audio/audio_win_int.c

/* public domain */

#include "qemu-common.h"

#define AUDIO_CAP "win-int"
#include <windows.h>
#include <mmsystem.h>

#include "audio.h"
#include "audio_int.h"
#include "audio_win_int.h"

int waveformat_from_audio_settings (WAVEFORMATEX *wfx,
                                    struct audsettings *as)
{
    memset (wfx, 0, sizeof (*wfx));

    wfx->wFormatTag = WAVE_FORMAT_PCM;
    wfx->nChannels = as->nchannels;
    wfx->nSamplesPerSec = as->freq;
    wfx->nAvgBytesPerSec = as->freq << (as->nchannels == 2);
    wfx->nBlockAlign = 1 << (as->nchannels == 2);
    wfx->cbSize = 0;

    switch (as->fmt) {
    case AUD_FMT_S8:
    case AUD_FMT_U8:
        wfx->wBitsPerSample = 8;
        break;

    case AUD_FMT_S16:
    case AUD_FMT_U16:
        wfx->wBitsPerSample = 16;
        wfx->nAvgBytesPerSec <<= 1;
        wfx->nBlockAlign <<= 1;
        break;

    case AUD_FMT_S32:
    case AUD_FMT_U32:
        wfx->wBitsPerSample = 32;
        wfx->nAvgBytesPerSec <<= 2;
        wfx->nBlockAlign <<= 2;
        break;

    default:
        dolog ("Internal logic error: Bad audio format %d\n", as->freq);
        return -1;
    }

    return 0;
}

int waveformat_to_audio_settings (WAVEFORMATEX *wfx,
                                  struct audsettings *as)
{
    if (wfx->wFormatTag != WAVE_FORMAT_PCM) {
        dolog ("Invalid wave format, tag is not PCM, but %d\n",
               wfx->wFormatTag);
        return -1;
    }

    if (!wfx->nSamplesPerSec) {
        dolog ("Invalid wave format, frequency is zero\n");
        return -1;
    }
    as->freq = wfx->nSamplesPerSec;

    switch (wfx->nChannels) {
    case 1:
        as->nchannels = 1;
        break;

    case 2:
        as->nchannels = 2;
        break;

    default:
        dolog (
            "Invalid wave format, number of channels is not 1 or 2, but %d\n",
            wfx->nChannels
            );
        return -1;
    }

    switch (wfx->wBitsPerSample) {
    case 8:
        as->fmt = AUD_FMT_U8;
        break;

    case 16:
        as->fmt = AUD_FMT_S16;
        break;

    case 32:
        as->fmt = AUD_FMT_S32;
        break;

    default:
        dolog ("Invalid wave format, bits per sample is not "
               "8, 16 or 32, but %d\n",
               wfx->wBitsPerSample);
        return -1;
    }

    return 0;
}