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 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 = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
  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                     ERR("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 = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
 128
 129     while(!data->killNow)
 130     {
 131         amt = read(data->fd, data->mix_data, data->data_size);
 132         if(amt < 0)
 133         {
 134             ERR("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 ALCenum 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_INVALID_VALUE;
 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         ERR("Could not open %s: %s\n", 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     char driver[64];
 316     oss_data *data;
 317     int ossFormat;
 318     int ossSpeed;
 319     char *err;
 320
 321     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 322     driver[sizeof(driver)-1] = 0;
 323
 324     if(!deviceName)
 325         deviceName = oss_device;
 326     else if(strcmp(deviceName, oss_device) != 0)
 327         return ALC_INVALID_VALUE;
 328
 329     data = (oss_data*)calloc(1, sizeof(oss_data));
 330     data->killNow = 0;
 331
 332     data->fd = open(driver, O_RDONLY);
 333     if(data->fd == -1)
 334     {
 335         free(data);
 336         ERR("Could not open %s: %s\n", driver, strerror(errno));
 337         return ALC_INVALID_VALUE;
 338     }
 339
 340     switch(device->FmtType)
 341     {
 342         case DevFmtByte:
 343             ossFormat = AFMT_S8;
 344             break;
 345         case DevFmtUByte:
 346             ossFormat = AFMT_U8;
 347             break;
 348         case DevFmtShort:
 349             ossFormat = AFMT_S16_NE;
 350             break;
 351         case DevFmtUShort:
 352         case DevFmtInt:
 353         case DevFmtUInt:
 354         case DevFmtFloat:
 355             free(data);
 356             ERR("%s capture samples not supported on OSS\n", DevFmtTypeString(device->FmtType));
 357             return ALC_INVALID_VALUE;
 358     }
 359
 360     periods = 4;
 361     numChannels = ChannelsFromDevFmt(device->FmtChans);
 362     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 363     ossSpeed = device->Frequency;
 364     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 365                              frameSize / periods);
 366
 367     /* according to the OSS spec, 16 bytes are the minimum */
 368     if (log2FragmentSize < 4)
 369         log2FragmentSize = 4;
 370     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 371
 372 #define CHECKERR(func) if((func) < 0) {                                       \
 373     err = #func;                                                              \
 374     goto err;                                                                 \
 375 }
 376     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize));
 377     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
 378     CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
 379     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
 380     CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info));
 381     if(0)
 382     {
 383     err:
 384         ERR("%s failed: %s\n", err, strerror(errno));
 385         close(data->fd);
 386         free(data);
 387         return ALC_INVALID_VALUE;
 388     }
 389 #undef CHECKERR
 390
 391     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 392     {
 393         ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
 394         close(data->fd);
 395         free(data);
 396         return ALC_INVALID_VALUE;
 397     }
 398
 399     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 400          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 401          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 402     {
 403         ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
 404         close(data->fd);
 405         free(data);
 406         return ALC_INVALID_VALUE;
 407     }
 408
 409     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 410     if(!data->ring)
 411     {
 412         ERR("Ring buffer create failed\n");
 413         close(data->fd);
 414         free(data);
 415         return ALC_OUT_OF_MEMORY;
 416     }
 417
 418     data->data_size = info.fragsize;
 419     data->mix_data = calloc(1, data->data_size);
 420
 421     device->ExtraData = data;
 422     data->thread = StartThread(OSSCaptureProc, device);
 423     if(data->thread == NULL)
 424     {
 425         device->ExtraData = NULL;
 426         free(data->mix_data);
 427         free(data);
 428         return ALC_OUT_OF_MEMORY;
 429     }
 430
 431     device->szDeviceName = strdup(deviceName);
 432     return ALC_NO_ERROR;
 433 }
 434
 435 static void oss_close_capture(ALCdevice *device)
 436 {
 437     oss_data *data = (oss_data*)device->ExtraData;
 438     data->killNow = 1;
 439     StopThread(data->thread);
 440
 441     close(data->fd);
 442
 443     DestroyRingBuffer(data->ring);
 444
 445     free(data->mix_data);
 446     free(data);
 447     device->ExtraData = NULL;
 448 }
 449
 450 static void oss_start_capture(ALCdevice *pDevice)
 451 {
 452     oss_data *data = (oss_data*)pDevice->ExtraData;
 453     data->doCapture = 1;
 454 }
 455
 456 static void oss_stop_capture(ALCdevice *pDevice)
 457 {
 458     oss_data *data = (oss_data*)pDevice->ExtraData;
 459     data->doCapture = 0;
 460 }
 461
 462 static ALCenum oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 463 {
 464     oss_data *data = (oss_data*)pDevice->ExtraData;
 465     ReadRingBuffer(data->ring, pBuffer, lSamples);
 466     return ALC_NO_ERROR;
 467 }
 468
 469 static ALCuint oss_available_samples(ALCdevice *pDevice)
 470 {
 471     oss_data *data = (oss_data*)pDevice->ExtraData;
 472     return RingBufferSize(data->ring);
 473 }
 474
 475
 476 static const BackendFuncs oss_funcs = {
 477     oss_open_playback,
 478     oss_close_playback,
 479     oss_reset_playback,
 480     oss_stop_playback,
 481     oss_open_capture,
 482     oss_close_capture,
 483     oss_start_capture,
 484     oss_stop_capture,
 485     oss_capture_samples,
 486     oss_available_samples
 487 };
 488
 489 ALCboolean alc_oss_init(BackendFuncs *func_list)
 490 {
 491     *func_list = oss_funcs;
 492     return ALC_TRUE;
 493 }
 494
 495 void alc_oss_deinit(void)
 496 {
 497 }
 498
 499 void alc_oss_probe(enum DevProbe type)
 500 {
 501     switch(type)
 502     {
 503         case ALL_DEVICE_PROBE:
 504         {
 505 #ifdef HAVE_STAT
 506             struct stat buf;
 507             if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 508 #endif
 509                 AppendAllDeviceList(oss_device);
 510         }
 511         break;
 512
 513         case CAPTURE_DEVICE_PROBE:
 514         {
 515 #ifdef HAVE_STAT
 516             struct stat buf;
 517             if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 518 #endif
 519                 AppendCaptureDeviceList(oss_device);
 520         }
 521         break;
 522     }
 523 }