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 *Device = (ALCdevice*)ptr;
  83     oss_data *data = (oss_data*)Device->ExtraData;
  84     ALint frameSize;
  85     ssize_t wrote;
  86
  87     SetRTPriority();
  88
  89     frameSize = FrameSizeFromDevFmt(Device->FmtChans, Device->FmtType);
  90
  91     while(!data->killNow && Device->Connected)
  92     {
  93         ALint len = data->data_size;
  94         ALubyte *WritePtr = data->mix_data;
  95
  96         aluMixData(Device, 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(Device);
 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 *Device = (ALCdevice*)ptr;
 124     oss_data *data = (oss_data*)Device->ExtraData;
 125     int frameSize;
 126     int amt;
 127
 128     SetRTPriority();
 129
 130     frameSize = FrameSizeFromDevFmt(Device->FmtChans, Device->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(Device);
 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->DeviceName = 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     SetDefaultChannelOrder(device);
 272
 273     return ALC_TRUE;
 274 }
 275
 276 static ALCboolean oss_start_playback(ALCdevice *device)
 277 {
 278     oss_data *data = (oss_data*)device->ExtraData;
 279
 280     data->data_size = device->UpdateSize * FrameSizeFromDevFmt(device->FmtChans, device->FmtType);
 281     data->mix_data = calloc(1, data->data_size);
 282
 283     data->thread = StartThread(OSSProc, device);
 284     if(data->thread == NULL)
 285     {
 286         free(data->mix_data);
 287         data->mix_data = NULL;
 288         return ALC_FALSE;
 289     }
 290
 291     return ALC_TRUE;
 292 }
 293
 294 static void oss_stop_playback(ALCdevice *device)
 295 {
 296     oss_data *data = (oss_data*)device->ExtraData;
 297
 298     if(!data->thread)
 299         return;
 300
 301     data->killNow = 1;
 302     StopThread(data->thread);
 303     data->thread = NULL;
 304
 305     data->killNow = 0;
 306     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 307         ERR("Error resetting device: %s\n", strerror(errno));
 308
 309     free(data->mix_data);
 310     data->mix_data = NULL;
 311 }
 312
 313
 314 static ALCenum oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 315 {
 316     int numFragmentsLogSize;
 317     int log2FragmentSize;
 318     unsigned int periods;
 319     audio_buf_info info;
 320     ALuint frameSize;
 321     int numChannels;
 322     oss_data *data;
 323     int ossFormat;
 324     int ossSpeed;
 325     char *err;
 326
 327     if(!deviceName)
 328         deviceName = oss_device;
 329     else if(strcmp(deviceName, oss_device) != 0)
 330         return ALC_INVALID_VALUE;
 331
 332     data = (oss_data*)calloc(1, sizeof(oss_data));
 333     data->killNow = 0;
 334
 335     data->fd = open(oss_capture, O_RDONLY);
 336     if(data->fd == -1)
 337     {
 338         free(data);
 339         ERR("Could not open %s: %s\n", oss_capture, strerror(errno));
 340         return ALC_INVALID_VALUE;
 341     }
 342
 343     switch(device->FmtType)
 344     {
 345         case DevFmtByte:
 346             ossFormat = AFMT_S8;
 347             break;
 348         case DevFmtUByte:
 349             ossFormat = AFMT_U8;
 350             break;
 351         case DevFmtShort:
 352             ossFormat = AFMT_S16_NE;
 353             break;
 354         case DevFmtUShort:
 355         case DevFmtInt:
 356         case DevFmtUInt:
 357         case DevFmtFloat:
 358             free(data);
 359             ERR("%s capture samples not supported\n", DevFmtTypeString(device->FmtType));
 360             return ALC_INVALID_VALUE;
 361     }
 362
 363     periods = 4;
 364     numChannels = ChannelsFromDevFmt(device->FmtChans);
 365     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 366     ossSpeed = device->Frequency;
 367     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 368                              frameSize / periods);
 369
 370     /* according to the OSS spec, 16 bytes are the minimum */
 371     if (log2FragmentSize < 4)
 372         log2FragmentSize = 4;
 373     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 374
 375 #define CHECKERR(func) if((func) < 0) {                                       \
 376     err = #func;                                                              \
 377     goto err;                                                                 \
 378 }
 379     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize));
 380     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
 381     CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
 382     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
 383     CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info));
 384     if(0)
 385     {
 386     err:
 387         ERR("%s failed: %s\n", err, strerror(errno));
 388         close(data->fd);
 389         free(data);
 390         return ALC_INVALID_VALUE;
 391     }
 392 #undef CHECKERR
 393
 394     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 395     {
 396         ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
 397         close(data->fd);
 398         free(data);
 399         return ALC_INVALID_VALUE;
 400     }
 401
 402     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 403          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 404          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 405     {
 406         ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
 407         close(data->fd);
 408         free(data);
 409         return ALC_INVALID_VALUE;
 410     }
 411
 412     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 413     if(!data->ring)
 414     {
 415         ERR("Ring buffer create failed\n");
 416         close(data->fd);
 417         free(data);
 418         return ALC_OUT_OF_MEMORY;
 419     }
 420
 421     data->data_size = info.fragsize;
 422     data->mix_data = calloc(1, data->data_size);
 423
 424     device->ExtraData = data;
 425     data->thread = StartThread(OSSCaptureProc, device);
 426     if(data->thread == NULL)
 427     {
 428         device->ExtraData = NULL;
 429         free(data->mix_data);
 430         free(data);
 431         return ALC_OUT_OF_MEMORY;
 432     }
 433
 434     device->DeviceName = strdup(deviceName);
 435     return ALC_NO_ERROR;
 436 }
 437
 438 static void oss_close_capture(ALCdevice *device)
 439 {
 440     oss_data *data = (oss_data*)device->ExtraData;
 441     data->killNow = 1;
 442     StopThread(data->thread);
 443
 444     close(data->fd);
 445
 446     DestroyRingBuffer(data->ring);
 447
 448     free(data->mix_data);
 449     free(data);
 450     device->ExtraData = NULL;
 451 }
 452
 453 static void oss_start_capture(ALCdevice *Device)
 454 {
 455     oss_data *data = (oss_data*)Device->ExtraData;
 456     data->doCapture = 1;
 457 }
 458
 459 static void oss_stop_capture(ALCdevice *Device)
 460 {
 461     oss_data *data = (oss_data*)Device->ExtraData;
 462     data->doCapture = 0;
 463 }
 464
 465 static ALCenum oss_capture_samples(ALCdevice *Device, ALCvoid *pBuffer, ALCuint lSamples)
 466 {
 467     oss_data *data = (oss_data*)Device->ExtraData;
 468     ReadRingBuffer(data->ring, pBuffer, lSamples);
 469     return ALC_NO_ERROR;
 470 }
 471
 472 static ALCuint oss_available_samples(ALCdevice *Device)
 473 {
 474     oss_data *data = (oss_data*)Device->ExtraData;
 475     return RingBufferSize(data->ring);
 476 }
 477
 478
 479 static ALint64 oss_get_latency(ALCdevice *device)
 480 {
 481     (void)device;
 482     return 0;
 483 }
 484
 485
 486 static const BackendFuncs oss_funcs = {
 487     oss_open_playback,
 488     oss_close_playback,
 489     oss_reset_playback,
 490     oss_start_playback,
 491     oss_stop_playback,
 492     oss_open_capture,
 493     oss_close_capture,
 494     oss_start_capture,
 495     oss_stop_capture,
 496     oss_capture_samples,
 497     oss_available_samples,
 498     ALCdevice_LockDefault,
 499     ALCdevice_UnlockDefault,
 500     oss_get_latency
 501 };
 502
 503 ALCboolean alc_oss_init(BackendFuncs *func_list)
 504 {
 505     ConfigValueStr("oss", "device", &oss_driver);
 506     ConfigValueStr("oss", "capture", &oss_capture);
 507
 508     *func_list = oss_funcs;
 509     return ALC_TRUE;
 510 }
 511
 512 void alc_oss_deinit(void)
 513 {
 514 }
 515
 516 void alc_oss_probe(enum DevProbe type)
 517 {
 518     switch(type)
 519     {
 520         case ALL_DEVICE_PROBE:
 521         {
 522 #ifdef HAVE_STAT
 523             struct stat buf;
 524             if(stat(oss_driver, &buf) == 0)
 525 #endif
 526                 AppendAllDevicesList(oss_device);
 527         }
 528         break;
 529
 530         case CAPTURE_DEVICE_PROBE:
 531         {
 532 #ifdef HAVE_STAT
 533             struct stat buf;
 534             if(stat(oss_capture, &buf) == 0)
 535 #endif
 536                 AppendCaptureDeviceList(oss_device);
 537         }
 538         break;
 539     }
 540 }