/*

Name:
drv_aix.c

Description:
Mikmod driver for output to AIX series audio device

Portability:

AIX >= 3.25 with appropriate audio hardware.

Written by Lutz Vieweg <lkv@mania.robin.de>
based on drv_raw.c

Feel free to distribute just as you like.
No warranties at all.

*/

#include <stdio.h>
#include <stdlib.h>

#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/audio.h>

#include "mikmod.h"

struct _track_info
{
        unsigned short master_volume;
        unsigned short dither_percent;
        unsigned short reserved[3];
} t_info;
audio_init a_init;
audio_control a_control;
audio_change a_change;


static int fd;
#define RAWBUFFERSIZE 32768
static char RAW_DMABUF[RAWBUFFERSIZE];

static BOOL AIX_IsThere(void)
{
	return 1;
}

static BOOL AIX_Init(void)
{
	float volume = (float)1.0;
	int flags;
	
	if (! (md_mode & DMODE_16BITS)) {
		myerr = "sorry, this driver supports 16-bit linear output only";
		return 0;
	}
	
   if ((fd = open ("/dev/acpa0/1", O_WRONLY)) < 3)
     if ((fd = open ("/dev/paud0/1", O_WRONLY)) < 3)
       if ((fd = open ("/dev/baud0/1", O_WRONLY)) < 3)
       {
         myerr = "unable to open audio-device";
         return 0;
       }
	
	
  t_info.master_volume=0x7fff;
  t_info.dither_percent=0;
	
  a_init.srate=md_mixfreq;
  a_init.bits_per_sample=16;
  a_init.channels=(md_mode & DMODE_STEREO)? 2 : 1;
  a_init.mode=PCM;
  a_init.flags=FIXED | BIG_ENDIAN | TWOS_COMPLEMENT;
  a_init.operation=PLAY;
	
  a_change.balance=0x3fff0000;
  a_change.balance_delay=0;
  a_change.volume=(long)(volume * (float)0x7FFFFFFF);
  a_change.volume_delay=0;
  a_change.monitor=AUDIO_IGNORE;
  a_change.input=AUDIO_IGNORE;
  a_change.output=OUTPUT_1;
  a_change.dev_info=&t_info;

  a_control.ioctl_request=AUDIO_CHANGE;
  a_control.position=0;
  a_control.request_info=&a_change;

  if (ioctl(fd, AUDIO_INIT, &a_init) == -1 )
  {
    myerr = "configuration (init) of audio device failed";
    return 0;
  }
  if (ioctl(fd, AUDIO_CONTROL, &a_control) == -1 )
  {
    myerr = "configuration (control) of audio device failed";
    return 0;
  }

  a_control.ioctl_request=AUDIO_START;
  a_control.request_info=NULL;
  if (ioctl(fd, AUDIO_CONTROL, &a_control) == -1 )
  {
    myerr = "configuration (start) of audio device failed";
    return 0;
  }
	
#if 0
	if ((flags = fcntl (fd, F_GETFL, 0)) < 0) {
		myerr = "unable to set non-blocking mode for /dev/audio";
		return 0;
	}
	flags |= O_NDELAY;
	if (fcntl (fd, F_SETFL, flags) < 0) {
		myerr = "unable to set non-blocking mode for /dev/audio";
		return 0;
	}
#endif
	
	if(!VC_Init()){
		close(fd);
		return 0;
	}

	return 1;
}



static void AIX_Exit(void)
{
	VC_Exit();
	close(fd);
}


static void AIX_Update(void)
{
	VC_WriteBytes(RAW_DMABUF,RAWBUFFERSIZE);
	write(fd, RAW_DMABUF, RAWBUFFERSIZE);
}


DRIVER drv_aix={
	NULL,
	"AIX audio-device",
	"MikMod AIX audio-device driver v1.10",
	AIX_IsThere,
	VC_SampleLoad,
	VC_SampleUnload,
	VC_SampleSpace,
	VC_SampleLength,
	AIX_Init,
	AIX_Exit,
	VC_SetNumChannels,
	VC_PlayStart,
	VC_PlayStop,
	AIX_Update,
	VC_VoiceSetVolume,
	VC_VoiceSetFrequency,
	VC_VoiceSetPanning,
	VC_VoicePlay,
	VC_VoiceStop,
	VC_VoiceStopped,
	VC_VoiceReleaseSustain,
	VC_VoiceGetPosition,
	VC_RealVolume
};