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tag: 20121227
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109 lines (87 sloc) 2.333 kB
/* public domain */
#include "qemu-common.h"
#include "audio.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;
}
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