sys/ao/ao.c

   1 #undef _GNU_SOURCE
   2 #define _GNU_SOURCE
   3 #include <string.h>
   4
   5 #include <unistd.h>
   6 #include <sys/ioctl.h>
   7
   8 #include <stdlib.h>
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include <fcntl.h>
  12
  13 #include <ao/ao.h>
  14
  15 #include "defs.h"
  16 #include "pcm.h"
  17 #include "rc.h"
  18
  19 struct pcm pcm;
  20
  21 static int stereo = 1;
  22 static int samplerate = 44100;
  23 static int sound = 1;
  24 static ao_device *device;
  25 static ao_sample_format format;
  26 static int aodriver;
  27
  28
  29 rcvar_t pcm_exports[] =
  30 {
  31         RCV_BOOL("sound", &sound),
  32         RCV_INT("stereo", &stereo),
  33         RCV_INT("samplerate", &samplerate),
  34         RCV_END
  35 };
  36
  37
  38 static void no_sound(void) {
  39         pcm.hz = 11025;
  40         pcm.len = 4096;
  41         pcm.buf = malloc(pcm.len);
  42         pcm.pos = 0;
  43 }
  44
  45 void pcm_init()
  46 {
  47         if (!sound)
  48         {
  49                 no_sound();
  50                 return;
  51         }
  52
  53         ao_initialize();
  54         format.bits = 8;
  55         format.channels = 2;
  56         format.rate = samplerate;
  57         format.byte_format = AO_FMT_LITTLE;
  58         aodriver = ao_default_driver_id();
  59         device = ao_open_live(aodriver, &format, NULL);
  60
  61         if(!device) {
  62                 no_sound();
  63                 return;
  64         }
  65
  66         pcm.stereo = 1;
  67         pcm.hz = samplerate;
  68         pcm.len = samplerate / 60;
  69         pcm.buf = malloc(pcm.len);
  70 }
  71
  72 void pcm_close()
  73 {
  74         if (pcm.buf) free(pcm.buf);
  75         memset(&pcm, 0, sizeof pcm);
  76         if(device) ao_close(device);
  77 }
  78
  79 int pcm_submit()
  80 {
  81         if (!device)
  82         {
  83                 pcm.pos = 0;
  84                 return 0;
  85         }
  86         if (pcm.buf) ao_play(device, pcm.buf, pcm.pos);
  87         pcm.pos = 0;
  88         return 1;
  89 }