89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/*
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* Copyright (C) 2015 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2013 Paul Davis
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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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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_buffer_size_min (hw_params, &nfo->min_size);
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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, &nfo->max_size);
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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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snd_pcm_close (pcm);
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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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