Alc/alsa.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <memory.h>
  26 #ifdef HAVE_DLFCN_H
  27 #include <dlfcn.h>
  28 #endif
  29 #include "alMain.h"
  30 #include "AL/al.h"
  31 #include "AL/alc.h"
  32
  33 #include <alsa/asoundlib.h>
  34
  35
  36 typedef struct {
  37     snd_pcm_t *pcmHandle;
  38     snd_pcm_format_t format;
  39
  40     ALvoid *buffer;
  41     ALsizei size;
  42
  43     volatile int killNow;
  44     ALvoid *thread;
  45 } alsa_data;
  46
  47 typedef struct {
  48     ALCchar *name;
  49     int card, dev;
  50 } DevMap;
  51
  52 static void *alsa_handle;
  53 #define MAKE_FUNC(f) static typeof(f) * p##f
  54 MAKE_FUNC(snd_strerror);
  55 MAKE_FUNC(snd_pcm_open);
  56 MAKE_FUNC(snd_pcm_close);
  57 MAKE_FUNC(snd_pcm_nonblock);
  58 MAKE_FUNC(snd_pcm_frames_to_bytes);
  59 MAKE_FUNC(snd_pcm_hw_params_malloc);
  60 MAKE_FUNC(snd_pcm_hw_params_free);
  61 MAKE_FUNC(snd_pcm_hw_params_any);
  62 MAKE_FUNC(snd_pcm_hw_params_set_access);
  63 MAKE_FUNC(snd_pcm_hw_params_set_format);
  64 MAKE_FUNC(snd_pcm_hw_params_set_channels);
  65 MAKE_FUNC(snd_pcm_hw_params_set_periods_near);
  66 MAKE_FUNC(snd_pcm_hw_params_set_rate_near);
  67 MAKE_FUNC(snd_pcm_hw_params_set_rate);
  68 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_near);
  69 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_min);
  70 MAKE_FUNC(snd_pcm_hw_params_get_period_size);
  71 MAKE_FUNC(snd_pcm_hw_params_get_access);
  72 MAKE_FUNC(snd_pcm_hw_params);
  73 MAKE_FUNC(snd_pcm_prepare);
  74 MAKE_FUNC(snd_pcm_start);
  75 MAKE_FUNC(snd_pcm_resume);
  76 MAKE_FUNC(snd_pcm_wait);
  77 MAKE_FUNC(snd_pcm_state);
  78 MAKE_FUNC(snd_pcm_avail_update);
  79 MAKE_FUNC(snd_pcm_areas_silence);
  80 MAKE_FUNC(snd_pcm_mmap_begin);
  81 MAKE_FUNC(snd_pcm_mmap_commit);
  82 MAKE_FUNC(snd_pcm_writei);
  83 MAKE_FUNC(snd_pcm_drain);
  84 MAKE_FUNC(snd_pcm_info_malloc);
  85 MAKE_FUNC(snd_pcm_info_free);
  86 MAKE_FUNC(snd_pcm_info_set_device);
  87 MAKE_FUNC(snd_pcm_info_set_subdevice);
  88 MAKE_FUNC(snd_pcm_info_set_stream);
  89 MAKE_FUNC(snd_pcm_info_get_name);
  90 MAKE_FUNC(snd_ctl_pcm_next_device);
  91 MAKE_FUNC(snd_ctl_pcm_info);
  92 MAKE_FUNC(snd_ctl_open);
  93 MAKE_FUNC(snd_ctl_close);
  94 MAKE_FUNC(snd_ctl_card_info_malloc);
  95 MAKE_FUNC(snd_ctl_card_info_free);
  96 MAKE_FUNC(snd_ctl_card_info);
  97 MAKE_FUNC(snd_ctl_card_info_get_name);
  98 MAKE_FUNC(snd_card_next);
  99 #undef MAKE_FUNC
 100
 101 #define MAX_DEVICES 16
 102 #define MAX_ALL_DEVICES 32
 103
 104 static DevMap allDevNameMap[MAX_ALL_DEVICES];
 105 static ALCchar *alsaDeviceList[MAX_DEVICES];
 106 static DevMap allCaptureDevNameMap[MAX_ALL_DEVICES];
 107
 108 static int xrun_recovery(snd_pcm_t *handle, int err)
 109 {
 110     if (err == -EPIPE)
 111     {    /* under-run */
 112         err = psnd_pcm_prepare(handle);
 113         if (err < 0)
 114             AL_PRINT("prepare failed: %s\n", psnd_strerror(err));
 115     }
 116     else if (err == -ESTRPIPE)
 117     {
 118         while ((err = psnd_pcm_resume(handle)) == -EAGAIN)
 119             Sleep(1);       /* wait until the suspend flag is released */
 120         if (err < 0)
 121         {
 122             err = psnd_pcm_prepare(handle);
 123             if (err < 0)
 124                 AL_PRINT("prepare failed: %s\n", psnd_strerror(err));
 125         }
 126     }
 127     return err;
 128 }
 129
 130
 131 static ALuint ALSAProc(ALvoid *ptr)
 132 {
 133     ALCdevice *pDevice = (ALCdevice*)ptr;
 134     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 135     const snd_pcm_channel_area_t *areas = NULL;
 136     snd_pcm_sframes_t avail, commitres;
 137     snd_pcm_uframes_t offset, frames;
 138     char *WritePtr;
 139     int WriteCnt;
 140     int err;
 141
 142     while(!data->killNow)
 143     {
 144         snd_pcm_state_t state = psnd_pcm_state(data->pcmHandle);
 145         if(state == SND_PCM_STATE_XRUN)
 146         {
 147             err = xrun_recovery(data->pcmHandle, -EPIPE);
 148             if (err < 0)
 149             {
 150                 AL_PRINT("XRUN recovery failed: %s\n", psnd_strerror(err));
 151                 break;
 152             }
 153         }
 154         else if (state == SND_PCM_STATE_SUSPENDED)
 155         {
 156             err = xrun_recovery(data->pcmHandle, -ESTRPIPE);
 157             if (err < 0)
 158             {
 159                 AL_PRINT("SUSPEND recovery failed: %s\n", psnd_strerror(err));
 160                 break;
 161             }
 162         }
 163
 164         avail = psnd_pcm_avail_update(data->pcmHandle);
 165         if(avail < 0)
 166         {
 167             err = xrun_recovery(data->pcmHandle, avail);
 168             if (err < 0)
 169             {
 170                 AL_PRINT("available update failed: %s\n", psnd_strerror(err));
 171                 break;
 172             }
 173         }
 174
 175         // make sure there's frames to process
 176         if(avail == 0)
 177         {
 178             if(state != SND_PCM_STATE_RUNNING)
 179             {
 180                 err = psnd_pcm_start(data->pcmHandle);
 181                 if(err < 0)
 182                     err = xrun_recovery(data->pcmHandle, err);
 183                 if(err < 0)
 184                 {
 185                     AL_PRINT("start failed: %s\n", psnd_strerror(err));
 186                     break;
 187                 }
 188             }
 189             else if(psnd_pcm_wait(data->pcmHandle, 1000) == 0)
 190                 AL_PRINT("Wait timeout... buffer size too low?\n");
 191             continue;
 192         }
 193
 194         // it is possible that contiguous areas are smaller, thus we use a loop
 195         while (avail > 0)
 196         {
 197             frames = avail;
 198
 199             err = psnd_pcm_mmap_begin(data->pcmHandle, &areas, &offset, &frames);
 200             if (err < 0)
 201             {
 202                 err = xrun_recovery(data->pcmHandle, err);
 203                 if (err < 0)
 204                     AL_PRINT("mmap begin error: %s\n", psnd_strerror(err));
 205                 break;
 206             }
 207
 208             SuspendContext(NULL);
 209             WritePtr = (char*)areas->addr + (offset * areas->step / 8);
 210             WriteCnt = psnd_pcm_frames_to_bytes(data->pcmHandle, frames);
 211             aluMixData(pDevice->Context, WritePtr, WriteCnt, pDevice->Format);
 212             ProcessContext(NULL);
 213
 214             commitres = psnd_pcm_mmap_commit(data->pcmHandle, offset, frames);
 215             if (commitres < 0 || (commitres-frames) != 0)
 216             {
 217                 AL_PRINT("mmap commit error: %s\n",
 218                          psnd_strerror(commitres >= 0 ? -EPIPE : commitres));
 219                 break;
 220             }
 221
 222             avail -= frames;
 223         }
 224     }
 225
 226     return 0;
 227 }
 228
 229 static ALuint ALSANoMMapProc(ALvoid *ptr)
 230 {
 231     ALCdevice *pDevice = (ALCdevice*)ptr;
 232     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 233     snd_pcm_sframes_t avail;
 234     char *WritePtr;
 235
 236     while(!data->killNow)
 237     {
 238         SuspendContext(NULL);
 239         aluMixData(pDevice->Context, data->buffer, data->size, pDevice->Format);
 240         ProcessContext(NULL);
 241
 242         WritePtr = data->buffer;
 243         avail = (snd_pcm_uframes_t)data->size / psnd_pcm_frames_to_bytes(data->pcmHandle, 1);
 244         while(avail > 0)
 245         {
 246             int ret = psnd_pcm_writei(data->pcmHandle, WritePtr, avail);
 247             switch (ret)
 248             {
 249             case -EAGAIN:
 250                 continue;
 251             case -ESTRPIPE:
 252                 while((ret=psnd_pcm_resume(data->pcmHandle)) == -EAGAIN)
 253                     Sleep(1);
 254                 break;
 255             case -EPIPE:
 256                 break;
 257             default:
 258                 if (ret >= 0)
 259                 {
 260                     WritePtr += psnd_pcm_frames_to_bytes(data->pcmHandle, ret);
 261                     avail -= ret;
 262                 }
 263                 break;
 264             }
 265             if (ret < 0)
 266             {
 267                 ret = psnd_pcm_prepare(data->pcmHandle);
 268                 if(ret < 0)
 269                     break;
 270             }
 271         }
 272     }
 273
 274     return 0;
 275 }
 276
 277 static ALCboolean alsa_open_playback(ALCdevice *device, const ALCchar *deviceName)
 278 {
 279     snd_pcm_uframes_t bufferSizeInFrames;
 280     snd_pcm_hw_params_t *p = NULL;
 281     snd_pcm_access_t access;
 282     unsigned int periods;
 283     alsa_data *data;
 284     char driver[64];
 285     const char *str;
 286     int allowmmap;
 287     char *err;
 288     int i;
 289
 290     if(!alsa_handle)
 291         return ALC_FALSE;
 292
 293     strncpy(driver, GetConfigValue("alsa", "device", "default"), sizeof(driver)-1);
 294     driver[sizeof(driver)-1] = 0;
 295     if(deviceName)
 296     {
 297         size_t idx;
 298
 299         for(idx = 0;idx < MAX_ALL_DEVICES;idx++)
 300         {
 301             if(allDevNameMap[idx].name &&
 302                strcmp(deviceName, allDevNameMap[idx].name) == 0)
 303             {
 304                 device->szDeviceName = allDevNameMap[idx].name;
 305                 if(idx > 0)
 306                     sprintf(driver, "hw:%d,%d", allDevNameMap[idx].card, allDevNameMap[idx].dev);
 307                 goto open_alsa;
 308             }
 309         }
 310         for(idx = 0;idx < MAX_DEVICES;idx++)
 311         {
 312             if(alsaDeviceList[idx] &&
 313                strcmp(deviceName, alsaDeviceList[idx]) == 0)
 314             {
 315                 device->szDeviceName = alsaDeviceList[idx];
 316                 if(idx > 0)
 317                     sprintf(driver, "hw:%zd,0", idx-1);
 318                 goto open_alsa;
 319             }
 320         }
 321         return ALC_FALSE;
 322     }
 323     else
 324         device->szDeviceName = alsaDeviceList[0];
 325
 326 open_alsa:
 327     data = (alsa_data*)calloc(1, sizeof(alsa_data));
 328
 329     i = psnd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 330     if(i < 0)
 331     {
 332         Sleep(200);
 333         i = psnd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
 334     }
 335     if(i >= 0)
 336     {
 337         i = psnd_pcm_nonblock(data->pcmHandle, 0);
 338         if(i < 0)
 339             psnd_pcm_close(data->pcmHandle);
 340     }
 341     if(i < 0)
 342     {
 343         free(data);
 344         AL_PRINT("Could not open playback device '%s': %s\n", driver, psnd_strerror(i));
 345         return ALC_FALSE;
 346     }
 347
 348     switch(aluBytesFromFormat(device->Format))
 349     {
 350         case 1:
 351             data->format = SND_PCM_FORMAT_U8;
 352             break;
 353         case 2:
 354             data->format = SND_PCM_FORMAT_S16;
 355             break;
 356         default:
 357             data->format = SND_PCM_FORMAT_UNKNOWN;
 358             AL_PRINT("Unknown format?! %x\n", device->Format);
 359     }
 360
 361     periods = GetConfigValueInt("alsa", "periods", 0);
 362     bufferSizeInFrames = device->UpdateSize;
 363
 364     str = GetConfigValue("alsa", "mmap", "true");
 365     allowmmap = (strcasecmp(str, "true") == 0 ||
 366                  strcasecmp(str, "yes") == 0 ||
 367                  strcasecmp(str, "on") == 0 ||
 368                  atoi(str) != 0);
 369
 370     psnd_pcm_hw_params_malloc(&p);
 371 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 372     /* start with the largest configuration space possible */
 373     if(!(ok(psnd_pcm_hw_params_any(data->pcmHandle, p), "any") &&
 374          /* set interleaved access */
 375          ((allowmmap && ok(psnd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_MMAP_INTERLEAVED), "set access")) ||
 376           ok(psnd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED), "set access")) &&
 377          /* set format (implicitly sets sample bits) */
 378          ok(psnd_pcm_hw_params_set_format(data->pcmHandle, p, data->format), "set format") &&
 379          /* set channels (implicitly sets frame bits) */
 380          ok(psnd_pcm_hw_params_set_channels(data->pcmHandle, p, aluChannelsFromFormat(device->Format)), "set channels") &&
 381          /* set periods (implicitly constrains period/buffer parameters) */
 382          (!periods || ok(psnd_pcm_hw_params_set_periods_near(data->pcmHandle, p, &periods, NULL), "set periods near")) &&
 383          /* set rate (implicitly constrains period/buffer parameters) */
 384          ok(psnd_pcm_hw_params_set_rate_near(data->pcmHandle, p, &device->Frequency, NULL), "set rate near") &&
 385          /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
 386          ok(psnd_pcm_hw_params_set_buffer_size_near(data->pcmHandle, p, &bufferSizeInFrames), "set buffer size near") &&
 387          /* install and prepare hardware configuration */
 388          ok(psnd_pcm_hw_params(data->pcmHandle, p), "set params")))
 389     {
 390         AL_PRINT("%s failed: %s\n", err, psnd_strerror(i));
 391         psnd_pcm_hw_params_free(p);
 392         psnd_pcm_close(data->pcmHandle);
 393         free(data);
 394         return ALC_FALSE;
 395     }
 396 #undef ok
 397
 398     if((i=psnd_pcm_hw_params_get_access(p, &access)) < 0)
 399     {
 400         AL_PRINT("get_access failed: %s\n", psnd_strerror(i));
 401         psnd_pcm_hw_params_free(p);
 402         psnd_pcm_close(data->pcmHandle);
 403         free(data);
 404         return ALC_FALSE;
 405     }
 406
 407     if((i=psnd_pcm_hw_params_get_period_size(p, &bufferSizeInFrames, NULL)) < 0)
 408     {
 409         AL_PRINT("get_period_size failed: %s\n", psnd_strerror(i));
 410         psnd_pcm_hw_params_free(p);
 411         psnd_pcm_close(data->pcmHandle);
 412         free(data);
 413         return ALC_FALSE;
 414     }
 415
 416     psnd_pcm_hw_params_free(p);
 417
 418     device->UpdateSize = bufferSizeInFrames;
 419
 420     data->size = psnd_pcm_frames_to_bytes(data->pcmHandle, device->UpdateSize);
 421     if(access == SND_PCM_ACCESS_RW_INTERLEAVED)
 422     {
 423         data->buffer = malloc(data->size);
 424         if(!data->buffer)
 425         {
 426             AL_PRINT("buffer malloc failed\n");
 427             psnd_pcm_close(data->pcmHandle);
 428             free(data);
 429             return ALC_FALSE;
 430         }
 431     }
 432     else
 433     {
 434         i = psnd_pcm_prepare(data->pcmHandle);
 435         if(i < 0)
 436         {
 437             AL_PRINT("prepare error: %s\n", psnd_strerror(i));
 438             psnd_pcm_close(data->pcmHandle);
 439             free(data->buffer);
 440             free(data);
 441             return ALC_FALSE;
 442         }
 443     }
 444
 445     device->ExtraData = data;
 446     if(access == SND_PCM_ACCESS_RW_INTERLEAVED)
 447         data->thread = StartThread(ALSANoMMapProc, device);
 448     else
 449         data->thread = StartThread(ALSAProc, device);
 450     if(data->thread == NULL)
 451     {
 452         psnd_pcm_close(data->pcmHandle);
 453         device->ExtraData = NULL;
 454         free(data->buffer);
 455         free(data);
 456         return ALC_FALSE;
 457     }
 458
 459     return ALC_TRUE;
 460 }
 461
 462 static void alsa_close_playback(ALCdevice *device)
 463 {
 464     alsa_data *data = (alsa_data*)device->ExtraData;
 465     data->killNow = 1;
 466     StopThread(data->thread);
 467     psnd_pcm_close(data->pcmHandle);
 468
 469     free(data->buffer);
 470     free(data);
 471     device->ExtraData = NULL;
 472 }
 473
 474
 475 static ALCboolean alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 476 {
 477     snd_pcm_format_t alsaFormat;
 478     snd_pcm_hw_params_t *p;
 479     snd_pcm_uframes_t bufferSizeInFrames;
 480     alsa_data *data;
 481     char driver[64];
 482     char *err;
 483     int i;
 484
 485     if(!alsa_handle)
 486         return ALC_FALSE;
 487
 488     strncpy(driver, GetConfigValue("alsa", "capture", "default"), sizeof(driver)-1);
 489     driver[sizeof(driver)-1] = 0;
 490     if(deviceName)
 491     {
 492         size_t idx;
 493
 494         for(idx = 0;idx < MAX_ALL_DEVICES;idx++)
 495         {
 496             if(allCaptureDevNameMap[idx].name &&
 497                strcmp(deviceName, allCaptureDevNameMap[idx].name) == 0)
 498             {
 499                 pDevice->szDeviceName = allCaptureDevNameMap[idx].name;
 500                 if(idx > 0)
 501                     sprintf(driver, "hw:%d,%d", allCaptureDevNameMap[idx].card, allCaptureDevNameMap[idx].dev);
 502                 goto open_alsa;
 503             }
 504         }
 505         return ALC_FALSE;
 506     }
 507     else
 508         pDevice->szDeviceName = allCaptureDevNameMap[0].name;
 509
 510 open_alsa:
 511     data = (alsa_data*)calloc(1, sizeof(alsa_data));
 512
 513     i = psnd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
 514     if(i < 0)
 515     {
 516         Sleep(200);
 517         i = psnd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
 518     }
 519     if(i >= 0)
 520     {
 521         i = psnd_pcm_nonblock(data->pcmHandle, 0);
 522         if(i < 0)
 523             psnd_pcm_close(data->pcmHandle);
 524     }
 525     if(i < 0)
 526     {
 527         free(data);
 528         AL_PRINT("Could not open capture device '%s': %s\n", driver, psnd_strerror(i));
 529         return ALC_FALSE;
 530     }
 531
 532     switch(aluBytesFromFormat(format))
 533     {
 534         case 1:
 535             alsaFormat = SND_PCM_FORMAT_U8;
 536             break;
 537         case 2:
 538             alsaFormat = SND_PCM_FORMAT_S16;
 539             break;
 540         default:
 541             alsaFormat = SND_PCM_FORMAT_UNKNOWN;
 542             AL_PRINT("Unknown format?! %x\n", format);
 543     }
 544
 545     bufferSizeInFrames = SampleSize;
 546
 547     psnd_pcm_hw_params_malloc(&p);
 548 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 549     /* start with the largest configuration space possible */
 550     if(!(ok(psnd_pcm_hw_params_any(data->pcmHandle, p), "any") &&
 551          /* set interleaved access */
 552          ok(psnd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_MMAP_INTERLEAVED), "set access") &&
 553          /* set format (implicitly sets sample bits) */
 554          ok(psnd_pcm_hw_params_set_format(data->pcmHandle, p, alsaFormat), "set format") &&
 555          /* set channels (implicitly sets frame bits) */
 556          ok(psnd_pcm_hw_params_set_channels(data->pcmHandle, p, aluChannelsFromFormat(pDevice->Format)), "set channels") &&
 557          /* set rate (implicitly constrains period/buffer parameters) */
 558          ok(psnd_pcm_hw_params_set_rate(data->pcmHandle, p, frequency, 0), "set rate") &&
 559          /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
 560          ok(psnd_pcm_hw_params_set_buffer_size_min(data->pcmHandle, p, &bufferSizeInFrames), "set buffer size min") &&
 561          /* install and prepare hardware configuration */
 562          ok(psnd_pcm_hw_params(data->pcmHandle, p), "set params")))
 563     {
 564         AL_PRINT("%s failed: %s\n", err, psnd_strerror(i));
 565         psnd_pcm_hw_params_free(p);
 566         psnd_pcm_close(data->pcmHandle);
 567         free(data);
 568         return ALC_FALSE;
 569     }
 570 #undef ok
 571     psnd_pcm_hw_params_free(p);
 572
 573     i = psnd_pcm_prepare(data->pcmHandle);
 574     if(i < 0)
 575     {
 576         AL_PRINT("prepare error: %s\n", psnd_strerror(i));
 577         psnd_pcm_close(data->pcmHandle);
 578         free(data);
 579         return ALC_FALSE;
 580     }
 581
 582     pDevice->ExtraData = data;
 583     return ALC_TRUE;
 584 }
 585
 586 static void alsa_close_capture(ALCdevice *pDevice)
 587 {
 588     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 589     psnd_pcm_close(data->pcmHandle);
 590
 591     free(data);
 592     pDevice->ExtraData = NULL;
 593 }
 594
 595 static void alsa_start_capture(ALCdevice *pDevice)
 596 {
 597     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 598     psnd_pcm_prepare(data->pcmHandle);
 599     psnd_pcm_start(data->pcmHandle);
 600 }
 601
 602 static void alsa_stop_capture(ALCdevice *pDevice)
 603 {
 604     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 605     psnd_pcm_drain(data->pcmHandle);
 606 }
 607
 608 static void alsa_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 609 {
 610     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 611     const snd_pcm_channel_area_t *areas = NULL;
 612     snd_pcm_sframes_t frames, commitres;
 613     snd_pcm_uframes_t size, offset;
 614     int err;
 615
 616     frames = psnd_pcm_avail_update(data->pcmHandle);
 617     if(frames < 0)
 618     {
 619         err = xrun_recovery(data->pcmHandle, frames);
 620         if (err < 0)
 621             AL_PRINT("available update failed: %s\n", psnd_strerror(err));
 622         else
 623             frames = psnd_pcm_avail_update(data->pcmHandle);
 624     }
 625     if (frames < (snd_pcm_sframes_t)lSamples)
 626     {
 627         SetALCError(ALC_INVALID_VALUE);
 628         return;
 629     }
 630
 631     // it is possible that contiguous areas are smaller, thus we use a loop
 632     while (lSamples > 0)
 633     {
 634         char *Pointer;
 635         int Count;
 636
 637         size = lSamples;
 638         err = psnd_pcm_mmap_begin(data->pcmHandle, &areas, &offset, &size);
 639         if (err < 0)
 640         {
 641             err = xrun_recovery(data->pcmHandle, err);
 642             if (err < 0)
 643             {
 644                 AL_PRINT("mmap begin error: %s\n", psnd_strerror(err));
 645                 break;
 646             }
 647             continue;
 648         }
 649
 650         Pointer = (char*)areas->addr + (offset * areas->step / 8);
 651         Count = psnd_pcm_frames_to_bytes(data->pcmHandle, size);
 652
 653         memcpy(pBuffer, Pointer, Count);
 654         pBuffer = (char*)pBuffer + Count;
 655
 656         commitres = psnd_pcm_mmap_commit(data->pcmHandle, offset, size);
 657         if (commitres < 0 || (commitres-size) != 0)
 658         {
 659            AL_PRINT("mmap commit error: %s\n",
 660                     psnd_strerror(commitres >= 0 ? -EPIPE : commitres));
 661            break;
 662         }
 663
 664         lSamples -= size;
 665     }
 666 }
 667
 668 static ALCuint alsa_available_samples(ALCdevice *pDevice)
 669 {
 670     alsa_data *data = (alsa_data*)pDevice->ExtraData;
 671     snd_pcm_sframes_t frames = psnd_pcm_avail_update(data->pcmHandle);
 672     if(frames < 0)
 673     {
 674         int err = xrun_recovery(data->pcmHandle, frames);
 675         if (err < 0)
 676             AL_PRINT("available update failed: %s\n", psnd_strerror(err));
 677         else
 678             frames = psnd_pcm_avail_update(data->pcmHandle);
 679         if(frames < 0) /* ew.. */
 680             SetALCError(ALC_INVALID_DEVICE);
 681     }
 682     return max(frames, 0);
 683 }
 684
 685
 686 BackendFuncs alsa_funcs = {
 687     alsa_open_playback,
 688     alsa_close_playback,
 689     alsa_open_capture,
 690     alsa_close_capture,
 691     alsa_start_capture,
 692     alsa_stop_capture,
 693     alsa_capture_samples,
 694     alsa_available_samples
 695 };
 696
 697 void alc_alsa_init(BackendFuncs *func_list)
 698 {
 699     snd_ctl_t *handle;
 700     int card, err, dev, idx = 1;
 701     snd_ctl_card_info_t *info;
 702     snd_pcm_info_t *pcminfo;
 703     snd_pcm_stream_t stream = SND_PCM_STREAM_PLAYBACK;
 704     char name[128];
 705     char *str;
 706
 707     *func_list = alsa_funcs;
 708
 709 #ifdef HAVE_DLFCN_H
 710     alsa_handle = dlopen("libasound.so.2", RTLD_NOW);
 711     if(!alsa_handle)
 712         return;
 713     dlerror();
 714
 715 #define LOAD_FUNC(f) do { \
 716     p##f = (typeof(f)*)dlsym(alsa_handle, #f); \
 717     if((str=dlerror()) != NULL) \
 718     { \
 719         dlclose(alsa_handle); \
 720         alsa_handle = NULL; \
 721         AL_PRINT("Could not load %s from libasound.so.2: %s\n", #f, str); \
 722         return; \
 723     } \
 724 } while(0)
 725 #else
 726     str = NULL;
 727     alsa_handle = 0xDEADBEEF;
 728 #define LOAD_FUNC(f) p##f = f
 729 #endif
 730
 731 LOAD_FUNC(snd_strerror);
 732 LOAD_FUNC(snd_pcm_open);
 733 LOAD_FUNC(snd_pcm_close);
 734 LOAD_FUNC(snd_pcm_nonblock);
 735 LOAD_FUNC(snd_pcm_frames_to_bytes);
 736 LOAD_FUNC(snd_pcm_hw_params_malloc);
 737 LOAD_FUNC(snd_pcm_hw_params_free);
 738 LOAD_FUNC(snd_pcm_hw_params_any);
 739 LOAD_FUNC(snd_pcm_hw_params_set_access);
 740 LOAD_FUNC(snd_pcm_hw_params_set_format);
 741 LOAD_FUNC(snd_pcm_hw_params_set_channels);
 742 LOAD_FUNC(snd_pcm_hw_params_set_periods_near);
 743 LOAD_FUNC(snd_pcm_hw_params_set_rate_near);
 744 LOAD_FUNC(snd_pcm_hw_params_set_rate);
 745 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near);
 746 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min);
 747 LOAD_FUNC(snd_pcm_hw_params_get_period_size);
 748 LOAD_FUNC(snd_pcm_hw_params_get_access);
 749 LOAD_FUNC(snd_pcm_hw_params);
 750 LOAD_FUNC(snd_pcm_prepare);
 751 LOAD_FUNC(snd_pcm_start);
 752 LOAD_FUNC(snd_pcm_resume);
 753 LOAD_FUNC(snd_pcm_wait);
 754 LOAD_FUNC(snd_pcm_state);
 755 LOAD_FUNC(snd_pcm_avail_update);
 756 LOAD_FUNC(snd_pcm_areas_silence);
 757 LOAD_FUNC(snd_pcm_mmap_begin);
 758 LOAD_FUNC(snd_pcm_mmap_commit);
 759 LOAD_FUNC(snd_pcm_writei);
 760 LOAD_FUNC(snd_pcm_drain);
 761
 762 LOAD_FUNC(snd_pcm_info_malloc);
 763 LOAD_FUNC(snd_pcm_info_free);
 764 LOAD_FUNC(snd_pcm_info_set_device);
 765 LOAD_FUNC(snd_pcm_info_set_subdevice);
 766 LOAD_FUNC(snd_pcm_info_set_stream);
 767 LOAD_FUNC(snd_pcm_info_get_name);
 768 LOAD_FUNC(snd_ctl_pcm_next_device);
 769 LOAD_FUNC(snd_ctl_pcm_info);
 770 LOAD_FUNC(snd_ctl_open);
 771 LOAD_FUNC(snd_ctl_close);
 772 LOAD_FUNC(snd_ctl_card_info_malloc);
 773 LOAD_FUNC(snd_ctl_card_info_free);
 774 LOAD_FUNC(snd_ctl_card_info);
 775 LOAD_FUNC(snd_ctl_card_info_get_name);
 776 LOAD_FUNC(snd_card_next);
 777
 778 #undef LOAD_FUNC
 779
 780     psnd_ctl_card_info_malloc(&info);
 781     psnd_pcm_info_malloc(&pcminfo);
 782
 783     card = -1;
 784     if(psnd_card_next(&card) < 0 || card < 0)
 785         AL_PRINT("no playback cards found...\n");
 786     else
 787     {
 788         alsaDeviceList[0] = AppendDeviceList("ALSA Software on default");
 789         allDevNameMap[0].name = AppendAllDeviceList("ALSA Software on default");
 790     }
 791
 792     while (card >= 0) {
 793         int firstDev = 1;
 794
 795         sprintf(name, "hw:%d", card);
 796         if ((err = psnd_ctl_open(&handle, name, 0)) < 0) {
 797             AL_PRINT("control open (%i): %s\n", card, psnd_strerror(err));
 798             goto next_card;
 799         }
 800         if ((err = psnd_ctl_card_info(handle, info)) < 0) {
 801             AL_PRINT("control hardware info (%i): %s\n", card, psnd_strerror(err));
 802             psnd_ctl_close(handle);
 803             goto next_card;
 804         }
 805
 806         dev = -1;
 807         while (idx < MAX_ALL_DEVICES) {
 808             const char *cname, *dname;
 809
 810             if (psnd_ctl_pcm_next_device(handle, &dev)<0)
 811                 AL_PRINT("snd_ctl_pcm_next_device failed\n");
 812             if (dev < 0)
 813                 break;
 814
 815             if(firstDev && card < MAX_DEVICES-1) {
 816                 firstDev = 0;
 817                 snprintf(name, sizeof(name), "ALSA Software on %s",
 818                          psnd_ctl_card_info_get_name(info));
 819                 alsaDeviceList[card+1] = AppendDeviceList(name);
 820             }
 821
 822             psnd_pcm_info_set_device(pcminfo, dev);
 823             psnd_pcm_info_set_subdevice(pcminfo, 0);
 824             psnd_pcm_info_set_stream(pcminfo, stream);
 825             if ((err = psnd_ctl_pcm_info(handle, pcminfo)) < 0) {
 826                 if (err != -ENOENT)
 827                     AL_PRINT("control digital audio info (%i): %s\n", card, psnd_strerror(err));
 828                 continue;
 829             }
 830
 831             cname = psnd_ctl_card_info_get_name(info);
 832             dname = psnd_pcm_info_get_name(pcminfo);
 833             snprintf(name, sizeof(name), "ALSA Software on %s [%s]",
 834                      cname, dname);
 835             allDevNameMap[idx].name = AppendAllDeviceList(name);
 836             allDevNameMap[idx].card = card;
 837             allDevNameMap[idx].dev = dev;
 838             idx++;
 839         }
 840         psnd_ctl_close(handle);
 841 next_card:
 842         if(psnd_card_next(&card) < 0) {
 843             AL_PRINT("snd_card_next failed\n");
 844             break;
 845         }
 846     }
 847
 848
 849     stream = SND_PCM_STREAM_CAPTURE;
 850
 851     card = -1;
 852     if(psnd_card_next(&card) < 0 || card < 0) {
 853         AL_PRINT("no capture cards found...\n");
 854         psnd_pcm_info_free(pcminfo);
 855         psnd_ctl_card_info_free(info);
 856         return;
 857     }
 858
 859     allCaptureDevNameMap[0].name = AppendCaptureDeviceList("ALSA Capture on default");
 860     idx = 1;
 861
 862     while (card >= 0) {
 863         sprintf(name, "hw:%d", card);
 864         handle = NULL;
 865         if ((err = psnd_ctl_open(&handle, name, 0)) < 0) {
 866             AL_PRINT("control open (%i): %s\n", card, psnd_strerror(err));
 867         }
 868         if (err >= 0 && (err = psnd_ctl_card_info(handle, info)) < 0) {
 869             AL_PRINT("control hardware info (%i): %s\n", card, psnd_strerror(err));
 870         }
 871         else if (err >= 0)
 872         {
 873             dev = -1;
 874             while (idx < MAX_ALL_DEVICES) {
 875                 const char *cname, *dname;
 876
 877                 if (psnd_ctl_pcm_next_device(handle, &dev)<0)
 878                     AL_PRINT("snd_ctl_pcm_next_device failed\n");
 879                 if (dev < 0)
 880                     break;
 881                 psnd_pcm_info_set_device(pcminfo, dev);
 882                 psnd_pcm_info_set_subdevice(pcminfo, 0);
 883                 psnd_pcm_info_set_stream(pcminfo, stream);
 884                 if ((err = psnd_ctl_pcm_info(handle, pcminfo)) < 0) {
 885                     if (err != -ENOENT)
 886                         AL_PRINT("control digital audio info (%i): %s\n", card, psnd_strerror(err));
 887                     continue;
 888                 }
 889
 890                 cname = psnd_ctl_card_info_get_name(info);
 891                 dname = psnd_pcm_info_get_name(pcminfo);
 892                 snprintf(name, sizeof(name), "ALSA Capture on %s [%s]",
 893                          cname, dname);
 894                 allCaptureDevNameMap[idx].name = AppendCaptureDeviceList(name);
 895                 allCaptureDevNameMap[idx].card = card;
 896                 allCaptureDevNameMap[idx].dev = dev;
 897                 idx++;
 898             }
 899         }
 900         if(handle) psnd_ctl_close(handle);
 901         if(psnd_card_next(&card) < 0) {
 902             AL_PRINT("snd_card_next failed\n");
 903             break;
 904         }
 905     }
 906     psnd_pcm_info_free(pcminfo);
 907     psnd_ctl_card_info_free(info);
 908 }