/*

 * audio_out_al.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"

#ifdef LIBAO_AL

#include <stdio.h>

#include <stdlib.h>

#include <dmedia/audio.h>

#include <inttypes.h>

#include "a52.h"

#include "audio_out.h"

#include "audio_out_internal.h"

typedef struct al_instance_s {

    ao_instance_t ao;

    ALport port;

    int sample_rate;

    int set_params;

    int flags;

} al_instance_t;

static int al_setup (ao_instance_t * _instance, int sample_rate, int * flags,

		     sample_t * level, sample_t * bias)

{

    al_instance_t * instance = (al_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 int al_play (ao_instance_t * _instance, int flags, sample_t * _samples)

{

    al_instance_t * instance = (al_instance_t *) _instance;

    int16_t int16_samples[256*6];

    int chans = -1;

#ifdef LIBA52_DOUBLE

    float samples[256 * 6];

    int i;

    for (i = 0; i < 256 * 6; i++)

	samples[i] = _samples[i];

#else

    float * samples = _samples;

#endif

    chans = channels_multi (flags);

    flags &= A52_CHANNEL_MASK | A52_LFE;

    if (instance->set_params) {

	ALconfig config;

	ALpv params[2];

	config = alNewConfig ();

	if (!config) {

	    fprintf (stderr, "alNewConfig failed\n");

	    return 1;

	}

	if (alSetChannels (config, chans)) {

	    fprintf (stderr, "alSetChannels failed\n");

	    return 1;

	}

	if (alSetConfig (instance->port, config)) {

	    fprintf (stderr, "alSetConfig failed\n");

	    return 1;

	}

	alFreeConfig (config);

	params[0].param = AL_MASTER_CLOCK;

	params[0].value.i = AL_CRYSTAL_MCLK_TYPE;

	params[1].param = AL_RATE;

	params[1].value.ll = alIntToFixed (instance->sample_rate);

	if (alSetParams (alGetResource (instance->port), params, 2) < 0) {

	    fprintf (stderr, "alSetParams failed\n");

	    return 1;

	}

	instance->flags = flags;

	instance->set_params = 0;

    } else if ((flags == A52_DOLBY) && (instance->flags == A52_STEREO)) {

	fprintf (stderr, "Switching from stereo to dolby surround\n");

	instance->flags = A52_DOLBY;

    } else if ((flags == A52_STEREO) && (instance->flags == A52_DOLBY)) {

	fprintf (stderr, "Switching from dolby surround to stereo\n");

	instance->flags = A52_STEREO;

    } else if (flags != instance->flags)

	return 1;

    float2s16_multi (samples, int16_samples, flags);

    alWriteFrames (instance->port, int16_samples, 256);

    return 0;

}

static void al_close (ao_instance_t * _instance)

{

    al_instance_t * instance = (al_instance_t *) _instance;

    alClosePort (instance->port);

}

static ao_instance_t * al_open (int flags)

{

    al_instance_t * instance;

    int format;

    instance = malloc (sizeof (al_instance_t));

    if (instance == NULL)

	return NULL;

    instance->ao.setup = al_setup;

    instance->ao.play = al_play;

    instance->ao.close = al_close;

    instance->sample_rate = 0;

    instance->set_params = 1;

    instance->flags = flags;

    instance->port = alOpenPort ("a52dec", "w", 0);

    if (instance->port < 0) {

	fprintf (stderr, "alOpenPort failed\n");

	free (instance);

	return NULL;

    }

    return (ao_instance_t *) instance;

}

ao_instance_t * ao_al_open (void)

{

    return al_open (A52_STEREO);

}

ao_instance_t * ao_aldolby_open (void)

{

    return al_open (A52_DOLBY);

}

ao_instance_t * ao_al4_open (void)

{

    return al_open (A52_2F2R);

}

ao_instance_t * ao_al6_open (void)

{

    return al_open (A52_3F2R | A52_LFE);

}

#endif