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/*
* audio_out_oss.c
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec 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.
*
* a52dec 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 this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#ifdef LIBAO_OSS
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#if defined(__OpenBSD__) || defined(__NetBSD__)
#include <soundcard.h>
#else
#include <sys/soundcard.h>
#if defined(__FreeBSD__)
#ifndef AFMT_S16_NE
#include <machine/endian.h>
#if BYTE_ORDER == LITTLE_ENDIAN
#define AFMT_S16_NE AFMT_S16_LE
#else
#define AFMT_S16_NE AFMT_S16_BE
#endif
#endif
#endif
#endif
#if defined(__NetBSD__)
#define OSS_DEVICE "/dev/audio"
#else
#define OSS_DEVICE "/dev/dsp"
#endif
#include "dca.h"
#include "audio_out.h"
#include "audio_out_internal.h"
typedef struct oss_instance_s {
ao_instance_t ao;
int fd;
int sample_rate;
int set_params;
int flags;
} oss_instance_t;
static int oss_setup (ao_instance_t * _instance, int sample_rate, int * flags,
level_t * level, sample_t * bias)
{
oss_instance_t * instance = (oss_instance_t *) _instance;
if ((instance->set_params == 0) && (instance->sample_rate != sample_rate))
return 1;
instance->sample_rate = sample_rate;
*flags = instance->flags;
*level = CONVERT_LEVEL;
*bias = CONVERT_BIAS;
return 0;
}
static int oss_play (ao_instance_t * _instance, int flags, sample_t * _samples)
{
oss_instance_t * instance = (oss_instance_t *) _instance;
int16_t int16_samples[256*6];
int chans = -1;
#ifdef LIBDCA_DOUBLE
convert_t samples[256 * 6];
int i;
for (i = 0; i < 256 * 6; i++)
samples[i] = _samples[i];
#else
convert_t * samples = _samples;
#endif
chans = channels_multi (flags);
flags &= DCA_CHANNEL_MASK | DCA_LFE;
if (instance->set_params) {
int tmp;
tmp = chans;
if ((ioctl (instance->fd, SNDCTL_DSP_CHANNELS, &tmp) < 0) ||
(tmp != chans)) {
fprintf (stderr, "Can not set number of channels (%i)\n", chans);
return 1;
}
tmp = instance->sample_rate;
if ((ioctl (instance->fd, SNDCTL_DSP_SPEED, &tmp) < 0) ||
(tmp != instance->sample_rate)) {
fprintf (stderr, "Can not set sample rate (%i)\n",
instance->sample_rate);
return 1;
}
instance->flags = flags;
instance->set_params = 0;
} else if ((flags == DCA_DOLBY) && (instance->flags == DCA_STEREO)) {
fprintf (stderr, "Switching from stereo to dolby surround\n");
instance->flags = DCA_DOLBY;
} else if ((flags == DCA_STEREO) && (instance->flags == DCA_DOLBY)) {
fprintf (stderr, "Switching from dolby surround to stereo\n");
instance->flags = DCA_STEREO;
} else if (flags != instance->flags)
return 1;
convert2s16_multi (samples, int16_samples, flags);
write (instance->fd, int16_samples, 256 * sizeof (int16_t) * chans);
return 0;
}
static void oss_close (ao_instance_t * _instance)
{
oss_instance_t * instance = (oss_instance_t *) _instance;
close (instance->fd);
}
static ao_instance_t * oss_open (int flags)
{
oss_instance_t * instance;
int format;
instance = (oss_instance_t *) malloc (sizeof (oss_instance_t));
if (instance == NULL)
return NULL;
instance->ao.setup = oss_setup;
instance->ao.play = oss_play;
instance->ao.close = oss_close;
instance->sample_rate = 0;
instance->set_params = 1;
instance->flags = flags;
instance->fd = open (OSS_DEVICE, O_WRONLY);
if (instance->fd < 0) {
fprintf (stderr, "Can not open " OSS_DEVICE "\n");
free (instance);
return NULL;
}
format = AFMT_S16_NE;
if ((ioctl (instance->fd, SNDCTL_DSP_SETFMT, &format) < 0) ||
(format != AFMT_S16_NE)) {
fprintf (stderr, "Can not set sample format\n");
free (instance);
return NULL;
}
return (ao_instance_t *) instance;
}
ao_instance_t * ao_oss_open (void)
{
return oss_open (DCA_STEREO);
}
ao_instance_t * ao_ossdolby_open (void)
{
return oss_open (DCA_DOLBY);
}
ao_instance_t * ao_oss4_open (void)
{
return oss_open (DCA_2F2R);
}
ao_instance_t * ao_oss6_open (void)
{
return oss_open (DCA_3F2R | DCA_LFE);
}
#endif
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