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 = 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                     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 = 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             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(device->FmtType)
 202     {
 203         case DevFmtByte:
 204             ossFormat = AFMT_S8;
 205             break;
 206         case DevFmtUByte:
 207             ossFormat = AFMT_U8;
 208             break;
 209         case DevFmtUShort:
 210         case DevFmtFloat:
 211             device->FmtType = DevFmtShort;
 212             /* fall-through */
 213         case DevFmtShort:
 214             ossFormat = AFMT_S16_NE;
 215             break;
 216     }
 217
 218     periods = device->NumUpdates;
 219     numChannels = ChannelsFromDevFmt(device->FmtChans);
 220     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 221
 222     ossSpeed = device->Frequency;
 223     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 224
 225     /* according to the OSS spec, 16 bytes are the minimum */
 226     if (log2FragmentSize < 4)
 227         log2FragmentSize = 4;
 228     /* Subtract one period since the temp mixing buffer counts as one. Still
 229      * need at least two on the card, though. */
 230     if(periods > 2) periods--;
 231     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 232
 233 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 234     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 235      * that's reported back via GETOSPACE */
 236     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 237     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 238           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 239           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 240           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 241     {
 242         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 243         return ALC_FALSE;
 244     }
 245 #undef ok
 246
 247     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 248     {
 249         AL_PRINT("Could not set %d channels, got %d instead\n", ChannelsFromDevFmt(device->FmtChans), numChannels);
 250         return ALC_FALSE;
 251     }
 252
 253     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 254          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 255          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 256     {
 257         AL_PRINT("Could not set %#x format type, got OSS format %#x\n", device->FmtType, ossFormat);
 258         return ALC_FALSE;
 259     }
 260
 261     device->Frequency = ossSpeed;
 262     device->UpdateSize = info.fragsize / frameSize;
 263     device->NumUpdates = info.fragments + 1;
 264
 265     data->data_size = device->UpdateSize * frameSize;
 266     data->mix_data = calloc(1, data->data_size);
 267
 268     SetDefaultChannelOrder(device);
 269
 270     data->thread = StartThread(OSSProc, device);
 271     if(data->thread == NULL)
 272     {
 273         free(data->mix_data);
 274         data->mix_data = NULL;
 275         return ALC_FALSE;
 276     }
 277
 278     return ALC_TRUE;
 279 }
 280
 281 static void oss_stop_playback(ALCdevice *device)
 282 {
 283     oss_data *data = (oss_data*)device->ExtraData;
 284
 285     if(!data->thread)
 286         return;
 287
 288     data->killNow = 1;
 289     StopThread(data->thread);
 290     data->thread = NULL;
 291
 292     data->killNow = 0;
 293     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 294         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 295
 296     free(data->mix_data);
 297     data->mix_data = NULL;
 298 }
 299
 300
 301 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 302 {
 303     int numFragmentsLogSize;
 304     int log2FragmentSize;
 305     unsigned int periods;
 306     audio_buf_info info;
 307     ALuint frameSize;
 308     int numChannels;
 309     char driver[64];
 310     oss_data *data;
 311     int ossFormat;
 312     int ossSpeed;
 313     char *err;
 314     int i;
 315
 316     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 317     driver[sizeof(driver)-1] = 0;
 318     if(!deviceName)
 319         deviceName = oss_device;
 320     else if(strcmp(deviceName, oss_device) != 0)
 321         return ALC_FALSE;
 322
 323     data = (oss_data*)calloc(1, sizeof(oss_data));
 324     data->killNow = 0;
 325
 326     data->fd = open(driver, O_RDONLY);
 327     if(data->fd == -1)
 328     {
 329         free(data);
 330         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 331         return ALC_FALSE;
 332     }
 333
 334     switch(device->FmtType)
 335     {
 336         case DevFmtByte:
 337             ossFormat = AFMT_S8;
 338             break;
 339         case DevFmtUByte:
 340             ossFormat = AFMT_U8;
 341             break;
 342         case DevFmtShort:
 343             ossFormat = AFMT_S16_NE;
 344             break;
 345         case DevFmtUShort:
 346         case DevFmtFloat:
 347             free(data);
 348             AL_PRINT("Format type %#x capture not supported on OSS\n", device->FmtType);
 349             return ALC_FALSE;
 350     }
 351
 352     periods = 4;
 353     numChannels = ChannelsFromDevFmt(device->FmtChans);
 354     frameSize = numChannels * BytesFromDevFmt(device->FmtType);
 355     ossSpeed = device->Frequency;
 356     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 357                              frameSize / periods);
 358
 359     /* according to the OSS spec, 16 bytes are the minimum */
 360     if (log2FragmentSize < 4)
 361         log2FragmentSize = 4;
 362     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 363
 364 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 365     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 366           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 367           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 368           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 369           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 370     {
 371         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 372         close(data->fd);
 373         free(data);
 374         return ALC_FALSE;
 375     }
 376 #undef ok
 377
 378     if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
 379     {
 380         AL_PRINT("Could not set %d channels, got %d instead\n", ChannelsFromDevFmt(device->FmtChans), numChannels);
 381         close(data->fd);
 382         free(data);
 383         return ALC_FALSE;
 384     }
 385
 386     if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
 387          (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
 388          (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
 389     {
 390         AL_PRINT("Could not set %#x format type, got OSS format %#x\n", device->FmtType, ossFormat);
 391         close(data->fd);
 392         free(data);
 393         return ALC_FALSE;
 394     }
 395
 396     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 397     if(!data->ring)
 398     {
 399         AL_PRINT("ring buffer create failed\n");
 400         close(data->fd);
 401         free(data);
 402         return ALC_FALSE;
 403     }
 404
 405     data->data_size = info.fragsize;
 406     data->mix_data = calloc(1, data->data_size);
 407
 408     device->ExtraData = data;
 409     data->thread = StartThread(OSSCaptureProc, device);
 410     if(data->thread == NULL)
 411     {
 412         device->ExtraData = NULL;
 413         free(data->mix_data);
 414         free(data);
 415         return ALC_FALSE;
 416     }
 417
 418     device->szDeviceName = strdup(deviceName);
 419     return ALC_TRUE;
 420 }
 421
 422 static void oss_close_capture(ALCdevice *device)
 423 {
 424     oss_data *data = (oss_data*)device->ExtraData;
 425     data->killNow = 1;
 426     StopThread(data->thread);
 427
 428     close(data->fd);
 429
 430     DestroyRingBuffer(data->ring);
 431
 432     free(data->mix_data);
 433     free(data);
 434     device->ExtraData = NULL;
 435 }
 436
 437 static void oss_start_capture(ALCdevice *pDevice)
 438 {
 439     oss_data *data = (oss_data*)pDevice->ExtraData;
 440     data->doCapture = 1;
 441 }
 442
 443 static void oss_stop_capture(ALCdevice *pDevice)
 444 {
 445     oss_data *data = (oss_data*)pDevice->ExtraData;
 446     data->doCapture = 0;
 447 }
 448
 449 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 450 {
 451     oss_data *data = (oss_data*)pDevice->ExtraData;
 452     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 453         ReadRingBuffer(data->ring, pBuffer, lSamples);
 454     else
 455         alcSetError(pDevice, ALC_INVALID_VALUE);
 456 }
 457
 458 static ALCuint oss_available_samples(ALCdevice *pDevice)
 459 {
 460     oss_data *data = (oss_data*)pDevice->ExtraData;
 461     return RingBufferSize(data->ring);
 462 }
 463
 464
 465 BackendFuncs oss_funcs = {
 466     oss_open_playback,
 467     oss_close_playback,
 468     oss_reset_playback,
 469     oss_stop_playback,
 470     oss_open_capture,
 471     oss_close_capture,
 472     oss_start_capture,
 473     oss_stop_capture,
 474     oss_capture_samples,
 475     oss_available_samples
 476 };
 477
 478 void alc_oss_init(BackendFuncs *func_list)
 479 {
 480     *func_list = oss_funcs;
 481 }
 482
 483 void alc_oss_deinit(void)
 484 {
 485 }
 486
 487 void alc_oss_probe(int type)
 488 {
 489     if(type == DEVICE_PROBE)
 490     {
 491 #ifdef HAVE_STAT
 492         struct stat buf;
 493         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 494 #endif
 495             AppendDeviceList(oss_device);
 496     }
 497     else if(type == ALL_DEVICE_PROBE)
 498     {
 499 #ifdef HAVE_STAT
 500         struct stat buf;
 501         if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
 502 #endif
 503             AppendAllDeviceList(oss_device);
 504     }
 505     else if(type == CAPTURE_DEVICE_PROBE)
 506     {
 507 #ifdef HAVE_STAT
 508         struct stat buf;
 509         if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
 510 #endif
 511             AppendCaptureDeviceList(oss_device);
 512     }
 513 }