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         SuspendContext(NULL);
  94         aluMixData(pDevice->Context, WritePtr, len/frameSize, pDevice->Format);
  95         ProcessContext(NULL);
  96
  97         while(len > 0 && !data->killNow)
  98         {
  99             wrote = write(data->fd, WritePtr, len);
 100             if(wrote < 0)
 101             {
 102                 if(errno != EAGAIN && errno != EWOULDBLOCK)
 103                 {
 104                     AL_PRINT("write failed: %s\n", strerror(errno));
 105                     aluHandleDisconnect(pDevice);
 106                     len = 0;
 107                 }
 108                 else
 109                     Sleep(1);
 110                 continue;
 111             }
 112
 113             len -= wrote;
 114             WritePtr += wrote;
 115         }
 116     }
 117
 118     return 0;
 119 }
 120
 121 static ALuint OSSCaptureProc(ALvoid *ptr)
 122 {
 123     ALCdevice *pDevice = (ALCdevice*)ptr;
 124     oss_data *data = (oss_data*)pDevice->ExtraData;
 125     int frameSize;
 126     int amt;
 127
 128     frameSize  = aluBytesFromFormat(pDevice->Format);
 129     frameSize *= aluChannelsFromFormat(pDevice->Format);
 130
 131     while(!data->killNow)
 132     {
 133         amt = read(data->fd, data->mix_data, data->data_size);
 134         if(amt < 0)
 135         {
 136             AL_PRINT("read failed: %s\n", strerror(errno));
 137             aluHandleDisconnect(pDevice);
 138             break;
 139         }
 140         if(amt == 0)
 141         {
 142             Sleep(1);
 143             continue;
 144         }
 145         if(data->doCapture)
 146             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 147     }
 148
 149     return 0;
 150 }
 151
 152 static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 153 {
 154     char driver[64];
 155     oss_data *data;
 156
 157     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 158     driver[sizeof(driver)-1] = 0;
 159     if(!deviceName)
 160         deviceName = oss_device;
 161     else if(strcmp(deviceName, oss_device) != 0)
 162         return ALC_FALSE;
 163
 164     data = (oss_data*)calloc(1, sizeof(oss_data));
 165     data->killNow = 0;
 166
 167     data->fd = open(driver, O_WRONLY);
 168     if(data->fd == -1)
 169     {
 170         free(data);
 171         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 172         return ALC_FALSE;
 173     }
 174
 175     device->szDeviceName = strdup(deviceName);
 176     device->ExtraData = data;
 177     return ALC_TRUE;
 178 }
 179
 180 static void oss_close_playback(ALCdevice *device)
 181 {
 182     oss_data *data = (oss_data*)device->ExtraData;
 183
 184     close(data->fd);
 185     free(data);
 186     device->ExtraData = NULL;
 187 }
 188
 189 static ALCboolean oss_start_context(ALCdevice *device, ALCcontext *context)
 190 {
 191     oss_data *data = (oss_data*)device->ExtraData;
 192     int numFragmentsLogSize;
 193     int log2FragmentSize;
 194     unsigned int periods;
 195     audio_buf_info info;
 196     ALuint frameSize;
 197     int numChannels;
 198     int ossFormat;
 199     int ossSpeed;
 200     char *err;
 201     int i;
 202     (void)context;
 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             ossFormat = -1;
 225             AL_PRINT("Unknown format?! %x\n", device->Format);
 226     }
 227
 228     periods = GetConfigValueInt("oss", "periods", 4);
 229     if((int)periods <= 0)
 230         periods = 4;
 231     numChannels = aluChannelsFromFormat(device->Format);
 232     frameSize = numChannels * aluBytesFromFormat(device->Format);
 233
 234     ossSpeed = device->Frequency;
 235     log2FragmentSize = log2i(device->BufferSize * frameSize / periods);
 236
 237     /* according to the OSS spec, 16 bytes are the minimum */
 238     if (log2FragmentSize < 4)
 239         log2FragmentSize = 4;
 240     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 241
 242 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 243     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 244           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 245           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 246           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 247           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 248     {
 249         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 250         return ALC_FALSE;
 251     }
 252 #undef ok
 253
 254     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 255     {
 256         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 257         return ALC_FALSE;
 258     }
 259
 260     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 261          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 262     {
 263         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 264         return ALC_FALSE;
 265     }
 266
 267     device->Frequency = ossSpeed;
 268     device->UpdateSize = info.fragsize / frameSize;
 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_context(ALCdevice *device, ALCcontext *context)
 285 {
 286     oss_data *data = (oss_data*)device->ExtraData;
 287     (void)context;
 288
 289     if(!data->thread)
 290         return;
 291
 292     data->killNow = 1;
 293     StopThread(data->thread);
 294     data->thread = NULL;
 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_capture;
 320     else if(strcmp(deviceName, oss_device_capture) != 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(aluBytesFromFormat(device->Format))
 335     {
 336         case 1:
 337             ossFormat = AFMT_U8;
 338             break;
 339         case 2:
 340             ossFormat = AFMT_S16_NE;
 341             break;
 342         default:
 343             ossFormat = -1;
 344             AL_PRINT("Unknown format?! %x\n", device->Format);
 345     }
 346
 347     periods = 4;
 348     numChannels = aluChannelsFromFormat(device->Format);
 349     frameSize = numChannels * aluBytesFromFormat(device->Format);
 350     ossSpeed = device->Frequency;
 351     log2FragmentSize = log2i(device->BufferSize * 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->BufferSize);
 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_start_context,
 462     oss_stop_context,
 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 }