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     frameSize = aluChannelsFromFormat(pDevice->Format) *
  86                 aluBytesFromFormat(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                     len = 0;
 104                 }
 105                 else
 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     frameSize  = aluBytesFromFormat(pDevice->Format);
 126     frameSize *= aluChannelsFromFormat(pDevice->Format);
 127
 128     while(!data->killNow)
 129     {
 130         amt = read(data->fd, data->mix_data, data->data_size);
 131         if(amt < 0)
 132         {
 133             AL_PRINT("read failed: %s\n", strerror(errno));
 134             aluHandleDisconnect(pDevice);
 135             break;
 136         }
 137         if(amt == 0)
 138         {
 139             Sleep(1);
 140             continue;
 141         }
 142         if(data->doCapture)
 143             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 144     }
 145
 146     return 0;
 147 }
 148
 149 static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 150 {
 151     char driver[64];
 152     oss_data *data;
 153
 154     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 155     driver[sizeof(driver)-1] = 0;
 156     if(!deviceName)
 157         deviceName = oss_device;
 158     else if(strcmp(deviceName, oss_device) != 0)
 159         return ALC_FALSE;
 160
 161     data = (oss_data*)calloc(1, sizeof(oss_data));
 162     data->killNow = 0;
 163
 164     data->fd = open(driver, O_WRONLY);
 165     if(data->fd == -1)
 166     {
 167         free(data);
 168         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 169         return ALC_FALSE;
 170     }
 171
 172     device->szDeviceName = strdup(deviceName);
 173     device->ExtraData = data;
 174     return ALC_TRUE;
 175 }
 176
 177 static void oss_close_playback(ALCdevice *device)
 178 {
 179     oss_data *data = (oss_data*)device->ExtraData;
 180
 181     close(data->fd);
 182     free(data);
 183     device->ExtraData = NULL;
 184 }
 185
 186 static ALCboolean oss_reset_playback(ALCdevice *device)
 187 {
 188     oss_data *data = (oss_data*)device->ExtraData;
 189     int numFragmentsLogSize;
 190     int log2FragmentSize;
 191     unsigned int periods;
 192     audio_buf_info info;
 193     ALuint frameSize;
 194     int numChannels;
 195     int ossFormat;
 196     int ossSpeed;
 197     char *err;
 198     int i;
 199
 200     switch(aluBytesFromFormat(device->Format))
 201     {
 202         case 1:
 203             ossFormat = AFMT_U8;
 204             break;
 205         case 4:
 206             switch(aluChannelsFromFormat(device->Format))
 207             {
 208                 case 1: device->Format = AL_FORMAT_MONO16; break;
 209                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 210                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 211                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 212                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 213                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 214             }
 215             /* fall-through */
 216         case 2:
 217             ossFormat = AFMT_S16_NE;
 218             break;
 219         default:
 220             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 221             return ALC_FALSE;
 222     }
 223
 224     periods = device->NumUpdates;
 225     numChannels = aluChannelsFromFormat(device->Format);
 226     frameSize = numChannels * aluBytesFromFormat(device->Format);
 227
 228     ossSpeed = device->Frequency;
 229     log2FragmentSize = log2i(device->UpdateSize * frameSize);
 230
 231     /* according to the OSS spec, 16 bytes are the minimum */
 232     if (log2FragmentSize < 4)
 233         log2FragmentSize = 4;
 234     /* Subtract one period since the temp mixing buffer counts as one. Still
 235      * need at least two on the card, though. */
 236     if(periods > 2) periods--;
 237     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 238
 239 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 240     /* Don't fail if SETFRAGMENT fails. We can handle just about anything
 241      * that's reported back via GETOSPACE */
 242     ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
 243     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 244           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 245           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 246           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 247     {
 248         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 249         return ALC_FALSE;
 250     }
 251 #undef ok
 252
 253     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 254     {
 255         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 256         return ALC_FALSE;
 257     }
 258
 259     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 260          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 261     {
 262         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 263         return ALC_FALSE;
 264     }
 265
 266     device->Frequency = ossSpeed;
 267     device->UpdateSize = info.fragsize / frameSize;
 268     device->NumUpdates = info.fragments + 1;
 269
 270     data->data_size = device->UpdateSize * frameSize;
 271     data->mix_data = calloc(1, data->data_size);
 272
 273     data->thread = StartThread(OSSProc, device);
 274     if(data->thread == NULL)
 275     {
 276         free(data->mix_data);
 277         data->mix_data = NULL;
 278         return ALC_FALSE;
 279     }
 280
 281     return ALC_TRUE;
 282 }
 283
 284 static void oss_stop_playback(ALCdevice *device)
 285 {
 286     oss_data *data = (oss_data*)device->ExtraData;
 287
 288     if(!data->thread)
 289         return;
 290
 291     data->killNow = 1;
 292     StopThread(data->thread);
 293     data->thread = NULL;
 294
 295     if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
 296         AL_PRINT("Error resetting device: %s\n", strerror(errno));
 297
 298     free(data->mix_data);
 299     data->mix_data = NULL;
 300 }
 301
 302
 303 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 304 {
 305     int numFragmentsLogSize;
 306     int log2FragmentSize;
 307     unsigned int periods;
 308     audio_buf_info info;
 309     ALuint frameSize;
 310     int numChannels;
 311     char driver[64];
 312     oss_data *data;
 313     int ossFormat;
 314     int ossSpeed;
 315     char *err;
 316     int i;
 317
 318     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 319     driver[sizeof(driver)-1] = 0;
 320     if(!deviceName)
 321         deviceName = oss_device_capture;
 322     else if(strcmp(deviceName, oss_device_capture) != 0)
 323         return ALC_FALSE;
 324
 325     data = (oss_data*)calloc(1, sizeof(oss_data));
 326     data->killNow = 0;
 327
 328     data->fd = open(driver, O_RDONLY);
 329     if(data->fd == -1)
 330     {
 331         free(data);
 332         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 333         return ALC_FALSE;
 334     }
 335
 336     switch(aluBytesFromFormat(device->Format))
 337     {
 338         case 1:
 339             ossFormat = AFMT_U8;
 340             break;
 341         case 2:
 342             ossFormat = AFMT_S16_NE;
 343             break;
 344         default:
 345             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 346             close(data->fd);
 347             free(data);
 348             return ALC_FALSE;
 349     }
 350
 351     periods = 4;
 352     numChannels = aluChannelsFromFormat(device->Format);
 353     frameSize = numChannels * aluBytesFromFormat(device->Format);
 354     ossSpeed = device->Frequency;
 355     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 356                              frameSize / periods);
 357
 358     /* according to the OSS spec, 16 bytes are the minimum */
 359     if (log2FragmentSize < 4)
 360         log2FragmentSize = 4;
 361     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 362
 363 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 364     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 365           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 366           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 367           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 368           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 369     {
 370         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 371         close(data->fd);
 372         free(data);
 373         return ALC_FALSE;
 374     }
 375 #undef ok
 376
 377     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 378     {
 379         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 380         close(data->fd);
 381         free(data);
 382         return ALC_FALSE;
 383     }
 384
 385     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 386          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 387     {
 388         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 389         close(data->fd);
 390         free(data);
 391         return ALC_FALSE;
 392     }
 393
 394     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 395     if(!data->ring)
 396     {
 397         AL_PRINT("ring buffer create failed\n");
 398         close(data->fd);
 399         free(data);
 400         return ALC_FALSE;
 401     }
 402
 403     data->data_size = info.fragsize;
 404     data->mix_data = calloc(1, data->data_size);
 405
 406     device->ExtraData = data;
 407     data->thread = StartThread(OSSCaptureProc, device);
 408     if(data->thread == NULL)
 409     {
 410         device->ExtraData = NULL;
 411         free(data->mix_data);
 412         free(data);
 413         return ALC_FALSE;
 414     }
 415
 416     device->szDeviceName = strdup(deviceName);
 417     return ALC_TRUE;
 418 }
 419
 420 static void oss_close_capture(ALCdevice *device)
 421 {
 422     oss_data *data = (oss_data*)device->ExtraData;
 423     data->killNow = 1;
 424     StopThread(data->thread);
 425
 426     close(data->fd);
 427
 428     DestroyRingBuffer(data->ring);
 429
 430     free(data->mix_data);
 431     free(data);
 432     device->ExtraData = NULL;
 433 }
 434
 435 static void oss_start_capture(ALCdevice *pDevice)
 436 {
 437     oss_data *data = (oss_data*)pDevice->ExtraData;
 438     data->doCapture = 1;
 439 }
 440
 441 static void oss_stop_capture(ALCdevice *pDevice)
 442 {
 443     oss_data *data = (oss_data*)pDevice->ExtraData;
 444     data->doCapture = 0;
 445 }
 446
 447 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 448 {
 449     oss_data *data = (oss_data*)pDevice->ExtraData;
 450     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 451         ReadRingBuffer(data->ring, pBuffer, lSamples);
 452     else
 453         alcSetError(ALC_INVALID_VALUE);
 454 }
 455
 456 static ALCuint oss_available_samples(ALCdevice *pDevice)
 457 {
 458     oss_data *data = (oss_data*)pDevice->ExtraData;
 459     return RingBufferSize(data->ring);
 460 }
 461
 462
 463 BackendFuncs oss_funcs = {
 464     oss_open_playback,
 465     oss_close_playback,
 466     oss_reset_playback,
 467     oss_stop_playback,
 468     oss_open_capture,
 469     oss_close_capture,
 470     oss_start_capture,
 471     oss_stop_capture,
 472     oss_capture_samples,
 473     oss_available_samples
 474 };
 475
 476 void alc_oss_init(BackendFuncs *func_list)
 477 {
 478     *func_list = oss_funcs;
 479 }
 480
 481 void alc_oss_deinit(void)
 482 {
 483 }
 484
 485 void alc_oss_probe(int type)
 486 {
 487     if(type == DEVICE_PROBE)
 488         AppendDeviceList(oss_device);
 489     else if(type == ALL_DEVICE_PROBE)
 490         AppendAllDeviceList(oss_device);
 491     else if(type == CAPTURE_DEVICE_PROBE)
 492         AppendCaptureDeviceList(oss_device_capture);
 493 }