Source to src/sd-alsa/sound.h

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 /*
  * UAE - The Un*x Amiga Emulator
  *
  * Support for Linux/ALSA sound
  *
  * Copyright 1997 Bernd Schmidt
  * Copyright 2004 Heikki Orsila
  */

#include <alsa/asoundlib.h>

extern uae_u16 *sndbufpt, *sndbuf_base;
extern int sndbufsize;

extern void finish_sound_buffers (void);

static int check_sound_buffers (void)
{
    if ((char *) sndbufpt - (char *) sndbuf_base >= sndbufsize) {
	finish_sound_buffers ();
	return 1;
    }
    return 0;
}

#define PUT_SOUND_BYTE(b) do { *(uae_u8 *)sndbufpt = b; sndbufpt = (uae_u16 *)(((uae_u8 *)sndbufpt) + 1); } while (0)
#define PUT_SOUND_WORD(b) do { *(uae_u16 *)sndbufpt = b; sndbufpt = (uae_u16 *)(((uae_u8 *)sndbufpt) + 2); } while (0)
#define PUT_SOUND_BYTE_LEFT(b) PUT_SOUND_BYTE(b)
#define PUT_SOUND_WORD_LEFT(b) PUT_SOUND_WORD(b)
#define PUT_SOUND_BYTE_RIGHT(b) PUT_SOUND_BYTE(b)
#define PUT_SOUND_WORD_RIGHT(b) PUT_SOUND_WORD(b)
#define SOUND16_BASE_VAL 0
#define SOUND8_BASE_VAL 128

#define DEFAULT_SOUND_MAXB 2048
#define DEFAULT_SOUND_MINB 2048
#define DEFAULT_SOUND_BITS 16
#define DEFAULT_SOUND_FREQ 44100