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ymfm: Play ADPCM-A samples through the end of the end block inclusive

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This commit is contained in:
Aaron Giles 2021-06-22 00:39:32 -07:00
parent 4728cc9c4d
commit 86d1ef2604
1 changed files with 15 additions and 10 deletions
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25
3rdparty/ymfm/src/ymfm_adpcm.cpp vendored
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@ -157,20 +157,25 @@ bool adpcm_a_channel::clock()
return false;
}
// stop when we hit the end address; apparently only low 20 bits are used for
// comparison on the YM2610: this affects sample playback in some games, for
// example twinspri character select screen music will skip some samples if
// this is not correct
if (((m_curaddress ^ (m_regs.ch_end(m_choffs) << m_address_shift)) & 0xfffff) == 0)
{
m_playing = m_accumulator = 0;
return true;
}
// if we're about to read nibble 0, fetch the data
uint8_t data;
if (m_curnibble == 0)
{
// stop when we hit the end address; apparently only low 20 bits are used for
// comparison on the YM2610: this affects sample playback in some games, for
// example twinspri character select screen music will skip some samples if
// this is not correct
//
// note also: end address is inclusive, so wait until we are about to fetch
// the sample just after the end before stopping; this is needed for nitd's
// jump sound, for example
uint32_t end = (m_regs.ch_end(m_choffs) + 1) << m_address_shift;
if (((m_curaddress ^ end) & 0xfffff) == 0)
{
m_playing = m_accumulator = 0;
return true;
}
m_curbyte = m_owner.intf().ymfm_external_read(ACCESS_ADPCM_A, m_curaddress++);
data = m_curbyte >> 4;
m_curnibble = 1;