distrib/sdl-1.2.12/src/audio/mint/SDL_mintaudio_dma8.c - platform/external/qemu - Gitiles

 /*
     SDL - Simple DirectMedia Layer
     Copyright (C) 1997-2004 Sam Lantinga

     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.

     This library 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
     Library General Public License for more details.

     You should have received a copy of the GNU Library General Public
     License along with this library; if not, write to the Free
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

     Sam Lantinga
     slouken@libsdl.org
 */
 #include "SDL_config.h"

 /*
 	MiNT audio driver
 	using DMA 8bits (hardware access)

 	Patrice Mandin
 */

 /* Mint includes */
 #include <mint/osbind.h>
 #include <mint/falcon.h>
 #include <mint/cookie.h>

 #include "SDL_audio.h"
 #include "../SDL_audio_c.h"
 #include "../SDL_sysaudio.h"

 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"

 #include "SDL_mintaudio.h"
 #include "SDL_mintaudio_dma8.h"

 /*--- Defines ---*/

 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"

 /* Debug print info */
 #define DEBUG_NAME "audio:dma8: "
 #if 0
 #define DEBUG_PRINT(what) \
 	{ \
 		printf what; \
 	}
 #else
 #define DEBUG_PRINT(what)
 #endif

 /*--- Static variables ---*/

 static unsigned long cookie_snd, cookie_mch;

 /*--- Audio driver functions ---*/

 static void Mint_CloseAudio(_THIS);
 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
 static void Mint_LockAudio(_THIS);
 static void Mint_UnlockAudio(_THIS);

 /* To check/init hardware audio */
 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);

 /*--- Audio driver bootstrap functions ---*/

 static int Audio_Available(void)
 {
 	const char *envr = SDL_getenv("SDL_AUDIODRIVER");

 	/* Check if user asked a different audio driver */
 	if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
 		DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
 		return 0;
 	}

 	/* Cookie _MCH present ? if not, assume ST machine */
 	if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
 		cookie_mch = MCH_ST;
 	}

 	/* Cookie _SND present ? if not, assume ST machine */
 	if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
 		cookie_snd = SND_PSG;
 	}

 	/* Check if we have 8 bits audio */
 	if ((cookie_snd & SND_8BIT)==0) {
 		DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
 	    return(0);
 	}

 	/* Check if audio is lockable */
 	if (cookie_snd & SND_16BIT) {
 		if (Locksnd()!=1) {
 			DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
 			return(0);
 		}

 		Unlocksnd();
 	}

 	DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
 	return(1);
 }

 static void Audio_DeleteDevice(SDL_AudioDevice *device)
 {
     SDL_free(device->hidden);
     SDL_free(device);
 }

 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
 {
 	SDL_AudioDevice *this;

 	/* Initialize all variables that we clean on shutdown */
 	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
     if ( this ) {
         SDL_memset(this, 0, (sizeof *this));
         this->hidden = (struct SDL_PrivateAudioData *)
                 SDL_malloc((sizeof *this->hidden));
     }
     if ( (this == NULL) || (this->hidden == NULL) ) {
         SDL_OutOfMemory();
         if ( this ) {
             SDL_free(this);
         }
         return(0);
     }
     SDL_memset(this->hidden, 0, (sizeof *this->hidden));

     /* Set the function pointers */
     this->OpenAudio   = Mint_OpenAudio;
     this->CloseAudio  = Mint_CloseAudio;
     this->LockAudio   = Mint_LockAudio;
     this->UnlockAudio = Mint_UnlockAudio;
     this->free        = Audio_DeleteDevice;

     return this;
 }

 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
 	MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
 	Audio_Available, Audio_CreateDevice
 };

 static void Mint_LockAudio(_THIS)
 {
 	void *oldpile;

 	/* Stop replay */
 	oldpile=(void *)Super(0);
 	DMAAUDIO_IO.control=0;
 	Super(oldpile);
 }

 static void Mint_UnlockAudio(_THIS)
 {
 	void *oldpile;

 	/* Restart replay */
 	oldpile=(void *)Super(0);
 	DMAAUDIO_IO.control=3;
 	Super(oldpile);
 }

 static void Mint_CloseAudio(_THIS)
 {
 	void *oldpile;

 	/* Stop replay */
 	oldpile=(void *)Super(0);
 	DMAAUDIO_IO.control=0;
 	Super(oldpile);

 	DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));

 	/* Disable interrupt */
 	Jdisint(MFP_DMASOUND);

 	DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));

 	/* Wait if currently playing sound */
 	while (SDL_MintAudio_mutex != 0) {
 	}

 	DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));

 	/* Clear buffers */
 	if (SDL_MintAudio_audiobuf[0]) {
 		Mfree(SDL_MintAudio_audiobuf[0]);
 		SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
 	}

 	DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
 }

 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
 {
 	int i, masterprediv, sfreq;
 	unsigned long masterclock;

 	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
 	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
 	DEBUG_PRINT(("channels=%d, ", spec->channels));
 	DEBUG_PRINT(("freq=%d\n", spec->freq));

 	if (spec->channels > 2)
 		spec->channels = 2;

 	/* Check formats available */
 	spec->format = AUDIO_S8;

 	/* Calculate and select the closest frequency */
 	sfreq=0;
 	masterclock=MASTERCLOCK_STE;
 	masterprediv=MASTERPREDIV_STE;
 	switch(cookie_mch>>16) {
 /*
 		case MCH_STE:
 			masterclock=MASTERCLOCK_STE;
 			masterprediv=MASTERPREDIV_STE;
 			break;
 */
 		case MCH_TT:
 			masterclock=MASTERCLOCK_TT;
 			masterprediv=MASTERPREDIV_TT;
 			break;
 		case MCH_F30:
 		case MCH_ARANYM:
 			masterclock=MASTERCLOCK_FALCON1;
 			masterprediv=MASTERPREDIV_FALCON;
 			sfreq=1;
 			break;
 	}

 	MINTAUDIO_freqcount=0;
 	for (i=sfreq;i<4;i++) {
 		SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
 			masterclock, i-sfreq, -1);
 	}

 #if 1
 	for (i=0; i<MINTAUDIO_freqcount; i++) {
 		DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
 			i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
 			MINTAUDIO_frequencies[i].predivisor
 		));
 	}
 #endif

 	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
 	spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;

 	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
 	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
 	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
 	DEBUG_PRINT(("channels=%d, ", spec->channels));
 	DEBUG_PRINT(("freq=%d\n", spec->freq));

 	return 0;
 }

 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
 {
 	void *oldpile;
 	unsigned long buffer;
 	unsigned char mode;

 	/* Set replay tracks */
 	if (cookie_snd & SND_16BIT) {
 		Settracks(0,0);
 		Setmontracks(0);
 	}

 	oldpile=(void *)Super(0);

 	/* Stop currently playing sound */
 	DMAAUDIO_IO.control=0;

 	/* Set buffer */
 	buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
 	DMAAUDIO_IO.start_high = (buffer>>16) & 255;
 	DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
 	DMAAUDIO_IO.start_low = buffer & 255;

 	buffer += SDL_MintAudio_audiosize;
 	DMAAUDIO_IO.end_high = (buffer>>16) & 255;
 	DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
 	DMAAUDIO_IO.end_low = buffer & 255;

 	mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
 	if (spec->channels==1) {
 		mode |= 1<<7;
 	}
 	DMAAUDIO_IO.sound_ctrl = mode;

 	/* Set interrupt */
 	Jdisint(MFP_DMASOUND);
 	Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
 	Jenabint(MFP_DMASOUND);

 	if (cookie_snd & SND_16BIT) {
 		if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
 			DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
 		}
 	}

 	/* Go */
 	DMAAUDIO_IO.control = 3;	/* playback + repeat */

 	Super(oldpile);
 }

 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
 {
 	SDL_MintAudio_device = this;

 	/* Check audio capabilities */
 	if (Mint_CheckAudio(this, spec)==-1) {
 		return -1;
 	}

 	SDL_CalculateAudioSpec(spec);

 	/* Allocate memory for audio buffers in DMA-able RAM */
 	DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));

 	SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
 	if (SDL_MintAudio_audiobuf[0]==NULL) {
 		SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
 		return (-1);
 	}
 	SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
 	SDL_MintAudio_numbuf=0;
 	SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
 	SDL_MintAudio_audiosize = spec->size;
 	SDL_MintAudio_mutex = 0;

 	DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
 	DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));

 	SDL_MintAudio_CheckFpu();

 	/* Setup audio hardware */
 	Mint_InitAudio(this, spec);

     return(1);	/* We don't use threaded audio */
 }
	/*
	SDL - Simple DirectMedia Layer
	Copyright (C) 1997-2004 Sam Lantinga

	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Library General Public
	License as published by the Free Software Foundation; either
	version 2 of the License, or (at your option) any later version.

	This library 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
	Library General Public License for more details.

	You should have received a copy of the GNU Library General Public
	License along with this library; if not, write to the Free
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

	Sam Lantinga
	slouken@libsdl.org
	*/
	#include "SDL_config.h"

	/*
	MiNT audio driver
	using DMA 8bits (hardware access)

	Patrice Mandin
	*/

	/* Mint includes */
	#include <mint/osbind.h>
	#include <mint/falcon.h>
	#include <mint/cookie.h>

	#include "SDL_audio.h"
	#include "../SDL_audio_c.h"
	#include "../SDL_sysaudio.h"

	#include "../../video/ataricommon/SDL_atarimxalloc_c.h"

	#include "SDL_mintaudio.h"
	#include "SDL_mintaudio_dma8.h"

	/--- Defines ---/

	#define MINT_AUDIO_DRIVER_NAME "mint_dma8"

	/* Debug print info */
	#define DEBUG_NAME "audio:dma8: "
	#if 0
	#define DEBUG_PRINT(what) \
	{ \
	printf what; \
	}
	#else
	#define DEBUG_PRINT(what)
	#endif

	/--- Static variables ---/

	static unsigned long cookie_snd, cookie_mch;

	/--- Audio driver functions ---/

	static void Mint_CloseAudio(_THIS);
	static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
	static void Mint_LockAudio(_THIS);
	static void Mint_UnlockAudio(_THIS);

	/* To check/init hardware audio */
	static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
	static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);

	/--- Audio driver bootstrap functions ---/

	static int Audio_Available(void)
	{
	const char *envr = SDL_getenv("SDL_AUDIODRIVER");

	/* Check if user asked a different audio driver */
	if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
	DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
	return 0;
	}

	/* Cookie _MCH present ? if not, assume ST machine */
	if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
	cookie_mch = MCH_ST;
	}

	/* Cookie _SND present ? if not, assume ST machine */
	if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
	cookie_snd = SND_PSG;
	}

	/* Check if we have 8 bits audio */
	if ((cookie_snd & SND_8BIT)==0) {
	DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
	return(0);
	}

	/* Check if audio is lockable */
	if (cookie_snd & SND_16BIT) {
	if (Locksnd()!=1) {
	DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
	return(0);
	}

	Unlocksnd();
	}

	DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
	return(1);
	}

	static void Audio_DeleteDevice(SDL_AudioDevice *device)
	{
	SDL_free(device->hidden);
	SDL_free(device);
	}

	static SDL_AudioDevice *Audio_CreateDevice(int devindex)
	{
	SDL_AudioDevice *this;

	/* Initialize all variables that we clean on shutdown */
	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
	if ( this ) {
	SDL_memset(this, 0, (sizeof *this));
	this->hidden = (struct SDL_PrivateAudioData *)
	SDL_malloc((sizeof *this->hidden));
	}
	if ( (this == NULL) \|\| (this->hidden == NULL) ) {
	SDL_OutOfMemory();
	if ( this ) {
	SDL_free(this);
	}
	return(0);
	}
	SDL_memset(this->hidden, 0, (sizeof *this->hidden));

	/* Set the function pointers */
	this->OpenAudio = Mint_OpenAudio;
	this->CloseAudio = Mint_CloseAudio;
	this->LockAudio = Mint_LockAudio;
	this->UnlockAudio = Mint_UnlockAudio;
	this->free = Audio_DeleteDevice;

	return this;
	}

	AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
	MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
	Audio_Available, Audio_CreateDevice
	};

	static void Mint_LockAudio(_THIS)
	{
	void *oldpile;

	/* Stop replay */
	oldpile=(void *)Super(0);
	DMAAUDIO_IO.control=0;
	Super(oldpile);
	}

	static void Mint_UnlockAudio(_THIS)
	{
	void *oldpile;

	/* Restart replay */
	oldpile=(void *)Super(0);
	DMAAUDIO_IO.control=3;
	Super(oldpile);
	}

	static void Mint_CloseAudio(_THIS)
	{
	void *oldpile;

	/* Stop replay */
	oldpile=(void *)Super(0);
	DMAAUDIO_IO.control=0;
	Super(oldpile);

	DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));

	/* Disable interrupt */
	Jdisint(MFP_DMASOUND);

	DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));

	/* Wait if currently playing sound */
	while (SDL_MintAudio_mutex != 0) {
	}

	DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));

	/* Clear buffers */
	if (SDL_MintAudio_audiobuf[0]) {
	Mfree(SDL_MintAudio_audiobuf[0]);
	SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
	}

	DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
	}

	static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
	{
	int i, masterprediv, sfreq;
	unsigned long masterclock;

	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
	DEBUG_PRINT(("channels=%d, ", spec->channels));
	DEBUG_PRINT(("freq=%d\n", spec->freq));

	if (spec->channels > 2)
	spec->channels = 2;

	/* Check formats available */
	spec->format = AUDIO_S8;

	/* Calculate and select the closest frequency */
	sfreq=0;
	masterclock=MASTERCLOCK_STE;
	masterprediv=MASTERPREDIV_STE;
	switch(cookie_mch>>16) {
	/*
	case MCH_STE:
	masterclock=MASTERCLOCK_STE;
	masterprediv=MASTERPREDIV_STE;
	break;
	*/
	case MCH_TT:
	masterclock=MASTERCLOCK_TT;
	masterprediv=MASTERPREDIV_TT;
	break;
	case MCH_F30:
	case MCH_ARANYM:
	masterclock=MASTERCLOCK_FALCON1;
	masterprediv=MASTERPREDIV_FALCON;
	sfreq=1;
	break;
	}

	MINTAUDIO_freqcount=0;
	for (i=sfreq;i<4;i++) {
	SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
	masterclock, i-sfreq, -1);
	}

	#if 1
	for (i=0; i<MINTAUDIO_freqcount; i++) {
	DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
	i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
	MINTAUDIO_frequencies[i].predivisor
	));
	}
	#endif

	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
	spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;

	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
	DEBUG_PRINT(("channels=%d, ", spec->channels));
	DEBUG_PRINT(("freq=%d\n", spec->freq));

	return 0;
	}

	static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
	{
	void *oldpile;
	unsigned long buffer;
	unsigned char mode;

	/* Set replay tracks */
	if (cookie_snd & SND_16BIT) {
	Settracks(0,0);
	Setmontracks(0);
	}

	oldpile=(void *)Super(0);

	/* Stop currently playing sound */
	DMAAUDIO_IO.control=0;

	/* Set buffer */
	buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
	DMAAUDIO_IO.start_high = (buffer>>16) & 255;
	DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
	DMAAUDIO_IO.start_low = buffer & 255;

	buffer += SDL_MintAudio_audiosize;
	DMAAUDIO_IO.end_high = (buffer>>16) & 255;
	DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
	DMAAUDIO_IO.end_low = buffer & 255;

	mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
	if (spec->channels==1) {
	mode \|= 1<<7;
	}
	DMAAUDIO_IO.sound_ctrl = mode;

	/* Set interrupt */
	Jdisint(MFP_DMASOUND);
	Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
	Jenabint(MFP_DMASOUND);

	if (cookie_snd & SND_16BIT) {
	if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
	DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
	}
	}

	/* Go */
	DMAAUDIO_IO.control = 3; /* playback + repeat */

	Super(oldpile);
	}

	static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
	{
	SDL_MintAudio_device = this;

	/* Check audio capabilities */
	if (Mint_CheckAudio(this, spec)==-1) {
	return -1;
	}

	SDL_CalculateAudioSpec(spec);

	/* Allocate memory for audio buffers in DMA-able RAM */
	DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));

	SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
	if (SDL_MintAudio_audiobuf[0]==NULL) {
	SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
	return (-1);
	}
	SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
	SDL_MintAudio_numbuf=0;
	SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
	SDL_MintAudio_audiosize = spec->size;
	SDL_MintAudio_mutex = 0;

	DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
	DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));

	SDL_MintAudio_CheckFpu();

	/* Setup audio hardware */
	Mint_InitAudio(this, spec);

	return(1); /* We don't use threaded audio */
	}