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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* device.cc
*
* Wed Sep 24 08:54:47 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of LibAudioIO.
*
* LibAudioIO is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* LibAudioIO 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with LibAudioIO; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "device.h"
Device::Device(std::string device)
{
card = device;
}
Device::~Device()
{
}
std::vector<std::string> Device::mixerNames()
{
std::vector<std::string> mlist;
int err;
snd_mixer_t *handle;
snd_mixer_selem_id_t *sid;
snd_mixer_elem_t *elem;
snd_mixer_selem_id_alloca(&sid);
if((err = snd_mixer_open(&handle, 0)) < 0) {
printf("Mixer %s open error: %s", card.c_str(), snd_strerror(err));
return mlist;
}
if((err = snd_mixer_attach(handle, card.c_str())) < 0) {
printf("Mixer attach %s error: %s", card.c_str(), snd_strerror(err));
snd_mixer_close(handle);
return mlist;
}
if((err = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
printf("Mixer register error: %s", snd_strerror(err));
snd_mixer_close(handle);
return mlist;
}
err = snd_mixer_load(handle);
if (err < 0) {
printf("Mixer %s load error: %s", card.c_str(), snd_strerror(err));
snd_mixer_close(handle);
return mlist;
}
for(elem = snd_mixer_first_elem(handle);
elem;
elem = snd_mixer_elem_next(elem)) {
snd_mixer_selem_get_id(elem, sid);
if(snd_mixer_selem_is_active(elem) == 0) continue;
char cname[256];
snprintf(cname, sizeof(cname), "'%s',%i",
snd_mixer_selem_id_get_name(sid),
snd_mixer_selem_id_get_index(sid));
mlist.push_back(cname);
}
snd_mixer_close(handle);
return mlist;
}
Mixer *Device::getMixer(std::string name)
{
int err;
snd_mixer_t *handle;
snd_mixer_selem_id_t *sid;
snd_mixer_elem_t *elem;
snd_mixer_selem_id_alloca(&sid);
if((err = snd_mixer_open(&handle, 0)) < 0) {
printf("Mixer %s open error: %s", card.c_str(), snd_strerror(err));
return NULL;
}
if((err = snd_mixer_attach(handle, card.c_str())) < 0) {
printf("Mixer attach %s error: %s", card.c_str(), snd_strerror(err));
snd_mixer_close(handle);
return NULL;
}
if((err = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
printf("Mixer register error: %s", snd_strerror(err));
snd_mixer_close(handle);
return NULL;
}
err = snd_mixer_load(handle);
if (err < 0) {
printf("Mixer %s load error: %s", card.c_str(), snd_strerror(err));
snd_mixer_close(handle);
return NULL;
}
for(elem = snd_mixer_first_elem(handle);
elem;
elem = snd_mixer_elem_next(elem)) {
snd_mixer_selem_get_id(elem, sid);
if(snd_mixer_selem_is_active(elem) == 0) continue;
char cname[256];
snprintf(cname, sizeof(cname), "'%s',%i",
snd_mixer_selem_id_get_name(sid),
snd_mixer_selem_id_get_index(sid));
if(std::string(cname) == name) {
// NOTE: The Mixer object takes ownership of 'handle' which closed in
// its destructor.
return new Mixer(handle, elem);
}
}
snd_mixer_close(handle);
printf("Mixer element \"%s\" not found.\n", name.c_str());
return NULL;
}
static int pcm_init(snd_pcm_t *handle, unsigned int *samplerate,
unsigned int channels, snd_pcm_uframes_t *frames)
{
int err;
snd_pcm_hw_params_t *params;
// Allocate a hardware parameters object.
snd_pcm_hw_params_alloca(¶ms);
// Fill it in with default values.
err = snd_pcm_hw_params_any(handle, params);
if(err) {
printf("snd_pcm_hw_params_any: %s, %d\n", snd_strerror(err), err);
return 1;
}
// Interleaved mode
err = snd_pcm_hw_params_set_access(handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
if(err) {
printf("snd_pcm_hw_params_set_access: %s, %d\n", snd_strerror(err), err);
return 1;
}
// Signed 16-bit little-endian format
err = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
if(err) {
printf("snd_pcm_hw_params_set_format: %s, %d\n", snd_strerror(err), err);
return 1;
}
// Set channels (stereo/mono)
err = snd_pcm_hw_params_set_channels(handle, params, channels);
if(err) {
printf("snd_pcm_hw_params_set_channels: %s, %d\n", snd_strerror(err), err);
return 1;
}
// dir: -1 := exact or first below
// 0 := exact (error if not?)
// 1 := exact or first above
int dir = 1;
// Set sampling rate
err = snd_pcm_hw_params_set_rate_near(handle, params, samplerate, &dir);
if(err) {
printf("snd_pcm_hw_params_set_rate_near: %s, %d\n", snd_strerror(err), err);
return 1;
}
// printf("Actual samplerate: %d\n", samplerate);
err = snd_pcm_hw_params_set_period_size_near(handle, params, frames, &dir);
if(err) {
printf("snd_pcm_hw_params_set_period_size_near: %s, %d\n",
snd_strerror(err), err);
return 1;
}
// printf("Actual buffersize: %d\n", (int)frames);
// Write the parameters to the driver
err = snd_pcm_hw_params(handle, params);
if(err) {
printf("snd_pcm_hw_params: %s, %d\n",
snd_strerror(err), err);
return 1;
}
return 0;
}
Source *Device::getSource(std::string name, unsigned int samplerate,
unsigned int channels)
{
int open_mode = 0;
//open_mode |= SND_PCM_NONBLOCK;
//open_mode |= SND_PCM_NO_AUTO_RESAMPLE;
//open_mode |= SND_PCM_NO_AUTO_CHANNELS;
//open_mode |= SND_PCM_NO_AUTO_FORMAT;
//open_mode |= SND_PCM_NO_SOFTVOL;
int err;
snd_pcm_t *handle;
// Open PCM device for recording (capture).
err = snd_pcm_open(&handle, name.c_str(), SND_PCM_STREAM_CAPTURE,
open_mode);
if(err) {
printf("snd_pcm_open: %s, %d\n", snd_strerror(err), err);
return NULL;
}
snd_pcm_uframes_t frames = 512;
if(pcm_init(handle, &samplerate, channels, &frames)) return NULL;
return new Source(handle, samplerate, channels, frames);
}
Sink *Device::getSink(std::string name, unsigned int samplerate,
unsigned int channels)
{
int open_mode = 0;
//open_mode |= SND_PCM_NONBLOCK;
//open_mode |= SND_PCM_NO_AUTO_RESAMPLE;
//open_mode |= SND_PCM_NO_AUTO_CHANNELS;
//open_mode |= SND_PCM_NO_AUTO_FORMAT;
//open_mode |= SND_PCM_NO_SOFTVOL;
int err;
snd_pcm_t *handle;
// Open PCM device for recording (capture).
err = snd_pcm_open(&handle, name.c_str(), SND_PCM_STREAM_PLAYBACK,
open_mode);
if(err) {
printf("snd_pcm_open: %s, %d\n", snd_strerror(err), err);
return NULL;
}
snd_pcm_uframes_t frames = 512;
if(pcm_init(handle, &samplerate, channels, &frames)) return NULL;
return new Sink(handle, samplerate, channels, frames);
}
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