audio/audio_win_int.c

   1 /* public domain */
   2
   3 #include "qemu/osdep.h"
   4
   5 #define AUDIO_CAP "win-int"
   6 #include <windows.h>
   7 #include <mmreg.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->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 AUDIO_FORMAT_S8:
  27     case AUDIO_FORMAT_U8:
  28         wfx->wFormatTag = WAVE_FORMAT_PCM;
  29         wfx->wBitsPerSample = 8;
  30         break;
  31
  32     case AUDIO_FORMAT_S16:
  33     case AUDIO_FORMAT_U16:
  34         wfx->wFormatTag = WAVE_FORMAT_PCM;
  35         wfx->wBitsPerSample = 16;
  36         wfx->nAvgBytesPerSec <<= 1;
  37         wfx->nBlockAlign <<= 1;
  38         break;
  39
  40     case AUDIO_FORMAT_S32:
  41     case AUDIO_FORMAT_U32:
  42         wfx->wFormatTag = WAVE_FORMAT_PCM;
  43         wfx->wBitsPerSample = 32;
  44         wfx->nAvgBytesPerSec <<= 2;
  45         wfx->nBlockAlign <<= 2;
  46         break;
  47
  48     case AUDIO_FORMAT_F32:
  49         wfx->wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
  50         wfx->wBitsPerSample = 32;
  51         wfx->nAvgBytesPerSec <<= 2;
  52         wfx->nBlockAlign <<= 2;
  53         break;
  54
  55     default:
  56         dolog("Internal logic error: Bad audio format %d\n", as->fmt);
  57         return -1;
  58     }
  59
  60     return 0;
  61 }
  62
  63 int waveformat_to_audio_settings (WAVEFORMATEX *wfx,
  64                                   struct audsettings *as)
  65 {
  66     if (!wfx->nSamplesPerSec) {
  67         dolog ("Invalid wave format, frequency is zero\n");
  68         return -1;
  69     }
  70     as->freq = wfx->nSamplesPerSec;
  71
  72     switch (wfx->nChannels) {
  73     case 1:
  74         as->nchannels = 1;
  75         break;
  76
  77     case 2:
  78         as->nchannels = 2;
  79         break;
  80
  81     default:
  82         dolog (
  83             "Invalid wave format, number of channels is not 1 or 2, but %d\n",
  84             wfx->nChannels
  85             );
  86         return -1;
  87     }
  88
  89     if (wfx->wFormatTag == WAVE_FORMAT_PCM) {
  90         switch (wfx->wBitsPerSample) {
  91         case 8:
  92             as->fmt = AUDIO_FORMAT_U8;
  93             break;
  94
  95         case 16:
  96             as->fmt = AUDIO_FORMAT_S16;
  97             break;
  98
  99         case 32:
 100             as->fmt = AUDIO_FORMAT_S32;
 101             break;
 102
 103         default:
 104             dolog("Invalid PCM wave format, bits per sample is not "
 105                   "8, 16 or 32, but %d\n",
 106                   wfx->wBitsPerSample);
 107             return -1;
 108         }
 109     } else if (wfx->wFormatTag == WAVE_FORMAT_IEEE_FLOAT) {
 110         switch (wfx->wBitsPerSample) {
 111         case 32:
 112             as->fmt = AUDIO_FORMAT_F32;
 113             break;
 114
 115         default:
 116             dolog("Invalid IEEE_FLOAT wave format, bits per sample is not "
 117                   "32, but %d\n",
 118                   wfx->wBitsPerSample);
 119             return -1;
 120         }
 121     } else {
 122         dolog("Invalid wave format, tag is not PCM and not IEEE_FLOAT, "
 123               "but %d\n",
 124               wfx->wFormatTag);
 125         return -1;
 126     }
 127
 128     return 0;
 129 }
 130