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 Software";
  51 static const ALCchar oss_device_capture[] = "OSS Capture";
  52
  53 typedef struct {
  54     int fd;
  55     volatile int killNow;
  56     ALvoid *thread;
  57
  58     ALubyte *mix_data;
  59     int data_size;
  60
  61     RingBuffer *ring;
  62     int doCapture;
  63 } oss_data;
  64
  65
  66 static int log2i(ALCuint x)
  67 {
  68     int y = 0;
  69     while (x > 1)
  70     {
  71         x >>= 1;
  72         y++;
  73     }
  74     return y;
  75 }
  76
  77
  78 static ALuint OSSProc(ALvoid *ptr)
  79 {
  80     ALCdevice *pDevice = (ALCdevice*)ptr;
  81     oss_data *data = (oss_data*)pDevice->ExtraData;
  82     ALint frameSize;
  83     ssize_t wrote;
  84
  85     SetRTPriority();
  86
  87     frameSize = aluChannelsFromFormat(pDevice->Format) *
  88                 aluBytesFromFormat(pDevice->Format);
  89
  90     while(!data->killNow && pDevice->Connected)
  91     {
  92         ALint len = data->data_size;
  93         ALubyte *WritePtr = data->mix_data;
  94
  95         aluMixData(pDevice, WritePtr, len/frameSize);
  96         while(len > 0 && !data->killNow)
  97         {
  98             wrote = write(data->fd, WritePtr, len);
  99             if(wrote < 0)
 100             {
 101                 if(errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
 102                 {
 103                     AL_PRINT("write failed: %s\n", strerror(errno));
 104                     aluHandleDisconnect(pDevice);
 105                     break;
 106                 }
 107
 108                 Sleep(1);
 109                 continue;
 110             }
 111
 112             len -= wrote;
 113             WritePtr += wrote;
 114         }
 115     }
 116
 117     return 0;
 118 }
 119
 120 static ALuint OSSCaptureProc(ALvoid *ptr)
 121 {
 122     ALCdevice *pDevice = (ALCdevice*)ptr;
 123     oss_data *data = (oss_data*)pDevice->ExtraData;
 124     int frameSize;
 125     int amt;
 126
 127     SetRTPriority();
 128
 129     frameSize  = aluBytesFromFormat(pDevice->Format);
 130     frameSize *= aluChannelsFromFormat(pDevice->Format);
 131
 132     while(!data->killNow)
 133     {
 134         amt = read(data->fd, data->mix_data, data->data_size);
 135         if(amt < 0)
 136         {
 137             AL_PRINT("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 ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 154 {
 155     char driver[64];
 156     oss_data *data;
 157
 158     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 159     driver[sizeof(driver)-1] = 0;
 160     if(!deviceName)
 161         deviceName = oss_device;
 162     else if(strcmp(deviceName, oss_device) != 0)
 163         return ALC_FALSE;
 164
 165     data = (oss_data*)calloc(1, sizeof(oss_data));
 166     data->killNow = 0;
 167
 168     data->fd = open(driver, O_WRONLY);
 169     if(data->fd == -1)
 170     {
 171         free(data);
 172         if(errno != ENOENT)
 173             AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 174         return ALC_FALSE;
 175     }
 176
 177     device->szDeviceName = strdup(deviceName);
 178     device->ExtraData = data;
 179     return ALC_TRUE;
 180 }
 181
 182 static void oss_close_playback(ALCdevice *device)
 183 {
 184     oss_data *data = (oss_data*)device->ExtraData;
 185
 186     close(data->fd);
 187     free(data);
 188     device->ExtraData = NULL;
 189 }
 190
 191 static ALCboolean oss_reset_playback(ALCdevice *device)
 192 {
 193     oss_data *data = (oss_data*)device->ExtraData;
 194     int numFragmentsLogSize;
 195     int log2FragmentSize;
 196     unsigned int periods;
 197     audio_buf_info info;
 198     ALuint frameSize;
 199     int numChannels;
 200     int ossFormat;
 201     int ossSpeed;
 202     char *err;
 203     int i;
 204
 205     switch(aluBytesFromFormat(device->Format))
 206     {
 207         case 1:
 208             ossFormat = AFMT_U8;
 209             break;
 210         case 4:
 211             switch(aluChannelsFromFormat(device->Format))
 212             {
 213                 case 1: device->Format = AL_FORMAT_MONO16; break;
 214                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 215                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 216                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 217                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 218                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 219             }
 220             /* fall-through */
 221         case 2:
 222             ossFormat = AFMT_S16_NE;
 223             break;
 224         default:
 225             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 226             return ALC_FALSE;
 227     }
 228
 229     periods = device->NumUpdates;
 230     numChannels = aluChannelsFromFormat(device->Format);
 231     frameSize = numChannels * aluBytesFromFormat(device->Format);
 232
 233     ossSpeed = device->Frequency;
 234     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 235
 236     /* according to the OSS spec, 16 bytes are the minimum */
 237     if (log2FragmentSize < 4)
 238         log2FragmentSize = 4;
 239     /* Subtract one period since the temp mixing buffer counts as one. Still
 240      * need at least two on the card, though. */
 241     if(periods > 2) periods--;
 242     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 243
 244 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 245     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 246      * that's reported back via GETOSPACE */
 247     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 248     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 249           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 250           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 251           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 252     {
 253         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 254         return ALC_FALSE;
 255     }
 256 #undef ok
 257
 258     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 259     {
 260         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 261         return ALC_FALSE;
 262     }
 263
 264     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 265          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 266     {
 267         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 268         return ALC_FALSE;
 269     }
 270
 271     device->Frequency = ossSpeed;
 272     device->UpdateSize = info.fragsize / frameSize;
 273     device->NumUpdates = info.fragments + 1;
 274
 275     data->data_size = device->UpdateSize * frameSize;
 276     data->mix_data = calloc(1, data->data_size);
 277
 278     SetDefaultChannelOrder(device);
 279
 280     data->thread = StartThread(OSSProc, device);
 281     if(data->thread == NULL)
 282     {
 283         free(data->mix_data);
 284         data->mix_data = NULL;
 285         return ALC_FALSE;
 286     }
 287
 288     return ALC_TRUE;
 289 }
 290
 291 static void oss_stop_playback(ALCdevice *device)
 292 {
 293     oss_data *data = (oss_data*)device->ExtraData;
 294
 295     if(!data->thread)
 296         return;
 297
 298     data->killNow = 1;
 299     StopThread(data->thread);
 300     data->thread = NULL;
 301
 302     data->killNow = 0;
 303     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 304         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 305
 306     free(data->mix_data);
 307     data->mix_data = NULL;
 308 }
 309
 310
 311 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 312 {
 313     int numFragmentsLogSize;
 314     int log2FragmentSize;
 315     unsigned int periods;
 316     audio_buf_info info;
 317     ALuint frameSize;
 318     int numChannels;
 319     char driver[64];
 320     oss_data *data;
 321     int ossFormat;
 322     int ossSpeed;
 323     char *err;
 324     int i;
 325
 326     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 327     driver[sizeof(driver)-1] = 0;
 328     if(!deviceName)
 329         deviceName = oss_device_capture;
 330     else if(strcmp(deviceName, oss_device_capture) != 0)
 331         return ALC_FALSE;
 332
 333     data = (oss_data*)calloc(1, sizeof(oss_data));
 334     data->killNow = 0;
 335
 336     data->fd = open(driver, O_RDONLY);
 337     if(data->fd == -1)
 338     {
 339         free(data);
 340         if(errno != ENOENT)
 341             AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 342         return ALC_FALSE;
 343     }
 344
 345     switch(aluBytesFromFormat(device->Format))
 346     {
 347         case 1:
 348             ossFormat = AFMT_U8;
 349             break;
 350         case 2:
 351             ossFormat = AFMT_S16_NE;
 352             break;
 353         default:
 354             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 355             close(data->fd);
 356             free(data);
 357             return ALC_FALSE;
 358     }
 359
 360     periods = 4;
 361     numChannels = aluChannelsFromFormat(device->Format);
 362     frameSize = numChannels * aluBytesFromFormat(device->Format);
 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 ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 373     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 374           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 375           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 376           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 377           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 378     {
 379         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 380         close(data->fd);
 381         free(data);
 382         return ALC_FALSE;
 383     }
 384 #undef ok
 385
 386     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 387     {
 388         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 389         close(data->fd);
 390         free(data);
 391         return ALC_FALSE;
 392     }
 393
 394     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 395          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 396     {
 397         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 398         close(data->fd);
 399         free(data);
 400         return ALC_FALSE;
 401     }
 402
 403     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 404     if(!data->ring)
 405     {
 406         AL_PRINT("ring buffer create failed\n");
 407         close(data->fd);
 408         free(data);
 409         return ALC_FALSE;
 410     }
 411
 412     data->data_size = info.fragsize;
 413     data->mix_data = calloc(1, data->data_size);
 414
 415     device->ExtraData = data;
 416     data->thread = StartThread(OSSCaptureProc, device);
 417     if(data->thread == NULL)
 418     {
 419         device->ExtraData = NULL;
 420         free(data->mix_data);
 421         free(data);
 422         return ALC_FALSE;
 423     }
 424
 425     device->szDeviceName = strdup(deviceName);
 426     return ALC_TRUE;
 427 }
 428
 429 static void oss_close_capture(ALCdevice *device)
 430 {
 431     oss_data *data = (oss_data*)device->ExtraData;
 432     data->killNow = 1;
 433     StopThread(data->thread);
 434
 435     close(data->fd);
 436
 437     DestroyRingBuffer(data->ring);
 438
 439     free(data->mix_data);
 440     free(data);
 441     device->ExtraData = NULL;
 442 }
 443
 444 static void oss_start_capture(ALCdevice *pDevice)
 445 {
 446     oss_data *data = (oss_data*)pDevice->ExtraData;
 447     data->doCapture = 1;
 448 }
 449
 450 static void oss_stop_capture(ALCdevice *pDevice)
 451 {
 452     oss_data *data = (oss_data*)pDevice->ExtraData;
 453     data->doCapture = 0;
 454 }
 455
 456 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 457 {
 458     oss_data *data = (oss_data*)pDevice->ExtraData;
 459     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 460         ReadRingBuffer(data->ring, pBuffer, lSamples);
 461     else
 462         alcSetError(pDevice, ALC_INVALID_VALUE);
 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 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 void alc_oss_init(BackendFuncs *func_list)
 486 {
 487     *func_list = oss_funcs;
 488 }
 489
 490 void alc_oss_deinit(void)
 491 {
 492 }
 493
 494 void alc_oss_probe(int type)
 495 {
 496     if(type == DEVICE_PROBE)
 497     {
 498 #ifdef HAVE_STAT
 499         struct stat buf;
 500         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 501 #endif
 502             AppendDeviceList(oss_device);
 503     }
 504     else if(type == ALL_DEVICE_PROBE)
 505     {
 506 #ifdef HAVE_STAT
 507         struct stat buf;
 508         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 509 #endif
 510             AppendAllDeviceList(oss_device);
 511     }
 512     else if(type == CAPTURE_DEVICE_PROBE)
 513     {
 514 #ifdef HAVE_STAT
 515         struct stat buf;
 516         if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 517 #endif
 518             AppendCaptureDeviceList(oss_device_capture);
 519     }
 520 }