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/*
*
* ao_null.c
*
* Original Copyright (C) Aaron Holtzman - May 1999
* Modifications Copyright (C) Stan Seibert - July 2000, July 2001
*
* This file is part of libao, a cross-platform audio output library. See
* README for a history of this source code.
*
* libao 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, or (at your option)
* any later version.
*
* libao 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
********************************************************************
last mod: $Id: ao_null.c 17718 2010-12-06 20:09:29Z xiphmont $
********************************************************************/
#include <stdio.h>
#include <string.h>
#include <ao/ao.h>
static char *ao_null_options[] = {
"debug","verbose","matrix","quiet"
};
static ao_info ao_null_info = {
AO_TYPE_LIVE,
"Null output",
"null",
"Stan Seibert <volsung@asu.edu>",
"This driver does nothing.",
AO_FMT_NATIVE,
0,
ao_null_options,
sizeof(ao_null_options)/sizeof(*ao_null_options)
};
typedef struct ao_null_internal {
unsigned long byte_counter;
} ao_null_internal;
static int ao_null_test(void)
{
return 1; /* Null always works */
}
static ao_info *ao_null_driver_info(void)
{
return &ao_null_info;
}
static int ao_null_device_init(ao_device *device)
{
ao_null_internal *internal;
internal = (ao_null_internal *) malloc(sizeof(ao_null_internal));
if (internal == NULL)
return 0; /* Could not initialize device memory */
internal->byte_counter = 0;
device->internal = internal;
device->output_matrix_order = AO_OUTPUT_MATRIX_FIXED;
return 1; /* Memory alloc successful */
}
static int ao_null_set_option(ao_device *device, const char *key,
const char *value)
{
/*ao_null_internal *internal = (ao_null_internal *) device->internal;*/
(void)value;
(void)key;
(void)device;
return 1;
}
static int ao_null_open(ao_device *device, ao_sample_format *format)
{
/* Use whatever format the client requested */
device->driver_byte_format = device->client_byte_format;
if(!device->inter_matrix){
/* by default, we want inter == in */
if(format->matrix)
device->inter_matrix = _strdup(format->matrix);
}
return 1;
}
static int ao_null_play(ao_device *device, const char *output_samples,
uint_32 num_bytes)
{
ao_null_internal *internal = (ao_null_internal *)device->internal;
internal->byte_counter += num_bytes;
return 1;
}
static int ao_null_close(ao_device *device)
{
ao_null_internal *internal = (ao_null_internal *) device->internal;
adebug("%ld bytes sent to null device.\n", internal->byte_counter);
return 1;
}
static void ao_null_device_clear(ao_device *device)
{
ao_null_internal *internal = (ao_null_internal *) device->internal;
free(internal);
device->internal=NULL;
}
ao_functions ao_null = {
ao_null_test,
ao_null_driver_info,
ao_null_device_init,
ao_null_set_option,
ao_null_open,
ao_null_play,
ao_null_close,
ao_null_device_clear
};
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