Mercurial > sdl-ios-xcode
annotate src/audio/nas/SDL_nasaudio.c @ 1295:c3e36ac8a94c
Date: Sun, 6 Mar 2005 17:06:20 +0100
From: Per Inge Mathisen
Subject: [SDL] Fullscreen refresh on win32
Windows has a terrible default for fullscreen 3D apps of 60mhz refresh
rate. This can be fixed by the user by going into his driver's
control panel and forcing the refresh rate higher. However, this not a
very user friendly way about it, and in any case SDL contains no code
that could figure out this that condition has afflicted the user.
So the question is, could SDL fix this for the user? It is possible
under Windows to request a higher refresh rate. The danger is of
course that if the user has an old monitor, and you request a too high
refresh rate, the monitor could be damaged. However, I believe there
might be a way around that: Check before switching what refresh rate
the user's desktop runs in, and if our fullscreen dimensions are equal
or less than those of the desktop, use the higher refresh rate of 60
and the desktop rate.
Since most users run their desktops in the same or higher resolution
something sane, this should fix this problem for most users.
Thoughts?
An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE)
option so that programs can bitch at their users at their own
convenience.
- Per
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 30 Jan 2006 06:56:10 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
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3 Copyright (C) 1997-2004 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 | |
|
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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 } |