snd_bsd.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 #include <sys/param.h>
  22 #include <sys/audioio.h>
  23 #ifndef SUNOS
  24 #       include <sys/endian.h>
  25 #endif
  26 #include <sys/ioctl.h>
  27
  28 #include <fcntl.h>
  29 #ifndef SUNOS
  30 #       include <paths.h>
  31 #endif
  32 #include <unistd.h>
  33
  34 #include "quakedef.h"
  35 #include "snd_main.h"
  36
  37
  38 static int audio_fd = -1;
  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         unsigned int i;
  52         const char *snddev;
  53         audio_info_t info;
  54
  55         // Open the audio device
  56 #ifdef _PATH_SOUND
  57         snddev = _PATH_SOUND;
  58 #elif defined(SUNOS)
  59         snddev = "/dev/audio";
  60 #else
  61         snddev = "/dev/sound";
  62 #endif
  63         audio_fd = open (snddev, O_WRONLY | O_NDELAY | O_NONBLOCK);
  64         if (audio_fd < 0)
  65         {
  66                 Con_Printf("Can't open the sound device (%s)\n", snddev);
  67                 return false;
  68         }
  69
  70         AUDIO_INITINFO (&info);
  71 #ifdef AUMODE_PLAY      // NetBSD / OpenBSD
  72         info.mode = AUMODE_PLAY;
  73 #endif
  74         info.play.sample_rate = requested->speed;
  75         info.play.channels = requested->channels;
  76         info.play.precision = requested->width * 8;
  77         if (requested->width == 1)
  78 #ifdef SUNOS
  79                 info.play.encoding = AUDIO_ENCODING_LINEAR8;
  80 #else
  81                 info.play.encoding = AUDIO_ENCODING_ULINEAR;
  82 #endif
  83         else
  84 #ifdef SUNOS
  85                 info.play.encoding = AUDIO_ENCODING_LINEAR;
  86 #else
  87 #       if BYTE_ORDER == BIG_ENDIAN
  88                 info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
  89 #       else
  90                 info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
  91 #       endif
  92 #endif
  93
  94         if (ioctl (audio_fd, AUDIO_SETINFO, &info) == 0)
  95                 break;
  96
  97         // TODO: check the parameters with AUDIO_GETINFO
  98         // TODO: check AUDIO_ENCODINGFLAG_EMULATED with AUDIO_GETENC
  99
 100         snd_renderbuffer = Snd_CreateRingBuffer(requested, 0, NULL);
 101         return true;
 102 }
 103
 104
 105 /*
 106 ====================
 107 SndSys_Shutdown
 108
 109 Stop the sound card, delete "snd_renderbuffer" and free its other resources
 110 ====================
 111 */
 112 void SndSys_Shutdown (void)
 113 {
 114         if (audio_fd >= 0)
 115         {
 116                 close(audio_fd);
 117                 audio_fd = -1;
 118         }
 119
 120         if (snd_renderbuffer != NULL)
 121         {
 122                 Mem_Free(snd_renderbuffer->ring);
 123                 Mem_Free(snd_renderbuffer);
 124                 snd_renderbuffer = NULL;
 125         }
 126 }
 127
 128
 129 /*
 130 ====================
 131 SndSys_Submit
 132
 133 Submit the contents of "snd_renderbuffer" to the sound card
 134 ====================
 135 */
 136 void SndSys_Submit (void)
 137 {
 138         unsigned int startoffset, factor, limit, nbframes;
 139         int written;
 140
 141         if (audio_fd < 0 ||
 142                 snd_renderbuffer->startframe == snd_renderbuffer->endframe)
 143                 return;
 144
 145         startoffset = snd_renderbuffer->startframe % snd_renderbuffer->maxframes;
 146         factor = snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
 147         limit = snd_renderbuffer->maxframes - startoffset;
 148         nbframes = snd_renderbuffer->endframe - snd_renderbuffer->startframe;
 149         if (nbframes > limit)
 150         {
 151                 written = write (audio_fd, &snd_renderbuffer->ring[startoffset * factor], limit * factor);
 152                 if (written < 0)
 153                 {
 154                         Con_Printf("SndSys_Submit: audio write returned %d!\n", written);
 155                         return;
 156                 }
 157
 158                 if (written % factor != 0)
 159                         Sys_Error("SndSys_Submit: nb of bytes written (%d) isn't aligned to a frame sample!\n", written);
 160
 161                 snd_renderbuffer->startframe += written / factor;
 162
 163                 if ((unsigned int)written < limit * factor)
 164                 {
 165                         Con_Printf("SndSys_Submit: audio can't keep up! (%u < %u)\n", written, limit * factor);
 166                         return;
 167                 }
 168
 169                 nbframes -= limit;
 170                 startoffset = 0;
 171         }
 172
 173         written = write (audio_fd, &snd_renderbuffer->ring[startoffset * factor], nbframes * factor);
 174         if (written < 0)
 175         {
 176                 Con_Printf("SndSys_Submit: audio write returned %d!\n", written);
 177                 return;
 178         }
 179         snd_renderbuffer->startframe += written / factor;
 180 }
 181
 182
 183 /*
 184 ====================
 185 SndSys_GetSoundTime
 186
 187 Returns the number of sample frames consumed since the sound started
 188 ====================
 189 */
 190 unsigned int SndSys_GetSoundTime (void)
 191 {
 192         audio_info_t info;
 193
 194         if (ioctl (audio_fd, AUDIO_GETINFO, &info) < 0)
 195         {
 196                 Con_Print("Error: can't get audio info\n");
 197                 SNDDMA_Shutdown ();
 198                 return 0;
 199         }
 200
 201         return info.play.samples;
 202 }
 203
 204
 205 /*
 206 ====================
 207 SndSys_LockRenderBuffer
 208
 209 Get the exclusive lock on "snd_renderbuffer"
 210 ====================
 211 */
 212 qboolean SndSys_LockRenderBuffer (void)
 213 {
 214         // Nothing to do
 215         return true;
 216 }
 217
 218
 219 /*
 220 ====================
 221 SndSys_UnlockRenderBuffer
 222
 223 Release the exclusive lock on "snd_renderbuffer"
 224 ====================
 225 */
 226 void SndSys_UnlockRenderBuffer (void)
 227 {
 228         // Nothing to do
 229 }