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;
173 r = poll (_poll_fd, n2, 1000);
176 if (errno == EINTR) return 0;
177 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll(): %s\n.", strerror (errno));
183 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll timed out.\n");
190 snd_pcm_poll_descriptors_revents (_play_handle, _poll_fd, n1, &rev);
193 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on playback pollfd.\n");
198 if (rev & POLLOUT) need_play = false;
202 snd_pcm_poll_descriptors_revents (_capt_handle, _poll_fd + n1, n2 - n1, &rev);
205 if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on capture pollfd.\n");
210 if (rev & POLLIN) need_capt = false;
215 if (_play_handle && (play_av = snd_pcm_avail_update (_play_handle)) < 0)
222 if (_capt_handle && (capt_av = snd_pcm_avail_update (_capt_handle)) < 0)
229 return (capt_av < play_av) ? capt_av : play_av;
233 int Alsa_pcmi::pcm_idle (int len)
236 snd_pcm_uframes_t n, k;
254 for (i = 0; i < _play_nchan; i++) clear_chan (i, k);
263 int Alsa_pcmi::play_init (snd_pcm_uframes_t len)
266 const snd_pcm_channel_area_t *a;
269 if ((err = snd_pcm_mmap_begin (_play_handle, &a, &_play_offs, &len)) < 0)
271 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(play): %s.\n", snd_strerror (err));
274 _play_step = (a->step) >> 3;
275 for (i = 0; i < _play_nchan; i++, a++)
277 _play_ptr [i] = (char *) a->addr + ((a->first + a->step * _play_offs) >> 3);
284 int Alsa_pcmi::capt_init (snd_pcm_uframes_t len)
287 const snd_pcm_channel_area_t *a;
290 if ((err = snd_pcm_mmap_begin (_capt_handle, &a, &_capt_offs, &len)) < 0)
292 if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(capt): %s.\n", snd_strerror (err));
295 _capt_step = (a->step) >> 3;
296 for (i = 0; i < _capt_nchan; i++, a++)
298 _capt_ptr [i] = (char *) a->addr + ((a->first + a->step * _capt_offs) >> 3);
305 void Alsa_pcmi::clear_chan (int chan, int len)
307 _play_ptr [chan] = (this->*Alsa_pcmi::_clear_func)(_play_ptr [chan], len);
311 void Alsa_pcmi::play_chan (int chan, const float *src, int len, int step)
313 _play_ptr [chan] = (this->*Alsa_pcmi::_play_func)(src, _play_ptr [chan], len, step);
317 void Alsa_pcmi::capt_chan (int chan, float *dst, int len, int step)
319 _capt_ptr [chan] = (this->*Alsa_pcmi::_capt_func)(_capt_ptr [chan], dst, len, step);
323 int Alsa_pcmi::play_done (int len)
325 return snd_pcm_mmap_commit (_play_handle, _play_offs, len);
329 int Alsa_pcmi::capt_done (int len)
331 return snd_pcm_mmap_commit (_capt_handle, _capt_offs, len);
335 void Alsa_pcmi::printinfo (void)
337 fprintf (stdout, "playback :");
340 fprintf (stdout, "\n nchan : %d\n", _play_nchan);
341 fprintf (stdout, " fsamp : %d\n", _fsamp);
342 fprintf (stdout, " fsize : %ld\n", _fsize);
343 fprintf (stdout, " nfrag : %d\n", _nfrag);
344 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_play_format));
346 else fprintf (stdout, " not enabled\n");
347 fprintf (stdout, "capture :");
350 fprintf (stdout, "\n nchan : %d\n", _capt_nchan);
351 fprintf (stdout, " fsamp : %d\n", _fsamp);
352 fprintf (stdout, " fsize : %ld\n", _fsize);
353 fprintf (stdout, " nfrag : %d\n", _nfrag);
354 fprintf (stdout, " format : %s\n", snd_pcm_format_name (_capt_format));
355 if (_play_handle) fprintf (stdout, "%s\n", _synced ? "synced" : "not synced");
357 else fprintf (stdout, " not enabled\n");
361 // Private members ---------------------------------------------------------------------
364 void Alsa_pcmi::initialise (const char *play_name, const char *capt_name, const char *ctrl_name)
367 snd_pcm_uframes_t fsize;
371 snd_ctl_card_info_t *card;
375 if (snd_pcm_open (&_play_handle, play_name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
378 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for playback.\n",
385 if (snd_pcm_open (&_capt_handle, capt_name, SND_PCM_STREAM_CAPTURE, 0) < 0)
388 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for capture.\n",
393 if (! _play_handle && ! _capt_handle) return;
397 snd_ctl_card_info_alloca (&card);
399 if ((err = snd_ctl_open (&_ctrl_handle, ctrl_name, 0)) < 0)
401 if (_debug & DEBUG_INIT) fprintf (stderr, "Alse_driver: ctl_open(): %s\n",
405 if ((err = snd_ctl_card_info (_ctrl_handle, card)) < 0)
407 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: ctl_card_info(): %s\n",
415 if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
417 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
420 if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
422 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
425 if (set_hwpar (_play_handle, _play_hwpar, "playback", &_play_nchan) < 0) return;
426 if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
431 if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
433 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
436 if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
438 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
441 if (set_hwpar (_capt_handle, _capt_hwpar, "capture", &_capt_nchan) < 0) return;
442 if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
447 if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
449 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
452 if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
454 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
457 if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
459 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
463 snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
464 snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
466 #if __BYTE_ORDER == __LITTLE_ENDIAN
467 switch (_play_format)
469 case SND_PCM_FORMAT_FLOAT_LE:
470 _clear_func = &Alsa_pcmi::clear_32;
471 _play_func = &Alsa_pcmi::play_float;
474 case SND_PCM_FORMAT_S32_LE:
475 _clear_func = &Alsa_pcmi::clear_32;
476 _play_func = &Alsa_pcmi::play_32;
479 case SND_PCM_FORMAT_S32_BE:
480 _clear_func = &Alsa_pcmi::clear_32;
481 _play_func = &Alsa_pcmi::play_32swap;
484 case SND_PCM_FORMAT_S24_3LE:
485 _clear_func = &Alsa_pcmi::clear_24;
486 _play_func = &Alsa_pcmi::play_24;
489 case SND_PCM_FORMAT_S24_3BE:
490 _clear_func = &Alsa_pcmi::clear_24;
491 _play_func = &Alsa_pcmi::play_24swap;
494 case SND_PCM_FORMAT_S16_LE:
495 _clear_func = &Alsa_pcmi::clear_16;
496 _play_func = &Alsa_pcmi::play_16;
499 case SND_PCM_FORMAT_S16_BE:
500 _clear_func = &Alsa_pcmi::clear_16;
501 _play_func = &Alsa_pcmi::play_16swap;
505 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
508 #elif __BYTE_ORDER == __BIG_ENDIAN
509 switch (_play_format)
511 case SND_PCM_FORMAT_S32_LE:
512 _clear_func = &Alsa_pcmi::clear_32;
513 _play_func = &Alsa_pcmi::play_32swap;
516 case SND_PCM_FORMAT_S32_BE:
517 _clear_func = &Alsa_pcmi::clear_32;
518 _play_func = &Alsa_pcmi::play_32;
521 case SND_PCM_FORMAT_S24_3LE:
522 _clear_func = &Alsa_pcmi::clear_24;
523 _play_func = &Alsa_pcmi::play_24swap;
526 case SND_PCM_FORMAT_S24_3BE:
527 _clear_func = &Alsa_pcmi::clear_24;
528 _play_func = &Alsa_pcmi::play_24;
531 case SND_PCM_FORMAT_S16_LE:
532 _clear_func = &Alsa_pcmi::clear_16;
533 _play_func = &Alsa_pcmi::play_16swap;
536 case SND_PCM_FORMAT_S16_BE:
537 _clear_func = &Alsa_pcmi::clear_16;
538 _play_func = &Alsa_pcmi::play_16;
542 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
546 #error "System byte order is undefined or not supported"
549 _play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
554 if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
556 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
559 if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
561 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
564 if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
566 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
570 if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
572 snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
573 snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
575 #if __BYTE_ORDER == __LITTLE_ENDIAN
576 switch (_capt_format)
578 case SND_PCM_FORMAT_FLOAT_LE:
579 _capt_func = &Alsa_pcmi::capt_float;
582 case SND_PCM_FORMAT_S32_LE:
583 _capt_func = &Alsa_pcmi::capt_32;
586 case SND_PCM_FORMAT_S32_BE:
587 _capt_func = &Alsa_pcmi::capt_32swap;
590 case SND_PCM_FORMAT_S24_3LE:
591 _capt_func = &Alsa_pcmi::capt_24;
594 case SND_PCM_FORMAT_S24_3BE:
595 _capt_func = &Alsa_pcmi::capt_24swap;
598 case SND_PCM_FORMAT_S16_LE:
599 _capt_func = &Alsa_pcmi::capt_16;
602 case SND_PCM_FORMAT_S16_BE:
603 _capt_func = &Alsa_pcmi::capt_16swap;
607 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
610 #elif __BYTE_ORDER == __BIG_ENDIAN
611 switch (_capt_format)
613 case SND_PCM_FORMAT_S32_LE:
614 _capt_func = &Alsa_pcmi::capt_32swap;
617 case SND_PCM_FORMAT_S32_BE:
618 _capt_func = &Alsa_pcmi::capt_32;
621 case SND_PCM_FORMAT_S24_3LE:
622 _capt_func = &Alsa_pcmi::capt_24swap;
625 case SND_PCM_FORMAT_S24_3BE:
626 _capt_func = &Alsa_pcmi::capt_24;
629 case SND_PCM_FORMAT_S16_LE:
630 _capt_func = &Alsa_pcmi::capt_16swap;
633 case SND_PCM_FORMAT_S16_BE:
634 _capt_func = &Alsa_pcmi::capt_16;
638 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
642 #error "System byte order is undefined or not supported"
645 _capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
648 if (_play_npfd + _capt_npfd > MAXPFD)
650 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
658 int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan)
662 if (snd_pcm_hw_params_any (handle, hwpar) < 0)
664 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
668 if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
670 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
674 if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
675 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
676 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
678 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
682 if (_debug & FORCE_16B)
684 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
685 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
689 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
690 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
691 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
692 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
693 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
694 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
695 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
699 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
703 if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
705 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
709 snd_pcm_hw_params_get_channels_max (hwpar, nchan);
712 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channnels, reset to 2.\n",
716 if (_debug & FORCE_2CH)
720 if (*nchan > MAXCHAN)
722 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
727 if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
729 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
733 if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
735 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
739 if (snd_pcm_hw_params_set_periods (handle, hwpar, _nfrag, 0) < 0)
741 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
745 if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * _nfrag) < 0)
747 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
748 sname, _fsize * _nfrag);
751 if (snd_pcm_hw_params (handle, hwpar) < 0)
753 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
762 int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
766 snd_pcm_sw_params_current (handle, swpar);
768 if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
770 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
771 sname, SND_PCM_TSTAMP_MMAP);
774 if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
776 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
780 if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
782 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
791 int Alsa_pcmi::recover (void)
794 snd_pcm_status_t *stat;
796 snd_pcm_status_alloca (&stat);
800 if ((err = snd_pcm_status (_play_handle, stat)) < 0)
802 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
805 _play_xrun = xruncheck (stat);
809 if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
811 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
814 _capt_xrun = xruncheck (stat);
817 if (pcm_stop ()) return -1;
818 if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
820 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
824 if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
826 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
830 if (pcm_start ()) return -1;
836 float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
838 struct timeval tupd, trig;
841 if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
843 snd_pcm_status_get_tstamp (stat, &tupd);
844 snd_pcm_status_get_trigger_tstamp (stat, &trig);
845 ds = tupd.tv_sec - trig.tv_sec;
846 du = tupd.tv_usec - trig.tv_usec;
852 return ds + 1e-6f * du;
858 char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
862 *((short int *) dst) = 0;
868 char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
880 char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
891 char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
899 if (s > 1) d = 0x7fff;
900 else if (s < -1) d = 0x8001;
901 else d = (short int)((float) 0x7fff * s);
902 *((short int *) dst) = d;
909 char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
917 if (s > 1) d = 0x7fff;
918 else if (s < -1) d = 0x8001;
919 else d = (short int)((float) 0x7fff * s);
928 char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
936 if (s > 1) d = 0x007fffff;
937 else if (s < -1) d = 0x00800001;
938 else d = (int)((float) 0x007fffff * s);
948 char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
956 if (s > 1) d = 0x007fffff;
957 else if (s < -1) d = 0x00800001;
958 else d = (int)((float) 0x007fffff * s);
968 char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
976 if (s > 1) d = 0x007fffff;
977 else if (s < -1) d = 0x00800001;
978 else d = (int)((float) 0x007fffff * s);
979 *((int *) dst) = d << 8;
986 char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
994 if (s > 1) d = 0x007fffff;
995 else if (s < -1) d = 0x00800001;
996 else d = (int)((float) 0x007fffff * s);
1007 char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
1011 *((float *) dst) = *src;
1019 const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
1023 const short int s = *((short int const *) src);
1024 const float d = (float) s / (float) 0x7fff;
1032 const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
1039 s = (src [0] & 0xFF) << 8;
1040 s += (src [1] & 0xFF);
1041 d = (float) s / (float) 0x7fff;
1049 const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
1056 s = (src [0] & 0xFF);
1057 s += (src [1] & 0xFF) << 8;
1058 s += (src [2] & 0xFF) << 16;
1059 if (s & 0x00800000) s-= 0x01000000;
1060 d = (float) s / (float) 0x007fffff;
1068 const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
1075 s = (src [0] & 0xFF) << 16;
1076 s += (src [1] & 0xFF) << 8;
1077 s += (src [2] & 0xFF);
1078 if (s & 0x00800000) s-= 0x01000000;
1079 d = (float) s / (float) 0x007fffff;
1087 const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
1091 const int s = *((int const *) src);
1092 const float d = (float) s / (float) 0x7fffff00;
1100 const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
1107 s = (src [0] & 0xFF) << 24;
1108 s += (src [1] & 0xFF) << 16;
1109 s += (src [2] & 0xFF) << 8;
1110 d = (float) s / (float) 0x7fffff00;
1118 const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
1122 *dst = *((float const *) src);