| 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 | } |