linux/alsa/alsa_driver.c

   1 /* -*- mode: c; c-file-style: "linux"; -*- */
   2 /*
   3     Copyright (C) 2001 Paul Davis
   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
  21
  22 #define __STDC_FORMAT_MACROS   // For inttypes.h to work in C++
  23 #define _GNU_SOURCE            /* for strcasestr() from string.h */
  24
  25 #include <math.h>
  26 #include <stdio.h>
  27 #include <memory.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <stdarg.h>
  32 #include <signal.h>
  33 #include <sys/types.h>
  34 #include <sys/time.h>
  35 #include <string.h>
  36
  37 #include "alsa_driver.h"
  38 #include "hammerfall.h"
  39 #include "hdsp.h"
  40 #include "ice1712.h"
  41 #include "usx2y.h"
  42 #include "generic.h"
  43 #include "memops.h"
  44 #include "JackError.h"
  45
  46 #include "alsa_midi_impl.h"
  47
  48 extern void store_work_time (int);
  49 extern void store_wait_time (int);
  50 extern void show_wait_times ();
  51 extern void show_work_times ();
  52
  53 #undef DEBUG_WAKEUP
  54
  55 char* strcasestr(const char* haystack, const char* needle);
  56
  57 /* Delay (in process calls) before jackd will report an xrun */
  58 #define XRUN_REPORT_DELAY 0
  59
  60 void
  61 jack_driver_init (jack_driver_t *driver)
  62 {
  63     memset (driver, 0, sizeof (*driver));
  64
  65     driver->attach = 0;
  66     driver->detach = 0;
  67     driver->write = 0;
  68     driver->read = 0;
  69     driver->null_cycle = 0;
  70     driver->bufsize = 0;
  71     driver->start = 0;
  72     driver->stop = 0;
  73 }
  74
  75 void
  76 jack_driver_nt_init (jack_driver_nt_t * driver)
  77 {
  78     memset (driver, 0, sizeof (*driver));
  79
  80     jack_driver_init ((jack_driver_t *) driver);
  81
  82     driver->attach = 0;
  83     driver->detach = 0;
  84     driver->bufsize = 0;
  85     driver->stop = 0;
  86     driver->start = 0;
  87
  88     driver->nt_bufsize = 0;
  89     driver->nt_start = 0;
  90     driver->nt_stop = 0;
  91     driver->nt_attach = 0;
  92     driver->nt_detach = 0;
  93     driver->nt_run_cycle = 0;
  94 }
  95
  96 static void
  97 alsa_driver_release_channel_dependent_memory (alsa_driver_t *driver)
  98 {
  99         bitset_destroy (&driver->channels_done);
 100         bitset_destroy (&driver->channels_not_done);
 101
 102         if (driver->playback_addr) {
 103                 free (driver->playback_addr);
 104                 driver->playback_addr = 0;
 105         }
 106
 107         if (driver->capture_addr) {
 108                 free (driver->capture_addr);
 109                 driver->capture_addr = 0;
 110         }
 111
 112         if (driver->playback_interleave_skip) {
 113                 free (driver->playback_interleave_skip);
 114                 driver->playback_interleave_skip = NULL;
 115         }
 116
 117         if (driver->capture_interleave_skip) {
 118                 free (driver->capture_interleave_skip);
 119                 driver->capture_interleave_skip = NULL;
 120         }
 121
 122         if (driver->silent) {
 123                 free (driver->silent);
 124                 driver->silent = 0;
 125         }
 126
 127         if (driver->dither_state) {
 128                 free (driver->dither_state);
 129                 driver->dither_state = 0;
 130         }
 131 }
 132
 133 static int
 134 alsa_driver_check_capabilities (alsa_driver_t *driver)
 135 {
 136         return 0;
 137 }
 138
 139 char* get_control_device_name(const char * device_name);
 140
 141 static int
 142 alsa_driver_check_card_type (alsa_driver_t *driver)
 143 {
 144         int err;
 145         snd_ctl_card_info_t *card_info;
 146         char * ctl_name;
 147
 148         snd_ctl_card_info_alloca (&card_info);
 149
 150         ctl_name = get_control_device_name(driver->alsa_name_playback);
 151
 152         // XXX: I don't know the "right" way to do this. Which to use
 153         // driver->alsa_name_playback or driver->alsa_name_capture.
 154         if ((err = snd_ctl_open (&driver->ctl_handle, ctl_name, 0)) < 0) {
 155                 jack_error ("control open \"%s\" (%s)", ctl_name,
 156                             snd_strerror(err));
 157         } else if ((err = snd_ctl_card_info(driver->ctl_handle, card_info)) < 0) {
 158                 jack_error ("control hardware info \"%s\" (%s)",
 159                             driver->alsa_name_playback, snd_strerror (err));
 160                 snd_ctl_close (driver->ctl_handle);
 161         }
 162
 163         driver->alsa_driver = strdup(snd_ctl_card_info_get_driver (card_info));
 164
 165         free(ctl_name);
 166
 167         return alsa_driver_check_capabilities (driver);
 168 }
 169
 170 static int
 171 alsa_driver_hammerfall_hardware (alsa_driver_t *driver)
 172 {
 173         driver->hw = jack_alsa_hammerfall_hw_new (driver);
 174         return 0;
 175 }
 176
 177 static int
 178 alsa_driver_hdsp_hardware (alsa_driver_t *driver)
 179 {
 180         driver->hw = jack_alsa_hdsp_hw_new (driver);
 181         return 0;
 182 }
 183
 184 static int
 185 alsa_driver_ice1712_hardware (alsa_driver_t *driver)
 186 {
 187         driver->hw = jack_alsa_ice1712_hw_new (driver);
 188         return 0;
 189 }
 190
 191 // JACK2
 192 /*
 193 static int
 194 alsa_driver_usx2y_hardware (alsa_driver_t *driver)
 195 {
 196     driver->hw = jack_alsa_usx2y_hw_new (driver);
 197     return 0;
 198 }
 199 */
 200
 201 static int
 202 alsa_driver_generic_hardware (alsa_driver_t *driver)
 203 {
 204         driver->hw = jack_alsa_generic_hw_new (driver);
 205         return 0;
 206 }
 207
 208 static int
 209 alsa_driver_hw_specific (alsa_driver_t *driver, int hw_monitoring,
 210                          int hw_metering)
 211 {
 212         int err;
 213
 214         if (!strcmp(driver->alsa_driver, "RME9652")) {
 215                 if ((err = alsa_driver_hammerfall_hardware (driver)) != 0) {
 216                         return err;
 217                 }
 218         } else if (!strcmp(driver->alsa_driver, "H-DSP")) {
 219                 if ((err = alsa_driver_hdsp_hardware (driver)) !=0) {
 220                         return err;
 221                 }
 222         } else if (!strcmp(driver->alsa_driver, "ICE1712")) {
 223                 if ((err = alsa_driver_ice1712_hardware (driver)) !=0) {
 224                         return err;
 225                 }
 226         }
 227     // JACK2
 228     /*
 229         else if (!strcmp(driver->alsa_driver, "USB US-X2Y")) {
 230                 if ((err = alsa_driver_usx2y_hardware (driver)) !=0) {
 231                                 return err;
 232                 }
 233         }
 234     */
 235        else {
 236                 if ((err = alsa_driver_generic_hardware (driver)) != 0) {
 237                         return err;
 238                 }
 239         }
 240
 241         if (driver->hw->capabilities & Cap_HardwareMonitoring) {
 242                 driver->has_hw_monitoring = TRUE;
 243                 /* XXX need to ensure that this is really FALSE or
 244                  * TRUE or whatever*/
 245                 driver->hw_monitoring = hw_monitoring;
 246         } else {
 247                 driver->has_hw_monitoring = FALSE;
 248                 driver->hw_monitoring = FALSE;
 249         }
 250
 251         if (driver->hw->capabilities & Cap_ClockLockReporting) {
 252                 driver->has_clock_sync_reporting = TRUE;
 253         } else {
 254                 driver->has_clock_sync_reporting = FALSE;
 255         }
 256
 257         if (driver->hw->capabilities & Cap_HardwareMetering) {
 258                 driver->has_hw_metering = TRUE;
 259                 driver->hw_metering = hw_metering;
 260         } else {
 261                 driver->has_hw_metering = FALSE;
 262                 driver->hw_metering = FALSE;
 263         }
 264
 265         return 0;
 266 }
 267
 268 static void
 269 alsa_driver_setup_io_function_pointers (alsa_driver_t *driver)
 270 {
 271         if (driver->playback_handle) {
 272                 if (SND_PCM_FORMAT_FLOAT_LE == driver->playback_sample_format) {
 273                         driver->write_via_copy = sample_move_dS_floatLE;
 274                 } else {
 275                         switch (driver->playback_sample_bytes) {
 276                         case 2:
 277                                 switch (driver->dither) {
 278                                 case Rectangular:
 279                                         jack_info("Rectangular dithering at 16 bits");
 280                                         driver->write_via_copy = driver->quirk_bswap?
 281                                                 sample_move_dither_rect_d16_sSs:
 282                                                 sample_move_dither_rect_d16_sS;
 283                                         break;
 284
 285                                 case Triangular:
 286                                         jack_info("Triangular dithering at 16 bits");
 287                                         driver->write_via_copy = driver->quirk_bswap?
 288                                                 sample_move_dither_tri_d16_sSs:
 289                                                 sample_move_dither_tri_d16_sS;
 290                                         break;
 291
 292                                 case Shaped:
 293                                         jack_info("Noise-shaped dithering at 16 bits");
 294                                         driver->write_via_copy = driver->quirk_bswap?
 295                                                 sample_move_dither_shaped_d16_sSs:
 296                                                 sample_move_dither_shaped_d16_sS;
 297                                         break;
 298
 299                                 default:
 300                                         driver->write_via_copy = driver->quirk_bswap?
 301                                                 sample_move_d16_sSs :
 302                                                 sample_move_d16_sS;
 303                                         break;
 304                                 }
 305                                 break;
 306
 307                         case 3: /* NO DITHER */
 308                                 driver->write_via_copy = driver->quirk_bswap?
 309                                         sample_move_d24_sSs:
 310                                         sample_move_d24_sS;
 311
 312                                 break;
 313
 314                         case 4: /* NO DITHER */
 315                                 driver->write_via_copy = driver->quirk_bswap?
 316                                         sample_move_d32u24_sSs:
 317                                         sample_move_d32u24_sS;
 318                                 break;
 319
 320                         default:
 321                                 jack_error ("impossible sample width (%d) discovered!",
 322                                                 driver->playback_sample_bytes);
 323                                 exit (1);
 324                         }
 325                 }
 326         }
 327
 328         if (driver->capture_handle) {
 329                 if (SND_PCM_FORMAT_FLOAT_LE == driver->capture_sample_format) {
 330                         driver->read_via_copy = sample_move_floatLE_sSs;
 331                 } else {
 332                         switch (driver->capture_sample_bytes) {
 333                         case 2:
 334                                 driver->read_via_copy = driver->quirk_bswap?
 335                                         sample_move_dS_s16s:
 336                                         sample_move_dS_s16;
 337                                 break;
 338                         case 3:
 339                                 driver->read_via_copy = driver->quirk_bswap?
 340                                         sample_move_dS_s24s:
 341                                         sample_move_dS_s24;
 342                                 break;
 343                         case 4:
 344                                 driver->read_via_copy = driver->quirk_bswap?
 345                                         sample_move_dS_s32u24s:
 346                                         sample_move_dS_s32u24;
 347                                 break;
 348                         }
 349                 }
 350         }
 351 }
 352
 353 static int
 354 alsa_driver_configure_stream (alsa_driver_t *driver, char *device_name,
 355                               const char *stream_name,
 356                               snd_pcm_t *handle,
 357                               snd_pcm_hw_params_t *hw_params,
 358                               snd_pcm_sw_params_t *sw_params,
 359                               unsigned int *nperiodsp,
 360                               channel_t *nchns,
 361                               unsigned long sample_width)
 362 {
 363         int err, format;
 364         unsigned int frame_rate;
 365         snd_pcm_uframes_t stop_th;
 366         static struct {
 367                 char Name[40];
 368                 snd_pcm_format_t format;
 369                 int swapped;
 370         } formats[] = {
 371                 {"32bit float little-endian", SND_PCM_FORMAT_FLOAT_LE, IS_LE},
 372                 {"32bit integer little-endian", SND_PCM_FORMAT_S32_LE, IS_LE},
 373                 {"32bit integer big-endian", SND_PCM_FORMAT_S32_BE, IS_BE},
 374                 {"24bit little-endian in 3bytes format", SND_PCM_FORMAT_S24_3LE, IS_LE},
 375                 {"24bit big-endian in 3bytes format", SND_PCM_FORMAT_S24_3BE, IS_BE},
 376                 {"24bit little-endian", SND_PCM_FORMAT_S24_LE, IS_LE},
 377                 {"24bit big-endian", SND_PCM_FORMAT_S24_BE, IS_BE},
 378                 {"16bit little-endian", SND_PCM_FORMAT_S16_LE, IS_LE},
 379                 {"16bit big-endian", SND_PCM_FORMAT_S16_BE, IS_BE},
 380         };
 381 #define NUMFORMATS (sizeof(formats)/sizeof(formats[0]))
 382 #define FIRST_16BIT_FORMAT 5
 383
 384         if ((err = snd_pcm_hw_params_any (handle, hw_params)) < 0)  {
 385                 jack_error ("ALSA: no playback configurations available (%s)",
 386                             snd_strerror (err));
 387                 return -1;
 388         }
 389
 390         if ((err = snd_pcm_hw_params_set_periods_integer (handle, hw_params))
 391             < 0) {
 392                 jack_error ("ALSA: cannot restrict period size to integral"
 393                             " value.");
 394                 return -1;
 395         }
 396
 397         if ((err = snd_pcm_hw_params_set_access (handle, hw_params, SND_PCM_ACCESS_MMAP_NONINTERLEAVED)) < 0) {
 398                 if ((err = snd_pcm_hw_params_set_access (handle, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
 399                         if ((err = snd_pcm_hw_params_set_access (
 400                                      handle, hw_params,
 401                                      SND_PCM_ACCESS_MMAP_COMPLEX)) < 0) {
 402                                 jack_error ("ALSA: mmap-based access is not possible"
 403                                             " for the %s "
 404                                             "stream of this audio interface",
 405                                             stream_name);
 406                                 return -1;
 407                         }
 408                 }
 409         }
 410
 411         format = (sample_width == 4) ? 0 : NUMFORMATS - 1;
 412
 413         while (1) {
 414                 if ((err = snd_pcm_hw_params_set_format (
 415                              handle, hw_params, formats[format].format)) < 0) {
 416
 417                         if ((sample_width == 4
 418                              ? format++ >= NUMFORMATS - 1
 419                              : format-- <= 0)) {
 420                                 jack_error ("Sorry. The audio interface \"%s\""
 421                                             " doesn't support any of the"
 422                                             " hardware sample formats that"
 423                                             " JACK's alsa-driver can use.",
 424                                             device_name);
 425                                 return -1;
 426                         }
 427                 } else {
 428                         if (formats[format].swapped) {
 429                                 driver->quirk_bswap = 1;
 430                         } else {
 431                                 driver->quirk_bswap = 0;
 432                         }
 433                         jack_info ("ALSA: final selected sample format for %s: %s", stream_name, formats[format].Name);
 434                         break;
 435                 }
 436         }
 437
 438         frame_rate = driver->frame_rate ;
 439         err = snd_pcm_hw_params_set_rate_near (handle, hw_params,
 440                                                &frame_rate, NULL) ;
 441         driver->frame_rate = frame_rate ;
 442         if (err < 0) {
 443                 jack_error ("ALSA: cannot set sample/frame rate to %"
 444                             PRIu32 " for %s", driver->frame_rate,
 445                             stream_name);
 446                 return -1;
 447         }
 448         if (!*nchns) {
 449                 /*if not user-specified, try to find the maximum
 450                  * number of channels */
 451                 unsigned int channels_max ;
 452                 err = snd_pcm_hw_params_get_channels_max (hw_params,
 453                                                           &channels_max);
 454                 *nchns = channels_max ;
 455
 456                 if (*nchns > 1024) {
 457
 458                         /* the hapless user is an unwitting victim of
 459                            the "default" ALSA PCM device, which can
 460                            support up to 16 million channels. since
 461                            they can't be bothered to set up a proper
 462                            default device, limit the number of
 463                            channels for them to a sane default.
 464                         */
 465
 466                         jack_error (
 467 "You appear to be using the ALSA software \"plug\" layer, probably\n"
 468 "a result of using the \"default\" ALSA device. This is less\n"
 469 "efficient than it could be. Consider using a hardware device\n"
 470 "instead rather than using the plug layer. Usually the name of the\n"
 471 "hardware device that corresponds to the first sound card is hw:0\n"
 472                                 );
 473                         *nchns = 2;
 474                 }
 475         }
 476
 477         if ((err = snd_pcm_hw_params_set_channels (handle, hw_params,
 478                                                    *nchns)) < 0) {
 479                 jack_error ("ALSA: cannot set channel count to %u for %s",
 480                             *nchns, stream_name);
 481                 return -1;
 482         }
 483
 484         if ((err = snd_pcm_hw_params_set_period_size (handle, hw_params,
 485                                                       driver->frames_per_cycle,
 486                                                       0))
 487             < 0) {
 488                 jack_error ("ALSA: cannot set period size to %" PRIu32
 489                             " frames for %s", driver->frames_per_cycle,
 490                             stream_name);
 491                 return -1;
 492         }
 493
 494         *nperiodsp = driver->user_nperiods;
 495         snd_pcm_hw_params_set_periods_min (handle, hw_params, nperiodsp, NULL);
 496         if (*nperiodsp < driver->user_nperiods)
 497                 *nperiodsp = driver->user_nperiods;
 498         if (snd_pcm_hw_params_set_periods_near (handle, hw_params,
 499                                                 nperiodsp, NULL) < 0) {
 500                 jack_error ("ALSA: cannot set number of periods to %u for %s",
 501                             *nperiodsp, stream_name);
 502                 return -1;
 503         }
 504
 505         if (*nperiodsp < driver->user_nperiods) {
 506                 jack_error ("ALSA: got smaller periods %u than %u for %s",
 507                             *nperiodsp, (unsigned int) driver->user_nperiods,
 508                             stream_name);
 509                 return -1;
 510         }
 511         jack_info ("ALSA: use %d periods for %s", *nperiodsp, stream_name);
 512 #if 0
 513         if (!jack_power_of_two(driver->frames_per_cycle)) {
 514                 jack_error("JACK: frames must be a power of two "
 515                            "(64, 512, 1024, ...)\n");
 516                 return -1;
 517         }
 518 #endif
 519
 520         if ((err = snd_pcm_hw_params_set_buffer_size (handle, hw_params,
 521                                                       *nperiodsp *
 522                                                       driver->frames_per_cycle))
 523             < 0) {
 524                 jack_error ("ALSA: cannot set buffer length to %" PRIu32
 525                             " for %s",
 526                             *nperiodsp * driver->frames_per_cycle,
 527                             stream_name);
 528                 return -1;
 529         }
 530
 531         if ((err = snd_pcm_hw_params (handle, hw_params)) < 0) {
 532                 jack_error ("ALSA: cannot set hardware parameters for %s",
 533                             stream_name);
 534                 return -1;
 535         }
 536
 537         snd_pcm_sw_params_current (handle, sw_params);
 538
 539         if ((err = snd_pcm_sw_params_set_start_threshold (handle, sw_params,
 540                                                           0U)) < 0) {
 541                 jack_error ("ALSA: cannot set start mode for %s", stream_name);
 542                 return -1;
 543         }
 544
 545         stop_th = *nperiodsp * driver->frames_per_cycle;
 546         if (driver->soft_mode) {
 547                 stop_th = (snd_pcm_uframes_t)-1;
 548         }
 549
 550         if ((err = snd_pcm_sw_params_set_stop_threshold (
 551                      handle, sw_params, stop_th)) < 0) {
 552                 jack_error ("ALSA: cannot set stop mode for %s",
 553                             stream_name);
 554                 return -1;
 555         }
 556
 557         if ((err = snd_pcm_sw_params_set_silence_threshold (
 558                      handle, sw_params, 0)) < 0) {
 559                 jack_error ("ALSA: cannot set silence threshold for %s",
 560                             stream_name);
 561                 return -1;
 562         }
 563
 564 #if 0
 565         jack_info ("set silence size to %lu * %lu = %lu",
 566                  driver->frames_per_cycle, *nperiodsp,
 567                  driver->frames_per_cycle * *nperiodsp);
 568
 569         if ((err = snd_pcm_sw_params_set_silence_size (
 570                      handle, sw_params,
 571                      driver->frames_per_cycle * *nperiodsp)) < 0) {
 572                 jack_error ("ALSA: cannot set silence size for %s",
 573                             stream_name);
 574                 return -1;
 575         }
 576 #endif
 577
 578         if (handle == driver->playback_handle)
 579                 err = snd_pcm_sw_params_set_avail_min (
 580                         handle, sw_params,
 581                         driver->frames_per_cycle
 582                         * (*nperiodsp - driver->user_nperiods + 1));
 583         else
 584                 err = snd_pcm_sw_params_set_avail_min (
 585                         handle, sw_params, driver->frames_per_cycle);
 586
 587         if (err < 0) {
 588                 jack_error ("ALSA: cannot set avail min for %s", stream_name);
 589                 return -1;
 590         }
 591
 592         err = snd_pcm_sw_params_set_tstamp_mode(handle, sw_params, SND_PCM_TSTAMP_ENABLE);
 593         if (err < 0) {
 594                 jack_info("Could not enable ALSA time stamp mode for %s (err %d)",
 595                           stream_name, err);
 596         }
 597
 598 #if SND_LIB_MAJOR >= 1 && SND_LIB_MINOR >= 1
 599         err = snd_pcm_sw_params_set_tstamp_type(handle, sw_params, SND_PCM_TSTAMP_TYPE_MONOTONIC);
 600         if (err < 0) {
 601                 jack_info("Could not use monotonic ALSA time stamps for %s (err %d)",
 602                           stream_name, err);
 603         }
 604 #endif
 605
 606         if ((err = snd_pcm_sw_params (handle, sw_params)) < 0) {
 607                 jack_error ("ALSA: cannot set software parameters for %s\n",
 608                             stream_name);
 609                 return -1;
 610         }
 611
 612         return 0;
 613 }
 614
 615 static int
 616 alsa_driver_set_parameters (alsa_driver_t *driver,
 617                             jack_nframes_t frames_per_cycle,
 618                             jack_nframes_t user_nperiods,
 619                             jack_nframes_t rate)
 620 {
 621         int dir;
 622         snd_pcm_uframes_t p_period_size = 0;
 623         snd_pcm_uframes_t c_period_size = 0;
 624         channel_t chn;
 625         unsigned int pr = 0;
 626         unsigned int cr = 0;
 627         int err;
 628
 629         driver->frame_rate = rate;
 630         driver->frames_per_cycle = frames_per_cycle;
 631         driver->user_nperiods = user_nperiods;
 632
 633         jack_info ("configuring for %" PRIu32 "Hz, period = %"
 634                  PRIu32 " frames (%.1f ms), buffer = %" PRIu32 " periods",
 635                  rate, frames_per_cycle, (((float)frames_per_cycle / (float) rate) * 1000.0f), user_nperiods);
 636
 637         if (driver->capture_handle) {
 638                 if (alsa_driver_configure_stream (
 639                             driver,
 640                             driver->alsa_name_capture,
 641                             "capture",
 642                             driver->capture_handle,
 643                             driver->capture_hw_params,
 644                             driver->capture_sw_params,
 645                             &driver->capture_nperiods,
 646                             &driver->capture_nchannels,
 647                             driver->capture_sample_bytes)) {
 648                         jack_error ("ALSA: cannot configure capture channel");
 649                         return -1;
 650                 }
 651         }
 652
 653         if (driver->playback_handle) {
 654                 if (alsa_driver_configure_stream (
 655                             driver,
 656                             driver->alsa_name_playback,
 657                             "playback",
 658                             driver->playback_handle,
 659                             driver->playback_hw_params,
 660                             driver->playback_sw_params,
 661                             &driver->playback_nperiods,
 662                             &driver->playback_nchannels,
 663                             driver->playback_sample_bytes)) {
 664                         jack_error ("ALSA: cannot configure playback channel");
 665                         return -1;
 666                 }
 667         }
 668
 669         /* check the rate, since that's rather important */
 670
 671         if (driver->playback_handle) {
 672                 snd_pcm_hw_params_get_rate (driver->playback_hw_params,
 673                                             &pr, &dir);
 674         }
 675
 676         if (driver->capture_handle) {
 677                 snd_pcm_hw_params_get_rate (driver->capture_hw_params,
 678                                             &cr, &dir);
 679         }
 680
 681         if (driver->capture_handle && driver->playback_handle) {
 682                 if (cr != pr) {
 683                         jack_error ("playback and capture sample rates do "
 684                                     "not match (%d vs. %d)", pr, cr);
 685                 }
 686
 687                 /* only change if *both* capture and playback rates
 688                  * don't match requested certain hardware actually
 689                  * still works properly in full-duplex with slightly
 690                  * different rate values between adc and dac
 691                  */
 692                 if (cr != driver->frame_rate && pr != driver->frame_rate) {
 693                         jack_error ("sample rate in use (%d Hz) does not "
 694                                     "match requested rate (%d Hz)",
 695                                     cr, driver->frame_rate);
 696                         driver->frame_rate = cr;
 697                 }
 698
 699         }
 700         else if (driver->capture_handle && cr != driver->frame_rate) {
 701                 jack_error ("capture sample rate in use (%d Hz) does not "
 702                             "match requested rate (%d Hz)",
 703                             cr, driver->frame_rate);
 704                 driver->frame_rate = cr;
 705         }
 706         else if (driver->playback_handle && pr != driver->frame_rate) {
 707                 jack_error ("playback sample rate in use (%d Hz) does not "
 708                             "match requested rate (%d Hz)",
 709                             pr, driver->frame_rate);
 710                 driver->frame_rate = pr;
 711         }
 712
 713
 714         /* check the fragment size, since that's non-negotiable */
 715
 716         if (driver->playback_handle) {
 717                 snd_pcm_access_t access;
 718
 719                 err = snd_pcm_hw_params_get_period_size (
 720                         driver->playback_hw_params, &p_period_size, &dir);
 721                 err = snd_pcm_hw_params_get_format (
 722                         driver->playback_hw_params,
 723                         &(driver->playback_sample_format));
 724                 err = snd_pcm_hw_params_get_access (driver->playback_hw_params,
 725                                                     &access);
 726                 driver->playback_interleaved =
 727                         (access == SND_PCM_ACCESS_MMAP_INTERLEAVED)
 728                         || (access == SND_PCM_ACCESS_MMAP_COMPLEX);
 729
 730                 if (p_period_size != driver->frames_per_cycle) {
 731                         jack_error ("alsa_pcm: requested an interrupt every %"
 732                                     PRIu32
 733                                     " frames but got %u frames for playback",
 734                                     driver->frames_per_cycle, p_period_size);
 735                         return -1;
 736                 }
 737         }
 738
 739         if (driver->capture_handle) {
 740                 snd_pcm_access_t access;
 741
 742                 err = snd_pcm_hw_params_get_period_size (
 743                         driver->capture_hw_params, &c_period_size, &dir);
 744                 err = snd_pcm_hw_params_get_format (
 745                         driver->capture_hw_params,
 746                         &(driver->capture_sample_format));
 747                 err = snd_pcm_hw_params_get_access (driver->capture_hw_params,
 748                                                     &access);
 749                 driver->capture_interleaved =
 750                         (access == SND_PCM_ACCESS_MMAP_INTERLEAVED)
 751                         || (access == SND_PCM_ACCESS_MMAP_COMPLEX);
 752
 753                 if (c_period_size != driver->frames_per_cycle) {
 754                         jack_error ("alsa_pcm: requested an interrupt every %"
 755                                     PRIu32
 756                                     " frames but got %uc frames for capture",
 757                                     driver->frames_per_cycle, p_period_size);
 758                         return -1;
 759                 }
 760         }
 761
 762         driver->playback_sample_bytes =
 763                 snd_pcm_format_physical_width (driver->playback_sample_format)
 764                 / 8;
 765         driver->capture_sample_bytes =
 766                 snd_pcm_format_physical_width (driver->capture_sample_format)
 767                 / 8;
 768
 769         if (driver->playback_handle) {
 770                 switch (driver->playback_sample_format) {
 771         case SND_PCM_FORMAT_FLOAT_LE:
 772                 case SND_PCM_FORMAT_S32_LE:
 773                 case SND_PCM_FORMAT_S24_3LE:
 774                 case SND_PCM_FORMAT_S24_3BE:
 775                 case SND_PCM_FORMAT_S24_LE:
 776                 case SND_PCM_FORMAT_S24_BE:
 777                 case SND_PCM_FORMAT_S16_LE:
 778                 case SND_PCM_FORMAT_S32_BE:
 779                 case SND_PCM_FORMAT_S16_BE:
 780                         break;
 781
 782                 default:
 783                         jack_error ("programming error: unhandled format "
 784                                     "type for playback");
 785                         exit (1);
 786                 }
 787         }
 788
 789         if (driver->capture_handle) {
 790                 switch (driver->capture_sample_format) {
 791         case SND_PCM_FORMAT_FLOAT_LE:
 792                 case SND_PCM_FORMAT_S32_LE:
 793                 case SND_PCM_FORMAT_S24_3LE:
 794                 case SND_PCM_FORMAT_S24_3BE:
 795                 case SND_PCM_FORMAT_S24_LE:
 796                 case SND_PCM_FORMAT_S24_BE:
 797                 case SND_PCM_FORMAT_S16_LE:
 798                 case SND_PCM_FORMAT_S32_BE:
 799                 case SND_PCM_FORMAT_S16_BE:
 800                         break;
 801
 802                 default:
 803                         jack_error ("programming error: unhandled format "
 804                                     "type for capture");
 805                         exit (1);
 806                 }
 807         }
 808
 809         if (driver->playback_interleaved) {
 810                 const snd_pcm_channel_area_t *my_areas;
 811                 snd_pcm_uframes_t offset, frames;
 812                 if (snd_pcm_mmap_begin(driver->playback_handle,
 813                                        &my_areas, &offset, &frames) < 0) {
 814                         jack_error ("ALSA: %s: mmap areas info error",
 815                                     driver->alsa_name_playback);
 816                         return -1;
 817                 }
 818                 driver->interleave_unit =
 819                         snd_pcm_format_physical_width (
 820                                 driver->playback_sample_format) / 8;
 821         } else {
 822                 driver->interleave_unit = 0;  /* NOT USED */
 823         }
 824
 825         if (driver->capture_interleaved) {
 826                 const snd_pcm_channel_area_t *my_areas;
 827                 snd_pcm_uframes_t offset, frames;
 828                 if (snd_pcm_mmap_begin(driver->capture_handle,
 829                                        &my_areas, &offset, &frames) < 0) {
 830                         jack_error ("ALSA: %s: mmap areas info error",
 831                                     driver->alsa_name_capture);
 832                         return -1;
 833                 }
 834         }
 835
 836         if (driver->playback_nchannels > driver->capture_nchannels) {
 837                 driver->max_nchannels = driver->playback_nchannels;
 838                 driver->user_nchannels = driver->capture_nchannels;
 839         } else {
 840                 driver->max_nchannels = driver->capture_nchannels;
 841                 driver->user_nchannels = driver->playback_nchannels;
 842         }
 843
 844         alsa_driver_setup_io_function_pointers (driver);
 845
 846         /* Allocate and initialize structures that rely on the
 847            channels counts.
 848
 849            Set up the bit pattern that is used to record which
 850            channels require action on every cycle. any bits that are
 851            not set after the engine's process() call indicate channels
 852            that potentially need to be silenced.
 853         */
 854
 855         bitset_create (&driver->channels_done, driver->max_nchannels);
 856         bitset_create (&driver->channels_not_done, driver->max_nchannels);
 857
 858         if (driver->playback_handle) {
 859                 driver->playback_addr = (char **)
 860                         malloc (sizeof (char *) * driver->playback_nchannels);
 861                 memset (driver->playback_addr, 0,
 862                         sizeof (char *) * driver->playback_nchannels);
 863                 driver->playback_interleave_skip = (unsigned long *)
 864                         malloc (sizeof (unsigned long *) * driver->playback_nchannels);
 865                 memset (driver->playback_interleave_skip, 0,
 866                         sizeof (unsigned long *) * driver->playback_nchannels);
 867                 driver->silent = (unsigned long *)
 868                         malloc (sizeof (unsigned long)
 869                                 * driver->playback_nchannels);
 870
 871                 for (chn = 0; chn < driver->playback_nchannels; chn++) {
 872                         driver->silent[chn] = 0;
 873                 }
 874
 875                 for (chn = 0; chn < driver->playback_nchannels; chn++) {
 876                         bitset_add (driver->channels_done, chn);
 877                 }
 878
 879                 driver->dither_state = (dither_state_t *)
 880                         calloc ( driver->playback_nchannels,
 881                                  sizeof (dither_state_t));
 882         }
 883
 884         if (driver->capture_handle) {
 885                 driver->capture_addr = (char **)
 886                         malloc (sizeof (char *) * driver->capture_nchannels);
 887                 memset (driver->capture_addr, 0,
 888                         sizeof (char *) * driver->capture_nchannels);
 889                 driver->capture_interleave_skip = (unsigned long *)
 890                         malloc (sizeof (unsigned long *) * driver->capture_nchannels);
 891                 memset (driver->capture_interleave_skip, 0,
 892                         sizeof (unsigned long *) * driver->capture_nchannels);
 893         }
 894
 895         driver->clock_sync_data = (ClockSyncStatus *)
 896                 malloc (sizeof (ClockSyncStatus) * driver->max_nchannels);
 897
 898         driver->period_usecs =
 899                 (jack_time_t) floor ((((float) driver->frames_per_cycle) /
 900                                       driver->frame_rate) * 1000000.0f);
 901         driver->poll_timeout = (int) floor (1.5f * driver->period_usecs);
 902
 903 // JACK2
 904 /*
 905         if (driver->engine) {
 906                 if (driver->engine->set_buffer_size (driver->engine,
 907                                                      driver->frames_per_cycle)) {
 908                         jack_error ("ALSA: Cannot set engine buffer size to %d (check MIDI)", driver->frames_per_cycle);
 909                         return -1;
 910                 }
 911         }
 912 */
 913
 914         return 0;
 915
 916         // may be unused
 917         (void)err;
 918 }
 919
 920 int
 921 alsa_driver_reset_parameters (alsa_driver_t *driver,
 922                               jack_nframes_t frames_per_cycle,
 923                               jack_nframes_t user_nperiods,
 924                               jack_nframes_t rate)
 925 {
 926         /* XXX unregister old ports ? */
 927         alsa_driver_release_channel_dependent_memory (driver);
 928         return alsa_driver_set_parameters (driver,
 929                                            frames_per_cycle,
 930                                            user_nperiods, rate);
 931 }
 932
 933 static int
 934 alsa_driver_get_channel_addresses (alsa_driver_t *driver,
 935                                    snd_pcm_uframes_t *capture_avail,
 936                                    snd_pcm_uframes_t *playback_avail,
 937                                    snd_pcm_uframes_t *capture_offset,
 938                                    snd_pcm_uframes_t *playback_offset)
 939 {
 940         int err;
 941         channel_t chn;
 942
 943         if (capture_avail) {
 944                 if ((err = snd_pcm_mmap_begin (
 945                              driver->capture_handle, &driver->capture_areas,
 946                              (snd_pcm_uframes_t *) capture_offset,
 947                              (snd_pcm_uframes_t *) capture_avail)) < 0) {
 948                         jack_error ("ALSA: %s: mmap areas info error",
 949                                     driver->alsa_name_capture);
 950                         return -1;
 951                 }
 952
 953                 for (chn = 0; chn < driver->capture_nchannels; chn++) {
 954                         const snd_pcm_channel_area_t *a =
 955                                 &driver->capture_areas[chn];
 956                         driver->capture_addr[chn] = (char *) a->addr
 957                                 + ((a->first + a->step * *capture_offset) / 8);
 958                         driver->capture_interleave_skip[chn] = (unsigned long ) (a->step / 8);
 959                 }
 960         }
 961
 962         if (playback_avail) {
 963                 if ((err = snd_pcm_mmap_begin (
 964                              driver->playback_handle, &driver->playback_areas,
 965                              (snd_pcm_uframes_t *) playback_offset,
 966                              (snd_pcm_uframes_t *) playback_avail)) < 0) {
 967                         jack_error ("ALSA: %s: mmap areas info error ",
 968                                     driver->alsa_name_playback);
 969                         return -1;
 970                 }
 971
 972                 for (chn = 0; chn < driver->playback_nchannels; chn++) {
 973                         const snd_pcm_channel_area_t *a =
 974                                 &driver->playback_areas[chn];
 975                         driver->playback_addr[chn] = (char *) a->addr
 976                                 + ((a->first + a->step * *playback_offset) / 8);
 977                         driver->playback_interleave_skip[chn] = (unsigned long ) (a->step / 8);
 978                 }
 979         }
 980
 981         return 0;
 982 }
 983
 984 int
 985 alsa_driver_start (alsa_driver_t *driver)
 986 {
 987         int err;
 988         snd_pcm_uframes_t poffset, pavail;
 989         channel_t chn;
 990
 991         driver->poll_last = 0;
 992         driver->poll_next = 0;
 993
 994         if (driver->playback_handle) {
 995                 if ((err = snd_pcm_prepare (driver->playback_handle)) < 0) {
 996                         jack_error ("ALSA: prepare error for playback on "
 997                                     "\"%s\" (%s)", driver->alsa_name_playback,
 998                                     snd_strerror(err));
 999                         return -1;
1000                 }
1001         }
1002
1003         if ((driver->capture_handle && driver->capture_and_playback_not_synced)
1004             || !driver->playback_handle) {
1005                 if ((err = snd_pcm_prepare (driver->capture_handle)) < 0) {
1006                         jack_error ("ALSA: prepare error for capture on \"%s\""
1007                                     " (%s)", driver->alsa_name_capture,
1008                                     snd_strerror(err));
1009                         return -1;
1010                 }
1011         }
1012
1013         if (driver->hw_monitoring) {
1014                 if (driver->input_monitor_mask || driver->all_monitor_in) {
1015                         if (driver->all_monitor_in) {
1016                                 driver->hw->set_input_monitor_mask (driver->hw, ~0U);
1017                         } else {
1018                                 driver->hw->set_input_monitor_mask (
1019                                         driver->hw, driver->input_monitor_mask);
1020                         }
1021                 } else {
1022                         driver->hw->set_input_monitor_mask (driver->hw,
1023                                                             driver->input_monitor_mask);
1024                 }
1025         }
1026
1027         if (driver->playback_handle) {
1028                 driver->playback_nfds =
1029                         snd_pcm_poll_descriptors_count (driver->playback_handle);
1030         } else {
1031                 driver->playback_nfds = 0;
1032         }
1033
1034         if (driver->capture_handle) {
1035                 driver->capture_nfds =
1036                         snd_pcm_poll_descriptors_count (driver->capture_handle);
1037         } else {
1038                 driver->capture_nfds = 0;
1039         }
1040
1041         if (driver->pfd) {
1042                 free (driver->pfd);
1043         }
1044
1045         driver->pfd = (struct pollfd *)
1046                 malloc (sizeof (struct pollfd) *
1047                         (driver->playback_nfds + driver->capture_nfds + 2));
1048
1049         if (driver->midi && !driver->xrun_recovery)
1050                 (driver->midi->start)(driver->midi);
1051
1052         if (driver->playback_handle) {
1053                 /* fill playback buffer with zeroes, and mark
1054                    all fragments as having data.
1055                 */
1056
1057                 pavail = snd_pcm_avail_update (driver->playback_handle);
1058
1059                 if (pavail !=
1060                     driver->frames_per_cycle * driver->playback_nperiods) {
1061                         jack_error ("ALSA: full buffer not available at start");
1062                         return -1;
1063                 }
1064
1065                 if (alsa_driver_get_channel_addresses (driver,
1066                                         0, &pavail, 0, &poffset)) {
1067                         return -1;
1068                 }
1069
1070                 /* XXX this is cheating. ALSA offers no guarantee that
1071                    we can access the entire buffer at any one time. It
1072                    works on most hardware tested so far, however, buts
1073                    its a liability in the long run. I think that
1074                    alsa-lib may have a better function for doing this
1075                    here, where the goal is to silence the entire
1076                    buffer.
1077                 */
1078
1079                 for (chn = 0; chn < driver->playback_nchannels; chn++) {
1080                         alsa_driver_silence_on_channel (
1081                                 driver, chn,
1082                                 driver->user_nperiods
1083                                 * driver->frames_per_cycle);
1084                 }
1085
1086                 snd_pcm_mmap_commit (driver->playback_handle, poffset,
1087                                      driver->user_nperiods
1088                                      * driver->frames_per_cycle);
1089
1090                 if ((err = snd_pcm_start (driver->playback_handle)) < 0) {
1091                         jack_error ("ALSA: could not start playback (%s)",
1092                                     snd_strerror (err));
1093                         return -1;
1094                 }
1095         }
1096
1097         if ((driver->capture_handle && driver->capture_and_playback_not_synced)
1098             || !driver->playback_handle) {
1099                 if ((err = snd_pcm_start (driver->capture_handle)) < 0) {
1100                         jack_error ("ALSA: could not start capture (%s)",
1101                                     snd_strerror (err));
1102                         return -1;
1103                 }
1104         }
1105
1106         return 0;
1107 }
1108
1109 int
1110 alsa_driver_stop (alsa_driver_t *driver)
1111 {
1112         int err;
1113 //      JSList* node;
1114 //      int chn;
1115
1116         /* silence all capture port buffers, because we might
1117            be entering offline mode.
1118         */
1119
1120 // JACK2
1121 /*
1122         for (chn = 0, node = driver->capture_ports; node;
1123              node = jack_slist_next (node), chn++) {
1124
1125                 jack_port_t* port;
1126                 char* buf;
1127                 jack_nframes_t nframes = driver->engine->control->buffer_size;
1128
1129                 port = (jack_port_t *) node->data;
1130                 buf = jack_port_get_buffer (port, nframes);
1131                 memset (buf, 0, sizeof (jack_default_audio_sample_t) * nframes);
1132         }
1133 */
1134
1135 // JACK2
1136     ClearOutput();
1137
1138         if (driver->playback_handle) {
1139                 if ((err = snd_pcm_drop (driver->playback_handle)) < 0) {
1140                         jack_error ("ALSA: channel flush for playback "
1141                                     "failed (%s)", snd_strerror (err));
1142                         return -1;
1143                 }
1144         }
1145
1146         if (!driver->playback_handle
1147             || driver->capture_and_playback_not_synced) {
1148                 if (driver->capture_handle) {
1149                         if ((err = snd_pcm_drop (driver->capture_handle)) < 0) {
1150                                 jack_error ("ALSA: channel flush for "
1151                                             "capture failed (%s)",
1152                                             snd_strerror (err));
1153                                 return -1;
1154                         }
1155                 }
1156         }
1157
1158         if (driver->hw_monitoring) {
1159                 driver->hw->set_input_monitor_mask (driver->hw, 0);
1160         }
1161
1162         if (driver->midi && !driver->xrun_recovery)
1163                 (driver->midi->stop)(driver->midi);
1164
1165         return 0;
1166 }
1167
1168 static int
1169 alsa_driver_restart (alsa_driver_t *driver)
1170 {
1171         int res;
1172
1173         driver->xrun_recovery = 1;
1174     // JACK2
1175     /*
1176         if ((res = driver->nt_stop((struct _jack_driver_nt *) driver))==0)
1177                 res = driver->nt_start((struct _jack_driver_nt *) driver);
1178     */
1179     res = Restart();
1180         driver->xrun_recovery = 0;
1181
1182         if (res && driver->midi)
1183                 (driver->midi->stop)(driver->midi);
1184
1185         return res;
1186 }
1187
1188 static int
1189 alsa_driver_xrun_recovery (alsa_driver_t *driver, float *delayed_usecs)
1190 {
1191         snd_pcm_status_t *status;
1192         int res;
1193
1194         snd_pcm_status_alloca(&status);
1195
1196         if (driver->capture_handle) {
1197                 if ((res = snd_pcm_status(driver->capture_handle, status))
1198                     < 0) {
1199                         jack_error("status error: %s", snd_strerror(res));
1200                 }
1201         } else {
1202                 if ((res = snd_pcm_status(driver->playback_handle, status))
1203                     < 0) {
1204                         jack_error("status error: %s", snd_strerror(res));
1205                 }
1206         }
1207
1208         if (snd_pcm_status_get_state(status) == SND_PCM_STATE_SUSPENDED)
1209         {
1210                 jack_log("**** alsa_pcm: pcm in suspended state, resuming it" );
1211                 if (driver->capture_handle) {
1212                         if ((res = snd_pcm_prepare(driver->capture_handle))
1213                             < 0) {
1214                                 jack_error("error preparing after suspend: %s", snd_strerror(res));
1215                         }
1216                 }
1217                 if (driver->playback_handle) {
1218                         if ((res = snd_pcm_prepare(driver->playback_handle))
1219                             < 0) {
1220                                 jack_error("error preparing after suspend: %s", snd_strerror(res));
1221                         }
1222                 }
1223         }
1224
1225         if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN
1226             && driver->process_count > XRUN_REPORT_DELAY) {
1227                 struct timeval now, diff, tstamp;
1228                 driver->xrun_count++;
1229                 snd_pcm_status_get_tstamp(status,&now);
1230                 snd_pcm_status_get_trigger_tstamp(status, &tstamp);
1231                 timersub(&now, &tstamp, &diff);
1232                 *delayed_usecs = diff.tv_sec * 1000000.0 + diff.tv_usec;
1233                 jack_log("**** alsa_pcm: xrun of at least %.3f msecs",*delayed_usecs / 1000.0);
1234                 if (driver->capture_handle) {
1235                         jack_log("Repreparing capture");
1236                         if ((res = snd_pcm_prepare(driver->capture_handle)) < 0) {
1237                                 jack_error("error preparing after xrun: %s", snd_strerror(res));
1238                         }
1239                 }
1240                 if (driver->playback_handle) {
1241                         jack_log("Repreparing playback");
1242                         if ((res = snd_pcm_prepare(driver->playback_handle)) < 0) {
1243                                 jack_error("error preparing after xrun: %s", snd_strerror(res));
1244                         }
1245                 }
1246         }
1247
1248         if (alsa_driver_restart (driver)) {
1249                 return -1;
1250         }
1251         return 0;
1252 }
1253
1254 void
1255 alsa_driver_silence_untouched_channels (alsa_driver_t *driver,
1256                                         jack_nframes_t nframes)
1257 {
1258         channel_t chn;
1259         jack_nframes_t buffer_frames =
1260                 driver->frames_per_cycle * driver->playback_nperiods;
1261
1262         for (chn = 0; chn < driver->playback_nchannels; chn++) {
1263                 if (bitset_contains (driver->channels_not_done, chn)) {
1264                         if (driver->silent[chn] < buffer_frames) {
1265                                 alsa_driver_silence_on_channel_no_mark (
1266                                         driver, chn, nframes);
1267                                 driver->silent[chn] += nframes;
1268                         }
1269                 }
1270         }
1271 }
1272
1273 void
1274 alsa_driver_set_clock_sync_status (alsa_driver_t *driver, channel_t chn,
1275                                    ClockSyncStatus status)
1276 {
1277         driver->clock_sync_data[chn] = status;
1278         alsa_driver_clock_sync_notify (driver, chn, status);
1279 }
1280
1281 static int under_gdb = FALSE;
1282
1283 jack_nframes_t
1284 alsa_driver_wait (alsa_driver_t *driver, int extra_fd, int *status, float
1285                   *delayed_usecs)
1286 {
1287         snd_pcm_sframes_t avail = 0;
1288         snd_pcm_sframes_t capture_avail = 0;
1289         snd_pcm_sframes_t playback_avail = 0;
1290         int xrun_detected = FALSE;
1291         int need_capture;
1292         int need_playback;
1293         unsigned int i;
1294         jack_time_t poll_enter;
1295         jack_time_t poll_ret = 0;
1296
1297         *status = -1;
1298         *delayed_usecs = 0;
1299
1300         need_capture = driver->capture_handle ? 1 : 0;
1301
1302         if (extra_fd >= 0) {
1303                 need_playback = 0;
1304         } else {
1305                 need_playback = driver->playback_handle ? 1 : 0;
1306         }
1307
1308   again:
1309
1310         while ((need_playback || need_capture) && !xrun_detected) {
1311
1312                 int poll_result;
1313                 unsigned int ci = 0;
1314                 unsigned int nfds;
1315                 unsigned short revents;
1316
1317                 nfds = 0;
1318
1319                 if (need_playback) {
1320                         snd_pcm_poll_descriptors (driver->playback_handle,
1321                                                   &driver->pfd[0],
1322                                                   driver->playback_nfds);
1323                         nfds += driver->playback_nfds;
1324                 }
1325
1326                 if (need_capture) {
1327                         snd_pcm_poll_descriptors (driver->capture_handle,
1328                                                   &driver->pfd[nfds],
1329                                                   driver->capture_nfds);
1330                         ci = nfds;
1331                         nfds += driver->capture_nfds;
1332                 }
1333
1334                 /* ALSA doesn't set POLLERR in some versions of 0.9.X */
1335
1336                 for (i = 0; i < nfds; i++) {
1337                         driver->pfd[i].events |= POLLERR;
1338                 }
1339
1340                 if (extra_fd >= 0) {
1341                         driver->pfd[nfds].fd = extra_fd;
1342                         driver->pfd[nfds].events =
1343                                 POLLIN|POLLERR|POLLHUP|POLLNVAL;
1344                         nfds++;
1345                 }
1346
1347                 poll_enter = jack_get_microseconds ();
1348
1349                 if (poll_enter > driver->poll_next) {
1350                         /*
1351                          * This processing cycle was delayed past the
1352                          * next due interrupt!  Do not account this as
1353                          * a wakeup delay:
1354                          */
1355                         driver->poll_next = 0;
1356                         driver->poll_late++;
1357                 }
1358
1359 #ifdef __ANDROID__
1360                 poll_result = poll (driver->pfd, nfds, -1);  //fix for sleep issue
1361 #else
1362                 poll_result = poll (driver->pfd, nfds, driver->poll_timeout);
1363 #endif
1364                 if (poll_result < 0) {
1365
1366                         if (errno == EINTR) {
1367                                 jack_info ("poll interrupt");
1368                                 // this happens mostly when run
1369                                 // under gdb, or when exiting due to a signal
1370                                 if (under_gdb) {
1371                                         goto again;
1372                                 }
1373                                 *status = -2;
1374                                 return 0;
1375                         }
1376
1377                         jack_error ("ALSA: poll call failed (%s)",
1378                                     strerror (errno));
1379                         *status = -3;
1380                         return 0;
1381
1382                 }
1383
1384                 poll_ret = jack_get_microseconds ();
1385
1386         // JACK2
1387         SetTime(poll_ret);
1388
1389                 if (extra_fd < 0) {
1390                         if (driver->poll_next && poll_ret > driver->poll_next) {
1391                                 *delayed_usecs = poll_ret - driver->poll_next;
1392                         }
1393                         driver->poll_last = poll_ret;
1394                         driver->poll_next = poll_ret + driver->period_usecs;
1395 // JACK2
1396 /*
1397                         driver->engine->transport_cycle_start (driver->engine,
1398                                                                poll_ret);
1399 */
1400                 }
1401
1402 #ifdef DEBUG_WAKEUP
1403                 fprintf (stderr, "%" PRIu64 ": checked %d fds, started at %" PRIu64 " %" PRIu64 "  usecs since poll entered\n",
1404                          poll_ret, nfds, poll_enter, poll_ret - poll_enter);
1405 #endif
1406
1407                 /* check to see if it was the extra FD that caused us
1408                  * to return from poll */
1409
1410                 if (extra_fd >= 0) {
1411
1412                         if (driver->pfd[nfds-1].revents == 0) {
1413                                 /* we timed out on the extra fd */
1414
1415                                 *status = -4;
1416                                 return -1;
1417                         }
1418
1419                         /* if POLLIN was the only bit set, we're OK */
1420
1421                         *status = 0;
1422                         return (driver->pfd[nfds-1].revents == POLLIN) ? 0 : -1;
1423                 }
1424
1425                 if (need_playback) {
1426                         if (snd_pcm_poll_descriptors_revents
1427                             (driver->playback_handle, &driver->pfd[0],
1428                              driver->playback_nfds, &revents) < 0) {
1429                                 jack_error ("ALSA: playback revents failed");
1430                                 *status = -6;
1431                                 return 0;
1432                         }
1433
1434                         if (revents & POLLNVAL) {
1435                                 jack_error ("ALSA: playback device disconnected");
1436                                 *status = -7;
1437                                 return 0;
1438                         }
1439
1440                         if (revents & POLLERR) {
1441                                 xrun_detected = TRUE;
1442                         }
1443
1444                         if (revents & POLLOUT) {
1445                                 need_playback = 0;
1446 #ifdef DEBUG_WAKEUP
1447                                 fprintf (stderr, "%" PRIu64
1448                                          " playback stream ready\n",
1449                                          poll_ret);
1450 #endif
1451                         }
1452                 }
1453
1454                 if (need_capture) {
1455                         if (snd_pcm_poll_descriptors_revents
1456                             (driver->capture_handle, &driver->pfd[ci],
1457                              driver->capture_nfds, &revents) < 0) {
1458                                 jack_error ("ALSA: capture revents failed");
1459                                 *status = -6;
1460                                 return 0;
1461                         }
1462
1463                         if (revents & POLLNVAL) {
1464                                 jack_error ("ALSA: capture device disconnected");
1465                                 *status = -7;
1466                                 return 0;
1467                         }
1468
1469                         if (revents & POLLERR) {
1470                                 xrun_detected = TRUE;
1471                         }
1472
1473                         if (revents & POLLIN) {
1474                                 need_capture = 0;
1475 #ifdef DEBUG_WAKEUP
1476                                 fprintf (stderr, "%" PRIu64
1477                                          " capture stream ready\n",
1478                                          poll_ret);
1479 #endif
1480                         }
1481                 }
1482
1483                 if (poll_result == 0) {
1484                         jack_error ("ALSA: poll time out, polled for %" PRIu64
1485                                     " usecs",
1486                                     poll_ret - poll_enter);
1487                         *status = -5;
1488                         return 0;
1489                 }
1490
1491         }
1492
1493         if (driver->capture_handle) {
1494                 if ((capture_avail = snd_pcm_avail_update (
1495                              driver->capture_handle)) < 0) {
1496                         if (capture_avail == -EPIPE) {
1497                                 xrun_detected = TRUE;
1498                         } else {
1499                                 jack_error ("unknown ALSA avail_update return"
1500                                             " value (%u)", capture_avail);
1501                         }
1502                 }
1503         } else {
1504                 /* odd, but see min() computation below */
1505                 capture_avail = INT_MAX;
1506         }
1507
1508         if (driver->playback_handle) {
1509                 if ((playback_avail = snd_pcm_avail_update (
1510                              driver->playback_handle)) < 0) {
1511                         if (playback_avail == -EPIPE) {
1512                                 xrun_detected = TRUE;
1513                         } else {
1514                                 jack_error ("unknown ALSA avail_update return"
1515                                             " value (%u)", playback_avail);
1516                         }
1517                 }
1518         } else {
1519                 /* odd, but see min() computation below */
1520                 playback_avail = INT_MAX;
1521         }
1522
1523         if (xrun_detected) {
1524                 *status = alsa_driver_xrun_recovery (driver, delayed_usecs);
1525                 return 0;
1526         }
1527
1528         *status = 0;
1529         driver->last_wait_ust = poll_ret;
1530
1531         avail = capture_avail < playback_avail ? capture_avail : playback_avail;
1532
1533 #ifdef DEBUG_WAKEUP
1534         fprintf (stderr, "wakeup complete, avail = %lu, pavail = %lu "
1535                  "cavail = %lu\n",
1536                  avail, playback_avail, capture_avail);
1537 #endif
1538
1539         /* mark all channels not done for now. read/write will change this */
1540
1541         bitset_copy (driver->channels_not_done, driver->channels_done);
1542
1543         /* constrain the available count to the nearest (round down) number of
1544            periods.
1545         */
1546
1547         return avail - (avail % driver->frames_per_cycle);
1548 }
1549
1550
1551 int
1552 alsa_driver_read (alsa_driver_t *driver, jack_nframes_t nframes)
1553 {
1554         snd_pcm_sframes_t contiguous;
1555         snd_pcm_sframes_t nread;
1556         snd_pcm_uframes_t offset;
1557         jack_nframes_t  orig_nframes;
1558 //      jack_default_audio_sample_t* buf;
1559 //      channel_t chn;
1560 //      JSList *node;
1561 //      jack_port_t* port;
1562         int err;
1563
1564         if (nframes > driver->frames_per_cycle) {
1565                 return -1;
1566         }
1567
1568 // JACK2
1569 /*
1570         if (driver->engine->freewheeling) {
1571                 return 0;
1572         }
1573 */
1574         if (driver->midi)
1575                 (driver->midi->read)(driver->midi, nframes);
1576
1577         if (!driver->capture_handle) {
1578                 return 0;
1579         }
1580
1581         nread = 0;
1582         contiguous = 0;
1583         orig_nframes = nframes;
1584
1585         while (nframes) {
1586
1587                 contiguous = nframes;
1588
1589                 if (alsa_driver_get_channel_addresses (
1590                             driver,
1591                             (snd_pcm_uframes_t *) &contiguous,
1592                             (snd_pcm_uframes_t *) 0,
1593                             &offset, 0) < 0) {
1594                         return -1;
1595                 }
1596 // JACK2
1597 /*
1598                 for (chn = 0, node = driver->capture_ports; node;
1599                      node = jack_slist_next (node), chn++) {
1600
1601                         port = (jack_port_t *) node->data;
1602
1603                         if (!jack_port_connected (port)) {
1604                                 // no-copy optimization
1605                                 continue;
1606                         }
1607                         buf = jack_port_get_buffer (port, orig_nframes);
1608                         alsa_driver_read_from_channel (driver, chn,
1609                                 buf + nread, contiguous);
1610                 }
1611 */
1612         ReadInput(orig_nframes, contiguous, nread);
1613
1614                 if ((err = snd_pcm_mmap_commit (driver->capture_handle,
1615                                 offset, contiguous)) < 0) {
1616                         jack_error ("ALSA: could not complete read of %"
1617                                 PRIu32 " frames: error = %d", contiguous, err);
1618                         return -1;
1619                 }
1620
1621                 nframes -= contiguous;
1622                 nread += contiguous;
1623         }
1624
1625         return 0;
1626 }
1627
1628 int
1629 alsa_driver_write (alsa_driver_t* driver, jack_nframes_t nframes)
1630 {
1631 //      channel_t chn;
1632 //      JSList *node;
1633 //      JSList *mon_node;
1634 //      jack_default_audio_sample_t* buf;
1635 //      jack_default_audio_sample_t* monbuf;
1636         jack_nframes_t orig_nframes;
1637         snd_pcm_sframes_t nwritten;
1638         snd_pcm_sframes_t contiguous;
1639         snd_pcm_uframes_t offset;
1640 //      jack_port_t *port;
1641         int err;
1642
1643         driver->process_count++;
1644
1645 // JACK2
1646 /*
1647         if (!driver->playback_handle || driver->engine->freewheeling) {
1648                 return 0;
1649         }
1650 */
1651         if (!driver->playback_handle) {
1652                 return 0;
1653         }
1654
1655         if (nframes > driver->frames_per_cycle) {
1656                 return -1;
1657         }
1658
1659         if (driver->midi)
1660                 (driver->midi->write)(driver->midi, nframes);
1661
1662         nwritten = 0;
1663         contiguous = 0;
1664         orig_nframes = nframes;
1665
1666         /* check current input monitor request status */
1667
1668         driver->input_monitor_mask = 0;
1669
1670 // JACK2
1671 /*
1672         for (chn = 0, node = driver->capture_ports; node;
1673              node = jack_slist_next (node), chn++) {
1674                 if (((jack_port_t *) node->data)->shared->monitor_requests) {
1675                         driver->input_monitor_mask |= (1<<chn);
1676                 }
1677         }
1678 */
1679     MonitorInput();
1680
1681         if (driver->hw_monitoring) {
1682                 if ((driver->hw->input_monitor_mask
1683                      != driver->input_monitor_mask)
1684                     && !driver->all_monitor_in) {
1685                         driver->hw->set_input_monitor_mask (
1686                                 driver->hw, driver->input_monitor_mask);
1687                 }
1688         }
1689
1690         while (nframes) {
1691
1692                 contiguous = nframes;
1693
1694                 if (alsa_driver_get_channel_addresses (
1695                             driver,
1696                             (snd_pcm_uframes_t *) 0,
1697                             (snd_pcm_uframes_t *) &contiguous,
1698                             0, &offset) < 0) {
1699                         return -1;
1700                 }
1701
1702 // JACK2
1703 /*
1704                 for (chn = 0, node = driver->playback_ports, mon_node=driver->monitor_ports;
1705                      node;
1706                      node = jack_slist_next (node), chn++) {
1707
1708                         port = (jack_port_t *) node->data;
1709
1710                         if (!jack_port_connected (port)) {
1711                                 continue;
1712                         }
1713                         buf = jack_port_get_buffer (port, orig_nframes);
1714                         alsa_driver_write_to_channel (driver, chn,
1715                                 buf + nwritten, contiguous);
1716
1717                         if (mon_node) {
1718                                 port = (jack_port_t *) mon_node->data;
1719                                 if (!jack_port_connected (port)) {
1720                                         continue;
1721                                 }
1722                                 monbuf = jack_port_get_buffer (port, orig_nframes);
1723                                 memcpy (monbuf + nwritten, buf + nwritten, contiguous * sizeof(jack_default_audio_sample_t));
1724                                 mon_node = jack_slist_next (mon_node);
1725                         }
1726                 }
1727 */
1728
1729         // JACK2
1730         WriteOutput(orig_nframes, contiguous, nwritten);
1731
1732                 if (!bitset_empty (driver->channels_not_done)) {
1733                         alsa_driver_silence_untouched_channels (driver,
1734                                                                 contiguous);
1735                 }
1736
1737                 if ((err = snd_pcm_mmap_commit (driver->playback_handle,
1738                                 offset, contiguous)) < 0) {
1739                         jack_error ("ALSA: could not complete playback of %"
1740                                 PRIu32 " frames: error = %d", contiguous, err);
1741                         if (err != -EPIPE && err != -ESTRPIPE)
1742                                 return -1;
1743                 }
1744
1745                 nframes -= contiguous;
1746                 nwritten += contiguous;
1747         }
1748
1749         return 0;
1750 }
1751
1752 #if 0
1753 static int  /* UNUSED */
1754 alsa_driver_change_sample_clock (alsa_driver_t *driver, SampleClockMode mode)
1755 {
1756         return driver->hw->change_sample_clock (driver->hw, mode);
1757 }
1758
1759 static void  /* UNUSED */
1760 alsa_driver_request_all_monitor_input (alsa_driver_t *driver, int yn)
1761
1762 {
1763         if (driver->hw_monitoring) {
1764                 if (yn) {
1765                         driver->hw->set_input_monitor_mask (driver->hw, ~0U);
1766                 } else {
1767                         driver->hw->set_input_monitor_mask (
1768                                 driver->hw, driver->input_monitor_mask);
1769                 }
1770         }
1771
1772         driver->all_monitor_in = yn;
1773 }
1774
1775 static void  /* UNUSED */
1776 alsa_driver_set_hw_monitoring (alsa_driver_t *driver, int yn)
1777 {
1778         if (yn) {
1779                 driver->hw_monitoring = TRUE;
1780
1781                 if (driver->all_monitor_in) {
1782                         driver->hw->set_input_monitor_mask (driver->hw, ~0U);
1783                 } else {
1784                         driver->hw->set_input_monitor_mask (
1785                                 driver->hw, driver->input_monitor_mask);
1786                 }
1787         } else {
1788                 driver->hw_monitoring = FALSE;
1789                 driver->hw->set_input_monitor_mask (driver->hw, 0);
1790         }
1791 }
1792
1793 static ClockSyncStatus  /* UNUSED */
1794 alsa_driver_clock_sync_status (channel_t chn)
1795 {
1796         return Lock;
1797 }
1798 #endif
1799
1800 void
1801 alsa_driver_delete (alsa_driver_t *driver)
1802 {
1803         JSList *node;
1804
1805         if (driver->midi)
1806                 (driver->midi->destroy)(driver->midi);
1807
1808         for (node = driver->clock_sync_listeners; node;
1809              node = jack_slist_next (node)) {
1810                 free (node->data);
1811         }
1812         jack_slist_free (driver->clock_sync_listeners);
1813
1814         if (driver->ctl_handle) {
1815                 snd_ctl_close (driver->ctl_handle);
1816                 driver->ctl_handle = 0;
1817         }
1818
1819         if (driver->capture_handle) {
1820                 snd_pcm_close (driver->capture_handle);
1821                 driver->capture_handle = 0;
1822         }
1823
1824         if (driver->playback_handle) {
1825                 snd_pcm_close (driver->playback_handle);
1826                 driver->capture_handle = 0;
1827         }
1828
1829         if (driver->capture_hw_params) {
1830                 snd_pcm_hw_params_free (driver->capture_hw_params);
1831                 driver->capture_hw_params = 0;
1832         }
1833
1834         if (driver->playback_hw_params) {
1835                 snd_pcm_hw_params_free (driver->playback_hw_params);
1836                 driver->playback_hw_params = 0;
1837         }
1838
1839         if (driver->capture_sw_params) {
1840                 snd_pcm_sw_params_free (driver->capture_sw_params);
1841                 driver->capture_sw_params = 0;
1842         }
1843
1844         if (driver->playback_sw_params) {
1845                 snd_pcm_sw_params_free (driver->playback_sw_params);
1846                 driver->playback_sw_params = 0;
1847         }
1848
1849         if (driver->pfd) {
1850                 free (driver->pfd);
1851         }
1852
1853         if (driver->hw) {
1854                 driver->hw->release (driver->hw);
1855                 driver->hw = 0;
1856         }
1857         free(driver->alsa_name_playback);
1858         free(driver->alsa_name_capture);
1859         free(driver->alsa_driver);
1860
1861         alsa_driver_release_channel_dependent_memory (driver);
1862     //JACK2
1863     //jack_driver_nt_finish ((jack_driver_nt_t *) driver);
1864         free (driver);
1865 }
1866
1867 static char*
1868 discover_alsa_using_apps ()
1869 {
1870         char found[2048];
1871         char command[5192];
1872         char* path = getenv ("PATH");
1873         char* dir;
1874         size_t flen = 0;
1875         int card;
1876         int device;
1877         size_t cmdlen = 0;
1878
1879         if (!path) {
1880                 return NULL;
1881         }
1882
1883         /* look for lsof and give up if its not in PATH */
1884
1885         path = strdup (path);
1886         dir = strtok (path, ":");
1887         while (dir) {
1888                 char maybe[PATH_MAX+1];
1889                 snprintf (maybe, sizeof(maybe), "%s/lsof", dir);
1890                 if (access (maybe, X_OK) == 0) {
1891                         break;
1892                 }
1893                 dir = strtok (NULL, ":");
1894         }
1895         free (path);
1896
1897         if (!dir) {
1898                 return NULL;
1899         }
1900
1901         snprintf (command, sizeof (command), "lsof -Fc0 ");
1902         cmdlen = strlen (command);
1903
1904         for (card = 0; card < 8; ++card) {
1905                 for (device = 0; device < 8; ++device)  {
1906                         char buf[32];
1907
1908                         snprintf (buf, sizeof (buf), "/dev/snd/pcmC%dD%dp", card, device);
1909                         if (access (buf, F_OK) == 0) {
1910                                 snprintf (command+cmdlen, sizeof(command)-cmdlen, "%s ", buf);
1911                         }
1912                         cmdlen = strlen (command);
1913
1914                         snprintf (buf, sizeof (buf), "/dev/snd/pcmC%dD%dc", card, device);
1915                         if (access (buf, F_OK) == 0) {
1916                                 snprintf (command+cmdlen, sizeof(command)-cmdlen, "%s ", buf);
1917                         }
1918                         cmdlen = strlen (command);
1919                 }
1920         }
1921
1922         FILE* f = popen (command, "r");
1923
1924         if (!f) {
1925                 return NULL;
1926         }
1927
1928         while (!feof (f)) {
1929                 char buf[1024]; /* lsof doesn't output much */
1930
1931                 if (!fgets (buf, sizeof (buf), f)) {
1932                         break;
1933                 }
1934
1935                 if (*buf != 'p') {
1936                         return NULL;
1937                 }
1938
1939                 /* buf contains NULL as a separator between the process field and the command field */
1940                 char *pid = buf;
1941                 ++pid; /* skip leading 'p' */
1942                 char *cmd = pid;
1943
1944                 /* skip to NULL */
1945                 while (*cmd) {
1946                         ++cmd;
1947                 }
1948                 ++cmd; /* skip to 'c' */
1949                 ++cmd; /* skip to first character of command */
1950
1951                 snprintf (found+flen, sizeof (found)-flen, "%s (process ID %s)\n", cmd, pid);
1952                 flen = strlen (found);
1953
1954                 if (flen >= sizeof (found)) {
1955                         break;
1956                 }
1957         }
1958
1959         pclose (f);
1960
1961         if (flen) {
1962                 return strdup (found);
1963         } else {
1964                 return NULL;
1965         }
1966 }
1967
1968 jack_driver_t *
1969 alsa_driver_new (char *name, char *playback_alsa_device,
1970                  char *capture_alsa_device,
1971                  jack_client_t *client,
1972                  jack_nframes_t frames_per_cycle,
1973                  jack_nframes_t user_nperiods,
1974                  jack_nframes_t rate,
1975                  int hw_monitoring,
1976                  int hw_metering,
1977                  int capturing,
1978                  int playing,
1979                  DitherAlgorithm dither,
1980                  int soft_mode,
1981                  int monitor,
1982                  int user_capture_nchnls,
1983                  int user_playback_nchnls,
1984                  int shorts_first,
1985                  jack_nframes_t capture_latency,
1986                  jack_nframes_t playback_latency,
1987                  alsa_midi_t *midi_driver
1988                  )
1989 {
1990         int err;
1991     char* current_apps;
1992         alsa_driver_t *driver;
1993
1994         jack_info ("creating alsa driver ... %s|%s|%" PRIu32 "|%" PRIu32
1995                 "|%" PRIu32"|%" PRIu32"|%" PRIu32 "|%s|%s|%s|%s",
1996                 playing ? playback_alsa_device : "-",
1997                 capturing ? capture_alsa_device : "-",
1998                 frames_per_cycle, user_nperiods, rate,
1999                 user_capture_nchnls,user_playback_nchnls,
2000                 hw_monitoring ? "hwmon": "nomon",
2001                 hw_metering ? "hwmeter":"swmeter",
2002                 soft_mode ? "soft-mode":"-",
2003                 shorts_first ? "16bit":"32bit");
2004
2005         driver = (alsa_driver_t *) calloc (1, sizeof (alsa_driver_t));
2006
2007         jack_driver_nt_init ((jack_driver_nt_t *) driver);
2008
2009     // JACK2
2010     /*
2011         driver->nt_attach = (JackDriverNTAttachFunction) alsa_driver_attach;
2012     driver->nt_detach = (JackDriverNTDetachFunction) alsa_driver_detach;
2013         driver->read = (JackDriverReadFunction) alsa_driver_read;
2014         driver->write = (JackDriverReadFunction) alsa_driver_write;
2015         driver->null_cycle = (JackDriverNullCycleFunction) alsa_driver_null_cycle;
2016         driver->nt_bufsize = (JackDriverNTBufSizeFunction) alsa_driver_bufsize;
2017         driver->nt_start = (JackDriverNTStartFunction) alsa_driver_start;
2018         driver->nt_stop = (JackDriverNTStopFunction) alsa_driver_stop;
2019         driver->nt_run_cycle = (JackDriverNTRunCycleFunction) alsa_driver_run_cycle;
2020     */
2021
2022         driver->playback_handle = NULL;
2023         driver->capture_handle = NULL;
2024         driver->ctl_handle = 0;
2025         driver->hw = 0;
2026         driver->capture_and_playback_not_synced = FALSE;
2027         driver->max_nchannels = 0;
2028         driver->user_nchannels = 0;
2029         driver->playback_nchannels = user_playback_nchnls;
2030         driver->capture_nchannels = user_capture_nchnls;
2031         driver->playback_sample_bytes = (shorts_first ? 2:4);
2032         driver->capture_sample_bytes = (shorts_first ? 2:4);
2033         driver->capture_frame_latency = capture_latency;
2034         driver->playback_frame_latency = playback_latency;
2035
2036         driver->playback_addr = 0;
2037         driver->capture_addr = 0;
2038         driver->playback_interleave_skip = NULL;
2039         driver->capture_interleave_skip = NULL;
2040
2041
2042         driver->silent = 0;
2043         driver->all_monitor_in = FALSE;
2044         driver->with_monitor_ports = monitor;
2045
2046         driver->clock_mode = ClockMaster; /* XXX is it? */
2047         driver->input_monitor_mask = 0;   /* XXX is it? */
2048
2049         driver->capture_ports = 0;
2050         driver->playback_ports = 0;
2051         driver->monitor_ports = 0;
2052
2053         driver->pfd = 0;
2054         driver->playback_nfds = 0;
2055         driver->capture_nfds = 0;
2056
2057         driver->dither = dither;
2058         driver->soft_mode = soft_mode;
2059
2060         driver->quirk_bswap = 0;
2061
2062         pthread_mutex_init (&driver->clock_sync_lock, 0);
2063         driver->clock_sync_listeners = 0;
2064
2065         driver->poll_late = 0;
2066         driver->xrun_count = 0;
2067         driver->process_count = 0;
2068
2069         driver->alsa_name_playback = strdup (playback_alsa_device);
2070         driver->alsa_name_capture = strdup (capture_alsa_device);
2071
2072         driver->midi = midi_driver;
2073         driver->xrun_recovery = 0;
2074
2075         if (alsa_driver_check_card_type (driver)) {
2076                 alsa_driver_delete (driver);
2077                 return NULL;
2078         }
2079
2080         alsa_driver_hw_specific (driver, hw_monitoring, hw_metering);
2081
2082         if (playing) {
2083                 if (snd_pcm_open (&driver->playback_handle,
2084                                   playback_alsa_device,
2085                                   SND_PCM_STREAM_PLAYBACK,
2086                                   SND_PCM_NONBLOCK) < 0) {
2087                         switch (errno) {
2088                         case EBUSY:
2089 #ifdef __ANDROID__
2090                 jack_error ("\n\nATTENTION: The playback device \"%s\" is "
2091                             "already in use. Please stop the"
2092                             " application using it and "
2093                             "run JACK again",
2094                             playback_alsa_device);
2095 #else
2096                 current_apps = discover_alsa_using_apps ();
2097                 if (current_apps) {
2098                         jack_error ("\n\nATTENTION: The playback device \"%s\" is "
2099                                     "already in use. The following applications "
2100                                     " are using your soundcard(s) so you should "
2101                                     " check them and stop them as necessary before "
2102                                     " trying to start JACK again:\n\n%s",
2103                                     playback_alsa_device,
2104                                     current_apps);
2105                         free (current_apps);
2106                 } else {
2107                         jack_error ("\n\nATTENTION: The playback device \"%s\" is "
2108                                     "already in use. Please stop the"
2109                                     " application using it and "
2110                                     "run JACK again",
2111                                     playback_alsa_device);
2112                 }
2113 #endif
2114                 alsa_driver_delete (driver);
2115                                 return NULL;
2116
2117                         case EPERM:
2118                                 jack_error ("you do not have permission to open "
2119                                             "the audio device \"%s\" for playback",
2120                                             playback_alsa_device);
2121                                 alsa_driver_delete (driver);
2122                                 return NULL;
2123                                 break;
2124                         }
2125
2126                         driver->playback_handle = NULL;
2127                 }
2128
2129                 if (driver->playback_handle) {
2130                         snd_pcm_nonblock (driver->playback_handle, 0);
2131                 }
2132         }
2133
2134         if (capturing) {
2135                 if (snd_pcm_open (&driver->capture_handle,
2136                                   capture_alsa_device,
2137                                   SND_PCM_STREAM_CAPTURE,
2138                                   SND_PCM_NONBLOCK) < 0) {
2139                         switch (errno) {
2140                         case EBUSY:
2141 #ifdef __ANDROID__
2142                 jack_error ("\n\nATTENTION: The capture (recording) device \"%s\" is "
2143                             "already in use",
2144                             capture_alsa_device);
2145 #else
2146                 current_apps = discover_alsa_using_apps ();
2147                 if (current_apps) {
2148                         jack_error ("\n\nATTENTION: The capture device \"%s\" is "
2149                                     "already in use. The following applications "
2150                                     " are using your soundcard(s) so you should "
2151                                     " check them and stop them as necessary before "
2152                                     " trying to start JACK again:\n\n%s",
2153                                     capture_alsa_device,
2154                                     current_apps);
2155                         free (current_apps);
2156                 } else {
2157                         jack_error ("\n\nATTENTION: The capture (recording) device \"%s\" is "
2158                                     "already in use. Please stop the"
2159                                     " application using it and "
2160                                     "run JACK again",
2161                                     capture_alsa_device);
2162                 }
2163                                 alsa_driver_delete (driver);
2164                                 return NULL;
2165 #endif
2166                                 break;
2167
2168                         case EPERM:
2169                                 jack_error ("you do not have permission to open "
2170                                             "the audio device \"%s\" for capture",
2171                                             capture_alsa_device);
2172                                 alsa_driver_delete (driver);
2173                                 return NULL;
2174                                 break;
2175                         }
2176
2177                         driver->capture_handle = NULL;
2178                 }
2179
2180                 if (driver->capture_handle) {
2181                         snd_pcm_nonblock (driver->capture_handle, 0);
2182                 }
2183         }
2184
2185         if (driver->playback_handle == NULL) {
2186                 if (playing) {
2187
2188                         /* they asked for playback, but we can't do it */
2189
2190                         jack_error ("ALSA: Cannot open PCM device %s for "
2191                                     "playback. Falling back to capture-only"
2192                                     " mode", name);
2193
2194                         if (driver->capture_handle == NULL) {
2195                                 /* can't do anything */
2196                                 alsa_driver_delete (driver);
2197                                 return NULL;
2198                         }
2199
2200                         playing = FALSE;
2201                 }
2202         }
2203
2204         if (driver->capture_handle == NULL) {
2205                 if (capturing) {
2206
2207                         /* they asked for capture, but we can't do it */
2208
2209                         jack_error ("ALSA: Cannot open PCM device %s for "
2210                                     "capture. Falling back to playback-only"
2211                                     " mode", name);
2212
2213                         if (driver->playback_handle == NULL) {
2214                                 /* can't do anything */
2215                                 alsa_driver_delete (driver);
2216                                 return NULL;
2217                         }
2218
2219                         capturing = FALSE;
2220                 }
2221         }
2222
2223         driver->playback_hw_params = 0;
2224         driver->capture_hw_params = 0;
2225         driver->playback_sw_params = 0;
2226         driver->capture_sw_params = 0;
2227
2228         if (driver->playback_handle) {
2229                 if ((err = snd_pcm_hw_params_malloc (
2230                              &driver->playback_hw_params)) < 0) {
2231                         jack_error ("ALSA: could not allocate playback hw"
2232                                     " params structure");
2233                         alsa_driver_delete (driver);
2234                         return NULL;
2235                 }
2236
2237                 if ((err = snd_pcm_sw_params_malloc (
2238                              &driver->playback_sw_params)) < 0) {
2239                         jack_error ("ALSA: could not allocate playback sw"
2240                                     " params structure");
2241                         alsa_driver_delete (driver);
2242                         return NULL;
2243                 }
2244         }
2245
2246         if (driver->capture_handle) {
2247                 if ((err = snd_pcm_hw_params_malloc (
2248                              &driver->capture_hw_params)) < 0) {
2249                         jack_error ("ALSA: could not allocate capture hw"
2250                                     " params structure");
2251                         alsa_driver_delete (driver);
2252                         return NULL;
2253                 }
2254
2255                 if ((err = snd_pcm_sw_params_malloc (
2256                              &driver->capture_sw_params)) < 0) {
2257                         jack_error ("ALSA: could not allocate capture sw"
2258                                     " params structure");
2259                         alsa_driver_delete (driver);
2260                         return NULL;
2261                 }
2262         }
2263
2264         if (alsa_driver_set_parameters (driver, frames_per_cycle,
2265                                         user_nperiods, rate)) {
2266                 alsa_driver_delete (driver);
2267                 return NULL;
2268         }
2269
2270         driver->capture_and_playback_not_synced = FALSE;
2271
2272         if (driver->capture_handle && driver->playback_handle) {
2273                 if (snd_pcm_link (driver->playback_handle,
2274                                   driver->capture_handle) != 0) {
2275                         driver->capture_and_playback_not_synced = TRUE;
2276                 }
2277         }
2278
2279         driver->client = client;
2280
2281         return (jack_driver_t *) driver;
2282 }
2283
2284 int
2285 alsa_driver_listen_for_clock_sync_status (alsa_driver_t *driver,
2286                                           ClockSyncListenerFunction func,
2287                                           void *arg)
2288 {
2289         ClockSyncListener *csl;
2290
2291         csl = (ClockSyncListener *) malloc (sizeof (ClockSyncListener));
2292         csl->function = func;
2293         csl->arg = arg;
2294         csl->id = driver->next_clock_sync_listener_id++;
2295
2296         pthread_mutex_lock (&driver->clock_sync_lock);
2297         driver->clock_sync_listeners =
2298                 jack_slist_prepend (driver->clock_sync_listeners, csl);
2299         pthread_mutex_unlock (&driver->clock_sync_lock);
2300         return csl->id;
2301 }
2302
2303 int
2304 alsa_driver_stop_listening_to_clock_sync_status (alsa_driver_t *driver,
2305                                                  unsigned int which)
2306
2307 {
2308         JSList *node;
2309         int ret = -1;
2310         pthread_mutex_lock (&driver->clock_sync_lock);
2311         for (node = driver->clock_sync_listeners; node;
2312              node = jack_slist_next (node)) {
2313                 if (((ClockSyncListener *) node->data)->id == which) {
2314                         driver->clock_sync_listeners =
2315                                 jack_slist_remove_link (
2316                                         driver->clock_sync_listeners, node);
2317                         free (node->data);
2318                         jack_slist_free_1 (node);
2319                         ret = 0;
2320                         break;
2321                 }
2322         }
2323         pthread_mutex_unlock (&driver->clock_sync_lock);
2324         return ret;
2325 }
2326
2327 void
2328 alsa_driver_clock_sync_notify (alsa_driver_t *driver, channel_t chn,
2329                                ClockSyncStatus status)
2330 {
2331         JSList *node;
2332
2333         pthread_mutex_lock (&driver->clock_sync_lock);
2334         for (node = driver->clock_sync_listeners; node;
2335              node = jack_slist_next (node)) {
2336                 ClockSyncListener *csl = (ClockSyncListener *) node->data;
2337                 csl->function (chn, status, csl->arg);
2338         }
2339         pthread_mutex_unlock (&driver->clock_sync_lock);
2340
2341 }
2342
2343 /* DRIVER "PLUGIN" INTERFACE */
2344
2345 const char driver_client_name[] = "alsa_pcm";
2346
2347 void
2348 driver_finish (jack_driver_t *driver)
2349 {
2350         alsa_driver_delete ((alsa_driver_t *) driver);
2351 }