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mirror of https://github.com/OpenDiablo2/OpenDiablo2 synced 2024-10-31 16:27:18 -04:00
OpenDiablo2/Compression/Wav.go
Tim Sarbin 1afd86005e
Changes necessary for migration to org account (#67)
* Replaced old repo path with org path.

* Added editorconfig. Fixed line endings to LF.

* Fixed travis build badge path
2019-11-02 17:38:39 -04:00

132 lines
2.9 KiB
Go

package Compression
import (
"github.com/OpenDiablo2/OpenDiablo2/Common"
)
var sLookup = []int{
0x0007, 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E,
0x0010, 0x0011, 0x0013, 0x0015, 0x0017, 0x0019, 0x001C, 0x001F,
0x0022, 0x0025, 0x0029, 0x002D, 0x0032, 0x0037, 0x003C, 0x0042,
0x0049, 0x0050, 0x0058, 0x0061, 0x006B, 0x0076, 0x0082, 0x008F,
0x009D, 0x00AD, 0x00BE, 0x00D1, 0x00E6, 0x00FD, 0x0117, 0x0133,
0x0151, 0x0173, 0x0198, 0x01C1, 0x01EE, 0x0220, 0x0256, 0x0292,
0x02D4, 0x031C, 0x036C, 0x03C3, 0x0424, 0x048E, 0x0502, 0x0583,
0x0610, 0x06AB, 0x0756, 0x0812, 0x08E0, 0x09C3, 0x0ABD, 0x0BD0,
0x0CFF, 0x0E4C, 0x0FBA, 0x114C, 0x1307, 0x14EE, 0x1706, 0x1954,
0x1BDC, 0x1EA5, 0x21B6, 0x2515, 0x28CA, 0x2CDF, 0x315B, 0x364B,
0x3BB9, 0x41B2, 0x4844, 0x4F7E, 0x5771, 0x602F, 0x69CE, 0x7462,
0x7FFF,
}
var sLookup2 = []int{
-1, 0, -1, 4, -1, 2, -1, 6,
-1, 1, -1, 5, -1, 3, -1, 7,
-1, 1, -1, 5, -1, 3, -1, 7,
-1, 2, -1, 4, -1, 6, -1, 8,
}
func WavDecompress(data []byte, channelCount int) []byte {
Array1 := []int{0x2c, 0x2c}
Array2 := make([]int, channelCount)
input := Common.CreateStreamReader(data)
output := Common.CreateStreamWriter()
input.GetByte()
shift := input.GetByte()
for i := 0; i < channelCount; i++ {
temp := input.GetInt16()
Array2[i] = int(temp)
output.PushSWord(temp)
}
channel := channelCount - 1
for input.GetPosition() < input.GetSize() {
value := input.GetByte()
if channelCount == 2 {
channel = 1 - channel
}
if (value & 0x80) != 0 {
switch value & 0x7f {
case 0:
if Array1[channel] != 0 {
Array1[channel]--
}
output.PushSWord(int16(Array2[channel]))
break
case 1:
Array1[channel] += 8
if Array1[channel] > 0x58 {
Array1[channel] = 0x58
}
if channelCount == 2 {
channel = 1 - channel
}
break
case 2:
break
default:
Array1[channel] -= 8
if Array1[channel] < 0 {
Array1[channel] = 0
}
if channelCount == 2 {
channel = 1 - channel
}
break
}
} else {
temp1 := sLookup[Array1[channel]]
temp2 := temp1 >> shift
if (value & 1) != 0 {
temp2 += temp1 >> 0
}
if (value & 2) != 0 {
temp2 += temp1 >> 1
}
if (value & 4) != 0 {
temp2 += temp1 >> 2
}
if (value & 8) != 0 {
temp2 += temp1 >> 3
}
if (value & 0x10) != 0 {
temp2 += temp1 >> 4
}
if (value & 0x20) != 0 {
temp2 += temp1 >> 5
}
temp3 := Array2[channel]
if (value & 0x40) != 0 {
temp3 -= temp2
if temp3 <= -32768 {
temp3 = -32768
}
} else {
temp3 += temp2
if temp3 >= 32767 {
temp3 = 32767
}
}
Array2[channel] = temp3
output.PushSWord(int16(temp3))
Array1[channel] += sLookup2[value&0x1f]
if Array1[channel] < 0 {
Array1[channel] = 0
} else {
if Array1[channel] > 0x58 {
Array1[channel] = 0x58
}
}
}
}
return output.GetBytes()
}