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/*
* audio_out_null.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"
#include <inttypes.h>
#include "dca.h"
#include "audio_out.h"
#include "audio_out_internal.h"
typedef struct null_instance_s {
ao_instance_t ao;
int channels;
} null_instance_t;
static int null_setup (ao_instance_t * _instance, int sample_rate, int * flags,
level_t * level, sample_t * bias)
{
null_instance_t * instance = (null_instance_t *) _instance;
*flags = instance->channels;
*level = CONVERT_LEVEL;
*bias = CONVERT_BIAS;
(void)sample_rate;
return 0;
}
static int null_play (ao_instance_t * instance, int flags, sample_t * samples)
{
(void)instance; (void)flags; (void)samples;
return 0;
}
static void null_close (ao_instance_t * instance)
{
(void)instance;
}
static null_instance_t instance = {{null_setup, null_play, null_close}, 0};
ao_instance_t * ao_null_open (void)
{
instance.channels = DCA_STEREO;
return (ao_instance_t *) &instance;
}
ao_instance_t * ao_null4_open (void)
{
instance.channels = DCA_2F2R;
return (ao_instance_t *) &instance;
}
ao_instance_t * ao_null6_open (void)
{
instance.channels = DCA_3F2R | DCA_LFE;
return (ao_instance_t *) &instance;
}
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