[PATCH 2/5] dmusic: Set attenuation based on SF_GEN_INITIAL_ATTENUATION.

[Anton Baskanov]

From: Anton Baskanov

---
 dlls/dmusic/instrument.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dlls/dmusic/instrument.c b/dlls/dmusic/instrument.c
index 2c7bfc7862a..13f0434f677 100644
--- a/dlls/dmusic/instrument.c
+++ b/dlls/dmusic/instrument.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */

+#include <math.h>
+
 #include "dmusic_private.h"
 #include "soundfont.h"
 #include "dls2.h"
@@ -563,6 +565,7 @@ static HRESULT instrument_add_soundfont_region(struct instrument *This, struct s
     UINT start_loop, end_loop, unity_note, sample_index = generators->amount[SF_GEN_SAMPLE_ID].value;
     struct sf_sample *sample = soundfont->shdr + sample_index;
     struct region *region;
+    double attenuation;

if (!(region = calloc(1, sizeof(*region)))) return E_OUTOFMEMORY;
     list_init(&region->articulations);
@@ -574,11 +577,15 @@ static HRESULT instrument_add_soundfont_region(struct instrument *This, struct s

region->wave_link.ulTableIndex = sample_index;

+    /* SF2 implementation for the original hardware applies a factor of 0.4 to
+     * the attenuation value. Although this does not comply with the SF2 spec,
+     * most soundfonts expect this behavior. */
+    attenuation = (SHORT)generators->amount[SF_GEN_INITIAL_ATTENUATION].value * 0.4;
     unity_note = generators->amount[SF_GEN_OVERRIDING_ROOT_KEY].value;
     if (unity_note == (WORD)-1) unity_note = sample->original_key;
     region->wave_sample.usUnityNote = unity_note - (SHORT)generators->amount[SF_GEN_COARSE_TUNE].value;
     region->wave_sample.sFineTune = generators->amount[SF_GEN_FINE_TUNE].value;
-    region->wave_sample.lAttenuation = sample->correction;
+    region->wave_sample.lAttenuation = (LONG)floor(attenuation * -65536. + 0.5);

start_loop = generators->amount[SF_GEN_STARTLOOP_ADDRS_OFFSET].value;
     start_loop += generators->amount[SF_GEN_STARTLOOP_ADDRS_COARSE_OFFSET].value * 32768;