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 <sys/ioctl.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <memory.h>
  28 #include <unistd.h>
  29 #include <errno.h>
  30 #include <math.h>
  31 #include "alMain.h"
  32 #include "AL/al.h"
  33 #include "AL/alc.h"
  34
  35 #include <sys/soundcard.h>
  36
  37 /*
  38  * The OSS documentation talks about SOUND_MIXER_READ, but the header
  39  * only contains MIXER_READ. Play safe. Same for WRITE.
  40  */
  41 #ifndef SOUND_MIXER_READ
  42 #define SOUND_MIXER_READ MIXER_READ
  43 #endif
  44 #ifndef SOUND_MIXER_WRITE
  45 #define SOUND_MIXER_WRITE MIXER_WRITE
  46 #endif
  47
  48 static char *oss_device;
  49 static char *oss_device_capture;
  50
  51 typedef struct {
  52     int fd;
  53     int killNow;
  54     ALvoid *thread;
  55
  56     ALubyte *mix_data;
  57     int data_size;
  58     int silence;
  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     int remaining;
  82     int wrote;
  83
  84     while(!data->killNow)
  85     {
  86         SuspendContext(NULL);
  87         aluMixData(pDevice->Context,data->mix_data,data->data_size,pDevice->Format);
  88         ProcessContext(NULL);
  89
  90         remaining = data->data_size;
  91         while(remaining > 0)
  92         {
  93             wrote = write(data->fd, data->mix_data+data->data_size-remaining, remaining);
  94             if(wrote < 0)
  95             {
  96                 AL_PRINT("write failed: %s\n", strerror(errno));
  97                 break;
  98             }
  99             if(wrote == 0)
 100             {
 101                 usleep(1000);
 102                 continue;
 103             }
 104             remaining -= wrote;
 105         }
 106     }
 107
 108     return 0;
 109 }
 110
 111 static ALuint OSSCaptureProc(ALvoid *ptr)
 112 {
 113     ALCdevice *pDevice = (ALCdevice*)ptr;
 114     oss_data *data = (oss_data*)pDevice->ExtraData;
 115     int frameSize;
 116     int amt;
 117
 118     frameSize  = aluBytesFromFormat(pDevice->Format);
 119     frameSize *= aluChannelsFromFormat(pDevice->Format);
 120
 121     while(!data->killNow)
 122     {
 123         amt = read(data->fd, data->mix_data, data->data_size);
 124         if(amt < 0)
 125         {
 126             AL_PRINT("read failed: %s\n", strerror(errno));
 127             break;
 128         }
 129         if(amt == 0)
 130         {
 131             usleep(1000);
 132             continue;
 133         }
 134         if(data->doCapture)
 135             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 136     }
 137
 138     return 0;
 139 }
 140
 141 static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 142 {
 143     int numFragmentsLogSize;
 144     int log2FragmentSize;
 145     unsigned int periods;
 146     audio_buf_info info;
 147     char driver[64];
 148     int numChannels;
 149     oss_data *data;
 150     int ossFormat;
 151     int ossSpeed;
 152     char *err;
 153     int i;
 154
 155     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 156     driver[sizeof(driver)-1] = 0;
 157     if(deviceName)
 158     {
 159         if(strcmp(deviceName, oss_device))
 160             return ALC_FALSE;
 161         device->szDeviceName = oss_device;
 162     }
 163     else
 164         device->szDeviceName = oss_device;
 165
 166     data = (oss_data*)calloc(1, sizeof(oss_data));
 167     data->killNow = 0;
 168
 169     data->fd = open(driver, O_WRONLY);
 170     if(data->fd == -1)
 171     {
 172         free(data);
 173         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 174         return ALC_FALSE;
 175     }
 176
 177     switch(aluBytesFromFormat(device->Format))
 178     {
 179         case 1:
 180             data->silence = 0x80;
 181             ossFormat = AFMT_U8;
 182             break;
 183         case 2:
 184             data->silence = 0;
 185             ossFormat = AFMT_S16_NE;
 186             break;
 187         default:
 188             ossFormat = -1;
 189             AL_PRINT("Unknown format?! %x\n", device->Format);
 190     }
 191
 192     periods = GetConfigValueInt("oss", "periods", 4);
 193     if((int)periods < 0)
 194         periods = 4;
 195     numChannels = device->Channels;
 196     ossSpeed = device->Frequency;
 197     log2FragmentSize = log2i(device->UpdateFreq * device->FrameSize / periods);
 198
 199     /* according to the OSS spec, 16 bytes are the minimum */
 200     if (log2FragmentSize < 4)
 201         log2FragmentSize = 4;
 202     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 203
 204 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 205     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 206           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 207           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 208           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 209           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 210     {
 211         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 212         close(data->fd);
 213         free(data);
 214         return ALC_FALSE;
 215     }
 216 #undef ok
 217
 218     device->Channels = numChannels;
 219     device->Frequency = ossSpeed;
 220     device->Format = 0;
 221     if(ossFormat == AFMT_U8)
 222     {
 223         if(device->Channels == 1)
 224         {
 225             device->Format = AL_FORMAT_MONO8;
 226             device->FrameSize = 1;
 227         }
 228         else if(device->Channels == 2)
 229         {
 230             device->Format = AL_FORMAT_STEREO8;
 231             device->FrameSize = 2;
 232         }
 233         else if(device->Channels == 4)
 234         {
 235             device->Format = AL_FORMAT_QUAD8;
 236             device->FrameSize = 4;
 237         }
 238     }
 239     else if(ossFormat == AFMT_S16_NE)
 240     {
 241         if(device->Channels == 1)
 242         {
 243             device->Format = AL_FORMAT_MONO16;
 244             device->FrameSize = 2;
 245         }
 246         else if(device->Channels == 2)
 247         {
 248             device->Format = AL_FORMAT_STEREO16;
 249             device->FrameSize = 4;
 250         }
 251         else if(device->Channels == 4)
 252         {
 253             device->Format = AL_FORMAT_QUAD16;
 254             device->FrameSize = 8;
 255         }
 256     }
 257
 258     if(!device->Format)
 259     {
 260         AL_PRINT("returned unknown format: %#x %d!\n", ossFormat, numChannels);
 261         close(data->fd);
 262         free(data);
 263         return ALC_FALSE;
 264     }
 265
 266     device->UpdateFreq = info.fragsize / device->FrameSize;
 267
 268     data->data_size = device->UpdateFreq * device->FrameSize;
 269     data->mix_data = calloc(1, data->data_size);
 270
 271     device->MaxNoOfSources = 256;
 272
 273     device->ExtraData = data;
 274     data->thread = StartThread(OSSProc, device);
 275     if(data->thread == NULL)
 276     {
 277         device->ExtraData = NULL;
 278         free(data->mix_data);
 279         free(data);
 280         return ALC_FALSE;
 281     }
 282
 283     return ALC_TRUE;
 284 }
 285
 286 static void oss_close_playback(ALCdevice *device)
 287 {
 288     oss_data *data = (oss_data*)device->ExtraData;
 289     data->killNow = 1;
 290     StopThread(data->thread);
 291
 292     close(data->fd);
 293
 294     free(data->mix_data);
 295     free(data);
 296     device->ExtraData = NULL;
 297 }
 298
 299
 300 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 301 {
 302     int numFragmentsLogSize;
 303     int log2FragmentSize;
 304     unsigned int periods;
 305     audio_buf_info info;
 306     int numChannels;
 307     char driver[64];
 308     oss_data *data;
 309     int ossFormat;
 310     int ossSpeed;
 311     char *err;
 312     int i;
 313
 314     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 315     driver[sizeof(driver)-1] = 0;
 316     if(deviceName)
 317     {
 318         if(strcmp(deviceName, oss_device_capture))
 319             return ALC_FALSE;
 320         device->szDeviceName = oss_device_capture;
 321     }
 322     else
 323         device->szDeviceName = oss_device_capture;
 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(format))
 337     {
 338         case 1:
 339             data->silence = 0x80;
 340             ossFormat = AFMT_U8;
 341             break;
 342         case 2:
 343             data->silence = 0;
 344             ossFormat = AFMT_S16_NE;
 345             break;
 346         default:
 347             ossFormat = -1;
 348             AL_PRINT("Unknown format?! %x\n", device->Format);
 349     }
 350
 351     periods = 4;
 352     numChannels = device->Channels;
 353     ossSpeed = frequency;
 354     log2FragmentSize = log2i(device->UpdateFreq * device->FrameSize / periods);
 355
 356     /* according to the OSS spec, 16 bytes are the minimum */
 357     if (log2FragmentSize < 4)
 358         log2FragmentSize = 4;
 359     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 360
 361 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 362     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 363           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 364           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 365           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 366           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 367     {
 368         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 369         close(data->fd);
 370         free(data);
 371         return ALC_FALSE;
 372     }
 373 #undef ok
 374
 375     device->Channels = numChannels;
 376     device->Frequency = ossSpeed;
 377     device->Format = 0;
 378     if(ossFormat == AFMT_U8)
 379     {
 380         if(device->Channels == 1)
 381         {
 382             device->Format = AL_FORMAT_MONO8;
 383             device->FrameSize = 1;
 384         }
 385         else if(device->Channels == 2)
 386         {
 387             device->Format = AL_FORMAT_STEREO8;
 388             device->FrameSize = 2;
 389         }
 390         else if(device->Channels == 4)
 391         {
 392             device->Format = AL_FORMAT_QUAD8;
 393             device->FrameSize = 4;
 394         }
 395     }
 396     else if(ossFormat == AFMT_S16_NE)
 397     {
 398         if(device->Channels == 1)
 399         {
 400             device->Format = AL_FORMAT_MONO16;
 401             device->FrameSize = 2;
 402         }
 403         else if(device->Channels == 2)
 404         {
 405             device->Format = AL_FORMAT_STEREO16;
 406             device->FrameSize = 4;
 407         }
 408         else if(device->Channels == 4)
 409         {
 410             device->Format = AL_FORMAT_QUAD16;
 411             device->FrameSize = 8;
 412         }
 413     }
 414
 415     if(!device->Format)
 416     {
 417         AL_PRINT("returned unknown format: %#x %d!\n", ossFormat, numChannels);
 418         close(data->fd);
 419         free(data);
 420         return ALC_FALSE;
 421     }
 422
 423     data->ring = CreateRingBuffer(device->FrameSize, SampleSize);
 424     if(!data->ring)
 425     {
 426         AL_PRINT("ring buffer create failed\n");
 427         close(data->fd);
 428         free(data);
 429         return ALC_FALSE;
 430     }
 431
 432     device->UpdateFreq = info.fragsize / device->FrameSize;
 433
 434     data->data_size = device->UpdateFreq * device->FrameSize;
 435     data->mix_data = calloc(1, data->data_size);
 436
 437     device->ExtraData = data;
 438     data->thread = StartThread(OSSCaptureProc, device);
 439     if(data->thread == NULL)
 440     {
 441         device->ExtraData = NULL;
 442         free(data->mix_data);
 443         free(data);
 444         return ALC_FALSE;
 445     }
 446
 447     return ALC_TRUE;
 448 }
 449
 450 static void oss_close_capture(ALCdevice *device)
 451 {
 452     oss_data *data = (oss_data*)device->ExtraData;
 453     data->killNow = 1;
 454     StopThread(data->thread);
 455
 456     close(data->fd);
 457
 458     DestroyRingBuffer(data->ring);
 459
 460     free(data->mix_data);
 461     free(data);
 462     device->ExtraData = NULL;
 463 }
 464
 465 static void oss_start_capture(ALCdevice *pDevice)
 466 {
 467     oss_data *data = (oss_data*)pDevice->ExtraData;
 468     data->doCapture = 1;
 469 }
 470
 471 static void oss_stop_capture(ALCdevice *pDevice)
 472 {
 473     oss_data *data = (oss_data*)pDevice->ExtraData;
 474     data->doCapture = 0;
 475 }
 476
 477 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 478 {
 479     oss_data *data = (oss_data*)pDevice->ExtraData;
 480     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 481         ReadRingBuffer(data->ring, pBuffer, lSamples);
 482     else
 483         SetALCError(ALC_INVALID_VALUE);
 484 }
 485
 486 static ALCuint oss_available_samples(ALCdevice *pDevice)
 487 {
 488     oss_data *data = (oss_data*)pDevice->ExtraData;
 489     return RingBufferSize(data->ring);
 490 }
 491
 492
 493 BackendFuncs oss_funcs = {
 494     oss_open_playback,
 495     oss_close_playback,
 496     oss_open_capture,
 497     oss_close_capture,
 498     oss_start_capture,
 499     oss_stop_capture,
 500     oss_capture_samples,
 501     oss_available_samples
 502 };
 503
 504 void alc_oss_init(BackendFuncs *func_list)
 505 {
 506     *func_list = oss_funcs;
 507
 508     oss_device = AppendDeviceList("OSS Software");
 509     AppendAllDeviceList(oss_device);
 510
 511     oss_device_capture = AppendCaptureDeviceList("OSS Capture");
 512 }