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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_oss.c,v 1.1 2002-03-28 20:38:50 lampret Exp $
 */
 
# ifdef HAVE_CONFIG_H
#  include "config.h"
# endif
 
#ifndef EMBED
# include <unistd.h>
# include <fcntl.h>
# include <sys/ioctl.h>
# include <sys/soundcard.h>
# include <errno.h>
 
# include "mad.h"
# include "audio.h"
 
# if !defined(AFMT_S32_NE)
#  if defined(WORDS_BIGENDIAN)
#   define AFMT_S32_NE  AFMT_S32_BE
#  else
#   define AFMT_S32_NE  AFMT_S32_LE
#  endif
# endif
 
# if !defined(AFMT_S16_NE)
#  if defined(WORDS_BIGENDIAN)
#   define AFMT_S16_NE  AFMT_S16_BE
#  else
#   define AFMT_S16_NE  AFMT_S16_LE
#  endif
# endif
 
# if !defined(SNDCTL_DSP_CHANNELS) && defined(SOUND_PCM_WRITE_CHANNELS)
#  define SNDCTL_DSP_CHANNELS	SOUND_PCM_WRITE_CHANNELS
# endif
 
# define AUDIO_DEVICE	"/dev/dsp"
 
static int sfd;
static unsigned int (*audio_pcm)(unsigned char *, unsigned int,
				 mad_fixed_t const *, mad_fixed_t const *);
inline static
int init(struct audio_init *init)
{
  if (init->path == 0)
    init->path = AUDIO_DEVICE;
 
  sfd = open(init->path, O_WRONLY);
  if (sfd == -1) {
    audio_error = ":";
    return -1;
  }
 
  return 0;
}
 
inline static
int config(struct audio_config *config)
{
  int format;
 
  if (ioctl(sfd, SNDCTL_DSP_SYNC, 0) == -1) {
    audio_error = ":ioctl(SNDCTL_DSP_SYNC)";
    return -1;
  }
 
  format = AFMT_S16_NE;
 
  if (ioctl(sfd, SNDCTL_DSP_SETFMT, &format) == -1) {
    audio_error = ":ioctl(SNDCTL_DSP_SETFMT)";
    return -1;
  }
 
  audio_pcm = audio_pcm_s16le;
 
  if (ioctl(sfd, SNDCTL_DSP_CHANNELS, &config->channels) == -1) {
    audio_error = ":ioctl(SNDCTL_DSP_CHANNELS)";
    return -1;
  }
 
  if (ioctl(sfd, SNDCTL_DSP_SPEED, &config->speed) == -1) {
    audio_error = ":ioctl(SNDCTL_DSP_SPEED)";
    return -1;
  }
 
  return 0;
}
 
inline
int output_s(unsigned char const *ptr, unsigned int len)
{
  while (len) {
    int wrote;
 
    wrote = write(sfd, ptr, len);
    if (wrote == -1) {
      if (errno == EINTR) {
	printf(".");
	continue;
      }
      else {
	audio_error = ":write";
	return -1;
      }
    }
 
    ptr += wrote;
    len -= wrote;
  }
 
  return 0;
}
 
inline static
int finish(struct audio_finish *finish)
{
  int result = 0;
 
  if (close(sfd) == -1 && result == 0) {
    audio_error = ":close";
    result = -1;
  }
 
  return result;
}
 
inline int audio_oss(union audio_control *control)
{
  audio_error = 0;
 
  switch (control->command) {
  case AUDIO_COMMAND_INIT:
    return init(&control->init);
 
  case AUDIO_COMMAND_CONFIG:
    return config(&control->config);
 
  case AUDIO_COMMAND_FINISH:
    return finish(&control->finish);
  }
 
  return 0;
}
#endif