audio/alsaaudio.c

   1 /*
   2  * QEMU ALSA audio driver
   3  *
   4  * Copyright (c) 2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <alsa/asoundlib.h>
  25 #include "qemu-common.h"
  26 #include "qemu-char.h"
  27 #include "audio.h"
  28
  29 #if QEMU_GNUC_PREREQ(4, 3)
  30 #pragma GCC diagnostic ignored "-Waddress"
  31 #endif
  32
  33 #define AUDIO_CAP "alsa"
  34 #include "audio_int.h"
  35
  36 struct pollhlp {
  37     snd_pcm_t *handle;
  38     struct pollfd *pfds;
  39     int count;
  40     int mask;
  41 };
  42
  43 typedef struct ALSAVoiceOut {
  44     HWVoiceOut hw;
  45     int wpos;
  46     int pending;
  47     void *pcm_buf;
  48     snd_pcm_t *handle;
  49     struct pollhlp pollhlp;
  50 } ALSAVoiceOut;
  51
  52 typedef struct ALSAVoiceIn {
  53     HWVoiceIn hw;
  54     snd_pcm_t *handle;
  55     void *pcm_buf;
  56     struct pollhlp pollhlp;
  57 } ALSAVoiceIn;
  58
  59 static struct {
  60     int size_in_usec_in;
  61     int size_in_usec_out;
  62     const char *pcm_name_in;
  63     const char *pcm_name_out;
  64     unsigned int buffer_size_in;
  65     unsigned int period_size_in;
  66     unsigned int buffer_size_out;
  67     unsigned int period_size_out;
  68     unsigned int threshold;
  69
  70     int buffer_size_in_overridden;
  71     int period_size_in_overridden;
  72
  73     int buffer_size_out_overridden;
  74     int period_size_out_overridden;
  75     int verbose;
  76 } conf = {
  77     .buffer_size_out = 1024,
  78     .pcm_name_out = "default",
  79     .pcm_name_in = "default",
  80 };
  81
  82 struct alsa_params_req {
  83     int freq;
  84     snd_pcm_format_t fmt;
  85     int nchannels;
  86     int size_in_usec;
  87     int override_mask;
  88     unsigned int buffer_size;
  89     unsigned int period_size;
  90 };
  91
  92 struct alsa_params_obt {
  93     int freq;
  94     audfmt_e fmt;
  95     int endianness;
  96     int nchannels;
  97     snd_pcm_uframes_t samples;
  98 };
  99
 100 static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
 101 {
 102     va_list ap;
 103
 104     va_start (ap, fmt);
 105     AUD_vlog (AUDIO_CAP, fmt, ap);
 106     va_end (ap);
 107
 108     AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
 109 }
 110
 111 static void GCC_FMT_ATTR (3, 4) alsa_logerr2 (
 112     int err,
 113     const char *typ,
 114     const char *fmt,
 115     ...
 116     )
 117 {
 118     va_list ap;
 119
 120     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 121
 122     va_start (ap, fmt);
 123     AUD_vlog (AUDIO_CAP, fmt, ap);
 124     va_end (ap);
 125
 126     AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
 127 }
 128
 129 static void alsa_fini_poll (struct pollhlp *hlp)
 130 {
 131     int i;
 132     struct pollfd *pfds = hlp->pfds;
 133
 134     if (pfds) {
 135         for (i = 0; i < hlp->count; ++i) {
 136             qemu_set_fd_handler (pfds[i].fd, NULL, NULL, NULL);
 137         }
 138         qemu_free (pfds);
 139     }
 140     hlp->pfds = NULL;
 141     hlp->count = 0;
 142     hlp->handle = NULL;
 143 }
 144
 145 static void alsa_anal_close1 (snd_pcm_t **handlep)
 146 {
 147     int err = snd_pcm_close (*handlep);
 148     if (err) {
 149         alsa_logerr (err, "Failed to close PCM handle %p\n", *handlep);
 150     }
 151     *handlep = NULL;
 152 }
 153
 154 static void alsa_anal_close (snd_pcm_t **handlep, struct pollhlp *hlp)
 155 {
 156     alsa_fini_poll (hlp);
 157     alsa_anal_close1 (handlep);
 158 }
 159
 160 static int alsa_recover (snd_pcm_t *handle)
 161 {
 162     int err = snd_pcm_prepare (handle);
 163     if (err < 0) {
 164         alsa_logerr (err, "Failed to prepare handle %p\n", handle);
 165         return -1;
 166     }
 167     return 0;
 168 }
 169
 170 static int alsa_resume (snd_pcm_t *handle)
 171 {
 172     int err = snd_pcm_resume (handle);
 173     if (err < 0) {
 174         alsa_logerr (err, "Failed to resume handle %p\n", handle);
 175         return -1;
 176     }
 177     return 0;
 178 }
 179
 180 static void alsa_poll_handler (void *opaque)
 181 {
 182     int err, count;
 183     snd_pcm_state_t state;
 184     struct pollhlp *hlp = opaque;
 185     unsigned short revents;
 186
 187     count = poll (hlp->pfds, hlp->count, 0);
 188     if (count < 0) {
 189         dolog ("alsa_poll_handler: poll %s\n", strerror (errno));
 190         return;
 191     }
 192
 193     if (!count) {
 194         return;
 195     }
 196
 197     /* XXX: ALSA example uses initial count, not the one returned by
 198        poll, correct? */
 199     err = snd_pcm_poll_descriptors_revents (hlp->handle, hlp->pfds,
 200                                             hlp->count, &revents);
 201     if (err < 0) {
 202         alsa_logerr (err, "snd_pcm_poll_descriptors_revents");
 203         return;
 204     }
 205
 206     if (!(revents & hlp->mask)) {
 207         if (conf.verbose) {
 208             dolog ("revents = %d\n", revents);
 209         }
 210         return;
 211     }
 212
 213     state = snd_pcm_state (hlp->handle);
 214     switch (state) {
 215     case SND_PCM_STATE_XRUN:
 216         alsa_recover (hlp->handle);
 217         break;
 218
 219     case SND_PCM_STATE_SUSPENDED:
 220         alsa_resume (hlp->handle);
 221         break;
 222
 223     case SND_PCM_STATE_PREPARED:
 224         audio_run ("alsa run (prepared)");
 225         break;
 226
 227     case SND_PCM_STATE_RUNNING:
 228         audio_run ("alsa run (running)");
 229         break;
 230
 231     default:
 232         dolog ("Unexpected state %d\n", state);
 233     }
 234 }
 235
 236 static int alsa_poll_helper (snd_pcm_t *handle, struct pollhlp *hlp, int mask)
 237 {
 238     int i, count, err;
 239     struct pollfd *pfds;
 240
 241     count = snd_pcm_poll_descriptors_count (handle);
 242     if (count <= 0) {
 243         dolog ("Could not initialize poll mode\n"
 244                "Invalid number of poll descriptors %d\n", count);
 245         return -1;
 246     }
 247
 248     pfds = audio_calloc ("alsa_poll_helper", count, sizeof (*pfds));
 249     if (!pfds) {
 250         dolog ("Could not initialize poll mode\n");
 251         return -1;
 252     }
 253
 254     err = snd_pcm_poll_descriptors (handle, pfds, count);
 255     if (err < 0) {
 256         alsa_logerr (err, "Could not initialize poll mode\n"
 257                      "Could not obtain poll descriptors\n");
 258         qemu_free (pfds);
 259         return -1;
 260     }
 261
 262     for (i = 0; i < count; ++i) {
 263         if (pfds[i].events & POLLIN) {
 264             err = qemu_set_fd_handler (pfds[i].fd, alsa_poll_handler,
 265                                        NULL, hlp);
 266         }
 267         if (pfds[i].events & POLLOUT) {
 268             if (conf.verbose) {
 269                 dolog ("POLLOUT %d %d\n", i, pfds[i].fd);
 270             }
 271             err = qemu_set_fd_handler (pfds[i].fd, NULL,
 272                                        alsa_poll_handler, hlp);
 273         }
 274         if (conf.verbose) {
 275             dolog ("Set handler events=%#x index=%d fd=%d err=%d\n",
 276                    pfds[i].events, i, pfds[i].fd, err);
 277         }
 278
 279         if (err) {
 280             dolog ("Failed to set handler events=%#x index=%d fd=%d err=%d\n",
 281                    pfds[i].events, i, pfds[i].fd, err);
 282
 283             while (i--) {
 284                 qemu_set_fd_handler (pfds[i].fd, NULL, NULL, NULL);
 285             }
 286             qemu_free (pfds);
 287             return -1;
 288         }
 289     }
 290     hlp->pfds = pfds;
 291     hlp->count = count;
 292     hlp->handle = handle;
 293     hlp->mask = mask;
 294     return 0;
 295 }
 296
 297 static int alsa_poll_out (HWVoiceOut *hw)
 298 {
 299     ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
 300
 301     return alsa_poll_helper (alsa->handle, &alsa->pollhlp, POLLOUT);
 302 }
 303
 304 static int alsa_poll_in (HWVoiceIn *hw)
 305 {
 306     ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
 307
 308     return alsa_poll_helper (alsa->handle, &alsa->pollhlp, POLLIN);
 309 }
 310
 311 static int alsa_write (SWVoiceOut *sw, void *buf, int len)
 312 {
 313     return audio_pcm_sw_write (sw, buf, len);
 314 }
 315
 316 static snd_pcm_format_t aud_to_alsafmt (audfmt_e fmt)
 317 {
 318     switch (fmt) {
 319     case AUD_FMT_S8:
 320         return SND_PCM_FORMAT_S8;
 321
 322     case AUD_FMT_U8:
 323         return SND_PCM_FORMAT_U8;
 324
 325     case AUD_FMT_S16:
 326         return SND_PCM_FORMAT_S16_LE;
 327
 328     case AUD_FMT_U16:
 329         return SND_PCM_FORMAT_U16_LE;
 330
 331     case AUD_FMT_S32:
 332         return SND_PCM_FORMAT_S32_LE;
 333
 334     case AUD_FMT_U32:
 335         return SND_PCM_FORMAT_U32_LE;
 336
 337     default:
 338         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 339 #ifdef DEBUG_AUDIO
 340         abort ();
 341 #endif
 342         return SND_PCM_FORMAT_U8;
 343     }
 344 }
 345
 346 static int alsa_to_audfmt (snd_pcm_format_t alsafmt, audfmt_e *fmt,
 347                            int *endianness)
 348 {
 349     switch (alsafmt) {
 350     case SND_PCM_FORMAT_S8:
 351         *endianness = 0;
 352         *fmt = AUD_FMT_S8;
 353         break;
 354
 355     case SND_PCM_FORMAT_U8:
 356         *endianness = 0;
 357         *fmt = AUD_FMT_U8;
 358         break;
 359
 360     case SND_PCM_FORMAT_S16_LE:
 361         *endianness = 0;
 362         *fmt = AUD_FMT_S16;
 363         break;
 364
 365     case SND_PCM_FORMAT_U16_LE:
 366         *endianness = 0;
 367         *fmt = AUD_FMT_U16;
 368         break;
 369
 370     case SND_PCM_FORMAT_S16_BE:
 371         *endianness = 1;
 372         *fmt = AUD_FMT_S16;
 373         break;
 374
 375     case SND_PCM_FORMAT_U16_BE:
 376         *endianness = 1;
 377         *fmt = AUD_FMT_U16;
 378         break;
 379
 380     case SND_PCM_FORMAT_S32_LE:
 381         *endianness = 0;
 382         *fmt = AUD_FMT_S32;
 383         break;
 384
 385     case SND_PCM_FORMAT_U32_LE:
 386         *endianness = 0;
 387         *fmt = AUD_FMT_U32;
 388         break;
 389
 390     case SND_PCM_FORMAT_S32_BE:
 391         *endianness = 1;
 392         *fmt = AUD_FMT_S32;
 393         break;
 394
 395     case SND_PCM_FORMAT_U32_BE:
 396         *endianness = 1;
 397         *fmt = AUD_FMT_U32;
 398         break;
 399
 400     default:
 401         dolog ("Unrecognized audio format %d\n", alsafmt);
 402         return -1;
 403     }
 404
 405     return 0;
 406 }
 407
 408 static void alsa_dump_info (struct alsa_params_req *req,
 409                             struct alsa_params_obt *obt)
 410 {
 411     dolog ("parameter | requested value | obtained value\n");
 412     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 413     dolog ("channels  |      %10d |     %10d\n",
 414            req->nchannels, obt->nchannels);
 415     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 416     dolog ("============================================\n");
 417     dolog ("requested: buffer size %d period size %d\n",
 418            req->buffer_size, req->period_size);
 419     dolog ("obtained: samples %ld\n", obt->samples);
 420 }
 421
 422 static void alsa_set_threshold (snd_pcm_t *handle, snd_pcm_uframes_t threshold)
 423 {
 424     int err;
 425     snd_pcm_sw_params_t *sw_params;
 426
 427     snd_pcm_sw_params_alloca (&sw_params);
 428
 429     err = snd_pcm_sw_params_current (handle, sw_params);
 430     if (err < 0) {
 431         dolog ("Could not fully initialize DAC\n");
 432         alsa_logerr (err, "Failed to get current software parameters\n");
 433         return;
 434     }
 435
 436     err = snd_pcm_sw_params_set_start_threshold (handle, sw_params, threshold);
 437     if (err < 0) {
 438         dolog ("Could not fully initialize DAC\n");
 439         alsa_logerr (err, "Failed to set software threshold to %ld\n",
 440                      threshold);
 441         return;
 442     }
 443
 444     err = snd_pcm_sw_params (handle, sw_params);
 445     if (err < 0) {
 446         dolog ("Could not fully initialize DAC\n");
 447         alsa_logerr (err, "Failed to set software parameters\n");
 448         return;
 449     }
 450 }
 451
 452 static int alsa_open (int in, struct alsa_params_req *req,
 453                       struct alsa_params_obt *obt, snd_pcm_t **handlep)
 454 {
 455     snd_pcm_t *handle;
 456     snd_pcm_hw_params_t *hw_params;
 457     int err;
 458     int size_in_usec;
 459     unsigned int freq, nchannels;
 460     const char *pcm_name = in ? conf.pcm_name_in : conf.pcm_name_out;
 461     snd_pcm_uframes_t obt_buffer_size;
 462     const char *typ = in ? "ADC" : "DAC";
 463     snd_pcm_format_t obtfmt;
 464
 465     freq = req->freq;
 466     nchannels = req->nchannels;
 467     size_in_usec = req->size_in_usec;
 468
 469     snd_pcm_hw_params_alloca (&hw_params);
 470
 471     err = snd_pcm_open (
 472         &handle,
 473         pcm_name,
 474         in ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK,
 475         SND_PCM_NONBLOCK
 476         );
 477     if (err < 0) {
 478         alsa_logerr2 (err, typ, "Failed to open `%s':\n", pcm_name);
 479         return -1;
 480     }
 481
 482     err = snd_pcm_hw_params_any (handle, hw_params);
 483     if (err < 0) {
 484         alsa_logerr2 (err, typ, "Failed to initialize hardware parameters\n");
 485         goto err;
 486     }
 487
 488     err = snd_pcm_hw_params_set_access (
 489         handle,
 490         hw_params,
 491         SND_PCM_ACCESS_RW_INTERLEAVED
 492         );
 493     if (err < 0) {
 494         alsa_logerr2 (err, typ, "Failed to set access type\n");
 495         goto err;
 496     }
 497
 498     err = snd_pcm_hw_params_set_format (handle, hw_params, req->fmt);
 499     if (err < 0 && conf.verbose) {
 500         alsa_logerr2 (err, typ, "Failed to set format %d\n", req->fmt);
 501     }
 502
 503     err = snd_pcm_hw_params_set_rate_near (handle, hw_params, &freq, 0);
 504     if (err < 0) {
 505         alsa_logerr2 (err, typ, "Failed to set frequency %d\n", req->freq);
 506         goto err;
 507     }
 508
 509     err = snd_pcm_hw_params_set_channels_near (
 510         handle,
 511         hw_params,
 512         &nchannels
 513         );
 514     if (err < 0) {
 515         alsa_logerr2 (err, typ, "Failed to set number of channels %d\n",
 516                       req->nchannels);
 517         goto err;
 518     }
 519
 520     if (nchannels != 1 && nchannels != 2) {
 521         alsa_logerr2 (err, typ,
 522                       "Can not handle obtained number of channels %d\n",
 523                       nchannels);
 524         goto err;
 525     }
 526
 527     if (req->buffer_size) {
 528         unsigned long obt;
 529
 530         if (size_in_usec) {
 531             int dir = 0;
 532             unsigned int btime = req->buffer_size;
 533
 534             err = snd_pcm_hw_params_set_buffer_time_near (
 535                 handle,
 536                 hw_params,
 537                 &btime,
 538                 &dir
 539                 );
 540             obt = btime;
 541         }
 542         else {
 543             snd_pcm_uframes_t bsize = req->buffer_size;
 544
 545             err = snd_pcm_hw_params_set_buffer_size_near (
 546                 handle,
 547                 hw_params,
 548                 &bsize
 549                 );
 550             obt = bsize;
 551         }
 552         if (err < 0) {
 553             alsa_logerr2 (err, typ, "Failed to set buffer %s to %d\n",
 554                           size_in_usec ? "time" : "size", req->buffer_size);
 555             goto err;
 556         }
 557
 558         if ((req->override_mask & 2) && (obt - req->buffer_size))
 559             dolog ("Requested buffer %s %u was rejected, using %lu\n",
 560                    size_in_usec ? "time" : "size", req->buffer_size, obt);
 561     }
 562
 563     if (req->period_size) {
 564         unsigned long obt;
 565
 566         if (size_in_usec) {
 567             int dir = 0;
 568             unsigned int ptime = req->period_size;
 569
 570             err = snd_pcm_hw_params_set_period_time_near (
 571                 handle,
 572                 hw_params,
 573                 &ptime,
 574                 &dir
 575                 );
 576             obt = ptime;
 577         }
 578         else {
 579             int dir = 0;
 580             snd_pcm_uframes_t psize = req->period_size;
 581
 582             err = snd_pcm_hw_params_set_period_size_near (
 583                 handle,
 584                 hw_params,
 585                 &psize,
 586                 &dir
 587                 );
 588             obt = psize;
 589         }
 590
 591         if (err < 0) {
 592             alsa_logerr2 (err, typ, "Failed to set period %s to %d\n",
 593                           size_in_usec ? "time" : "size", req->period_size);
 594             goto err;
 595         }
 596
 597         if (((req->override_mask & 1) && (obt - req->period_size)))
 598             dolog ("Requested period %s %u was rejected, using %lu\n",
 599                    size_in_usec ? "time" : "size", req->period_size, obt);
 600     }
 601
 602     err = snd_pcm_hw_params (handle, hw_params);
 603     if (err < 0) {
 604         alsa_logerr2 (err, typ, "Failed to apply audio parameters\n");
 605         goto err;
 606     }
 607
 608     err = snd_pcm_hw_params_get_buffer_size (hw_params, &obt_buffer_size);
 609     if (err < 0) {
 610         alsa_logerr2 (err, typ, "Failed to get buffer size\n");
 611         goto err;
 612     }
 613
 614     err = snd_pcm_hw_params_get_format (hw_params, &obtfmt);
 615     if (err < 0) {
 616         alsa_logerr2 (err, typ, "Failed to get format\n");
 617         goto err;
 618     }
 619
 620     if (alsa_to_audfmt (obtfmt, &obt->fmt, &obt->endianness)) {
 621         dolog ("Invalid format was returned %d\n", obtfmt);
 622         goto err;
 623     }
 624
 625     err = snd_pcm_prepare (handle);
 626     if (err < 0) {
 627         alsa_logerr2 (err, typ, "Could not prepare handle %p\n", handle);
 628         goto err;
 629     }
 630
 631     if (!in && conf.threshold) {
 632         snd_pcm_uframes_t threshold;
 633         int bytes_per_sec;
 634
 635         bytes_per_sec = freq << (nchannels == 2);
 636
 637         switch (obt->fmt) {
 638         case AUD_FMT_S8:
 639         case AUD_FMT_U8:
 640             break;
 641
 642         case AUD_FMT_S16:
 643         case AUD_FMT_U16:
 644             bytes_per_sec <<= 1;
 645             break;
 646
 647         case AUD_FMT_S32:
 648         case AUD_FMT_U32:
 649             bytes_per_sec <<= 2;
 650             break;
 651         }
 652
 653         threshold = (conf.threshold * bytes_per_sec) / 1000;
 654         alsa_set_threshold (handle, threshold);
 655     }
 656
 657     obt->nchannels = nchannels;
 658     obt->freq = freq;
 659     obt->samples = obt_buffer_size;
 660
 661     *handlep = handle;
 662
 663     if (conf.verbose &&
 664         (obt->fmt != req->fmt ||
 665          obt->nchannels != req->nchannels ||
 666          obt->freq != req->freq)) {
 667         dolog ("Audio paramters for %s\n", typ);
 668         alsa_dump_info (req, obt);
 669     }
 670
 671 #ifdef DEBUG
 672     alsa_dump_info (req, obt);
 673 #endif
 674     return 0;
 675
 676  err:
 677     alsa_anal_close1 (&handle);
 678     return -1;
 679 }
 680
 681 static snd_pcm_sframes_t alsa_get_avail (snd_pcm_t *handle)
 682 {
 683     snd_pcm_sframes_t avail;
 684
 685     avail = snd_pcm_avail_update (handle);
 686     if (avail < 0) {
 687         if (avail == -EPIPE) {
 688             if (!alsa_recover (handle)) {
 689                 avail = snd_pcm_avail_update (handle);
 690             }
 691         }
 692
 693         if (avail < 0) {
 694             alsa_logerr (avail,
 695                          "Could not obtain number of available frames\n");
 696             return -1;
 697         }
 698     }
 699
 700     return avail;
 701 }
 702
 703 static void alsa_write_pending (ALSAVoiceOut *alsa)
 704 {
 705     HWVoiceOut *hw = &alsa->hw;
 706
 707     while (alsa->pending) {
 708         int left_till_end_samples = hw->samples - alsa->wpos;
 709         int len = audio_MIN (alsa->pending, left_till_end_samples);
 710         char *src = advance (alsa->pcm_buf, alsa->wpos << hw->info.shift);
 711
 712         while (len) {
 713             snd_pcm_sframes_t written;
 714
 715             written = snd_pcm_writei (alsa->handle, src, len);
 716
 717             if (written <= 0) {
 718                 switch (written) {
 719                 case 0:
 720                     if (conf.verbose) {
 721                         dolog ("Failed to write %d frames (wrote zero)\n", len);
 722                     }
 723                     return;
 724
 725                 case -EPIPE:
 726                     if (alsa_recover (alsa->handle)) {
 727                         alsa_logerr (written, "Failed to write %d frames\n",
 728                                      len);
 729                         return;
 730                     }
 731                     if (conf.verbose) {
 732                         dolog ("Recovering from playback xrun\n");
 733                     }
 734                     continue;
 735
 736                 case -ESTRPIPE:
 737                     /* stream is suspended and waiting for an
 738                        application recovery */
 739                     if (alsa_resume (alsa->handle)) {
 740                         alsa_logerr (written, "Failed to write %d frames\n",
 741                                      len);
 742                         return;
 743                     }
 744                     if (conf.verbose) {
 745                         dolog ("Resuming suspended output stream\n");
 746                     }
 747                     continue;
 748
 749                 case -EAGAIN:
 750                     return;
 751
 752                 default:
 753                     alsa_logerr (written, "Failed to write %d frames from %p\n",
 754                                  len, src);
 755                     return;
 756                 }
 757             }
 758
 759             alsa->wpos = (alsa->wpos + written) % hw->samples;
 760             alsa->pending -= written;
 761             len -= written;
 762         }
 763     }
 764 }
 765
 766 static int alsa_run_out (HWVoiceOut *hw, int live)
 767 {
 768     ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
 769     int decr;
 770     snd_pcm_sframes_t avail;
 771
 772     avail = alsa_get_avail (alsa->handle);
 773     if (avail < 0) {
 774         dolog ("Could not get number of available playback frames\n");
 775         return 0;
 776     }
 777
 778     decr = audio_MIN (live, avail);
 779     decr = audio_pcm_hw_clip_out (hw, alsa->pcm_buf, decr, alsa->pending);
 780     alsa->pending += decr;
 781     alsa_write_pending (alsa);
 782     return decr;
 783 }
 784
 785 static void alsa_fini_out (HWVoiceOut *hw)
 786 {
 787     ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
 788
 789     ldebug ("alsa_fini\n");
 790     alsa_anal_close (&alsa->handle, &alsa->pollhlp);
 791
 792     if (alsa->pcm_buf) {
 793         qemu_free (alsa->pcm_buf);
 794         alsa->pcm_buf = NULL;
 795     }
 796 }
 797
 798 static int alsa_init_out (HWVoiceOut *hw, struct audsettings *as)
 799 {
 800     ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
 801     struct alsa_params_req req;
 802     struct alsa_params_obt obt;
 803     snd_pcm_t *handle;
 804     struct audsettings obt_as;
 805
 806     req.fmt = aud_to_alsafmt (as->fmt);
 807     req.freq = as->freq;
 808     req.nchannels = as->nchannels;
 809     req.period_size = conf.period_size_out;
 810     req.buffer_size = conf.buffer_size_out;
 811     req.size_in_usec = conf.size_in_usec_out;
 812     req.override_mask =
 813         (conf.period_size_out_overridden ? 1 : 0) |
 814         (conf.buffer_size_out_overridden ? 2 : 0);
 815
 816     if (alsa_open (0, &req, &obt, &handle)) {
 817         return -1;
 818     }
 819
 820     obt_as.freq = obt.freq;
 821     obt_as.nchannels = obt.nchannels;
 822     obt_as.fmt = obt.fmt;
 823     obt_as.endianness = obt.endianness;
 824
 825     audio_pcm_init_info (&hw->info, &obt_as);
 826     hw->samples = obt.samples;
 827
 828     alsa->pcm_buf = audio_calloc (AUDIO_FUNC, obt.samples, 1 << hw->info.shift);
 829     if (!alsa->pcm_buf) {
 830         dolog ("Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 831                hw->samples, 1 << hw->info.shift);
 832         alsa_anal_close1 (&handle);
 833         return -1;
 834     }
 835
 836     alsa->handle = handle;
 837     return 0;
 838 }
 839
 840 static int alsa_voice_ctl (snd_pcm_t *handle, const char *typ, int pause)
 841 {
 842     int err;
 843
 844     if (pause) {
 845         err = snd_pcm_drop (handle);
 846         if (err < 0) {
 847             alsa_logerr (err, "Could not stop %s\n", typ);
 848             return -1;
 849         }
 850     }
 851     else {
 852         err = snd_pcm_prepare (handle);
 853         if (err < 0) {
 854             alsa_logerr (err, "Could not prepare handle for %s\n", typ);
 855             return -1;
 856         }
 857     }
 858
 859     return 0;
 860 }
 861
 862 static int alsa_ctl_out (HWVoiceOut *hw, int cmd, ...)
 863 {
 864     va_list ap;
 865     int poll_mode;
 866     ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
 867
 868     va_start (ap, cmd);
 869     poll_mode = va_arg (ap, int);
 870     va_end (ap);
 871
 872     switch (cmd) {
 873     case VOICE_ENABLE:
 874         ldebug ("enabling voice\n");
 875         if (poll_mode && alsa_poll_out (hw)) {
 876             poll_mode = 0;
 877         }
 878         hw->poll_mode = poll_mode;
 879         return alsa_voice_ctl (alsa->handle, "playback", 0);
 880
 881     case VOICE_DISABLE:
 882         ldebug ("disabling voice\n");
 883         return alsa_voice_ctl (alsa->handle, "playback", 1);
 884     }
 885
 886     return -1;
 887 }
 888
 889 static int alsa_init_in (HWVoiceIn *hw, struct audsettings *as)
 890 {
 891     ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
 892     struct alsa_params_req req;
 893     struct alsa_params_obt obt;
 894     snd_pcm_t *handle;
 895     struct audsettings obt_as;
 896
 897     req.fmt = aud_to_alsafmt (as->fmt);
 898     req.freq = as->freq;
 899     req.nchannels = as->nchannels;
 900     req.period_size = conf.period_size_in;
 901     req.buffer_size = conf.buffer_size_in;
 902     req.size_in_usec = conf.size_in_usec_in;
 903     req.override_mask =
 904         (conf.period_size_in_overridden ? 1 : 0) |
 905         (conf.buffer_size_in_overridden ? 2 : 0);
 906
 907     if (alsa_open (1, &req, &obt, &handle)) {
 908         return -1;
 909     }
 910
 911     obt_as.freq = obt.freq;
 912     obt_as.nchannels = obt.nchannels;
 913     obt_as.fmt = obt.fmt;
 914     obt_as.endianness = obt.endianness;
 915
 916     audio_pcm_init_info (&hw->info, &obt_as);
 917     hw->samples = obt.samples;
 918
 919     alsa->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 920     if (!alsa->pcm_buf) {
 921         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 922                hw->samples, 1 << hw->info.shift);
 923         alsa_anal_close1 (&handle);
 924         return -1;
 925     }
 926
 927     alsa->handle = handle;
 928     return 0;
 929 }
 930
 931 static void alsa_fini_in (HWVoiceIn *hw)
 932 {
 933     ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
 934
 935     alsa_anal_close (&alsa->handle, &alsa->pollhlp);
 936
 937     if (alsa->pcm_buf) {
 938         qemu_free (alsa->pcm_buf);
 939         alsa->pcm_buf = NULL;
 940     }
 941 }
 942
 943 static int alsa_run_in (HWVoiceIn *hw)
 944 {
 945     ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
 946     int hwshift = hw->info.shift;
 947     int i;
 948     int live = audio_pcm_hw_get_live_in (hw);
 949     int dead = hw->samples - live;
 950     int decr;
 951     struct {
 952         int add;
 953         int len;
 954     } bufs[2] = {
 955         { .add = hw->wpos, .len = 0 },
 956         { .add = 0,        .len = 0 }
 957     };
 958     snd_pcm_sframes_t avail;
 959     snd_pcm_uframes_t read_samples = 0;
 960
 961     if (!dead) {
 962         return 0;
 963     }
 964
 965     avail = alsa_get_avail (alsa->handle);
 966     if (avail < 0) {
 967         dolog ("Could not get number of captured frames\n");
 968         return 0;
 969     }
 970
 971     if (!avail) {
 972         snd_pcm_state_t state;
 973
 974         state = snd_pcm_state (alsa->handle);
 975         switch (state) {
 976         case SND_PCM_STATE_PREPARED:
 977             avail = hw->samples;
 978             break;
 979         case SND_PCM_STATE_SUSPENDED:
 980             /* stream is suspended and waiting for an application recovery */
 981             if (alsa_resume (alsa->handle)) {
 982                 dolog ("Failed to resume suspended input stream\n");
 983                 return 0;
 984             }
 985             if (conf.verbose) {
 986                 dolog ("Resuming suspended input stream\n");
 987             }
 988             break;
 989         default:
 990             if (conf.verbose) {
 991                 dolog ("No frames available and ALSA state is %d\n", state);
 992             }
 993             return 0;
 994         }
 995     }
 996
 997     decr = audio_MIN (dead, avail);
 998     if (!decr) {
 999         return 0;
1000     }
1001
1002     if (hw->wpos + decr > hw->samples) {
1003         bufs[0].len = (hw->samples - hw->wpos);
1004         bufs[1].len = (decr - (hw->samples - hw->wpos));
1005     }
1006     else {
1007         bufs[0].len = decr;
1008     }
1009
1010     for (i = 0; i < 2; ++i) {
1011         void *src;
1012         struct st_sample *dst;
1013         snd_pcm_sframes_t nread;
1014         snd_pcm_uframes_t len;
1015
1016         len = bufs[i].len;
1017
1018         src = advance (alsa->pcm_buf, bufs[i].add << hwshift);
1019         dst = hw->conv_buf + bufs[i].add;
1020
1021         while (len) {
1022             nread = snd_pcm_readi (alsa->handle, src, len);
1023
1024             if (nread <= 0) {
1025                 switch (nread) {
1026                 case 0:
1027                     if (conf.verbose) {
1028                         dolog ("Failed to read %ld frames (read zero)\n", len);
1029                     }
1030                     goto exit;
1031
1032                 case -EPIPE:
1033                     if (alsa_recover (alsa->handle)) {
1034                         alsa_logerr (nread, "Failed to read %ld frames\n", len);
1035                         goto exit;
1036                     }
1037                     if (conf.verbose) {
1038                         dolog ("Recovering from capture xrun\n");
1039                     }
1040                     continue;
1041
1042                 case -EAGAIN:
1043                     goto exit;
1044
1045                 default:
1046                     alsa_logerr (
1047                         nread,
1048                         "Failed to read %ld frames from %p\n",
1049                         len,
1050                         src
1051                         );
1052                     goto exit;
1053                 }
1054             }
1055
1056             hw->conv (dst, src, nread, &nominal_volume);
1057
1058             src = advance (src, nread << hwshift);
1059             dst += nread;
1060
1061             read_samples += nread;
1062             len -= nread;
1063         }
1064     }
1065
1066  exit:
1067     hw->wpos = (hw->wpos + read_samples) % hw->samples;
1068     return read_samples;
1069 }
1070
1071 static int alsa_read (SWVoiceIn *sw, void *buf, int size)
1072 {
1073     return audio_pcm_sw_read (sw, buf, size);
1074 }
1075
1076 static int alsa_ctl_in (HWVoiceIn *hw, int cmd, ...)
1077 {
1078     va_list ap;
1079     int poll_mode;
1080     ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
1081
1082     va_start (ap, cmd);
1083     poll_mode = va_arg (ap, int);
1084     va_end (ap);
1085
1086     switch (cmd) {
1087     case VOICE_ENABLE:
1088         ldebug ("enabling voice\n");
1089         if (poll_mode && alsa_poll_in (hw)) {
1090             poll_mode = 0;
1091         }
1092         hw->poll_mode = poll_mode;
1093
1094         return alsa_voice_ctl (alsa->handle, "capture", 0);
1095
1096     case VOICE_DISABLE:
1097         ldebug ("disabling voice\n");
1098         if (hw->poll_mode) {
1099             hw->poll_mode = 0;
1100             alsa_fini_poll (&alsa->pollhlp);
1101         }
1102         return alsa_voice_ctl (alsa->handle, "capture", 1);
1103     }
1104
1105     return -1;
1106 }
1107
1108 static void *alsa_audio_init (void)
1109 {
1110     return &conf;
1111 }
1112
1113 static void alsa_audio_fini (void *opaque)
1114 {
1115     (void) opaque;
1116 }
1117
1118 static struct audio_option alsa_options[] = {
1119     {
1120         .name        = "DAC_SIZE_IN_USEC",
1121         .tag         = AUD_OPT_BOOL,
1122         .valp        = &conf.size_in_usec_out,
1123         .descr       = "DAC period/buffer size in microseconds (otherwise in frames)"
1124     },
1125     {
1126         .name        = "DAC_PERIOD_SIZE",
1127         .tag         = AUD_OPT_INT,
1128         .valp        = &conf.period_size_out,
1129         .descr       = "DAC period size (0 to go with system default)",
1130         .overriddenp = &conf.period_size_out_overridden
1131     },
1132     {
1133         .name        = "DAC_BUFFER_SIZE",
1134         .tag         = AUD_OPT_INT,
1135         .valp        = &conf.buffer_size_out,
1136         .descr       = "DAC buffer size (0 to go with system default)",
1137         .overriddenp = &conf.buffer_size_out_overridden
1138     },
1139     {
1140         .name        = "ADC_SIZE_IN_USEC",
1141         .tag         = AUD_OPT_BOOL,
1142         .valp        = &conf.size_in_usec_in,
1143         .descr       =
1144         "ADC period/buffer size in microseconds (otherwise in frames)"
1145     },
1146     {
1147         .name        = "ADC_PERIOD_SIZE",
1148         .tag         = AUD_OPT_INT,
1149         .valp        = &conf.period_size_in,
1150         .descr       = "ADC period size (0 to go with system default)",
1151         .overriddenp = &conf.period_size_in_overridden
1152     },
1153     {
1154         .name        = "ADC_BUFFER_SIZE",
1155         .tag         = AUD_OPT_INT,
1156         .valp        = &conf.buffer_size_in,
1157         .descr       = "ADC buffer size (0 to go with system default)",
1158         .overriddenp = &conf.buffer_size_in_overridden
1159     },
1160     {
1161         .name        = "THRESHOLD",
1162         .tag         = AUD_OPT_INT,
1163         .valp        = &conf.threshold,
1164         .descr       = "(undocumented)"
1165     },
1166     {
1167         .name        = "DAC_DEV",
1168         .tag         = AUD_OPT_STR,
1169         .valp        = &conf.pcm_name_out,
1170         .descr       = "DAC device name (for instance dmix)"
1171     },
1172     {
1173         .name        = "ADC_DEV",
1174         .tag         = AUD_OPT_STR,
1175         .valp        = &conf.pcm_name_in,
1176         .descr       = "ADC device name"
1177     },
1178     {
1179         .name        = "VERBOSE",
1180         .tag         = AUD_OPT_BOOL,
1181         .valp        = &conf.verbose,
1182         .descr       = "Behave in a more verbose way"
1183     },
1184     { /* End of list */ }
1185 };
1186
1187 static struct audio_pcm_ops alsa_pcm_ops = {
1188     .init_out = alsa_init_out,
1189     .fini_out = alsa_fini_out,
1190     .run_out  = alsa_run_out,
1191     .write    = alsa_write,
1192     .ctl_out  = alsa_ctl_out,
1193
1194     .init_in  = alsa_init_in,
1195     .fini_in  = alsa_fini_in,
1196     .run_in   = alsa_run_in,
1197     .read     = alsa_read,
1198     .ctl_in   = alsa_ctl_in,
1199 };
1200
1201 struct audio_driver alsa_audio_driver = {
1202     .name           = "alsa",
1203     .descr          = "ALSA http://www.alsa-project.org",
1204     .options        = alsa_options,
1205     .init           = alsa_audio_init,
1206     .fini           = alsa_audio_fini,
1207     .pcm_ops        = &alsa_pcm_ops,
1208     .can_be_default = 1,
1209     .max_voices_out = INT_MAX,
1210     .max_voices_in  = INT_MAX,
1211     .voice_size_out = sizeof (ALSAVoiceOut),
1212     .voice_size_in  = sizeof (ALSAVoiceIn)
1213 };