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 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 = aluFrameSizeFromFormat(pDevice->Format);
  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                     AL_PRINT("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 = aluFrameSizeFromFormat(pDevice->Format);
 128
 129     while(!data->killNow)
 130     {
 131         amt = read(data->fd, data->mix_data, data->data_size);
 132         if(amt < 0)
 133         {
 134             AL_PRINT("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 ALCboolean 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_FALSE;
 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         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 170         return ALC_FALSE;
 171     }
 172
 173     device->szDeviceName = strdup(deviceName);
 174     device->ExtraData = data;
 175     return ALC_TRUE;
 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     int i;
 200
 201     switch(aluBytesFromFormat(device->Format))
 202     {
 203         case 1:
 204             ossFormat = AFMT_U8;
 205             break;
 206         case 4:
 207             switch(aluChannelsFromFormat(device->Format))
 208             {
 209                 case 1: device->Format = AL_FORMAT_MONO16; break;
 210                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 211                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 212                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 213                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 214                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 215             }
 216             /* fall-through */
 217         case 2:
 218             ossFormat = AFMT_S16_NE;
 219             break;
 220         default:
 221             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 222             return ALC_FALSE;
 223     }
 224
 225     periods = device->NumUpdates;
 226     numChannels = aluChannelsFromFormat(device->Format);
 227     frameSize = numChannels * aluBytesFromFormat(device->Format);
 228
 229     ossSpeed = device->Frequency;
 230     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 231
 232     /* according to the OSS spec, 16 bytes are the minimum */
 233     if (log2FragmentSize < 4)
 234         log2FragmentSize = 4;
 235     /* Subtract one period since the temp mixing buffer counts as one. Still
 236      * need at least two on the card, though. */
 237     if(periods > 2) periods--;
 238     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 239
 240 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 241     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 242      * that's reported back via GETOSPACE */
 243     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 244     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 245           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 246           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 247           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 248     {
 249         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 250         return ALC_FALSE;
 251     }
 252 #undef ok
 253
 254     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 255     {
 256         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 257         return ALC_FALSE;
 258     }
 259
 260     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 261          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 262     {
 263         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, 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         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 301
 302     free(data->mix_data);
 303     data->mix_data = NULL;
 304 }
 305
 306
 307 static ALCboolean 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     int i;
 321
 322     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 323     driver[sizeof(driver)-1] = 0;
 324     if(!deviceName)
 325         deviceName = oss_device;
 326     else if(strcmp(deviceName, oss_device) != 0)
 327         return ALC_FALSE;
 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         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 337         return ALC_FALSE;
 338     }
 339
 340     switch(aluBytesFromFormat(device->Format))
 341     {
 342         case 1:
 343             ossFormat = AFMT_U8;
 344             break;
 345         case 2:
 346             ossFormat = AFMT_S16_NE;
 347             break;
 348         default:
 349             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 350             close(data->fd);
 351             free(data);
 352             return ALC_FALSE;
 353     }
 354
 355     periods = 4;
 356     numChannels = aluChannelsFromFormat(device->Format);
 357     frameSize = numChannels * aluBytesFromFormat(device->Format);
 358     ossSpeed = device->Frequency;
 359     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 360                              frameSize / periods);
 361
 362     /* according to the OSS spec, 16 bytes are the minimum */
 363     if (log2FragmentSize < 4)
 364         log2FragmentSize = 4;
 365     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 366
 367 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 368     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 369           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 370           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 371           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 372           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 373     {
 374         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 375         close(data->fd);
 376         free(data);
 377         return ALC_FALSE;
 378     }
 379 #undef ok
 380
 381     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 382     {
 383         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 384         close(data->fd);
 385         free(data);
 386         return ALC_FALSE;
 387     }
 388
 389     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 390          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 391     {
 392         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 393         close(data->fd);
 394         free(data);
 395         return ALC_FALSE;
 396     }
 397
 398     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 399     if(!data->ring)
 400     {
 401         AL_PRINT("ring buffer create failed\n");
 402         close(data->fd);
 403         free(data);
 404         return ALC_FALSE;
 405     }
 406
 407     data->data_size = info.fragsize;
 408     data->mix_data = calloc(1, data->data_size);
 409
 410     device->ExtraData = data;
 411     data->thread = StartThread(OSSCaptureProc, device);
 412     if(data->thread == NULL)
 413     {
 414         device->ExtraData = NULL;
 415         free(data->mix_data);
 416         free(data);
 417         return ALC_FALSE;
 418     }
 419
 420     device->szDeviceName = strdup(deviceName);
 421     return ALC_TRUE;
 422 }
 423
 424 static void oss_close_capture(ALCdevice *device)
 425 {
 426     oss_data *data = (oss_data*)device->ExtraData;
 427     data->killNow = 1;
 428     StopThread(data->thread);
 429
 430     close(data->fd);
 431
 432     DestroyRingBuffer(data->ring);
 433
 434     free(data->mix_data);
 435     free(data);
 436     device->ExtraData = NULL;
 437 }
 438
 439 static void oss_start_capture(ALCdevice *pDevice)
 440 {
 441     oss_data *data = (oss_data*)pDevice->ExtraData;
 442     data->doCapture = 1;
 443 }
 444
 445 static void oss_stop_capture(ALCdevice *pDevice)
 446 {
 447     oss_data *data = (oss_data*)pDevice->ExtraData;
 448     data->doCapture = 0;
 449 }
 450
 451 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 452 {
 453     oss_data *data = (oss_data*)pDevice->ExtraData;
 454     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 455         ReadRingBuffer(data->ring, pBuffer, lSamples);
 456     else
 457         alcSetError(pDevice, ALC_INVALID_VALUE);
 458 }
 459
 460 static ALCuint oss_available_samples(ALCdevice *pDevice)
 461 {
 462     oss_data *data = (oss_data*)pDevice->ExtraData;
 463     return RingBufferSize(data->ring);
 464 }
 465
 466
 467 BackendFuncs oss_funcs = {
 468     oss_open_playback,
 469     oss_close_playback,
 470     oss_reset_playback,
 471     oss_stop_playback,
 472     oss_open_capture,
 473     oss_close_capture,
 474     oss_start_capture,
 475     oss_stop_capture,
 476     oss_capture_samples,
 477     oss_available_samples
 478 };
 479
 480 void alc_oss_init(BackendFuncs *func_list)
 481 {
 482     *func_list = oss_funcs;
 483 }
 484
 485 void alc_oss_deinit(void)
 486 {
 487 }
 488
 489 void alc_oss_probe(int type)
 490 {
 491     if(type == DEVICE_PROBE)
 492     {
 493 #ifdef HAVE_STAT
 494         struct stat buf;
 495         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 496 #endif
 497             AppendDeviceList(oss_device);
 498     }
 499     else if(type == ALL_DEVICE_PROBE)
 500     {
 501 #ifdef HAVE_STAT
 502         struct stat buf;
 503         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 504 #endif
 505             AppendAllDeviceList(oss_device);
 506     }
 507     else if(type == CAPTURE_DEVICE_PROBE)
 508     {
 509 #ifdef HAVE_STAT
 510         struct stat buf;
 511         if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 512 #endif
 513             AppendCaptureDeviceList(oss_device);
 514     }
 515 }