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 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 | |
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 | |
117 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
118 | { |
119 | SDL_free(device->hidden); |
120 | SDL_free(device); |
121 | } |
122 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | } |