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 // ----------------------------------------------------------------------------
23 #include "zita-alsa-pcmi.h"
26 // Public members ----------------------------------------------------------------------
29 int zita_alsa_pcmi_major_version (void)
31 return ZITA_ALSA_PCMI_MAJOR_VERSION;
35 int zita_alsa_pcmi_minor_version (void)
37 return ZITA_ALSA_PCMI_MINOR_VERSION;
41 Alsa_pcmi::Alsa_pcmi (
42 const char *play_name,
43 const char *capt_name,
44 const char *ctrl_name,
71 p = getenv ("ZITA_ALSA_PCMI_DEBUG");
72 if (p && *p) _debug = atoi (p);
73 initialise (play_name, capt_name, ctrl_name);
77 Alsa_pcmi::~Alsa_pcmi (void)
79 if (_play_handle) snd_pcm_close (_play_handle);
80 if (_capt_handle) snd_pcm_close (_capt_handle);
81 if (_ctrl_handle) snd_ctl_close (_ctrl_handle);
83 snd_pcm_sw_params_free (_capt_swpar);
84 snd_pcm_hw_params_free (_capt_hwpar);
85 snd_pcm_sw_params_free (_play_swpar);
86 snd_pcm_hw_params_free (_play_hwpar);
90 int Alsa_pcmi::pcm_start (void)
97 n = snd_pcm_avail_update (_play_handle);
98 if (n != _fsize * _nfrag)
100 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: full buffer not available at start.\n");
103 for (i = 0; i < _nfrag; i++)
106 for (j = 0; j < _play_nchan; j++) clear_chan (j, _fsize);
109 if ((err = snd_pcm_start (_play_handle)) < 0)
111 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(play): %s.\n", snd_strerror (err));
115 if (_capt_handle && !_synced && ((err = snd_pcm_start (_capt_handle)) < 0))
117 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(capt): %s.\n", snd_strerror (err));
125 int Alsa_pcmi::pcm_stop (void)
129 if (_play_handle && ((err = snd_pcm_drop (_play_handle)) < 0))
131 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(play): %s.\n", snd_strerror (err));
134 if (_capt_handle && !_synced && ((err = snd_pcm_drop (_capt_handle)) < 0))
136 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(capt): %s.\n", snd_strerror (err));
144 snd_pcm_sframes_t Alsa_pcmi::pcm_wait (void)
148 snd_pcm_sframes_t capt_av;
149 snd_pcm_sframes_t play_av;
154 need_capt = _capt_handle ? true : false;
155 need_play = _play_handle ? true : false;
157 while (need_play || need_capt)
162 snd_pcm_poll_descriptors (_play_handle, _poll_fd, _play_npfd);
168 snd_pcm_poll_descriptors (_capt_handle, _poll_fd + n1, _capt_npfd);
171 for (i = 0; i < n2; i++) _poll_fd [i].events |= POLLERR;
176 r = ppoll (_poll_fd, n2, &timeout, NULL);
180 if (errno == EINTR) return 0;
181 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll(): %s\n.", strerror (errno));
187 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll timed out.\n");
194 snd_pcm_poll_descriptors_revents (_play_handle, _poll_fd, n1, &rev);
197 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on playback pollfd.\n");
202 if (rev & POLLOUT) need_play = false;
206 snd_pcm_poll_descriptors_revents (_capt_handle, _poll_fd + n1, n2 - n1, &rev);
209 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on capture pollfd.\n");
214 if (rev & POLLIN) need_capt = false;
219 if (_play_handle && (play_av = snd_pcm_avail_update (_play_handle)) < 0)
226 if (_capt_handle && (capt_av = snd_pcm_avail_update (_capt_handle)) < 0)
233 return (capt_av < play_av) ? capt_av : play_av;
237 int Alsa_pcmi::pcm_idle (int len)
240 snd_pcm_uframes_t n, k;
258 for (i = 0; i < _play_nchan; i++) clear_chan (i, k);
267 int Alsa_pcmi::play_init (snd_pcm_uframes_t len)
270 const snd_pcm_channel_area_t *a;
276 if ((err = snd_pcm_mmap_begin (_play_handle, &a, &_play_offs, &len)) < 0)
278 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(play): %s.\n", snd_strerror (err));
281 _play_step = (a->step) >> 3;
282 for (i = 0; i < _play_nchan; i++, a++)
284 _play_ptr [i] = (char *) a->addr + ((a->first + a->step * _play_offs) >> 3);
291 int Alsa_pcmi::capt_init (snd_pcm_uframes_t len)
294 const snd_pcm_channel_area_t *a;
301 if ((err = snd_pcm_mmap_begin (_capt_handle, &a, &_capt_offs, &len)) < 0)
303 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(capt): %s.\n", snd_strerror (err));
306 _capt_step = (a->step) >> 3;
307 for (i = 0; i < _capt_nchan; i++, a++)
309 _capt_ptr [i] = (char *) a->addr + ((a->first + a->step * _capt_offs) >> 3);
316 void Alsa_pcmi::clear_chan (int chan, int len)
318 _play_ptr [chan] = (this->*Alsa_pcmi::_clear_func)(_play_ptr [chan], len);
322 void Alsa_pcmi::play_chan (int chan, const float *src, int len, int step)
324 _play_ptr [chan] = (this->*Alsa_pcmi::_play_func)(src, _play_ptr [chan], len, step);
328 void Alsa_pcmi::capt_chan (int chan, float *dst, int len, int step)
330 _capt_ptr [chan] = (this->*Alsa_pcmi::_capt_func)(_capt_ptr [chan], dst, len, step);
334 int Alsa_pcmi::play_done (int len)
336 if (!_play_handle) return 0;
337 return snd_pcm_mmap_commit (_play_handle, _play_offs, len);
341 int Alsa_pcmi::capt_done (int len)
343 if (!_capt_handle) return 0;
344 return snd_pcm_mmap_commit (_capt_handle, _capt_offs, len);
348 void Alsa_pcmi::printinfo (void)
350 fprintf (stdout, "playback :");
353 fprintf (stdout, "\n nchan : %d\n", _play_nchan);
354 fprintf (stdout, " fsamp : %d\n", _fsamp);
355 fprintf (stdout, " fsize : %ld\n", _fsize);
356 fprintf (stdout, " nfrag : %d\n", _nfrag);
357 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_play_format));
359 else fprintf (stdout, " not enabled\n");
360 fprintf (stdout, "capture :");
363 fprintf (stdout, "\n nchan : %d\n", _capt_nchan);
364 fprintf (stdout, " fsamp : %d\n", _fsamp);
365 fprintf (stdout, " fsize : %ld\n", _fsize);
366 fprintf (stdout, " nfrag : %d\n", _nfrag);
367 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_capt_format));
368 if (_play_handle) fprintf (stdout, "%s\n", _synced ? "synced" : "not synced");
370 else fprintf (stdout, " not enabled\n");
374 // Private members ---------------------------------------------------------------------
377 void Alsa_pcmi::initialise (const char *play_name, const char *capt_name, const char *ctrl_name)
380 snd_pcm_uframes_t fsize;
384 snd_ctl_card_info_t *card;
388 if (snd_pcm_open (&_play_handle, play_name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
391 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for playback.\n",
398 if (snd_pcm_open (&_capt_handle, capt_name, SND_PCM_STREAM_CAPTURE, 0) < 0)
401 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for capture.\n",
406 if (! _play_handle && ! _capt_handle) return;
410 snd_ctl_card_info_alloca (&card);
412 if ((err = snd_ctl_open (&_ctrl_handle, ctrl_name, 0)) < 0)
414 if (_debug & DEBUG_INIT) fprintf (stderr, "Alse_driver: ctl_open(): %s\n",
418 if ((err = snd_ctl_card_info (_ctrl_handle, card)) < 0)
420 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: ctl_card_info(): %s\n",
429 if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
431 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
434 if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
436 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
439 if (set_hwpar (_play_handle, _play_hwpar, "playback", &_play_nchan) < 0) return;
440 if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
445 if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
447 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
450 if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
452 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
455 if (set_hwpar (_capt_handle, _capt_hwpar, "capture", &_capt_nchan) < 0) return;
456 if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
461 if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
463 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
467 if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
469 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
473 if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
475 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
480 snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
481 snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
483 #if __BYTE_ORDER == __LITTLE_ENDIAN
484 switch (_play_format)
486 case SND_PCM_FORMAT_FLOAT_LE:
487 _clear_func = &Alsa_pcmi::clear_32;
488 _play_func = &Alsa_pcmi::play_float;
491 case SND_PCM_FORMAT_S32_LE:
492 _clear_func = &Alsa_pcmi::clear_32;
493 _play_func = &Alsa_pcmi::play_32;
496 case SND_PCM_FORMAT_S32_BE:
497 _clear_func = &Alsa_pcmi::clear_32;
498 _play_func = &Alsa_pcmi::play_32swap;
501 case SND_PCM_FORMAT_S24_3LE:
502 _clear_func = &Alsa_pcmi::clear_24;
503 _play_func = &Alsa_pcmi::play_24;
506 case SND_PCM_FORMAT_S24_3BE:
507 _clear_func = &Alsa_pcmi::clear_24;
508 _play_func = &Alsa_pcmi::play_24swap;
511 case SND_PCM_FORMAT_S16_LE:
512 _clear_func = &Alsa_pcmi::clear_16;
513 _play_func = &Alsa_pcmi::play_16;
516 case SND_PCM_FORMAT_S16_BE:
517 _clear_func = &Alsa_pcmi::clear_16;
518 _play_func = &Alsa_pcmi::play_16swap;
522 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
526 #elif __BYTE_ORDER == __BIG_ENDIAN
527 switch (_play_format)
529 case SND_PCM_FORMAT_S32_LE:
530 _clear_func = &Alsa_pcmi::clear_32;
531 _play_func = &Alsa_pcmi::play_32swap;
534 case SND_PCM_FORMAT_S32_BE:
535 _clear_func = &Alsa_pcmi::clear_32;
536 _play_func = &Alsa_pcmi::play_32;
539 case SND_PCM_FORMAT_S24_3LE:
540 _clear_func = &Alsa_pcmi::clear_24;
541 _play_func = &Alsa_pcmi::play_24swap;
544 case SND_PCM_FORMAT_S24_3BE:
545 _clear_func = &Alsa_pcmi::clear_24;
546 _play_func = &Alsa_pcmi::play_24;
549 case SND_PCM_FORMAT_S16_LE:
550 _clear_func = &Alsa_pcmi::clear_16;
551 _play_func = &Alsa_pcmi::play_16swap;
554 case SND_PCM_FORMAT_S16_BE:
555 _clear_func = &Alsa_pcmi::clear_16;
556 _play_func = &Alsa_pcmi::play_16;
560 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
565 #error "System byte order is undefined or not supported"
568 _play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
573 if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
575 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
579 if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
581 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
585 if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
587 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
592 if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
594 snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
595 snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
597 #if __BYTE_ORDER == __LITTLE_ENDIAN
598 switch (_capt_format)
600 case SND_PCM_FORMAT_FLOAT_LE:
601 _capt_func = &Alsa_pcmi::capt_float;
604 case SND_PCM_FORMAT_S32_LE:
605 _capt_func = &Alsa_pcmi::capt_32;
608 case SND_PCM_FORMAT_S32_BE:
609 _capt_func = &Alsa_pcmi::capt_32swap;
612 case SND_PCM_FORMAT_S24_3LE:
613 _capt_func = &Alsa_pcmi::capt_24;
616 case SND_PCM_FORMAT_S24_3BE:
617 _capt_func = &Alsa_pcmi::capt_24swap;
620 case SND_PCM_FORMAT_S16_LE:
621 _capt_func = &Alsa_pcmi::capt_16;
624 case SND_PCM_FORMAT_S16_BE:
625 _capt_func = &Alsa_pcmi::capt_16swap;
629 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
633 #elif __BYTE_ORDER == __BIG_ENDIAN
634 switch (_capt_format)
636 case SND_PCM_FORMAT_S32_LE:
637 _capt_func = &Alsa_pcmi::capt_32swap;
640 case SND_PCM_FORMAT_S32_BE:
641 _capt_func = &Alsa_pcmi::capt_32;
644 case SND_PCM_FORMAT_S24_3LE:
645 _capt_func = &Alsa_pcmi::capt_24swap;
648 case SND_PCM_FORMAT_S24_3BE:
649 _capt_func = &Alsa_pcmi::capt_24;
652 case SND_PCM_FORMAT_S16_LE:
653 _capt_func = &Alsa_pcmi::capt_16swap;
656 case SND_PCM_FORMAT_S16_BE:
657 _capt_func = &Alsa_pcmi::capt_16;
661 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
666 #error "System byte order is undefined or not supported"
669 _capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
672 if (_play_npfd + _capt_npfd > MAXPFD)
674 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
682 int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan)
686 if (snd_pcm_hw_params_any (handle, hwpar) < 0)
688 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
692 if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
694 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
698 if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
699 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
700 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
702 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
706 if (_debug & FORCE_16B)
708 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
709 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
713 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
714 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
715 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
716 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
717 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
718 && (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 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
727 if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
729 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
733 snd_pcm_hw_params_get_channels_max (hwpar, nchan);
736 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channnels, reset to 2.\n",
740 if (_debug & FORCE_2CH)
744 if (*nchan > MAXCHAN)
746 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
751 if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
753 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
757 if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
759 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
763 if (snd_pcm_hw_params_set_periods (handle, hwpar, _nfrag, 0) < 0)
765 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
769 if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * _nfrag) < 0)
771 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
772 sname, _fsize * _nfrag);
775 if (snd_pcm_hw_params (handle, hwpar) < 0)
777 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
786 int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
790 snd_pcm_sw_params_current (handle, swpar);
792 if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
794 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
795 sname, SND_PCM_TSTAMP_MMAP);
798 if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
800 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
804 if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
806 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
815 int Alsa_pcmi::recover (void)
818 snd_pcm_status_t *stat;
820 snd_pcm_status_alloca (&stat);
824 if ((err = snd_pcm_status (_play_handle, stat)) < 0)
826 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
829 _play_xrun = xruncheck (stat);
833 if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
835 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
838 _capt_xrun = xruncheck (stat);
841 if (pcm_stop ()) return -1;
842 if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
844 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
848 if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
850 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
854 if (pcm_start ()) return -1;
860 float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
862 struct timeval tupd, trig;
865 if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
867 snd_pcm_status_get_tstamp (stat, &tupd);
868 snd_pcm_status_get_trigger_tstamp (stat, &trig);
869 ds = tupd.tv_sec - trig.tv_sec;
870 du = tupd.tv_usec - trig.tv_usec;
876 return ds + 1e-6f * du;
882 char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
886 *((short int *) dst) = 0;
892 char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
904 char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
915 char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
923 if (s > 1) d = 0x7fff;
924 else if (s < -1) d = 0x8001;
925 else d = (short int)((float) 0x7fff * s);
926 *((short int *) dst) = d;
933 char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
941 if (s > 1) d = 0x7fff;
942 else if (s < -1) d = 0x8001;
943 else d = (short int)((float) 0x7fff * s);
952 char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
960 if (s > 1) d = 0x007fffff;
961 else if (s < -1) d = 0x00800001;
962 else d = (int)((float) 0x007fffff * s);
972 char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
980 if (s > 1) d = 0x007fffff;
981 else if (s < -1) d = 0x00800001;
982 else d = (int)((float) 0x007fffff * s);
992 char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
1000 if (s > 1) d = 0x007fffff;
1001 else if (s < -1) d = 0x00800001;
1002 else d = (int)((float) 0x007fffff * s);
1003 *((int *) dst) = d << 8;
1010 char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
1018 if (s > 1) d = 0x007fffff;
1019 else if (s < -1) d = 0x00800001;
1020 else d = (int)((float) 0x007fffff * s);
1031 char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
1035 *((float *) dst) = *src;
1043 const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
1047 const short int s = *((short int const *) src);
1048 const float d = (float) s / (float) 0x7fff;
1056 const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
1063 s = (src [0] & 0xFF) << 8;
1064 s += (src [1] & 0xFF);
1065 d = (float) s / (float) 0x7fff;
1073 const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
1080 s = (src [0] & 0xFF);
1081 s += (src [1] & 0xFF) << 8;
1082 s += (src [2] & 0xFF) << 16;
1083 if (s & 0x00800000) s-= 0x01000000;
1084 d = (float) s / (float) 0x007fffff;
1092 const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
1099 s = (src [0] & 0xFF) << 16;
1100 s += (src [1] & 0xFF) << 8;
1101 s += (src [2] & 0xFF);
1102 if (s & 0x00800000) s-= 0x01000000;
1103 d = (float) s / (float) 0x007fffff;
1111 const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
1115 const int s = *((int const *) src);
1116 const float d = (float) s / (float) 0x7fffff00;
1124 const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
1131 s = (src [0] & 0xFF) << 24;
1132 s += (src [1] & 0xFF) << 16;
1133 s += (src [2] & 0xFF) << 8;
1134 d = (float) s / (float) 0x7fffff00;
1142 const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
1146 *dst = *((float const *) src);