out_sgi.c

   1 /*
   2
   3     PROGRAM_NAME PROGRAM_VERSION - PROGRAM_DESCRIPTION
   4
   5     Copyright (C) 2003 Angel Ortega <angel@triptico.com>
   6
   7     This program is free software; you can redistribute it and/or
   8     modify it under the terms of the GNU General Public License
   9     as published by the Free Software Foundation; either version 2
  10     of the License, or (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21     http://www.triptico.com
  22
  23 */
  24
  25 #include <stdio.h>
  26 #include <dmedia/audio.h>
  27
  28 #include "output.h"
  29
  30 /*******************
  31         Data
  32 ********************/
  33
  34 extern int _frequency;
  35
  36 /* audio configuration */
  37 static ALconfig ac;
  38
  39 /* audio port */
  40 static ALport ap;
  41
  42 /* handmade buffering */
  43 #ifndef BUFFER_SIZE
  44 #define BUFFER_SIZE 65536
  45 #endif
  46
  47 static short _buffer[BUFFER_SIZE];
  48 static int _bindex=0;
  49
  50
  51 /*******************
  52         Code
  53 ********************/
  54
  55 int _out_open_sgi(char * file)
  56 {
  57         ALpv p[1];
  58
  59         ac=alNewConfig();
  60
  61         if(!ac) return(-100);
  62
  63         if(alSetChannels(ac, AL_STEREO)==-1)
  64                 return(-101);
  65
  66         if(alSetWidth(ac, AL_SAMPLE_16)==-1)
  67                 return(-102);
  68
  69         if(alSetSampFmt(ac, AL_SAMPFMT_TWOSCOMP)==-1)
  70                 return(-103);
  71
  72         if(alSetQueueSize(ac, 131069)==-1)
  73                 return(-104);
  74
  75         if(alSetDevice(ac, AL_DEFAULT_OUTPUT)==-1)
  76                 return(-105);
  77
  78         p[0].param=AL_OUTPUT_RATE;
  79         p[0].value.ll=alDoubleToFixed((double)_frequency);
  80
  81         if(alSetParams(alGetDevice(ac), p, 1)==-1)
  82                 return(-106);
  83
  84         ap=alOpenPort("Ann Hell", "w", ac);
  85
  86         if(!ap) return(-107);
  87
  88         return(0);
  89 }
  90
  91
  92 int _out_write_sgi(int lsample, int rsample)
  93 {
  94         _buffer[_bindex++]=(short)lsample;
  95         _buffer[_bindex++]=(short)rsample;
  96
  97         if(_bindex==BUFFER_SIZE)
  98         {
  99                 alWriteFrames(ap, _buffer, BUFFER_SIZE / 2);
 100                 _bindex=0;
 101         }
 102
 103         return(0);
 104 }
 105
 106
 107 int _out_close_sgi(void)
 108 {
 109         alClosePort(ap);
 110         alFreeConfig(ac);
 111
 112         return(0);
 113 }