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",
416 if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
418 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
421 if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
423 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
426 if (set_hwpar (_play_handle, _play_hwpar, "playback", &_play_nchan) < 0) return;
427 if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
432 if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
434 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
437 if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
439 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
442 if (set_hwpar (_capt_handle, _capt_hwpar, "capture", &_capt_nchan) < 0) return;
443 if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
448 if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
450 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
454 if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
456 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
460 if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
462 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
467 snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
468 snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
470 #if __BYTE_ORDER == __LITTLE_ENDIAN
471 switch (_play_format)
473 case SND_PCM_FORMAT_FLOAT_LE:
474 _clear_func = &Alsa_pcmi::clear_32;
475 _play_func = &Alsa_pcmi::play_float;
478 case SND_PCM_FORMAT_S32_LE:
479 _clear_func = &Alsa_pcmi::clear_32;
480 _play_func = &Alsa_pcmi::play_32;
483 case SND_PCM_FORMAT_S32_BE:
484 _clear_func = &Alsa_pcmi::clear_32;
485 _play_func = &Alsa_pcmi::play_32swap;
488 case SND_PCM_FORMAT_S24_3LE:
489 _clear_func = &Alsa_pcmi::clear_24;
490 _play_func = &Alsa_pcmi::play_24;
493 case SND_PCM_FORMAT_S24_3BE:
494 _clear_func = &Alsa_pcmi::clear_24;
495 _play_func = &Alsa_pcmi::play_24swap;
498 case SND_PCM_FORMAT_S16_LE:
499 _clear_func = &Alsa_pcmi::clear_16;
500 _play_func = &Alsa_pcmi::play_16;
503 case SND_PCM_FORMAT_S16_BE:
504 _clear_func = &Alsa_pcmi::clear_16;
505 _play_func = &Alsa_pcmi::play_16swap;
509 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
513 #elif __BYTE_ORDER == __BIG_ENDIAN
514 switch (_play_format)
516 case SND_PCM_FORMAT_S32_LE:
517 _clear_func = &Alsa_pcmi::clear_32;
518 _play_func = &Alsa_pcmi::play_32swap;
521 case SND_PCM_FORMAT_S32_BE:
522 _clear_func = &Alsa_pcmi::clear_32;
523 _play_func = &Alsa_pcmi::play_32;
526 case SND_PCM_FORMAT_S24_3LE:
527 _clear_func = &Alsa_pcmi::clear_24;
528 _play_func = &Alsa_pcmi::play_24swap;
531 case SND_PCM_FORMAT_S24_3BE:
532 _clear_func = &Alsa_pcmi::clear_24;
533 _play_func = &Alsa_pcmi::play_24;
536 case SND_PCM_FORMAT_S16_LE:
537 _clear_func = &Alsa_pcmi::clear_16;
538 _play_func = &Alsa_pcmi::play_16swap;
541 case SND_PCM_FORMAT_S16_BE:
542 _clear_func = &Alsa_pcmi::clear_16;
543 _play_func = &Alsa_pcmi::play_16;
547 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
552 #error "System byte order is undefined or not supported"
555 _play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
560 if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
562 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
566 if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
568 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
572 if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _nfrag) || dir)
574 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
579 if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
581 snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
582 snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
584 #if __BYTE_ORDER == __LITTLE_ENDIAN
585 switch (_capt_format)
587 case SND_PCM_FORMAT_FLOAT_LE:
588 _capt_func = &Alsa_pcmi::capt_float;
591 case SND_PCM_FORMAT_S32_LE:
592 _capt_func = &Alsa_pcmi::capt_32;
595 case SND_PCM_FORMAT_S32_BE:
596 _capt_func = &Alsa_pcmi::capt_32swap;
599 case SND_PCM_FORMAT_S24_3LE:
600 _capt_func = &Alsa_pcmi::capt_24;
603 case SND_PCM_FORMAT_S24_3BE:
604 _capt_func = &Alsa_pcmi::capt_24swap;
607 case SND_PCM_FORMAT_S16_LE:
608 _capt_func = &Alsa_pcmi::capt_16;
611 case SND_PCM_FORMAT_S16_BE:
612 _capt_func = &Alsa_pcmi::capt_16swap;
616 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
620 #elif __BYTE_ORDER == __BIG_ENDIAN
621 switch (_capt_format)
623 case SND_PCM_FORMAT_S32_LE:
624 _capt_func = &Alsa_pcmi::capt_32swap;
627 case SND_PCM_FORMAT_S32_BE:
628 _capt_func = &Alsa_pcmi::capt_32;
631 case SND_PCM_FORMAT_S24_3LE:
632 _capt_func = &Alsa_pcmi::capt_24swap;
635 case SND_PCM_FORMAT_S24_3BE:
636 _capt_func = &Alsa_pcmi::capt_24;
639 case SND_PCM_FORMAT_S16_LE:
640 _capt_func = &Alsa_pcmi::capt_16swap;
643 case SND_PCM_FORMAT_S16_BE:
644 _capt_func = &Alsa_pcmi::capt_16;
648 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
653 #error "System byte order is undefined or not supported"
656 _capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
659 if (_play_npfd + _capt_npfd > MAXPFD)
661 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
669 int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan)
673 if (snd_pcm_hw_params_any (handle, hwpar) < 0)
675 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
679 if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
681 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
685 if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
686 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
687 && (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
689 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
693 if (_debug & FORCE_16B)
695 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
696 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
700 err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
701 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
702 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
703 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
704 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
705 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
706 && (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
710 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
714 if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
716 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
720 snd_pcm_hw_params_get_channels_max (hwpar, nchan);
723 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channnels, reset to 2.\n",
727 if (_debug & FORCE_2CH)
731 if (*nchan > MAXCHAN)
733 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
738 if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
740 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
744 if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
746 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
750 if (snd_pcm_hw_params_set_periods (handle, hwpar, _nfrag, 0) < 0)
752 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
756 if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * _nfrag) < 0)
758 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
759 sname, _fsize * _nfrag);
762 if (snd_pcm_hw_params (handle, hwpar) < 0)
764 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
773 int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
777 snd_pcm_sw_params_current (handle, swpar);
779 if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
781 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
782 sname, SND_PCM_TSTAMP_MMAP);
785 if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
787 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
791 if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
793 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
802 int Alsa_pcmi::recover (void)
805 snd_pcm_status_t *stat;
807 snd_pcm_status_alloca (&stat);
811 if ((err = snd_pcm_status (_play_handle, stat)) < 0)
813 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
816 _play_xrun = xruncheck (stat);
820 if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
822 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
825 _capt_xrun = xruncheck (stat);
828 if (pcm_stop ()) return -1;
829 if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
831 if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
835 if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
837 if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
841 if (pcm_start ()) return -1;
847 float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
849 struct timeval tupd, trig;
852 if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
854 snd_pcm_status_get_tstamp (stat, &tupd);
855 snd_pcm_status_get_trigger_tstamp (stat, &trig);
856 ds = tupd.tv_sec - trig.tv_sec;
857 du = tupd.tv_usec - trig.tv_usec;
863 return ds + 1e-6f * du;
869 char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
873 *((short int *) dst) = 0;
879 char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
891 char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
902 char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
910 if (s > 1) d = 0x7fff;
911 else if (s < -1) d = 0x8001;
912 else d = (short int)((float) 0x7fff * s);
913 *((short int *) dst) = d;
920 char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
928 if (s > 1) d = 0x7fff;
929 else if (s < -1) d = 0x8001;
930 else d = (short int)((float) 0x7fff * s);
939 char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
947 if (s > 1) d = 0x007fffff;
948 else if (s < -1) d = 0x00800001;
949 else d = (int)((float) 0x007fffff * s);
959 char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
967 if (s > 1) d = 0x007fffff;
968 else if (s < -1) d = 0x00800001;
969 else d = (int)((float) 0x007fffff * s);
979 char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
987 if (s > 1) d = 0x007fffff;
988 else if (s < -1) d = 0x00800001;
989 else d = (int)((float) 0x007fffff * s);
990 *((int *) dst) = d << 8;
997 char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
1005 if (s > 1) d = 0x007fffff;
1006 else if (s < -1) d = 0x00800001;
1007 else d = (int)((float) 0x007fffff * s);
1018 char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
1022 *((float *) dst) = *src;
1030 const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
1034 const short int s = *((short int const *) src);
1035 const float d = (float) s / (float) 0x7fff;
1043 const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
1050 s = (src [0] & 0xFF) << 8;
1051 s += (src [1] & 0xFF);
1052 d = (float) s / (float) 0x7fff;
1060 const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
1067 s = (src [0] & 0xFF);
1068 s += (src [1] & 0xFF) << 8;
1069 s += (src [2] & 0xFF) << 16;
1070 if (s & 0x00800000) s-= 0x01000000;
1071 d = (float) s / (float) 0x007fffff;
1079 const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
1086 s = (src [0] & 0xFF) << 16;
1087 s += (src [1] & 0xFF) << 8;
1088 s += (src [2] & 0xFF);
1089 if (s & 0x00800000) s-= 0x01000000;
1090 d = (float) s / (float) 0x007fffff;
1098 const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
1102 const int s = *((int const *) src);
1103 const float d = (float) s / (float) 0x7fffff00;
1111 const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
1118 s = (src [0] & 0xFF) << 24;
1119 s += (src [1] & 0xFF) << 16;
1120 s += (src [2] & 0xFF) << 8;
1121 d = (float) s / (float) 0x7fffff00;
1129 const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
1133 *dst = *((float const *) src);