/
SDL_mintaudio_mcsn.c
404 lines (332 loc) · 10.4 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2009 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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
*/
22
#include "SDL_config.h"
23
24
25
26
27
28
29
30
/*
MiNT audio driver
using XBIOS functions (MacSound compatible driver)
Patrice Mandin
*/
31
#include <support.h>
32
33
34
35
36
37
38
/* Mint includes */
#include <mint/osbind.h>
#include <mint/falcon.h>
#include <mint/cookie.h>
#include "SDL_audio.h"
39
40
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
41
42
#include "../../video/ataricommon/SDL_atarimxalloc_c.h"
43
44
45
46
47
48
49
50
51
52
#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: "
53
#if 0
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
#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)
{
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
89
90
91
if (Getcookie(C_MagX, &dummy) == C_FOUND) {
return(0);
}
92
/* Check if user asked a different audio driver */
93
if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
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)
{
140
141
SDL_free(device->hidden);
SDL_free(device);
142
143
144
145
146
147
148
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* 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
156
157
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
158
SDL_free(this);
159
160
161
}
return(0);
}
162
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/* 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 */
194
SDL_MintAudio_WaitThread();
195
196
Buffoper(0);
197
198
199
200
if (!SDL_MintAudio_mint_present) {
/* Uninstall interrupt */
Jdisint(MFP_DMASOUND);
}
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/* 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)));
223
DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
224
225
226
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
227
228
229
230
if (spec->channels > 2) {
spec->channels = 2; /* no more than stereo! */
}
231
/* Check formats available */
232
MINTAUDIO_freqcount=0;
233
234
235
236
switch(cookie_mcsn->play) {
case MCSN_ST:
spec->channels=1;
spec->format=8; /* FIXME: is it signed or unsigned ? */
237
SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
238
239
240
241
242
243
244
245
246
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;
}
247
for (i=0; i<4; i++) {
248
249
SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
masterclock, 3-i, -1);
250
251
252
}
break;
case MCSN_FALCON: /* Also Mac */
253
254
255
256
257
for (i=1; i<12; i++) {
/* Remove unusable Falcon codec predivisors */
if ((i==6) || (i==8) || (i==10)) {
continue;
}
258
259
SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
CLK25M, i+1, -1);
260
}
261
262
if (cookie_mcsn->res1 != 0) {
for (i=1; i<4; i++) {
263
264
SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
CLKEXT, (1<<i)-1, -1);
265
}
266
267
268
269
270
271
272
273
274
}
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;
}
275
276
277
278
279
280
281
282
283
284
285
#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;
286
287
288
DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
289
DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
290
291
292
293
294
295
296
297
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
return 0;
}
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
{
298
int channels_mode, prediv, dmaclock;
299
300
301
void *buffer;
/* Stop currently playing sound */
302
303
304
SDL_MintAudio_quit_thread = SDL_FALSE;
SDL_MintAudio_thread_finished = SDL_TRUE;
SDL_MintAudio_WaitThread();
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
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"));
}
326
327
dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
328
329
330
switch(cookie_mcsn->play) {
case MCSN_TT:
Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
331
Soundcmd(SETPRESCALE, prediv);
332
333
334
DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
break;
case MCSN_FALCON:
335
336
Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
337
338
339
340
341
342
343
344
345
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"));
}
346
347
348
349
350
351
352
353
354
355
356
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"));
}
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
}
/* 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;
391
SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
392
393
394
395
396
397
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]));
398
399
SDL_MintAudio_CheckFpu();
400
401
402
/* Setup audio hardware */
Mint_InitAudio(this, spec);
403
return(1); /* We don't use SDL threaded audio */
404
}