LXR qemu/audio/audio_win

   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
  14int 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
  54int 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
 109