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 #include "quakedef.h"
  21
  22 #include <sys/param.h>
  23 #include <sys/audioio.h>
  24 #ifndef SUNOS
  25 #       include <sys/endian.h>
  26 #endif
  27 #include <sys/ioctl.h>
  28
  29 #include <fcntl.h>
  30 #ifndef SUNOS
  31 #       include <paths.h>
  32 #endif
  33 #include <unistd.h>
  34
  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 (mem_bigendian)
  88                 info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
  89         else
  90                 info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
  91 #endif
  92
  93         if (ioctl (audio_fd, AUDIO_SETINFO, &info) != 0)
  94         {
  95                 Con_Printf("Can't set up the sound device (%s)\n", snddev);
  96                 return false;
  97         }
  98
  99         // TODO: check the parameters with AUDIO_GETINFO
 100         // TODO: check AUDIO_ENCODINGFLAG_EMULATED with AUDIO_GETENC
 101
 102         snd_renderbuffer = Snd_CreateRingBuffer(requested, 0, NULL);
 103         return true;
 104 }
 105
 106
 107 /*
 108 ====================
 109 SndSys_Shutdown
 110
 111 Stop the sound card, delete "snd_renderbuffer" and free its other resources
 112 ====================
 113 */
 114 void SndSys_Shutdown (void)
 115 {
 116         if (audio_fd >= 0)
 117         {
 118                 close(audio_fd);
 119                 audio_fd = -1;
 120         }
 121
 122         if (snd_renderbuffer != NULL)
 123         {
 124                 Mem_Free(snd_renderbuffer->ring);
 125                 Mem_Free(snd_renderbuffer);
 126                 snd_renderbuffer = NULL;
 127         }
 128 }
 129
 130
 131 /*
 132 ====================
 133 SndSys_Submit
 134
 135 Submit the contents of "snd_renderbuffer" to the sound card
 136 ====================
 137 */
 138 void SndSys_Submit (void)
 139 {
 140         unsigned int startoffset, factor, limit, nbframes;
 141         int written;
 142
 143         if (audio_fd < 0 ||
 144                 snd_renderbuffer->startframe == snd_renderbuffer->endframe)
 145                 return;
 146
 147         startoffset = snd_renderbuffer->startframe % snd_renderbuffer->maxframes;
 148         factor = snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
 149         limit = snd_renderbuffer->maxframes - startoffset;
 150         nbframes = snd_renderbuffer->endframe - snd_renderbuffer->startframe;
 151         if (nbframes > limit)
 152         {
 153                 written = write (audio_fd, &snd_renderbuffer->ring[startoffset * factor], limit * factor);
 154                 if (written < 0)
 155                 {
 156                         Con_Printf("SndSys_Submit: audio write returned %d!\n", written);
 157                         return;
 158                 }
 159
 160                 if (written % factor != 0)
 161                         Sys_Error("SndSys_Submit: nb of bytes written (%d) isn't aligned to a frame sample!\n", written);
 162
 163                 snd_renderbuffer->startframe += written / factor;
 164
 165                 if ((unsigned int)written < limit * factor)
 166                 {
 167                         Con_Printf("SndSys_Submit: audio can't keep up! (%u < %u)\n", written, limit * factor);
 168                         return;
 169                 }
 170
 171                 nbframes -= limit;
 172                 startoffset = 0;
 173         }
 174
 175         written = write (audio_fd, &snd_renderbuffer->ring[startoffset * factor], nbframes * factor);
 176         if (written < 0)
 177         {
 178                 Con_Printf("SndSys_Submit: audio write returned %d!\n", written);
 179                 return;
 180         }
 181         snd_renderbuffer->startframe += written / factor;
 182 }
 183
 184
 185 /*
 186 ====================
 187 SndSys_GetSoundTime
 188
 189 Returns the number of sample frames consumed since the sound started
 190 ====================
 191 */
 192 unsigned int SndSys_GetSoundTime (void)
 193 {
 194         audio_info_t info;
 195
 196         if (ioctl (audio_fd, AUDIO_GETINFO, &info) < 0)
 197         {
 198                 Con_Print("Error: can't get audio info\n");
 199                 SndSys_Shutdown ();
 200                 return 0;
 201         }
 202
 203         return info.play.samples;
 204 }
 205
 206
 207 /*
 208 ====================
 209 SndSys_LockRenderBuffer
 210
 211 Get the exclusive lock on "snd_renderbuffer"
 212 ====================
 213 */
 214 qboolean SndSys_LockRenderBuffer (void)
 215 {
 216         // Nothing to do
 217         return true;
 218 }
 219
 220
 221 /*
 222 ====================
 223 SndSys_UnlockRenderBuffer
 224
 225 Release the exclusive lock on "snd_renderbuffer"
 226 ====================
 227 */
 228 void SndSys_UnlockRenderBuffer (void)
 229 {
 230         // Nothing to do
 231 }
 232
 233 /*
 234 ====================
 235 SndSys_SendKeyEvents
 236
 237 Send keyboard events originating from the sound system (e.g. MIDI)
 238 ====================
 239 */
 240 void SndSys_SendKeyEvents(void)
 241 {
 242         // not supported
 243 }