Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | 4263beff9e38 |
| children | 3692456e7b0f |
| 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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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 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
| 25 #include <sys/types.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <stdio.h> | |
| 28 #include <string.h> | |
| 29 #include <errno.h> | |
| 30 #include <signal.h> | |
| 31 #include <unistd.h> | |
| 32 | |
| 33 #include "SDL_audio.h" | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_audiomem.h" | |
| 36 #include "SDL_audio_c.h" | |
| 37 #include "SDL_timer.h" | |
| 38 #include "SDL_audiodev_c.h" | |
| 39 #include "SDL_artsaudio.h" | |
| 40 | |
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41 #ifdef ARTSC_DYNAMIC |
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42 #include "SDL_name.h" |
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43 #include "SDL_loadso.h" |
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44 #else |
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45 #define SDL_NAME(X) X |
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46 #endif |
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47 |
| 0 | 48 /* The tag name used by artsc audio */ |
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49 #define ARTSC_DRIVER_NAME "arts" |
| 0 | 50 |
| 51 /* Audio driver functions */ | |
| 52 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 53 static void ARTSC_WaitAudio(_THIS); | |
| 54 static void ARTSC_PlayAudio(_THIS); | |
| 55 static Uint8 *ARTSC_GetAudioBuf(_THIS); | |
| 56 static void ARTSC_CloseAudio(_THIS); | |
| 57 | |
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58 #ifdef ARTSC_DYNAMIC |
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59 |
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60 static const char *arts_library = ARTSC_DYNAMIC; |
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61 static void *arts_handle = NULL; |
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62 static int arts_loaded = 0; |
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63 |
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64 static int (*SDL_NAME(arts_init))(void); |
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65 static void (*SDL_NAME(arts_free))(void); |
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66 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name); |
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67 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value); |
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68 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param); |
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69 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count); |
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70 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s); |
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71 |
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72 static struct { |
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73 const char *name; |
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74 void **func; |
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75 } arts_functions[] = { |
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76 { "arts_init", (void **)&SDL_NAME(arts_init) }, |
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77 { "arts_free", (void **)&SDL_NAME(arts_free) }, |
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78 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) }, |
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79 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) }, |
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80 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) }, |
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81 { "arts_write", (void **)&SDL_NAME(arts_write) }, |
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82 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) }, |
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83 }; |
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84 |
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85 static void UnloadARTSLibrary() |
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86 { |
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87 if ( arts_loaded ) { |
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88 SDL_UnloadObject(arts_handle); |
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89 arts_handle = NULL; |
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90 arts_loaded = 0; |
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91 } |
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92 } |
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93 |
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94 static int LoadARTSLibrary(void) |
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95 { |
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96 int i, retval = -1; |
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97 |
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98 arts_handle = SDL_LoadObject(arts_library); |
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99 if ( arts_handle ) { |
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100 arts_loaded = 1; |
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101 retval = 0; |
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102 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) { |
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103 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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104 if ( !*arts_functions[i].func ) { |
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105 retval = -1; |
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106 UnloadARTSLibrary(); |
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107 break; |
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108 } |
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109 } |
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110 } |
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111 return retval; |
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112 } |
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113 |
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114 #else |
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115 |
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116 static void UnloadARTSLibrary() |
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117 { |
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118 return; |
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119 } |
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120 |
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121 static int LoadARTSLibrary(void) |
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122 { |
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123 return 0; |
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124 } |
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125 |
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126 #endif /* ARTSC_DYNAMIC */ |
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127 |
| 0 | 128 /* Audio driver bootstrap functions */ |
| 129 | |
| 130 static int Audio_Available(void) | |
| 131 { | |
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132 int available = 0; |
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133 |
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134 if ( LoadARTSLibrary() < 0 ) { |
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135 return available; |
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136 } |
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137 if ( SDL_NAME(arts_init)() == 0 ) { |
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138 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */ |
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139 #ifdef ARTS_CRASH_HACK |
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140 arts_stream_t stream2; |
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141 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL"); |
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142 SDL_NAME(arts_write)(stream2, "", 0); |
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143 SDL_NAME(arts_close_stream)(stream2); |
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144 #endif |
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145 available = 1; |
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146 SDL_NAME(arts_free)(); |
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147 } |
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148 UnloadARTSLibrary(); |
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149 |
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150 return available; |
| 0 | 151 } |
| 152 | |
| 153 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 154 { | |
| 155 free(device->hidden); | |
| 156 free(device); | |
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157 UnloadARTSLibrary(); |
| 0 | 158 } |
| 159 | |
| 160 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 161 { | |
| 162 SDL_AudioDevice *this; | |
| 163 | |
| 164 /* Initialize all variables that we clean on shutdown */ | |
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165 LoadARTSLibrary(); |
| 0 | 166 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
| 167 if ( this ) { | |
| 168 memset(this, 0, (sizeof *this)); | |
| 169 this->hidden = (struct SDL_PrivateAudioData *) | |
| 170 malloc((sizeof *this->hidden)); | |
| 171 } | |
| 172 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 173 SDL_OutOfMemory(); | |
| 174 if ( this ) { | |
| 175 free(this); | |
| 176 } | |
| 177 return(0); | |
| 178 } | |
| 179 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 180 stream = 0; | |
| 181 | |
| 182 /* Set the function pointers */ | |
| 183 this->OpenAudio = ARTSC_OpenAudio; | |
| 184 this->WaitAudio = ARTSC_WaitAudio; | |
| 185 this->PlayAudio = ARTSC_PlayAudio; | |
| 186 this->GetAudioBuf = ARTSC_GetAudioBuf; | |
| 187 this->CloseAudio = ARTSC_CloseAudio; | |
| 188 | |
| 189 this->free = Audio_DeleteDevice; | |
| 190 | |
| 191 return this; | |
| 192 } | |
| 193 | |
| 194 AudioBootStrap ARTSC_bootstrap = { | |
| 195 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer", | |
| 196 Audio_Available, Audio_CreateDevice | |
| 197 }; | |
| 198 | |
| 199 /* This function waits until it is possible to write a full sound buffer */ | |
| 200 static void ARTSC_WaitAudio(_THIS) | |
| 201 { | |
| 202 Sint32 ticks; | |
| 203 | |
| 204 /* Check to see if the thread-parent process is still alive */ | |
| 205 { static int cnt = 0; | |
| 206 /* Note that this only works with thread implementations | |
| 207 that use a different process id for each thread. | |
| 208 */ | |
| 209 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 210 if ( kill(parent, 0) < 0 ) { | |
| 211 this->enabled = 0; | |
| 212 } | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 /* Use timer for general audio synchronization */ | |
| 217 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 218 if ( ticks > 0 ) { | |
| 219 SDL_Delay(ticks); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 static void ARTSC_PlayAudio(_THIS) | |
| 224 { | |
| 225 int written; | |
| 226 | |
| 227 /* Write the audio data */ | |
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228 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); |
| 0 | 229 |
| 230 /* If timer synchronization is enabled, set the next write frame */ | |
| 231 if ( frame_ticks ) { | |
| 232 next_frame += frame_ticks; | |
| 233 } | |
| 234 | |
| 235 /* If we couldn't write, assume fatal error for now */ | |
| 236 if ( written < 0 ) { | |
| 237 this->enabled = 0; | |
| 238 } | |
| 239 #ifdef DEBUG_AUDIO | |
| 240 fprintf(stderr, "Wrote %d bytes of audio data\n", written); | |
| 241 #endif | |
| 242 } | |
| 243 | |
| 244 static Uint8 *ARTSC_GetAudioBuf(_THIS) | |
| 245 { | |
| 246 return(mixbuf); | |
| 247 } | |
| 248 | |
| 249 static void ARTSC_CloseAudio(_THIS) | |
| 250 { | |
| 251 if ( mixbuf != NULL ) { | |
| 252 SDL_FreeAudioMem(mixbuf); | |
| 253 mixbuf = NULL; | |
| 254 } | |
| 255 if ( stream ) { | |
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256 SDL_NAME(arts_close_stream)(stream); |
| 0 | 257 stream = 0; |
| 258 } | |
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259 SDL_NAME(arts_free)(); |
| 0 | 260 } |
| 261 | |
| 262 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 263 { | |
| 264 int bits, frag_spec; | |
| 265 Uint16 test_format, format; | |
| 266 | |
| 267 /* Reset the timer synchronization flag */ | |
| 268 frame_ticks = 0.0; | |
| 269 | |
| 270 mixbuf = NULL; | |
| 271 | |
| 272 /* Try for a closest match on audio format */ | |
| 273 format = 0; | |
| 274 bits = 0; | |
| 275 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 276 ! format && test_format; ) { | |
| 277 #ifdef DEBUG_AUDIO | |
| 278 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
| 279 #endif | |
| 280 switch ( test_format ) { | |
| 281 case AUDIO_U8: | |
| 282 bits = 8; | |
| 283 format = 1; | |
| 284 break; | |
| 285 case AUDIO_S16LSB: | |
| 286 bits = 16; | |
| 287 format = 1; | |
| 288 break; | |
| 289 default: | |
| 290 format = 0; | |
| 291 break; | |
| 292 } | |
| 293 if ( ! format ) { | |
| 294 test_format = SDL_NextAudioFormat(); | |
| 295 } | |
| 296 } | |
| 297 if ( format == 0 ) { | |
| 298 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 299 return(-1); | |
| 300 } | |
| 301 spec->format = test_format; | |
| 302 | |
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303 if ( SDL_NAME(arts_init)() != 0 ) { |
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304 SDL_SetError("Unable to initialize ARTS"); |
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305 return(-1); |
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306 } |
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307 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); |
| 0 | 308 |
| 309 /* Calculate the final parameters for this audio specification */ | |
| 310 SDL_CalculateAudioSpec(spec); | |
| 311 | |
| 312 /* Determine the power of two of the fragment size */ | |
| 313 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 314 if ( (0x01<<frag_spec) != spec->size ) { | |
| 315 SDL_SetError("Fragment size must be a power of two"); | |
| 316 return(-1); | |
| 317 } | |
| 318 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 319 | |
| 320 #ifdef ARTS_P_PACKET_SETTINGS | |
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321 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); |
| 0 | 322 #else |
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323 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); |
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324 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); |
| 0 | 325 #endif |
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326 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); |
| 0 | 327 |
| 328 /* Allocate mixing buffer */ | |
| 329 mixlen = spec->size; | |
| 330 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 331 if ( mixbuf == NULL ) { | |
| 332 return(-1); | |
| 333 } | |
| 334 memset(mixbuf, spec->silence, spec->size); | |
| 335 | |
| 336 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 337 parent = getpid(); | |
| 338 | |
| 339 /* We're ready to rock and roll. :-) */ | |
| 340 return(0); | |
| 341 } |