Mercurial > sdl-ios-xcode
annotate src/audio/nas/SDL_nasaudio.c @ 1538:b1f8c14f0df5
*** empty log message ***
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Mar 2006 03:50:34 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 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 |
| 0 | 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. |
| 0 | 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. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
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16 License along with this library; if not, write to the Free Software |
|
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parents:
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 |
| 22 This driver was written by: | |
| 23 Erik Inge Bolsų | |
| 24 knan@mo.himolde.no | |
| 25 */ | |
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26 #include "SDL_config.h" |
| 0 | 27 |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 | |
| 30 #include <signal.h> | |
| 31 #include <unistd.h> | |
| 32 | |
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33 #include "SDL_timer.h" |
| 0 | 34 #include "SDL_audio.h" |
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35 #include "../SDL_audiomem.h" |
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36 #include "../SDL_audio_c.h" |
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37 #include "../SDL_audiodev_c.h" |
| 0 | 38 #include "SDL_nasaudio.h" |
| 39 | |
| 40 /* The tag name used by artsc audio */ | |
| 41 #define NAS_DRIVER_NAME "nas" | |
| 42 | |
| 43 static struct SDL_PrivateAudioData *this2 = NULL; | |
| 44 | |
| 45 /* Audio driver functions */ | |
| 46 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 47 static void NAS_WaitAudio(_THIS); | |
| 48 static void NAS_PlayAudio(_THIS); | |
| 49 static Uint8 *NAS_GetAudioBuf(_THIS); | |
| 50 static void NAS_CloseAudio(_THIS); | |
| 51 | |
| 52 /* Audio driver bootstrap functions */ | |
| 53 | |
| 54 static int Audio_Available(void) | |
| 55 { | |
| 56 AuServer *aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 57 if (!aud) return 0; | |
| 58 | |
| 59 AuCloseServer(aud); | |
| 60 return 1; | |
| 61 } | |
| 62 | |
| 63 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 64 { | |
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65 SDL_free(device->hidden); |
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66 SDL_free(device); |
| 0 | 67 } |
| 68 | |
| 69 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 70 { | |
| 71 SDL_AudioDevice *this; | |
| 72 | |
| 73 /* Initialize all variables that we clean on shutdown */ | |
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74 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 75 if ( this ) { |
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76 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 77 this->hidden = (struct SDL_PrivateAudioData *) |
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78 SDL_malloc((sizeof *this->hidden)); |
| 0 | 79 } |
| 80 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 81 SDL_OutOfMemory(); | |
| 82 if ( this ) { | |
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83 SDL_free(this); |
| 0 | 84 } |
| 85 return(0); | |
| 86 } | |
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87 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 88 |
| 89 /* Set the function pointers */ | |
| 90 this->OpenAudio = NAS_OpenAudio; | |
| 91 this->WaitAudio = NAS_WaitAudio; | |
| 92 this->PlayAudio = NAS_PlayAudio; | |
| 93 this->GetAudioBuf = NAS_GetAudioBuf; | |
| 94 this->CloseAudio = NAS_CloseAudio; | |
| 95 | |
| 96 this->free = Audio_DeleteDevice; | |
| 97 | |
| 98 return this; | |
| 99 } | |
| 100 | |
| 101 AudioBootStrap NAS_bootstrap = { | |
| 102 NAS_DRIVER_NAME, "Network Audio System", | |
| 103 Audio_Available, Audio_CreateDevice | |
| 104 }; | |
| 105 | |
| 106 /* This function waits until it is possible to write a full sound buffer */ | |
| 107 static void NAS_WaitAudio(_THIS) | |
| 108 { | |
| 109 while ( this->hidden->buf_free < this->hidden->mixlen ) { | |
| 110 AuEvent ev; | |
| 111 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 112 AuDispatchEvent(this->hidden->aud, &ev); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 static void NAS_PlayAudio(_THIS) | |
| 117 { | |
| 118 while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events, | |
| 119 in the hope that some of them is LowWater events telling us more | |
| 120 of the buffer is free now than what we think. */ | |
| 121 AuEvent ev; | |
| 122 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 123 AuDispatchEvent(this->hidden->aud, &ev); | |
| 124 } | |
| 125 this->hidden->buf_free -= this->hidden->mixlen; | |
| 126 | |
| 127 /* Write the audio data */ | |
| 128 AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL); | |
| 129 | |
| 130 this->hidden->written += this->hidden->mixlen; | |
| 131 | |
| 132 #ifdef DEBUG_AUDIO | |
| 133 fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen); | |
| 134 #endif | |
| 135 } | |
| 136 | |
| 137 static Uint8 *NAS_GetAudioBuf(_THIS) | |
| 138 { | |
| 139 return(this->hidden->mixbuf); | |
| 140 } | |
| 141 | |
| 142 static void NAS_CloseAudio(_THIS) | |
| 143 { | |
| 144 if ( this->hidden->mixbuf != NULL ) { | |
| 145 SDL_FreeAudioMem(this->hidden->mixbuf); | |
| 146 this->hidden->mixbuf = NULL; | |
| 147 } | |
| 148 if ( this->hidden->aud ) { | |
| 149 AuCloseServer(this->hidden->aud); | |
| 150 this->hidden->aud = 0; | |
| 151 } | |
| 152 } | |
| 153 | |
| 154 static unsigned char sdlformat_to_auformat(unsigned int fmt) | |
| 155 { | |
| 156 switch (fmt) | |
| 157 { | |
| 158 case AUDIO_U8: | |
| 159 return AuFormatLinearUnsigned8; | |
| 160 case AUDIO_S8: | |
| 161 return AuFormatLinearSigned8; | |
| 162 case AUDIO_U16LSB: | |
| 163 return AuFormatLinearUnsigned16LSB; | |
| 164 case AUDIO_U16MSB: | |
| 165 return AuFormatLinearUnsigned16MSB; | |
| 166 case AUDIO_S16LSB: | |
| 167 return AuFormatLinearSigned16LSB; | |
| 168 case AUDIO_S16MSB: | |
| 169 return AuFormatLinearSigned16MSB; | |
| 170 } | |
| 171 return AuNone; | |
| 172 } | |
| 173 | |
| 174 static AuBool | |
| 175 event_handler(AuServer* aud, AuEvent* ev, AuEventHandlerRec* hnd) | |
| 176 { | |
| 177 switch (ev->type) { | |
| 178 case AuEventTypeElementNotify: { | |
| 179 AuElementNotifyEvent* event = (AuElementNotifyEvent *)ev; | |
| 180 | |
| 181 switch (event->kind) { | |
| 182 case AuElementNotifyKindLowWater: | |
| 183 if (this2->buf_free >= 0) { | |
| 184 this2->really += event->num_bytes; | |
| 185 gettimeofday(&this2->last_tv, 0); | |
| 186 this2->buf_free += event->num_bytes; | |
| 187 } else { | |
| 188 this2->buf_free = event->num_bytes; | |
| 189 } | |
| 190 break; | |
| 191 case AuElementNotifyKindState: | |
| 192 switch (event->cur_state) { | |
| 193 case AuStatePause: | |
| 194 if (event->reason != AuReasonUser) { | |
| 195 if (this2->buf_free >= 0) { | |
| 196 this2->really += event->num_bytes; | |
| 197 gettimeofday(&this2->last_tv, 0); | |
| 198 this2->buf_free += event->num_bytes; | |
| 199 } else { | |
| 200 this2->buf_free = event->num_bytes; | |
| 201 } | |
| 202 } | |
| 203 break; | |
| 204 } | |
| 205 } | |
| 206 } | |
| 207 } | |
| 208 return AuTrue; | |
| 209 } | |
| 210 | |
| 211 static AuDeviceID | |
| 212 find_device(_THIS, int nch) | |
| 213 { | |
| 214 int i; | |
| 215 for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) { | |
| 216 if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) == | |
| 217 AuComponentKindPhysicalOutput) && | |
| 218 AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) { | |
| 219 return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i)); | |
| 220 } | |
| 221 } | |
| 222 return AuNone; | |
| 223 } | |
| 224 | |
| 225 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 226 { | |
| 227 AuElement elms[3]; | |
| 228 int buffer_size; | |
| 229 Uint16 test_format, format; | |
| 230 | |
| 231 this->hidden->mixbuf = NULL; | |
| 232 | |
| 233 /* Try for a closest match on audio format */ | |
| 234 format = 0; | |
| 235 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 236 ! format && test_format; ) { | |
| 237 format = sdlformat_to_auformat(test_format); | |
| 238 | |
| 239 if (format == AuNone) { | |
| 240 test_format = SDL_NextAudioFormat(); | |
| 241 } | |
| 242 } | |
| 243 if ( format == 0 ) { | |
| 244 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 245 return(-1); | |
| 246 } | |
| 247 spec->format = test_format; | |
| 248 | |
| 249 this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 250 if (this->hidden->aud == 0) | |
| 251 { | |
| 252 SDL_SetError("Couldn't open connection to NAS server"); | |
| 253 return (-1); | |
| 254 } | |
| 255 | |
| 256 this->hidden->dev = find_device(this, spec->channels); | |
| 257 if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) { | |
| 258 AuCloseServer(this->hidden->aud); | |
| 259 this->hidden->aud = 0; | |
| 260 SDL_SetError("Couldn't find a fitting playback device on NAS server"); | |
| 261 return (-1); | |
| 262 } | |
| 263 | |
| 264 buffer_size = spec->freq; | |
| 265 if (buffer_size < 4096) | |
| 266 buffer_size = 4096; | |
| 267 | |
| 268 if (buffer_size > 32768) | |
| 269 buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ | |
| 270 | |
| 271 /* Calculate the final parameters for this audio specification */ | |
| 272 SDL_CalculateAudioSpec(spec); | |
| 273 | |
| 274 this2 = this->hidden; | |
| 275 | |
| 276 AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue, | |
| 277 buffer_size, buffer_size / 4, 0, NULL); | |
| 278 AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq, | |
| 279 AuUnlimitedSamples, 0, NULL); | |
| 280 AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); | |
| 281 AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, | |
| 282 event_handler, (AuPointer) NULL); | |
| 283 | |
| 284 AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); | |
| 285 | |
| 286 /* Allocate mixing buffer */ | |
| 287 this->hidden->mixlen = spec->size; | |
| 288 this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen); | |
| 289 if ( this->hidden->mixbuf == NULL ) { | |
| 290 return(-1); | |
| 291 } | |
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292 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); |
| 0 | 293 |
| 294 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 295 this->hidden->parent = getpid(); | |
| 296 | |
| 297 /* We're ready to rock and roll. :-) */ | |
| 298 return(0); | |
| 299 } |