1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 (at) libsdl.org 21 */ 22 #include "SDL_config.h" 23 24 /* 25 MiNT audio driver 26 using XBIOS functions (MacSound compatible driver) 27 28 Patrice Mandin 29 */ 30 31 #include <support.h> 32 33 /* Mint includes */ 34 #include <mint/osbind.h> 35 #include <mint/falcon.h> 36 #include <mint/cookie.h> 37 38 #include "SDL_audio.h" 39 #include "../SDL_audio_c.h" 40 #include "../SDL_sysaudio.h" 41 42 #include "../../video/ataricommon/SDL_atarimxalloc_c.h" 43 44 #include "SDL_mintaudio.h" 45 #include "SDL_mintaudio_mcsn.h" 46 47 /*--- Defines ---*/ 48 49 #define MINT_AUDIO_DRIVER_NAME "mint_mcsn" 50 51 /* Debug print info */ 52 #define DEBUG_NAME "audio:mcsn: " 53 #if 0 54 #define DEBUG_PRINT(what) \ 55 { \ 56 printf what; \ 57 } 58 #else 59 #define DEBUG_PRINT(what) 60 #endif 61 62 /*--- Static variables ---*/ 63 64 static long cookie_snd, cookie_mch; 65 static cookie_mcsn_t *cookie_mcsn; 66 67 /*--- Audio driver functions ---*/ 68 69 static void Mint_CloseAudio(_THIS); 70 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec); 71 static void Mint_LockAudio(_THIS); 72 static void Mint_UnlockAudio(_THIS); 73 74 /* To check/init hardware audio */ 75 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec); 76 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec); 77 78 /*--- Audio driver bootstrap functions ---*/ 79 80 static int Audio_Available(void) 81 { 82 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 if (Getcookie(C_MagX, &dummy) == C_FOUND) { 89 return(0); 90 } 91 92 /* Check if user asked a different audio driver */ 93 if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) { 94 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n")); 95 return(0); 96 } 97 98 /* Cookie _MCH present ? if not, assume ST machine */ 99 if (Getcookie(C__MCH, &cookie_mch) == C_NOTFOUND) { 100 cookie_mch = MCH_ST; 101 } 102 103 /* Cookie _SND present ? if not, assume ST machine */ 104 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { 105 cookie_snd = SND_PSG; 106 } 107 108 /* Check if we have 16 bits audio */ 109 if ((cookie_snd & SND_16BIT)==0) { 110 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n")); 111 return(0); 112 } 113 114 /* Cookie MCSN present ? */ 115 if (Getcookie(C_McSn, &dummy) != C_FOUND) { 116 DEBUG_PRINT((DEBUG_NAME "no MCSN audio\n")); 117 return(0); 118 } 119 cookie_mcsn = (cookie_mcsn_t *) dummy; 120 121 /* Check if interrupt at end of replay */ 122 if (cookie_mcsn->pint == 0) { 123 DEBUG_PRINT((DEBUG_NAME "no interrupt at end of replay\n")); 124 return(0); 125 } 126 127 /* Check if audio is lockable */ 128 if (Locksnd()!=1) { 129 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n")); 130 return(0); 131 } 132 133 Unlocksnd(); 134 135 DEBUG_PRINT((DEBUG_NAME "MCSN audio available!\n")); 136 return(1); 137 } 138 139 static void Audio_DeleteDevice(SDL_AudioDevice *device) 140 { 141 SDL_free(device->hidden); 142 SDL_free(device); 143 } 144 145 static SDL_AudioDevice *Audio_CreateDevice(int devindex) 146 { 147 SDL_AudioDevice *this; 148 149 /* Initialize all variables that we clean on shutdown */ 150 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 151 if ( this ) { 152 SDL_memset(this, 0, (sizeof *this)); 153 this->hidden = (struct SDL_PrivateAudioData *) 154 SDL_malloc((sizeof *this->hidden)); 155 } 156 if ( (this == NULL) || (this->hidden == NULL) ) { 157 SDL_OutOfMemory(); 158 if ( this ) { 159 SDL_free(this); 160 } 161 return(0); 162 } 163 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 164 165 /* Set the function pointers */ 166 this->OpenAudio = Mint_OpenAudio; 167 this->CloseAudio = Mint_CloseAudio; 168 this->LockAudio = Mint_LockAudio; 169 this->UnlockAudio = Mint_UnlockAudio; 170 this->free = Audio_DeleteDevice; 171 172 return this; 173 } 174 175 AudioBootStrap MINTAUDIO_MCSN_bootstrap = { 176 MINT_AUDIO_DRIVER_NAME, "MiNT MCSN audio driver", 177 Audio_Available, Audio_CreateDevice 178 }; 179 180 static void Mint_LockAudio(_THIS) 181 { 182 /* Stop replay */ 183 Buffoper(0); 184 } 185 186 static void Mint_UnlockAudio(_THIS) 187 { 188 /* Restart replay */ 189 Buffoper(SB_PLA_ENA|SB_PLA_RPT); 190 } 191 192 static void Mint_CloseAudio(_THIS) 193 { 194 /* Stop replay */ 195 SDL_MintAudio_WaitThread(); 196 Buffoper(0); 197 198 if (!SDL_MintAudio_mint_present) { 199 /* Uninstall interrupt */ 200 Jdisint(MFP_DMASOUND); 201 } 202 203 /* Wait if currently playing sound */ 204 while (SDL_MintAudio_mutex != 0) { 205 } 206 207 /* Clear buffers */ 208 if (SDL_MintAudio_audiobuf[0]) { 209 Mfree(SDL_MintAudio_audiobuf[0]); 210 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; 211 } 212 213 /* Unlock sound system */ 214 Unlocksnd(); 215 } 216 217 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec) 218 { 219 int i; 220 unsigned long masterclock, masterprediv; 221 222 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff)); 223 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); 224 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); 225 DEBUG_PRINT(("channels=%d, ", spec->channels)); 226 DEBUG_PRINT(("freq=%d\n", spec->freq)); 227 228 if (spec->channels > 2) { 229 spec->channels = 2; /* no more than stereo! */ 230 } 231 232 /* Check formats available */ 233 MINTAUDIO_freqcount=0; 234 switch(cookie_mcsn->play) { 235 case MCSN_ST: 236 spec->channels=1; 237 spec->format=8; /* FIXME: is it signed or unsigned ? */ 238 SDL_MintAudio_AddFrequency(this, 12500, 0, 0, -1); 239 break; 240 case MCSN_TT: /* Also STE, Mega STE */ 241 spec->format=AUDIO_S8; 242 masterclock=MASTERCLOCK_STE; 243 masterprediv=MASTERPREDIV_STE; 244 if ((cookie_mch>>16)==MCH_TT) { 245 masterclock=MASTERCLOCK_TT; 246 masterprediv=MASTERPREDIV_TT; 247 } 248 for (i=0; i<4; i++) { 249 SDL_MintAudio_AddFrequency(this, masterclock/(masterprediv*(1<<i)), 250 masterclock, 3-i, -1); 251 } 252 break; 253 case MCSN_FALCON: /* Also Mac */ 254 for (i=1; i<12; i++) { 255 /* Remove unusable Falcon codec predivisors */ 256 if ((i==6) || (i==8) || (i==10)) { 257 continue; 258 } 259 SDL_MintAudio_AddFrequency(this, MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1)), 260 CLK25M, i+1, -1); 261 } 262 if (cookie_mcsn->res1 != 0) { 263 for (i=1; i<4; i++) { 264 SDL_MintAudio_AddFrequency(this, (cookie_mcsn->res1)/(MASTERPREDIV_FALCON*(1<<i)), 265 CLKEXT, (1<<i)-1, -1); 266 } 267 } 268 spec->format |= 0x8000; /* Audio is always signed */ 269 if ((spec->format & 0x00ff)==16) { 270 spec->format |= 0x1000; /* Audio is always big endian */ 271 spec->channels=2; /* 16 bits always stereo */ 272 } 273 break; 274 } 275 276 #if 0 277 for (i=0; i<MINTAUDIO_freqcount; i++) { 278 DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", 279 i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock, 280 MINTAUDIO_frequencies[i].predivisor 281 )); 282 } 283 #endif 284 285 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq); 286 spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; 287 288 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); 289 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); 290 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); 291 DEBUG_PRINT(("channels=%d, ", spec->channels)); 292 DEBUG_PRINT(("freq=%d\n", spec->freq)); 293 294 return 0; 295 } 296 297 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) 298 { 299 int channels_mode, prediv, dmaclock; 300 void *buffer; 301 302 /* Stop currently playing sound */ 303 SDL_MintAudio_quit_thread = SDL_FALSE; 304 SDL_MintAudio_thread_finished = SDL_TRUE; 305 SDL_MintAudio_WaitThread(); 306 Buffoper(0); 307 308 /* Set replay tracks */ 309 Settracks(0,0); 310 Setmontracks(0); 311 312 /* Select replay format */ 313 channels_mode=STEREO16; 314 switch (spec->format & 0xff) { 315 case 8: 316 if (spec->channels==2) { 317 channels_mode=STEREO8; 318 } else { 319 channels_mode=MONO8; 320 } 321 break; 322 } 323 if (Setmode(channels_mode)<0) { 324 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); 325 } 326 327 dmaclock = MINTAUDIO_frequencies[MINTAUDIO_numfreq].masterclock; 328 prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; 329 switch(cookie_mcsn->play) { 330 case MCSN_TT: 331 Devconnect(DMAPLAY, DAC, CLK25M, CLKOLD, 1); 332 Soundcmd(SETPRESCALE, prediv); 333 DEBUG_PRINT((DEBUG_NAME "STE/TT prescaler selected\n")); 334 break; 335 case MCSN_FALCON: 336 Devconnect(DMAPLAY, DAC, dmaclock, prediv, 1); 337 DEBUG_PRINT((DEBUG_NAME "Falcon prescaler selected\n")); 338 break; 339 } 340 341 /* Set buffer */ 342 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; 343 if (Setbuffer(0, buffer, buffer + spec->size)<0) { 344 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); 345 } 346 347 if (SDL_MintAudio_mint_present) { 348 SDL_MintAudio_thread_pid = tfork(SDL_MintAudio_Thread, 0); 349 } else { 350 /* Install interrupt */ 351 Jdisint(MFP_DMASOUND); 352 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt); 353 Jenabint(MFP_DMASOUND); 354 355 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) { 356 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n")); 357 } 358 } 359 360 /* Go */ 361 Buffoper(SB_PLA_ENA|SB_PLA_RPT); 362 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); 363 } 364 365 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec) 366 { 367 /* Lock sound system */ 368 if (Locksnd()!=1) { 369 SDL_SetError("Mint_OpenAudio: Audio system already in use"); 370 return(-1); 371 } 372 373 SDL_MintAudio_device = this; 374 375 /* Check audio capabilities */ 376 if (Mint_CheckAudio(this, spec)==-1) { 377 return -1; 378 } 379 380 SDL_CalculateAudioSpec(spec); 381 382 /* Allocate memory for audio buffers in DMA-able RAM */ 383 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size)); 384 385 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM); 386 if (SDL_MintAudio_audiobuf[0]==NULL) { 387 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer"); 388 return (-1); 389 } 390 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ; 391 SDL_MintAudio_numbuf=0; 392 SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2); 393 SDL_MintAudio_audiosize = spec->size; 394 SDL_MintAudio_mutex = 0; 395 396 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0])); 397 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1])); 398 399 SDL_MintAudio_CheckFpu(); 400 401 /* Setup audio hardware */ 402 Mint_InitAudio(this, spec); 403 404 return(1); /* We don't use SDL threaded audio */ 405 } 406
