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     int 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)
 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     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 241           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 242           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 243           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 244           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 245     {
 246         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 247         return ALC_FALSE;
 248     }
 249 #undef ok
 250
 251     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 252     {
 253         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 254         return ALC_FALSE;
 255     }
 256
 257     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 258          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 259     {
 260         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 261         return ALC_FALSE;
 262     }
 263
 264     device->Frequency = ossSpeed;
 265     device->UpdateSize = info.fragsize / frameSize;
 266     device->NumUpdates = info.fragments + 1;
 267
 268     data->data_size = device->UpdateSize * frameSize;
 269     data->mix_data = calloc(1, data->data_size);
 270
 271     data->thread = StartThread(OSSProc, device);
 272     if(data->thread == NULL)
 273     {
 274         free(data->mix_data);
 275         data->mix_data = NULL;
 276         return ALC_FALSE;
 277     }
 278
 279     return ALC_TRUE;
 280 }
 281
 282 static void oss_stop_playback(ALCdevice *device)
 283 {
 284     oss_data *data = (oss_data*)device->ExtraData;
 285
 286     if(!data->thread)
 287         return;
 288
 289     data->killNow = 1;
 290     StopThread(data->thread);
 291     data->thread = NULL;
 292
 293     free(data->mix_data);
 294     data->mix_data = NULL;
 295 }
 296
 297
 298 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
 299 {
 300     int numFragmentsLogSize;
 301     int log2FragmentSize;
 302     unsigned int periods;
 303     audio_buf_info info;
 304     ALuint frameSize;
 305     int numChannels;
 306     char driver[64];
 307     oss_data *data;
 308     int ossFormat;
 309     int ossSpeed;
 310     char *err;
 311     int i;
 312
 313     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 314     driver[sizeof(driver)-1] = 0;
 315     if(!deviceName)
 316         deviceName = oss_device_capture;
 317     else if(strcmp(deviceName, oss_device_capture) != 0)
 318         return ALC_FALSE;
 319
 320     data = (oss_data*)calloc(1, sizeof(oss_data));
 321     data->killNow = 0;
 322
 323     data->fd = open(driver, O_RDONLY);
 324     if(data->fd == -1)
 325     {
 326         free(data);
 327         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 328         return ALC_FALSE;
 329     }
 330
 331     switch(aluBytesFromFormat(device->Format))
 332     {
 333         case 1:
 334             ossFormat = AFMT_U8;
 335             break;
 336         case 2:
 337             ossFormat = AFMT_S16_NE;
 338             break;
 339         default:
 340             AL_PRINT("Unknown format: 0x%x\n", device->Format);
 341             close(data->fd);
 342             free(data);
 343             return ALC_FALSE;
 344     }
 345
 346     periods = 4;
 347     numChannels = aluChannelsFromFormat(device->Format);
 348     frameSize = numChannels * aluBytesFromFormat(device->Format);
 349     ossSpeed = device->Frequency;
 350     log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
 351                              frameSize / periods);
 352
 353     /* according to the OSS spec, 16 bytes are the minimum */
 354     if (log2FragmentSize < 4)
 355         log2FragmentSize = 4;
 356     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 357
 358 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 359     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 360           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 361           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 362           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 363           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 364     {
 365         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 366         close(data->fd);
 367         free(data);
 368         return ALC_FALSE;
 369     }
 370 #undef ok
 371
 372     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 373     {
 374         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 375         close(data->fd);
 376         free(data);
 377         return ALC_FALSE;
 378     }
 379
 380     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 381          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 382     {
 383         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 384         close(data->fd);
 385         free(data);
 386         return ALC_FALSE;
 387     }
 388
 389     data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
 390     if(!data->ring)
 391     {
 392         AL_PRINT("ring buffer create failed\n");
 393         close(data->fd);
 394         free(data);
 395         return ALC_FALSE;
 396     }
 397
 398     data->data_size = info.fragsize;
 399     data->mix_data = calloc(1, data->data_size);
 400
 401     device->ExtraData = data;
 402     data->thread = StartThread(OSSCaptureProc, device);
 403     if(data->thread == NULL)
 404     {
 405         device->ExtraData = NULL;
 406         free(data->mix_data);
 407         free(data);
 408         return ALC_FALSE;
 409     }
 410
 411     device->szDeviceName = strdup(deviceName);
 412     return ALC_TRUE;
 413 }
 414
 415 static void oss_close_capture(ALCdevice *device)
 416 {
 417     oss_data *data = (oss_data*)device->ExtraData;
 418     data->killNow = 1;
 419     StopThread(data->thread);
 420
 421     close(data->fd);
 422
 423     DestroyRingBuffer(data->ring);
 424
 425     free(data->mix_data);
 426     free(data);
 427     device->ExtraData = NULL;
 428 }
 429
 430 static void oss_start_capture(ALCdevice *pDevice)
 431 {
 432     oss_data *data = (oss_data*)pDevice->ExtraData;
 433     data->doCapture = 1;
 434 }
 435
 436 static void oss_stop_capture(ALCdevice *pDevice)
 437 {
 438     oss_data *data = (oss_data*)pDevice->ExtraData;
 439     data->doCapture = 0;
 440 }
 441
 442 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 443 {
 444     oss_data *data = (oss_data*)pDevice->ExtraData;
 445     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 446         ReadRingBuffer(data->ring, pBuffer, lSamples);
 447     else
 448         SetALCError(ALC_INVALID_VALUE);
 449 }
 450
 451 static ALCuint oss_available_samples(ALCdevice *pDevice)
 452 {
 453     oss_data *data = (oss_data*)pDevice->ExtraData;
 454     return RingBufferSize(data->ring);
 455 }
 456
 457
 458 BackendFuncs oss_funcs = {
 459     oss_open_playback,
 460     oss_close_playback,
 461     oss_reset_playback,
 462     oss_stop_playback,
 463     oss_open_capture,
 464     oss_close_capture,
 465     oss_start_capture,
 466     oss_stop_capture,
 467     oss_capture_samples,
 468     oss_available_samples
 469 };
 470
 471 void alc_oss_init(BackendFuncs *func_list)
 472 {
 473     *func_list = oss_funcs;
 474 }
 475
 476 void alc_oss_deinit(void)
 477 {
 478 }
 479
 480 void alc_oss_probe(int type)
 481 {
 482     if(type == DEVICE_PROBE)
 483         AppendDeviceList(oss_device);
 484     else if(type == ALL_DEVICE_PROBE)
 485         AppendAllDeviceList(oss_device);
 486     else if(type == CAPTURE_DEVICE_PROBE)
 487         AppendCaptureDeviceList(oss_device_capture);
 488 }