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Diffstat (limited to 'qemu/audio/audio_win_int.c')
-rw-r--r--qemu/audio/audio_win_int.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/qemu/audio/audio_win_int.c b/qemu/audio/audio_win_int.c
new file mode 100644
index 000000000..e1324056a
--- /dev/null
+++ b/qemu/audio/audio_win_int.c
@@ -0,0 +1,107 @@
+/* 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;
+}
+