1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2004 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 DMA 8bits (hardware access)
27
28 Patrice Mandin
29 */
30
31 /* Mint includes */
32 #include <mint/osbind.h>
33 #include <mint/falcon.h>
34 #include <mint/cookie.h>
35
36 #include "SDL_audio.h"
37 #include "../SDL_audio_c.h"
38 #include "../SDL_sysaudio.h"
39
40 #include "../../video/ataricommon/SDL_atarimxalloc_c.h"
41
42 #include "SDL_mintaudio.h"
43 #include "SDL_mintaudio_dma8.h"
44
45 /*--- Defines ---*/
46
47 #define MINT_AUDIO_DRIVER_NAME "mint_dma8"
48
49 /* Debug print info */
50 #define DEBUG_NAME "audio:dma8: "
51 #if 0
52 #define DEBUG_PRINT(what) \
53 { \
54 printf what; \
55 }
56 #else
57 #define DEBUG_PRINT(what)
58 #endif
59
60 /*--- Static variables ---*/
61
62 static unsigned long cookie_snd, cookie_mch;
63
64 /*--- Audio driver functions ---*/
65
66 static void Mint_CloseAudio(_THIS);
67 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
68 static void Mint_LockAudio(_THIS);
69 static void Mint_UnlockAudio(_THIS);
70
71 /* To check/init hardware audio */
72 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
73 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
74
75 /*--- Audio driver bootstrap functions ---*/
76
Audio_Available(void)77 static int Audio_Available(void)
78 {
79 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
80
81 /* Check if user asked a different audio driver */
82 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
83 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
84 return 0;
85 }
86
87 /* Cookie _MCH present ? if not, assume ST machine */
88 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) {
89 cookie_mch = MCH_ST;
90 }
91
92 /* Cookie _SND present ? if not, assume ST machine */
93 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
94 cookie_snd = SND_PSG;
95 }
96
97 /* Check if we have 8 bits audio */
98 if ((cookie_snd & SND_8BIT)==0) {
99 DEBUG_PRINT((DEBUG_NAME "no 8 bits sound\n"));
100 return(0);
101 }
102
103 /* Check if audio is lockable */
104 if (cookie_snd & SND_16BIT) {
105 if (Locksnd()!=1) {
106 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
107 return(0);
108 }
109
110 Unlocksnd();
111 }
112
113 DEBUG_PRINT((DEBUG_NAME "8 bits audio available!\n"));
114 return(1);
115 }
116
Audio_DeleteDevice(SDL_AudioDevice * device)117 static void Audio_DeleteDevice(SDL_AudioDevice *device)
118 {
119 SDL_free(device->hidden);
120 SDL_free(device);
121 }
122
Audio_CreateDevice(int devindex)123 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
124 {
125 SDL_AudioDevice *this;
126
127 /* Initialize all variables that we clean on shutdown */
128 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
129 if ( this ) {
130 SDL_memset(this, 0, (sizeof *this));
131 this->hidden = (struct SDL_PrivateAudioData *)
132 SDL_malloc((sizeof *this->hidden));
133 }
134 if ( (this == NULL) || (this->hidden == NULL) ) {
135 SDL_OutOfMemory();
136 if ( this ) {
137 SDL_free(this);
138 }
139 return(0);
140 }
141 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
142
143 /* Set the function pointers */
144 this->OpenAudio = Mint_OpenAudio;
145 this->CloseAudio = Mint_CloseAudio;
146 this->LockAudio = Mint_LockAudio;
147 this->UnlockAudio = Mint_UnlockAudio;
148 this->free = Audio_DeleteDevice;
149
150 return this;
151 }
152
153 AudioBootStrap MINTAUDIO_DMA8_bootstrap = {
154 MINT_AUDIO_DRIVER_NAME, "MiNT DMA 8 bits audio driver",
155 Audio_Available, Audio_CreateDevice
156 };
157
Mint_LockAudio(_THIS)158 static void Mint_LockAudio(_THIS)
159 {
160 void *oldpile;
161
162 /* Stop replay */
163 oldpile=(void *)Super(0);
164 DMAAUDIO_IO.control=0;
165 Super(oldpile);
166 }
167
Mint_UnlockAudio(_THIS)168 static void Mint_UnlockAudio(_THIS)
169 {
170 void *oldpile;
171
172 /* Restart replay */
173 oldpile=(void *)Super(0);
174 DMAAUDIO_IO.control=3;
175 Super(oldpile);
176 }
177
Mint_CloseAudio(_THIS)178 static void Mint_CloseAudio(_THIS)
179 {
180 void *oldpile;
181
182 /* Stop replay */
183 oldpile=(void *)Super(0);
184 DMAAUDIO_IO.control=0;
185 Super(oldpile);
186
187 DEBUG_PRINT((DEBUG_NAME "closeaudio: replay stopped\n"));
188
189 /* Disable interrupt */
190 Jdisint(MFP_DMASOUND);
191
192 DEBUG_PRINT((DEBUG_NAME "closeaudio: interrupt disabled\n"));
193
194 /* Wait if currently playing sound */
195 while (SDL_MintAudio_mutex != 0) {
196 }
197
198 DEBUG_PRINT((DEBUG_NAME "closeaudio: no more interrupt running\n"));
199
200 /* Clear buffers */
201 if (SDL_MintAudio_audiobuf[0]) {
202 Mfree(SDL_MintAudio_audiobuf[0]);
203 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
204 }
205
206 DEBUG_PRINT((DEBUG_NAME "closeaudio: buffers freed\n"));
207 }
208
Mint_CheckAudio(_THIS,SDL_AudioSpec * spec)209 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
210 {
211 int i, masterprediv, sfreq;
212 unsigned long masterclock;
213
214 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
215 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
216 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
217 DEBUG_PRINT(("channels=%d, ", spec->channels));
218 DEBUG_PRINT(("freq=%d\n", spec->freq));
219
220 if (spec->channels > 2)
221 spec->channels = 2;
222
223 /* Check formats available */
224 spec->format = AUDIO_S8;
225
226 /* Calculate and select the closest frequency */
227 sfreq=0;
228 masterclock=MASTERCLOCK_STE;
229 masterprediv=MASTERPREDIV_STE;
230 switch(cookie_mch>>16) {
231 /*
232 case MCH_STE:
233 masterclock=MASTERCLOCK_STE;
234 masterprediv=MASTERPREDIV_STE;
235 break;
236 */
237 case MCH_TT:
238 masterclock=MASTERCLOCK_TT;
239 masterprediv=MASTERPREDIV_TT;
240 break;
241 case MCH_F30:
242 case MCH_ARANYM:
243 masterclock=MASTERCLOCK_FALCON1;
244 masterprediv=MASTERPREDIV_FALCON;
245 sfreq=1;
246 break;
247 }
248
249 MINTAUDIO_freqcount=0;
250 for (i=sfreq;i<4;i++) {
251 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)),
252 masterclock, i-sfreq, -1);
253 }
254
255 #if 1
256 for (i=0; i<MINTAUDIO_freqcount; i++) {
257 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n",
258 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock,
259 MINTAUDIO_frequencies[i].predivisor
260 ));
261 }
262 #endif
263
264 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq);
265 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency;
266
267 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
268 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
269 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
270 DEBUG_PRINT(("channels=%d, ", spec->channels));
271 DEBUG_PRINT(("freq=%d\n", spec->freq));
272
273 return 0;
274 }
275
Mint_InitAudio(_THIS,SDL_AudioSpec * spec)276 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
277 {
278 void *oldpile;
279 unsigned long buffer;
280 unsigned char mode;
281
282 /* Set replay tracks */
283 if (cookie_snd & SND_16BIT) {
284 Settracks(0,0);
285 Setmontracks(0);
286 }
287
288 oldpile=(void *)Super(0);
289
290 /* Stop currently playing sound */
291 DMAAUDIO_IO.control=0;
292
293 /* Set buffer */
294 buffer = (unsigned long) SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
295 DMAAUDIO_IO.start_high = (buffer>>16) & 255;
296 DMAAUDIO_IO.start_mid = (buffer>>8) & 255;
297 DMAAUDIO_IO.start_low = buffer & 255;
298
299 buffer += SDL_MintAudio_audiosize;
300 DMAAUDIO_IO.end_high = (buffer>>16) & 255;
301 DMAAUDIO_IO.end_mid = (buffer>>8) & 255;
302 DMAAUDIO_IO.end_low = buffer & 255;
303
304 mode = 3-MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor;
305 if (spec->channels==1) {
306 mode |= 1<<7;
307 }
308 DMAAUDIO_IO.sound_ctrl = mode;
309
310 /* Set interrupt */
311 Jdisint(MFP_DMASOUND);
312 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_Dma8Interrupt);
313 Jenabint(MFP_DMASOUND);
314
315 if (cookie_snd & SND_16BIT) {
316 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
317 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
318 }
319 }
320
321 /* Go */
322 DMAAUDIO_IO.control = 3; /* playback + repeat */
323
324 Super(oldpile);
325 }
326
Mint_OpenAudio(_THIS,SDL_AudioSpec * spec)327 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
328 {
329 SDL_MintAudio_device = this;
330
331 /* Check audio capabilities */
332 if (Mint_CheckAudio(this, spec)==-1) {
333 return -1;
334 }
335
336 SDL_CalculateAudioSpec(spec);
337
338 /* Allocate memory for audio buffers in DMA-able RAM */
339 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
340
341 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
342 if (SDL_MintAudio_audiobuf[0]==NULL) {
343 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
344 return (-1);
345 }
346 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
347 SDL_MintAudio_numbuf=0;
348 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
349 SDL_MintAudio_audiosize = spec->size;
350 SDL_MintAudio_mutex = 0;
351
352 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
353 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
354
355 SDL_MintAudio_CheckFpu();
356
357 /* Setup audio hardware */
358 Mint_InitAudio(this, spec);
359
360 return(1); /* We don't use threaded audio */
361 }
362