392 }
 393
 394 PaHostApiIndex
 395 PortAudioIO::get_host_api_index_from_name (const std::string& name)
 396 {
 397         if (!pa_initialize()) return -1;
 398
 399         PaHostApiIndex count = Pa_GetHostApiCount();
 400
 401         if (count < 0) {
 402                 DEBUG_AUDIO ("Host API count < 0\n");
 403                 return -1;
 404         }
 405
 406         for (int i = 0; i < count; ++i) {
 407                 const PaHostApiInfo* info = Pa_GetHostApiInfo (i);
 408                 if (info != NULL && info->name != NULL) { // possible?
 409                         if (name == info->name) {
 410                                 return i;
 411                         }
 412                 }
 413         }
 414         DEBUG_AUDIO (string_compose ("Unable to get host API from name: %1\n", name));
 415
 416         return -1;
 417 }
 418
 419 PaDeviceIndex
 420 PortAudioIO::get_default_input_device () const
 421 {
 422         const PaHostApiInfo* info = Pa_GetHostApiInfo (_host_api_index);
 423         if (info == NULL) return -1;
 424         return info->defaultInputDevice;
 425 }
 426
 427 PaDeviceIndex
 428 PortAudioIO::get_default_output_device () const
 429 {
 430         const PaHostApiInfo* info = Pa_GetHostApiInfo (_host_api_index);
 431         if (info == NULL) return -1;
 432         return info->defaultOutputDevice;
 433 }
 434
 435 void
 436 PortAudioIO::clear_device_lists ()
 437 {
 438         for (std::map<int, paDevice*>::const_iterator i = _input_devices.begin (); i != _input_devices.end(); ++i) {
 439                 delete i->second;
 440         }
 441         _input_devices.clear();
 442
 443         for (std::map<int, paDevice*>::const_iterator i = _output_devices.begin (); i != _output_devices.end(); ++i) {
 444                 delete i->second;
 445         }
 446         _output_devices.clear();
 447 }
 448
 449 void
 450 PortAudioIO::add_none_devices ()
 451 {
 452         _input_devices.insert(std::pair<int, paDevice*>(
 453             DeviceNone, new paDevice(AudioBackend::get_standard_device_name(AudioBackend::DeviceNone), 0, 0)));
 454         _output_devices.insert(std::pair<int, paDevice*>(
 455             DeviceNone, new paDevice(AudioBackend::get_standard_device_name(AudioBackend::DeviceNone), 0, 0)));
 456 }
 457
 458 void
 459 PortAudioIO::add_default_devices ()
 460 {
 461         const PaHostApiInfo* info = Pa_GetHostApiInfo (_host_api_index);
 462         if (info == NULL) return;
 463
 464         const PaDeviceInfo* nfo_i = Pa_GetDeviceInfo(get_default_input_device());
 465         const PaDeviceInfo* nfo_o = Pa_GetDeviceInfo(get_default_output_device());
 466         if (nfo_i && nfo_o) {
 467                 _input_devices.insert (std::pair<int, paDevice*> (DeviceDefault,
 468                                         new paDevice(AudioBackend::get_standard_device_name(AudioBackend::DeviceDefault),
 469                                                 nfo_i->maxInputChannels,
 470                                                 nfo_o->maxOutputChannels
 471                                                 )));
 472                 _output_devices.insert (std::pair<int, paDevice*> (DeviceDefault,
 473                                         new paDevice(AudioBackend::get_standard_device_name(AudioBackend::DeviceDefault),
 474                                                 nfo_i->maxInputChannels,
 475                                                 nfo_o->maxOutputChannels
 476                                                 )));
 477         }
 478 }
 479
 480 void
 481 PortAudioIO::add_devices ()
 482 {
 483         const PaHostApiInfo* info = Pa_GetHostApiInfo (_host_api_index);
 484         if (info == NULL) return;
 485
 486         int n_devices = Pa_GetDeviceCount();
 487
 488         DEBUG_AUDIO (string_compose ("PortAudio found %1 devices\n", n_devices));
 489
 490         for (int i = 0 ; i < n_devices; ++i) {
 491                 const PaDeviceInfo* nfo = Pa_GetDeviceInfo(i);
 492
 493                 if (!nfo) continue;
 494                 if (nfo->hostApi != _host_api_index) continue;
 495
 496                 DEBUG_AUDIO (string_compose (" (%1) '%2' '%3' in: %4 (lat: %5 .. %6) out: %7 "
 497                                              "(lat: %8 .. %9) sr:%10\n",
 498                                              i,
 499                                              info->name,
 500                                              nfo->name,
 501                                              nfo->maxInputChannels,
 502                                              nfo->defaultLowInputLatency * 1e3,
 503                                              nfo->defaultHighInputLatency * 1e3,
 504                                              nfo->maxOutputChannels,
 505                                              nfo->defaultLowOutputLatency * 1e3,
 506                                              nfo->defaultHighOutputLatency * 1e3,
 507                                              nfo->defaultSampleRate));
 508
 509                 if ( nfo->maxInputChannels == 0 && nfo->maxOutputChannels == 0) {
 510                         continue;
 511                 }
 512
 513                 if (nfo->maxInputChannels > 0) {
 514                         _input_devices.insert (std::pair<int, paDevice*> (i, new paDevice(
 515                                                         nfo->name,
 516                                                         nfo->maxInputChannels,
 517                                                         nfo->maxOutputChannels
 518                                                         )));
 519                 }
 520                 if (nfo->maxOutputChannels > 0) {
 521                         _output_devices.insert (std::pair<int, paDevice*> (i, new paDevice(
 522                                                         nfo->name,
 523                                                         nfo->maxInputChannels,
 524                                                         nfo->maxOutputChannels
 525                                                         )));
 526                 }
 527         }
 528 }
 529
 530 void
 531 PortAudioIO::discover()
 532 {
 533         DEBUG_AUDIO ("PortAudio: discover\n");
 534         if (!pa_initialize()) return;
 535
 536         clear_device_lists ();
 537         add_none_devices ();
 538         add_devices ();
 539 }
 540
 541 void
 542 PortAudioIO::reset_stream_dependents ()
 543 {
 544         _capture_channels = 0;
 545         _playback_channels = 0;
 546         _cur_sample_rate = 0;
 547         _cur_input_latency = 0;
 548         _cur_output_latency = 0;
 549 }
 550
 551 void
 552 PortAudioIO::pcm_stop ()
 553 {
 554         if (_stream) {
 555                 Pa_CloseStream (_stream);
 556         }
 557         _stream = NULL;
 558
 559         reset_stream_dependents();
 560
 561         free (_input_buffer); _input_buffer = NULL;
 562         free (_output_buffer); _output_buffer = NULL;
 563 }
 564
 565 int
 566 PortAudioIO::pcm_start()
 567 {
 568         PaError err = Pa_StartStream (_stream);
 569
 570         if (err != paNoError) {
 571                 return -1;
 572         }
 573         return 0;
 574 }
 575
 576 bool
 577 PortAudioIO::set_sample_rate_and_latency_from_stream ()
 578 {
 579         const PaStreamInfo* nfo_s = Pa_GetStreamInfo(_stream);
 580
 581         if (nfo_s == NULL) {
 582                 return false;
 583         }
 584
 585         _cur_sample_rate = nfo_s->sampleRate;
 586         _cur_input_latency = nfo_s->inputLatency * _cur_sample_rate;
 587         _cur_output_latency = nfo_s->outputLatency * _cur_sample_rate;
 588
 589         DEBUG_AUDIO (string_compose ("PA Sample Rate %1 SPS\n", _cur_sample_rate));
 590
 591         DEBUG_AUDIO (string_compose ("PA Input Latency %1ms, %2 spl\n",
 592                                      1e3 * nfo_s->inputLatency,
 593                                      _cur_input_latency));
 594
 595         DEBUG_AUDIO (string_compose ("PA Output Latency %1ms, %2 spl\n",
 596                                      1e3 * nfo_s->outputLatency,
 597                                      _cur_output_latency));
 598         return true;
 599 }
 600
 601 bool
 602 PortAudioIO::allocate_buffers_for_blocking_api (uint32_t samples_per_period)
 603 {
 604         if (_capture_channels > 0) {
 605                 _input_buffer =
 606                     (float*)malloc(samples_per_period * _capture_channels * sizeof(float));
 607                 if (!_input_buffer) {
 608                         DEBUG_AUDIO("PortAudio failed to allocate input buffer.\n");
 609                         return false;
 610                 }
 611         }
 612
 613         if (_playback_channels > 0) {
 614                 _output_buffer =
 615                     (float*)calloc(samples_per_period * _playback_channels, sizeof(float));
 616                 if (!_output_buffer) {
 617                         DEBUG_AUDIO("PortAudio failed to allocate output buffer.\n");
 618                         return false;
 619                 }
 620         }
 621         return true;
 622 }
 623
 624 bool
 625 PortAudioIO::get_input_stream_params(int device_input,
 626                                      PaStreamParameters& inputParam) const
 627 {
 628         const PaDeviceInfo *nfo_in = NULL;
 629
 630         if (device_input == DeviceDefault) {
 631                 device_input = get_default_input_device ();
 632         }
 633
 634         if (device_input == DeviceNone) {
 635                 return false;
 636         }
 637
 638         nfo_in = Pa_GetDeviceInfo(device_input);
 639
 640         if (nfo_in == NULL) {
 641                 DEBUG_AUDIO ("PortAudio Cannot Query Input Device Info\n");
 642                 return false;
 643         }
 644
 645         inputParam.device = device_input;
 646         inputParam.channelCount = nfo_in->maxInputChannels;
 647 #ifdef INTERLEAVED_INPUT
 648         inputParam.sampleFormat = paFloat32;
 649 #else
 650         inputParam.sampleFormat = paFloat32 | paNonInterleaved;
 651 #endif
 652         inputParam.suggestedLatency = nfo_in->defaultLowInputLatency;
 653         inputParam.hostApiSpecificStreamInfo = NULL;
 654
 655         return true;
 656 }
 657
 658 bool
 659 PortAudioIO::get_output_stream_params(int device_output,
 660                                       PaStreamParameters& outputParam) const
 661 {
 662         const PaDeviceInfo *nfo_out = NULL;
 663
 664         if (device_output == DeviceDefault) {
 665                 device_output = get_default_output_device ();
 666         }
 667
 668         if (device_output == DeviceNone) {
 669                 return false;
 670         }
 671
 672         nfo_out = Pa_GetDeviceInfo(device_output);
 673
 674         if (nfo_out == NULL) {
 675                 DEBUG_AUDIO ("PortAudio Cannot Query Output Device Info\n");
 676                 return false;
 677         }
 678
 679         outputParam.device = device_output;
 680         outputParam.channelCount = nfo_out->maxOutputChannels;
 681 #ifdef INTERLEAVED_OUTPUT
 682         outputParam.sampleFormat = paFloat32;
 683 #else
 684         outputParam.sampleFormat = paFloat32 | paNonInterleaved;
 685 #endif
 686         outputParam.suggestedLatency = nfo_out->defaultLowOutputLatency;
 687         outputParam.hostApiSpecificStreamInfo = NULL;
 688
 689         return true;
 690 }
 691
 692 PortAudioIO::ErrorCode
 693 PortAudioIO::pre_stream_open(int device_input,
 694                              PaStreamParameters& inputParam,
 695                              int device_output,
 696                              PaStreamParameters& outputParam)
 697 {
 698         if (!pa_initialize()) {
 699                 DEBUG_AUDIO ("PortAudio Initialization Failed\n");
 700                 return InitializationError;
 701         }
 702
 703         reset_stream_dependents ();
 704
 705         DEBUG_AUDIO (string_compose (
 706             "PortAudio Device IDs: i:%1 o:%2\n", device_input, device_output));
 707
 708         if (device_input == DeviceNone && device_output == DeviceNone) {
 709                 return DeviceConfigNotSupportedError;
 710         }
 711
 712         if (get_input_stream_params(device_input, inputParam)) {
 713                 _capture_channels = inputParam.channelCount;
 714         }
 715
 716         if (get_output_stream_params(device_output, outputParam)) {
 717                 _playback_channels = outputParam.channelCount;
 718         }
 719
 720         if (_capture_channels == 0 && _playback_channels == 0) {
 721                 DEBUG_AUDIO("PortAudio no input or output channels.\n");
 722                 return DeviceConfigNotSupportedError;
 723         }
 724
 725         DEBUG_AUDIO (string_compose ("PortAudio Channels: in:%1 out:%2\n",
 726                                      _capture_channels,
 727                                      _playback_channels));
 728
 729         return NoError;
 730 }
 731
 732 PortAudioIO::ErrorCode
 733 PortAudioIO::pcm_setup(int device_input,
 734                        int device_output,
 735                        double sample_rate,
 736                        uint32_t samples_per_period)
 737 {
 738         PaStreamParameters inputParam;
 739         PaStreamParameters outputParam;
 740
 741         ErrorCode error_code =
 742             pre_stream_open(device_input, inputParam, device_output, outputParam);
 743
 744         if (error_code != NoError) return error_code;
 745
 746         PaError err = paNoError;
 747
 748         err = Pa_OpenStream (
 749                         &_stream,
 750                         _capture_channels > 0 ? &inputParam: NULL,
 751                         _playback_channels > 0 ? &outputParam: NULL,
 752                         sample_rate,
 753                         samples_per_period,
 754                         paDitherOff,
 755                         NULL, NULL);
 756
 757         if (err != paNoError) {
 758                 DEBUG_AUDIO ("PortAudio failed to start stream.\n");
 759                 return StreamOpenError;
 760         }
 761
 762         if (!set_sample_rate_and_latency_from_stream()) {
 763                 DEBUG_AUDIO ("PortAudio failed to query stream information.\n");
 764                 pcm_stop();
 765                 return StreamOpenError;
 766         }
 767
 768         if (!allocate_buffers_for_blocking_api(samples_per_period)) {
 769                 pcm_stop();
 770                 return StreamOpenError;
 771         }
 772         return NoError;
 773 }
 774
 775 int
 776 PortAudioIO::next_cycle (uint32_t n_samples)
 777 {
 778         bool xrun = false;
 779         PaError err;
 780         err = Pa_IsStreamActive (_stream);
 781         if (err != 1) {
 782                 //   0: inactive / aborted
 783                 // < 0: error
 784                 return -1;
 785         }
 786
 787         // TODO, check drift..  process part with larger capacity first.
 788         // Pa_GetStreamReadAvailable(_stream) < Pa_GetStreamWriteAvailable(_stream)
 789
 790         if (_playback_channels > 0) {
 791                 err = Pa_WriteStream (_stream, _output_buffer, n_samples);
 792                 if (err) xrun = true;
 793         }
 794
 795         if (_capture_channels > 0) {
 796                 err = Pa_ReadStream (_stream, _input_buffer, n_samples);
 797                 if (err) {
 798                         memset (_input_buffer, 0, sizeof(float) * n_samples * _capture_channels);
 799                         xrun = true;
 800                 }
 801         }
 802
 803
 804         return xrun ? 1 : 0;
 805 }
 806
 807 std::string
 808 PortAudioIO::get_input_channel_name (int device_id, uint32_t channel) const
 809 {
 810 #ifdef WITH_ASIO
 811         const char* channel_name;
 812
 813         // This will return an error for non-ASIO devices so no need to check if
 814         // the device_id corresponds to an ASIO device.
 815         PaError err = PaAsio_GetInputChannelName (device_id, channel, &channel_name);
 816
 817         if (err == paNoError) {
 818                 DEBUG_AUDIO (
 819                     string_compose ("Input channel name for device %1, channel %2 is %3\n",
 820                                     device_id,
 821                                     channel,
 822                                     channel_name));
 823                 return channel_name;
 824         }
 825 #endif
 826         return std::string();
 827 }
 828
 829 std::string
 830 PortAudioIO::get_output_channel_name (int device_id, uint32_t channel) const
 831 {
 832 #ifdef WITH_ASIO
 833         const char* channel_name;
 834
 835         PaError err = PaAsio_GetOutputChannelName (device_id, channel, &channel_name);
 836
 837         if (err == paNoError) {
 838                 DEBUG_AUDIO (
 839                     string_compose ("Output channel name for device %1, channel %2 is %3\n",
 840                                     device_id,
 841                                     channel,
 842                                     channel_name));
 843                 return channel_name;
 844         }
 845 #endif
 846         return std::string();
 847 }
 848
 849 #ifdef INTERLEAVED_INPUT
 850
 851 int
 852 PortAudioIO::get_capture_channel (uint32_t chn, float *input, uint32_t n_samples)
 853 {
 854         assert(chn < _capture_channels);
 855         const uint32_t stride = _capture_channels;
 856         float *ptr = _input_buffer + chn;
 857         while (n_samples-- > 0) {
 858                 *input++ = *ptr;
 859                 ptr += stride;
 860         }
 861         return 0;
 862 }
 863
 864 #else
 865
 866 int
 867 PortAudioIO::get_capture_channel (uint32_t chn, float *input, uint32_t n_samples)
 868 {
 869         assert(chn < _capture_channels);
 870         memcpy((void*)input, &(_input_buffer[chn * n_samples]), n_samples * sizeof(float));
 871         return 0;
 872 }
 873
 874 #endif
 875
 876
 877 #ifdef INTERLEAVED_OUTPUT
 878
 879 int
 880 PortAudioIO::set_playback_channel (uint32_t chn, const float *output, uint32_t n_samples)
 881 {
 882         assert(chn < _playback_channels);
 883         const uint32_t stride = _playback_channels;
 884         float *ptr = _output_buffer + chn;
 885         while (n_samples-- > 0) {
 886                 *ptr = *output++;
 887                 ptr += stride;
 888         }
 889         return 0;
 890 }
 891
 892 #else
 893
 894 int
 895 PortAudioIO::set_playback_channel (uint32_t chn, const float *output, uint32_t n_samples)
 896 {
 897         assert(chn < _playback_channels);
 898         memcpy((void*)&(_output_buffer[chn * n_samples]), (void*)output, n_samples * sizeof(float));
 899         return 0;
 900 }
 901
 902 #endif