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/*
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* audio_out_aif.c
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* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* a52dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* a52dec is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <inttypes.h>
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#include "a52.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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typedef struct aif_instance_s {
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ao_instance_t ao;
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int sample_rate;
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int set_params;
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int flags;
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int size;
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} aif_instance_t;
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static uint8_t aif_header[] = {
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'F', 'O', 'R', 'M', 0xff, 0xff, 0xff, 0xfe, 'A', 'I', 'F', 'F',
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'C', 'O', 'M', 'M', 0, 0, 0, 18,
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0, 2, 0x3f, 0xff, 0xff, 0xf4, 0, 16, 0x40, 0x0e, -1, -1, 0, 0, 0, 0, 0, 0,
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'S', 'S', 'N', 'D', 0xff, 0xff, 0xff, 0xd8, 0, 0, 0, 0, 0, 0, 0, 0
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};
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static int aif_setup (ao_instance_t * _instance, int sample_rate, int * flags,
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sample_t * level, sample_t * bias)
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{
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aif_instance_t * instance = (aif_instance_t *) _instance;
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if ((instance->set_params == 0) && (instance->sample_rate != sample_rate))
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return 1;
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instance->sample_rate = sample_rate;
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*flags = instance->flags;
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*level = 1;
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*bias = 384;
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return 0;
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}
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static void store4 (uint8_t * buf, int value)
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{
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buf[0] = value >> 24;
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buf[1] = value >> 16;
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buf[2] = value >> 8;
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buf[3] = value;
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}
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static void store2 (uint8_t * buf, int16_t value)
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{
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buf[0] = value >> 8;
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buf[1] = value;
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}
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static int aif_play (ao_instance_t * _instance, int flags, sample_t * _samples)
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{
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aif_instance_t * instance = (aif_instance_t *) _instance;
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int16_t int16_samples[256*2];
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#ifdef LIBA52_DOUBLE
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float samples[256 * 2];
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int i;
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for (i = 0; i < 256 * 2; i++)
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samples[i] = _samples[i];
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#else
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float * samples = _samples;
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#endif
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if (instance->set_params) {
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instance->set_params = 0;
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store2 (aif_header + 30, instance->sample_rate);
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fwrite (aif_header, sizeof (aif_header), 1, stdout);
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}
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float2s16_2 (samples, int16_samples);
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s16_BE (int16_samples, 2);
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fwrite (int16_samples, 256 * sizeof (int16_t) * 2, 1, stdout);
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instance->size += 256 * sizeof (int16_t) * 2;
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return 0;
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}
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static void aif_close (ao_instance_t * _instance)
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{
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aif_instance_t * instance = (aif_instance_t *) _instance;
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if (fseek (stdout, 0, SEEK_SET) < 0)
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return;
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store4 (aif_header + 4, instance->size + 46);
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store4 (aif_header + 22, instance->size / 4);
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store4 (aif_header + 42, instance->size + 8);
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fwrite (aif_header, sizeof (aif_header), 1, stdout);
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}
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static ao_instance_t * aif_open (int flags)
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{
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aif_instance_t * instance;
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instance = malloc (sizeof (aif_instance_t));
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if (instance == NULL)
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return NULL;
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instance->ao.setup = aif_setup;
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instance->ao.play = aif_play;
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instance->ao.close = aif_close;
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instance->sample_rate = 0;
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instance->set_params = 1;
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instance->flags = flags;
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instance->size = 0;
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return (ao_instance_t *) instance;
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}
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ao_instance_t * ao_aif_open (void)
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{
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return aif_open (A52_STEREO);
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}
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ao_instance_t * ao_aifdolby_open (void)
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{
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return aif_open (A52_DOLBY);
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}
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