Mercurial > sdl-ios-xcode
annotate src/audio/dart/SDL_dart.c @ 3851:405a192b68e7 SDL-1.2
Backport from 1.3: most of the audio drivers can now handle data
conversion at a higher level when they can't open the hardware in the
exact format requested.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 01 Sep 2006 22:50:24 +0000 |
| parents | d910939febfa |
| children | 5b5e549382b3 |
| 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 */ | |
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22 #include "SDL_config.h" |
| 1190 | 23 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
| 26 #include "SDL_timer.h" | |
| 27 #include "SDL_audio.h" | |
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28 #include "../SDL_audio_c.h" |
| 1190 | 29 #include "SDL_dart.h" |
| 30 | |
| 31 // Buffer states: | |
| 32 #define BUFFER_EMPTY 0 | |
| 33 #define BUFFER_USED 1 | |
| 34 | |
| 35 typedef struct _tMixBufferDesc { | |
| 36 int iBufferUsage; // BUFFER_EMPTY or BUFFER_USED | |
| 37 SDL_AudioDevice *pSDLAudioDevice; | |
| 38 } tMixBufferDesc, *pMixBufferDesc; | |
| 39 | |
| 40 | |
| 41 //--------------------------------------------------------------------- | |
| 42 // DARTEventFunc | |
| 43 // | |
| 44 // This function is called by DART, when an event occures, like end of | |
| 45 // playback of a buffer, etc... | |
| 46 //--------------------------------------------------------------------- | |
| 47 LONG APIENTRY DARTEventFunc(ULONG ulStatus, | |
| 48 PMCI_MIX_BUFFER pBuffer, | |
| 49 ULONG ulFlags) | |
| 50 { | |
| 51 if (ulFlags && MIX_WRITE_COMPLETE) | |
| 52 { // Playback of buffer completed! | |
| 53 | |
| 54 // Get pointer to buffer description | |
| 55 pMixBufferDesc pBufDesc; | |
| 56 | |
| 57 if (pBuffer) | |
| 58 { | |
| 59 pBufDesc = (pMixBufferDesc) (*pBuffer).ulUserParm; | |
| 60 | |
| 61 if (pBufDesc) | |
| 62 { | |
| 63 SDL_AudioDevice *pSDLAudioDevice = pBufDesc->pSDLAudioDevice; | |
| 64 // Set the buffer to be empty | |
| 65 pBufDesc->iBufferUsage = BUFFER_EMPTY; | |
| 66 // And notify DART feeder thread that it will have to work a bit. | |
| 67 if (pSDLAudioDevice) | |
| 68 DosPostEventSem(pSDLAudioDevice->hidden->hevAudioBufferPlayed); | |
| 69 } | |
| 70 } | |
| 71 } | |
| 72 return TRUE; | |
| 73 } | |
| 74 | |
| 75 | |
| 76 int DART_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 77 { | |
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78 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format); |
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79 int valid_datatype = 0; |
| 1190 | 80 MCI_AMP_OPEN_PARMS AmpOpenParms; |
| 81 MCI_GENERIC_PARMS GenericParms; | |
| 82 int iDeviceOrd = 0; // Default device to be used | |
| 83 int bOpenShared = 1; // Try opening it shared | |
| 84 int iBits = 16; // Default is 16 bits signed | |
| 85 int iFreq = 44100; // Default is 44KHz | |
| 86 int iChannels = 2; // Default is 2 channels (Stereo) | |
| 87 int iNumBufs = 2; // Number of audio buffers: 2 | |
| 88 int iBufSize; | |
| 89 int iOpenMode; | |
| 90 int iSilence; | |
| 91 int rc; | |
| 92 | |
| 93 // First thing is to try to open a given DART device! | |
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94 SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS)); |
| 1190 | 95 // pszDeviceType should contain the device type in low word, and device ordinal in high word! |
| 96 AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16)); | |
| 97 | |
| 98 iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID; | |
| 99 if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE; | |
| 100 | |
| 101 rc = mciSendCommand( 0, MCI_OPEN, | |
| 102 iOpenMode, | |
| 103 (PVOID) &AmpOpenParms, 0); | |
| 104 if (rc!=MCIERR_SUCCESS) // No audio available?? | |
| 105 return (-1); | |
| 106 // Save the device ID we got from DART! | |
| 107 // We will use this in the next calls! | |
| 108 iDeviceOrd = AmpOpenParms.usDeviceID; | |
| 109 | |
| 110 // Determine the audio parameters from the AudioSpec | |
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111 if (spec->channels > 2) |
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112 spec->channels = 2; // !!! FIXME: more than stereo support in OS/2? |
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113 |
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114 while ((!valid_datatype) && (test_format)) { |
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115 spec->format = test_format; |
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116 valid_datatype = 1; |
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117 switch (test_format) { |
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118 case AUDIO_U8: |
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119 // Unsigned 8 bit audio data |
| 1190 | 120 iSilence = 0x80; |
| 121 iBits = 8; | |
| 122 break; | |
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123 |
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124 case AUDIO_S16LSB: |
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125 // Signed 16 bit audio data |
| 1190 | 126 iSilence = 0x00; |
| 127 iBits = 16; | |
| 128 break; | |
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129 |
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130 default: |
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131 valid_datatype = 0; |
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132 test_format = SDL_NextAudioFormat(); |
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133 break; |
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134 } |
| 1190 | 135 } |
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136 |
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137 if (!valid_datatype) { // shouldn't happen, but just in case... |
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138 // Close DART, and exit with error code! |
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139 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
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140 SDL_SetError("Unsupported audio format"); |
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141 return (-1); |
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142 } |
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143 |
| 1190 | 144 iFreq = spec->freq; |
| 145 iChannels = spec->channels; | |
| 146 /* Update the fragment size as size in bytes */ | |
| 147 SDL_CalculateAudioSpec(spec); | |
| 148 iBufSize = spec->size; | |
| 149 | |
| 150 // Now query this device if it supports the given freq/bits/channels! | |
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151 SDL_memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS)); |
| 1190 | 152 _this->hidden->MixSetupParms.ulBitsPerSample = iBits; |
| 153 _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM; | |
| 154 _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq; | |
| 155 _this->hidden->MixSetupParms.ulChannels = iChannels; | |
| 156 _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY; | |
| 157 _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO; | |
| 158 _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc; | |
| 159 rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP, | |
| 160 MCI_WAIT | MCI_MIXSETUP_QUERYMODE, | |
| 161 &(_this->hidden->MixSetupParms), 0); | |
| 162 if (rc!=MCIERR_SUCCESS) | |
| 163 { // The device cannot handle this format! | |
| 164 // Close DART, and exit with error code! | |
| 165 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 166 SDL_SetError("Audio device doesn't support requested audio format"); | |
| 167 return(-1); | |
| 168 } | |
| 169 // The device can handle this format, so initialize! | |
| 170 rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP, | |
| 171 MCI_WAIT | MCI_MIXSETUP_INIT, | |
| 172 &(_this->hidden->MixSetupParms), 0); | |
| 173 if (rc!=MCIERR_SUCCESS) | |
| 174 { // The device could not be opened! | |
| 175 // Close DART, and exit with error code! | |
| 176 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 177 SDL_SetError("Audio device could not be set up"); | |
| 178 return(-1); | |
| 179 } | |
| 180 // Ok, the device is initialized. | |
| 181 // Now we should allocate buffers. For this, we need a place where | |
| 182 // the buffer descriptors will be: | |
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183 _this->hidden->pMixBuffers = (MCI_MIX_BUFFER *) SDL_malloc(sizeof(MCI_MIX_BUFFER)*iNumBufs); |
| 1190 | 184 if (!(_this->hidden->pMixBuffers)) |
| 185 { // Not enough memory! | |
| 186 // Close DART, and exit with error code! | |
| 187 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); | |
| 188 SDL_SetError("Not enough memory for audio buffer descriptors"); | |
| 189 return(-1); | |
| 190 } | |
| 191 // Now that we have the place for buffer list, we can ask DART for the | |
| 192 // buffers! | |
| 193 _this->hidden->BufferParms.ulNumBuffers = iNumBufs; // Number of buffers | |
| 194 _this->hidden->BufferParms.ulBufferSize = iBufSize; // each with this size | |
| 195 _this->hidden->BufferParms.pBufList = _this->hidden->pMixBuffers; // getting descriptorts into this list | |
| 196 // Allocate buffers! | |
| 197 rc = mciSendCommand(iDeviceOrd, MCI_BUFFER, | |
| 198 MCI_WAIT | MCI_ALLOCATE_MEMORY, | |
| 199 &(_this->hidden->BufferParms), 0); | |
| 200 if ((rc!=MCIERR_SUCCESS) || (iNumBufs != _this->hidden->BufferParms.ulNumBuffers) || (_this->hidden->BufferParms.ulBufferSize==0)) | |
| 201 { // Could not allocate memory! | |
| 202 // Close DART, and exit with error code! | |
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203 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 204 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 205 SDL_SetError("DART could not allocate buffers"); | |
| 206 return(-1); | |
| 207 } | |
| 208 // Ok, we have all the buffers allocated, let's mark them! | |
| 209 { | |
| 210 int i; | |
| 211 for (i=0; i<iNumBufs; i++) | |
| 212 { | |
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213 pMixBufferDesc pBufferDesc = (pMixBufferDesc) SDL_malloc(sizeof(tMixBufferDesc));; |
| 1190 | 214 // Check if this buffer was really allocated by DART |
| 215 if ((!(_this->hidden->pMixBuffers[i].pBuffer)) || (!pBufferDesc)) | |
| 216 { // Wrong buffer! | |
| 217 // Close DART, and exit with error code! | |
| 218 // Free buffer descriptions | |
| 219 { int j; | |
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220 for (j=0; j<i; j++) SDL_free((void *)(_this->hidden->pMixBuffers[j].ulUserParm)); |
| 1190 | 221 } |
| 222 // and cleanup | |
| 223 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
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224 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 225 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 226 SDL_SetError("Error at internal buffer check"); | |
| 227 return(-1); | |
| 228 } | |
| 229 pBufferDesc->iBufferUsage = BUFFER_EMPTY; | |
| 230 pBufferDesc->pSDLAudioDevice = _this; | |
| 231 | |
| 232 _this->hidden->pMixBuffers[i].ulBufferLength = _this->hidden->BufferParms.ulBufferSize; | |
| 233 _this->hidden->pMixBuffers[i].ulUserParm = (ULONG) pBufferDesc; // User parameter: Description of buffer | |
| 234 _this->hidden->pMixBuffers[i].ulFlags = 0; // Some stuff should be flagged here for DART, like end of | |
| 235 // audio data, but as we will continously send | |
| 236 // audio data, there will be no end.:) | |
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237 SDL_memset(_this->hidden->pMixBuffers[i].pBuffer, iSilence, iBufSize); |
| 1190 | 238 } |
| 239 } | |
| 240 _this->hidden->iNextFreeBuffer = 0; | |
| 241 _this->hidden->iLastPlayedBuf = -1; | |
| 242 // Create event semaphore | |
| 243 if (DosCreateEventSem(NULL, &(_this->hidden->hevAudioBufferPlayed), 0, FALSE)!=NO_ERROR) | |
| 244 { | |
| 245 // Could not create event semaphore! | |
| 246 { | |
| 247 int i; | |
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248 for (i=0; i<iNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); |
| 1190 | 249 } |
| 250 mciSendCommand(iDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
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251 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 252 mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0); |
| 253 SDL_SetError("Could not create event semaphore"); | |
| 254 return(-1); | |
| 255 } | |
| 256 | |
| 257 // Store the new settings in global variables | |
| 258 _this->hidden->iCurrDeviceOrd = iDeviceOrd; | |
| 259 _this->hidden->iCurrFreq = iFreq; | |
| 260 _this->hidden->iCurrBits = iBits; | |
| 261 _this->hidden->iCurrChannels = iChannels; | |
| 262 _this->hidden->iCurrNumBufs = iNumBufs; | |
| 263 _this->hidden->iCurrBufSize = iBufSize; | |
| 264 | |
| 265 return (0); | |
| 266 } | |
| 267 | |
| 268 | |
| 269 | |
| 270 void DART_ThreadInit(_THIS) | |
| 271 { | |
| 272 return; | |
| 273 } | |
| 274 | |
| 275 /* This function waits until it is possible to write a full sound buffer */ | |
| 276 void DART_WaitAudio(_THIS) | |
| 277 { | |
| 278 int i; | |
| 279 pMixBufferDesc pBufDesc; | |
| 280 ULONG ulPostCount; | |
| 281 | |
| 282 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); | |
| 283 // If there is already an empty buffer, then return now! | |
| 284 for (i=0; i<_this->hidden->iCurrNumBufs; i++) | |
| 285 { | |
| 286 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[i].ulUserParm; | |
| 287 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) | |
| 288 return; | |
| 289 } | |
| 290 // If there is no empty buffer, wait for one to be empty! | |
| 291 DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // Wait max 1 sec!!! Important! | |
| 292 return; | |
| 293 } | |
| 294 | |
| 295 void DART_PlayAudio(_THIS) | |
| 296 { | |
| 297 int iFreeBuf = _this->hidden->iNextFreeBuffer; | |
| 298 pMixBufferDesc pBufDesc; | |
| 299 | |
| 300 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; | |
| 301 pBufDesc->iBufferUsage = BUFFER_USED; | |
| 302 // Send it to DART to be queued | |
| 303 _this->hidden->MixSetupParms.pmixWrite(_this->hidden->MixSetupParms.ulMixHandle, | |
| 304 &(_this->hidden->pMixBuffers[iFreeBuf]), 1); | |
| 305 | |
| 306 _this->hidden->iLastPlayedBuf = iFreeBuf; | |
| 307 iFreeBuf = (iFreeBuf+1) % _this->hidden->iCurrNumBufs; | |
| 308 _this->hidden->iNextFreeBuffer = iFreeBuf; | |
| 309 } | |
| 310 | |
| 311 Uint8 *DART_GetAudioBuf(_THIS) | |
| 312 { | |
| 313 int iFreeBuf; | |
| 314 Uint8 *pResult; | |
| 315 pMixBufferDesc pBufDesc; | |
| 316 | |
| 317 if (_this) | |
| 318 { | |
| 319 if (_this->hidden) | |
| 320 { | |
| 321 iFreeBuf = _this->hidden->iNextFreeBuffer; | |
| 322 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[iFreeBuf].ulUserParm; | |
| 323 | |
| 324 if (pBufDesc) | |
| 325 { | |
| 326 if (pBufDesc->iBufferUsage == BUFFER_EMPTY) | |
| 327 { | |
| 328 pResult = _this->hidden->pMixBuffers[iFreeBuf].pBuffer; | |
| 329 return pResult; | |
| 330 } | |
| 331 } else | |
| 332 printf("[DART_GetAudioBuf] : ERROR! pBufDesc = %p\n", pBufDesc); | |
| 333 } else | |
| 334 printf("[DART_GetAudioBuf] : ERROR! _this->hidden = %p\n", _this->hidden); | |
| 335 } else | |
| 336 printf("[DART_GetAudioBuf] : ERROR! _this = %p\n", _this); | |
| 337 return NULL; | |
| 338 } | |
| 339 | |
| 340 void DART_WaitDone(_THIS) | |
| 341 { | |
| 342 pMixBufferDesc pBufDesc; | |
| 343 ULONG ulPostCount; | |
| 344 APIRET rc; | |
| 345 | |
| 346 pBufDesc = (pMixBufferDesc) _this->hidden->pMixBuffers[_this->hidden->iLastPlayedBuf].ulUserParm; | |
| 347 rc = NO_ERROR; | |
| 348 while ((pBufDesc->iBufferUsage != BUFFER_EMPTY) && (rc==NO_ERROR)) | |
| 349 { | |
| 350 DosResetEventSem(_this->hidden->hevAudioBufferPlayed, &ulPostCount); | |
| 351 rc = DosWaitEventSem(_this->hidden->hevAudioBufferPlayed, 1000); // 1 sec timeout! Important! | |
| 352 } | |
| 353 } | |
| 354 | |
| 355 void DART_CloseAudio(_THIS) | |
| 356 { | |
| 357 MCI_GENERIC_PARMS GenericParms; | |
| 358 int rc; | |
| 359 | |
| 360 // Stop DART playback | |
| 361 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_STOP, MCI_WAIT, &GenericParms, 0); | |
| 362 if (rc!=MCIERR_SUCCESS) | |
| 363 { | |
| 364 #ifdef SFX_DEBUG_BUILD | |
| 365 printf("Could not stop DART playback!\n"); | |
| 366 fflush(stdout); | |
| 367 #endif | |
| 368 } | |
| 369 | |
| 370 // Close event semaphore | |
| 371 DosCloseEventSem(_this->hidden->hevAudioBufferPlayed); | |
| 372 | |
| 373 // Free memory of buffer descriptions | |
| 374 { | |
| 375 int i; | |
|
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376 for (i=0; i<_this->hidden->iCurrNumBufs; i++) SDL_free((void *)(_this->hidden->pMixBuffers[i].ulUserParm)); |
| 1190 | 377 } |
| 378 | |
| 379 // Deallocate buffers | |
| 380 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_BUFFER, MCI_WAIT | MCI_DEALLOCATE_MEMORY, &(_this->hidden->BufferParms), 0); | |
| 381 | |
| 382 // Free bufferlist | |
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383 SDL_free(_this->hidden->pMixBuffers); _this->hidden->pMixBuffers = NULL; |
| 1190 | 384 |
| 385 // Close dart | |
| 386 rc = mciSendCommand(_this->hidden->iCurrDeviceOrd, MCI_CLOSE, MCI_WAIT, &(GenericParms), 0); | |
| 387 } | |
| 388 | |
| 389 /* Audio driver bootstrap functions */ | |
| 390 | |
| 391 int Audio_Available(void) | |
| 392 { | |
| 393 return(1); | |
| 394 } | |
| 395 | |
| 396 void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 397 { | |
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398 SDL_free(device->hidden); |
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399 SDL_free(device); |
| 1190 | 400 } |
| 401 | |
| 402 SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 403 { | |
| 404 SDL_AudioDevice *this; | |
| 405 | |
| 406 /* Initialize all variables that we clean on shutdown */ | |
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407 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 1190 | 408 if ( this ) |
| 409 { | |
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410 SDL_memset(this, 0, (sizeof *this)); |
| 1190 | 411 this->hidden = (struct SDL_PrivateAudioData *) |
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412 SDL_malloc((sizeof *this->hidden)); |
| 1190 | 413 } |
| 414 if ( (this == NULL) || (this->hidden == NULL) ) | |
| 415 { | |
| 416 SDL_OutOfMemory(); | |
| 417 if ( this ) | |
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418 SDL_free(this); |
| 1190 | 419 return(0); |
| 420 } | |
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421 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 1190 | 422 |
| 423 /* Set the function pointers */ | |
| 424 this->OpenAudio = DART_OpenAudio; | |
| 425 this->ThreadInit = DART_ThreadInit; | |
| 426 this->WaitAudio = DART_WaitAudio; | |
| 427 this->PlayAudio = DART_PlayAudio; | |
| 428 this->GetAudioBuf = DART_GetAudioBuf; | |
| 429 this->WaitDone = DART_WaitDone; | |
| 430 this->CloseAudio = DART_CloseAudio; | |
| 431 | |
| 432 this->free = Audio_DeleteDevice; | |
| 433 | |
| 434 return this; | |
| 435 } | |
| 436 | |
| 437 AudioBootStrap DART_bootstrap = { | |
| 438 "dart", "OS/2 Direct Audio RouTines (DART)", | |
| 439 Audio_Available, Audio_CreateDevice | |
| 440 }; | |
| 441 |