| 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 XBIOS functions (GSXB compatible driver) |
| 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_gsxb.h" |
| 44 | |
| 45 | /*--- Defines ---*/ |
| 46 | |
| 47 | #define MINT_AUDIO_DRIVER_NAME "mint_gsxb" |
| 48 | |
| 49 | /* Debug print info */ |
| 50 | #define DEBUG_NAME "audio:gsxb: " |
| 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_gsxb; |
| 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 | /* GSXB callbacks */ |
| 76 | static void Mint_GsxbInterrupt(void); |
| 77 | static void Mint_GsxbNullInterrupt(void); |
| 78 | |
| 79 | /*--- Audio driver bootstrap functions ---*/ |
| 80 | |
| 81 | static int Audio_Available(void) |
| 82 | { |
| 83 | const char *envr = SDL_getenv("SDL_AUDIODRIVER"); |
| 84 | |
| 85 | /* Check if user asked a different audio driver */ |
| 86 | if ((envr) && (SDL_strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) { |
| 87 | DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n")); |
| 88 | return(0); |
| 89 | } |
| 90 | |
| 91 | /* Cookie _SND present ? if not, assume ST machine */ |
| 92 | if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) { |
| 93 | cookie_snd = SND_PSG; |
| 94 | } |
| 95 | |
| 96 | /* Check if we have 16 bits audio */ |
| 97 | if ((cookie_snd & SND_16BIT)==0) { |
| 98 | DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n")); |
| 99 | return(0); |
| 100 | } |
| 101 | |
| 102 | /* Cookie GSXB present ? */ |
| 103 | cookie_gsxb = (Getcookie(C_GSXB, &cookie_gsxb) == C_FOUND); |
| 104 | |
| 105 | /* Is it GSXB ? */ |
| 106 | if (((cookie_snd & SND_GSXB)==0) || (cookie_gsxb==0)) { |
| 107 | DEBUG_PRINT((DEBUG_NAME "no GSXB audio\n")); |
| 108 | return(0); |
| 109 | } |
| 110 | |
| 111 | /* Check if audio is lockable */ |
| 112 | if (Locksnd()!=1) { |
| 113 | DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n")); |
| 114 | return(0); |
| 115 | } |
| 116 | |
| 117 | Unlocksnd(); |
| 118 | |
| 119 | DEBUG_PRINT((DEBUG_NAME "GSXB audio available!\n")); |
| 120 | return(1); |
| 121 | } |
| 122 | |
| 123 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
| 124 | { |
| 125 | SDL_free(device->hidden); |
| 126 | SDL_free(device); |
| 127 | } |
| 128 | |
| 129 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
| 130 | { |
| 131 | SDL_AudioDevice *this; |
| 132 | |
| 133 | /* Initialize all variables that we clean on shutdown */ |
| 134 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 135 | if ( this ) { |
| 136 | SDL_memset(this, 0, (sizeof *this)); |
| 137 | this->hidden = (struct SDL_PrivateAudioData *) |
| 138 | SDL_malloc((sizeof *this->hidden)); |
| 139 | } |
| 140 | if ( (this == NULL) || (this->hidden == NULL) ) { |
| 141 | SDL_OutOfMemory(); |
| 142 | if ( this ) { |
| 143 | SDL_free(this); |
| 144 | } |
| 145 | return(0); |
| 146 | } |
| 147 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 148 | |
| 149 | /* Set the function pointers */ |
| 150 | this->OpenAudio = Mint_OpenAudio; |
| 151 | this->CloseAudio = Mint_CloseAudio; |
| 152 | this->LockAudio = Mint_LockAudio; |
| 153 | this->UnlockAudio = Mint_UnlockAudio; |
| 154 | this->free = Audio_DeleteDevice; |
| 155 | |
| 156 | return this; |
| 157 | } |
| 158 | |
| 159 | AudioBootStrap MINTAUDIO_GSXB_bootstrap = { |
| 160 | MINT_AUDIO_DRIVER_NAME, "MiNT GSXB audio driver", |
| 161 | Audio_Available, Audio_CreateDevice |
| 162 | }; |
| 163 | |
| 164 | static void Mint_LockAudio(_THIS) |
| 165 | { |
| 166 | /* Stop replay */ |
| 167 | Buffoper(0); |
| 168 | } |
| 169 | |
| 170 | static void Mint_UnlockAudio(_THIS) |
| 171 | { |
| 172 | /* Restart replay */ |
| 173 | Buffoper(SB_PLA_ENA|SB_PLA_RPT); |
| 174 | } |
| 175 | |
| 176 | static void Mint_CloseAudio(_THIS) |
| 177 | { |
| 178 | /* Stop replay */ |
| 179 | Buffoper(0); |
| 180 | |
| 181 | /* Uninstall interrupt */ |
| 182 | if (NSetinterrupt(2, SI_NONE, Mint_GsxbNullInterrupt)<0) { |
| 183 | DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed in close\n")); |
| 184 | } |
| 185 | |
| 186 | /* Wait if currently playing sound */ |
| 187 | while (SDL_MintAudio_mutex != 0) { |
| 188 | } |
| 189 | |
| 190 | /* Clear buffers */ |
| 191 | if (SDL_MintAudio_audiobuf[0]) { |
| 192 | Mfree(SDL_MintAudio_audiobuf[0]); |
| 193 | SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL; |
| 194 | } |
| 195 | |
| 196 | /* Unlock sound system */ |
| 197 | Unlocksnd(); |
| 198 | } |
| 199 | |
| 200 | static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec) |
| 201 | { |
| 202 | long snd_format; |
| 203 | int i, resolution, format_signed, format_bigendian; |
| 204 | Uint16 test_format = SDL_FirstAudioFormat(spec->format); |
| 205 | int valid_datatype = 0; |
| 206 | |
| 207 | resolution = spec->format & 0x00ff; |
| 208 | format_signed = ((spec->format & 0x8000)!=0); |
| 209 | format_bigendian = ((spec->format & 0x1000)!=0); |
| 210 | |
| 211 | DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff)); |
| 212 | DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
| 213 | DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
| 214 | DEBUG_PRINT(("channels=%d, ", spec->channels)); |
| 215 | DEBUG_PRINT(("freq=%d\n", spec->freq)); |
| 216 | |
| 217 | if (spec->channels > 2) { |
| 218 | spec->channels = 2; /* no more than stereo! */ |
| 219 | } |
| 220 | |
| 221 | while ((!valid_datatype) && (test_format)) { |
| 222 | /* Check formats available */ |
| 223 | snd_format = Sndstatus(SND_QUERYFORMATS); |
| 224 | spec->format = test_format; |
| 225 | resolution = spec->format & 0xff; |
| 226 | format_signed = (spec->format & (1<<15)); |
| 227 | format_bigendian = (spec->format & (1<<12)); |
| 228 | switch (test_format) { |
| 229 | case AUDIO_U8: |
| 230 | case AUDIO_S8: |
| 231 | if (snd_format & SND_FORMAT8) { |
| 232 | valid_datatype = 1; |
| 233 | snd_format = Sndstatus(SND_QUERY8BIT); |
| 234 | } |
| 235 | break; |
| 236 | |
| 237 | case AUDIO_U16LSB: |
| 238 | case AUDIO_S16LSB: |
| 239 | case AUDIO_U16MSB: |
| 240 | case AUDIO_S16MSB: |
| 241 | if (snd_format & SND_FORMAT16) { |
| 242 | valid_datatype = 1; |
| 243 | snd_format = Sndstatus(SND_QUERY16BIT); |
| 244 | } |
| 245 | break; |
| 246 | |
| 247 | default: |
| 248 | test_format = SDL_NextAudioFormat(); |
| 249 | break; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | if (!valid_datatype) { |
| 254 | SDL_SetError("Unsupported audio format"); |
| 255 | return (-1); |
| 256 | } |
| 257 | |
| 258 | /* Check signed/unsigned format */ |
| 259 | if (format_signed) { |
| 260 | if (snd_format & SND_FORMATSIGNED) { |
| 261 | /* Ok */ |
| 262 | } else if (snd_format & SND_FORMATUNSIGNED) { |
| 263 | /* Give unsigned format */ |
| 264 | spec->format = spec->format & (~0x8000); |
| 265 | } |
| 266 | } else { |
| 267 | if (snd_format & SND_FORMATUNSIGNED) { |
| 268 | /* Ok */ |
| 269 | } else if (snd_format & SND_FORMATSIGNED) { |
| 270 | /* Give signed format */ |
| 271 | spec->format |= 0x8000; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | if (format_bigendian) { |
| 276 | if (snd_format & SND_FORMATBIGENDIAN) { |
| 277 | /* Ok */ |
| 278 | } else if (snd_format & SND_FORMATLITTLEENDIAN) { |
| 279 | /* Give little endian format */ |
| 280 | spec->format = spec->format & (~0x1000); |
| 281 | } |
| 282 | } else { |
| 283 | if (snd_format & SND_FORMATLITTLEENDIAN) { |
| 284 | /* Ok */ |
| 285 | } else if (snd_format & SND_FORMATBIGENDIAN) { |
| 286 | /* Give big endian format */ |
| 287 | spec->format |= 0x1000; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | /* Calculate and select the closest frequency */ |
| 292 | MINTAUDIO_freqcount=0; |
| 293 | for (i=1;i<4;i++) { |
| 294 | SDL_MintAudio_AddFrequency(this, |
| 295 | MASTERCLOCK_44K/(MASTERPREDIV_MILAN*(1<<i)), MASTERCLOCK_44K, |
| 296 | (1<<i)-1, -1); |
| 297 | } |
| 298 | |
| 299 | #if 1 |
| 300 | for (i=0; i<MINTAUDIO_freqcount; i++) { |
| 301 | DEBUG_PRINT((DEBUG_NAME "freq %d: %lu Hz, clock %lu, prediv %d\n", |
| 302 | i, MINTAUDIO_frequencies[i].frequency, MINTAUDIO_frequencies[i].masterclock, |
| 303 | MINTAUDIO_frequencies[i].predivisor |
| 304 | )); |
| 305 | } |
| 306 | #endif |
| 307 | |
| 308 | MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, spec->freq); |
| 309 | spec->freq=MINTAUDIO_frequencies[MINTAUDIO_numfreq].frequency; |
| 310 | |
| 311 | DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff)); |
| 312 | DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0))); |
| 313 | DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0))); |
| 314 | DEBUG_PRINT(("channels=%d, ", spec->channels)); |
| 315 | DEBUG_PRINT(("freq=%d\n", spec->freq)); |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec) |
| 321 | { |
| 322 | int channels_mode, prediv; |
| 323 | void *buffer; |
| 324 | |
| 325 | /* Stop currently playing sound */ |
| 326 | Buffoper(0); |
| 327 | |
| 328 | /* Set replay tracks */ |
| 329 | Settracks(0,0); |
| 330 | Setmontracks(0); |
| 331 | |
| 332 | /* Select replay format */ |
| 333 | switch (spec->format & 0xff) { |
| 334 | case 8: |
| 335 | if (spec->channels==2) { |
| 336 | channels_mode=STEREO8; |
| 337 | } else { |
| 338 | channels_mode=MONO8; |
| 339 | } |
| 340 | break; |
| 341 | case 16: |
| 342 | if (spec->channels==2) { |
| 343 | channels_mode=STEREO16; |
| 344 | } else { |
| 345 | channels_mode=MONO16; |
| 346 | } |
| 347 | break; |
| 348 | default: |
| 349 | channels_mode=STEREO16; |
| 350 | break; |
| 351 | } |
| 352 | if (Setmode(channels_mode)<0) { |
| 353 | DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n")); |
| 354 | } |
| 355 | |
| 356 | prediv = MINTAUDIO_frequencies[MINTAUDIO_numfreq].predivisor; |
| 357 | Devconnect(DMAPLAY, DAC, CLKEXT, prediv, 1); |
| 358 | |
| 359 | /* Set buffer */ |
| 360 | buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
| 361 | if (Setbuffer(0, buffer, buffer + spec->size)<0) { |
| 362 | DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n")); |
| 363 | } |
| 364 | |
| 365 | /* Install interrupt */ |
| 366 | if (NSetinterrupt(2, SI_PLAY, Mint_GsxbInterrupt)<0) { |
| 367 | DEBUG_PRINT((DEBUG_NAME "NSetinterrupt() failed\n")); |
| 368 | } |
| 369 | |
| 370 | /* Go */ |
| 371 | Buffoper(SB_PLA_ENA|SB_PLA_RPT); |
| 372 | DEBUG_PRINT((DEBUG_NAME "hardware initialized\n")); |
| 373 | } |
| 374 | |
| 375 | static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 376 | { |
| 377 | /* Lock sound system */ |
| 378 | if (Locksnd()!=1) { |
| 379 | SDL_SetError("Mint_OpenAudio: Audio system already in use"); |
| 380 | return(-1); |
| 381 | } |
| 382 | |
| 383 | SDL_MintAudio_device = this; |
| 384 | |
| 385 | /* Check audio capabilities */ |
| 386 | if (Mint_CheckAudio(this, spec)==-1) { |
| 387 | return -1; |
| 388 | } |
| 389 | |
| 390 | SDL_CalculateAudioSpec(spec); |
| 391 | |
| 392 | /* Allocate memory for audio buffers in DMA-able RAM */ |
| 393 | DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size)); |
| 394 | |
| 395 | SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM); |
| 396 | if (SDL_MintAudio_audiobuf[0]==NULL) { |
| 397 | SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer"); |
| 398 | return (-1); |
| 399 | } |
| 400 | SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ; |
| 401 | SDL_MintAudio_numbuf=0; |
| 402 | SDL_memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2); |
| 403 | SDL_MintAudio_audiosize = spec->size; |
| 404 | SDL_MintAudio_mutex = 0; |
| 405 | |
| 406 | DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0])); |
| 407 | DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1])); |
| 408 | |
| 409 | SDL_MintAudio_CheckFpu(); |
| 410 | |
| 411 | /* Setup audio hardware */ |
| 412 | Mint_InitAudio(this, spec); |
| 413 | |
| 414 | return(1); /* We don't use threaded audio */ |
| 415 | } |
| 416 | |
| 417 | static void Mint_GsxbInterrupt(void) |
| 418 | { |
| 419 | Uint8 *newbuf; |
| 420 | |
| 421 | if (SDL_MintAudio_mutex) |
| 422 | return; |
| 423 | |
| 424 | SDL_MintAudio_mutex=1; |
| 425 | |
| 426 | SDL_MintAudio_numbuf ^= 1; |
| 427 | SDL_MintAudio_Callback(); |
| 428 | newbuf = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf]; |
| 429 | Setbuffer(0, newbuf, newbuf + SDL_MintAudio_audiosize); |
| 430 | |
| 431 | SDL_MintAudio_mutex=0; |
| 432 | } |
| 433 | |
| 434 | static void Mint_GsxbNullInterrupt(void) |
| 435 | { |
| 436 | } |