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 DevFmtFloat:
 210             device->FmtType = DevFmtShort;
 211             /* fall-through */
 212         case DevFmtShort:
 213             ossFormat = AFMT_S16_NE;
 214             break;
 215     }
 216
 217     periods = device->NumUpdates;
 218     numChannels = ChannelsFromDevFmt(device->FmtChans);
 219     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 220
 221     ossSpeed = device->Frequency;
 222     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 223
 224     /* according to the OSS spec, 16 bytes are the minimum */
 225     if (log2FragmentSize < 4)
 226         log2FragmentSize = 4;
 227     /* Subtract one period since the temp mixing buffer counts as one. Still
 228      * need at least two on the card, though. */
 229     if(periods > 2) periods--;
 230     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 231
 232 #define CHECKERR(func) if((func) < 0) {                                       \
 233     err = #func;                                                              \
 234     goto err;                                                                 \
 235 }
 236     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 237      * that's reported back via GETOSPACE */
 238     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 239     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
 240     CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
 241     CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
 242     CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info));
 243     if(0)
 244     {
 245     err:
 246         ERR("%s failed: %s\n", err, strerror(errno));
 247         return ALC_FALSE;
 248     }
 249 #undef CHECKERR
 250
 251     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 252     {
 253         ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
 254         return ALC_FALSE;
 255     }
 256
 257     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 258          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 259          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 260     {
 261         ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
 262         return ALC_FALSE;
 263     }
 264
 265     device->Frequency = ossSpeed;
 266     device->UpdateSize = info.fragsize / frameSize;
 267     device->NumUpdates = info.fragments + 1;
 268
 269     data->data_size = device->UpdateSize * frameSize;
 270     data->mix_data = calloc(1, data->data_size);
 271
 272     SetDefaultChannelOrder(device);
 273
 274     data->thread = StartThread(OSSProc, device);
 275     if(data->thread == NULL)
 276     {
 277         free(data->mix_data);
 278         data->mix_data = NULL;
 279         return ALC_FALSE;
 280     }
 281
 282     return ALC_TRUE;
 283 }
 284
 285 static void oss_stop_playback(ALCdevice *device)
 286 {
 287     oss_data *data = (oss_data*)device->ExtraData;
 288
 289     if(!data->thread)
 290         return;
 291
 292     data->killNow = 1;
 293     StopThread(data->thread);
 294     data->thread = NULL;
 295
 296     data->killNow = 0;
 297     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 298         ERR("Error resetting device: %s\n", strerror(errno));
 299
 300     free(data->mix_data);
 301     data->mix_data = NULL;
 302 }
 303
 304
 305 static ALCenum oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 306 {
 307     int numFragmentsLogSize;
 308     int log2FragmentSize;
 309     unsigned int periods;
 310     audio_buf_info info;
 311     ALuint frameSize;
 312     int numChannels;
 313     char driver[64];
 314     oss_data *data;
 315     int ossFormat;
 316     int ossSpeed;
 317     char *err;
 318
 319     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 320     driver[sizeof(driver)-1] = 0;
 321
 322     if(!deviceName)
 323         deviceName = oss_device;
 324     else if(strcmp(deviceName, oss_device) != 0)
 325         return ALC_INVALID_VALUE;
 326
 327     data = (oss_data*)calloc(1, sizeof(oss_data));
 328     data->killNow = 0;
 329
 330     data->fd = open(driver, O_RDONLY);
 331     if(data->fd == -1)
 332     {
 333         free(data);
 334         ERR("Could not open %s: %s\n", driver, strerror(errno));
 335         return ALC_INVALID_VALUE;
 336     }
 337
 338     switch(device->FmtType)
 339     {
 340         case DevFmtByte:
 341             ossFormat = AFMT_S8;
 342             break;
 343         case DevFmtUByte:
 344             ossFormat = AFMT_U8;
 345             break;
 346         case DevFmtShort:
 347             ossFormat = AFMT_S16_NE;
 348             break;
 349         case DevFmtUShort:
 350         case DevFmtFloat:
 351             free(data);
 352             ERR("%s capture samples not supported on OSS\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     *func_list = oss_funcs;
 488     return ALC_TRUE;
 489 }
 490
 491 void alc_oss_deinit(void)
 492 {
 493 }
 494
 495 void alc_oss_probe(enum DevProbe type)
 496 {
 497     switch(type)
 498     {
 499         case 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         break;
 508
 509         case ALL_DEVICE_PROBE:
 510         {
 511 #ifdef HAVE_STAT
 512             struct stat buf;
 513             if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 514 #endif
 515                 AppendAllDeviceList(oss_device);
 516         }
 517         break;
 518
 519         case CAPTURE_DEVICE_PROBE:
 520         {
 521 #ifdef HAVE_STAT
 522             struct stat buf;
 523             if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 524 #endif
 525                 AppendCaptureDeviceList(oss_device);
 526         }
 527         break;
 528     }
 529 }