1 // ----------------------------------------------------------------------------
3 // Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; either version 3 of the License, or
8 // (at your option) any later version.
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with this program. If not, see <http://www.gnu.org/licenses/>.
18 // ----------------------------------------------------------------------------
20 #if defined(__NetBSD__)
21 #include <sys/endian.h>
26 #include "zita-alsa-pcmi.h"
29 // Public members ----------------------------------------------------------------------
32 int zita_alsa_pcmi_major_version (void)
34 return ZITA_ALSA_PCMI_MAJOR_VERSION;
38 int zita_alsa_pcmi_minor_version (void)
40 return ZITA_ALSA_PCMI_MINOR_VERSION;
44 Alsa_pcmi::Alsa_pcmi (
45 const char *play_name,
46 const char *capt_name,
47 const char *ctrl_name,
50 unsigned int play_nfrag,
51 unsigned int capt_nfrag,
55 , _play_nfrag (play_nfrag)
56 , _capt_nfrag (capt_nfrag)
76 p = getenv ("ZITA_ALSA_PCMI_DEBUG");
77 if (p && *p) _debug = atoi (p);
78 initialise (play_name, capt_name, ctrl_name);
82 Alsa_pcmi::~Alsa_pcmi (void)
84 if (_play_handle) snd_pcm_close (_play_handle);
85 if (_capt_handle) snd_pcm_close (_capt_handle);
86 if (_ctrl_handle) snd_ctl_close (_ctrl_handle);
88 snd_pcm_sw_params_free (_capt_swpar);
89 snd_pcm_hw_params_free (_capt_hwpar);
90 snd_pcm_sw_params_free (_play_swpar);
91 snd_pcm_hw_params_free (_play_hwpar);
95 int Alsa_pcmi::pcm_start (void)
102 n = snd_pcm_avail_update (_play_handle);
103 if (n != _fsize * _play_nfrag)
105 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: full buffer not available at start.\n");
108 for (i = 0; i < _play_nfrag; i++)
111 for (j = 0; j < _play_nchan; j++) clear_chan (j, _fsize);
114 if ((err = snd_pcm_start (_play_handle)) < 0)
116 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(play): %s.\n", snd_strerror (err));
120 if (_capt_handle && !_synced && ((err = snd_pcm_start (_capt_handle)) < 0))
122 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(capt): %s.\n", snd_strerror (err));
130 int Alsa_pcmi::pcm_stop (void)
134 if (_play_handle && ((err = snd_pcm_drop (_play_handle)) < 0))
136 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(play): %s.\n", snd_strerror (err));
139 if (_capt_handle && !_synced && ((err = snd_pcm_drop (_capt_handle)) < 0))
141 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(capt): %s.\n", snd_strerror (err));
149 snd_pcm_sframes_t Alsa_pcmi::pcm_wait (void)
153 snd_pcm_sframes_t capt_av;
154 snd_pcm_sframes_t play_av;
159 need_capt = _capt_handle ? true : false;
160 need_play = _play_handle ? true : false;
162 while (need_play || need_capt)
167 snd_pcm_poll_descriptors (_play_handle, _poll_fd, _play_npfd);
173 snd_pcm_poll_descriptors (_capt_handle, _poll_fd + n1, _capt_npfd);
176 for (i = 0; i < n2; i++) _poll_fd [i].events |= POLLERR;
181 #if defined(__NetBSD__)
182 r = pollts (_poll_fd, n2, &timeout, NULL);
184 r = ppoll (_poll_fd, n2, &timeout, NULL);
190 if (errno == EINTR) return 0;
191 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll(): %s\n.", strerror (errno));
197 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll timed out.\n");
204 snd_pcm_poll_descriptors_revents (_play_handle, _poll_fd, n1, &rev);
207 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on playback pollfd.\n");
212 if (rev & POLLOUT) need_play = false;
216 snd_pcm_poll_descriptors_revents (_capt_handle, _poll_fd + n1, n2 - n1, &rev);
219 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on capture pollfd.\n");
224 if (rev & POLLIN) need_capt = false;
229 if (_play_handle && (play_av = snd_pcm_avail_update (_play_handle)) < 0)
236 if (_capt_handle && (capt_av = snd_pcm_avail_update (_capt_handle)) < 0)
243 return (capt_av < play_av) ? capt_av : play_av;
247 int Alsa_pcmi::pcm_idle (int len)
250 snd_pcm_uframes_t n, k;
268 for (i = 0; i < _play_nchan; i++) clear_chan (i, k);
277 int Alsa_pcmi::play_init (snd_pcm_uframes_t len)
280 const snd_pcm_channel_area_t *a;
286 if ((err = snd_pcm_mmap_begin (_play_handle, &a, &_play_offs, &len)) < 0)
288 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(play): %s.\n", snd_strerror (err));
291 _play_step = (a->step) >> 3;
292 for (i = 0; i < _play_nchan; i++, a++)
294 _play_ptr [i] = (char *) a->addr + ((a->first + a->step * _play_offs) >> 3);
301 int Alsa_pcmi::capt_init (snd_pcm_uframes_t len)
304 const snd_pcm_channel_area_t *a;
311 if ((err = snd_pcm_mmap_begin (_capt_handle, &a, &_capt_offs, &len)) < 0)
313 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(capt): %s.\n", snd_strerror (err));
316 _capt_step = (a->step) >> 3;
317 for (i = 0; i < _capt_nchan; i++, a++)
319 _capt_ptr [i] = (char *) a->addr + ((a->first + a->step * _capt_offs) >> 3);
326 void Alsa_pcmi::clear_chan (int chan, int len)
328 _play_ptr [chan] = (this->*Alsa_pcmi::_clear_func)(_play_ptr [chan], len);
332 void Alsa_pcmi::play_chan (int chan, const float *src, int len, int step)
334 _play_ptr [chan] = (this->*Alsa_pcmi::_play_func)(src, _play_ptr [chan], len, step);
338 void Alsa_pcmi::capt_chan (int chan, float *dst, int len, int step)
340 _capt_ptr [chan] = (this->*Alsa_pcmi::_capt_func)(_capt_ptr [chan], dst, len, step);
344 int Alsa_pcmi::play_done (int len)
346 if (!_play_handle) return 0;
347 return snd_pcm_mmap_commit (_play_handle, _play_offs, len);
351 int Alsa_pcmi::capt_done (int len)
353 if (!_capt_handle) return 0;
354 return snd_pcm_mmap_commit (_capt_handle, _capt_offs, len);
358 void Alsa_pcmi::printinfo (void)
360 fprintf (stdout, "playback :");
363 fprintf (stdout, "\n nchan : %d\n", _play_nchan);
364 fprintf (stdout, " fsamp : %d\n", _fsamp);
365 fprintf (stdout, " fsize : %ld\n", _fsize);
366 fprintf (stdout, " nfrag : %d\n", _play_nfrag);
367 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_play_format));
369 else fprintf (stdout, " not enabled\n");
370 fprintf (stdout, "capture :");
373 fprintf (stdout, "\n nchan : %d\n", _capt_nchan);
374 fprintf (stdout, " fsamp : %d\n", _fsamp);
375 fprintf (stdout, " fsize : %ld\n", _fsize);
376 fprintf (stdout, " nfrag : %d\n", _capt_nfrag);
377 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_capt_format));
378 if (_play_handle) fprintf (stdout, "%s\n", _synced ? "synced" : "not synced");
380 else fprintf (stdout, " not enabled\n");
384 // Private members ---------------------------------------------------------------------
387 void Alsa_pcmi::initialise (const char *play_name, const char *capt_name, const char *ctrl_name)
390 snd_pcm_uframes_t fsize;
394 snd_ctl_card_info_t *card;
398 if (snd_pcm_open (&_play_handle, play_name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
401 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for playback.\n",
408 if (snd_pcm_open (&_capt_handle, capt_name, SND_PCM_STREAM_CAPTURE, 0) < 0)
411 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for capture.\n",
416 if (! _play_handle && ! _capt_handle) return;
420 snd_ctl_card_info_alloca (&card);
422 if ((err = snd_ctl_open (&_ctrl_handle, ctrl_name, 0)) < 0)
424 if (_debug & DEBUG_INIT) fprintf (stderr, "Alse_driver: ctl_open(): %s\n",
428 if ((err = snd_ctl_card_info (_ctrl_handle, card)) < 0)
430 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: ctl_card_info(): %s\n",
439 if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
441 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
444 if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
446 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
449 if (set_hwpar (_play_handle, _play_hwpar, "playback", _play_nfrag, &_play_nchan) < 0) return;
450 if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
455 if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
457 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
460 if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
462 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
465 if (set_hwpar (_capt_handle, _capt_hwpar, "capture", _capt_nfrag, &_capt_nchan) < 0) return;
466 if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
471 if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
473 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
477 if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
479 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
483 if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _play_nfrag) || dir)
485 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
490 snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
491 snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
493 #if __BYTE_ORDER == __LITTLE_ENDIAN
494 switch (_play_format)
496 case SND_PCM_FORMAT_FLOAT_LE:
497 _clear_func = &Alsa_pcmi::clear_32;
498 _play_func = &Alsa_pcmi::play_float;
501 case SND_PCM_FORMAT_S32_LE:
502 _clear_func = &Alsa_pcmi::clear_32;
503 _play_func = &Alsa_pcmi::play_32;
506 case SND_PCM_FORMAT_S32_BE:
507 _clear_func = &Alsa_pcmi::clear_32;
508 _play_func = &Alsa_pcmi::play_32swap;
511 case SND_PCM_FORMAT_S24_3LE:
512 _clear_func = &Alsa_pcmi::clear_24;
513 _play_func = &Alsa_pcmi::play_24;
516 case SND_PCM_FORMAT_S24_3BE:
517 _clear_func = &Alsa_pcmi::clear_24;
518 _play_func = &Alsa_pcmi::play_24swap;
521 case SND_PCM_FORMAT_S16_LE:
522 _clear_func = &Alsa_pcmi::clear_16;
523 _play_func = &Alsa_pcmi::play_16;
526 case SND_PCM_FORMAT_S16_BE:
527 _clear_func = &Alsa_pcmi::clear_16;
528 _play_func = &Alsa_pcmi::play_16swap;
532 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
536 #elif __BYTE_ORDER == __BIG_ENDIAN
537 switch (_play_format)
539 case SND_PCM_FORMAT_S32_LE:
540 _clear_func = &Alsa_pcmi::clear_32;
541 _play_func = &Alsa_pcmi::play_32swap;
544 case SND_PCM_FORMAT_S32_BE:
545 _clear_func = &Alsa_pcmi::clear_32;
546 _play_func = &Alsa_pcmi::play_32;
549 case SND_PCM_FORMAT_S24_3LE:
550 _clear_func = &Alsa_pcmi::clear_24;
551 _play_func = &Alsa_pcmi::play_24swap;
554 case SND_PCM_FORMAT_S24_3BE:
555 _clear_func = &Alsa_pcmi::clear_24;
556 _play_func = &Alsa_pcmi::play_24;
559 case SND_PCM_FORMAT_S16_LE:
560 _clear_func = &Alsa_pcmi::clear_16;
561 _play_func = &Alsa_pcmi::play_16swap;
564 case SND_PCM_FORMAT_S16_BE:
565 _clear_func = &Alsa_pcmi::clear_16;
566 _play_func = &Alsa_pcmi::play_16;
570 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
575 #error "System byte order is undefined or not supported"
578 _play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
583 if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
585 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
589 if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
591 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
595 if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _capt_nfrag) || dir)
597 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
602 if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
604 snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
605 snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
607 #if __BYTE_ORDER == __LITTLE_ENDIAN
608 switch (_capt_format)
610 case SND_PCM_FORMAT_FLOAT_LE:
611 _capt_func = &Alsa_pcmi::capt_float;
614 case SND_PCM_FORMAT_S32_LE:
615 _capt_func = &Alsa_pcmi::capt_32;
618 case SND_PCM_FORMAT_S32_BE:
619 _capt_func = &Alsa_pcmi::capt_32swap;
622 case SND_PCM_FORMAT_S24_3LE:
623 _capt_func = &Alsa_pcmi::capt_24;
626 case SND_PCM_FORMAT_S24_3BE:
627 _capt_func = &Alsa_pcmi::capt_24swap;
630 case SND_PCM_FORMAT_S16_LE:
631 _capt_func = &Alsa_pcmi::capt_16;
634 case SND_PCM_FORMAT_S16_BE:
635 _capt_func = &Alsa_pcmi::capt_16swap;
639 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
643 #elif __BYTE_ORDER == __BIG_ENDIAN
644 switch (_capt_format)
646 case SND_PCM_FORMAT_S32_LE:
647 _capt_func = &Alsa_pcmi::capt_32swap;
650 case SND_PCM_FORMAT_S32_BE:
651 _capt_func = &Alsa_pcmi::capt_32;
654 case SND_PCM_FORMAT_S24_3LE:
655 _capt_func = &Alsa_pcmi::capt_24swap;
658 case SND_PCM_FORMAT_S24_3BE:
659 _capt_func = &Alsa_pcmi::capt_24;
662 case SND_PCM_FORMAT_S16_LE:
663 _capt_func = &Alsa_pcmi::capt_16swap;
666 case SND_PCM_FORMAT_S16_BE:
667 _capt_func = &Alsa_pcmi::capt_16;
671 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
676 #error "System byte order is undefined or not supported"
679 _capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
682 if (_play_npfd + _capt_npfd > MAXPFD)
684 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
692 int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int nfrag, unsigned int *nchan)
696 if (snd_pcm_hw_params_any (handle, hwpar) < 0)
698 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
702 if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
704 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
708 if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
709 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
710 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
712 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
716 if (_debug & FORCE_16B)
718 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
719 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
723 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
724 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
725 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
726 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
727 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
728 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
729 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
733 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
737 if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
739 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
743 snd_pcm_hw_params_get_channels_max (hwpar, nchan);
746 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channels, reset to 2.\n",
750 if (_debug & FORCE_2CH)
754 if (*nchan > MAXCHAN)
756 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
761 if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
763 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
767 if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
769 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
773 if (snd_pcm_hw_params_set_periods (handle, hwpar, nfrag, 0) < 0)
775 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
779 if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * nfrag) < 0)
781 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
782 sname, _fsize * nfrag);
785 if (snd_pcm_hw_params (handle, hwpar) < 0)
787 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
796 int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
800 snd_pcm_sw_params_current (handle, swpar);
802 if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
804 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
805 sname, SND_PCM_TSTAMP_MMAP);
808 if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
810 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
814 if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
816 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
825 int Alsa_pcmi::recover (void)
828 snd_pcm_status_t *stat;
830 snd_pcm_status_alloca (&stat);
834 if ((err = snd_pcm_status (_play_handle, stat)) < 0)
836 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
839 _play_xrun = xruncheck (stat);
843 if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
845 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
848 _capt_xrun = xruncheck (stat);
851 if (pcm_stop ()) return -1;
852 if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
854 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
858 if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
860 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
864 if (pcm_start ()) return -1;
870 float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
872 struct timeval tupd, trig;
875 if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
877 snd_pcm_status_get_tstamp (stat, &tupd);
878 snd_pcm_status_get_trigger_tstamp (stat, &trig);
879 ds = tupd.tv_sec - trig.tv_sec;
880 du = tupd.tv_usec - trig.tv_usec;
886 return ds + 1e-6f * du;
892 char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
896 *((short int *) dst) = 0;
902 char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
914 char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
925 char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
933 if (s > 1) d = 0x7fff;
934 else if (s < -1) d = 0x8001;
935 else d = (short int)((float) 0x7fff * s);
936 *((short int *) dst) = d;
943 char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
951 if (s > 1) d = 0x7fff;
952 else if (s < -1) d = 0x8001;
953 else d = (short int)((float) 0x7fff * s);
962 char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
970 if (s > 1) d = 0x007fffff;
971 else if (s < -1) d = 0x00800001;
972 else d = (int)((float) 0x007fffff * s);
982 char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
990 if (s > 1) d = 0x007fffff;
991 else if (s < -1) d = 0x00800001;
992 else d = (int)((float) 0x007fffff * s);
1002 char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
1010 if (s > 1) d = 0x007fffff;
1011 else if (s < -1) d = 0x00800001;
1012 else d = (int)((float) 0x007fffff * s);
1013 *((int *) dst) = d << 8;
1020 char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
1028 if (s > 1) d = 0x007fffff;
1029 else if (s < -1) d = 0x00800001;
1030 else d = (int)((float) 0x007fffff * s);
1041 char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
1045 *((float *) dst) = *src;
1053 const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
1057 const short int s = *((short int const *) src);
1058 const float d = (float) s / (float) 0x7fff;
1066 const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
1073 s = (src [0] & 0xFF) << 8;
1074 s += (src [1] & 0xFF);
1075 d = (float) s / (float) 0x7fff;
1083 const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
1090 s = (src [0] & 0xFF);
1091 s += (src [1] & 0xFF) << 8;
1092 s += (src [2] & 0xFF) << 16;
1093 if (s & 0x00800000) s-= 0x01000000;
1094 d = (float) s / (float) 0x007fffff;
1102 const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
1109 s = (src [0] & 0xFF) << 16;
1110 s += (src [1] & 0xFF) << 8;
1111 s += (src [2] & 0xFF);
1112 if (s & 0x00800000) s-= 0x01000000;
1113 d = (float) s / (float) 0x007fffff;
1121 const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
1125 const int s = *((int const *) src);
1126 const float d = (float) s / (float) 0x7fffff00;
1134 const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
1141 s = (src [0] & 0xFF) << 24;
1142 s += (src [1] & 0xFF) << 16;
1143 s += (src [2] & 0xFF) << 8;
1144 d = (float) s / (float) 0x7fffff00;
1152 const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
1156 *dst = *((float const *) src);