libao2/ao_alsa.c

   1 /*
   2  * ALSA 0.9.x-1.x audio output driver
   3  *
   4  * Copyright (C) 2004 Alex Beregszaszi
   5  *
   6  * modified for real ALSA 0.9.0 support by Zsolt Barat <joy@streamminister.de>
   7  * additional AC-3 passthrough support by Andy Lo A Foe <andy@alsaplayer.org>
   8  * 08/22/2002 iec958-init rewritten and merged with common init, zsolt
   9  * 04/13/2004 merged with ao_alsa1.x, fixes provided by Jindrich Makovicka
  10  * 04/25/2004 printfs converted to mp_msg, Zsolt.
  11  *
  12  * This file is part of MPlayer.
  13  *
  14  * MPlayer is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * MPlayer is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  26  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  */
  28
  29 #include <errno.h>
  30 #include <sys/time.h>
  31 #include <stdlib.h>
  32 #include <stdarg.h>
  33 #include <ctype.h>
  34 #include <math.h>
  35 #include <string.h>
  36 #include <alloca.h>
  37
  38 #include "config.h"
  39 #include "subopt-helper.h"
  40 #include "mixer.h"
  41 #include "mp_msg.h"
  42 #include "help_mp.h"
  43
  44 #define ALSA_PCM_NEW_HW_PARAMS_API
  45 #define ALSA_PCM_NEW_SW_PARAMS_API
  46
  47 #ifdef HAVE_SYS_ASOUNDLIB_H
  48 #include <sys/asoundlib.h>
  49 #elif defined(HAVE_ALSA_ASOUNDLIB_H)
  50 #include <alsa/asoundlib.h>
  51 #else
  52 #error "asoundlib.h is not in sys/ or alsa/ - please bugreport"
  53 #endif
  54
  55
  56 #include "audio_out.h"
  57 #include "audio_out_internal.h"
  58 #include "libaf/af_format.h"
  59
  60 static const ao_info_t info =
  61 {
  62     "ALSA-0.9.x-1.x audio output",
  63     "alsa",
  64     "Alex Beregszaszi, Zsolt Barat <joy@streamminister.de>",
  65     "under developement"
  66 };
  67
  68 LIBAO_EXTERN(alsa)
  69
  70 static snd_pcm_t *alsa_handler;
  71 static snd_pcm_format_t alsa_format;
  72 static snd_pcm_hw_params_t *alsa_hwparams;
  73 static snd_pcm_sw_params_t *alsa_swparams;
  74
  75 /* 16 sets buffersize to 16 * chunksize is as default 1024
  76  * which seems to be good avarge for most situations
  77  * so buffersize is 16384 frames by default */
  78 static int alsa_fragcount = 16;
  79 static snd_pcm_uframes_t chunk_size = 1024;
  80
  81 static size_t bytes_per_sample;
  82
  83 static int ao_noblock = 0;
  84
  85 static int open_mode;
  86 static int alsa_can_pause = 0;
  87 static snd_pcm_sframes_t prepause_frames;
  88
  89 #define ALSA_DEVICE_SIZE 256
  90
  91 #undef BUFFERTIME
  92 #define SET_CHUNKSIZE
  93
  94 static void alsa_error_handler(const char *file, int line, const char *function,
  95                                int err, const char *format, ...)
  96 {
  97   char tmp[0xc00];
  98   va_list va;
  99
 100   va_start(va, format);
 101   vsnprintf(tmp, sizeof tmp, format, va);
 102   va_end(va);
 103   tmp[sizeof tmp - 1] = '\0';
 104
 105   if (err)
 106     mp_msg(MSGT_AO, MSGL_ERR, "[AO_ALSA] alsa-lib: %s:%i:(%s) %s: %s\n",
 107            file, line, function, tmp, snd_strerror(err));
 108   else
 109     mp_msg(MSGT_AO, MSGL_ERR, "[AO_ALSA] alsa-lib: %s:%i:(%s) %s\n",
 110            file, line, function, tmp);
 111 }
 112
 113 /* to set/get/query special features/parameters */
 114 static int control(int cmd, void *arg)
 115 {
 116   switch(cmd) {
 117   case AOCONTROL_QUERY_FORMAT:
 118     return CONTROL_TRUE;
 119   case AOCONTROL_GET_VOLUME:
 120   case AOCONTROL_SET_VOLUME:
 121     {
 122       ao_control_vol_t *vol = (ao_control_vol_t *)arg;
 123
 124       int err;
 125       snd_mixer_t *handle;
 126       snd_mixer_elem_t *elem;
 127       snd_mixer_selem_id_t *sid;
 128
 129       static char *mix_name = "PCM";
 130       static char *card = "default";
 131       static int mix_index = 0;
 132
 133       long pmin, pmax;
 134       long get_vol, set_vol;
 135       float f_multi;
 136
 137       if(ao_data.format == AF_FORMAT_AC3)
 138         return CONTROL_TRUE;
 139
 140       if(mixer_channel) {
 141          char *test_mix_index;
 142
 143          mix_name = strdup(mixer_channel);
 144          if ((test_mix_index = strchr(mix_name, ','))){
 145                 *test_mix_index = 0;
 146                 test_mix_index++;
 147                 mix_index = strtol(test_mix_index, &test_mix_index, 0);
 148
 149                 if (*test_mix_index){
 150                   mp_tmsg(MSGT_AO,MSGL_ERR,
 151                     "[AO_ALSA] Invalid mixer index. Defaulting to 0.\n");
 152                   mix_index = 0 ;
 153                 }
 154          }
 155       }
 156       if(mixer_device) card = mixer_device;
 157
 158       //allocate simple id
 159       snd_mixer_selem_id_alloca(&sid);
 160
 161       //sets simple-mixer index and name
 162       snd_mixer_selem_id_set_index(sid, mix_index);
 163       snd_mixer_selem_id_set_name(sid, mix_name);
 164
 165       if (mixer_channel) {
 166         free(mix_name);
 167         mix_name = NULL;
 168       }
 169
 170       if ((err = snd_mixer_open(&handle, 0)) < 0) {
 171         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Mixer open error: %s\n", snd_strerror(err));
 172         return CONTROL_ERROR;
 173       }
 174
 175       if ((err = snd_mixer_attach(handle, card)) < 0) {
 176         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Mixer attach %s error: %s\n",
 177                card, snd_strerror(err));
 178         snd_mixer_close(handle);
 179         return CONTROL_ERROR;
 180       }
 181
 182       if ((err = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
 183         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Mixer register error: %s\n", snd_strerror(err));
 184         snd_mixer_close(handle);
 185         return CONTROL_ERROR;
 186       }
 187       err = snd_mixer_load(handle);
 188       if (err < 0) {
 189         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Mixer load error: %s\n", snd_strerror(err));
 190         snd_mixer_close(handle);
 191         return CONTROL_ERROR;
 192       }
 193
 194       elem = snd_mixer_find_selem(handle, sid);
 195       if (!elem) {
 196         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to find simple control '%s',%i.\n",
 197                snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
 198         snd_mixer_close(handle);
 199         return CONTROL_ERROR;
 200         }
 201
 202       snd_mixer_selem_get_playback_volume_range(elem,&pmin,&pmax);
 203       f_multi = (100 / (float)(pmax - pmin));
 204
 205       if (cmd == AOCONTROL_SET_VOLUME) {
 206
 207         set_vol = vol->left / f_multi + pmin + 0.5;
 208
 209         //setting channels
 210         if ((err = snd_mixer_selem_set_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, set_vol)) < 0) {
 211           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Error setting left channel, %s\n",
 212                  snd_strerror(err));
 213           return CONTROL_ERROR;
 214         }
 215         mp_msg(MSGT_AO,MSGL_DBG2,"left=%li, ", set_vol);
 216
 217         set_vol = vol->right / f_multi + pmin + 0.5;
 218
 219         if ((err = snd_mixer_selem_set_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT, set_vol)) < 0) {
 220           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Error setting right channel, %s\n",
 221                  snd_strerror(err));
 222           return CONTROL_ERROR;
 223         }
 224         mp_msg(MSGT_AO,MSGL_DBG2,"right=%li, pmin=%li, pmax=%li, mult=%f\n",
 225                set_vol, pmin, pmax, f_multi);
 226
 227         if (snd_mixer_selem_has_playback_switch(elem)) {
 228           int lmute = (vol->left == 0.0);
 229           int rmute = (vol->right == 0.0);
 230           if (snd_mixer_selem_has_playback_switch_joined(elem)) {
 231             lmute = rmute = lmute && rmute;
 232           } else {
 233             snd_mixer_selem_set_playback_switch(elem, SND_MIXER_SCHN_FRONT_RIGHT, !rmute);
 234           }
 235           snd_mixer_selem_set_playback_switch(elem, SND_MIXER_SCHN_FRONT_LEFT, !lmute);
 236         }
 237       }
 238       else {
 239         snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_LEFT, &get_vol);
 240         vol->left = (get_vol - pmin) * f_multi;
 241         snd_mixer_selem_get_playback_volume(elem, SND_MIXER_SCHN_FRONT_RIGHT, &get_vol);
 242         vol->right = (get_vol - pmin) * f_multi;
 243
 244         mp_msg(MSGT_AO,MSGL_DBG2,"left=%f, right=%f\n",vol->left,vol->right);
 245       }
 246       snd_mixer_close(handle);
 247       return CONTROL_OK;
 248     }
 249
 250   } //end switch
 251   return CONTROL_UNKNOWN;
 252 }
 253
 254 static void parse_device (char *dest, const char *src, int len)
 255 {
 256   char *tmp;
 257   memmove(dest, src, len);
 258   dest[len] = 0;
 259   while ((tmp = strrchr(dest, '.')))
 260     tmp[0] = ',';
 261   while ((tmp = strrchr(dest, '=')))
 262     tmp[0] = ':';
 263 }
 264
 265 static void print_help (void)
 266 {
 267   mp_tmsg (MSGT_AO, MSGL_FATAL,
 268     "\n[AO_ALSA] -ao alsa commandline help:\n"\
 269     "[AO_ALSA] Example: mplayer -ao alsa:device=hw=0.3\n"\
 270     "[AO_ALSA]   Sets first card fourth hardware device.\n\n"\
 271     "[AO_ALSA] Options:\n"\
 272     "[AO_ALSA]   noblock\n"\
 273     "[AO_ALSA]     Opens device in non-blocking mode.\n"\
 274     "[AO_ALSA]   device=<device-name>\n"\
 275     "[AO_ALSA]     Sets device (change , to . and : to =)\n");
 276 }
 277
 278 static int str_maxlen(strarg_t *str) {
 279   if (str->len > ALSA_DEVICE_SIZE)
 280     return 0;
 281   return 1;
 282 }
 283
 284 static int try_open_device(const char *device, int open_mode, int try_ac3)
 285 {
 286   int err, len;
 287   char *ac3_device, *args;
 288
 289   if (try_ac3) {
 290     /* to set the non-audio bit, use AES0=6 */
 291     len = strlen(device);
 292     ac3_device = malloc(len + 7 + 1);
 293     if (!ac3_device)
 294       return -ENOMEM;
 295     strcpy(ac3_device, device);
 296     args = strchr(ac3_device, ':');
 297     if (!args) {
 298       /* no existing parameters: add it behind device name */
 299       strcat(ac3_device, ":AES0=6");
 300     } else {
 301       do
 302         ++args;
 303       while (isspace(*args));
 304       if (*args == '\0') {
 305         /* ":" but no parameters */
 306         strcat(ac3_device, "AES0=6");
 307       } else if (*args != '{') {
 308         /* a simple list of parameters: add it at the end of the list */
 309         strcat(ac3_device, ",AES0=6");
 310       } else {
 311         /* parameters in config syntax: add it inside the { } block */
 312         do
 313           --len;
 314         while (len > 0 && isspace(ac3_device[len]));
 315         if (ac3_device[len] == '}')
 316           strcpy(ac3_device + len, " AES0=6}");
 317       }
 318     }
 319     err = snd_pcm_open(&alsa_handler, ac3_device, SND_PCM_STREAM_PLAYBACK,
 320                        open_mode);
 321     free(ac3_device);
 322   }
 323   if (!try_ac3 || err < 0)
 324     err = snd_pcm_open(&alsa_handler, device, SND_PCM_STREAM_PLAYBACK,
 325                        open_mode);
 326   return err;
 327 }
 328
 329 /*
 330     open & setup audio device
 331     return: 1=success 0=fail
 332 */
 333 static int init(int rate_hz, int channels, int format, int flags)
 334 {
 335     int err;
 336     int block;
 337     strarg_t device;
 338     snd_pcm_uframes_t bufsize;
 339     snd_pcm_uframes_t boundary;
 340     opt_t subopts[] = {
 341       {"block", OPT_ARG_BOOL, &block, NULL},
 342       {"device", OPT_ARG_STR, &device, (opt_test_f)str_maxlen},
 343       {NULL}
 344     };
 345
 346     char alsa_device[ALSA_DEVICE_SIZE + 1];
 347     // make sure alsa_device is null-terminated even when using strncpy etc.
 348     memset(alsa_device, 0, ALSA_DEVICE_SIZE + 1);
 349
 350     mp_msg(MSGT_AO,MSGL_V,"alsa-init: requested format: %d Hz, %d channels, %x\n", rate_hz,
 351         channels, format);
 352     alsa_handler = NULL;
 353 #if SND_LIB_VERSION >= 0x010005
 354     mp_msg(MSGT_AO,MSGL_V,"alsa-init: using ALSA %s\n", snd_asoundlib_version());
 355 #else
 356     mp_msg(MSGT_AO,MSGL_V,"alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR);
 357 #endif
 358
 359     prepause_frames = 0;
 360
 361     snd_lib_error_set_handler(alsa_error_handler);
 362
 363     ao_data.samplerate = rate_hz;
 364     ao_data.format = format;
 365     ao_data.channels = channels;
 366
 367     switch (format)
 368       {
 369       case AF_FORMAT_S8:
 370         alsa_format = SND_PCM_FORMAT_S8;
 371         break;
 372       case AF_FORMAT_U8:
 373         alsa_format = SND_PCM_FORMAT_U8;
 374         break;
 375       case AF_FORMAT_U16_LE:
 376         alsa_format = SND_PCM_FORMAT_U16_LE;
 377         break;
 378       case AF_FORMAT_U16_BE:
 379         alsa_format = SND_PCM_FORMAT_U16_BE;
 380         break;
 381 #ifndef WORDS_BIGENDIAN
 382       case AF_FORMAT_AC3:
 383 #endif
 384       case AF_FORMAT_S16_LE:
 385         alsa_format = SND_PCM_FORMAT_S16_LE;
 386         break;
 387 #ifdef WORDS_BIGENDIAN
 388       case AF_FORMAT_AC3:
 389 #endif
 390       case AF_FORMAT_S16_BE:
 391         alsa_format = SND_PCM_FORMAT_S16_BE;
 392         break;
 393       case AF_FORMAT_U32_LE:
 394         alsa_format = SND_PCM_FORMAT_U32_LE;
 395         break;
 396       case AF_FORMAT_U32_BE:
 397         alsa_format = SND_PCM_FORMAT_U32_BE;
 398         break;
 399       case AF_FORMAT_S32_LE:
 400         alsa_format = SND_PCM_FORMAT_S32_LE;
 401         break;
 402       case AF_FORMAT_S32_BE:
 403         alsa_format = SND_PCM_FORMAT_S32_BE;
 404         break;
 405       case AF_FORMAT_FLOAT_LE:
 406         alsa_format = SND_PCM_FORMAT_FLOAT_LE;
 407         break;
 408       case AF_FORMAT_FLOAT_BE:
 409         alsa_format = SND_PCM_FORMAT_FLOAT_BE;
 410         break;
 411       case AF_FORMAT_MU_LAW:
 412         alsa_format = SND_PCM_FORMAT_MU_LAW;
 413         break;
 414       case AF_FORMAT_A_LAW:
 415         alsa_format = SND_PCM_FORMAT_A_LAW;
 416         break;
 417
 418       default:
 419         alsa_format = SND_PCM_FORMAT_MPEG; //? default should be -1
 420         break;
 421       }
 422
 423     //subdevice parsing
 424     // set defaults
 425     block = 1;
 426     /* switch for spdif
 427      * sets opening sequence for SPDIF
 428      * sets also the playback and other switches 'on the fly'
 429      * while opening the abstract alias for the spdif subdevice
 430      * 'iec958'
 431      */
 432     if (format == AF_FORMAT_AC3) {
 433         device.str = "iec958";
 434         mp_msg(MSGT_AO,MSGL_V,"alsa-spdif-init: playing AC3, %i channels\n", channels);
 435     }
 436   else
 437         /* in any case for multichannel playback we should select
 438          * appropriate device
 439          */
 440         switch (channels) {
 441         case 1:
 442         case 2:
 443           device.str = "default";
 444           mp_msg(MSGT_AO,MSGL_V,"alsa-init: setup for 1/2 channel(s)\n");
 445           break;
 446         case 4:
 447           if (alsa_format == SND_PCM_FORMAT_FLOAT_LE)
 448             // hack - use the converter plugin
 449             device.str = "plug:surround40";
 450           else
 451             device.str = "surround40";
 452           mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround40\n");
 453           break;
 454         case 6:
 455           if (alsa_format == SND_PCM_FORMAT_FLOAT_LE)
 456             device.str = "plug:surround51";
 457           else
 458             device.str = "surround51";
 459           mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround51\n");
 460           break;
 461         default:
 462           device.str = "default";
 463           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] %d channels are not supported.\n",channels);
 464         }
 465     device.len = strlen(device.str);
 466     if (subopt_parse(ao_subdevice, subopts) != 0) {
 467         print_help();
 468         return 0;
 469     }
 470     ao_noblock = !block;
 471     parse_device(alsa_device, device.str, device.len);
 472
 473     mp_msg(MSGT_AO,MSGL_V,"alsa-init: using device %s\n", alsa_device);
 474
 475     //setting modes for block or nonblock-mode
 476     if (ao_noblock) {
 477       open_mode = SND_PCM_NONBLOCK;
 478     }
 479     else {
 480       open_mode = 0;
 481     }
 482
 483     //sets buff/chunksize if its set manually
 484     if (ao_data.buffersize) {
 485       switch (ao_data.buffersize)
 486         {
 487         case 1:
 488           alsa_fragcount = 16;
 489           chunk_size = 512;
 490             mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 8192\n");
 491             mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 512\n");
 492           break;
 493         case 2:
 494           alsa_fragcount = 8;
 495           chunk_size = 1024;
 496             mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 8192\n");
 497             mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 1024\n");
 498           break;
 499         case 3:
 500           alsa_fragcount = 32;
 501           chunk_size = 512;
 502             mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 16384\n");
 503             mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 512\n");
 504           break;
 505         case 4:
 506           alsa_fragcount = 16;
 507           chunk_size = 1024;
 508             mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 16384\n");
 509             mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 1024\n");
 510           break;
 511         default:
 512           alsa_fragcount = 16;
 513           chunk_size = 1024;
 514           break;
 515         }
 516     }
 517
 518     if (!alsa_handler) {
 519       //modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC
 520       if ((err = try_open_device(alsa_device, open_mode, format == AF_FORMAT_AC3)) < 0)
 521         {
 522           if (err != -EBUSY && ao_noblock) {
 523             mp_tmsg(MSGT_AO,MSGL_INFO,"[AO_ALSA] Open in nonblock-mode failed, trying to open in block-mode.\n");
 524             if ((err = try_open_device(alsa_device, 0, format == AF_FORMAT_AC3)) < 0) {
 525               mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Playback open error: %s\n", snd_strerror(err));
 526               return 0;
 527             }
 528           } else {
 529             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Playback open error: %s\n", snd_strerror(err));
 530             return 0;
 531           }
 532         }
 533
 534       if ((err = snd_pcm_nonblock(alsa_handler, 0)) < 0) {
 535          mp_tmsg(MSGT_AO,MSGL_ERR,"[AL_ALSA] Error setting block-mode %s.\n", snd_strerror(err));
 536       } else {
 537         mp_msg(MSGT_AO,MSGL_V,"alsa-init: pcm opened in blocking mode\n");
 538       }
 539
 540       snd_pcm_hw_params_alloca(&alsa_hwparams);
 541       snd_pcm_sw_params_alloca(&alsa_swparams);
 542
 543       // setting hw-parameters
 544       if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
 545         {
 546           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to get initial parameters: %s\n",
 547                  snd_strerror(err));
 548           return 0;
 549         }
 550
 551       err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
 552                                          SND_PCM_ACCESS_RW_INTERLEAVED);
 553       if (err < 0) {
 554         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set access type: %s\n",
 555                snd_strerror(err));
 556         return 0;
 557       }
 558
 559       /* workaround for nonsupported formats
 560          sets default format to S16_LE if the given formats aren't supported */
 561       if ((err = snd_pcm_hw_params_test_format(alsa_handler, alsa_hwparams,
 562                                              alsa_format)) < 0)
 563       {
 564          mp_tmsg(MSGT_AO,MSGL_INFO,
 565                 "[AO_ALSA] Format %s is not supported by hardware, trying default.\n", af_fmt2str_short(format));
 566          alsa_format = SND_PCM_FORMAT_S16_LE;
 567          ao_data.format = AF_FORMAT_S16_LE;
 568       }
 569
 570       if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
 571                                               alsa_format)) < 0)
 572         {
 573           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set format: %s\n",
 574                  snd_strerror(err));
 575           return 0;
 576         }
 577
 578       if ((err = snd_pcm_hw_params_set_channels_near(alsa_handler, alsa_hwparams,
 579                                                      &ao_data.channels)) < 0)
 580         {
 581           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set channels: %s\n",
 582                  snd_strerror(err));
 583           return 0;
 584         }
 585
 586       /* workaround for buggy rate plugin (should be fixed in ALSA 1.0.11)
 587          prefer our own resampler */
 588 #if SND_LIB_VERSION >= 0x010009
 589       if ((err = snd_pcm_hw_params_set_rate_resample(alsa_handler, alsa_hwparams,
 590                                                      0)) < 0)
 591         {
 592           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to disable resampling: %s\n",
 593                  snd_strerror(err));
 594           return 0;
 595         }
 596 #endif
 597
 598       if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams,
 599                                                  &ao_data.samplerate, NULL)) < 0)
 600         {
 601           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set samplerate-2: %s\n",
 602                  snd_strerror(err));
 603           return 0;
 604         }
 605
 606       bytes_per_sample = snd_pcm_format_physical_width(alsa_format) / 8;
 607       bytes_per_sample *= ao_data.channels;
 608       ao_data.bps = ao_data.samplerate * bytes_per_sample;
 609
 610 #ifdef BUFFERTIME
 611       {
 612         int alsa_buffer_time = 500000; /* original 60 */
 613         int alsa_period_time;
 614         alsa_period_time = alsa_buffer_time/4;
 615         if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams,
 616                                                           &alsa_buffer_time, NULL)) < 0)
 617           {
 618             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set buffer time near: %s\n",
 619                    snd_strerror(err));
 620             return 0;
 621           } else
 622             alsa_buffer_time = err;
 623
 624         if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams,
 625                                                           &alsa_period_time, NULL)) < 0)
 626           /* original: alsa_buffer_time/ao_data.bps */
 627           {
 628             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set period time: %s\n",
 629                    snd_strerror(err));
 630             return 0;
 631           }
 632         mp_tmsg(MSGT_AO,MSGL_INFO,"[AO_ALSA] buffer_time: %d, period_time :%d\n",
 633                alsa_buffer_time, err);
 634       }
 635 #endif//end SET_BUFFERTIME
 636
 637 #ifdef SET_CHUNKSIZE
 638       {
 639         //set chunksize
 640         if ((err = snd_pcm_hw_params_set_period_size_near(alsa_handler, alsa_hwparams,
 641                                                           &chunk_size, NULL)) < 0)
 642           {
 643             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO ALSA] Unable to set period size(%ld): %s\n",
 644                             chunk_size, snd_strerror(err));
 645             return 0;
 646           }
 647         else {
 648           mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set to %li\n", chunk_size);
 649         }
 650         if ((err = snd_pcm_hw_params_set_periods_near(alsa_handler, alsa_hwparams,
 651                                                       &alsa_fragcount, NULL)) < 0) {
 652           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set periods: %s\n",
 653                  snd_strerror(err));
 654           return 0;
 655         }
 656         else {
 657           mp_msg(MSGT_AO,MSGL_V,"alsa-init: fragcount=%i\n", alsa_fragcount);
 658         }
 659       }
 660 #endif//end SET_CHUNKSIZE
 661
 662       /* finally install hardware parameters */
 663       if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
 664         {
 665           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set hw-parameters: %s\n",
 666                  snd_strerror(err));
 667           return 0;
 668         }
 669       // end setting hw-params
 670
 671
 672       // gets buffersize for control
 673       if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams, &bufsize)) < 0)
 674         {
 675           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to get buffersize: %s\n", snd_strerror(err));
 676           return 0;
 677         }
 678       else {
 679         ao_data.buffersize = bufsize * bytes_per_sample;
 680           mp_msg(MSGT_AO,MSGL_V,"alsa-init: got buffersize=%i\n", ao_data.buffersize);
 681       }
 682
 683       if ((err = snd_pcm_hw_params_get_period_size(alsa_hwparams, &chunk_size, NULL)) < 0) {
 684         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO ALSA] Unable to get period size: %s\n", snd_strerror(err));
 685         return 0;
 686       } else {
 687         mp_msg(MSGT_AO,MSGL_V,"alsa-init: got period size %li\n", chunk_size);
 688       }
 689       ao_data.outburst = chunk_size * bytes_per_sample;
 690
 691       /* setting software parameters */
 692       if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0) {
 693         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to get sw-parameters: %s\n",
 694                snd_strerror(err));
 695         return 0;
 696       }
 697 #if SND_LIB_VERSION >= 0x000901
 698       if ((err = snd_pcm_sw_params_get_boundary(alsa_swparams, &boundary)) < 0) {
 699         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to get boundary: %s\n",
 700                snd_strerror(err));
 701         return 0;
 702       }
 703 #else
 704       boundary = 0x7fffffff;
 705 #endif
 706       /* start playing when one period has been written */
 707       if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, chunk_size)) < 0) {
 708         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set start threshold: %s\n",
 709                snd_strerror(err));
 710         return 0;
 711       }
 712       /* disable underrun reporting */
 713       if ((err = snd_pcm_sw_params_set_stop_threshold(alsa_handler, alsa_swparams, boundary)) < 0) {
 714         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set stop threshold: %s\n",
 715                snd_strerror(err));
 716         return 0;
 717       }
 718 #if SND_LIB_VERSION >= 0x000901
 719       /* play silence when there is an underrun */
 720       if ((err = snd_pcm_sw_params_set_silence_size(alsa_handler, alsa_swparams, boundary)) < 0) {
 721         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to set silence size: %s\n",
 722                snd_strerror(err));
 723         return 0;
 724       }
 725 #endif
 726       if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) {
 727         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Unable to get sw-parameters: %s\n",
 728                snd_strerror(err));
 729         return 0;
 730       }
 731       /* end setting sw-params */
 732
 733       mp_msg(MSGT_AO,MSGL_V,"alsa: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
 734              ao_data.samplerate, ao_data.channels, (int)bytes_per_sample, ao_data.buffersize,
 735              snd_pcm_format_description(alsa_format));
 736
 737     } // end switch alsa_handler (spdif)
 738     alsa_can_pause = snd_pcm_hw_params_can_pause(alsa_hwparams);
 739     return 1;
 740 } // end init
 741
 742
 743 /* close audio device */
 744 static void uninit(int immed)
 745 {
 746
 747   if (alsa_handler) {
 748     int err;
 749
 750     if (!immed)
 751       snd_pcm_drain(alsa_handler);
 752
 753     if ((err = snd_pcm_close(alsa_handler)) < 0)
 754       {
 755         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm close error: %s\n", snd_strerror(err));
 756         return;
 757       }
 758     else {
 759       alsa_handler = NULL;
 760       mp_msg(MSGT_AO,MSGL_V,"alsa-uninit: pcm closed\n");
 761     }
 762   }
 763   else {
 764     mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] No handler defined!\n");
 765   }
 766 }
 767
 768 static void audio_pause(void)
 769 {
 770     int err;
 771
 772     if (alsa_can_pause) {
 773         if ((err = snd_pcm_pause(alsa_handler, 1)) < 0)
 774         {
 775             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm pause error: %s\n", snd_strerror(err));
 776             return;
 777         }
 778           mp_msg(MSGT_AO,MSGL_V,"alsa-pause: pause supported by hardware\n");
 779     } else {
 780         if (snd_pcm_delay(alsa_handler, &prepause_frames) < 0
 781             || prepause_frames < 0)
 782             prepause_frames = 0;
 783
 784         if ((err = snd_pcm_drop(alsa_handler)) < 0)
 785         {
 786             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm drop error: %s\n", snd_strerror(err));
 787             return;
 788         }
 789     }
 790 }
 791
 792 static void audio_resume(void)
 793 {
 794     int err;
 795
 796     if (snd_pcm_state(alsa_handler) == SND_PCM_STATE_SUSPENDED) {
 797         mp_tmsg(MSGT_AO,MSGL_INFO,"[AO_ALSA] Pcm in suspend mode, trying to resume.\n");
 798         while ((err = snd_pcm_resume(alsa_handler)) == -EAGAIN) sleep(1);
 799     }
 800     if (alsa_can_pause) {
 801         if ((err = snd_pcm_pause(alsa_handler, 0)) < 0)
 802         {
 803             mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm resume error: %s\n", snd_strerror(err));
 804             return;
 805         }
 806           mp_msg(MSGT_AO,MSGL_V,"alsa-resume: resume supported by hardware\n");
 807     } else {
 808         if ((err = snd_pcm_prepare(alsa_handler)) < 0)
 809         {
 810            mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err));
 811             return;
 812         }
 813         if (prepause_frames) {
 814             void *silence = calloc(prepause_frames, bytes_per_sample);
 815             play(silence, prepause_frames * bytes_per_sample, 0);
 816             free(silence);
 817         }
 818     }
 819 }
 820
 821 /* stop playing and empty buffers (for seeking/pause) */
 822 static void reset(void)
 823 {
 824     int err;
 825
 826     prepause_frames = 0;
 827     if ((err = snd_pcm_drop(alsa_handler)) < 0)
 828     {
 829         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err));
 830         return;
 831     }
 832     if ((err = snd_pcm_prepare(alsa_handler)) < 0)
 833     {
 834         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err));
 835         return;
 836     }
 837     return;
 838 }
 839
 840 /*
 841     plays 'len' bytes of 'data'
 842     returns: number of bytes played
 843     modified last at 29.06.02 by jp
 844     thanxs for marius <marius@rospot.com> for giving us the light ;)
 845 */
 846
 847 static int play(void* data, int len, int flags)
 848 {
 849   int num_frames = len / bytes_per_sample;
 850   snd_pcm_sframes_t res = 0;
 851
 852   //mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: frames=%i, len=%i\n",num_frames,len);
 853
 854   if (!alsa_handler) {
 855     mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Device configuration error.");
 856     return 0;
 857   }
 858
 859   if (num_frames == 0)
 860     return 0;
 861
 862   do {
 863     res = snd_pcm_writei(alsa_handler, data, num_frames);
 864
 865       if (res == -EINTR) {
 866         /* nothing to do */
 867         res = 0;
 868       }
 869       else if (res == -ESTRPIPE) {      /* suspend */
 870         mp_tmsg(MSGT_AO,MSGL_INFO,"[AO_ALSA] Pcm in suspend mode, trying to resume.\n");
 871         while ((res = snd_pcm_resume(alsa_handler)) == -EAGAIN)
 872           sleep(1);
 873       }
 874       if (res < 0) {
 875         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Write error: %s\n", snd_strerror(res));
 876         mp_tmsg(MSGT_AO,MSGL_INFO,"[AO_ALSA] Trying to reset soundcard.\n");
 877         if ((res = snd_pcm_prepare(alsa_handler)) < 0) {
 878           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(res));
 879           return 0;
 880           break;
 881         }
 882       }
 883   } while (res == 0);
 884
 885   return res < 0 ? res : res * bytes_per_sample;
 886 }
 887
 888 /* how many byes are free in the buffer */
 889 static int get_space(void)
 890 {
 891     snd_pcm_status_t *status;
 892     int ret;
 893
 894     snd_pcm_status_alloca(&status);
 895
 896     if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
 897     {
 898         mp_tmsg(MSGT_AO,MSGL_ERR,"[AO_ALSA] Cannot get pcm status: %s\n", snd_strerror(ret));
 899         return 0;
 900     }
 901
 902     unsigned space = snd_pcm_status_get_avail(status) * bytes_per_sample;
 903     if (space > ao_data.buffersize) // Buffer underrun?
 904         space = ao_data.buffersize;
 905     return space;
 906 }
 907
 908 /* delay in seconds between first and last sample in buffer */
 909 static float get_delay(void)
 910 {
 911   if (alsa_handler) {
 912     snd_pcm_sframes_t delay;
 913
 914     if (snd_pcm_delay(alsa_handler, &delay) < 0)
 915       return 0;
 916
 917     if (delay < 0) {
 918       /* underrun - move the application pointer forward to catch up */
 919 #if SND_LIB_VERSION >= 0x000901 /* snd_pcm_forward() exists since 0.9.0rc8 */
 920       snd_pcm_forward(alsa_handler, -delay);
 921 #endif
 922       delay = 0;
 923     }
 924     return (float)delay / (float)ao_data.samplerate;
 925   } else {
 926     return 0;
 927   }
 928 }