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109 lines
3.4 KiB
109 lines
3.4 KiB
// ToolHelp.cpp : Global functions.
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//
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// Copyright (C) 1999 Microsoft Corporation. All Rights Reserved
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//
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#include "toolhelp.h"
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long CToolHelper::m_slMIDIToDB[128] = { // Global array used to convert MIDI to dB.
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-9600, -8415, -7211, -6506, -6006, -5619, -5302, -5034,
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-4802, -4598, -4415, -4249, -4098, -3959, -3830, -3710,
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-3598, -3493, -3394, -3300, -3211, -3126, -3045, -2968,
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-2894, -2823, -2755, -2689, -2626, -2565, -2506, -2449,
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-2394, -2341, -2289, -2238, -2190, -2142, -2096, -2050,
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-2006, -1964, -1922, -1881, -1841, -1802, -1764, -1726,
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-1690, -1654, -1619, -1584, -1551, -1518, -1485, -1453,
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-1422, -1391, -1361, -1331, -1302, -1273, -1245, -1217,
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-1190, -1163, -1137, -1110, -1085, -1059, -1034, -1010,
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-985, -961, -938, -914, -891, -869, -846, -824,
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-802, -781, -759, -738, -718, -697, -677, -657,
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-637, -617, -598, -579, -560, -541, -522, -504,
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-486, -468, -450, -432, -415, -397, -380, -363,
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-347, -330, -313, -297, -281, -265, -249, -233,
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-218, -202, -187, -172, -157, -142, -127, -113,
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-98, -84, -69, -55, -41, -27, -13, 0
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};
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long CToolHelper::m_slDBToMIDI[97] = { // Global array used to convert db to MIDI.
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127, 119, 113, 106, 100, 95, 89, 84, 80, 75,
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71, 67, 63, 60, 56, 53, 50, 47, 45, 42,
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40, 37, 35, 33, 31, 30, 28, 26, 25, 23,
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22, 21, 20, 19, 17, 16, 15, 15, 14, 13,
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12, 11, 11, 10, 10, 9, 8, 8, 8, 7,
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7, 6, 6, 6, 5, 5, 5, 4, 4, 4,
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4, 3, 3, 3, 3, 3, 2, 2, 2, 2,
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2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0
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};
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long CToolHelper::m_slResTypes[DMUS_TIME_UNIT_COUNT] =
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{ 1, // DMUS_TIME_UNIT_MS
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1, // DMUS_TIME_UNIT_MTIME
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384, // DMUS_TIME_UNIT_GRID
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768, // DMUS_TIME_UNIT_BEAT
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3072, // DMUS_TIME_UNIT_BAR
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32, // DMUS_TIME_UNIT_64T
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48, // DMUS_TIME_UNIT_64
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64, // DMUS_TIME_UNIT_32T
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96, // DMUS_TIME_UNIT_32
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128, // DMUS_TIME_UNIT_16T
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192, // DMUS_TIME_UNIT_16
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256, // DMUS_TIME_UNIT_8T
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384, // DMUS_TIME_UNIT_8
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512, // DMUS_TIME_UNIT_4T
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768, // DMUS_TIME_UNIT_4
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1024, // DMUS_TIME_UNIT_2T
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1536, // DMUS_TIME_UNIT_2
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2048, // DMUS_TIME_UNIT_1T
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3072 // DMUS_TIME_UNIT_1
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};
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BYTE CToolHelper::VolumeToMidi(long lVolume)
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{
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if (lVolume < -9600) lVolume = -9600;
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if (lVolume > 0) lVolume = 0;
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lVolume = -lVolume;
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long lFraction = lVolume % 100;
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lVolume = lVolume / 100;
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long lResult = m_slDBToMIDI[lVolume];
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lResult += ((m_slDBToMIDI[lVolume + 1] - lResult) * lFraction) / 100;
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return (BYTE) lResult;
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}
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long CToolHelper::MidiToVolume(BYTE bMidi)
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{
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if (bMidi > 127) bMidi = 127;
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return m_slMIDIToDB[bMidi];
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}
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long CToolHelper::TimeUnitToTicks(long lTimeUnit,DMUS_TIMESIGNATURE *pTimeSig)
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{
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long lTicks;
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if (lTimeUnit > DMUS_TIME_UNIT_BAR)
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{
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lTicks = m_slResTypes[lTimeUnit];
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}
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else if ((lTimeUnit >= DMUS_TIME_UNIT_GRID) && pTimeSig)
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{
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DWORD dwBeat = (4 * 768) / pTimeSig->bBeat;
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if (lTimeUnit == DMUS_TIME_UNIT_BEAT)
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{
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lTicks = dwBeat;
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}
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else if (lTimeUnit == DMUS_TIME_UNIT_GRID)
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{
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lTicks = (dwBeat / pTimeSig->wGridsPerBeat);
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}
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else
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{
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lTicks = (dwBeat * pTimeSig->bBeatsPerMeasure);
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}
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}
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else lTicks = 0;
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return lTicks;
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}
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