FF7/PSX/Sound/Opcodes/0xa8aa - Revision history

Loveemu at 02:43, 13 June 2020

2020-06-13T02:43:28Z

Loveemu: Add default value information of opcode A8.

2020-06-13T02:42:59Z

Add default value information of opcode A8.

Loveemu at 15:07, 10 June 2020

2020-06-10T15:07:00Z

Loveemu: Add formula for generating the volume table. (linear curve)

2020-06-10T15:06:41Z

Add formula for generating the volume table. (linear curve)

Loveemu: Fix code block formatting

2020-05-07T14:41:34Z

Fix code block formatting

Vegetass4: From Wiki Backup Dec 10 2017. This page was last modified on 23 September 2007, at 20:30.

2020-01-06T15:23:30Z

From Wiki Backup Dec 10 2017. This page was last modified on 23 September 2007, at 20:30.

New page

== 0xA8, 0xAA, 0xA3 (Channel Volume, Pan, Volume Modifier) ==
0xA8 has one 8-bit parameter, which used in calculation of base channel volume.

0xAA has one 8-bit parameter, which used in calculation of channel pan (difference between left and right channel volume).

0xA3 has one 8-bit parameter, which used in calculation of base channel volume.

Understanding of this opcodes isn't that easy, but here is what I have got:

=== Volume Calculation ===
// Compiler optimizer (at least I think so :)) generated following tables to speedup volume calculation for left & right volume.

const uint16_t m_AKAO_VOLUME_TABLE_L[256] = {

0x7f80, 0x7e80, 0x7d80, 0x7c80, 0x7b80, 0x7a80, 0x7980, 0x7880,
0x7780, 0x7680, 0x7580, 0x7480, 0x7380, 0x7280, 0x7180, 0x7080,
0x6f80, 0x6e80, 0x6d80, 0x6c80, 0x6b80, 0x6a80, 0x6980, 0x6880,
0x6780, 0x6680, 0x6580, 0x6480, 0x6380, 0x6280, 0x6180, 0x6080,
0x5f80, 0x5e80, 0x5d80, 0x5c80, 0x5b80, 0x5a80, 0x5980, 0x5880,
0x5780, 0x5680, 0x5580, 0x5480, 0x5380, 0x5280, 0x5180, 0x5080,
0x4f80, 0x4e80, 0x4d80, 0x4c80, 0x4b80, 0x4a80, 0x4980, 0x4880,
0x4780, 0x4680, 0x4580, 0x4480, 0x4380, 0x4280, 0x4180, 0x4080,
0x3f80, 0x3e80, 0x3d80, 0x3c80, 0x3b80, 0x3a80, 0x3980, 0x3880,
0x3780, 0x3680, 0x3580, 0x3480, 0x3380, 0x3280, 0x3180, 0x3080,
0x2f80, 0x2e80, 0x2d80, 0x2c80, 0x2b80, 0x2a80, 0x2980, 0x2880,
0x2780, 0x2680, 0x2580, 0x2480, 0x2380, 0x2280, 0x2180, 0x2080,
0x1f80, 0x1e80, 0x1d80, 0x1c80, 0x1b80, 0x1a80, 0x1980, 0x1880,
0x1780, 0x1680, 0x1580, 0x1480, 0x1380, 0x1280, 0x1180, 0x1080,
0x0f80, 0x0e80, 0x0d80, 0x0c80, 0x0b80, 0x0a80, 0x0980, 0x0880,
0x0780, 0x0680, 0x0580, 0x0480, 0x0380, 0x0280, 0x0180, 0x0080,
0x0000, 0xffff, 0xfffc, 0xfff7, 0xfff0, 0xffe7, 0xffdc, 0xffcf,
0xffc0, 0xffaf, 0xff9c, 0xff87, 0xff70, 0xff57, 0xff3c, 0xff1f,
0xff00, 0xfedf, 0xfebc, 0xfe97, 0xfe70, 0xfe47, 0xfe1c, 0xfdef,
0xfdc0, 0xfd8f, 0xfd5c, 0xfd27, 0xfcf0, 0xfcb7, 0xfc7c, 0xfc3f,
0xfc00, 0xfbbf, 0xfb7c, 0xfb37, 0xfaf0, 0xfaa7, 0xfa5c, 0xfa0f,
0xf9c0, 0xf96f, 0xf91c, 0xf8c7, 0xf870, 0xf817, 0xf7bc, 0xf75f,
0xf700, 0xf69f, 0xf63c, 0xf5d7, 0xf570, 0xf507, 0xf49c, 0xf42f,
0xf3c0, 0xf34f, 0xf2dc, 0xf267, 0xf1f0, 0xf177, 0xf0fc, 0xf07f,
0x1000, 0x1081, 0x1104, 0x1189, 0x1210, 0x1299, 0x1324, 0x13b1,
0x1440, 0x14d1, 0x1564, 0x15f9, 0x1690, 0x1729, 0x17c4, 0x1861,
0x1900, 0x19a1, 0x1a44, 0x1ae9, 0x1b90, 0x1c39, 0x1ce4, 0x1d91,
0x1e40, 0x1ef1, 0x1fa4, 0x2059, 0x2110, 0x21c9, 0x2284, 0x2341,
0x2400, 0x24c1, 0x2584, 0x2649, 0x2710, 0x27d9, 0x28a4, 0x2971,
0x2a40, 0x2b11, 0x2be4, 0x2cb9, 0x2d90, 0x2e69, 0x2f44, 0x3021,
0x3100, 0x31e1, 0x32c4, 0x33a9, 0x3490, 0x3579, 0x3664, 0x3751,
0x3840, 0x3931, 0x3a24, 0x3b19, 0x3c10, 0x3d09, 0x3e04, 0x3f01
};

const uint16_t m_AKAO_VOLUME_TABLE_R[256] = {

0x0080, 0x0180, 0x0280, 0x0380, 0x0480, 0x0580, 0x0680, 0x0780,
0x0880, 0x0980, 0x0a80, 0x0b80, 0x0c80, 0x0d80, 0x0e80, 0x0f80,
0x1080, 0x1180, 0x1280, 0x1380, 0x1480, 0x1580, 0x1680, 0x1780,
0x1880, 0x1980, 0x1a80, 0x1b80, 0x1c80, 0x1d80, 0x1e80, 0x1f80,
0x2080, 0x2180, 0x2280, 0x2380, 0x2480, 0x2580, 0x2680, 0x2780,
0x2880, 0x2980, 0x2a80, 0x2b80, 0x2c80, 0x2d80, 0x2e80, 0x2f80,
0x3080, 0x3180, 0x3280, 0x3380, 0x3480, 0x3580, 0x3680, 0x3780,
0x3880, 0x3980, 0x3a80, 0x3b80, 0x3c80, 0x3d80, 0x3e80, 0x3f80,
0x4080, 0x4180, 0x4280, 0x4380, 0x4480, 0x4580, 0x4680, 0x4780,
0x4880, 0x4980, 0x4a80, 0x4b80, 0x4c80, 0x4d80, 0x4e80, 0x4f80,
0x5080, 0x5180, 0x5280, 0x5380, 0x5480, 0x5580, 0x5680, 0x5780,
0x5880, 0x5980, 0x5a80, 0x5b80, 0x5c80, 0x5d80, 0x5e80, 0x5f80,
0x6080, 0x6180, 0x6280, 0x6380, 0x6480, 0x6580, 0x6680, 0x6780,
0x6880, 0x6980, 0x6a80, 0x6b80, 0x6c80, 0x6d80, 0x6e80, 0x6f80,
0x7080, 0x7180, 0x7280, 0x7380, 0x7480, 0x7580, 0x7680, 0x7780,
0x7880, 0x7980, 0x7a80, 0x7b80, 0x7c80, 0x7d80, 0x7e80, 0x7f80,
0x3f01, 0x3e04, 0x3d09, 0x3c10, 0x3b19, 0x3a24, 0x3931, 0x3840,
0x3751, 0x3664, 0x3579, 0x3490, 0x33a9, 0x32c4, 0x31e1, 0x3100,
0x3021, 0x2f44, 0x2e69, 0x2d90, 0x2cb9, 0x2be4, 0x2b11, 0x2a40,
0x2971, 0x28a4, 0x27d9, 0x2710, 0x2649, 0x2584, 0x24c1, 0x2400,
0x2341, 0x2284, 0x21c9, 0x2110, 0x2059, 0x1fa4, 0x1ef1, 0x1e40,
0x1d91, 0x1ce4, 0x1c39, 0x1b90, 0x1ae9, 0x1a44, 0x19a1, 0x1900,
0x1861, 0x17c4, 0x1729, 0x1690, 0x15f9, 0x1564, 0x14d1, 0x1440,
0x13dc, 0x1324, 0x1299, 0x1210, 0x1189, 0x1104, 0x1081, 0x1000,
0xf07f, 0xf0fc, 0xf177, 0xf1f0, 0xf267, 0xf2dc, 0xf34f, 0xf3c0,
0xf42f, 0xf49c, 0xf507, 0xf570, 0xf5d7, 0xf63c, 0xf69f, 0xf700,
0xf75f, 0xf7bc, 0xf817, 0xf870, 0xf8c7, 0xf91c, 0xf843, 0xf9c0,
0xfa0f, 0xfa5c, 0xfaa7, 0xfaf0, 0xfb37, 0xfb7c, 0xfbbf, 0xfc00,
0xfc3f, 0xfc7c, 0xfcb7, 0xfcf0, 0xfd27, 0xfd5c, 0xfd8f, 0xfdc0,
0xfdef, 0xfe1c, 0xfe47, 0xfe70, 0xfe97, 0xfebc, 0xfedf, 0xff00,
0xff1f, 0xff3c, 0xff57, 0xff70, 0xff87, 0xff9c, 0xffaf, 0xffc0,
0xffcf, 0xffdc, 0xffe7, 0xfff0, 0xfff7, 0xfffc, 0xffff, 0x0000
};

left_volume = m_AKAO_VOLUME_TABLE_L[aa_parameter] * ((a8_parameter * a3_parameter * 0x7f) / 128) / 256 / 128;

right_volume = m_AKAO_VOLUME_TABLE_R[aa_parameter] * ((a8_parameter * a3_paramater * 0x7f) / 128) / 256 / 128;

If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.

I'll remove these tables in future and add normal mathematical interpretation of volume calculation.

← Older revision		Revision as of 02:43, 13 June 2020
Line 54:		Line 54:
	If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.		If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.

−	If there is no A8 opcode in sequence, default value 0x7f.fe is used. (More precisely, ~~0x3FFF~~ is stored in memory.)	+	If there is no A8 opcode in sequence, default value 0x7f.fe is used. (More precisely, 0x3fff is stored in memory.)

← Older revision		Revision as of 02:42, 13 June 2020
Line 53:		Line 53:

	If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.		If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.
		+
		+	If there is no A8 opcode in sequence, default value 0x7f.fe is used. (More precisely, 0x3FFF is stored in memory.)

← Older revision		Revision as of 15:07, 10 June 2020
Line 5:		Line 5:

	0xA3 has one 8-bit parameter, which used in calculation of base channel volume.		0xA3 has one 8-bit parameter, which used in calculation of base channel volume.
−
−	~~Understanding of this opcodes isn't that easy, but here is what I have got:~~

	=== Volume Calculation ===		=== Volume Calculation ===

@@ Line 9: / Line 9: @@
 === Volume Calculation ===
-  const uint16_t m_AKAO_VOLUME_TABLE_L[256] = {
+ // m_AKAO_VOLUME_TABLE_L[i] = 32768 - m_AKAO_VOLUME_TABLE_R[i];
 x7f80, 0x7e80, 0x7d80, 0x7c80, 0x7b80, 0x7a80, 0x7980, 0x7880,
 x7780, 0x7680, 0x7580, 0x7480, 0x7380, 0x7280, 0x7180, 0x7080,
@@ Line 27: / Line 27: @@
 x1780, 0x1680, 0x1580, 0x1480, 0x1380, 0x1280, 0x1180, 0x1080,
 x0f80, 0x0e80, 0x0d80, 0x0c80, 0x0b80, 0x0a80, 0x0980, 0x0880,
-x0780, 0x0680, 0x0580, 0x0480, 0x0380, 0x0280, 0x0180, 0x0080,
+x0780, 0x0680, 0x0580, 0x0480, 0x0380, 0x0280, 0x0180, 0x0080
   };
-  const uint16_t m_AKAO_VOLUME_TABLE_R[256] = {
+ // m_AKAO_VOLUME_TABLE_R[i] = i * 256 + 128;
 x0080, 0x0180, 0x0280, 0x0380, 0x0480, 0x0580, 0x0680, 0x0780,
 x0880, 0x0980, 0x0a80, 0x0b80, 0x0c80, 0x0d80, 0x0e80, 0x0f80,
@@ Line 62: / Line 47: @@
 x6880, 0x6980, 0x6a80, 0x6b80, 0x6c80, 0x6d80, 0x6e80, 0x6f80,
 x7080, 0x7180, 0x7280, 0x7380, 0x7480, 0x7580, 0x7680, 0x7780,
-x7880, 0x7980, 0x7a80, 0x7b80, 0x7c80, 0x7d80, 0x7e80, 0x7f80,
+x7880, 0x7980, 0x7a80, 0x7b80, 0x7c80, 0x7d80, 0x7e80, 0x7f80
   };
@@ Line 86: / Line 55: @@
 If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.

@@ Line 11: / Line 11: @@
 // Compiler optimizer (at least I think so :)) generated following tables to speedup volume calculation for left & right volume.
-const uint16_t m_AKAO_VOLUME_TABLE_L[256] = {
+ const uint16_t m_AKAO_VOLUME_TABLE_L[256] = {
 x7f80, 0x7e80, 0x7d80, 0x7c80, 0x7b80, 0x7a80, 0x7980, 0x7880,
 x7780, 0x7680, 0x7580, 0x7480, 0x7380, 0x7280, 0x7180, 0x7080,
@@ Line 45: / Line 44: @@
 x3100, 0x31e1, 0x32c4, 0x33a9, 0x3490, 0x3579, 0x3664, 0x3751,
 x3840, 0x3931, 0x3a24, 0x3b19, 0x3c10, 0x3d09, 0x3e04, 0x3f01
-};
+ };
-−
-const uint16_t m_AKAO_VOLUME_TABLE_R[256] = {
+ const uint16_t m_AKAO_VOLUME_TABLE_R[256] = {
 x0080, 0x0180, 0x0280, 0x0380, 0x0480, 0x0580, 0x0680, 0x0780,
 x0880, 0x0980, 0x0a80, 0x0b80, 0x0c80, 0x0d80, 0x0e80, 0x0f80,
@@ Line 81: / Line 79: @@
 xff1f, 0xff3c, 0xff57, 0xff70, 0xff87, 0xff9c, 0xffaf, 0xffc0,
 xffcf, 0xffdc, 0xffe7, 0xfff0, 0xfff7, 0xfffc, 0xffff, 0x0000
-};
+ };
-−
-left_volume = m_AKAO_VOLUME_TABLE_L[aa_parameter] * ((a8_parameter * a3_parameter * 0x7f) / 128) / 256 / 128;
+ left_volume = m_AKAO_VOLUME_TABLE_L[aa_parameter] * ((a8_parameter * a3_parameter * 0x7f) / 128) / 256 / 128;
-−
-right_volume = m_AKAO_VOLUME_TABLE_R[aa_parameter] * ((a8_parameter * a3_paramater * 0x7f) / 128) / 256 / 128;
+ right_volume = m_AKAO_VOLUME_TABLE_R[aa_parameter] * ((a8_parameter * a3_paramater * 0x7f) / 128) / 256 / 128;
 If there is no A3 opcode in sequence (as in SENSUI.SND for example), default value 0x7f is used.
 I'll remove these tables in future and add normal mathematical interpretation of volume calculation.