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 <mmreg.h>
   9#include <mmsystem.h>
  10
  11#include "audio.h"
  12#include "audio_int.h"
  13#include "audio_win_int.h"
  14
  15int 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
  64int 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
 132