Logo Search packages:      
Sourcecode: sarien version File versions  Download package

sound_bsd.c

/*  Sarien - A Sierra AGI resource interpreter engine
 *  Copyright (C) 1999,2001 Stuart George and Claudio Matsuoka
 *  
 *  $Id: sound_bsd.c,v 1.3 2001/06/22 14:45:04 cmatsuoka Exp $
 *
 *  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; see docs/COPYING for further details.
 */

/*
 * BSD sound driver by Claudio Matsuoka <claudio@helllabs.org>
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>

#include "typedef.h"
#include "sound.h"

static int bsd_init_sound (SINT16 *);
static void bsd_close_sound (void);
static void dump_buffer (void);
static SINT16 *buffer;

static struct sound_driver sound_bsd = {
      "BSD /dev/audio sound output",
      bsd_init_sound,
      bsd_close_sound,
};

static int audio_fd;


#include <pthread.h>

static pthread_t thread;


static void *sound_thread (void *arg)
{
      while (42) {
            play_sound ();
            mix_sound ();
            dump_buffer ();
      }
}


void __init_sound ()
{
      snd = &sound_bsd;
}


static int bsd_init_sound (SINT16 *b)
{
      audio_info_t ainfo;

      buffer = b;

      if ((audio_fd = open ("/dev/audio", O_WRONLY)) < 0)
            return err_Unk;

      AUDIO_INITINFO (&ainfo);
      ainfo.play.sample_rate = 22050;
      ainfo.play.channels = 1;
      ainfo.play.precision = 16;
      ainfo.play.encoding = AUDIO_ENCODING_LINEAR;
      ainfo.play.buffer_size = 16384;

      if (ioctl (audio_fd, AUDIO_SETINFO, &ainfo) == -1)
            return err_Unk;

      report ("BSD sound driver written by claudio@helllabs.org.\n");

      /* Set sound device to 16 bit, 22 kHz mono */

      pthread_create (&thread, NULL, sound_thread, NULL);
      pthread_detach (thread);

      return err_OK;
}


static void bsd_close_sound ()
{
      close (audio_fd);
}


static void dump_buffer ()
{
      int i = BUFFER_SIZE << 1, j;
      SINT16 *b = buffer;

      do {
            if ((j = write (audio_fd, b, i)) > 0) {
                  i -= j;
                  b += j;
            }
      } while (i);
}


Generated by  Doxygen 1.6.0   Back to index