mciqtz32: Use dB unit when setting audio volume.

Signed-off-by: Akihiro Sagawa <sagawa.aki@gmail.com> Signed-off-by: Andrew Eikum <aeikum@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

mciqtz32: Use dB unit when setting audio volume.
cab9db9d · Akihiro Sagawa · Alexandre Julliard · 3d94c1ac · cab9db9d
Commit cab9db9d authored Jul 09, 2016 by Akihiro Sagawa Committed by Alexandre Julliard Jul 14, 2016
Hide whitespace changes
Inline Side-by-side

Showing with 7 additions and 2 deletions

mciqtz.c dlls/mciqtz32/mciqtz.c +7 -2

No files found.
--- a/dlls/mciqtz32/mciqtz.c
+++ b/dlls/mciqtz32/mciqtz.c
@@ -19,6 +19,7 @@
 */

 #include <stdarg.h>
+#include <math.h>
 #include "windef.h"
 #include "winbase.h"
 #include "winuser.h"
@@ -1070,7 +1071,7 @@ static DWORD MCIQTZ_mciSetAudio(UINT wDevID, DWORD dwFlags, LPMCI_DGV_SETAUDIO_P
        switch (lpParms->dwItem) {
        case MCI_DGV_SETAUDIO_VOLUME:
            if (dwFlags & MCI_DGV_SETAUDIO_VALUE) {
-                long vol = -10000;
+                long vol;
                HRESULT hr;
                if (lpParms->dwValue > 1000) {
                    ret = MCIERR_OUTOFRANGE;
@@ -1078,7 +1079,11 @@ static DWORD MCIQTZ_mciSetAudio(UINT wDevID, DWORD dwFlags, LPMCI_DGV_SETAUDIO_P
                }
                if (dwFlags & MCI_TEST)
                    break;
-                vol += (long)lpParms->dwValue * 10;
+                if (lpParms->dwValue != 0)
+                    vol = (long)(2000.0 * (log10(lpParms->dwValue) - 3.0));
+                else
+                    vol = -10000;
+                TRACE("Setting volume to %ld\n", vol);
                hr = IBasicAudio_put_Volume(wma->audio, vol);
                if (FAILED(hr)) {
                    WARN("Cannot set volume (hr = %x)\n", hr);