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c140.cpp: Reduce duplication in fetching sample (#7439)

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cam900 2020-11-07 07:00:47 +09:00 committed by GitHub
parent 1b9b9c9509
commit b697d7d9ca
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1 changed files with 2 additions and 1 deletions
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src/devices/sound/c140.cpp
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@ -292,8 +292,9 @@ void c140_device::sound_stream_update(sound_stream &stream, std::vector<read_str
if (cnt)
{
const u16 sample = read_word((sampleData + pos) << 1) & 0xfff0; // 12bit
prevdt = lastdt;
lastdt = ((ch_mulaw(v)) ? m_pcmtbl[read_byte((sampleData + pos) << 1)] : s16(read_word((sampleData + pos) << 1) & 0xfff0)) >> 4; // 12bit
lastdt = ((ch_mulaw(v)) ? m_pcmtbl[(sample >> 8) & 0xff] : s16(sample)) >> 4;
dltdt = (lastdt - prevdt);
}