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//-*- C++ -*-
/*
* lingot, a musical instrument tuner.
*
* Copyright (C) 2004-2007 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 <stdio.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include <stdlib.h>
#include "lingot-defs.h"
#include "lingot-audio.h"
LingotAudio *
lingot_audio_new (int channels, int rate, int format, char *fdsp)
{
LingotAudio *audio;
#ifdef ALSA
snd_pcm_hw_params_t *hw_params;
int err;
#endif
audio = malloc (sizeof (LingotAudio));
// int dma = 4;
#ifdef ALSA
if ((err =
snd_pcm_open (&audio->capture_handle, "default", SND_PCM_STREAM_CAPTURE,
0)) < 0)
{
fprintf (stderr, "cannot open audio device %s (%s)\n",
fdsp, snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0)
{
fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_any (audio->capture_handle, hw_params)) < 0)
{
fprintf (stderr,
"cannot initialize hardware parameter structure (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err =
snd_pcm_hw_params_set_access (audio->capture_handle, hw_params,
SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{
fprintf (stderr, "cannot set access type (%s)\n", snd_strerror (err));
exit (1);
}
if ((err =
snd_pcm_hw_params_set_format (audio->capture_handle, hw_params,
SND_PCM_FORMAT_S16_LE)) < 0)
{
fprintf (stderr, "cannot set sample format (%s)\n", snd_strerror (err));
exit (1);
}
if ((err =
snd_pcm_hw_params_set_rate_near (audio->capture_handle, hw_params,
&rate, 0)) < 0)
{
fprintf (stderr, "cannot set sample rate (%s)\n", snd_strerror (err));
exit (1);
}
if ((err =
snd_pcm_hw_params_set_channels (audio->capture_handle, hw_params,
channels)) < 0)
{
fprintf (stderr, "cannot set channel count (%s)\n", snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params (audio->capture_handle, hw_params)) < 0)
{
fprintf (stderr, "cannot set parameters (%s)\n", snd_strerror (err));
exit (1);
}
snd_pcm_hw_params_free (hw_params);
if ((err = snd_pcm_prepare (audio->capture_handle)) < 0)
{
fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
snd_strerror (err));
exit (1);
}
#else
audio->dsp = open (fdsp, O_RDONLY);
if (audio->dsp < 0)
{
char buff[80];
sprintf (buff, "Unable to open audio device %s", fdsp);
perror (buff);
exit (-1);
}
//if (ioctl(audio->dsp, SOUND_PCM_READ_CHANNELS, &channels) < 0)
if (ioctl (audio->dsp, SNDCTL_DSP_CHANNELS, &channels) < 0)
{
perror ("Error setting number of channels");
exit (-1);
}
/* if (ioctl(audio->dsp, SOUND_PCM_WRITE_CHANNELS, &channels) < 0)
{
perror("Error setting number of channels");
exit(-1);
} */
// sample size
//if (ioctl(audio->dsp, SOUND_PCM_SETFMT, &format) < 0)
if (ioctl (audio->dsp, SNDCTL_DSP_SETFMT, &format) < 0)
{
perror ("Error setting bits per sample");
exit (-1);
}
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)
{
perror ("Error setting DMA buffer size");
exit (-1);
}
// DMA divisor
/* if (ioctl(audio->dsp, SNDCTL_DSP_SUBDIVIDE, &dma) < 0)
{
perror("Error setting DMA divisor");
exit(-1);
}
// Rate de muestreo / reproduccion
if (ioctl(audio->dsp, SOUND_PCM_WRITE_RATE, &rate) < 0)
{
perror("Error setting write rate");
exit(-1);
} */
// if (ioctl(audio->dsp, SOUND_PCM_READ_RATE, &rate) < 0)
if (ioctl (audio->dsp, SNDCTL_DSP_SPEED, &rate) < 0)
{
perror ("Error setting sample rate");
exit (-1);
}
/*
// non-blocking reads.
if (fcntl(audio->dsp, F_SETFL, O_NONBLOCK) < 0)
{
perror("Error setting non-blocking reads");
exit(-1);
}
*/
#endif
return audio;
}
void
lingot_audio_destroy (LingotAudio * audio)
{
#ifdef ALSA
snd_pcm_close (audio->capture_handle);
#else
close (audio->dsp);
free (audio);
#endif
}
int
lingot_audio_read (LingotAudio * audio, void *buffer, int size)
{
#ifdef ALSA
return snd_pcm_readi (audio->capture_handle, buffer, size);
#else
return read (audio->dsp, buffer, size);
#endif
}
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