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 char *oss_device;
  51 static char *oss_device_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     int wrote;
  83
  84     while(!data->killNow)
  85     {
  86         ALint len = data->data_size;
  87         ALubyte *WritePtr = data->mix_data;
  88
  89         SuspendContext(NULL);
  90         aluMixData(pDevice->Context, WritePtr, len, pDevice->Format);
  91         ProcessContext(NULL);
  92
  93         while(len > 0 && !data->killNow)
  94         {
  95             wrote = write(data->fd, WritePtr, len);
  96             if(wrote < 0)
  97             {
  98                 if(errno != EAGAIN && errno != EWOULDBLOCK)
  99                 {
 100                     AL_PRINT("write failed: %s\n", strerror(errno));
 101                     len = 0;
 102                 }
 103                 else
 104                     Sleep(1);
 105                 continue;
 106             }
 107
 108             len -= wrote;
 109             WritePtr += wrote;
 110         }
 111     }
 112
 113     return 0;
 114 }
 115
 116 static ALuint OSSCaptureProc(ALvoid *ptr)
 117 {
 118     ALCdevice *pDevice = (ALCdevice*)ptr;
 119     oss_data *data = (oss_data*)pDevice->ExtraData;
 120     int frameSize;
 121     int amt;
 122
 123     frameSize  = aluBytesFromFormat(pDevice->Format);
 124     frameSize *= aluChannelsFromFormat(pDevice->Format);
 125
 126     while(!data->killNow)
 127     {
 128         amt = read(data->fd, data->mix_data, data->data_size);
 129         if(amt < 0)
 130         {
 131             AL_PRINT("read failed: %s\n", strerror(errno));
 132             break;
 133         }
 134         if(amt == 0)
 135         {
 136             Sleep(1);
 137             continue;
 138         }
 139         if(data->doCapture)
 140             WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
 141     }
 142
 143     return 0;
 144 }
 145
 146 static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
 147 {
 148     char driver[64];
 149     oss_data *data;
 150
 151     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 152     driver[sizeof(driver)-1] = 0;
 153     if(deviceName)
 154     {
 155         if(strcmp(deviceName, oss_device))
 156             return ALC_FALSE;
 157         device->szDeviceName = oss_device;
 158     }
 159     else
 160         device->szDeviceName = oss_device;
 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->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_start_context(ALCdevice *device, ALCcontext *context)
 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     (void)context;
 200
 201     switch(aluBytesFromFormat(device->Format))
 202     {
 203         case 1:
 204             ossFormat = AFMT_U8;
 205             break;
 206         case 4:
 207             switch(aluChannelsFromFormat(device->Format))
 208             {
 209                 case 1: device->Format = AL_FORMAT_MONO16; break;
 210                 case 2: device->Format = AL_FORMAT_STEREO16; break;
 211                 case 4: device->Format = AL_FORMAT_QUAD16; break;
 212                 case 6: device->Format = AL_FORMAT_51CHN16; break;
 213                 case 7: device->Format = AL_FORMAT_61CHN16; break;
 214                 case 8: device->Format = AL_FORMAT_71CHN16; break;
 215             }
 216             /* fall-through */
 217         case 2:
 218             ossFormat = AFMT_S16_NE;
 219             break;
 220         default:
 221             ossFormat = -1;
 222             AL_PRINT("Unknown format?! %x\n", device->Format);
 223     }
 224
 225     periods = GetConfigValueInt("oss", "periods", 4);
 226     if((int)periods <= 0)
 227         periods = 4;
 228     numChannels = aluChannelsFromFormat(device->Format);
 229     frameSize = numChannels * aluBytesFromFormat(device->Format);
 230
 231     ossSpeed = device->Frequency;
 232     log2FragmentSize = log2i(device->BufferSize * frameSize / periods);
 233
 234     /* according to the OSS spec, 16 bytes are the minimum */
 235     if (log2FragmentSize < 4)
 236         log2FragmentSize = 4;
 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
 267     data->data_size = device->UpdateSize * frameSize;
 268     data->mix_data = calloc(1, data->data_size);
 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_context(ALCdevice *device, ALCcontext *context)
 282 {
 283     oss_data *data = (oss_data*)device->ExtraData;
 284     (void)context;
 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     {
 317         if(strcmp(deviceName, oss_device_capture))
 318             return ALC_FALSE;
 319         device->szDeviceName = oss_device_capture;
 320     }
 321     else
 322         device->szDeviceName = oss_device_capture;
 323
 324     data = (oss_data*)calloc(1, sizeof(oss_data));
 325     data->killNow = 0;
 326
 327     data->fd = open(driver, O_RDONLY);
 328     if(data->fd == -1)
 329     {
 330         free(data);
 331         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 332         return ALC_FALSE;
 333     }
 334
 335     switch(aluBytesFromFormat(device->Format))
 336     {
 337         case 1:
 338             ossFormat = AFMT_U8;
 339             break;
 340         case 2:
 341             ossFormat = AFMT_S16_NE;
 342             break;
 343         default:
 344             ossFormat = -1;
 345             AL_PRINT("Unknown format?! %x\n", device->Format);
 346     }
 347
 348     periods = 4;
 349     numChannels = aluChannelsFromFormat(device->Format);
 350     frameSize = numChannels * aluBytesFromFormat(device->Format);
 351     ossSpeed = device->Frequency;
 352     log2FragmentSize = log2i(device->BufferSize * frameSize / periods);
 353
 354     /* according to the OSS spec, 16 bytes are the minimum */
 355     if (log2FragmentSize < 4)
 356         log2FragmentSize = 4;
 357     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 358
 359 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 360     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 361           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 362           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 363           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 364           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 365     {
 366         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 367         close(data->fd);
 368         free(data);
 369         return ALC_FALSE;
 370     }
 371 #undef ok
 372
 373     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 374     {
 375         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 376         close(data->fd);
 377         free(data);
 378         return ALC_FALSE;
 379     }
 380
 381     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 382          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 383     {
 384         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 385         close(data->fd);
 386         free(data);
 387         return ALC_FALSE;
 388     }
 389
 390     data->ring = CreateRingBuffer(frameSize, device->BufferSize);
 391     if(!data->ring)
 392     {
 393         AL_PRINT("ring buffer create failed\n");
 394         close(data->fd);
 395         free(data);
 396         return ALC_FALSE;
 397     }
 398
 399     data->data_size = info.fragsize;
 400     data->mix_data = calloc(1, data->data_size);
 401
 402     device->ExtraData = data;
 403     data->thread = StartThread(OSSCaptureProc, device);
 404     if(data->thread == NULL)
 405     {
 406         device->ExtraData = NULL;
 407         free(data->mix_data);
 408         free(data);
 409         return ALC_FALSE;
 410     }
 411
 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     oss_device = AppendDeviceList("OSS Software");
 476     AppendAllDeviceList(oss_device);
 477
 478     oss_device_capture = AppendCaptureDeviceList("OSS Capture");
 479 }