Mercurial > sdl-ios-xcode
annotate src/audio/nas/SDL_nasaudio.c @ 1336:3692456e7b0f
Use SDL_ prefixed versions of C library functions.
FIXME:
Change #include <stdlib.h> to #include "SDL_stdlib.h"
Change #include <string.h> to #include "SDL_string.h"
Make sure nothing else broke because of this...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 06:59:48 +0000 |
| parents | c9b51268668f |
| children | 604d73db6802 |
| 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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parents:
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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 |
| 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 */ | |
| 26 | |
| 27 /* Allow access to a raw mixing buffer */ | |
| 28 | |
| 29 #include <stdlib.h> | |
| 30 #include <stdio.h> | |
| 31 #include <string.h> | |
| 32 #include <errno.h> | |
| 33 #include <signal.h> | |
| 34 #include <unistd.h> | |
| 35 | |
| 36 #include "SDL_audio.h" | |
| 37 #include "SDL_error.h" | |
| 38 #include "SDL_audiomem.h" | |
| 39 #include "SDL_audio_c.h" | |
| 40 #include "SDL_timer.h" | |
| 41 #include "SDL_audiodev_c.h" | |
| 42 #include "SDL_nasaudio.h" | |
| 43 | |
| 44 /* The tag name used by artsc audio */ | |
| 45 #define NAS_DRIVER_NAME "nas" | |
| 46 | |
| 47 static struct SDL_PrivateAudioData *this2 = NULL; | |
| 48 | |
| 49 /* Audio driver functions */ | |
| 50 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 51 static void NAS_WaitAudio(_THIS); | |
| 52 static void NAS_PlayAudio(_THIS); | |
| 53 static Uint8 *NAS_GetAudioBuf(_THIS); | |
| 54 static void NAS_CloseAudio(_THIS); | |
| 55 | |
| 56 /* Audio driver bootstrap functions */ | |
| 57 | |
| 58 static int Audio_Available(void) | |
| 59 { | |
| 60 AuServer *aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 61 if (!aud) return 0; | |
| 62 | |
| 63 AuCloseServer(aud); | |
| 64 return 1; | |
| 65 } | |
| 66 | |
| 67 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 68 { | |
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69 SDL_free(device->hidden); |
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70 SDL_free(device); |
| 0 | 71 } |
| 72 | |
| 73 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 74 { | |
| 75 SDL_AudioDevice *this; | |
| 76 | |
| 77 /* Initialize all variables that we clean on shutdown */ | |
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78 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 79 if ( this ) { |
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80 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 81 this->hidden = (struct SDL_PrivateAudioData *) |
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82 SDL_malloc((sizeof *this->hidden)); |
| 0 | 83 } |
| 84 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 85 SDL_OutOfMemory(); | |
| 86 if ( this ) { | |
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87 SDL_free(this); |
| 0 | 88 } |
| 89 return(0); | |
| 90 } | |
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91 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 92 |
| 93 /* Set the function pointers */ | |
| 94 this->OpenAudio = NAS_OpenAudio; | |
| 95 this->WaitAudio = NAS_WaitAudio; | |
| 96 this->PlayAudio = NAS_PlayAudio; | |
| 97 this->GetAudioBuf = NAS_GetAudioBuf; | |
| 98 this->CloseAudio = NAS_CloseAudio; | |
| 99 | |
| 100 this->free = Audio_DeleteDevice; | |
| 101 | |
| 102 return this; | |
| 103 } | |
| 104 | |
| 105 AudioBootStrap NAS_bootstrap = { | |
| 106 NAS_DRIVER_NAME, "Network Audio System", | |
| 107 Audio_Available, Audio_CreateDevice | |
| 108 }; | |
| 109 | |
| 110 /* This function waits until it is possible to write a full sound buffer */ | |
| 111 static void NAS_WaitAudio(_THIS) | |
| 112 { | |
| 113 while ( this->hidden->buf_free < this->hidden->mixlen ) { | |
| 114 AuEvent ev; | |
| 115 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 116 AuDispatchEvent(this->hidden->aud, &ev); | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 static void NAS_PlayAudio(_THIS) | |
| 121 { | |
| 122 while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events, | |
| 123 in the hope that some of them is LowWater events telling us more | |
| 124 of the buffer is free now than what we think. */ | |
| 125 AuEvent ev; | |
| 126 AuNextEvent(this->hidden->aud, AuTrue, &ev); | |
| 127 AuDispatchEvent(this->hidden->aud, &ev); | |
| 128 } | |
| 129 this->hidden->buf_free -= this->hidden->mixlen; | |
| 130 | |
| 131 /* Write the audio data */ | |
| 132 AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL); | |
| 133 | |
| 134 this->hidden->written += this->hidden->mixlen; | |
| 135 | |
| 136 #ifdef DEBUG_AUDIO | |
| 137 fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen); | |
| 138 #endif | |
| 139 } | |
| 140 | |
| 141 static Uint8 *NAS_GetAudioBuf(_THIS) | |
| 142 { | |
| 143 return(this->hidden->mixbuf); | |
| 144 } | |
| 145 | |
| 146 static void NAS_CloseAudio(_THIS) | |
| 147 { | |
| 148 if ( this->hidden->mixbuf != NULL ) { | |
| 149 SDL_FreeAudioMem(this->hidden->mixbuf); | |
| 150 this->hidden->mixbuf = NULL; | |
| 151 } | |
| 152 if ( this->hidden->aud ) { | |
| 153 AuCloseServer(this->hidden->aud); | |
| 154 this->hidden->aud = 0; | |
| 155 } | |
| 156 } | |
| 157 | |
| 158 static unsigned char sdlformat_to_auformat(unsigned int fmt) | |
| 159 { | |
| 160 switch (fmt) | |
| 161 { | |
| 162 case AUDIO_U8: | |
| 163 return AuFormatLinearUnsigned8; | |
| 164 case AUDIO_S8: | |
| 165 return AuFormatLinearSigned8; | |
| 166 case AUDIO_U16LSB: | |
| 167 return AuFormatLinearUnsigned16LSB; | |
| 168 case AUDIO_U16MSB: | |
| 169 return AuFormatLinearUnsigned16MSB; | |
| 170 case AUDIO_S16LSB: | |
| 171 return AuFormatLinearSigned16LSB; | |
| 172 case AUDIO_S16MSB: | |
| 173 return AuFormatLinearSigned16MSB; | |
| 174 } | |
| 175 return AuNone; | |
| 176 } | |
| 177 | |
| 178 static AuBool | |
| 179 event_handler(AuServer* aud, AuEvent* ev, AuEventHandlerRec* hnd) | |
| 180 { | |
| 181 switch (ev->type) { | |
| 182 case AuEventTypeElementNotify: { | |
| 183 AuElementNotifyEvent* event = (AuElementNotifyEvent *)ev; | |
| 184 | |
| 185 switch (event->kind) { | |
| 186 case AuElementNotifyKindLowWater: | |
| 187 if (this2->buf_free >= 0) { | |
| 188 this2->really += event->num_bytes; | |
| 189 gettimeofday(&this2->last_tv, 0); | |
| 190 this2->buf_free += event->num_bytes; | |
| 191 } else { | |
| 192 this2->buf_free = event->num_bytes; | |
| 193 } | |
| 194 break; | |
| 195 case AuElementNotifyKindState: | |
| 196 switch (event->cur_state) { | |
| 197 case AuStatePause: | |
| 198 if (event->reason != AuReasonUser) { | |
| 199 if (this2->buf_free >= 0) { | |
| 200 this2->really += event->num_bytes; | |
| 201 gettimeofday(&this2->last_tv, 0); | |
| 202 this2->buf_free += event->num_bytes; | |
| 203 } else { | |
| 204 this2->buf_free = event->num_bytes; | |
| 205 } | |
| 206 } | |
| 207 break; | |
| 208 } | |
| 209 } | |
| 210 } | |
| 211 } | |
| 212 return AuTrue; | |
| 213 } | |
| 214 | |
| 215 static AuDeviceID | |
| 216 find_device(_THIS, int nch) | |
| 217 { | |
| 218 int i; | |
| 219 for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) { | |
| 220 if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) == | |
| 221 AuComponentKindPhysicalOutput) && | |
| 222 AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) { | |
| 223 return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i)); | |
| 224 } | |
| 225 } | |
| 226 return AuNone; | |
| 227 } | |
| 228 | |
| 229 static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 230 { | |
| 231 AuElement elms[3]; | |
| 232 int buffer_size; | |
| 233 Uint16 test_format, format; | |
| 234 | |
| 235 this->hidden->mixbuf = NULL; | |
| 236 | |
| 237 /* Try for a closest match on audio format */ | |
| 238 format = 0; | |
| 239 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 240 ! format && test_format; ) { | |
| 241 format = sdlformat_to_auformat(test_format); | |
| 242 | |
| 243 if (format == AuNone) { | |
| 244 test_format = SDL_NextAudioFormat(); | |
| 245 } | |
| 246 } | |
| 247 if ( format == 0 ) { | |
| 248 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 249 return(-1); | |
| 250 } | |
| 251 spec->format = test_format; | |
| 252 | |
| 253 this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL); | |
| 254 if (this->hidden->aud == 0) | |
| 255 { | |
| 256 SDL_SetError("Couldn't open connection to NAS server"); | |
| 257 return (-1); | |
| 258 } | |
| 259 | |
| 260 this->hidden->dev = find_device(this, spec->channels); | |
| 261 if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) { | |
| 262 AuCloseServer(this->hidden->aud); | |
| 263 this->hidden->aud = 0; | |
| 264 SDL_SetError("Couldn't find a fitting playback device on NAS server"); | |
| 265 return (-1); | |
| 266 } | |
| 267 | |
| 268 buffer_size = spec->freq; | |
| 269 if (buffer_size < 4096) | |
| 270 buffer_size = 4096; | |
| 271 | |
| 272 if (buffer_size > 32768) | |
| 273 buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ | |
| 274 | |
| 275 /* Calculate the final parameters for this audio specification */ | |
| 276 SDL_CalculateAudioSpec(spec); | |
| 277 | |
| 278 this2 = this->hidden; | |
| 279 | |
| 280 AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue, | |
| 281 buffer_size, buffer_size / 4, 0, NULL); | |
| 282 AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq, | |
| 283 AuUnlimitedSamples, 0, NULL); | |
| 284 AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); | |
| 285 AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, | |
| 286 event_handler, (AuPointer) NULL); | |
| 287 | |
| 288 AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); | |
| 289 | |
| 290 /* Allocate mixing buffer */ | |
| 291 this->hidden->mixlen = spec->size; | |
| 292 this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen); | |
| 293 if ( this->hidden->mixbuf == NULL ) { | |
| 294 return(-1); | |
| 295 } | |
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296 SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); |
| 0 | 297 |
| 298 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 299 this->hidden->parent = getpid(); | |
| 300 | |
| 301 /* We're ready to rock and roll. :-) */ | |
| 302 return(0); | |
| 303 } |