/*

SDL - Simple DirectMedia Layer

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

*/

/*

MiNT audio driver

using XBIOS functions (MacSound compatible driver)

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 "SDL_mintaudio.h"

#include "SDL_mintaudio_mcsn.h"

/*--- Defines ---*/

#define MINT_AUDIO_DRIVER_NAME "mint_mcsn"

/* Debug print info */

#define DEBUG_NAME "audio:mcsn: "

#define DEBUG_PRINT(what) \

{ \

printf what; \

}

#else

#define DEBUG_PRINT(what)

#endif

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

static unsigned long cookie_snd = 0;

static unsigned long cookie_mch = 0;

static cookie_mcsn_t *cookie_mcsn = NULL;

/* We can't use XBIOS in interrupt with Magic, don't know about thread */

if (Getcookie(C_MagX, &dummy) == C_FOUND) {

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 16 bits audio */

if ((cookie_snd & SND_16BIT) == 0) {

DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));

return (0);

}

/* Cookie MCSN present ? */

if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {

DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));

return (0);

}

/* Check if interrupt at end of replay */

if (cookie_mcsn->pint == 0) {

DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));

return (0);

}

/* Check if audio is lockable */

if (Locksnd() != 1) {

DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));

return (0);

}

DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));

return (1);

}

/* Stop replay */

Buffoper(0);

}

/* Restart replay */

Buffoper(SB_PLA_ENA | SB_PLA_RPT);

}

if (this->hidden != NULL) {

/* Stop replay */

SDL_MintAudio_WaitThread();

Buffoper(0);

if (!SDL_MintAudio_mint_present) {

/* Uninstall interrupt */

Jdisint(MFP_DMASOUND);

}

/* Wait if currently playing sound */

while (SDL_MintAudio_mutex != 0) {}

/* Clear buffers */

if (SDL_MintAudio_audiobuf[0]) {

Mfree(SDL_MintAudio_audiobuf[0]);

SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;

}

/* Unlock sound system */

Unlocksnd();

SDL_free(this->hidden);

this->hidden = NULL;

}

}

int i;

unsigned long masterclock, masterprediv;

SDL_AUDIO_BITSIZE(this->spec.format)));

DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));

DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));

DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));

DEBUG_PRINT(("channels=%d, ", this->spec.channels));

DEBUG_PRINT(("freq=%d\n", this->spec.freq));

if (this->spec.channels > 2) {

this->spec.channels = 2; /* no more than stereo! */

}

/* Check formats available */

MINTAUDIO_freqcount = 0;

switch (cookie_mcsn->play) {

case MCSN_ST:

this->spec.channels = 1;

this->spec.format = AUDIO_S8; /* FIXME: is it signed or unsigned ? */

SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);

break;

case MCSN_TT: /* Also STE, Mega STE */

masterclock = MASTERCLOCK_STE;

masterprediv = MASTERPREDIV_STE;

if ((cookie_mch >> 16) == MCH_TT) {

masterclock = MASTERCLOCK_TT;

masterprediv = MASTERPREDIV_TT;

}

for (i = 0; i < 4; i++) {

SDL_MintAudio_AddFrequency(this,

masterclock / (masterprediv *

(1 << i)),

masterclock, 3 - i, -1);

}

break;

case MCSN_FALCON: /* Also Mac */

for (i = 1; i < 12; i++) {

/* Remove unusable Falcon codec predivisors */

if ((i == 6) || (i == 8) || (i == 10)) {

continue;

}

SDL_MintAudio_AddFrequency(this,

MASTERCLOCK_FALCON1 /

(MASTERPREDIV_FALCON * (i + 1)),

CLK25M, i + 1, -1);

}

if (cookie_mcsn->res1 != 0) {

for (i = 1; i < 4; i++) {

SDL_MintAudio_AddFrequency(this,

(cookie_mcsn->res1) /

(MASTERPREDIV_FALCON *

(1 << i)), CLKEXT,

(1 << i) - 1, -1);

}

}

this->spec.format |= SDL_AUDIO_MASK_SIGNED; /* Audio is always signed */

if ((SDL_AUDIO_BITSIZE(this->spec.format)) == 16) {

this->spec.format |= SDL_AUDIO_MASK_ENDIAN; /* Audio is always big endian */

this->spec.channels = 2; /* 16 bits always stereo */

}

break;

}

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, this->spec.freq);

this->spec.freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;

SDL_AUDIO_BITSIZE(this->spec.format)));

DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(this->spec.format)));

DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(this->spec.format)));

DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(this->spec.format)));

DEBUG_PRINT(("channels=%d, ", this->spec.channels));

DEBUG_PRINT(("freq=%d\n", this->spec.freq));

}

int channels_mode, prediv, dmaclock;

void *buffer;

/* Stop currently playing sound */

SDL_MintAudio_quit_thread = SDL_FALSE;

SDL_MintAudio_thread_finished = SDL_TRUE;

SDL_MintAudio_WaitThread();

Buffoper(0);

/* Set replay tracks */

Settracks(0, 0);

Setmontracks(0);

/* Select replay format */

channels_mode = STEREO16;

channels_mode = STEREO8;

} else {

channels_mode = MONO8;

}

break;

}

if (Setmode(channels_mode) < 0) {

DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));

}

dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;

prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;

switch (cookie_mcsn->play) {

case MCSN_TT:

Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);

Soundcmd(SETPRESCALE, prediv);

DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));

break;

case MCSN_FALCON:

Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);

DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));

break;

}

/* Set buffer */

buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];

DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));

}

if (SDL_MintAudio_mint_present) {

SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);

} else {

/* Install interrupt */

Jdisint(MFP_DMASOUND);

Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);

Jenabint(MFP_DMASOUND);

if (Setinterrupt(SI_TIMERA, SI_PLAY) < 0) {

DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));

}

}

/* Go */

Buffoper(SB_PLA_ENA | SB_PLA_RPT);

DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));

}

/* Lock sound system */

if (Locksnd() != 1) {

SDL_SetError("MINTMCSN_OpenDevice: Audio system already in use");

return 0;

if (MINTMCSN_CheckAudio(this) == -1) {

return 0;

/* Initialize all variables that we clean on shutdown */

this->hidden = (struct SDL_PrivateAudioData *)

SDL_malloc((sizeof *this->hidden));

if (this->hidden == NULL) {

SDL_OutOfMemory();

return 0;

}

SDL_memset(this->hidden, 0, (sizeof *this->hidden));

SDL_CalculateAudioSpec(&this->spec);

SDL_free(this->hidden);

this->hidden = NULL;

SDL_OutOfMemory();

return 0;

SDL_memset(SDL_MintAudio_audiobuf[0],this->spec.silence,this->spec.size*2);

SDL_MintAudio_audiosize = this->spec.size;

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();

static int

MINTMCSN_Init(SDL_AudioDriverImpl *impl)

{

/* Set the function pointers */

impl->OpenDevice = MINTMCSN_OpenDevice;

impl->CloseDevice = MINTMCSN_CloseDevice;

impl->LockAudio = MINTMCSN_LockAudio;

impl->UnlockAudio = MINTMCSN_UnlockAudio;

impl->OnlyHasDefaultOutputDevice = 1;

impl->ProvidesOwnCallbackThread = 1;

impl->SkipMixerLock = 1;

return 1;

}

AudioBootStrap MINTAUDIO_MCSN_bootstrap = {

MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",

MINTMCSN_Available, MINTMCSN_Init, 0

};