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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 <sys/soundcard.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "lingot-msg.h"
#include "lingot-defs.h"
#include "lingot-audio-oss.h"
#include "lingot-i18n.h"
LingotAudioHandler* lingot_audio_oss_new(char* device, int sample_rate) {
int channels = 1;
int format = SAMPLE_FORMAT;
char error_message[100];
const char* exception;
LingotAudioHandler* audio = malloc(sizeof(LingotAudioHandler));
audio->audio_system = AUDIO_SYSTEM_OSS;
audio->dsp = open(device, O_RDONLY);
audio->read_buffer_size = 128; // TODO: size up
strcpy(audio->device, device);
try {
if (audio->dsp < 0) {
sprintf(error_message, _("Unable to open audio device %s.\n%s."),
device, strerror(errno));
throw(error_message);
}
//if (ioctl(audio->dsp, SOUND_PCM_READ_CHANNELS, &channels) < 0)
if (ioctl(audio->dsp, SNDCTL_DSP_CHANNELS, &channels) < 0) {
sprintf(error_message, _("Error setting number of channels.\n%s."),
strerror(errno));
throw(error_message);
}
// sample size
//if (ioctl(audio->dsp, SOUND_PCM_SETFMT, &format) < 0)
if (ioctl(audio->dsp, SNDCTL_DSP_SETFMT, &format) < 0) {
sprintf(error_message, _("Error setting bits per sample.\n%s."),
strerror(errno));
throw(error_message);
}
int fragment_size = 1;
int DMA_buffer_size = 512;
int param = 0;
for (param = 0; fragment_size < DMA_buffer_size; param++)
fragment_size <<= 1;
param |= 0x00ff0000;
if (ioctl(audio->dsp, SNDCTL_DSP_SETFRAGMENT, ¶m) < 0) {
sprintf(error_message, _("Error setting DMA buffer size.\n%s."),
strerror(errno));
throw(error_message);
}
if (ioctl(audio->dsp, SNDCTL_DSP_SPEED, &sample_rate) < 0) {
sprintf(error_message, _("Error setting sample rate.\n%s."),
strerror(errno));
throw(error_message);
}
audio->real_sample_rate = sample_rate;
audio->read_buffer = malloc(audio->read_buffer_size
* sizeof(SAMPLE_TYPE));
memset(audio->read_buffer, 0, audio->read_buffer_size
* sizeof(SAMPLE_TYPE));
} catch {
close(audio->dsp);
free(audio);
audio = NULL;
lingot_msg_add_error(exception);
}
return audio;
}
void lingot_audio_oss_destroy(LingotAudioHandler* audio) {
if (audio != NULL) {
close(audio->dsp);
free(audio->read_buffer);
}
}
int lingot_audio_oss_read(LingotAudioHandler* audio) {
int i;
int read_size;
read_size = read(audio->dsp, audio->read_buffer, audio->read_buffer_size
* sizeof(SAMPLE_TYPE));
// if (rand() < 0.001 * RAND_MAX)
// read_size = 0;
if (read_size != audio->read_buffer_size * sizeof(SAMPLE_TYPE)) {
char buff[100];
sprintf(buff, _("Read from audio interface failed.\n%s."), strerror(
errno));
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];
}
return 0;
}
LingotAudioSystemProperties* lingot_audio_oss_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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