135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2015-2019 Robin Gareus <robin@gareus.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 2 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, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <alsa/asoundlib.h>
|
|
#include "pbd/convert.h"
|
|
#include "ardouralsautil/deviceinfo.h"
|
|
|
|
using namespace std;
|
|
|
|
int
|
|
ARDOUR::get_alsa_device_parameters (const char* device_name, const bool play, ALSADeviceInfo *nfo)
|
|
{
|
|
snd_pcm_t *pcm;
|
|
snd_pcm_hw_params_t *hw_params;
|
|
std::string errmsg;
|
|
int err;
|
|
|
|
nfo->valid = false;
|
|
|
|
unsigned long min_psiz, max_psiz;
|
|
unsigned long min_bufz, max_bufz;
|
|
|
|
err = snd_pcm_open (&pcm, device_name,
|
|
play ? SND_PCM_STREAM_PLAYBACK : SND_PCM_STREAM_CAPTURE,
|
|
SND_PCM_NONBLOCK);
|
|
|
|
if (err < 0) {
|
|
fprintf (stderr, "ALSA: Cannot open device '%s': %s\n", device_name, snd_strerror (err));
|
|
return 1;
|
|
}
|
|
|
|
snd_pcm_hw_params_alloca (&hw_params);
|
|
err = snd_pcm_hw_params_any (pcm, hw_params);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get hardware parameters";
|
|
goto error_out;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_channels_max (hw_params, &nfo->max_channels);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get maximum channels count";
|
|
goto error_out;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_rate_min (hw_params, &nfo->min_rate, NULL);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get minimum rate";
|
|
goto error_out;
|
|
}
|
|
err = snd_pcm_hw_params_get_rate_max (hw_params, &nfo->max_rate, NULL);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get maximum rate";
|
|
goto error_out;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_period_size_min (hw_params, &min_psiz, 0);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get minimum period size";
|
|
goto error_out;
|
|
}
|
|
err = snd_pcm_hw_params_get_period_size_max (hw_params, &max_psiz, 0);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get maximum period size";
|
|
goto error_out;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_buffer_size_min (hw_params, &min_bufz);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get minimum buffer size";
|
|
goto error_out;
|
|
}
|
|
err = snd_pcm_hw_params_get_buffer_size_max (hw_params, &max_bufz);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get maximum buffer size";
|
|
goto error_out;
|
|
}
|
|
|
|
err = snd_pcm_hw_params_get_periods_min (hw_params, &nfo->min_nper, 0);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get minimum period count";
|
|
goto error_out;
|
|
}
|
|
err = snd_pcm_hw_params_get_periods_max (hw_params, &nfo->max_nper, 0);
|
|
if (err < 0) {
|
|
errmsg = "Cannot get maximum period count";
|
|
goto error_out;
|
|
}
|
|
|
|
snd_pcm_close (pcm);
|
|
|
|
/* see also libs/backends/alsa/zita-alsa-pcmi.cc
|
|
* If any debug parameter is set, print device info.
|
|
*/
|
|
if (getenv ("ZITA_ALSA_PCMI_DEBUG")) {
|
|
fprintf (stdout, "ALSA: *%s* device-info\n", play ? "playback" : "capture");
|
|
fprintf (stdout, " dev_name : %s\n", device_name);
|
|
fprintf (stdout, " channels : %u\n", nfo->max_channels);
|
|
fprintf (stdout, " min_rate : %u\n", nfo->min_rate);
|
|
fprintf (stdout, " max_rate : %u\n", nfo->max_rate);
|
|
fprintf (stdout, " min_psiz : %lu\n", nfo->min_size);
|
|
fprintf (stdout, " max_psiz : %lu\n", nfo->max_size);
|
|
fprintf (stdout, " min_bufz : %lu\n", min_bufz);
|
|
fprintf (stdout, " max_bufz : %lu\n", max_bufz);
|
|
fprintf (stdout, " min_nper : %d\n", nfo->min_nper);
|
|
fprintf (stdout, " max_nper : %d\n", nfo->max_nper);
|
|
fprintf (stdout, " possible : %lu .. %lu\n", nfo->min_size, nfo->max_size);
|
|
}
|
|
|
|
nfo->min_size = std::max (min_psiz, min_bufz / nfo->max_nper);
|
|
nfo->max_size = std::min (max_psiz, max_bufz / nfo->min_nper);
|
|
nfo->valid = true;
|
|
return 0;
|
|
|
|
error_out:
|
|
fprintf (stderr, "ALSA: %s: %s\n", errmsg.c_str(), snd_strerror (err));
|
|
snd_pcm_close (pcm);
|
|
return 1;
|
|
|
|
}
|