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 <mmreg.h>
   9 #include <mmsystem.h>
  10
  11 #include "audio.h"
  12 #include "audio_int.h"
  13 #include "audio_win_int.h"
  14
  15 int waveformat_from_audio_settings (WAVEFORMATEX *wfx,
  16                                     struct audsettings *as)
  17 {
  18     memset (wfx, 0, sizeof (*wfx));
  19
  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->wFormatTag = WAVE_FORMAT_PCM;
  30         wfx->wBitsPerSample = 8;
  31         break;
  32
  33     case AUDIO_FORMAT_S16:
  34     case AUDIO_FORMAT_U16:
  35         wfx->wFormatTag = WAVE_FORMAT_PCM;
  36         wfx->wBitsPerSample = 16;
  37         wfx->nAvgBytesPerSec <<= 1;
  38         wfx->nBlockAlign <<= 1;
  39         break;
  40
  41     case AUDIO_FORMAT_S32:
  42     case AUDIO_FORMAT_U32:
  43         wfx->wFormatTag = WAVE_FORMAT_PCM;
  44         wfx->wBitsPerSample = 32;
  45         wfx->nAvgBytesPerSec <<= 2;
  46         wfx->nBlockAlign <<= 2;
  47         break;
  48
  49     case AUDIO_FORMAT_F32:
  50         wfx->wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
  51         wfx->wBitsPerSample = 32;
  52         wfx->nAvgBytesPerSec <<= 2;
  53         wfx->nBlockAlign <<= 2;
  54         break;
  55
  56     default:
  57         dolog("Internal logic error: Bad audio format %d\n", as->fmt);
  58         return -1;
  59     }
  60
  61     return 0;
  62 }
  63
  64 int waveformat_to_audio_settings (WAVEFORMATEX *wfx,
  65                                   struct audsettings *as)
  66 {
  67     if (!wfx->nSamplesPerSec) {
  68         dolog ("Invalid wave format, frequency is zero\n");
  69         return -1;
  70     }
  71     as->freq = wfx->nSamplesPerSec;
  72
  73     switch (wfx->nChannels) {
  74     case 1:
  75         as->nchannels = 1;
  76         break;
  77
  78     case 2:
  79         as->nchannels = 2;
  80         break;
  81
  82     default:
  83         dolog (
  84             "Invalid wave format, number of channels is not 1 or 2, but %d\n",
  85             wfx->nChannels
  86             );
  87         return -1;
  88     }
  89
  90     if (wfx->wFormatTag == WAVE_FORMAT_PCM) {
  91         switch (wfx->wBitsPerSample) {
  92         case 8:
  93             as->fmt = AUDIO_FORMAT_U8;
  94             break;
  95
  96         case 16:
  97             as->fmt = AUDIO_FORMAT_S16;
  98             break;
  99
 100         case 32:
 101             as->fmt = AUDIO_FORMAT_S32;
 102             break;
 103
 104         default:
 105             dolog("Invalid PCM wave format, bits per sample is not "
 106                   "8, 16 or 32, but %d\n",
 107                   wfx->wBitsPerSample);
 108             return -1;
 109         }
 110     } else if (wfx->wFormatTag == WAVE_FORMAT_IEEE_FLOAT) {
 111         switch (wfx->wBitsPerSample) {
 112         case 32:
 113             as->fmt = AUDIO_FORMAT_F32;
 114             break;
 115
 116         default:
 117             dolog("Invalid IEEE_FLOAT wave format, bits per sample is not "
 118                   "32, but %d\n",
 119                   wfx->wBitsPerSample);
 120             return -1;
 121         }
 122     } else {
 123         dolog("Invalid wave format, tag is not PCM and not IEEE_FLOAT, "
 124               "but %d\n",
 125               wfx->wFormatTag);
 126         return -1;
 127     }
 128
 129     return 0;
 130 }
 131