Blame libao/audio_out_wav.c

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/*
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 * audio_out_wav.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 wav_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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} wav_instance_t;
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static uint8_t wav_header[] = {
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    'R', 'I', 'F', 'F', 0xfc, 0xff, 0xff, 0xff, 'W', 'A', 'V', 'E',
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    'f', 'm', 't', ' ', 16, 0, 0, 0,
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    1, 0, 2, 0, -1, -1, -1, -1, -1, -1, -1, -1, 4, 0, 16, 0,
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    'd', 'a', 't', 'a', 0xd8, 0xff, 0xff, 0xff
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};
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static int wav_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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    wav_instance_t * instance = (wav_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 store (uint8_t * buf, int value)
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{
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    buf[0] = value;
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    buf[1] = value >> 8;
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    buf[2] = value >> 16;
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    buf[3] = value >> 24;
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}
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static int wav_play (ao_instance_t * _instance, int flags, sample_t * _samples)
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{
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    wav_instance_t * instance = (wav_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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	store (wav_header + 24, instance->sample_rate);
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	store (wav_header + 28, instance->sample_rate * 4);
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	fwrite (wav_header, sizeof (wav_header), 1, stdout);
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    }
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    float2s16_2 (samples, int16_samples);
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    s16_LE (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 wav_close (ao_instance_t * _instance)
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{
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    wav_instance_t * instance = (wav_instance_t *) _instance;
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    if (fseek (stdout, 0, SEEK_SET) < 0)
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	return;
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    store (wav_header + 4, instance->size + 36);
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    store (wav_header + 40, instance->size);
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    fwrite (wav_header, sizeof (wav_header), 1, stdout);
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}
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static ao_instance_t * wav_open (int flags)
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{
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    wav_instance_t * instance;
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    instance = malloc (sizeof (wav_instance_t));
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    if (instance == NULL)
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	return NULL;
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    instance->ao.setup = wav_setup;
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    instance->ao.play = wav_play;
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    instance->ao.close = wav_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_wav_open (void)
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{
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    return wav_open (A52_STEREO);
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}
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ao_instance_t * ao_wavdolby_open (void)
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{
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    return wav_open (A52_DOLBY);
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}