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ks1064: Identify the correct decompression table [windyfairy]

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This commit is contained in:
Olivier Galibert 2023-09-19 09:53:11 +02:00
parent 1d08263d67
commit 17a84d11ad
2 changed files with 41 additions and 14 deletions
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51
src/devices/sound/ks0164.cpp
View File

@ -9,6 +9,43 @@
DEFINE_DEVICE_TYPE(KS0164, ks0164_device, "ks0164", "Samsung KS0164 Wavetable Synthesizer")
// Picked up from vrender0
const u16 ks0164_device::sample_dec[0x100]=
{
0x8000, 0x8400, 0x8800, 0x8c00, 0x9000, 0x9400, 0x9800, 0x9c00,
0xa000, 0xa400, 0xa800, 0xac00, 0xb000, 0xb400, 0xb800, 0xbc00,
0x4000, 0x4400, 0x4800, 0x4c00, 0x5000, 0x5400, 0x5800, 0x5c00,
0x6000, 0x6400, 0x6800, 0x6c00, 0x7000, 0x7400, 0x7800, 0x7c00,
0xc000, 0xc200, 0xc400, 0xc600, 0xc800, 0xca00, 0xcc00, 0xce00,
0xd000, 0xd200, 0xd400, 0xd600, 0xd800, 0xda00, 0xdc00, 0xde00,
0x2000, 0x2200, 0x2400, 0x2600, 0x2800, 0x2a00, 0x2c00, 0x2e00,
0x3000, 0x3200, 0x3400, 0x3600, 0x3800, 0x3a00, 0x3c00, 0x3e00,
0xe000, 0xe100, 0xe200, 0xe300, 0xe400, 0xe500, 0xe600, 0xe700,
0xe800, 0xe900, 0xea00, 0xeb00, 0xec00, 0xed00, 0xee00, 0xef00,
0x1000, 0x1100, 0x1200, 0x1300, 0x1400, 0x1500, 0x1600, 0x1700,
0x1800, 0x1900, 0x1a00, 0x1b00, 0x1c00, 0x1d00, 0x1e00, 0x1f00,
0xf000, 0xf080, 0xf100, 0xf180, 0xf200, 0xf280, 0xf300, 0xf380,
0xf400, 0xf480, 0xf500, 0xf580, 0xf600, 0xf680, 0xf700, 0xf780,
0x0800, 0x0880, 0x0900, 0x0980, 0x0a00, 0x0a80, 0x0b00, 0x0b80,
0x0c00, 0x0c80, 0x0d00, 0x0d80, 0x0e00, 0x0e80, 0x0f00, 0x0f80,
0xf800, 0xf840, 0xf880, 0xf8c0, 0xf900, 0xf940, 0xf980, 0xf9c0,
0xfa00, 0xfa40, 0xfa80, 0xfac0, 0xfb00, 0xfb40, 0xfb80, 0xfbc0,
0x0400, 0x0440, 0x0480, 0x04c0, 0x0500, 0x0540, 0x0580, 0x05c0,
0x0600, 0x0640, 0x0680, 0x06c0, 0x0700, 0x0740, 0x0780, 0x07c0,
0xfc00, 0xfc20, 0xfc40, 0xfc60, 0xfc80, 0xfca0, 0xfcc0, 0xfce0,
0xfd00, 0xfd20, 0xfd40, 0xfd60, 0xfd80, 0xfda0, 0xfdc0, 0xfde0,
0x0200, 0x0220, 0x0240, 0x0260, 0x0280, 0x02a0, 0x02c0, 0x02e0,
0x0300, 0x0320, 0x0340, 0x0360, 0x0380, 0x03a0, 0x03c0, 0x03e0,
0xfe00, 0xfe10, 0xfe20, 0xfe30, 0xfe40, 0xfe50, 0xfe60, 0xfe70,
0xfe80, 0xfe90, 0xfea0, 0xfeb0, 0xfec0, 0xfed0, 0xfee0, 0xfef0,
0x0100, 0x0110, 0x0120, 0x0130, 0x0140, 0x0150, 0x0160, 0x0170,
0x0180, 0x0190, 0x01a0, 0x01b0, 0x01c0, 0x01d0, 0x01e0, 0x01f0,
0x0000, 0x0008, 0x0010, 0x0018, 0x0020, 0x0028, 0x0030, 0x0038,
0x0040, 0x0048, 0x0050, 0x0058, 0x0060, 0x0068, 0x0070, 0x0078,
0xff80, 0xff88, 0xff90, 0xff98, 0xffa0, 0xffa8, 0xffb0, 0xffb8,
0xffc0, 0xffc8, 0xffd0, 0xffd8, 0xffe0, 0xffe8, 0xfff0, 0xfff8,
};
ks0164_device::ks0164_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, KS0164, tag, owner, clock),
device_sound_interface(mconfig, *this),
@ -413,16 +450,6 @@ void ks0164_device::cpu_map(address_map &map)
map(0xe000, 0xffff).ram();
}
u16 ks0164_device::uncomp_8_16(u8 value)
{
int xp = value >> 5;
s16 o = (0x10 | (value & 0xf)) << 10;
o = o >> xp;
if(value & 0x10)
o = -o;
return o;
}
void ks0164_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
for(int sample = 0; sample != outputs[0].samples(); sample++) {
@ -445,8 +472,8 @@ void ks0164_device::sound_stream_update(sound_stream &stream, std::vector<read_s
break;
case 0x8400: // 8 bits compressed
samp0 = uncomp_8_16(m_mem_cache.read_byte(adr));
samp1 = uncomp_8_16(m_mem_cache.read_byte(adr+1));
samp0 = sample_dec[m_mem_cache.read_byte(adr)];
samp1 = sample_dec[m_mem_cache.read_byte(adr+1)];
break;
default:

4
src/devices/sound/ks0164.h
View File

@ -46,6 +46,8 @@ private:
MPUS_RX_INT = 0x80
};
static const u16 sample_dec[0x100];
devcb_write_line m_midi_tx;
optional_memory_region m_mem_region;
@ -106,8 +108,6 @@ private:
void midi_w(u8 data);
u8 midi_status_r();
void midi_status_w(u8 data);
static inline u16 uncomp_8_16(u8 value);
};
DECLARE_DEVICE_TYPE(KS0164, ks0164_device)