Mercurial > sdl-ios-xcode
annotate src/audio/dart/SDL_dart.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | 604d73db6802 |
| children | 19418e4422cb |
| rev | line source |
|---|---|
| 1190 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 1190 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 1190 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 1190 | 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 | |
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13 Lesser General Public License for more details. |
| 1190 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 1190 | 18 |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
| 25 #include "SDL_timer.h" | |
| 26 #include "SDL_audio.h" | |
| 27 #include "SDL_audio_c.h" | |
| 28 #include "SDL_dart.h" | |
| 29 | |
| 30 // Buffer states: | |
| 31 #define BUFFER_EMPTY 0 | |
| 32 #define BUFFER_USED 1 | |
| 33 | |
| 34 typedef struct _tMixBufferDesc { | |
| 35 int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED | |
| 36 SDL_AudioDevice *pSDLAudioDevice; | |
| 37 } tMixBufferDesc, *pMixBufferDesc; | |
| 38 | |
| 39 | |
| 40 //--------------------------------------------------------------------- | |
| 41 // DARTEventFunc | |
| 42 // | |
| 43 // This function is called by DART, when an event occures, like end of | |
| 44 // playback of a buffer, etc... | |
| 45 //--------------------------------------------------------------------- | |
| 46 LONG APIENTRY DARTEventFunc(ULONG ulStatus, | |
| 47 PMCI_MIX_BUFFER pBuffer, | |
| 48 ULONG ulFlags) | |
| 49 { | |
| 50 if (ulFlags && MIX_WRITE_COMPLETE) | |
| 51 { // Playback of buffer completed! | |
| 52 | |
| 53 // Get pointer to buffer description | |
| 54 pMixBufferDesc pBufDesc; | |
| 55 | |
| 56 if (pBuffer) | |
| 57 { | |
| 58 pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm; | |
| 59 | |
| 60 if (pBufDesc) | |
| 61 { | |
| 62 SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice; | |
| 63 // Set the buffer to be empty | |
| 64 pBufDesc->iBufferUsage = BUFFER_EMPTY; | |
| 65 // And notify DART feeder thread that it will have to work a bit. | |
| 66 if (pSDLAudioDevice) | |
| 67 DosPostEventSem(pSDLAudioDevice->hidden->hevAudioBufferPlayed); | |
| 68 } | |
| 69 } | |
| 70 } | |
| 71 return TRUE; | |
| 72 } | |
| 73 | |
| 74 | |
| 75 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 76 { | |
| 77 MCI_AMP_OPEN_PARMS AmpOpenParms; | |
| 78 MCI_GENERIC_PARMS GenericParms; | |
| 79 int iDeviceOrd = 0; // Default device to be used | |
| 80 int bOpenShared = 1; // Try opening it shared | |
| 81 int iBits = 16; // Default is 16 bits signed | |
| 82 int iFreq = 44100; // Default is 44KHz | |
| 83 int iChannels = 2; // Default is 2 channels (Stereo) | |
| 84 int iNumBufs = 2; // Number of audio buffers: 2 | |
| 85 int iBufSize; | |
| 86 int iOpenMode; | |
| 87 int iSilence; | |
| 88 int rc; | |
| 89 | |
| 90 // First thing is to try to open a given DART device! | |
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91 SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS)); |
| 1190 | 92 // pszDeviceType should contain the device type in low word, and device ordinal in high word! |
| 93 AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16)); | |
| 94 | |
| 95 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID; | |
| 96 if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE; | |
| 97 | |
| 98 rc = mciSendCommand( 0, MCI_OPEN, | |
| 99 iOpenMode, | |
| 100 (PVOID) &AmpOpenParms, 0); | |
| 101 if (rc!=MCIERR_SUCCESS) // No audio available?? | |
| 102 return (-1); | |
| 103 // Save the device ID we got from DART! | |
| 104 // We will use this in the next calls! | |
| 105 iDeviceOrd = AmpOpenParms.usDeviceID; | |
| 106 | |
| 107 // Determine the audio parameters from the AudioSpec | |
| 108 switch ( spec->format & 0xFF ) | |
| 109 { | |
| 110 case 8: | |
| 111 /* Unsigned 8 bit audio data */ | |
| 112 spec->format = AUDIO_U8; | |
| 113 iSilence = 0x80; | |
| 114 iBits = 8; | |
| 115 break; | |
| 116 case 16: | |
| 117 /* Signed 16 bit audio data */ | |
| 118 spec->format = AUDIO_S16; | |
| 119 iSilence = 0x00; | |
| 120 iBits = 16; | |
| 121 break; | |
| 122 default: | |
| 123 // Close DART, and exit with error code! | |
| 124 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 125 SDL_SetError("Unsupported audio format"); | |
| 126 return(-1); | |
| 127 } | |
| 128 iFreq = spec->freq; | |
| 129 iChannels = spec->channels; | |
| 130 /* Update the fragment size as size in bytes */ | |
| 131 SDL_CalculateAudioSpec(spec); | |
| 132 iBufSize = spec->size; | |
| 133 | |
| 134 // Now query this device if it supports the given freq/bits/channels! | |
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135 SDL_memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS)); |
| 1190 | 136 _this->hidden->MixSetupParms.ulBitsPerSample = iBits; |
| 137 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM; | |
| 138 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq; | |
| 139 _this->hidden->MixSetupParms.ulChannels = iChannels; | |
| 140 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY; | |
| 141 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO; | |
| 142 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc; | |
| 143 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP, | |
| 144 MCI_WAIT | MCI_MIXSETUP_QUERYMODE, | |
| 145 &(_this->hidden->MixSetupParms), 0); | |
| 146 if (rc!=MCIERR_SUCCESS) | |
| 147 { // The device cannot handle this format! | |
| 148 // Close DART, and exit with error code! | |
| 149 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 150 SDL_SetError("Audio device doesn't support requested audio format"); | |
| 151 return(-1); | |
| 152 } | |
| 153 // The device can handle this format, so initialize! | |
| 154 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP, | |
| 155 MCI_WAIT | MCI_MIXSETUP_INIT, | |
| 156 &(_this->hidden->MixSetupParms), 0); | |
| 157 if (rc!=MCIERR_SUCCESS) | |
| 158 { // The device could not be opened! | |
| 159 // Close DART, and exit with error code! | |
| 160 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 161 SDL_SetError("Audio device could not be set up"); | |
| 162 return(-1); | |
| 163 } | |
| 164 // Ok, the device is initialized. | |
| 165 // Now we should allocate buffers. For this, we need a place where | |
| 166 // the buffer descriptors will be: | |
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167 _this->hidden->pMixBuffers = (MCI_MIX_BUFFER *) SDL_malloc(sizeof(MCI_MIX_BUFFER)*iNumBufs); |
| 1190 | 168 if (!(_this->hidden->pMixBuffers)) |
| 169 { // Not enough memory! | |
| 170 // Close DART, and exit with error code! | |
| 171 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 172 SDL_SetError("Not enough memory for audio buffer descriptors"); | |
| 173 return(-1); | |
| 174 } | |
| 175 // Now that we have the place for buffer list, we can ask DART for the | |
| 176 // buffers! | |
| 177 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers | |
| 178 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size | |
| 179 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list | |
| 180 // Allocate buffers! | |
| 181 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER, | |
| 182 MCI_WAIT | MCI_ALLOCATE_MEMORY, | |
| 183 &(_this->hidden->BufferParms), 0); | |
| 184 if ((rc!=MCIERR_SUCCESS) || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers) || (_this->hidden->BufferParms.ulBufferSize==0)) | |
| 185 { // Could not allocate memory! | |
| 186 // Close DART, and exit with error code! | |
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187 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 188 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 189 SDL_SetError("DART could not allocate buffers"); | |
| 190 return(-1); | |
| 191 } | |
| 192 // Ok, we have all the buffers allocated, let's mark them! | |
| 193 { | |
| 194 int i; | |
| 195 for (i=0; i<iNumBufs; i++) | |
| 196 { | |
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197 pMixBufferDesc pBufferDesc = (pMixBufferDesc) SDL_malloc(sizeof(tMixBufferDesc));; |
| 1190 | 198 // Check if this buffer was really allocated by DART |
| 199 if ((!(_this->hidden->pMixBuffers[i].pBuffer)) || (!pBufferDesc)) | |
| 200 { // Wrong buffer! | |
| 201 // Close DART, and exit with error code! | |
| 202 // Free buffer descriptions | |
| 203 { int j; | |
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204 for (j=0; j<i; j++) SDL_free((void *)(_this->hidden->pMixBuffers[j].ulUserParm)); |
| 1190 | 205 } |
| 206 // and cleanup | |
| 207 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
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208 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 209 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 210 SDL_SetError("Error at internal buffer check"); | |
| 211 return(-1); | |
| 212 } | |
| 213 pBufferDesc->iBufferUsage = BUFFER_EMPTY; | |
| 214 pBufferDesc->pSDLAudioDevice = _this; | |
| 215 | |
| 216 _this->hidden->pMixBuffers[i].ulBufferLength = _this->hidden->BufferParms.ulBufferSize; | |
| 217 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer | |
| 218 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of | |
| 219 // audio data, but as we will continously send | |
| 220 // audio data, there will be no end.:) | |
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221 SDL_memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence, iBufSize); |
| 1190 | 222 } |
| 223 } | |
| 224 _this->hidden->iNextFreeBuffer = 0; | |
| 225 _this->hidden->iLastPlayedBuf = -1; | |
| 226 // Create event semaphore | |
| 227 if (DosCreateEventSem(NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE)!=NO_ERROR) | |
| 228 { | |
| 229 // Could not create event semaphore! | |
| 230 { | |
| 231 int i; | |
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232 for (i=0; i<iNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); |
| 1190 | 233 } |
| 234 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
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235 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 236 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 237 SDL_SetError("Could not create event semaphore"); | |
| 238 return(-1); | |
| 239 } | |
| 240 | |
| 241 // Store the new settings in global variables | |
| 242 _this->hidden->iCurrDeviceOrd = iDeviceOrd; | |
| 243 _this->hidden->iCurrFreq = iFreq; | |
| 244 _this->hidden->iCurrBits = iBits; | |
| 245 _this->hidden->iCurrChannels = iChannels; | |
| 246 _this->hidden->iCurrNumBufs = iNumBufs; | |
| 247 _this->hidden->iCurrBufSize = iBufSize; | |
| 248 | |
| 249 return (0); | |
| 250 } | |
| 251 | |
| 252 | |
| 253 | |
| 254 void DART_ThreadInit(_THIS) | |
| 255 { | |
| 256 return; | |
| 257 } | |
| 258 | |
| 259 /* This function waits until it is possible to write a full sound buffer */ | |
| 260 void DART_WaitAudio(_THIS) | |
| 261 { | |
| 262 int i; | |
| 263 pMixBufferDesc pBufDesc; | |
| 264 ULONG ulPostCount; | |
| 265 | |
| 266 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); | |
| 267 // If there is already an empty buffer, then return now! | |
| 268 for (i=0; i<_this->hidden->iCurrNumBufs; i++) | |
| 269 { | |
| 270 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm; | |
| 271 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) | |
| 272 return; | |
| 273 } | |
| 274 // If there is no empty buffer, wait for one to be empty! | |
| 275 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important! | |
| 276 return; | |
| 277 } | |
| 278 | |
| 279 void DART_PlayAudio(_THIS) | |
| 280 { | |
| 281 int iFreeBuf = _this->hidden->iNextFreeBuffer; | |
| 282 pMixBufferDesc pBufDesc; | |
| 283 | |
| 284 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; | |
| 285 pBufDesc->iBufferUsage = BUFFER_USED; | |
| 286 // Send it to DART to be queued | |
| 287 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.ulMixHandle, | |
| 288 &(_this->hidden->pMixBuffers[iFreeBuf]), 1); | |
| 289 | |
| 290 _this->hidden->iLastPlayedBuf = iFreeBuf; | |
| 291 iFreeBuf = (iFreeBuf+1) % _this->hidden->iCurrNumBufs; | |
| 292 _this->hidden->iNextFreeBuffer = iFreeBuf; | |
| 293 } | |
| 294 | |
| 295 Uint8 *DART_GetAudioBuf(_THIS) | |
| 296 { | |
| 297 int iFreeBuf; | |
| 298 Uint8 *pResult; | |
| 299 pMixBufferDesc pBufDesc; | |
| 300 | |
| 301 if (_this) | |
| 302 { | |
| 303 if (_this->hidden) | |
| 304 { | |
| 305 iFreeBuf = _this->hidden->iNextFreeBuffer; | |
| 306 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; | |
| 307 | |
| 308 if (pBufDesc) | |
| 309 { | |
| 310 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) | |
| 311 { | |
| 312 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer; | |
| 313 return pResult; | |
| 314 } | |
| 315 } else | |
| 316 printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n", pBufDesc); | |
| 317 } else | |
| 318 printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n", _this->hidden); | |
| 319 } else | |
| 320 printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this); | |
| 321 return NULL; | |
| 322 } | |
| 323 | |
| 324 void DART_WaitDone(_THIS) | |
| 325 { | |
| 326 pMixBufferDesc pBufDesc; | |
| 327 ULONG ulPostCount; | |
| 328 APIRET rc; | |
| 329 | |
| 330 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm; | |
| 331 rc = NO_ERROR; | |
| 332 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc==NO_ERROR)) | |
| 333 { | |
| 334 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); | |
| 335 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important! | |
| 336 } | |
| 337 } | |
| 338 | |
| 339 void DART_CloseAudio(_THIS) | |
| 340 { | |
| 341 MCI_GENERIC_PARMS GenericParms; | |
| 342 int rc; | |
| 343 | |
| 344 // Stop DART playback | |
| 345 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT, &GenericParms, 0); | |
| 346 if (rc!=MCIERR_SUCCESS) | |
| 347 { | |
| 348 #ifdef SFX_DEBUG_BUILD | |
| 349 printf("Could not stop DART playback!\n"); | |
| 350 fflush(stdout); | |
| 351 #endif | |
| 352 } | |
| 353 | |
| 354 // Close event semaphore | |
| 355 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed); | |
| 356 | |
| 357 // Free memory of buffer descriptions | |
| 358 { | |
| 359 int i; | |
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360 for (i=0; i<_this->hidden->iCurrNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); |
| 1190 | 361 } |
| 362 | |
| 363 // Deallocate buffers | |
| 364 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
| 365 | |
| 366 // Free bufferlist | |
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367 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 368 |
| 369 // Close dart | |
| 370 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT, &(GenericParms), 0); | |
| 371 } | |
| 372 | |
| 373 /* Audio driver bootstrap functions */ | |
| 374 | |
| 375 int Audio_Available(void) | |
| 376 { | |
| 377 return(1); | |
| 378 } | |
| 379 | |
| 380 void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 381 { | |
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382 SDL_free(device->hidden); |
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383 SDL_free(device); |
| 1190 | 384 } |
| 385 | |
| 386 SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 387 { | |
| 388 SDL_AudioDevice *this; | |
| 389 | |
| 390 /* Initialize all variables that we clean on shutdown */ | |
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391 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 1190 | 392 if ( this ) |
| 393 { | |
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394 SDL_memset(this, 0, (sizeof *this)); |
| 1190 | 395 this->hidden = (struct SDL_PrivateAudioData *) |
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396 SDL_malloc((sizeof *this->hidden)); |
| 1190 | 397 } |
| 398 if ( (this == NULL) || (this->hidden == NULL) ) | |
| 399 { | |
| 400 SDL_OutOfMemory(); | |
| 401 if ( this ) | |
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402 SDL_free(this); |
| 1190 | 403 return(0); |
| 404 } | |
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405 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 1190 | 406 |
| 407 /* Set the function pointers */ | |
| 408 this->OpenAudio = DART_OpenAudio; | |
| 409 this->ThreadInit = DART_ThreadInit; | |
| 410 this->WaitAudio = DART_WaitAudio; | |
| 411 this->PlayAudio = DART_PlayAudio; | |
| 412 this->GetAudioBuf = DART_GetAudioBuf; | |
| 413 this->WaitDone = DART_WaitDone; | |
| 414 this->CloseAudio = DART_CloseAudio; | |
| 415 | |
| 416 this->free = Audio_DeleteDevice; | |
| 417 | |
| 418 return this; | |
| 419 } | |
| 420 | |
| 421 AudioBootStrap DART_bootstrap = { | |
| 422 "dart", "OS/2 Direct Audio RouTines (DART)", | |
| 423 Audio_Available, Audio_CreateDevice | |
| 424 }; | |
| 425 |