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/*

 * mad - MPEG audio decoder

 * Copyright (C) 2000-2001 Robert Leslie

 *

 * This program 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.

 *

 * This program 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

 *

 * $Id: audio.h,v 1.1 2002-03-28 20:38:50 lampret Exp $

 */

# ifndef AUDIO_H

# define AUDIO_H

# include "mad.h"

# define MAX_NSAMPLES   (1152 * 3)      /* allow for resampled frame */

enum audio_command {

  AUDIO_COMMAND_INIT,

  AUDIO_COMMAND_CONFIG,

  AUDIO_COMMAND_FINISH

};

enum audio_mode {

  AUDIO_MODE_ROUND  = 0x0001,

  AUDIO_MODE_DITHER = 0x0002

};

struct audio_stats {

  unsigned long clipped_samples;

  mad_fixed_t peak_clipping;

  mad_fixed_t peak_sample;

};

union audio_control {

  enum audio_command command;

  struct audio_init {

    enum audio_command command;

    char const *path;

  } init;

  struct audio_config {

    enum audio_command command;

    unsigned int channels;

    unsigned int speed;

  } config;

  struct audio_play {

    enum audio_command command;

    unsigned int nsamples;

    mad_fixed_t const *samples[2];

    enum audio_mode mode;

    struct audio_stats *stats;

  } play;

  struct audio_finish {

    enum audio_command command;

  } finish;

};

extern char const *audio_error;

typedef int audio_ctlfunc_t(union audio_control *);

audio_ctlfunc_t *audio_output(char const **);

audio_ctlfunc_t audio_oss;

audio_ctlfunc_t audio_empeg;

audio_ctlfunc_t audio_sun;

audio_ctlfunc_t audio_win32;

audio_ctlfunc_t audio_raw;

audio_ctlfunc_t audio_wave;

audio_ctlfunc_t audio_snd;

audio_ctlfunc_t audio_hex;

audio_ctlfunc_t audio_null;

signed long audio_linear_round(unsigned int, mad_fixed_t,

                               struct audio_stats *);

signed long audio_linear_dither(unsigned int, mad_fixed_t, mad_fixed_t *,

                                struct audio_stats *);

unsigned int audio_pcm_s16le(unsigned char *, unsigned int,

                             mad_fixed_t const *, mad_fixed_t const *);

unsigned char audio_mulaw_round(mad_fixed_t);

unsigned char audio_mulaw_dither(mad_fixed_t, mad_fixed_t *);

unsigned int audio_pcm_mulaw(unsigned char *, unsigned int,

                             mad_fixed_t const *, mad_fixed_t const *,

                             enum audio_mode, struct audio_stats *);

# endif