/*

    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 XBIOS functions (MacSound compatible driver)

	Patrice Mandin

*/

#include <support.h>

/* 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_mcsn.h"

/*--- Defines ---*/

#define MINT_AUDIO_DRIVER_NAME "mint_mcsn"

/* Debug print info */

#define DEBUG_NAME "audio:mcsn: "

#if 0

#define DEBUG_PRINT(what) \

	{ \

		printf what; \

	}

#else

#define DEBUG_PRINT(what)

#endif

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

static unsigned long cookie_snd, cookie_mch;

static cookie_mcsn_t *cookie_mcsn;

/*--- 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)

{

	unsigned long dummy;

	const char *envr = SDL_getenv("SDL_AUDIODRIVER");

	SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);

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

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

		return(0);

	}

	/* 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 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);

	}

	Unlocksnd();

	DEBUG_PRINT((DEBUG_NAME "MCSN 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_MCSN_bootstrap = {

	MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",

	Audio_Available, Audio_CreateDevice

};

static void Mint_LockAudio(_THIS)

{

	/* Stop replay */

	Buffoper(0);

}

static void Mint_UnlockAudio(_THIS)

{

	/* Restart replay */

	Buffoper(SB_PLA_ENA|SB_PLA_RPT);

}

static void Mint_CloseAudio(_THIS)

{

	/* 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();

}

static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)

{

	int i;

	unsigned long masterclock, masterprediv;

	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;  /* no more than stereo! */

    }

	/* Check formats available */

	MINTAUDIO_freqcount=0;

	switch(cookie_mcsn->play) {

		case MCSN_ST:

			spec->channels=1;

			spec->format=8; /* FIXME: is it signed or unsigned ? */

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

			break;

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

			spec->format=AUDIO_S8;

			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);

				}

			}

			spec->format |= 0x8000;	/* Audio is always signed */

			if ((spec->format & 0x00ff)==16) {

				spec->format |= 0x1000;	/* Audio is always big endian */

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

			}

			break;

	}

#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)

{

	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;

	switch (spec->format & 0xff) {

		case 8:

			if (spec->channels==2) {

				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];

	if (Setbuffer(0, buffer, buffer + spec->size)<0) {

		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"));

}

static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)

{

	/* Lock sound system */

	if (Locksnd()!=1) {

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

        return(-1);

	}

	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 SDL threaded audio */

}