136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
/*
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* Copyright (C) 2015-2019 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <alsa/asoundlib.h>
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#include "pbd/convert.h"
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#include "ardouralsautil/deviceinfo.h"
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using namespace std;
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int
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ARDOUR::get_alsa_device_parameters (const char* device_name, const bool play, ALSADeviceInfo *nfo)
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{
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snd_pcm_t *pcm;
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snd_pcm_hw_params_t *hw_params;
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std::string errmsg;
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int err;
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nfo->valid = false;
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unsigned long min_psiz, max_psiz;
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unsigned long min_bufz, max_bufz;
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err = snd_pcm_open (&pcm, device_name,
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play ? SND_PCM_STREAM_PLAYBACK : SND_PCM_STREAM_CAPTURE,
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SND_PCM_NONBLOCK);
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if (err < 0) {
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fprintf (stderr, "ALSA: Cannot open device '%s': %s\n", device_name, snd_strerror (err));
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return 1;
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}
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snd_pcm_hw_params_alloca (&hw_params);
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err = snd_pcm_hw_params_any (pcm, hw_params);
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if (err < 0) {
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errmsg = "Cannot get hardware parameters";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_channels_max (hw_params, &nfo->max_channels);
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if (err < 0) {
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errmsg = "Cannot get maximum channels count";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_rate_min (hw_params, &nfo->min_rate, NULL);
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if (err < 0) {
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errmsg = "Cannot get minimum rate";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_rate_max (hw_params, &nfo->max_rate, NULL);
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if (err < 0) {
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errmsg = "Cannot get maximum rate";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_period_size_min (hw_params, &min_psiz, 0);
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if (err < 0) {
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errmsg = "Cannot get minimum period size";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_period_size_max (hw_params, &max_psiz, 0);
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if (err < 0) {
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errmsg = "Cannot get maximum period size";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_buffer_size_min (hw_params, &min_bufz);
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if (err < 0) {
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errmsg = "Cannot get minimum buffer size";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_buffer_size_max (hw_params, &max_bufz);
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if (err < 0) {
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errmsg = "Cannot get maximum buffer size";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_periods_min (hw_params, &nfo->min_nper, 0);
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if (err < 0) {
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errmsg = "Cannot get minimum period count";
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goto error_out;
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}
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err = snd_pcm_hw_params_get_periods_max (hw_params, &nfo->max_nper, 0);
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if (err < 0) {
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errmsg = "Cannot get maximum period count";
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goto error_out;
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}
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snd_pcm_close (pcm);
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nfo->min_size = std::max (min_psiz, min_bufz / nfo->max_nper);
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nfo->max_size = std::min (max_psiz, max_bufz / nfo->min_nper);
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/* see also libs/backends/alsa/zita-alsa-pcmi.cc
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* If any debug parameter is set, print device info.
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*/
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if (getenv ("ARDOUR_ALSA_DEBUG")) {
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fprintf (stdout, "ALSA: *%s* device-info\n", play ? "playback" : "capture");
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fprintf (stdout, " dev_name : %s\n", device_name);
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fprintf (stdout, " channels : %u\n", nfo->max_channels);
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fprintf (stdout, " min_rate : %u\n", nfo->min_rate);
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fprintf (stdout, " max_rate : %u\n", nfo->max_rate);
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fprintf (stdout, " min_psiz : %lu\n", min_psiz);
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fprintf (stdout, " max_psiz : %lu\n", max_psiz);
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fprintf (stdout, " min_bufz : %lu\n", min_bufz);
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fprintf (stdout, " max_bufz : %lu\n", max_bufz);
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fprintf (stdout, " min_nper : %d\n", nfo->min_nper);
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fprintf (stdout, " max_nper : %d\n", nfo->max_nper);
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fprintf (stdout, " possible : %lu .. %lu\n", nfo->min_size, nfo->max_size);
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}
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nfo->valid = true;
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return 0;
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error_out:
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fprintf (stderr, "ALSA: %s: %s\n", errmsg.c_str(), snd_strerror (err));
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snd_pcm_close (pcm);
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return 1;
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}
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