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 remaining = 0;
  83     int wrote;
  84
  85     while(!data->killNow)
  86     {
  87         int len = data->data_size - remaining;
  88
  89         if(len > 0)
  90         {
  91             SuspendContext(NULL);
  92             aluMixData(pDevice->Context, data->mix_data+remaining, len, pDevice->Format);
  93             ProcessContext(NULL);
  94         }
  95
  96         remaining += len;
  97         wrote = write(data->fd, data->mix_data, remaining);
  98         if(wrote < 0)
  99         {
 100             AL_PRINT("write failed: %s\n", strerror(errno));
 101             remaining = 0;
 102         }
 103         else if(wrote > 0)
 104         {
 105             remaining -= wrote;
 106             if(remaining > 0)
 107                 memmove(data->mix_data, data->mix_data+wrote, remaining);
 108         }
 109         else
 110             Sleep(1);
 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     int numFragmentsLogSize;
 149     int log2FragmentSize;
 150     unsigned int periods;
 151     audio_buf_info info;
 152     ALuint frameSize;
 153     char driver[64];
 154     int numChannels;
 155     oss_data *data;
 156     int ossFormat;
 157     int ossSpeed;
 158     char *err;
 159     int i;
 160
 161     strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
 162     driver[sizeof(driver)-1] = 0;
 163     if(deviceName)
 164     {
 165         if(strcmp(deviceName, oss_device))
 166             return ALC_FALSE;
 167         device->szDeviceName = oss_device;
 168     }
 169     else
 170         device->szDeviceName = oss_device;
 171
 172     data = (oss_data*)calloc(1, sizeof(oss_data));
 173     data->killNow = 0;
 174
 175     data->fd = open(driver, O_WRONLY);
 176     if(data->fd == -1)
 177     {
 178         free(data);
 179         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 180         return ALC_FALSE;
 181     }
 182
 183     switch(aluBytesFromFormat(device->Format))
 184     {
 185         case 1:
 186             ossFormat = AFMT_U8;
 187             break;
 188         case 2:
 189             ossFormat = AFMT_S16_NE;
 190             break;
 191         default:
 192             ossFormat = -1;
 193             AL_PRINT("Unknown format?! %x\n", device->Format);
 194     }
 195
 196     periods = GetConfigValueInt("oss", "periods", 4);
 197     if((int)periods <= 0)
 198         periods = 4;
 199     numChannels = aluChannelsFromFormat(device->Format);
 200     frameSize = numChannels * aluBytesFromFormat(device->Format);
 201
 202     ossSpeed = device->Frequency;
 203     log2FragmentSize = log2i(device->UpdateSize * frameSize / periods);
 204
 205     /* according to the OSS spec, 16 bytes are the minimum */
 206     if (log2FragmentSize < 4)
 207         log2FragmentSize = 4;
 208     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 209
 210 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 211     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 212           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 213           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 214           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 215           ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
 216     {
 217         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 218         close(data->fd);
 219         free(data);
 220         return ALC_FALSE;
 221     }
 222 #undef ok
 223
 224     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 225     {
 226         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 227         close(data->fd);
 228         free(data);
 229         return ALC_FALSE;
 230     }
 231
 232     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 233          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 234     {
 235         AL_PRINT("Could not set %d-bit output, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 236         close(data->fd);
 237         free(data);
 238         return ALC_FALSE;
 239     }
 240
 241     data->data_size = device->UpdateSize * frameSize;
 242     data->mix_data = calloc(1, data->data_size);
 243
 244     device->ExtraData = data;
 245     data->thread = StartThread(OSSProc, device);
 246     if(data->thread == NULL)
 247     {
 248         device->ExtraData = NULL;
 249         free(data->mix_data);
 250         free(data);
 251         return ALC_FALSE;
 252     }
 253
 254     device->Frequency = ossSpeed;
 255     device->UpdateSize = info.fragsize / frameSize;
 256
 257     return ALC_TRUE;
 258 }
 259
 260 static void oss_close_playback(ALCdevice *device)
 261 {
 262     oss_data *data = (oss_data*)device->ExtraData;
 263     data->killNow = 1;
 264     StopThread(data->thread);
 265
 266     close(data->fd);
 267
 268     free(data->mix_data);
 269     free(data);
 270     device->ExtraData = NULL;
 271 }
 272
 273
 274 static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 275 {
 276     int numFragmentsLogSize;
 277     int log2FragmentSize;
 278     unsigned int periods;
 279     audio_buf_info info;
 280     ALuint frameSize;
 281     int numChannels;
 282     char driver[64];
 283     oss_data *data;
 284     int ossFormat;
 285     int ossSpeed;
 286     char *err;
 287     int i;
 288
 289     strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
 290     driver[sizeof(driver)-1] = 0;
 291     if(deviceName)
 292     {
 293         if(strcmp(deviceName, oss_device_capture))
 294             return ALC_FALSE;
 295         device->szDeviceName = oss_device_capture;
 296     }
 297     else
 298         device->szDeviceName = oss_device_capture;
 299
 300     data = (oss_data*)calloc(1, sizeof(oss_data));
 301     data->killNow = 0;
 302
 303     data->fd = open(driver, O_RDONLY);
 304     if(data->fd == -1)
 305     {
 306         free(data);
 307         AL_PRINT("Could not open %s: %s\n", driver, strerror(errno));
 308         return ALC_FALSE;
 309     }
 310
 311     switch(aluBytesFromFormat(format))
 312     {
 313         case 1:
 314             ossFormat = AFMT_U8;
 315             break;
 316         case 2:
 317             ossFormat = AFMT_S16_NE;
 318             break;
 319         default:
 320             ossFormat = -1;
 321             AL_PRINT("Unknown format?! %x\n", device->Format);
 322     }
 323
 324     periods = 4;
 325     numChannels = aluChannelsFromFormat(device->Format);
 326     frameSize = numChannels * aluBytesFromFormat(device->Format);
 327     ossSpeed = frequency;
 328     log2FragmentSize = log2i(SampleSize * frameSize / periods);
 329
 330     /* according to the OSS spec, 16 bytes are the minimum */
 331     if (log2FragmentSize < 4)
 332         log2FragmentSize = 4;
 333     numFragmentsLogSize = (periods << 16) | log2FragmentSize;
 334
 335 #define ok(func, str) (i=(func),((i<0)?(err=(str)),0:1))
 336     if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
 337           ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
 338           ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
 339           ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
 340           ok(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info), "get space")))
 341     {
 342         AL_PRINT("%s failed: %s\n", err, strerror(errno));
 343         close(data->fd);
 344         free(data);
 345         return ALC_FALSE;
 346     }
 347 #undef ok
 348
 349     if((int)aluChannelsFromFormat(device->Format) != numChannels)
 350     {
 351         AL_PRINT("Could not set %d channels, got %d instead\n", aluChannelsFromFormat(device->Format), numChannels);
 352         close(data->fd);
 353         free(data);
 354         return ALC_FALSE;
 355     }
 356
 357     if(!((ossFormat == AFMT_U8 && aluBytesFromFormat(device->Format) == 1) ||
 358          (ossFormat == AFMT_S16_NE && aluBytesFromFormat(device->Format) == 2)))
 359     {
 360         AL_PRINT("Could not set %d-bit input, got format %#x\n", aluBytesFromFormat(device->Format)*8, ossFormat);
 361         close(data->fd);
 362         free(data);
 363         return ALC_FALSE;
 364     }
 365
 366     data->ring = CreateRingBuffer(frameSize, SampleSize);
 367     if(!data->ring)
 368     {
 369         AL_PRINT("ring buffer create failed\n");
 370         close(data->fd);
 371         free(data);
 372         return ALC_FALSE;
 373     }
 374
 375     data->data_size = info.fragsize;
 376     data->mix_data = calloc(1, data->data_size);
 377
 378     device->ExtraData = data;
 379     data->thread = StartThread(OSSCaptureProc, device);
 380     if(data->thread == NULL)
 381     {
 382         device->ExtraData = NULL;
 383         free(data->mix_data);
 384         free(data);
 385         return ALC_FALSE;
 386     }
 387
 388     return ALC_TRUE;
 389 }
 390
 391 static void oss_close_capture(ALCdevice *device)
 392 {
 393     oss_data *data = (oss_data*)device->ExtraData;
 394     data->killNow = 1;
 395     StopThread(data->thread);
 396
 397     close(data->fd);
 398
 399     DestroyRingBuffer(data->ring);
 400
 401     free(data->mix_data);
 402     free(data);
 403     device->ExtraData = NULL;
 404 }
 405
 406 static void oss_start_capture(ALCdevice *pDevice)
 407 {
 408     oss_data *data = (oss_data*)pDevice->ExtraData;
 409     data->doCapture = 1;
 410 }
 411
 412 static void oss_stop_capture(ALCdevice *pDevice)
 413 {
 414     oss_data *data = (oss_data*)pDevice->ExtraData;
 415     data->doCapture = 0;
 416 }
 417
 418 static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 419 {
 420     oss_data *data = (oss_data*)pDevice->ExtraData;
 421     if(lSamples <= (ALCuint)RingBufferSize(data->ring))
 422         ReadRingBuffer(data->ring, pBuffer, lSamples);
 423     else
 424         SetALCError(ALC_INVALID_VALUE);
 425 }
 426
 427 static ALCuint oss_available_samples(ALCdevice *pDevice)
 428 {
 429     oss_data *data = (oss_data*)pDevice->ExtraData;
 430     return RingBufferSize(data->ring);
 431 }
 432
 433
 434 BackendFuncs oss_funcs = {
 435     oss_open_playback,
 436     oss_close_playback,
 437     oss_open_capture,
 438     oss_close_capture,
 439     oss_start_capture,
 440     oss_stop_capture,
 441     oss_capture_samples,
 442     oss_available_samples
 443 };
 444
 445 void alc_oss_init(BackendFuncs *func_list)
 446 {
 447     *func_list = oss_funcs;
 448
 449     oss_device = AppendDeviceList("OSS Software");
 450     AppendAllDeviceList(oss_device);
 451
 452     oss_device_capture = AppendCaptureDeviceList("OSS Capture");
 453 }