diff options
| -rw-r--r-- | src/adlmidi_opl3.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/src/adlmidi_opl3.cpp b/src/adlmidi_opl3.cpp index 9920ab8..1a45b83 100644 --- a/src/adlmidi_opl3.cpp +++ b/src/adlmidi_opl3.cpp @@ -523,7 +523,8 @@ void OPL3::touchNote(size_t c, default: case Synth::VOLUME_Generic: { - volume = velocity * m_masterVolume * channelVolume * channelExpression; + volume = velocity * m_masterVolume * + channelVolume * channelExpression; /* If the channel has arpeggio, the effective volume of * *this* instrument is actually lower due to timesharing. @@ -533,9 +534,18 @@ void OPL3::touchNote(size_t c, * increment sounds wrong. Therefore, using the square root. */ //volume = (int)(volume * std::sqrt( (double) ch[c].users.size() )); + const double c1 = 11.541560327111707; + const double c2 = 1.601379199767093e+02; + uint_fast32_t minVolume = 8725 * 127; // The formula below: SOLVE(V=127^4 * 2^( (A-63.49999) / 8), A) - volume = volume > (8725 * 127) ? static_cast<uint_fast32_t>(std::log(static_cast<double>(volume)) * 11.541560327111707 - 1.601379199767093e+02) : 0; + if(volume > minVolume) + { + double lv = std::log(static_cast<double>(volume)); + volume = static_cast<uint_fast32_t>(lv * c1 - c2); + } + else + volume = 0; // The incorrect formula below: SOLVE(V=127^4 * (2^(A/63)-1), A) //opl.Touch_Real(c, volume>(11210*127) ? 91.61112 * std::log((4.8819E-7/127)*volume + 1.0)+0.5 : 0); } @@ -544,7 +554,7 @@ void OPL3::touchNote(size_t c, case Synth::VOLUME_NATIVE: { volume = velocity * channelVolume * channelExpression; - // volume = volume * m_masterVolume / (127 * 127 * 127) / 2; + // 4096766 = (127 * 127 * 127) / 2 volume = (volume * m_masterVolume) / 4096766; } break; @@ -561,15 +571,13 @@ void OPL3::touchNote(size_t c, { volume = (channelVolume * channelExpression * m_masterVolume / 16129); volume = ((64 * (velocity + 0x80)) * volume) >> 15; - //volume = ((63 * (velocity + 0x80)) * Ch[MidCh].volume) >> 15; } break; case Synth::VOLUME_9X: { - //volume = 63 - W9X_volume_mapping_table[(((velocity * Ch[MidCh].volume /** Ch[MidCh].expression*/) * m_masterVolume / 16129 /*2048383*/) >> 2)]; - volume = 63 - W9X_volume_mapping_table[((velocity * channelVolume * channelExpression * m_masterVolume / 2048383) >> 2)]; - //volume = W9X_volume_mapping_table[vol >> 2] + volume; + volume = velocity * channelVolume * channelExpression * m_masterVolume; + volume = 63 - W9X_volume_mapping_table[(volume / 2048383) >> 2]; } break; } |