Alc/backends/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 static const char *oss_driver = "/dev/dsp";
  53 static const char *oss_capture = "/dev/dsp";
  54
  55 typedef struct {
  56     int fd;
  57     volatile int killNow;
  58     ALvoid *thread;
  59
  60     ALubyte *mix_data;
  61     int data_size;
  62
  63     RingBuffer *ring;
  64     int doCapture;
  65 } oss_data;
  66
  67
  68 static int log2i(ALCuint x)
  69 {
  70     int y = 0;
  71     while (x > 1)
  72     {
  73         x >>= 1;
  74         y++;
  75     }
  76     return y;
  77 }
  78
  79
  80 static ALuint OSSProc(ALvoid *ptr)
  81 {
  82     ALCdevice *pDevice = (ALCdevice*)ptr;
  83     oss_data *data = (oss_data*)pDevice->ExtraData;
  84     ALint frameSize;
  85     ssize_t wrote;
  86
  87     SetRTPriority();
  88
  89     frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
  90
  91     while(!data->killNow && pDevice->Connected)
  92     {
  93         ALint len = data->data_size;
  94         ALubyte *WritePtr = data->mix_data;
  95
  96         aluMixData(pDevice, WritePtr, len/frameSize);
  97         while(len > 0 && !data->killNow)
  98         {
  99             wrote = write(data->fd, WritePtr, len);
 100             if(wrote < 0)
 101             {
 102                 if(errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
 103                 {
 104                     ERR("write failed: %s\n", strerror(errno));
 105                     aluHandleDisconnect(pDevice);
 106                     break;
 107                 }
 108
 109                 Sleep(1);
 110                 continue;
 111             }
 112
 113             len -= wrote;
 114             WritePtr += wrote;
 115         }
 116     }
 117
 118     return 0;
 119 }
 120
 121 static ALuint OSSCaptureProc(ALvoid *ptr)
 122 {
 123     ALCdevice *pDevice = (ALCdevice*)ptr;
 124     oss_data *data = (oss_data*)pDevice->ExtraData;
 125     int frameSize;
 126     int amt;
 127
 128     SetRTPriority();
 129
 130     frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
 131
 132     while(!data->killNow)
 133     {
 134         amt = read(data->fd, data->mix_data, data->data_size);
 135         if(amt < 0)
 136         {
 137             ERR("read failed: %s\n", strerror(errno));
 138             aluHandleDisconnect(pDevice);
 139             break;
 140         }
 141         if(amt == 0)
 142         {
 143             Sleep(1);
 144             continue;
 145         }
 146         if(data->doCapture)
 147             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 148     }
 149
 150     return 0;
 151 }
 152
 153 static ALCenum oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 154 {
 155     oss_data *data;
 156
 157     if(!deviceName)
 158         deviceName = oss_device;
 159     else if(strcmp(deviceName, oss_device) != 0)
 160         return ALC_INVALID_VALUE;
 161
 162     data = (oss_data*)calloc(1, sizeof(oss_data));
 163     data->killNow = 0;
 164
 165     data->fd = open(oss_driver, O_WRONLY);
 166     if(data->fd == -1)
 167     {
 168         free(data);
 169         ERR("Could not open %s: %s\n", oss_driver, strerror(errno));
 170         return ALC_INVALID_VALUE;
 171     }
 172
 173     device->szDeviceName = strdup(deviceName);
 174     device->ExtraData = data;
 175     return ALC_NO_ERROR;
 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
 200     switch(device->FmtType)
 201     {
 202         case DevFmtByte:
 203             ossFormat = AFMT_S8;
 204             break;
 205         case DevFmtUByte:
 206             ossFormat = AFMT_U8;
 207             break;
 208         case DevFmtUShort:
 209         case DevFmtInt:
 210         case DevFmtUInt:
 211         case DevFmtFloat:
 212             device->FmtType = DevFmtShort;
 213             /* fall-through */
 214         case DevFmtShort:
 215             ossFormat = AFMT_S16_NE;
 216             break;
 217     }
 218
 219     periods = device->NumUpdates;
 220     numChannels = ChannelsFromDevFmt(device->FmtChans);
 221     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 222
 223     ossSpeed = device->Frequency;
 224     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 225
 226     /* according to the OSS spec, 16 bytes are the minimum */
 227     if (log2FragmentSize < 4)
 228         log2FragmentSize = 4;
 229     /* Subtract one period since the temp mixing buffer counts as one. Still
 230      * need at least two on the card, though. */
 231     if(periods > 2) periods--;
 232     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 233
 234 #define CHECKERR(func) if((func) < 0) {                                       \
 235     err = #func;                                                              \
 236     goto err;                                                                 \
 237 }
 238     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 239      * that's reported back via GETOSPACE */
 240     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 241     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
 242     CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
 243     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
 244     CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info));
 245     if(0)
 246     {
 247     err:
 248         ERR("%s failed: %s\n", err, strerror(errno));
 249         return ALC_FALSE;
 250     }
 251 #undef CHECKERR
 252
 253     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 254     {
 255         ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
 256         return ALC_FALSE;
 257     }
 258
 259     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 260          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 261          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 262     {
 263         ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
 264         return ALC_FALSE;
 265     }
 266
 267     device->Frequency = ossSpeed;
 268     device->UpdateSize = info.fragsize / frameSize;
 269     device->NumUpdates = info.fragments + 1;
 270
 271     data->data_size = device->UpdateSize * frameSize;
 272     data->mix_data = calloc(1, data->data_size);
 273
 274     SetDefaultChannelOrder(device);
 275
 276     data->thread = StartThread(OSSProc, device);
 277     if(data->thread == NULL)
 278     {
 279         free(data->mix_data);
 280         data->mix_data = NULL;
 281         return ALC_FALSE;
 282     }
 283
 284     return ALC_TRUE;
 285 }
 286
 287 static void oss_stop_playback(ALCdevice *device)
 288 {
 289     oss_data *data = (oss_data*)device->ExtraData;
 290
 291     if(!data->thread)
 292         return;
 293
 294     data->killNow = 1;
 295     StopThread(data->thread);
 296     data->thread = NULL;
 297
 298     data->killNow = 0;
 299     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 300         ERR("Error resetting device: %s\n", strerror(errno));
 301
 302     free(data->mix_data);
 303     data->mix_data = NULL;
 304 }
 305
 306
 307 static ALCenum oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 308 {
 309     int numFragmentsLogSize;
 310     int log2FragmentSize;
 311     unsigned int periods;
 312     audio_buf_info info;
 313     ALuint frameSize;
 314     int numChannels;
 315     oss_data *data;
 316     int ossFormat;
 317     int ossSpeed;
 318     char *err;
 319
 320     if(!deviceName)
 321         deviceName = oss_device;
 322     else if(strcmp(deviceName, oss_device) != 0)
 323         return ALC_INVALID_VALUE;
 324
 325     data = (oss_data*)calloc(1, sizeof(oss_data));
 326     data->killNow = 0;
 327
 328     data->fd = open(oss_capture, O_RDONLY);
 329     if(data->fd == -1)
 330     {
 331         free(data);
 332         ERR("Could not open %s: %s\n", oss_capture, strerror(errno));
 333         return ALC_INVALID_VALUE;
 334     }
 335
 336     switch(device->FmtType)
 337     {
 338         case DevFmtByte:
 339             ossFormat = AFMT_S8;
 340             break;
 341         case DevFmtUByte:
 342             ossFormat = AFMT_U8;
 343             break;
 344         case DevFmtShort:
 345             ossFormat = AFMT_S16_NE;
 346             break;
 347         case DevFmtUShort:
 348         case DevFmtInt:
 349         case DevFmtUInt:
 350         case DevFmtFloat:
 351             free(data);
 352             ERR("%s capture samples not supported\n", DevFmtTypeString(device->FmtType));
 353             return ALC_INVALID_VALUE;
 354     }
 355
 356     periods = 4;
 357     numChannels = ChannelsFromDevFmt(device->FmtChans);
 358     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 359     ossSpeed = device->Frequency;
 360     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 361                              frameSize / periods);
 362
 363     /* according to the OSS spec, 16 bytes are the minimum */
 364     if (log2FragmentSize < 4)
 365         log2FragmentSize = 4;
 366     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 367
 368 #define CHECKERR(func) if((func) < 0) {                                       \
 369     err = #func;                                                              \
 370     goto err;                                                                 \
 371 }
 372     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize));
 373     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
 374     CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
 375     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
 376     CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info));
 377     if(0)
 378     {
 379     err:
 380         ERR("%s failed: %s\n", err, strerror(errno));
 381         close(data->fd);
 382         free(data);
 383         return ALC_INVALID_VALUE;
 384     }
 385 #undef CHECKERR
 386
 387     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 388     {
 389         ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
 390         close(data->fd);
 391         free(data);
 392         return ALC_INVALID_VALUE;
 393     }
 394
 395     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 396          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 397          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 398     {
 399         ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
 400         close(data->fd);
 401         free(data);
 402         return ALC_INVALID_VALUE;
 403     }
 404
 405     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 406     if(!data->ring)
 407     {
 408         ERR("Ring buffer create failed\n");
 409         close(data->fd);
 410         free(data);
 411         return ALC_OUT_OF_MEMORY;
 412     }
 413
 414     data->data_size = info.fragsize;
 415     data->mix_data = calloc(1, data->data_size);
 416
 417     device->ExtraData = data;
 418     data->thread = StartThread(OSSCaptureProc, device);
 419     if(data->thread == NULL)
 420     {
 421         device->ExtraData = NULL;
 422         free(data->mix_data);
 423         free(data);
 424         return ALC_OUT_OF_MEMORY;
 425     }
 426
 427     device->szDeviceName = strdup(deviceName);
 428     return ALC_NO_ERROR;
 429 }
 430
 431 static void oss_close_capture(ALCdevice *device)
 432 {
 433     oss_data *data = (oss_data*)device->ExtraData;
 434     data->killNow = 1;
 435     StopThread(data->thread);
 436
 437     close(data->fd);
 438
 439     DestroyRingBuffer(data->ring);
 440
 441     free(data->mix_data);
 442     free(data);
 443     device->ExtraData = NULL;
 444 }
 445
 446 static void oss_start_capture(ALCdevice *pDevice)
 447 {
 448     oss_data *data = (oss_data*)pDevice->ExtraData;
 449     data->doCapture = 1;
 450 }
 451
 452 static void oss_stop_capture(ALCdevice *pDevice)
 453 {
 454     oss_data *data = (oss_data*)pDevice->ExtraData;
 455     data->doCapture = 0;
 456 }
 457
 458 static ALCenum oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 459 {
 460     oss_data *data = (oss_data*)pDevice->ExtraData;
 461     ReadRingBuffer(data->ring, pBuffer, lSamples);
 462     return ALC_NO_ERROR;
 463 }
 464
 465 static ALCuint oss_available_samples(ALCdevice *pDevice)
 466 {
 467     oss_data *data = (oss_data*)pDevice->ExtraData;
 468     return RingBufferSize(data->ring);
 469 }
 470
 471
 472 static const BackendFuncs oss_funcs = {
 473     oss_open_playback,
 474     oss_close_playback,
 475     oss_reset_playback,
 476     oss_stop_playback,
 477     oss_open_capture,
 478     oss_close_capture,
 479     oss_start_capture,
 480     oss_stop_capture,
 481     oss_capture_samples,
 482     oss_available_samples
 483 };
 484
 485 ALCboolean alc_oss_init(BackendFuncs *func_list)
 486 {
 487     ConfigValueStr("oss", "device", &oss_driver);
 488     ConfigValueStr("oss", "capture", &oss_capture);
 489
 490     *func_list = oss_funcs;
 491     return ALC_TRUE;
 492 }
 493
 494 void alc_oss_deinit(void)
 495 {
 496 }
 497
 498 void alc_oss_probe(enum DevProbe type)
 499 {
 500     switch(type)
 501     {
 502         case ALL_DEVICE_PROBE:
 503         {
 504 #ifdef HAVE_STAT
 505             struct stat buf;
 506             if(stat(oss_device, &buf) == 0)
 507 #endif
 508                 AppendAllDeviceList(oss_device);
 509         }
 510         break;
 511
 512         case CAPTURE_DEVICE_PROBE:
 513         {
 514 #ifdef HAVE_STAT
 515             struct stat buf;
 516             if(stat(oss_capture, &buf) == 0)
 517 #endif
 518                 AppendCaptureDeviceList(oss_device);
 519         }
 520         break;
 521     }
 522 }