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/*
* lingot, a musical instrument tuner.
*
* Copyright (C) 2004-2011 Ibán Cereijo Graña, Jairo Chapela Martínez.
*
* This file is part of lingot.
*
* lingot 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.
*
* lingot 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 lingot; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include "lingot-defs.h"
#include "lingot-audio-alsa.h"
#include "lingot-i18n.h"
#include "lingot-msg.h"
LingotAudioHandler* lingot_audio_alsa_new(char* device, int sample_rate) {
LingotAudioHandler* audio = NULL;
# ifdef ALSA
const char* exception;
snd_pcm_hw_params_t* hw_params = NULL;
int err;
char error_message[1000];
unsigned int channels = 1;
audio = malloc(sizeof(LingotAudioHandler));
audio->read_buffer = NULL;
audio->audio_system = AUDIO_SYSTEM_ALSA;
audio->read_buffer_size = 128; // TODO: size up
// ALSA allocates some mem to load its config file when we call
// snd_card_next. Now that we're done getting the info, let's tell ALSA
// to unload the info and free up that mem
snd_config_update_free_global();
audio->capture_handle = NULL;
try {
if ((err = snd_pcm_open(&audio->capture_handle, device,
SND_PCM_STREAM_CAPTURE, 0)) < 0) {
sprintf(error_message, "Cannot open audio device %s.\n%s.", device,
snd_strerror(err));
throw(error_message);
}
strcpy(audio->device, device);
if ((err = snd_pcm_hw_params_malloc(&hw_params)) < 0) {
sprintf(error_message,
"Cannot allocate hardware parameter structure.\n%s.",
snd_strerror(err));
throw(error_message);
}
if ((err = snd_pcm_hw_params_any(audio->capture_handle, hw_params)) < 0) {
sprintf(error_message,
"Cannot initialize hardware parameter structure.\n%s.",
snd_strerror(err));
throw(error_message);
}
if ((err = snd_pcm_hw_params_set_access(audio->capture_handle,
hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
sprintf(error_message, "Cannot set access type.\n%s", snd_strerror(
err));
throw(error_message);
}
if ((err = snd_pcm_hw_params_set_format(audio->capture_handle,
hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
sprintf(error_message, "Cannot set sample format.\n%s.",
snd_strerror(err));
throw(error_message);
}
unsigned int rate = sample_rate;
if ((err = snd_pcm_hw_params_set_rate_near(audio->capture_handle,
hw_params, &rate, 0)) < 0) {
sprintf(error_message, "Cannot set sample rate.\n%s.",
snd_strerror(err));
throw(error_message);
}
audio->real_sample_rate = rate;
if ((err = snd_pcm_hw_params_set_channels(audio->capture_handle,
hw_params, channels)) < 0) {
sprintf(error_message, "Cannot set channel count.\n%s.",
snd_strerror(err));
throw(error_message);
}
if ((err = snd_pcm_hw_params(audio->capture_handle, hw_params)) < 0) {
sprintf(error_message, "Cannot set parameters.\n%s.", snd_strerror(
err));
throw(error_message);
}
if ((err = snd_pcm_prepare(audio->capture_handle)) < 0) {
sprintf(error_message,
"Cannot prepare audio interface for use.\n%s.",
snd_strerror(err));
throw(error_message);
}
audio->read_buffer = malloc(channels * audio->read_buffer_size
* sizeof(SAMPLE_TYPE));
memset(audio->read_buffer, 0, audio->read_buffer_size
* sizeof(SAMPLE_TYPE));
} catch {
if (audio->capture_handle != NULL)
snd_pcm_close(audio->capture_handle);
free(audio);
audio = NULL;
lingot_msg_add_error(exception);
}
if (hw_params != NULL)
snd_pcm_hw_params_free(hw_params);
# else
lingot_msg_add_error(
_("The application has not been built with ALSA support"));
# endif
return audio;
}
void lingot_audio_alsa_destroy(LingotAudioHandler* audio) {
# ifdef ALSA
if (audio != NULL) {
snd_pcm_close(audio->capture_handle);
free(audio->read_buffer);
}
# endif
}
int lingot_audio_alsa_read(LingotAudioHandler* audio) {
# ifdef ALSA
int temp_sret;
int i;
temp_sret = snd_pcm_readi(audio->capture_handle, audio->read_buffer,
audio->read_buffer_size);
// if (rand() < 0.001 * RAND_MAX)
// temp_sret = 0;
if (temp_sret != audio->read_buffer_size) {
char buff[100];
sprintf(buff, _("Read from audio interface failed.\n%s."),
snd_strerror(temp_sret));
lingot_msg_add_error(buff);
return -1;
}
// float point conversion
for (i = 0; i < audio->read_buffer_size; i++) {
audio->flt_read_buffer[i] = audio->read_buffer[i];
}
# endif
return 0;
}
LingotAudioSystemProperties* lingot_audio_alsa_get_audio_system_properties(
audio_system_t audio_system) {
LingotAudioSystemProperties* result =
(LingotAudioSystemProperties*) malloc(1
* sizeof(LingotAudioSystemProperties));
// TODO
result->forced_sample_rate = 0;
result->n_devices = 0;
result->devices = NULL;
result->n_sample_rates = 5;
result->sample_rates = malloc(result->n_sample_rates * sizeof(int));
result->sample_rates[0] = 8000;
result->sample_rates[1] = 11025;
result->sample_rates[2] = 22050;
result->sample_rates[3] = 44100;
result->sample_rates[4] = 48000;
return result;
}
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