snd_oss.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program 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.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20
  21 // OSS module, used by Linux and FreeBSD
  22
  23 #include "quakedef.h"
  24
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/ioctl.h>
  28 #include <sys/soundcard.h>
  29 #include <unistd.h>
  30
  31 #include "snd_main.h"
  32
  33
  34 #define NB_FRAGMENTS 4
  35
  36 static int audio_fd = -1;
  37 static int old_osstime = 0;
  38 static unsigned int osssoundtime;
  39
  40
  41 /*
  42 ====================
  43 SndSys_Init
  44
  45 Create "snd_renderbuffer" with the proper sound format if the call is successful
  46 May return a suggested format if the requested format isn't available
  47 ====================
  48 */
  49 qboolean SndSys_Init (const snd_format_t* requested, snd_format_t* suggested)
  50 {
  51         int flags, ioctl_param, prev_value;
  52         unsigned int fragmentsize;
  53
  54         Con_DPrint("SndSys_Init: using the OSS module\n");
  55
  56         // Check the requested sound format
  57         if (requested->width < 1 || requested->width > 2)
  58         {
  59                 Con_Printf("SndSys_Init: invalid sound width (%hu)\n",
  60                                         requested->width);
  61
  62                 if (suggested != NULL)
  63                 {
  64                         memcpy(suggested, requested, sizeof(*suggested));
  65
  66                         if (requested->width < 1)
  67                                 suggested->width = 1;
  68                         else
  69                                 suggested->width = 2;
  70                 }
  71
  72                 return false;
  73     }
  74
  75         // Open /dev/dsp
  76     audio_fd = open("/dev/dsp", O_WRONLY);
  77         if (audio_fd < 0)
  78         {
  79                 perror("/dev/dsp");
  80                 Con_Print("SndSys_Init: could not open /dev/dsp\n");
  81                 return false;
  82         }
  83
  84         // Use non-blocking IOs if possible
  85         flags = fcntl(audio_fd, F_GETFL);
  86         if (flags != -1)
  87         {
  88                 if (fcntl(audio_fd, F_SETFL, flags | O_NONBLOCK) == -1)
  89                         Con_Print("SndSys_Init : fcntl(F_SETFL, O_NONBLOCK) failed!\n");
  90         }
  91         else
  92                 Con_Print("SndSys_Init: fcntl(F_GETFL) failed!\n");
  93
  94         // Set the fragment size (up to "NB_FRAGMENTS" fragments of "fragmentsize" bytes)
  95         fragmentsize = requested->speed * requested->channels * requested->width / 10;
  96         fragmentsize = (unsigned int)ceilf((float)fragmentsize / (float)NB_FRAGMENTS);
  97         fragmentsize = CeilPowerOf2(fragmentsize);
  98         ioctl_param = (NB_FRAGMENTS << 16) | log2i(fragmentsize);
  99         if (ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &ioctl_param) == -1)
 100         {
 101                 Con_Print ("SndSys_Init: could not set the fragment size\n");
 102                 SndSys_Shutdown ();
 103                 return false;
 104         }
 105         Con_Printf ("SndSys_Init: using %u fragments of %u bytes\n",
 106                                 ioctl_param >> 16, 1 << (ioctl_param & 0xFFFF));
 107
 108         // Set the sound width
 109         if (requested->width == 1)
 110                 ioctl_param = AFMT_U8;
 111         else
 112                 ioctl_param = AFMT_S16_NE;
 113         prev_value = ioctl_param;
 114         if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &ioctl_param) == -1 ||
 115                 ioctl_param != prev_value)
 116         {
 117                 if (ioctl_param != prev_value && suggested != NULL)
 118                 {
 119                         memcpy(suggested, requested, sizeof(*suggested));
 120
 121                         if (ioctl_param == AFMT_S16_NE)
 122                                 suggested->width = 2;
 123                         else
 124                                 suggested->width = 1;
 125                 }
 126
 127                 Con_Printf("SndSys_Init: could not set the sound width to %hu\n",
 128                                         requested->width);
 129                 SndSys_Shutdown();
 130                 return false;
 131         }
 132
 133         // Set the sound channels
 134         ioctl_param = requested->channels;
 135         if (ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &ioctl_param) == -1 ||
 136                 ioctl_param != requested->channels)
 137         {
 138                 if (ioctl_param != requested->channels && suggested != NULL)
 139                 {
 140                         memcpy(suggested, requested, sizeof(*suggested));
 141                         suggested->channels = ioctl_param;
 142                 }
 143
 144                 Con_Printf("SndSys_Init: could not set the number of channels to %hu\n",
 145                                         requested->channels);
 146                 SndSys_Shutdown();
 147                 return false;
 148         }
 149
 150         // Set the sound speed
 151         ioctl_param = requested->speed;
 152         if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &ioctl_param) == -1 ||
 153                 (unsigned int)ioctl_param != requested->speed)
 154         {
 155                 if ((unsigned int)ioctl_param != requested->speed && suggested != NULL)
 156                 {
 157                         memcpy(suggested, requested, sizeof(*suggested));
 158                         suggested->speed = ioctl_param;
 159                 }
 160
 161                 Con_Printf("SndSys_Init: could not set the sound speed to %u\n",
 162                                         requested->speed);
 163                 SndSys_Shutdown();
 164                 return false;
 165         }
 166
 167         // TOCHECK: I'm not sure which channel layout OSS uses for 5.1 and 7.1
 168         if (snd_channellayout.integer == SND_CHANNELLAYOUT_AUTO)
 169                 Cvar_SetValueQuick (&snd_channellayout, SND_CHANNELLAYOUT_ALSA);
 170
 171         old_osstime = 0;
 172         osssoundtime = 0;
 173         snd_renderbuffer = Snd_CreateRingBuffer(requested, 0, NULL);
 174         return true;
 175 }
 176
 177
 178 /*
 179 ====================
 180 SndSys_Shutdown
 181
 182 Stop the sound card, delete "snd_renderbuffer" and free its other resources
 183 ====================
 184 */
 185 void SndSys_Shutdown (void)
 186 {
 187         // Stop the sound and close the device
 188         if (audio_fd >= 0)
 189         {
 190                 ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
 191                 close(audio_fd);
 192                 audio_fd = -1;
 193         }
 194
 195         if (snd_renderbuffer != NULL)
 196         {
 197                 Mem_Free(snd_renderbuffer->ring);
 198                 Mem_Free(snd_renderbuffer);
 199                 snd_renderbuffer = NULL;
 200         }
 201 }
 202
 203
 204 /*
 205 ====================
 206 SndSys_Write
 207 ====================
 208 */
 209 static int SndSys_Write (const unsigned char* buffer, unsigned int nb_bytes)
 210 {
 211         int written;
 212         unsigned int factor;
 213
 214         written = write (audio_fd, buffer, nb_bytes);
 215         if (written < 0)
 216         {
 217                 if (errno != EAGAIN)
 218                         Con_Printf ("SndSys_Write: audio write returned %d! (errno= %d)\n",
 219                                                 written, errno);
 220                 return written;
 221         }
 222
 223         factor = snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
 224         if (written % factor != 0)
 225                 Sys_Error ("SndSys_Write: nb of bytes written (%d) isn't aligned to a frame sample!\n",
 226                                    written);
 227
 228         snd_renderbuffer->startframe += written / factor;
 229
 230         if ((unsigned int)written < nb_bytes)
 231         {
 232                 Con_DPrintf("SndSys_Submit: audio can't keep up! (%u < %u)\n",
 233                                         written, nb_bytes);
 234         }
 235
 236         return written;
 237 }
 238
 239
 240 /*
 241 ====================
 242 SndSys_Submit
 243
 244 Submit the contents of "snd_renderbuffer" to the sound card
 245 ====================
 246 */
 247 void SndSys_Submit (void)
 248 {
 249         unsigned int startoffset, factor, limit, nbframes;
 250         int written;
 251
 252         if (audio_fd < 0 ||
 253                 snd_renderbuffer->startframe == snd_renderbuffer->endframe)
 254                 return;
 255
 256         startoffset = snd_renderbuffer->startframe % snd_renderbuffer->maxframes;
 257         factor = snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
 258         limit = snd_renderbuffer->maxframes - startoffset;
 259         nbframes = snd_renderbuffer->endframe - snd_renderbuffer->startframe;
 260         if (nbframes > limit)
 261         {
 262                 written = SndSys_Write (&snd_renderbuffer->ring[startoffset * factor], limit * factor);
 263                 if (written < 0 || (unsigned int)written < limit * factor)
 264                         return;
 265
 266                 nbframes -= limit;
 267                 startoffset = 0;
 268         }
 269
 270         SndSys_Write (&snd_renderbuffer->ring[startoffset * factor], nbframes * factor);
 271 }
 272
 273
 274 /*
 275 ====================
 276 SndSys_GetSoundTime
 277
 278 Returns the number of sample frames consumed since the sound started
 279 ====================
 280 */
 281 unsigned int SndSys_GetSoundTime (void)
 282 {
 283         struct count_info count;
 284         int new_osstime;
 285         unsigned int timediff;
 286
 287         if (ioctl (audio_fd, SNDCTL_DSP_GETOPTR, &count) == -1)
 288         {
 289                 Con_Print ("SndSys_GetSoundTimeDiff: can't ioctl (SNDCTL_DSP_GETOPTR)\n");
 290                 return 0;
 291         }
 292         new_osstime = count.bytes / (snd_renderbuffer->format.width * snd_renderbuffer->format.channels);
 293
 294         if (new_osstime >= old_osstime)
 295                 timediff = new_osstime - old_osstime;
 296         else
 297         {
 298                 Con_Print ("SndSys_GetSoundTime: osstime wrapped\n");
 299                 timediff = 0;
 300         }
 301
 302         old_osstime = new_osstime;
 303         osssoundtime += timediff;
 304         return osssoundtime;
 305 }
 306
 307
 308 /*
 309 ====================
 310 SndSys_LockRenderBuffer
 311
 312 Get the exclusive lock on "snd_renderbuffer"
 313 ====================
 314 */
 315 qboolean SndSys_LockRenderBuffer (void)
 316 {
 317         // Nothing to do
 318         return true;
 319 }
 320
 321
 322 /*
 323 ====================
 324 SndSys_UnlockRenderBuffer
 325
 326 Release the exclusive lock on "snd_renderbuffer"
 327 ====================
 328 */
 329 void SndSys_UnlockRenderBuffer (void)
 330 {
 331         // Nothing to do
 332 }