| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 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 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* Allow access to a raw mixing buffer */ |
| 25 | |
| 26 | #include <fcntl.h> |
| 27 | #include <errno.h> |
| 28 | #ifdef __NETBSD__ |
| 29 | #include <sys/ioctl.h> |
| 30 | #include <sys/audioio.h> |
| 31 | #endif |
| 32 | #ifdef __SVR4 |
| 33 | #include <sys/audioio.h> |
| 34 | #else |
| 35 | #include <sys/time.h> |
| 36 | #include <sys/types.h> |
| 37 | #endif |
| 38 | #include <unistd.h> |
| 39 | |
| 40 | #include "SDL_timer.h" |
| 41 | #include "SDL_audio.h" |
| 42 | #include "../SDL_audiomem.h" |
| 43 | #include "../SDL_audio_c.h" |
| 44 | #include "../SDL_audiodev_c.h" |
| 45 | #include "SDL_sunaudio.h" |
| 46 | |
| 47 | /* Open the audio device for playback, and don't block if busy */ |
| 48 | #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) |
| 49 | |
| 50 | /* Audio driver functions */ |
| 51 | static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); |
| 52 | static void DSP_WaitAudio(_THIS); |
| 53 | static void DSP_PlayAudio(_THIS); |
| 54 | static Uint8 *DSP_GetAudioBuf(_THIS); |
| 55 | static void DSP_CloseAudio(_THIS); |
| 56 | |
| 57 | static Uint8 snd2au(int sample); |
| 58 | |
| 59 | /* Audio driver bootstrap functions */ |
| 60 | |
| 61 | static int Audio_Available(void) |
| 62 | { |
| 63 | int fd; |
| 64 | int available; |
| 65 | |
| 66 | available = 0; |
| 67 | fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 1); |
| 68 | if ( fd >= 0 ) { |
| 69 | available = 1; |
| 70 | close(fd); |
| 71 | } |
| 72 | return(available); |
| 73 | } |
| 74 | |
| 75 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
| 76 | { |
| 77 | SDL_free(device->hidden); |
| 78 | SDL_free(device); |
| 79 | } |
| 80 | |
| 81 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
| 82 | { |
| 83 | SDL_AudioDevice *this; |
| 84 | |
| 85 | /* Initialize all variables that we clean on shutdown */ |
| 86 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 87 | if ( this ) { |
| 88 | SDL_memset(this, 0, (sizeof *this)); |
| 89 | this->hidden = (struct SDL_PrivateAudioData *) |
| 90 | SDL_malloc((sizeof *this->hidden)); |
| 91 | } |
| 92 | if ( (this == NULL) || (this->hidden == NULL) ) { |
| 93 | SDL_OutOfMemory(); |
| 94 | if ( this ) { |
| 95 | SDL_free(this); |
| 96 | } |
| 97 | return(0); |
| 98 | } |
| 99 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 100 | audio_fd = -1; |
| 101 | |
| 102 | /* Set the function pointers */ |
| 103 | this->OpenAudio = DSP_OpenAudio; |
| 104 | this->WaitAudio = DSP_WaitAudio; |
| 105 | this->PlayAudio = DSP_PlayAudio; |
| 106 | this->GetAudioBuf = DSP_GetAudioBuf; |
| 107 | this->CloseAudio = DSP_CloseAudio; |
| 108 | |
| 109 | this->free = Audio_DeleteDevice; |
| 110 | |
| 111 | return this; |
| 112 | } |
| 113 | |
| 114 | AudioBootStrap SUNAUDIO_bootstrap = { |
| 115 | "audio", "UNIX /dev/audio interface", |
| 116 | Audio_Available, Audio_CreateDevice |
| 117 | }; |
| 118 | |
| 119 | #ifdef DEBUG_AUDIO |
| 120 | void CheckUnderflow(_THIS) |
| 121 | { |
| 122 | #ifdef AUDIO_GETINFO |
| 123 | audio_info_t info; |
| 124 | int left; |
| 125 | |
| 126 | ioctl(audio_fd, AUDIO_GETINFO, &info); |
| 127 | left = (written - info.play.samples); |
| 128 | if ( written && (left == 0) ) { |
| 129 | fprintf(stderr, "audio underflow!\n"); |
| 130 | } |
| 131 | #endif |
| 132 | } |
| 133 | #endif |
| 134 | |
| 135 | void DSP_WaitAudio(_THIS) |
| 136 | { |
| 137 | #ifdef AUDIO_GETINFO |
| 138 | #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */ |
| 139 | audio_info_t info; |
| 140 | Sint32 left; |
| 141 | |
| 142 | ioctl(audio_fd, AUDIO_GETINFO, &info); |
| 143 | left = (written - info.play.samples); |
| 144 | if ( left > fragsize ) { |
| 145 | Sint32 sleepy; |
| 146 | |
| 147 | sleepy = ((left - fragsize)/frequency); |
| 148 | sleepy -= SLEEP_FUDGE; |
| 149 | if ( sleepy > 0 ) { |
| 150 | SDL_Delay(sleepy); |
| 151 | } |
| 152 | } |
| 153 | #else |
| 154 | fd_set fdset; |
| 155 | |
| 156 | FD_ZERO(&fdset); |
| 157 | FD_SET(audio_fd, &fdset); |
| 158 | select(audio_fd+1, NULL, &fdset, NULL, NULL); |
| 159 | #endif |
| 160 | } |
| 161 | |
| 162 | void DSP_PlayAudio(_THIS) |
| 163 | { |
| 164 | /* Write the audio data */ |
| 165 | if ( ulaw_only ) { |
| 166 | /* Assuming that this->spec.freq >= 8000 Hz */ |
| 167 | int accum, incr, pos; |
| 168 | Uint8 *aubuf; |
| 169 | |
| 170 | accum = 0; |
| 171 | incr = this->spec.freq/8; |
| 172 | aubuf = ulaw_buf; |
| 173 | switch (audio_fmt & 0xFF) { |
| 174 | case 8: { |
| 175 | Uint8 *sndbuf; |
| 176 | |
| 177 | sndbuf = mixbuf; |
| 178 | for ( pos=0; pos < fragsize; ++pos ) { |
| 179 | *aubuf = snd2au((0x80-*sndbuf)*64); |
| 180 | accum += incr; |
| 181 | while ( accum > 0 ) { |
| 182 | accum -= 1000; |
| 183 | sndbuf += 1; |
| 184 | } |
| 185 | aubuf += 1; |
| 186 | } |
| 187 | } |
| 188 | break; |
| 189 | case 16: { |
| 190 | Sint16 *sndbuf; |
| 191 | |
| 192 | sndbuf = (Sint16 *)mixbuf; |
| 193 | for ( pos=0; pos < fragsize; ++pos ) { |
| 194 | *aubuf = snd2au(*sndbuf/4); |
| 195 | accum += incr; |
| 196 | while ( accum > 0 ) { |
| 197 | accum -= 1000; |
| 198 | sndbuf += 1; |
| 199 | } |
| 200 | aubuf += 1; |
| 201 | } |
| 202 | } |
| 203 | break; |
| 204 | } |
| 205 | #ifdef DEBUG_AUDIO |
| 206 | CheckUnderflow(this); |
| 207 | #endif |
| 208 | if ( write(audio_fd, ulaw_buf, fragsize) < 0 ) { |
| 209 | /* Assume fatal error, for now */ |
| 210 | this->enabled = 0; |
| 211 | } |
| 212 | written += fragsize; |
| 213 | } else { |
| 214 | #ifdef DEBUG_AUDIO |
| 215 | CheckUnderflow(this); |
| 216 | #endif |
| 217 | if ( write(audio_fd, mixbuf, this->spec.size) < 0 ) { |
| 218 | /* Assume fatal error, for now */ |
| 219 | this->enabled = 0; |
| 220 | } |
| 221 | written += fragsize; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | Uint8 *DSP_GetAudioBuf(_THIS) |
| 226 | { |
| 227 | return(mixbuf); |
| 228 | } |
| 229 | |
| 230 | void DSP_CloseAudio(_THIS) |
| 231 | { |
| 232 | if ( mixbuf != NULL ) { |
| 233 | SDL_FreeAudioMem(mixbuf); |
| 234 | mixbuf = NULL; |
| 235 | } |
| 236 | if ( ulaw_buf != NULL ) { |
| 237 | SDL_free(ulaw_buf); |
| 238 | ulaw_buf = NULL; |
| 239 | } |
| 240 | close(audio_fd); |
| 241 | } |
| 242 | |
| 243 | int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 244 | { |
| 245 | char audiodev[1024]; |
| 246 | #ifdef AUDIO_SETINFO |
| 247 | int enc; |
| 248 | #endif |
| 249 | int desired_freq = spec->freq; |
| 250 | |
| 251 | /* Initialize our freeable variables, in case we fail*/ |
| 252 | audio_fd = -1; |
| 253 | mixbuf = NULL; |
| 254 | ulaw_buf = NULL; |
| 255 | |
| 256 | /* Determine the audio parameters from the AudioSpec */ |
| 257 | switch ( spec->format & 0xFF ) { |
| 258 | |
| 259 | case 8: { /* Unsigned 8 bit audio data */ |
| 260 | spec->format = AUDIO_U8; |
| 261 | #ifdef AUDIO_SETINFO |
| 262 | enc = AUDIO_ENCODING_LINEAR8; |
| 263 | #endif |
| 264 | } |
| 265 | break; |
| 266 | |
| 267 | case 16: { /* Signed 16 bit audio data */ |
| 268 | spec->format = AUDIO_S16SYS; |
| 269 | #ifdef AUDIO_SETINFO |
| 270 | enc = AUDIO_ENCODING_LINEAR; |
| 271 | #endif |
| 272 | } |
| 273 | break; |
| 274 | |
| 275 | default: { |
| 276 | SDL_SetError("Unsupported audio format"); |
| 277 | return(-1); |
| 278 | } |
| 279 | } |
| 280 | audio_fmt = spec->format; |
| 281 | |
| 282 | /* Open the audio device */ |
| 283 | audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 1); |
| 284 | if ( audio_fd < 0 ) { |
| 285 | SDL_SetError("Couldn't open %s: %s", audiodev, |
| 286 | strerror(errno)); |
| 287 | return(-1); |
| 288 | } |
| 289 | |
| 290 | ulaw_only = 0; /* modern Suns do support linear audio */ |
| 291 | #ifdef AUDIO_SETINFO |
| 292 | for(;;) { |
| 293 | audio_info_t info; |
| 294 | AUDIO_INITINFO(&info); /* init all fields to "no change" */ |
| 295 | |
| 296 | /* Try to set the requested settings */ |
| 297 | info.play.sample_rate = spec->freq; |
| 298 | info.play.channels = spec->channels; |
| 299 | info.play.precision = (enc == AUDIO_ENCODING_ULAW) |
| 300 | ? 8 : spec->format & 0xff; |
| 301 | info.play.encoding = enc; |
| 302 | if( ioctl(audio_fd, AUDIO_SETINFO, &info) == 0 ) { |
| 303 | |
| 304 | /* Check to be sure we got what we wanted */ |
| 305 | if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
| 306 | SDL_SetError("Error getting audio parameters: %s", |
| 307 | strerror(errno)); |
| 308 | return -1; |
| 309 | } |
| 310 | if(info.play.encoding == enc |
| 311 | && info.play.precision == (spec->format & 0xff) |
| 312 | && info.play.channels == spec->channels) { |
| 313 | /* Yow! All seems to be well! */ |
| 314 | spec->freq = info.play.sample_rate; |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | switch(enc) { |
| 320 | case AUDIO_ENCODING_LINEAR8: |
| 321 | /* unsigned 8bit apparently not supported here */ |
| 322 | enc = AUDIO_ENCODING_LINEAR; |
| 323 | spec->format = AUDIO_S16SYS; |
| 324 | break; /* try again */ |
| 325 | |
| 326 | case AUDIO_ENCODING_LINEAR: |
| 327 |