/*
* audio_out_aif.c
* Copyright (C) 2000-2002 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <inttypes.h>
#include "a52.h"
#include "audio_out.h"
#include "audio_out_internal.h"
typedef struct aif_instance_s {
ao_instance_t ao;
int sample_rate;
int set_params;
int flags;
int size;
} aif_instance_t;
static uint8_t aif_header[] = {
'F', 'O', 'R', 'M', 0xff, 0xff, 0xff, 0xfe, 'A', 'I', 'F', 'F',
'C', 'O', 'M', 'M', 0, 0, 0, 18,
0, 2, 0x3f, 0xff, 0xff, 0xf4, 0, 16, 0x40, 0x0e, -1, -1, 0, 0, 0, 0, 0, 0,
'S', 'S', 'N', 'D', 0xff, 0xff, 0xff, 0xd8, 0, 0, 0, 0, 0, 0, 0, 0
};
static int aif_setup (ao_instance_t * _instance, int sample_rate, int * flags,
sample_t * level, sample_t * bias)
{
aif_instance_t * instance = (aif_instance_t *) _instance;
if ((instance->set_params == 0) && (instance->sample_rate != sample_rate))
return 1;
instance->sample_rate = sample_rate;
*flags = instance->flags;
*level = 1;
*bias = 384;
return 0;
}
static void store4 (uint8_t * buf, int value)
{
buf[0] = value >> 24;
buf[1] = value >> 16;
buf[2] = value >> 8;
buf[3] = value;
}
static void store2 (uint8_t * buf, int16_t value)
{
buf[0] = value >> 8;
buf[1] = value;
}
static int aif_play (ao_instance_t * _instance, int flags, sample_t * _samples)
{
aif_instance_t * instance = (aif_instance_t *) _instance;
int16_t int16_samples[256*2];
#ifdef LIBA52_DOUBLE
float samples[256 * 2];
int i;
for (i = 0; i < 256 * 2; i++)
samples[i] = _samples[i];
#else
float * samples = _samples;
#endif
if (instance->set_params) {
instance->set_params = 0;
store2 (aif_header + 30, instance->sample_rate);
fwrite (aif_header, sizeof (aif_header), 1, stdout);
}
float2s16_2 (samples, int16_samples);
s16_BE (int16_samples, 2);
fwrite (int16_samples, 256 * sizeof (int16_t) * 2, 1, stdout);
instance->size += 256 * sizeof (int16_t) * 2;
return 0;
}
static void aif_close (ao_instance_t * _instance)
{
aif_instance_t * instance = (aif_instance_t *) _instance;
if (fseek (stdout, 0, SEEK_SET) < 0)
return;
store4 (aif_header + 4, instance->size + 46);
store4 (aif_header + 22, instance->size / 4);
store4 (aif_header + 42, instance->size + 8);
fwrite (aif_header, sizeof (aif_header), 1, stdout);
}
static ao_instance_t * aif_open (int flags)
{
aif_instance_t * instance;
instance = malloc (sizeof (aif_instance_t));
if (instance == NULL)
return NULL;
instance->ao.setup = aif_setup;
instance->ao.play = aif_play;
instance->ao.close = aif_close;
instance->sample_rate = 0;
instance->set_params = 1;
instance->flags = flags;
instance->size = 0;
return (ao_instance_t *) instance;
}
ao_instance_t * ao_aif_open (void)
{
return aif_open (A52_STEREO);
}
ao_instance_t * ao_aifdolby_open (void)
{
return aif_open (A52_DOLBY);
}