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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 1.3 2001-11-06 17:01:07 simons 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