Attempt to decompile _getVol

src/include/lib/lib_3e8c0.h

@@ -42,7 +42,6 @@ u32 func0003e8c0(void);
 s32 n_alEnvmixerParam(void *filter, s32 paramID, void *param);
 u32 func0003f328(void);
 u32 func0003f60c(void);
-u32 func0003f81c(void);
 u32 func0003f8a0(void);
 u32 func00040164(void);
 u32 func00040dac(void);

src/lib/lib_37b00.c

@@ -1260,7 +1260,7 @@ glabel func00038924
 /*    389fc:	87240010 */ 	lh	$a0,0x10($t9)
 /*    38a00:	8f250028 */ 	lw	$a1,0x28($t9)
 /*    38a04:	8726001a */ 	lh	$a2,0x1a($t9)
-/*    38a08:	0c00fe07 */ 	jal	func0003f81c
+/*    38a08:	0c00fe07 */ 	jal	_getVol
 /*    38a0c:	97270018 */ 	lhu	$a3,0x18($t9)
 /*    38a10:	8fa80018 */ 	lw	$t0,0x18($sp)
 /*    38a14:	a5020010 */ 	sh	$v0,0x10($t0)
@@ -1268,7 +1268,7 @@ glabel func00038924
 /*    38a1c:	85240012 */ 	lh	$a0,0x12($t1)
 /*    38a20:	8d250028 */ 	lw	$a1,0x28($t1)
 /*    38a24:	85260020 */ 	lh	$a2,0x20($t1)
-/*    38a28:	0c00fe07 */ 	jal	func0003f81c
+/*    38a28:	0c00fe07 */ 	jal	_getVol
 /*    38a2c:	9527001e */ 	lhu	$a3,0x1e($t1)
 /*    38a30:	8faa0018 */ 	lw	$t2,0x18($sp)
 /*    38a34:	a5420012 */ 	sh	$v0,0x12($t2)

src/lib/lib_3e8c0.c

@@ -5660,7 +5660,7 @@ glabel func0003e8c0
 /*    3ecec:	85c4005c */ 	lh	$a0,0x5c($t6)
 /*    3ecf0:	8dc50070 */ 	lw	$a1,0x70($t6)
 /*    3ecf4:	85c60066 */ 	lh	$a2,0x66($t6)
-/*    3ecf8:	0c00fe07 */ 	jal	func0003f81c
+/*    3ecf8:	0c00fe07 */ 	jal	_getVol
 /*    3ecfc:	95c70064 */ 	lhu	$a3,0x64($t6)
 /*    3ed00:	8faf0050 */ 	lw	$t7,0x50($sp)
 /*    3ed04:	a5e2005c */ 	sh	$v0,0x5c($t7)
@@ -5668,7 +5668,7 @@ glabel func0003e8c0
 /*    3ed0c:	8524005e */ 	lh	$a0,0x5e($t1)
 /*    3ed10:	8d250070 */ 	lw	$a1,0x70($t1)
 /*    3ed14:	8526006c */ 	lh	$a2,0x6c($t1)
-/*    3ed18:	0c00fe07 */ 	jal	func0003f81c
+/*    3ed18:	0c00fe07 */ 	jal	_getVol
 /*    3ed1c:	9527006a */ 	lhu	$a3,0x6a($t1)
 /*    3ed20:	8fab0050 */ 	lw	$t3,0x50($sp)
 /*    3ed24:	a562005e */ 	sh	$v0,0x5e($t3)
@@ -6373,7 +6373,7 @@ glabel func0003f60c
 );
 
 GLOBAL_ASM(
-glabel func0003f81c
+glabel _getVol
 /*    3f81c:	00042400 */ 	sll	$a0,$a0,0x10
 /*    3f820:	00063400 */ 	sll	$a2,$a2,0x10
 /*    3f824:	00063403 */ 	sra	$a2,$a2,0x10
@@ -6411,6 +6411,28 @@ glabel func0003f81c
 /*    3f89c:	27bd0008 */ 	addiu	$sp,$sp,0x8
 );
 
+//s16 _getVol(s16 ivol, s32 samples, s16 ratem, u16 ratel)
+//{
+//	s32 sp4;
+//
+//	/*
+//	 * Rate values are actually rate^8
+//	 */
+//	samples >>= 3;
+//
+//	if (samples == 0) {
+//		return ivol;
+//	}
+//
+//	sp4 = ratel * samples;
+//	sp4 >>= 16;
+//	sp4 += ratem * samples;
+//
+//	ivol += sp4;
+//
+//	return ivol;
+//}
+
 GLOBAL_ASM(
 glabel func0003f8a0
 /*    3f8a0:	27bdfd90 */ 	addiu	$sp,$sp,-624