audio/audio_win_int.c

   1 /* public domain */
   2
   3 #include "qemu/osdep.h"
   4 #include "qemu-common.h"
   5
   6 #define AUDIO_CAP "win-int"
   7 #include <windows.h>
   8 #include <mmsystem.h>
   9
  10 #include "audio.h"
  11 #include "audio_int.h"
  12 #include "audio_win_int.h"
  13
  14 int waveformat_from_audio_settings (WAVEFORMATEX *wfx,
  15                                     struct audsettings *as)
  16 {
  17     memset (wfx, 0, sizeof (*wfx));
  18
  19     wfx->wFormatTag = WAVE_FORMAT_PCM;
  20     wfx->nChannels = as->nchannels;
  21     wfx->nSamplesPerSec = as->freq;
  22     wfx->nAvgBytesPerSec = as->freq << (as->nchannels == 2);
  23     wfx->nBlockAlign = 1 << (as->nchannels == 2);
  24     wfx->cbSize = 0;
  25
  26     switch (as->fmt) {
  27     case AUDIO_FORMAT_S8:
  28     case AUDIO_FORMAT_U8:
  29         wfx->wBitsPerSample = 8;
  30         break;
  31
  32     case AUDIO_FORMAT_S16:
  33     case AUDIO_FORMAT_U16:
  34         wfx->wBitsPerSample = 16;
  35         wfx->nAvgBytesPerSec <<= 1;
  36         wfx->nBlockAlign <<= 1;
  37         break;
  38
  39     case AUDIO_FORMAT_S32:
  40     case AUDIO_FORMAT_U32:
  41         wfx->wBitsPerSample = 32;
  42         wfx->nAvgBytesPerSec <<= 2;
  43         wfx->nBlockAlign <<= 2;
  44         break;
  45
  46     default:
  47         dolog ("Internal logic error: Bad audio format %d\n", as->freq);
  48         return -1;
  49     }
  50
  51     return 0;
  52 }
  53
  54 int waveformat_to_audio_settings (WAVEFORMATEX *wfx,
  55                                   struct audsettings *as)
  56 {
  57     if (wfx->wFormatTag != WAVE_FORMAT_PCM) {
  58         dolog ("Invalid wave format, tag is not PCM, but %d\n",
  59                wfx->wFormatTag);
  60         return -1;
  61     }
  62
  63     if (!wfx->nSamplesPerSec) {
  64         dolog ("Invalid wave format, frequency is zero\n");
  65         return -1;
  66     }
  67     as->freq = wfx->nSamplesPerSec;
  68
  69     switch (wfx->nChannels) {
  70     case 1:
  71         as->nchannels = 1;
  72         break;
  73
  74     case 2:
  75         as->nchannels = 2;
  76         break;
  77
  78     default:
  79         dolog (
  80             "Invalid wave format, number of channels is not 1 or 2, but %d\n",
  81             wfx->nChannels
  82             );
  83         return -1;
  84     }
  85
  86     switch (wfx->wBitsPerSample) {
  87     case 8:
  88         as->fmt = AUDIO_FORMAT_U8;
  89         break;
  90
  91     case 16:
  92         as->fmt = AUDIO_FORMAT_S16;
  93         break;
  94
  95     case 32:
  96         as->fmt = AUDIO_FORMAT_S32;
  97         break;
  98
  99     default:
 100         dolog ("Invalid wave format, bits per sample is not "
 101                "8, 16 or 32, but %d\n",
 102                wfx->wBitsPerSample);
 103         return -1;
 104     }
 105
 106     return 0;
 107 }
 108