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livetrax/libs/backends/alsa/zita-alsa-pcmi.cc

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// ----------------------------------------------------------------------------
//
// Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
#if defined(__NetBSD__)
#include <sys/endian.h>
#else
#include <endian.h>
#endif
#include <sys/time.h>
#include "zita-alsa-pcmi.h"
// Public members ----------------------------------------------------------------------
int zita_alsa_pcmi_major_version (void)
{
return ZITA_ALSA_PCMI_MAJOR_VERSION;
}
int zita_alsa_pcmi_minor_version (void)
{
return ZITA_ALSA_PCMI_MINOR_VERSION;
}
Alsa_pcmi::Alsa_pcmi (
const char *play_name,
const char *capt_name,
const char *ctrl_name,
unsigned int fsamp,
unsigned int fsize,
unsigned int play_nfrag,
unsigned int capt_nfrag,
unsigned int debug)
: _fsamp (fsamp)
, _fsize (fsize)
, _play_nfrag (play_nfrag)
, _capt_nfrag (capt_nfrag)
, _debug (debug)
, _state (-1)
, _play_handle (0)
, _capt_handle (0)
, _ctrl_handle (0)
, _play_hwpar (0)
, _play_swpar (0)
, _capt_hwpar (0)
, _capt_swpar (0)
, _play_nchan (0)
, _capt_nchan (0)
, _play_xrun (0)
, _capt_xrun (0)
, _synced (false)
, _play_npfd (0)
, _capt_npfd (0)
{
const char *p;
p = getenv ("ZITA_ALSA_PCMI_DEBUG");
if (p && *p) _debug = atoi (p);
initialise (play_name, capt_name, ctrl_name);
}
Alsa_pcmi::~Alsa_pcmi (void)
{
if (_play_handle) snd_pcm_close (_play_handle);
if (_capt_handle) snd_pcm_close (_capt_handle);
if (_ctrl_handle) snd_ctl_close (_ctrl_handle);
snd_pcm_sw_params_free (_capt_swpar);
snd_pcm_hw_params_free (_capt_hwpar);
snd_pcm_sw_params_free (_play_swpar);
snd_pcm_hw_params_free (_play_hwpar);
}
int Alsa_pcmi::pcm_start (void)
{
unsigned int i, j, n;
int err;
if (_play_handle)
{
n = snd_pcm_avail_update (_play_handle);
if (n != _fsize * _play_nfrag)
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: full buffer not available at start.\n");
return -1;
}
for (i = 0; i < _play_nfrag; i++)
{
play_init (_fsize);
for (j = 0; j < _play_nchan; j++) clear_chan (j, _fsize);
play_done (_fsize);
}
if ((err = snd_pcm_start (_play_handle)) < 0)
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(play): %s.\n", snd_strerror (err));
return -1;
}
}
if (_capt_handle && !_synced && ((err = snd_pcm_start (_capt_handle)) < 0))
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_start(capt): %s.\n", snd_strerror (err));
return -1;
}
return 0;
}
int Alsa_pcmi::pcm_stop (void)
{
int err;
if (_play_handle && ((err = snd_pcm_drop (_play_handle)) < 0))
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(play): %s.\n", snd_strerror (err));
return -1;
}
if (_capt_handle && !_synced && ((err = snd_pcm_drop (_capt_handle)) < 0))
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_drop(capt): %s.\n", snd_strerror (err));
return -1;
}
return 0;
}
snd_pcm_sframes_t Alsa_pcmi::pcm_wait (void)
{
bool need_capt;
bool need_play;
snd_pcm_sframes_t capt_av;
snd_pcm_sframes_t play_av;
unsigned short rev;
int i, r, n1, n2;
_state = 0;
need_capt = _capt_handle ? true : false;
need_play = _play_handle ? true : false;
while (need_play || need_capt)
{
n1 = 0;
if (need_play)
{
snd_pcm_poll_descriptors (_play_handle, _poll_fd, _play_npfd);
n1 += _play_npfd;
}
n2 = n1;
if (need_capt)
{
snd_pcm_poll_descriptors (_capt_handle, _poll_fd + n1, _capt_npfd);
n2 += _capt_npfd;
}
for (i = 0; i < n2; i++) _poll_fd [i].events |= POLLERR;
timespec timeout;
timeout.tv_sec = 1;
timeout.tv_nsec = 0;
#if defined(__NetBSD__)
r = pollts (_poll_fd, n2, &timeout, NULL);
#else
r = ppoll (_poll_fd, n2, &timeout, NULL);
#endif
if (r < 0)
{
if (errno == EINTR) return 0;
if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll(): %s\n.", strerror (errno));
_state = -1;
return 0;
}
if (r == 0)
{
if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: poll timed out.\n");
_state = -1;
return 0;
}
if (need_play)
{
snd_pcm_poll_descriptors_revents (_play_handle, _poll_fd, n1, &rev);
if (rev & POLLERR)
{
if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on playback pollfd.\n");
_state = 1;
recover ();
return 0;
}
if (rev & POLLOUT) need_play = false;
}
if (need_capt)
{
snd_pcm_poll_descriptors_revents (_capt_handle, _poll_fd + n1, n2 - n1, &rev);
if (rev & POLLERR)
{
if (_debug & DEBUG_WAIT) fprintf (stderr, "Alsa_pcmi: error on capture pollfd.\n");
_state = 1;
recover ();
return 0;
}
if (rev & POLLIN) need_capt = false;
}
}
play_av = 999999999;
if (_play_handle && (play_av = snd_pcm_avail_update (_play_handle)) < 0)
{
_state = -1;
recover ();
return 0;
}
capt_av = 999999999;
if (_capt_handle && (capt_av = snd_pcm_avail_update (_capt_handle)) < 0)
{
_state = -1;
recover ();
return 0;
}
return (capt_av < play_av) ? capt_av : play_av;
}
int Alsa_pcmi::pcm_idle (int len)
{
unsigned int i;
snd_pcm_uframes_t n, k;
if (_capt_handle)
{
n = len;
while (n)
{
k = capt_init (n);
capt_done (k);
n -= k;
}
}
if (_play_handle)
{
n = len;
while (n)
{
k = play_init (n);
for (i = 0; i < _play_nchan; i++) clear_chan (i, k);
play_done (k);
n -= k;
}
}
return 0;
}
int Alsa_pcmi::play_init (snd_pcm_uframes_t len)
{
unsigned int i;
const snd_pcm_channel_area_t *a;
int err;
if (!_play_handle) {
return 0;
}
if ((err = snd_pcm_mmap_begin (_play_handle, &a, &_play_offs, &len)) < 0)
{
if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(play): %s.\n", snd_strerror (err));
return -1;
}
_play_step = (a->step) >> 3;
for (i = 0; i < _play_nchan; i++, a++)
{
_play_ptr [i] = (char *) a->addr + ((a->first + a->step * _play_offs) >> 3);
}
return len;
}
int Alsa_pcmi::capt_init (snd_pcm_uframes_t len)
{
unsigned int i;
const snd_pcm_channel_area_t *a;
int err;
if (!_capt_handle) {
return 0;
}
if ((err = snd_pcm_mmap_begin (_capt_handle, &a, &_capt_offs, &len)) < 0)
{
if (_debug & DEBUG_DATA) fprintf (stderr, "Alsa_pcmi: snd_pcm_mmap_begin(capt): %s.\n", snd_strerror (err));
return -1;
}
_capt_step = (a->step) >> 3;
for (i = 0; i < _capt_nchan; i++, a++)
{
_capt_ptr [i] = (char *) a->addr + ((a->first + a->step * _capt_offs) >> 3);
}
return len;
}
void Alsa_pcmi::clear_chan (int chan, int len)
{
_play_ptr [chan] = (this->*Alsa_pcmi::_clear_func)(_play_ptr [chan], len);
}
void Alsa_pcmi::play_chan (int chan, const float *src, int len, int step)
{
_play_ptr [chan] = (this->*Alsa_pcmi::_play_func)(src, _play_ptr [chan], len, step);
}
void Alsa_pcmi::capt_chan (int chan, float *dst, int len, int step)
{
_capt_ptr [chan] = (this->*Alsa_pcmi::_capt_func)(_capt_ptr [chan], dst, len, step);
}
int Alsa_pcmi::play_done (int len)
{
if (!_play_handle) return 0;
return snd_pcm_mmap_commit (_play_handle, _play_offs, len);
}
int Alsa_pcmi::capt_done (int len)
{
if (!_capt_handle) return 0;
return snd_pcm_mmap_commit (_capt_handle, _capt_offs, len);
}
void Alsa_pcmi::printinfo (void)
{
fprintf (stdout, "playback :");
if (_play_handle)
{
fprintf (stdout, "\n nchan : %d\n", _play_nchan);
fprintf (stdout, " fsamp : %d\n", _fsamp);
fprintf (stdout, " fsize : %ld\n", _fsize);
fprintf (stdout, " nfrag : %d\n", _play_nfrag);
fprintf (stdout, " format : %s\n", snd_pcm_format_name (_play_format));
}
else fprintf (stdout, " not enabled\n");
fprintf (stdout, "capture :");
if (_capt_handle)
{
fprintf (stdout, "\n nchan : %d\n", _capt_nchan);
fprintf (stdout, " fsamp : %d\n", _fsamp);
fprintf (stdout, " fsize : %ld\n", _fsize);
fprintf (stdout, " nfrag : %d\n", _capt_nfrag);
fprintf (stdout, " format : %s\n", snd_pcm_format_name (_capt_format));
if (_play_handle) fprintf (stdout, "%s\n", _synced ? "synced" : "not synced");
}
else fprintf (stdout, " not enabled\n");
}
// Private members ---------------------------------------------------------------------
void Alsa_pcmi::initialise (const char *play_name, const char *capt_name, const char *ctrl_name)
{
unsigned int fsamp;
snd_pcm_uframes_t fsize;
unsigned int nfrag;
int err;
int dir;
snd_ctl_card_info_t *card;
if (play_name)
{
if (snd_pcm_open (&_play_handle, play_name, SND_PCM_STREAM_PLAYBACK, 0) < 0)
{
_play_handle = 0;
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for playback.\n",
play_name);
}
}
if (capt_name)
{
if (snd_pcm_open (&_capt_handle, capt_name, SND_PCM_STREAM_CAPTURE, 0) < 0)
{
_capt_handle = 0;
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: Cannot open PCM device %s for capture.\n",
capt_name);
}
}
if (! _play_handle && ! _capt_handle) return;
if (ctrl_name)
{
snd_ctl_card_info_alloca (&card);
if ((err = snd_ctl_open (&_ctrl_handle, ctrl_name, 0)) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alse_driver: ctl_open(): %s\n",
snd_strerror (err));
return;
}
if ((err = snd_ctl_card_info (_ctrl_handle, card)) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: ctl_card_info(): %s\n",
snd_strerror (err));
return;
}
}
_state = -2;
if (_play_handle)
{
if (snd_pcm_hw_params_malloc (&_play_hwpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback hw params\n");
return;
}
if (snd_pcm_sw_params_malloc (&_play_swpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate playback sw params\n");
return;
}
if (set_hwpar (_play_handle, _play_hwpar, "playback", _play_nfrag, &_play_nchan) < 0) return;
if (set_swpar (_play_handle, _play_swpar, "playback") < 0) return;
}
if (_capt_handle)
{
if (snd_pcm_hw_params_malloc (&_capt_hwpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture hw params\n");
return;
}
if (snd_pcm_sw_params_malloc (&_capt_swpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't allocate capture sw params\n");
return;
}
if (set_hwpar (_capt_handle, _capt_hwpar, "capture", _capt_nfrag, &_capt_nchan) < 0) return;
if (set_swpar (_capt_handle, _capt_swpar, "capture") < 0) return;
}
if (_play_handle)
{
if (snd_pcm_hw_params_get_rate (_play_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for playback.\n");
_state = -3;
return;
}
if (snd_pcm_hw_params_get_period_size (_play_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for playback.\n");
_state = -4;
return;
}
if (snd_pcm_hw_params_get_periods (_play_hwpar, &nfrag, &dir) || (nfrag != _play_nfrag) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for playback.\n");
_state = -5;
return;
}
snd_pcm_hw_params_get_format (_play_hwpar, &_play_format);
snd_pcm_hw_params_get_access (_play_hwpar, &_play_access);
#if __BYTE_ORDER == __LITTLE_ENDIAN
switch (_play_format)
{
case SND_PCM_FORMAT_FLOAT_LE:
_clear_func = &Alsa_pcmi::clear_32;
_play_func = &Alsa_pcmi::play_float;
break;
case SND_PCM_FORMAT_S32_LE:
_clear_func = &Alsa_pcmi::clear_32;
_play_func = &Alsa_pcmi::play_32;
break;
case SND_PCM_FORMAT_S32_BE:
_clear_func = &Alsa_pcmi::clear_32;
_play_func = &Alsa_pcmi::play_32swap;
break;
case SND_PCM_FORMAT_S24_3LE:
_clear_func = &Alsa_pcmi::clear_24;
_play_func = &Alsa_pcmi::play_24;
break;
case SND_PCM_FORMAT_S24_3BE:
_clear_func = &Alsa_pcmi::clear_24;
_play_func = &Alsa_pcmi::play_24swap;
break;
case SND_PCM_FORMAT_S16_LE:
_clear_func = &Alsa_pcmi::clear_16;
_play_func = &Alsa_pcmi::play_16;
break;
case SND_PCM_FORMAT_S16_BE:
_clear_func = &Alsa_pcmi::clear_16;
_play_func = &Alsa_pcmi::play_16swap;
break;
default:
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
_state = -6;
return;
}
#elif __BYTE_ORDER == __BIG_ENDIAN
switch (_play_format)
{
case SND_PCM_FORMAT_S32_LE:
_clear_func = &Alsa_pcmi::clear_32;
_play_func = &Alsa_pcmi::play_32swap;
break;
case SND_PCM_FORMAT_S32_BE:
_clear_func = &Alsa_pcmi::clear_32;
_play_func = &Alsa_pcmi::play_32;
break;
case SND_PCM_FORMAT_S24_3LE:
_clear_func = &Alsa_pcmi::clear_24;
_play_func = &Alsa_pcmi::play_24swap;
break;
case SND_PCM_FORMAT_S24_3BE:
_clear_func = &Alsa_pcmi::clear_24;
_play_func = &Alsa_pcmi::play_24;
break;
case SND_PCM_FORMAT_S16_LE:
_clear_func = &Alsa_pcmi::clear_16;
_play_func = &Alsa_pcmi::play_16swap;
break;
case SND_PCM_FORMAT_S16_BE:
_clear_func = &Alsa_pcmi::clear_16;
_play_func = &Alsa_pcmi::play_16;
break;
default:
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle playback sample format.\n");
_state = -6;
return;
}
#else
#error "System byte order is undefined or not supported"
#endif
_play_npfd = snd_pcm_poll_descriptors_count (_play_handle);
}
if (_capt_handle)
{
if (snd_pcm_hw_params_get_rate (_capt_hwpar, &fsamp, &dir) || (fsamp != _fsamp) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested sample rate for capture.\n");
_state = -3;
return;
}
if (snd_pcm_hw_params_get_period_size (_capt_hwpar, &fsize, &dir) || (fsize != _fsize) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested period size for capture.\n");
_state = -4;
return;
}
if (snd_pcm_hw_params_get_periods (_capt_hwpar, &nfrag, &dir) || (nfrag != _capt_nfrag) || dir)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't get requested number of periods for capture.\n");
_state = -5;
return;
}
if (_play_handle) _synced = ! snd_pcm_link (_play_handle, _capt_handle);
snd_pcm_hw_params_get_format (_capt_hwpar, &_capt_format);
snd_pcm_hw_params_get_access (_capt_hwpar, &_capt_access);
#if __BYTE_ORDER == __LITTLE_ENDIAN
switch (_capt_format)
{
case SND_PCM_FORMAT_FLOAT_LE:
_capt_func = &Alsa_pcmi::capt_float;
break;
case SND_PCM_FORMAT_S32_LE:
_capt_func = &Alsa_pcmi::capt_32;
break;
case SND_PCM_FORMAT_S32_BE:
_capt_func = &Alsa_pcmi::capt_32swap;
break;
case SND_PCM_FORMAT_S24_3LE:
_capt_func = &Alsa_pcmi::capt_24;
break;
case SND_PCM_FORMAT_S24_3BE:
_capt_func = &Alsa_pcmi::capt_24swap;
break;
case SND_PCM_FORMAT_S16_LE:
_capt_func = &Alsa_pcmi::capt_16;
break;
case SND_PCM_FORMAT_S16_BE:
_capt_func = &Alsa_pcmi::capt_16swap;
break;
default:
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
_state = -6;
return;
}
#elif __BYTE_ORDER == __BIG_ENDIAN
switch (_capt_format)
{
case SND_PCM_FORMAT_S32_LE:
_capt_func = &Alsa_pcmi::capt_32swap;
break;
case SND_PCM_FORMAT_S32_BE:
_capt_func = &Alsa_pcmi::capt_32;
break;
case SND_PCM_FORMAT_S24_3LE:
_capt_func = &Alsa_pcmi::capt_24swap;
break;
case SND_PCM_FORMAT_S24_3BE:
_capt_func = &Alsa_pcmi::capt_24;
break;
case SND_PCM_FORMAT_S16_LE:
_capt_func = &Alsa_pcmi::capt_16swap;
break;
case SND_PCM_FORMAT_S16_BE:
_capt_func = &Alsa_pcmi::capt_16;
break;
default:
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't handle capture sample format.\n");
_state = -6;
return;
}
#else
#error "System byte order is undefined or not supported"
#endif
_capt_npfd = snd_pcm_poll_descriptors_count (_capt_handle);
}
if (_play_npfd + _capt_npfd > MAXPFD)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: interface requires more than %d pollfd\n", MAXPFD);
return;
}
_state = 0;
}
int Alsa_pcmi::set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int nfrag, unsigned int *nchan)
{
bool err;
if (snd_pcm_hw_params_any (handle, hwpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no %s hw configurations available.\n",
sname);
return -1;
}
if (snd_pcm_hw_params_set_periods_integer (handle, hwpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to integral value.\n",
sname);
return -1;
}
if ( (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_NONINTERLEAVED) < 0)
&& (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0)
&& (snd_pcm_hw_params_set_access (handle, hwpar, SND_PCM_ACCESS_MMAP_COMPLEX) < 0))
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: the %s interface doesn't support mmap-based access.\n",
sname);
return -1;
}
if (_debug & FORCE_16B)
{
err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
}
else
{
err = (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_FLOAT_LE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_LE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S32_BE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3LE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S24_3BE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_LE) < 0)
&& (snd_pcm_hw_params_set_format (handle, hwpar, SND_PCM_FORMAT_S16_BE) < 0);
}
if (err)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: no supported sample format on %s interface.\n.",
sname);
return -1;
}
if (snd_pcm_hw_params_set_rate (handle, hwpar, _fsamp, 0) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s sample rate to %u.\n",
sname, _fsamp);
return -3;
}
snd_pcm_hw_params_get_channels_max (hwpar, nchan);
if (*nchan > 1024)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: detected more than 1024 %s channnels, reset to 2.\n",
sname);
*nchan = 2;
}
if (_debug & FORCE_2CH)
{
*nchan = 2;
}
if (*nchan > MAXCHAN)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: number of %s channels reduced to %d.\n",
sname, MAXCHAN);
*nchan = MAXCHAN;
}
if (snd_pcm_hw_params_set_channels (handle, hwpar, *nchan) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s channel count to %u.\n",
sname, *nchan);
return -1;
}
if (snd_pcm_hw_params_set_period_size (handle, hwpar, _fsize, 0) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s period size to %lu.\n",
sname, _fsize);
return -4;
}
if (snd_pcm_hw_params_set_periods (handle, hwpar, nfrag, 0) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s periods to %u.\n",
sname, nfrag);
return -5;
}
if (snd_pcm_hw_params_set_buffer_size (handle, hwpar, _fsize * nfrag) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s buffer length to %lu.\n",
sname, _fsize * nfrag);
return -4;
}
if (snd_pcm_hw_params (handle, hwpar) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s hardware parameters.\n",
sname);
return -1;
}
return 0;
}
int Alsa_pcmi::set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname)
{
int err;
snd_pcm_sw_params_current (handle, swpar);
if ((err = snd_pcm_sw_params_set_tstamp_mode (handle, swpar, SND_PCM_TSTAMP_MMAP)) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s timestamp mode to %u.\n",
sname, SND_PCM_TSTAMP_MMAP);
return -1;
}
if ((err = snd_pcm_sw_params_set_avail_min (handle, swpar, _fsize)) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s avail_min to %lu.\n",
sname, _fsize);
return -1;
}
if ((err = snd_pcm_sw_params (handle, swpar)) < 0)
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: can't set %s software parameters.\n",
sname);
return -1;
}
return 0;
}
int Alsa_pcmi::recover (void)
{
int err;
snd_pcm_status_t *stat;
snd_pcm_status_alloca (&stat);
if (_play_handle)
{
if ((err = snd_pcm_status (_play_handle, stat)) < 0)
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(play): %s\n",
snd_strerror (err));
}
_play_xrun = xruncheck (stat);
}
if (_capt_handle)
{
if ((err = snd_pcm_status (_capt_handle, stat)) < 0)
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_status(capt): %s\n",
snd_strerror (err));
}
_capt_xrun = xruncheck (stat);
}
if (pcm_stop ()) return -1;
if (_play_handle && ((err = snd_pcm_prepare (_play_handle)) < 0))
{
if (_debug & DEBUG_STAT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(play): %s\n",
snd_strerror (err));
return -1;
}
if (_capt_handle && !_synced && ((err = snd_pcm_prepare (_capt_handle)) < 0))
{
if (_debug & DEBUG_INIT) fprintf (stderr, "Alsa_pcmi: pcm_prepare(capt): %s\n",
snd_strerror (err));
return -1;
}
if (pcm_start ()) return -1;
return 0;
}
float Alsa_pcmi::xruncheck (snd_pcm_status_t *stat)
{
struct timeval tupd, trig;
int ds, du;
if (snd_pcm_status_get_state (stat) == SND_PCM_STATE_XRUN)
{
snd_pcm_status_get_tstamp (stat, &tupd);
snd_pcm_status_get_trigger_tstamp (stat, &trig);
ds = tupd.tv_sec - trig.tv_sec;
du = tupd.tv_usec - trig.tv_usec;
if (du < 0)
{
du += 1000000;
ds -= 1;
}
return ds + 1e-6f * du;
}
return 0.0f;
}
char *Alsa_pcmi::clear_16 (char *dst, int nfrm)
{
while (nfrm--)
{
*((short int *) dst) = 0;
dst += _play_step;
}
return dst;
}
char *Alsa_pcmi::clear_24 (char *dst, int nfrm)
{
while (nfrm--)
{
dst [0] = 0;
dst [1] = 0;
dst [2] = 0;
dst += _play_step;
}
return dst;
}
char *Alsa_pcmi::clear_32 (char *dst, int nfrm)
{
while (nfrm--)
{
*((int *) dst) = 0;
dst += _play_step;
}
return dst;
}
char *Alsa_pcmi::play_16 (const float *src, char *dst, int nfrm, int step)
{
float s;
short int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x7fff;
else if (s < -1) d = 0x8001;
else d = (short int)((float) 0x7fff * s);
*((short int *) dst) = d;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_16swap (const float *src, char *dst, int nfrm, int step)
{
float s;
short int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x7fff;
else if (s < -1) d = 0x8001;
else d = (short int)((float) 0x7fff * s);
dst [0] = d >> 8;
dst [1] = d;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_24 (const float *src, char *dst, int nfrm, int step)
{
float s;
int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x007fffff;
else if (s < -1) d = 0x00800001;
else d = (int)((float) 0x007fffff * s);
dst [0] = d;
dst [1] = d >> 8;
dst [2] = d >> 16;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_24swap (const float *src, char *dst, int nfrm, int step)
{
float s;
int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x007fffff;
else if (s < -1) d = 0x00800001;
else d = (int)((float) 0x007fffff * s);
dst [0] = d >> 16;
dst [1] = d >> 8;
dst [2] = d;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_32 (const float *src, char *dst, int nfrm, int step)
{
float s;
int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x007fffff;
else if (s < -1) d = 0x00800001;
else d = (int)((float) 0x007fffff * s);
*((int *) dst) = d << 8;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_32swap (const float *src, char *dst, int nfrm, int step)
{
float s;
int d;
while (nfrm--)
{
s = *src;
if (s > 1) d = 0x007fffff;
else if (s < -1) d = 0x00800001;
else d = (int)((float) 0x007fffff * s);
dst [0] = d >> 16;
dst [1] = d >> 8;
dst [2] = d;
dst [3] = 0;
dst += _play_step;
src += step;
}
return dst;
}
char *Alsa_pcmi::play_float (const float *src, char *dst, int nfrm, int step)
{
while (nfrm--)
{
*((float *) dst) = *src;
dst += _play_step;
src += step;
}
return dst;
}
const char *Alsa_pcmi::capt_16 (const char *src, float *dst, int nfrm, int step)
{
while (nfrm--)
{
const short int s = *((short int const *) src);
const float d = (float) s / (float) 0x7fff;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_16swap (const char *src, float *dst, int nfrm, int step)
{
float d;
short int s;
while (nfrm--)
{
s = (src [0] & 0xFF) << 8;
s += (src [1] & 0xFF);
d = (float) s / (float) 0x7fff;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_24 (const char *src, float *dst, int nfrm, int step)
{
float d;
int s;
while (nfrm--)
{
s = (src [0] & 0xFF);
s += (src [1] & 0xFF) << 8;
s += (src [2] & 0xFF) << 16;
if (s & 0x00800000) s-= 0x01000000;
d = (float) s / (float) 0x007fffff;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_24swap (const char *src, float *dst, int nfrm, int step)
{
float d;
int s;
while (nfrm--)
{
s = (src [0] & 0xFF) << 16;
s += (src [1] & 0xFF) << 8;
s += (src [2] & 0xFF);
if (s & 0x00800000) s-= 0x01000000;
d = (float) s / (float) 0x007fffff;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_32 (const char *src, float *dst, int nfrm, int step)
{
while (nfrm--)
{
const int s = *((int const *) src);
const float d = (float) s / (float) 0x7fffff00;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_32swap (const char *src, float *dst, int nfrm, int step)
{
float d;
int s;
while (nfrm--)
{
s = (src [0] & 0xFF) << 24;
s += (src [1] & 0xFF) << 16;
s += (src [2] & 0xFF) << 8;
d = (float) s / (float) 0x7fffff00;
*dst = d;
dst += step;
src += _capt_step;
}
return src;
}
const char *Alsa_pcmi::capt_float (const char *src, float *dst, int nfrm, int step)
{
while (nfrm--)
{
*dst = *((float const *) src);
dst += step;
src += _capt_step;
}
return src;
}
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