Mercurial > sdl-ios-xcode
annotate src/audio/nas/SDL_nasaudio.c @ 453:a6fa62b1be09
Updated for embedded Visual C++ 4.0
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 20 Aug 2002 00:20:06 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 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 | |
|
252
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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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 */ | |
| 26 | |
| 27 #ifdef SAVE_RCSID | |
| 28 static char rcsid = | |
| 29 "@(#) $Id$"; | |
| 30 #endif | |
| 31 | |
| 32 /* Allow access to a raw mixing buffer */ | |
| 33 | |
| 34 #include <stdlib.h> | |
| 35 #include <stdio.h> | |
| 36 #include <string.h> | |
| 37 #include <errno.h> | |
| 38 #include <signal.h> | |
| 39 #include <unistd.h> | |
| 40 | |
| 41 #include "SDL_audio.h" | |
| 42 #include "SDL_error.h" | |
| 43 #include "SDL_audiomem.h" | |
| 44 #include "SDL_audio_c.h" | |
| 45 #include "SDL_timer.h" | |
| 46 #include "SDL_audiodev_c.h" | |
| 47 #include "SDL_nasaudio.h" | |
| 48 | |
| 49 /* The tag name used by artsc audio */ | |
| 50 #define NAS_DRIVER_NAME "nas" | |
| 51 | |
| 52 static struct SDL_PrivateAudioData *this2 = NULL; | |
| 53 | |
| 54 /* Audio driver functions */ | |
| 55 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 56 static void NAS_WaitAudio(_THIS); | |
| 57 static void NAS_PlayAudio(_THIS); | |
| 58 static Uint8 *NAS_GetAudioBuf(_THIS); | |
| 59 static void NAS_CloseAudio(_THIS); | |
| 60 | |
| 61 /* Audio driver bootstrap functions */ | |
| 62 | |
| 63 static int Audio_Available(void) | |
| 64 { | |
| 65 AuServer *aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 66 if (!aud) return 0; | |
| 67 | |
| 68 AuCloseServer(aud); | |
| 69 return 1; | |
| 70 } | |
| 71 | |
| 72 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 73 { | |
| 74 free(device->hidden); | |
| 75 free(device); | |
| 76 } | |
| 77 | |
| 78 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 79 { | |
| 80 SDL_AudioDevice *this; | |
| 81 | |
| 82 /* Initialize all variables that we clean on shutdown */ | |
| 83 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 84 if ( this ) { | |
| 85 memset(this, 0, (sizeof *this)); | |
| 86 this->hidden = (struct SDL_PrivateAudioData *) | |
| 87 malloc((sizeof *this->hidden)); | |
| 88 } | |
| 89 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 90 SDL_OutOfMemory(); | |
| 91 if ( this ) { | |
| 92 free(this); | |
| 93 } | |
| 94 return(0); | |
| 95 } | |
| 96 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 97 | |
| 98 /* Set the function pointers */ | |
| 99 this->OpenAudio = NAS_OpenAudio; | |
| 100 this->WaitAudio = NAS_WaitAudio; | |
| 101 this->PlayAudio = NAS_PlayAudio; | |
| 102 this->GetAudioBuf = NAS_GetAudioBuf; | |
| 103 this->CloseAudio = NAS_CloseAudio; | |
| 104 | |
| 105 this->free = Audio_DeleteDevice; | |
| 106 | |
| 107 return this; | |
| 108 } | |
| 109 | |
| 110 AudioBootStrap NAS_bootstrap = { | |
| 111 NAS_DRIVER_NAME, "Network Audio System", | |
| 112 Audio_Available, Audio_CreateDevice | |
| 113 }; | |
| 114 | |
| 115 /* This function waits until it is possible to write a full sound buffer */ | |
| 116 static void NAS_WaitAudio(_THIS) | |
| 117 { | |
| 118 while ( this->hidden->buf_free < this->hidden->mixlen ) { | |
| 119 AuEvent ev; | |
| 120 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 121 AuDispatchEvent(this->hidden->aud, &ev); | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 static void NAS_PlayAudio(_THIS) | |
| 126 { | |
| 127 while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events, | |
| 128 in the hope that some of them is LowWater events telling us more | |
| 129 of the buffer is free now than what we think. */ | |
| 130 AuEvent ev; | |
| 131 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 132 AuDispatchEvent(this->hidden->aud, &ev); | |
| 133 } | |
| 134 this->hidden->buf_free -= this->hidden->mixlen; | |
| 135 | |
| 136 /* Write the audio data */ | |
| 137 AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL); | |
| 138 | |
| 139 this->hidden->written += this->hidden->mixlen; | |
| 140 | |
| 141 #ifdef DEBUG_AUDIO | |
| 142 fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen); | |
| 143 #endif | |
| 144 } | |
| 145 | |
| 146 static Uint8 *NAS_GetAudioBuf(_THIS) | |
| 147 { | |
| 148 return(this->hidden->mixbuf); | |
| 149 } | |
| 150 | |
| 151 static void NAS_CloseAudio(_THIS) | |
| 152 { | |
| 153 if ( this->hidden->mixbuf != NULL ) { | |
| 154 SDL_FreeAudioMem(this->hidden->mixbuf); | |
| 155 this->hidden->mixbuf = NULL; | |
| 156 } | |
| 157 if ( this->hidden->aud ) { | |
| 158 AuCloseServer(this->hidden->aud); | |
| 159 this->hidden->aud = 0; | |
| 160 } | |
| 161 } | |
| 162 | |
| 163 static unsigned char sdlformat_to_auformat(unsigned int fmt) | |
| 164 { | |
| 165 switch (fmt) | |
| 166 { | |
| 167 case AUDIO_U8: | |
| 168 return AuFormatLinearUnsigned8; | |
| 169 case AUDIO_S8: | |
| 170 return AuFormatLinearSigned8; | |
| 171 case AUDIO_U16LSB: | |
| 172 return AuFormatLinearUnsigned16LSB; | |
| 173 case AUDIO_U16MSB: | |
| 174 return AuFormatLinearUnsigned16MSB; | |
| 175 case AUDIO_S16LSB: | |
| 176 return AuFormatLinearSigned16LSB; | |
| 177 case AUDIO_S16MSB: | |
| 178 return AuFormatLinearSigned16MSB; | |
| 179 } | |
| 180 return AuNone; | |
| 181 } | |
| 182 | |
| 183 static AuBool | |
| 184 event_handler(AuServer* aud, AuEvent* ev, AuEventHandlerRec* hnd) | |
| 185 { | |
| 186 switch (ev->type) { | |
| 187 case AuEventTypeElementNotify: { | |
| 188 AuElementNotifyEvent* event = (AuElementNotifyEvent *)ev; | |
| 189 | |
| 190 switch (event->kind) { | |
| 191 case AuElementNotifyKindLowWater: | |
| 192 if (this2->buf_free >= 0) { | |
| 193 this2->really += event->num_bytes; | |
| 194 gettimeofday(&this2->last_tv, 0); | |
| 195 this2->buf_free += event->num_bytes; | |
| 196 } else { | |
| 197 this2->buf_free = event->num_bytes; | |
| 198 } | |
| 199 break; | |
| 200 case AuElementNotifyKindState: | |
| 201 switch (event->cur_state) { | |
| 202 case AuStatePause: | |
| 203 if (event->reason != AuReasonUser) { | |
| 204 if (this2->buf_free >= 0) { | |
| 205 this2->really += event->num_bytes; | |
| 206 gettimeofday(&this2->last_tv, 0); | |
| 207 this2->buf_free += event->num_bytes; | |
| 208 } else { | |
| 209 this2->buf_free = event->num_bytes; | |
| 210 } | |
| 211 } | |
| 212 break; | |
| 213 } | |
| 214 } | |
| 215 } | |
| 216 } | |
| 217 return AuTrue; | |
| 218 } | |
| 219 | |
| 220 static AuDeviceID | |
| 221 find_device(_THIS, int nch) | |
| 222 { | |
| 223 int i; | |
| 224 for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) { | |
| 225 if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) == | |
| 226 AuComponentKindPhysicalOutput) && | |
| 227 AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) { | |
| 228 return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i)); | |
| 229 } | |
| 230 } | |
| 231 return AuNone; | |
| 232 } | |
| 233 | |
| 234 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 235 { | |
| 236 AuElement elms[3]; | |
| 237 int buffer_size; | |
| 238 Uint16 test_format, format; | |
| 239 | |
| 240 this->hidden->mixbuf = NULL; | |
| 241 | |
| 242 /* Try for a closest match on audio format */ | |
| 243 format = 0; | |
| 244 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 245 ! format && test_format; ) { | |
| 246 format = sdlformat_to_auformat(test_format); | |
| 247 | |
| 248 if (format == AuNone) { | |
| 249 test_format = SDL_NextAudioFormat(); | |
| 250 } | |
| 251 } | |
| 252 if ( format == 0 ) { | |
| 253 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 254 return(-1); | |
| 255 } | |
| 256 spec->format = test_format; | |
| 257 | |
| 258 this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 259 if (this->hidden->aud == 0) | |
| 260 { | |
| 261 SDL_SetError("Couldn't open connection to NAS server"); | |
| 262 return (-1); | |
| 263 } | |
| 264 | |
| 265 this->hidden->dev = find_device(this, spec->channels); | |
| 266 if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) { | |
| 267 AuCloseServer(this->hidden->aud); | |
| 268 this->hidden->aud = 0; | |
| 269 SDL_SetError("Couldn't find a fitting playback device on NAS server"); | |
| 270 return (-1); | |
| 271 } | |
| 272 | |
| 273 buffer_size = spec->freq; | |
| 274 if (buffer_size < 4096) | |
| 275 buffer_size = 4096; | |
| 276 | |
| 277 if (buffer_size > 32768) | |
| 278 buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ | |
| 279 | |
| 280 /* Calculate the final parameters for this audio specification */ | |
| 281 SDL_CalculateAudioSpec(spec); | |
| 282 | |
| 283 this2 = this->hidden; | |
| 284 | |
| 285 AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue, | |
| 286 buffer_size, buffer_size / 4, 0, NULL); | |
| 287 AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq, | |
| 288 AuUnlimitedSamples, 0, NULL); | |
| 289 AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); | |
| 290 AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, | |
| 291 event_handler, (AuPointer) NULL); | |
| 292 | |
| 293 AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); | |
| 294 | |
| 295 /* Allocate mixing buffer */ | |
| 296 this->hidden->mixlen = spec->size; | |
| 297 this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen); | |
| 298 if ( this->hidden->mixbuf == NULL ) { | |
| 299 return(-1); | |
| 300 } | |
| 301 memset(this->hidden->mixbuf, spec->silence, spec->size); | |
| 302 | |
| 303 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 304 this->hidden->parent = getpid(); | |
| 305 | |
| 306 /* We're ready to rock and roll. :-) */ | |
| 307 return(0); | |
| 308 } |