/
SDL_mintaudio_mcsn.c
383 lines (315 loc) · 9.61 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2012 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
43
44
45
46
47
48
49
50
#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: "
51
#if 0
52
53
54
55
56
57
58
59
60
61
#define DEBUG_PRINT(what) \
{ \
printf what; \
}
#else
#define DEBUG_PRINT(what)
#endif
/*--- Static variables ---*/
62
static long cookie_snd, cookie_mch;
63
64
65
66
67
68
69
70
71
72
73
74
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);
75
static void Mint_SwapBuffers(Uint8 *nextbuf, int nextsize);
76
77
78
79
80
/*--- Audio driver bootstrap functions ---*/
static int Audio_Available(void)
{
81
long dummy;
82
const char *envr = SDL_getenv("SDL_AUDIODRIVER");
83
84
SDL_MintAudio_mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
85
86
/* We can't use XBIOS in interrupt with Magic, don't know about thread */
87
88
89
90
if (Getcookie(C_MagX, &dummy) == C_FOUND) {
return(0);
}
91
/* Check if user asked a different audio driver */
92
if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
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 ? */
114
if (Getcookie(C_McSn, &dummy) != C_FOUND) {
115
116
117
DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n"));
return(0);
}
118
cookie_mcsn = (cookie_mcsn_t *) dummy;
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/* 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
SDL_MintAudio_FreeBuffers();
203
204
205
206
207
208
209
210
211
212
213
214
/* 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)));
215
DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
216
217
218
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
219
220
221
222
if (spec->channels > 2) {
spec->channels = 2; /* no more than stereo! */
}
223
/* Check formats available */
224
MINTAUDIO_freqcount=0;
225
226
227
228
switch(cookie_mcsn->play) {
case MCSN_ST:
spec->channels=1;
spec->format=8; /* FIXME: is it signed or unsigned ? */
229
SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1);
230
231
232
233
234
235
236
237
238
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;
}
239
for (i=0; i<4; i++) {
240
241
SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
masterclock, 3-i, -1);
242
243
244
}
break;
case MCSN_FALCON: /* Also Mac */
245
246
247
248
249
for (i=1; i<12; i++) {
/* Remove unusable Falcon codec predivisors */
if ((i==6) || (i==8) || (i==10)) {
continue;
}
250
251
SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)),
CLK25M, i+1, -1);
252
}
253
254
if (cookie_mcsn->res1 != 0) {
for (i=1; i<4; i++) {
255
256
SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)),
CLKEXT, (1<<i)-1, -1);
257
}
258
259
260
261
262
263
264
265
266
}
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;
}
267
#if 0
268
269
270
271
272
273
274
275
276
277
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;
278
279
280
DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
281
DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
282
283
284
285
286
287
288
289
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
return 0;
}
static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
{
290
int channels_mode, prediv, dmaclock;
291
292
/* Stop currently playing sound */
293
294
295
SDL_MintAudio_quit_thread = SDL_FALSE;
SDL_MintAudio_thread_finished = SDL_TRUE;
SDL_MintAudio_WaitThread();
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
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"));
}
317
318
dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock;
prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
319
320
321
switch(cookie_mcsn->play) {
case MCSN_TT:
Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1);
322
Soundcmd(SETPRESCALE, prediv);
323
324
325
DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n"));
break;
case MCSN_FALCON:
326
327
Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1);
DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n"));
328
329
330
331
break;
}
/* Set buffer */
332
Mint_SwapBuffers(MINTAUDIO_audiobuf[0], MINTAUDIO_audiosize);
333
334
335
336
337
338
339
340
341
342
343
344
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"));
}
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
}
/* 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;
}
367
368
if (!SDL_MintAudio_InitBuffers(spec)) {
return -1;
369
}
370
371
/* Setup audio hardware */
372
MINTAUDIO_swapbuf = Mint_SwapBuffers;
373
374
Mint_InitAudio(this, spec);
375
return(1); /* We don't use SDL threaded audio */
376
}
377
378
379
380
381
382
383
static void Mint_SwapBuffers(Uint8 *nextbuf, int nextsize)
{
unsigned long buffer = (unsigned long) nextbuf;
Setbuffer(0, buffer, buffer + nextsize);
}