[sdl_omap.git] / src / audio / mint / SDL_mintaudio_mcsn.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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 0
	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 */
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Library General Public
	7	License as published by the Free Software Foundation; either
	8	version 2 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Library General Public License for more details.
	14
	15	You should have received a copy of the GNU Library General Public
	16	License along with this library; if not, write to the Free
	17	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18
	19	Sam Lantinga
	20	slouken@libsdl.org
	21	*/
	22	#include "SDL_config.h"
	23
	24	/*
	25	MiNT audio driver
	26	using XBIOS functions (MacSound compatible driver)
	27
	28	Patrice Mandin
	29	*/
	30
	31	#include <support.h>
	32
	33	/* Mint includes */
	34	#include <mint/osbind.h>
	35	#include <mint/falcon.h>
	36	#include <mint/cookie.h>
	37
	38	#include "SDL_audio.h"
	39	#include "../SDL_audio_c.h"
	40	#include "../SDL_sysaudio.h"
	41
	42	#include "../../video/ataricommon/SDL_atarimxalloc_c.h"
	43
	44	#include "SDL_mintaudio.h"
	45	#include "SDL_mintaudio_mcsn.h"
	46
	47	/--- Defines ---/
	48
	49	#define MINT_AUDIO_DRIVER_NAME "mint_mcsn"
	50
	51	/* Debug print info */
	52	#define DEBUG_NAME "audio:mcsn: "
	53	#if 0
	54	#define DEBUG_PRINT(what) \
	55	{ \
	56	printf what; \
	57	}
	58	#else
	59	#define DEBUG_PRINT(what)
	60	#endif
	61
	62	/--- Static variables ---/
	63
	64	static unsigned long cookie_snd, cookie_mch;
65	static cookie_mcsn_t *cookie_mcsn;
66
67	/--- Audio driver functions ---/
68
69	static void Mint_CloseAudio(_THIS);
70	static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
71	static void Mint_LockAudio(_THIS);
72	static void Mint_UnlockAudio(_THIS);
73
74	/* To check/init hardware audio */
75	static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
76	static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
77
78	/--- Audio driver bootstrap functions ---/
79
80	static int Audio_Available(void)
81	{
82	unsigned long dummy;
83	const char *envr = SDL_getenv("SDL_AUDIODRIVER");
84
85	SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
86
87	/* We can't use XBIOS in interrupt with Magic, don't know about thread */
88	if (Getcookie(C_MagX, &dummy) == C_FOUND) {
89	return(0);
90	}
91
92	/* Check if user asked a different audio driver */
93	if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
94	DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
95	return(0);
96	}
97
98	/* Cookie _MCH present ? if not, assume ST machine */
99	if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
100	cookie_mch = MCH_ST;
101	}
102
103	/* Cookie _SND present ? if not, assume ST machine */
104	if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
105	cookie_snd = SND_PSG;
106	}
107
108	/* Check if we have 16 bits audio */
109	if ((cookie_snd & SND_16BIT)==0) {
110	DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
111	return(0);
112	}
113
114	/* Cookie MCSN present ? */
115	if (Getcookie(C_McSn, (long *) &cookie_mcsn) != C_FOUND) {
116	DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
117	return(0);
118	}
119
120	/* Check if interrupt at end of replay */
121	if (cookie_mcsn->pint == 0) {
122	DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n"));
123	return(0);
124	}
125
126	/* Check if audio is lockable */
127	if (Locksnd()!=1) {
128	DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
129	return(0);
130	}
131
132	Unlocksnd();
133
134	DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n"));
135	return(1);
136	}
137
138	static void Audio_DeleteDevice(SDL_AudioDevice *device)
139	{
140	SDL_free(device->hidden);
141	SDL_free(device);
142	}
143
144	static SDL_AudioDevice *Audio_CreateDevice(int devindex)
145	{
146	SDL_AudioDevice *this;
147
148	/* Initialize all variables that we clean on shutdown */
149	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
150	if ( this ) {
151	SDL_memset(this, 0, (sizeof *this));
152	this->hidden = (struct SDL_PrivateAudioData *)
153	SDL_malloc((sizeof *this->hidden));
154	}
155	if ( (this == NULL) \|\| (this->hidden == NULL) ) {
156	SDL_OutOfMemory();
157	if ( this ) {
158	SDL_free(this);
159	}
160	return(0);
161	}
162	SDL_memset(this->hidden, 0, (sizeof *this->hidden));
163
164	/* Set the function pointers */
165	this->OpenAudio = Mint_OpenAudio;
166	this->CloseAudio = Mint_CloseAudio;
167	this->LockAudio = Mint_LockAudio;
168	this->UnlockAudio = Mint_UnlockAudio;
169	this->free = Audio_DeleteDevice;
170
171	return this;
172	}
173
174	AudioBootStrap MINTAUDIO_MCSN_bootstrap = {
175	MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver",
176	Audio_Available, Audio_CreateDevice
177	};
178
179	static void Mint_LockAudio(_THIS)
180	{
181	/* Stop replay */
182	Buffoper(0);
183	}
184
185	static void Mint_UnlockAudio(_THIS)
186	{
187	/* Restart replay */
188	Buffoper(SB_PLA_ENA\|SB_PLA_RPT);
189	}
190
191	static void Mint_CloseAudio(_THIS)
192	{
193	/* Stop replay */
194	SDL_MintAudio_WaitThread();
195	Buffoper(0);
196
197	if (!SDL_MintAudio_mint_present) {
198	/* Uninstall interrupt */
199	Jdisint(MFP_DMASOUND);
200	}
201
202	/* Wait if currently playing sound */
203	while (SDL_MintAudio_mutex != 0) {
204	}
205
206	/* Clear buffers */
207	if (SDL_MintAudio_audiobuf[0]) {
208	Mfree(SDL_MintAudio_audiobuf[0]);
209	SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
210	}
211
212	/* Unlock sound system */
213	Unlocksnd();
214	}
215
216	static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
217	{
218	int i;
219	unsigned long masterclock, masterprediv;
220
221	DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
222	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
223	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
224	DEBUG_PRINT(("channels=%d, ", spec->channels));
225	DEBUG_PRINT(("freq=%d\n", spec->freq));
226
227	if (spec->channels > 2) {
228	spec->channels = 2; /* no more than stereo! */
229	}
230
231	/* Check formats available */
232	MINTAUDIO_freqcount=0;
233	switch(cookie_mcsn->play) {
234	case MCSN_ST:
235	spec->channels=1;
236	spec->format=8; /* FIXME: is it signed or unsigned ? */
237	SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
238	break;
239	case MCSN_TT: /* Also STE, Mega STE */
240	spec->format=AUDIO_S8;
241	masterclock=MASTERCLOCK_STE;
242	masterprediv=MASTERPREDIV_STE;
243	if ((cookie_mch>>16)==MCH_TT) {
244	masterclock=MASTERCLOCK_TT;
245	masterprediv=MASTERPREDIV_TT;
246	}
247	for (i=0; i<4; i++) {
248	SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
249	masterclock, 3-i, -1);
250	}
251	break;
252	case MCSN_FALCON: /* Also Mac */
253	for (i=1; i<12; i++) {
254	/* Remove unusable Falcon codec predivisors */
255	if ((i==6) \|\| (i==8) \|\| (i==10)) {
256	continue;
257	}
258	SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
259	CLK25M, i+1, -1);
260	}
261	if (cookie_mcsn->res1 != 0) {
262	for (i=1; i<4; i++) {
263	SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
264	CLKEXT, (1<<i)-1, -1);
265	}
266	}
267	spec->format \|= 0x8000; /* Audio is always signed */
268	if ((spec->format & 0x00ff)==16) {
269	spec->format \|= 0x1000; /* Audio is always big endian */
270	spec->channels=2; /* 16 bits always stereo */
271	}
272	break;
273	}
274
275	#if 0
276	for (i=0; i<MINTAUDIO_freqcount; i++) {
277	DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
278	i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
279	MINTAUDIO_frequencies[i].predivisor
280	));
281	}
282	#endif
283
284	MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
285	spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
286
287	DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
288	DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
289	DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
290	DEBUG_PRINT(("channels=%d, ", spec->channels));
291	DEBUG_PRINT(("freq=%d\n", spec->freq));
292
293	return 0;
294	}
295
296	static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
297	{
298	int channels_mode, prediv, dmaclock;
299	void *buffer;
300
301	/* Stop currently playing sound */
302	SDL_MintAudio_quit_thread = SDL_FALSE;
303	SDL_MintAudio_thread_finished = SDL_TRUE;
304	SDL_MintAudio_WaitThread();
305	Buffoper(0);
306
307	/* Set replay tracks */
308	Settracks(0,0);
309	Setmontracks(0);
310
311	/* Select replay format */
312	channels_mode=STEREO16;
313	switch (spec->format & 0xff) {
314	case 8:
315	if (spec->channels==2) {
316	channels_mode=STEREO8;
317	} else {
318	channels_mode=MONO8;
319	}
320	break;
321	}
322	if (Setmode(channels_mode)<0) {
323	DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
324	}
325
326	dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
327	prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
328	switch(cookie_mcsn->play) {
329	case MCSN_TT:
330	Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
331	Soundcmd(SETPRESCALE, prediv);
332	DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
333	break;
334	case MCSN_FALCON:
335	Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
336	DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
337	break;
338	}
339
340	/* Set buffer */
341	buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
342	if (Setbuffer(0, buffer, buffer + spec->size)<0) {
343	DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
344	}
345
346	if (SDL_MintAudio_mint_present) {
347	SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0);
348	} else {
349	/* Install interrupt */
350	Jdisint(MFP_DMASOUND);
351	Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
352	Jenabint(MFP_DMASOUND);
353
354	if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
355	DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
356	}
357	}
358
359	/* Go */
360	Buffoper(SB_PLA_ENA\|SB_PLA_RPT);
361	DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
362	}
363
364	static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
365	{
366	/* Lock sound system */
367	if (Locksnd()!=1) {
368	SDL_SetError("Mint_OpenAudio: Audio system already in use");
369	return(-1);
370	}
371
372	SDL_MintAudio_device = this;
373
374	/* Check audio capabilities */
375	if (Mint_CheckAudio(this, spec)==-1) {
376	return -1;
377	}
378
379	SDL_CalculateAudioSpec(spec);
380
381	/* Allocate memory for audio buffers in DMA-able RAM */
382	DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
383
384	SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
385	if (SDL_MintAudio_audiobuf[0]==NULL) {
386	SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
387	return (-1);
388	}
389	SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
390	SDL_MintAudio_numbuf=0;
391	SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
392	SDL_MintAudio_audiosize = spec->size;
393	SDL_MintAudio_mutex = 0;
394
395	DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
396	DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
397
398	SDL_MintAudio_CheckFpu();
399
400	/* Setup audio hardware */
401	Mint_InitAudio(this, spec);
402
403	return(1); /* We don't use SDL threaded audio */
404	}