Alc/oss.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <sys/ioctl.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <memory.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <math.h>
  33 #include "alMain.h"
  34 #include "AL/al.h"
  35 #include "AL/alc.h"
  36
  37 #include <sys/soundcard.h>
  38
  39 /*
  40  * The OSS documentation talks about SOUND_MIXER_READ, but the header
  41  * only contains MIXER_READ. Play safe. Same for WRITE.
  42  */
  43 #ifndef SOUND_MIXER_READ
  44 #define SOUND_MIXER_READ MIXER_READ
  45 #endif
  46 #ifndef SOUND_MIXER_WRITE
  47 #define SOUND_MIXER_WRITE MIXER_WRITE
  48 #endif
  49
  50 static const ALCchar oss_device[] = "OSS Default";
  51
  52 typedef struct {
  53     int fd;
  54     volatile int killNow;
  55     ALvoid *thread;
  56
  57     ALubyte *mix_data;
  58     int data_size;
  59
  60     RingBuffer *ring;
  61     int doCapture;
  62 } oss_data;
  63
  64
  65 static int log2i(ALCuint x)
  66 {
  67     int y = 0;
  68     while (x > 1)
  69     {
  70         x >>= 1;
  71         y++;
  72     }
  73     return y;
  74 }
  75
  76
  77 static ALuint OSSProc(ALvoid *ptr)
  78 {
  79     ALCdevice *pDevice = (ALCdevice*)ptr;
  80     oss_data *data = (oss_data*)pDevice->ExtraData;
  81     ALint frameSize;
  82     ssize_t wrote;
  83
  84     SetRTPriority();
  85
  86     frameSize = aluFrameSizeFromFormat(pDevice->Format);
  87
  88     while(!data->killNow && pDevice->Connected)
  89     {
  90         ALint len = data->data_size;
  91         ALubyte *WritePtr = data->mix_data;
  92
  93         aluMixData(pDevice, WritePtr, len/frameSize);
  94         while(len > 0 && !data->killNow)
  95         {
  96             wrote = write(data->fd, WritePtr, len);
  97             if(wrote < 0)
  98             {
  99                 if(errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
 100                 {
 101                     AL_PRINT("write failed: %s\n", strerror(errno));
 102                     aluHandleDisconnect(pDevice);
 103                     break;
 104                 }
 105
 106                 Sleep(1);
 107                 continue;
 108             }
 109
 110             len -= wrote;
 111             WritePtr += wrote;
 112         }
 113     }
 114
 115     return 0;
 116 }
 117
 118 static ALuint OSSCaptureProc(ALvoid *ptr)
 119 {
 120     ALCdevice *pDevice = (ALCdevice*)ptr;
 121     oss_data *data = (oss_data*)pDevice->ExtraData;
 122     int frameSize;
 123     int amt;
 124
 125     SetRTPriority();
 126
 127     frameSize = aluFrameSizeFromFormat(pDevice->Format);
 128
 129     while(!data->killNow)
 130     {
 131         amt = read(data->fd, data->mix_data, data->data_size);
 132         if(amt < 0)
 133         {
 134             AL_PRINT("read failed: %s\n", strerror(errno));
 135             aluHandleDisconnect(pDevice);
 136             break;
 137         }
 138         if(amt == 0)
 139         {
 140             Sleep(1);
 141             continue;
 142         }
 143         if(data->doCapture)
 144             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 145     }
 146
 147     return 0;
 148 }
 149
 150 static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 151 {
 152     char driver[64];
 153     oss_data *data;
 154
 155     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 156     driver[sizeof(driver)-1] = 0;
 157     if(!deviceName)
 158         deviceName = oss_device;
 159     else if(strcmp(deviceName, oss_device) != 0)
 160         return ALC_FALSE;
 161
 162     data = (oss_data*)calloc(1, sizeof(oss_data));
 163     data->killNow = 0;
 164
 165     data->fd = open(driver, O_WRONLY);
 166     if(data->fd == -1)
 167     {
 168         free(data);
 169         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 170         return ALC_FALSE;
 171     }
 172
 173     device->szDeviceName = strdup(deviceName);
 174     device->ExtraData = data;
 175     return ALC_TRUE;
 176 }
 177
 178 static void oss_close_playback(ALCdevice *device)
 179 {
 180     oss_data *data = (oss_data*)device->ExtraData;
 181
 182     close(data->fd);
 183     free(data);
 184     device->ExtraData = NULL;
 185 }
 186
 187 static ALCboolean oss_reset_playback(ALCdevice *device)
 188 {
 189     oss_data *data = (oss_data*)device->ExtraData;
 190     int numFragmentsLogSize;
 191     int log2FragmentSize;
 192     unsigned int periods;
 193     audio_buf_info info;
 194     ALuint frameSize;
 195     int numChannels;
 196     int ossFormat;
 197     int ossSpeed;
 198     char *err;
 199     int i;
 200
 201     switch(aluBytesFromFormat(device->Format))
 202     {
 203         case 1:
 204             ossFormat = AFMT_U8;
 205             break;
 206         case 4:
 207             switch(aluChannelsFromFormat(device->Format))
 208             {
 209                 case 1: device->Format = AL_FORMAT_MONO16; break;
 210                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 211                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 212                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 213                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 214                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 215             }
 216             /* fall-through */
 217         case 2:
 218             ossFormat = AFMT_S16_NE;
 219             break;
 220         default:
 221             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 222             return ALC_FALSE;
 223     }
 224
 225     periods = device->NumUpdates;
 226     numChannels = aluChannelsFromFormat(device->Format);
 227     frameSize = numChannels * aluBytesFromFormat(device->Format);
 228
 229     ossSpeed = device->Frequency;
 230     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 231
 232     /* according to the OSS spec, 16 bytes are the minimum */
 233     if (log2FragmentSize < 4)
 234         log2FragmentSize = 4;
 235     /* Subtract one period since the temp mixing buffer counts as one. Still
 236      * need at least two on the card, though. */
 237     if(periods > 2) periods--;
 238     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 239
 240 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 241     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 242      * that's reported back via GETOSPACE */
 243     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 244     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 245           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 246           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 247           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 248     {
 249         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 250         return ALC_FALSE;
 251     }
 252 #undef ok
 253
 254     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 255     {
 256         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 257         return ALC_FALSE;
 258     }
 259
 260     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 261          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 262     {
 263         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 264         return ALC_FALSE;
 265     }
 266
 267     device->Frequency = ossSpeed;
 268     device->UpdateSize = info.fragsize / frameSize;
 269     device->NumUpdates = info.fragments + 1;
 270     device->TimeRes = (ALuint64)device->UpdateSize * 1000000000 /
 271                       device->Frequency;
 272
 273     data->data_size = device->UpdateSize * frameSize;
 274     data->mix_data = calloc(1, data->data_size);
 275
 276     SetDefaultChannelOrder(device);
 277
 278     data->thread = StartThread(OSSProc, device);
 279     if(data->thread == NULL)
 280     {
 281         free(data->mix_data);
 282         data->mix_data = NULL;
 283         return ALC_FALSE;
 284     }
 285
 286     return ALC_TRUE;
 287 }
 288
 289 static void oss_stop_playback(ALCdevice *device)
 290 {
 291     oss_data *data = (oss_data*)device->ExtraData;
 292
 293     if(!data->thread)
 294         return;
 295
 296     data->killNow = 1;
 297     StopThread(data->thread);
 298     data->thread = NULL;
 299
 300     data->killNow = 0;
 301     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 302         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 303
 304     free(data->mix_data);
 305     data->mix_data = NULL;
 306 }
 307
 308
 309 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 310 {
 311     int numFragmentsLogSize;
 312     int log2FragmentSize;
 313     unsigned int periods;
 314     audio_buf_info info;
 315     ALuint frameSize;
 316     int numChannels;
 317     char driver[64];
 318     oss_data *data;
 319     int ossFormat;
 320     int ossSpeed;
 321     char *err;
 322     int i;
 323
 324     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 325     driver[sizeof(driver)-1] = 0;
 326     if(!deviceName)
 327         deviceName = oss_device;
 328     else if(strcmp(deviceName, oss_device) != 0)
 329         return ALC_FALSE;
 330
 331     data = (oss_data*)calloc(1, sizeof(oss_data));
 332     data->killNow = 0;
 333
 334     data->fd = open(driver, O_RDONLY);
 335     if(data->fd == -1)
 336     {
 337         free(data);
 338         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 339         return ALC_FALSE;
 340     }
 341
 342     switch(aluBytesFromFormat(device->Format))
 343     {
 344         case 1:
 345             ossFormat = AFMT_U8;
 346             break;
 347         case 2:
 348             ossFormat = AFMT_S16_NE;
 349             break;
 350         default:
 351             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 352             close(data->fd);
 353             free(data);
 354             return ALC_FALSE;
 355     }
 356
 357     periods = 4;
 358     numChannels = aluChannelsFromFormat(device->Format);
 359     frameSize = numChannels * aluBytesFromFormat(device->Format);
 360     ossSpeed = device->Frequency;
 361     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 362                              frameSize / periods);
 363
 364     /* according to the OSS spec, 16 bytes are the minimum */
 365     if (log2FragmentSize < 4)
 366         log2FragmentSize = 4;
 367     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 368
 369 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 370     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 371           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 372           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 373           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 374           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 375     {
 376         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 377         close(data->fd);
 378         free(data);
 379         return ALC_FALSE;
 380     }
 381 #undef ok
 382
 383     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 384     {
 385         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 386         close(data->fd);
 387         free(data);
 388         return ALC_FALSE;
 389     }
 390
 391     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 392          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 393     {
 394         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 395         close(data->fd);
 396         free(data);
 397         return ALC_FALSE;
 398     }
 399
 400     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 401     if(!data->ring)
 402     {
 403         AL_PRINT("ring buffer create failed\n");
 404         close(data->fd);
 405         free(data);
 406         return ALC_FALSE;
 407     }
 408
 409     data->data_size = info.fragsize;
 410     data->mix_data = calloc(1, data->data_size);
 411
 412     device->ExtraData = data;
 413     data->thread = StartThread(OSSCaptureProc, device);
 414     if(data->thread == NULL)
 415     {
 416         device->ExtraData = NULL;
 417         free(data->mix_data);
 418         free(data);
 419         return ALC_FALSE;
 420     }
 421
 422     device->szDeviceName = strdup(deviceName);
 423     return ALC_TRUE;
 424 }
 425
 426 static void oss_close_capture(ALCdevice *device)
 427 {
 428     oss_data *data = (oss_data*)device->ExtraData;
 429     data->killNow = 1;
 430     StopThread(data->thread);
 431
 432     close(data->fd);
 433
 434     DestroyRingBuffer(data->ring);
 435
 436     free(data->mix_data);
 437     free(data);
 438     device->ExtraData = NULL;
 439 }
 440
 441 static void oss_start_capture(ALCdevice *pDevice)
 442 {
 443     oss_data *data = (oss_data*)pDevice->ExtraData;
 444     data->doCapture = 1;
 445 }
 446
 447 static void oss_stop_capture(ALCdevice *pDevice)
 448 {
 449     oss_data *data = (oss_data*)pDevice->ExtraData;
 450     data->doCapture = 0;
 451 }
 452
 453 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 454 {
 455     oss_data *data = (oss_data*)pDevice->ExtraData;
 456     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 457         ReadRingBuffer(data->ring, pBuffer, lSamples);
 458     else
 459         alcSetError(pDevice, ALC_INVALID_VALUE);
 460 }
 461
 462 static ALCuint oss_available_samples(ALCdevice *pDevice)
 463 {
 464     oss_data *data = (oss_data*)pDevice->ExtraData;
 465     return RingBufferSize(data->ring);
 466 }
 467
 468 static ALuint64 oss_get_time(ALCdevice *Device)
 469 {
 470     return Device->SamplesPlayed * 1000000000 / Device->Frequency;
 471 }
 472
 473
 474 BackendFuncs oss_funcs = {
 475     oss_open_playback,
 476     oss_close_playback,
 477     oss_reset_playback,
 478     oss_stop_playback,
 479     oss_open_capture,
 480     oss_close_capture,
 481     oss_start_capture,
 482     oss_stop_capture,
 483     oss_capture_samples,
 484     oss_available_samples,
 485     oss_get_time
 486 };
 487
 488 void alc_oss_init(BackendFuncs *func_list)
 489 {
 490     *func_list = oss_funcs;
 491 }
 492
 493 void alc_oss_deinit(void)
 494 {
 495 }
 496
 497 void alc_oss_probe(int type)
 498 {
 499     if(type == DEVICE_PROBE)
 500     {
 501 #ifdef HAVE_STAT
 502         struct stat buf;
 503         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 504 #endif
 505             AppendDeviceList(oss_device);
 506     }
 507     else if(type == ALL_DEVICE_PROBE)
 508     {
 509 #ifdef HAVE_STAT
 510         struct stat buf;
 511         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 512 #endif
 513             AppendAllDeviceList(oss_device);
 514     }
 515     else if(type == CAPTURE_DEVICE_PROBE)
 516     {
 517 #ifdef HAVE_STAT
 518         struct stat buf;
 519         if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 520 #endif
 521             AppendCaptureDeviceList(oss_device);
 522     }
 523 }