This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_mintaudio_gsxb.c
470 lines (389 loc) · 12.9 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2004 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
31
32
33
34
35
36
/*
MiNT audio driver
using XBIOS functions (GSXB compatible driver)
Patrice Mandin
*/
/* Mint includes */
#include <mint/osbind.h>
#include <mint/falcon.h>
#include <mint/cookie.h>
#include "SDL_audio.h"
37
38
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
39
40
#include "../../video/ataricommon/SDL_atarimxalloc_c.h"
41
42
43
44
45
46
47
48
49
50
#include "SDL_mintaudio.h"
#include "SDL_mintaudio_gsxb.h"
/*--- Defines ---*/
#define MINT_AUDIO_DRIVER_NAME "mint_gsxb"
/* Debug print info */
#define DEBUG_NAME "audio:gsxb: "
51
#if 0
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
#define DEBUG_PRINT(what) \
{ \
printf what; \
}
#else
#define DEBUG_PRINT(what)
#endif
/*--- Static variables ---*/
static unsigned long cookie_snd, cookie_gsxb;
/*--- Audio driver functions ---*/
static void Mint_CloseAudio(_THIS);
67
static int Mint_OpenAudio(_THIS, SDL_AudioSpec * spec);
68
69
70
71
static void Mint_LockAudio(_THIS);
static void Mint_UnlockAudio(_THIS);
/* To check/init hardware audio */
72
73
static int Mint_CheckAudio(_THIS, SDL_AudioSpec * spec);
static void Mint_InitAudio(_THIS, SDL_AudioSpec * spec);
74
75
76
77
78
/* GSXB callbacks */
static void Mint_GsxbInterrupt(void);
static void Mint_GsxbNullInterrupt(void);
79
80
/*--- Audio driver bootstrap functions ---*/
81
82
static int
Audio_Available(void)
83
{
84
const char *envr = SDL_getenv("SDL_AUDIODRIVER");
85
86
87
88
89
90
/* 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);
}
91
92
93
94
95
/* Cookie _SND present ? if not, assume ST machine */
if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
cookie_snd = SND_PSG;
}
96
97
98
99
100
101
/* Check if we have 16 bits audio */
if ((cookie_snd & SND_16BIT) == 0) {
DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
return (0);
}
102
103
104
/* Cookie GSXB present ? */
cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND);
105
106
107
108
109
110
/* Is it GSXB ? */
if (((cookie_snd & SND_GSXB) == 0) || (cookie_gsxb == 0)) {
DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n"));
return (0);
}
111
112
113
114
115
116
/* Check if audio is lockable */
if (Locksnd() != 1) {
DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
return (0);
}
117
118
Unlocksnd();
119
120
121
DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n"));
return (1);
122
123
}
124
125
static void
Audio_DeleteDevice(SDL_AudioDevice * device)
126
{
127
128
SDL_free(device->hidden);
SDL_free(device);
129
130
}
131
132
static SDL_AudioDevice *
Audio_CreateDevice(int devindex)
133
{
134
SDL_AudioDevice *this;
135
136
137
138
/* Initialize all variables that we clean on shutdown */
this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
if (this) {
139
SDL_memset(this, 0, (sizeof *this));
140
this->hidden = (struct SDL_PrivateAudioData *)
141
SDL_malloc((sizeof *this->hidden));
142
}
143
if ((this == NULL) || (this->hidden == NULL)) {
144
SDL_OutOfMemory();
145
if (this) {
146
SDL_free(this);
147
}
148
return (0);
149
}
150
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
151
152
/* Set the function pointers */
153
154
155
this->OpenAudio = Mint_OpenAudio;
this->CloseAudio = Mint_CloseAudio;
this->LockAudio = Mint_LockAudio;
156
this->UnlockAudio = Mint_UnlockAudio;
157
this->free = Audio_DeleteDevice;
158
159
160
161
162
return this;
}
AudioBootStrap MINTAUDIO_GSXB_bootstrap = {
163
164
MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver",
Audio_Available, Audio_CreateDevice
165
166
};
167
168
static void
Mint_LockAudio(_THIS)
169
{
170
171
/* Stop replay */
Buffoper(0);
172
173
}
174
175
static void
Mint_UnlockAudio(_THIS)
176
{
177
178
/* Restart replay */
Buffoper(SB_PLA_ENA | SB_PLA_RPT);
179
180
}
181
182
static void
Mint_CloseAudio(_THIS)
183
{
184
185
/* Stop replay */
Buffoper(0);
186
187
188
189
190
/* Uninstall interrupt */
if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt) < 0) {
DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n"));
}
191
192
193
194
/* Wait if currently playing sound */
while (SDL_MintAudio_mutex != 0) {
}
195
196
197
198
199
200
/* Clear buffers */
if (SDL_MintAudio_audiobuf[0]) {
Mfree(SDL_MintAudio_audiobuf[0]);
SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
}
201
202
203
/* Unlock sound system */
Unlocksnd();
204
205
}
206
207
static int
Mint_CheckAudio(_THIS, SDL_AudioSpec * spec)
208
{
209
210
long snd_format;
int i, resolution, format_signed, format_bigendian;
211
212
SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
int valid_datatype = 0;
213
214
215
216
resolution = SDL_AUDIO_BITSIZE(spec->format);
format_signed = SDL_AUDIO_ISSIGNED(spec->format);
format_bigendian = SDL_AUDIO_ISBIGENDIAN(spec->format);
217
218
219
220
221
DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ", resolution));
DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
DEBUG_PRINT(("signed=%d, ", format_signed));
DEBUG_PRINT(("big endian=%d, ", format_bigendian));
222
223
224
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
if (spec->channels > 2) {
spec->channels = 2; /* no more than stereo! */
}
while ((!valid_datatype) && (test_format)) {
spec->format = test_format;
switch (test_format) {
case AUDIO_U8:
case AUDIO_S8:
case AUDIO_U16LSB:
case AUDIO_S16LSB:
case AUDIO_U16MSB:
case AUDIO_S16MSB:
case AUDIO_S32LSB:
case AUDIO_S32MSB:
/* no float support... */
resolution = SDL_AUDIO_BITSIZE(spec->format);
format_signed = SDL_AUDIO_ISSIGNED(spec->format);
format_bigendian = SDL_AUDIO_ISBIGENDIAN(spec->format);
/* Check formats available */
snd_format = Sndstatus(SND_QUERYFORMATS);
switch (resolution) {
case 8:
if (snd_format & SND_FORMAT8) {
valid_datatype = 1;
snd_format = Sndstatus(SND_QUERY8BIT);
}
break;
case 16:
if (snd_format & SND_FORMAT16) {
valid_datatype = 1;
snd_format = Sndstatus(SND_QUERY16BIT);
}
break;
case 32:
if (snd_format & SND_FORMAT32) {
valid_datatype = 1;
snd_format = Sndstatus(SND_QUERY32BIT);
}
break;
}
break;
269
}
270
271
272
273
274
}
if (!valid_datatype) {
SDL_SetError("Unsupported audio format");
return (-1);
275
}
276
277
278
279
280
281
282
/* Check signed/unsigned format */
if (format_signed) {
if (snd_format & SND_FORMATSIGNED) {
/* Ok */
} else if (snd_format & SND_FORMATUNSIGNED) {
/* Give unsigned format */
283
spec->format = spec->format & (~SDL_AUDIO_MASK_SIGNED);
284
285
286
287
288
289
}
} else {
if (snd_format & SND_FORMATUNSIGNED) {
/* Ok */
} else if (snd_format & SND_FORMATSIGNED) {
/* Give signed format */
290
spec->format |= SDL_AUDIO_MASK_SIGNED;
291
292
}
}
293
294
295
296
297
298
if (format_bigendian) {
if (snd_format & SND_FORMATBIGENDIAN) {
/* Ok */
} else if (snd_format & SND_FORMATLITTLEENDIAN) {
/* Give little endian format */
299
spec->format = spec->format & (~SDL_AUDIO_MASK_ENDIAN);
300
301
302
303
304
305
}
} else {
if (snd_format & SND_FORMATLITTLEENDIAN) {
/* Ok */
} else if (snd_format & SND_FORMATBIGENDIAN) {
/* Give big endian format */
306
spec->format |= SDL_AUDIO_MASK_ENDIAN;
307
308
309
310
311
312
313
314
315
316
317
}
}
/* Calculate and select the closest frequency */
MINTAUDIO_freqcount = 0;
for (i = 1; i < 4; i++) {
SDL_MintAudio_AddFrequency(this,
MASTERCLOCK_44K / (MASTERPREDIV_MILAN *
(1 << i)),
MASTERCLOCK_44K, (1 << i) - 1, -1);
}
318
319
#if 1
320
321
322
323
324
325
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));
}
326
327
#endif
328
329
MINTAUDIO_numfreq = SDL_MintAudio_SearchFrequency(this, spec->freq);
spec->freq = MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
330
331
332
333
334
DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ", SDL_AUDIO_BITSIZE(spec->format)));
DEBUG_PRINT(("float=%d, ", SDL_AUDIO_ISFLOAT(spec->format)));
DEBUG_PRINT(("signed=%d, ", SDL_AUDIO_ISSIGNED(spec->format)));
DEBUG_PRINT(("big endian=%d, ", SDL_AUDIO_ISBIGENDIAN(spec->format)));
335
336
DEBUG_PRINT(("channels=%d, ", spec->channels));
DEBUG_PRINT(("freq=%d\n", spec->freq));
337
338
return 0;
339
340
}
341
342
static void
Mint_InitAudio(_THIS, SDL_AudioSpec * spec)
343
{
344
345
346
347
348
349
350
351
352
353
354
int channels_mode, prediv;
void *buffer;
/* Stop currently playing sound */
Buffoper(0);
/* Set replay tracks */
Settracks(0, 0);
Setmontracks(0);
/* Select replay format */
355
switch (SDL_AUDIO_BITSIZE(spec->format)) {
356
357
358
359
360
361
362
363
364
365
366
367
368
369
case 8:
if (spec->channels == 2) {
channels_mode = STEREO8;
} else {
channels_mode = MONO8;
}
break;
case 16:
if (spec->channels == 2) {
channels_mode = STEREO16;
} else {
channels_mode = MONO16;
}
break;
370
371
372
373
374
375
376
case 32:
if (spec->channels == 2) {
channels_mode = STEREO32;
} else {
channels_mode = MONO32;
}
break;
377
378
379
380
381
382
383
default:
channels_mode = STEREO16;
break;
}
if (Setmode(channels_mode) < 0) {
DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
}
384
385
386
prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1);
387
388
389
390
391
392
/* Set buffer */
buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
if (Setbuffer(0, buffer, buffer + spec->size) < 0) {
DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
}
393
394
395
396
397
398
399
400
401
/* Install interrupt */
if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt) < 0) {
DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n"));
}
/* Go */
Buffoper(SB_PLA_ENA | SB_PLA_RPT);
DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
402
403
}
404
405
static int
Mint_OpenAudio(_THIS, SDL_AudioSpec * spec)
406
{
407
408
409
410
411
/* Lock sound system */
if (Locksnd() != 1) {
SDL_SetError("Mint_OpenAudio: Audio system already in use");
return (-1);
}
412
413
SDL_MintAudio_device = this;
414
415
416
417
418
/* Check audio capabilities */
if (Mint_CheckAudio(this, spec) == -1) {
return -1;
}
419
420
SDL_CalculateAudioSpec(spec);
421
422
423
/* Allocate memory for audio buffers in DMA-able RAM */
DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
424
425
426
427
428
429
430
431
432
433
434
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;
435
436
437
438
439
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]));
440
441
442
/* Setup audio hardware */
Mint_InitAudio(this, spec);
443
444
return (1); /* We don't use threaded audio */
445
}
446
447
448
static void
Mint_GsxbInterrupt(void)
449
{
450
Uint8 *newbuf;
451
452
453
if (SDL_MintAudio_mutex)
return;
454
455
SDL_MintAudio_mutex = 1;
456
457
458
459
460
SDL_MintAudio_numbuf ^= 1;
SDL_MintAudio_Callback();
newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize);
461
462
SDL_MintAudio_mutex = 0;
463
464
}
465
466
static void
Mint_GsxbNullInterrupt(void)
467
468
{
}
469
470
/* vi: set ts=4 sw=4 expandtab: */