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(AdpDecoder): made re-usable.

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This commit is contained in:
morkt 2017-12-13 13:25:17 +04:00
parent 45e086583c
commit c864eaa606
1 changed files with 15 additions and 3 deletions
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18
ArcFormats/Abogado/AudioADP.cs
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@ -91,9 +91,20 @@ namespace GameRes.Formats.Abogado
internal class AdpDecoder internal class AdpDecoder
{ {
int prev_sample = 0; int prev_sample;
int quant_idx = 0; int quant_idx = 0;
public AdpDecoder (int init_sample = 0)
{
prev_sample = init_sample;
}
public void Reset (short s, int q)
{
prev_sample = s;
quant_idx = q;
}
public short DecodeSample (int sample) public short DecodeSample (int sample)
{ {
sample &= 0xF; sample &= 0xF;
@ -103,13 +114,14 @@ namespace GameRes.Formats.Abogado
quant_idx = 0; quant_idx = 0;
else if (quant_idx > 0x58) else if (quant_idx > 0x58)
quant_idx = 0x58; quant_idx = 0x58;
int step = (2 * (sample & 7) + 1) * quant >> 3;
if (sample < 8) if (sample < 8)
{ {
sample = Math.Min (0x7FFF, prev_sample + (((2 * sample + 1) * quant) >> 3)); sample = Math.Min (0x7FFF, prev_sample + step);
} }
else else
{ {
sample = Math.Max (-32768, prev_sample - ((2 * (sample & 7) + 1) * quant >> 3)); sample = Math.Max (-32768, prev_sample - step);
} }
prev_sample = sample; prev_sample = sample;
return (short)sample; return (short)sample;