Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 28 Jun 2003 21:52:26 +0000 |
| parents | 583a07ab5444 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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 | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 | |
| 30 #include <sys/types.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <stdio.h> | |
| 33 #include <string.h> | |
| 34 #include <errno.h> | |
| 35 #include <signal.h> | |
| 36 #include <unistd.h> | |
| 37 | |
| 38 #include "SDL_audio.h" | |
| 39 #include "SDL_error.h" | |
| 40 #include "SDL_audiomem.h" | |
| 41 #include "SDL_audio_c.h" | |
| 42 #include "SDL_timer.h" | |
| 43 #include "SDL_audiodev_c.h" | |
| 44 #include "SDL_artsaudio.h" | |
| 45 | |
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46 #ifdef ARTSC_DYNAMIC |
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47 #include "SDL_name.h" |
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48 #include "SDL_loadso.h" |
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49 #else |
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50 #define SDL_NAME(X) X |
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51 #endif |
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52 |
| 0 | 53 /* The tag name used by artsc audio */ |
| 54 #define ARTSC_DRIVER_NAME "artsc" | |
| 55 | |
| 56 /* Audio driver functions */ | |
| 57 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 58 static void ARTSC_WaitAudio(_THIS); | |
| 59 static void ARTSC_PlayAudio(_THIS); | |
| 60 static Uint8 *ARTSC_GetAudioBuf(_THIS); | |
| 61 static void ARTSC_CloseAudio(_THIS); | |
| 62 | |
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63 #ifdef ARTSC_DYNAMIC |
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64 |
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65 static const char *arts_library = ARTSC_DYNAMIC; |
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66 static void *arts_handle = NULL; |
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67 static int arts_loaded = 0; |
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68 |
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69 static int (*SDL_NAME(arts_init))(void); |
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70 static void (*SDL_NAME(arts_free))(void); |
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71 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name); |
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72 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value); |
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73 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param); |
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74 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count); |
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75 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s); |
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76 |
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77 static struct { |
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78 const char *name; |
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79 void **func; |
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80 } arts_functions[] = { |
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81 { "arts_init", (void **)&SDL_NAME(arts_init) }, |
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82 { "arts_free", (void **)&SDL_NAME(arts_free) }, |
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83 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) }, |
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84 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) }, |
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85 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) }, |
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86 { "arts_write", (void **)&SDL_NAME(arts_write) }, |
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87 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) }, |
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88 }; |
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89 |
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90 static void UnloadARTSLibrary() |
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91 { |
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92 if ( arts_loaded ) { |
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93 SDL_UnloadObject(arts_handle); |
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94 arts_handle = NULL; |
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95 arts_loaded = 0; |
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96 } |
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97 } |
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98 |
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99 static int LoadARTSLibrary(void) |
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100 { |
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101 int i, retval = -1; |
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102 |
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103 arts_handle = SDL_LoadObject(arts_library); |
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104 if ( arts_handle ) { |
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105 arts_loaded = 1; |
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106 retval = 0; |
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107 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) { |
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108 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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109 if ( ! arts_functions[i].func ) { |
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110 retval = -1; |
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111 UnloadARTSLibrary(); |
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112 break; |
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113 } |
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114 } |
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115 } |
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116 return retval; |
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117 } |
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118 |
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119 #else |
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120 |
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121 static void UnloadARTSLibrary() |
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122 { |
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123 return; |
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124 } |
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125 |
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126 static int LoadARTSLibrary(void) |
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127 { |
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128 return 0; |
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129 } |
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130 |
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131 #endif /* ARTSC_DYNAMIC */ |
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132 |
| 0 | 133 /* Audio driver bootstrap functions */ |
| 134 | |
| 135 static int Audio_Available(void) | |
| 136 { | |
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137 int available = 0; |
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138 |
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139 if ( LoadARTSLibrary() < 0 ) { |
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140 return available; |
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141 } |
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142 if ( SDL_NAME(arts_init)() == 0 ) { |
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143 available = 1; |
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144 SDL_NAME(arts_free)(); |
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145 } |
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146 UnloadARTSLibrary(); |
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147 |
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148 return available; |
| 0 | 149 } |
| 150 | |
| 151 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 152 { | |
| 153 free(device->hidden); | |
| 154 free(device); | |
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155 UnloadARTSLibrary(); |
| 0 | 156 } |
| 157 | |
| 158 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 159 { | |
| 160 SDL_AudioDevice *this; | |
| 161 | |
| 162 /* Initialize all variables that we clean on shutdown */ | |
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163 LoadARTSLibrary(); |
| 0 | 164 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
| 165 if ( this ) { | |
| 166 memset(this, 0, (sizeof *this)); | |
| 167 this->hidden = (struct SDL_PrivateAudioData *) | |
| 168 malloc((sizeof *this->hidden)); | |
| 169 } | |
| 170 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 171 SDL_OutOfMemory(); | |
| 172 if ( this ) { | |
| 173 free(this); | |
| 174 } | |
| 175 return(0); | |
| 176 } | |
| 177 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 178 stream = 0; | |
| 179 | |
| 180 /* Set the function pointers */ | |
| 181 this->OpenAudio = ARTSC_OpenAudio; | |
| 182 this->WaitAudio = ARTSC_WaitAudio; | |
| 183 this->PlayAudio = ARTSC_PlayAudio; | |
| 184 this->GetAudioBuf = ARTSC_GetAudioBuf; | |
| 185 this->CloseAudio = ARTSC_CloseAudio; | |
| 186 | |
| 187 this->free = Audio_DeleteDevice; | |
| 188 | |
| 189 return this; | |
| 190 } | |
| 191 | |
| 192 AudioBootStrap ARTSC_bootstrap = { | |
| 193 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer", | |
| 194 Audio_Available, Audio_CreateDevice | |
| 195 }; | |
| 196 | |
| 197 /* This function waits until it is possible to write a full sound buffer */ | |
| 198 static void ARTSC_WaitAudio(_THIS) | |
| 199 { | |
| 200 Sint32 ticks; | |
| 201 | |
| 202 /* Check to see if the thread-parent process is still alive */ | |
| 203 { static int cnt = 0; | |
| 204 /* Note that this only works with thread implementations | |
| 205 that use a different process id for each thread. | |
| 206 */ | |
| 207 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 208 if ( kill(parent, 0) < 0 ) { | |
| 209 this->enabled = 0; | |
| 210 } | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 /* Use timer for general audio synchronization */ | |
| 215 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 216 if ( ticks > 0 ) { | |
| 217 SDL_Delay(ticks); | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 static void ARTSC_PlayAudio(_THIS) | |
| 222 { | |
| 223 int written; | |
| 224 | |
| 225 /* Write the audio data */ | |
|
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226 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); |
| 0 | 227 |
| 228 /* If timer synchronization is enabled, set the next write frame */ | |
| 229 if ( frame_ticks ) { | |
| 230 next_frame += frame_ticks; | |
| 231 } | |
| 232 | |
| 233 /* If we couldn't write, assume fatal error for now */ | |
| 234 if ( written < 0 ) { | |
| 235 this->enabled = 0; | |
| 236 } | |
| 237 #ifdef DEBUG_AUDIO | |
| 238 fprintf(stderr, "Wrote %d bytes of audio data\n", written); | |
| 239 #endif | |
| 240 } | |
| 241 | |
| 242 static Uint8 *ARTSC_GetAudioBuf(_THIS) | |
| 243 { | |
| 244 return(mixbuf); | |
| 245 } | |
| 246 | |
| 247 static void ARTSC_CloseAudio(_THIS) | |
| 248 { | |
| 249 if ( mixbuf != NULL ) { | |
| 250 SDL_FreeAudioMem(mixbuf); | |
| 251 mixbuf = NULL; | |
| 252 } | |
| 253 if ( stream ) { | |
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254 SDL_NAME(arts_close_stream)(stream); |
| 0 | 255 stream = 0; |
| 256 } | |
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257 SDL_NAME(arts_free)(); |
| 0 | 258 } |
| 259 | |
| 260 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 261 { | |
| 262 int bits, frag_spec; | |
| 263 Uint16 test_format, format; | |
| 264 | |
| 265 /* Reset the timer synchronization flag */ | |
| 266 frame_ticks = 0.0; | |
| 267 | |
| 268 mixbuf = NULL; | |
| 269 | |
| 270 /* Try for a closest match on audio format */ | |
| 271 format = 0; | |
| 272 bits = 0; | |
| 273 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 274 ! format && test_format; ) { | |
| 275 #ifdef DEBUG_AUDIO | |
| 276 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
| 277 #endif | |
| 278 switch ( test_format ) { | |
| 279 case AUDIO_U8: | |
| 280 bits = 8; | |
| 281 format = 1; | |
| 282 break; | |
| 283 case AUDIO_S16LSB: | |
| 284 bits = 16; | |
| 285 format = 1; | |
| 286 break; | |
| 287 default: | |
| 288 format = 0; | |
| 289 break; | |
| 290 } | |
| 291 if ( ! format ) { | |
| 292 test_format = SDL_NextAudioFormat(); | |
| 293 } | |
| 294 } | |
| 295 if ( format == 0 ) { | |
| 296 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 297 return(-1); | |
| 298 } | |
| 299 spec->format = test_format; | |
| 300 | |
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301 if ( SDL_NAME(arts_init)() != 0 ) { |
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302 SDL_SetError("Unable to initialize ARTS"); |
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303 return(-1); |
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304 } |
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305 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); |
| 0 | 306 |
| 307 /* Calculate the final parameters for this audio specification */ | |
| 308 SDL_CalculateAudioSpec(spec); | |
| 309 | |
| 310 /* Determine the power of two of the fragment size */ | |
| 311 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 312 if ( (0x01<<frag_spec) != spec->size ) { | |
| 313 SDL_SetError("Fragment size must be a power of two"); | |
| 314 return(-1); | |
| 315 } | |
| 316 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 317 | |
| 318 #ifdef ARTS_P_PACKET_SETTINGS | |
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319 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); |
| 0 | 320 #else |
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321 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); |
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322 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); |
| 0 | 323 #endif |
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324 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); |
| 0 | 325 |
| 326 /* Allocate mixing buffer */ | |
| 327 mixlen = spec->size; | |
| 328 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 329 if ( mixbuf == NULL ) { | |
| 330 return(-1); | |
| 331 } | |
| 332 memset(mixbuf, spec->silence, spec->size); | |
| 333 | |
| 334 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 335 parent = getpid(); | |
| 336 | |
| 337 /* We're ready to rock and roll. :-) */ | |
| 338 return(0); | |
| 339 } |