audio/audio_win_int.c

   1 /* public domain */
   2
   3 #include "qemu-common.h"
   4
   5 #define AUDIO_CAP "win-int"
   6 #include <windows.h>
   7 #include <mmsystem.h>
   8
   9 #include "audio.h"
  10 #include "audio_int.h"
  11 #include "audio_win_int.h"
  12
  13 int waveformat_from_audio_settings (WAVEFORMATEX *wfx,
  14                                     struct audsettings *as)
  15 {
  16     memset (wfx, 0, sizeof (*wfx));
  17
  18     wfx->wFormatTag = WAVE_FORMAT_PCM;
  19     wfx->nChannels = as->nchannels;
  20     wfx->nSamplesPerSec = as->freq;
  21     wfx->nAvgBytesPerSec = as->freq << (as->nchannels == 2);
  22     wfx->nBlockAlign = 1 << (as->nchannels == 2);
  23     wfx->cbSize = 0;
  24
  25     switch (as->fmt) {
  26     case AUD_FMT_S8:
  27     case AUD_FMT_U8:
  28         wfx->wBitsPerSample = 8;
  29         break;
  30
  31     case AUD_FMT_S16:
  32     case AUD_FMT_U16:
  33         wfx->wBitsPerSample = 16;
  34         wfx->nAvgBytesPerSec <<= 1;
  35         wfx->nBlockAlign <<= 1;
  36         break;
  37
  38     case AUD_FMT_S32:
  39     case AUD_FMT_U32:
  40         wfx->wBitsPerSample = 32;
  41         wfx->nAvgBytesPerSec <<= 2;
  42         wfx->nBlockAlign <<= 2;
  43         break;
  44
  45     default:
  46         dolog ("Internal logic error: Bad audio format %d\n", as->freq);
  47         return -1;
  48     }
  49
  50     return 0;
  51 }
  52
  53 int waveformat_to_audio_settings (WAVEFORMATEX *wfx,
  54                                   struct audsettings *as)
  55 {
  56     if (wfx->wFormatTag != WAVE_FORMAT_PCM) {
  57         dolog ("Invalid wave format, tag is not PCM, but %d\n",
  58                wfx->wFormatTag);
  59         return -1;
  60     }
  61
  62     if (!wfx->nSamplesPerSec) {
  63         dolog ("Invalid wave format, frequency is zero\n");
  64         return -1;
  65     }
  66     as->freq = wfx->nSamplesPerSec;
  67
  68     switch (wfx->nChannels) {
  69     case 1:
  70         as->nchannels = 1;
  71         break;
  72
  73     case 2:
  74         as->nchannels = 2;
  75         break;
  76
  77     default:
  78         dolog (
  79             "Invalid wave format, number of channels is not 1 or 2, but %d\n",
  80             wfx->nChannels
  81             );
  82         return -1;
  83     }
  84
  85     switch (wfx->wBitsPerSample) {
  86     case 8:
  87         as->fmt = AUD_FMT_U8;
  88         break;
  89
  90     case 16:
  91         as->fmt = AUD_FMT_S16;
  92         break;
  93
  94     case 32:
  95         as->fmt = AUD_FMT_S32;
  96         break;
  97
  98     default:
  99         dolog ("Invalid wave format, bits per sample is not "
 100                "8, 16 or 32, but %d\n",
 101                wfx->wBitsPerSample);
 102         return -1;
 103     }
 104
 105     return 0;
 106 }
 107