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