nds: drop APU frequency to 22050 Hz, minor optimization

asiekierka · Sep 27, 2023 · dd3918b · dd3918b
1 parent d76f8d8
commit dd3918b
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Showing 3 changed files with 3 additions and 3 deletions.
diff --git a/arm7/source/apu.c b/arm7/source/apu.c
@@ -14,7 +14,7 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
-static Sint32
+static Sint16
 envelope(NdsApu *c, Uint32 age)
 {
 	if(!c->r) return 0x0888;

diff --git a/arm9/source/nds_apu.c b/arm9/source/nds_apu.c
@@ -14,7 +14,7 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
-#define NOTE_PERIOD 0x10000
+#define NOTE_PERIOD (SAMPLE_FREQUENCY * 0x4000 / 11025)
 #define ADSR_STEP (SAMPLE_FREQUENCY / 0xf)
 
 /* clang-format off */

diff --git a/include/nds/apu.h b/include/nds/apu.h
@@ -14,7 +14,7 @@ WITH REGARD TO THIS SOFTWARE.
 typedef unsigned int Uint32;
 typedef signed int Sint32;
 
-#define SAMPLE_FREQUENCY 44100
+#define SAMPLE_FREQUENCY 22050
 #define POLYPHONY 4
 
 typedef struct {