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     EnableRTPrio();
  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                     len = 0;
 106                 }
 107                 else
 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     EnableRTPrio();
 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         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 173         return ALC_FALSE;
 174     }
 175
 176     device->szDeviceName = strdup(deviceName);
 177     device->ExtraData = data;
 178     return ALC_TRUE;
 179 }
 180
 181 static void oss_close_playback(ALCdevice *device)
 182 {
 183     oss_data *data = (oss_data*)device->ExtraData;
 184
 185     close(data->fd);
 186     free(data);
 187     device->ExtraData = NULL;
 188 }
 189
 190 static ALCboolean oss_reset_playback(ALCdevice *device)
 191 {
 192     oss_data *data = (oss_data*)device->ExtraData;
 193     int numFragmentsLogSize;
 194     int log2FragmentSize;
 195     unsigned int periods;
 196     audio_buf_info info;
 197     ALuint frameSize;
 198     int numChannels;
 199     int ossFormat;
 200     int ossSpeed;
 201     char *err;
 202     int i;
 203
 204     switch(aluBytesFromFormat(device->Format))
 205     {
 206         case 1:
 207             ossFormat = AFMT_U8;
 208             break;
 209         case 4:
 210             switch(aluChannelsFromFormat(device->Format))
 211             {
 212                 case 1: device->Format = AL_FORMAT_MONO16; break;
 213                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 214                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 215                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 216                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 217                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 218             }
 219             /* fall-through */
 220         case 2:
 221             ossFormat = AFMT_S16_NE;
 222             break;
 223         default:
 224             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 225             return ALC_FALSE;
 226     }
 227
 228     periods = device->NumUpdates;
 229     numChannels = aluChannelsFromFormat(device->Format);
 230     frameSize = numChannels * aluBytesFromFormat(device->Format);
 231
 232     ossSpeed = device->Frequency;
 233     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 234
 235     /* according to the OSS spec, 16 bytes are the minimum */
 236     if (log2FragmentSize < 4)
 237         log2FragmentSize = 4;
 238     /* Subtract one period since the temp mixing buffer counts as one. Still
 239      * need at least two on the card, though. */
 240     if(periods > 2) periods--;
 241     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 242
 243 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 244     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 245      * that's reported back via GETOSPACE */
 246     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 247     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 248           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 249           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 250           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 251     {
 252         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 253         return ALC_FALSE;
 254     }
 255 #undef ok
 256
 257     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 258     {
 259         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 260         return ALC_FALSE;
 261     }
 262
 263     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 264          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 265     {
 266         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 267         return ALC_FALSE;
 268     }
 269
 270     device->Frequency = ossSpeed;
 271     device->UpdateSize = info.fragsize / frameSize;
 272     device->NumUpdates = info.fragments + 1;
 273
 274     data->data_size = device->UpdateSize * frameSize;
 275     data->mix_data = calloc(1, data->data_size);
 276
 277     data->thread = StartThread(OSSProc, device);
 278     if(data->thread == NULL)
 279     {
 280         free(data->mix_data);
 281         data->mix_data = NULL;
 282         return ALC_FALSE;
 283     }
 284
 285     return ALC_TRUE;
 286 }
 287
 288 static void oss_stop_playback(ALCdevice *device)
 289 {
 290     oss_data *data = (oss_data*)device->ExtraData;
 291
 292     if(!data->thread)
 293         return;
 294
 295     data->killNow = 1;
 296     StopThread(data->thread);
 297     data->thread = NULL;
 298
 299     data->killNow = 0;
 300     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 301         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 302
 303     free(data->mix_data);
 304     data->mix_data = NULL;
 305 }
 306
 307
 308 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 309 {
 310     int numFragmentsLogSize;
 311     int log2FragmentSize;
 312     unsigned int periods;
 313     audio_buf_info info;
 314     ALuint frameSize;
 315     int numChannels;
 316     char driver[64];
 317     oss_data *data;
 318     int ossFormat;
 319     int ossSpeed;
 320     char *err;
 321     int i;
 322
 323     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 324     driver[sizeof(driver)-1] = 0;
 325     if(!deviceName)
 326         deviceName = oss_device_capture;
 327     else if(strcmp(deviceName, oss_device_capture) != 0)
 328         return ALC_FALSE;
 329
 330     data = (oss_data*)calloc(1, sizeof(oss_data));
 331     data->killNow = 0;
 332
 333     data->fd = open(driver, O_RDONLY);
 334     if(data->fd == -1)
 335     {
 336         free(data);
 337         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 338         return ALC_FALSE;
 339     }
 340
 341     switch(aluBytesFromFormat(device->Format))
 342     {
 343         case 1:
 344             ossFormat = AFMT_U8;
 345             break;
 346         case 2:
 347             ossFormat = AFMT_S16_NE;
 348             break;
 349         default:
 350             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 351             close(data->fd);
 352             free(data);
 353             return ALC_FALSE;
 354     }
 355
 356     periods = 4;
 357     numChannels = aluChannelsFromFormat(device->Format);
 358     frameSize = numChannels * aluBytesFromFormat(device->Format);
 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 ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 369     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 370           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 371           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 372           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 373           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 374     {
 375         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 376         close(data->fd);
 377         free(data);
 378         return ALC_FALSE;
 379     }
 380 #undef ok
 381
 382     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 383     {
 384         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 385         close(data->fd);
 386         free(data);
 387         return ALC_FALSE;
 388     }
 389
 390     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 391          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 392     {
 393         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 394         close(data->fd);
 395         free(data);
 396         return ALC_FALSE;
 397     }
 398
 399     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 400     if(!data->ring)
 401     {
 402         AL_PRINT("ring buffer create failed\n");
 403         close(data->fd);
 404         free(data);
 405         return ALC_FALSE;
 406     }
 407
 408     data->data_size = info.fragsize;
 409     data->mix_data = calloc(1, data->data_size);
 410
 411     device->ExtraData = data;
 412     data->thread = StartThread(OSSCaptureProc, device);
 413     if(data->thread == NULL)
 414     {
 415         device->ExtraData = NULL;
 416         free(data->mix_data);
 417         free(data);
 418         return ALC_FALSE;
 419     }
 420
 421     device->szDeviceName = strdup(deviceName);
 422     return ALC_TRUE;
 423 }
 424
 425 static void oss_close_capture(ALCdevice *device)
 426 {
 427     oss_data *data = (oss_data*)device->ExtraData;
 428     data->killNow = 1;
 429     StopThread(data->thread);
 430
 431     close(data->fd);
 432
 433     DestroyRingBuffer(data->ring);
 434
 435     free(data->mix_data);
 436     free(data);
 437     device->ExtraData = NULL;
 438 }
 439
 440 static void oss_start_capture(ALCdevice *pDevice)
 441 {
 442     oss_data *data = (oss_data*)pDevice->ExtraData;
 443     data->doCapture = 1;
 444 }
 445
 446 static void oss_stop_capture(ALCdevice *pDevice)
 447 {
 448     oss_data *data = (oss_data*)pDevice->ExtraData;
 449     data->doCapture = 0;
 450 }
 451
 452 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 453 {
 454     oss_data *data = (oss_data*)pDevice->ExtraData;
 455     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 456         ReadRingBuffer(data->ring, pBuffer, lSamples);
 457     else
 458         alcSetError(ALC_INVALID_VALUE);
 459 }
 460
 461 static ALCuint oss_available_samples(ALCdevice *pDevice)
 462 {
 463     oss_data *data = (oss_data*)pDevice->ExtraData;
 464     return RingBufferSize(data->ring);
 465 }
 466
 467
 468 BackendFuncs oss_funcs = {
 469     oss_open_playback,
 470     oss_close_playback,
 471     oss_reset_playback,
 472     oss_stop_playback,
 473     oss_open_capture,
 474     oss_close_capture,
 475     oss_start_capture,
 476     oss_stop_capture,
 477     oss_capture_samples,
 478     oss_available_samples
 479 };
 480
 481 void alc_oss_init(BackendFuncs *func_list)
 482 {
 483     *func_list = oss_funcs;
 484 }
 485
 486 void alc_oss_deinit(void)
 487 {
 488 }
 489
 490 void alc_oss_probe(int type)
 491 {
 492     if(type == DEVICE_PROBE)
 493         AppendDeviceList(oss_device);
 494     else if(type == ALL_DEVICE_PROBE)
 495         AppendAllDeviceList(oss_device);
 496     else if(type == CAPTURE_DEVICE_PROBE)
 497         AppendCaptureDeviceList(oss_device_capture);
 498 }