Difference between revisions of "LVGM"
From MSX Game Library
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Not used: B5-B7, BD-BF | Not used: B5-B7, BD-BF | ||
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Latest revision as of 01:06, 31 March 2024
Last version can see on GitHub.
============================================================================== HEADER (4 bytes) ============================================================================== xx[4] "lVGM" Light-VGM identifier xx Options 7 6 5 4 3 2 1 0 │ │ │ │ │ │ └── Frequency (0: 60 Hz, 1: 50 Hz) │ │ │ │ │ └──── Loop data included │ │ │ │ └────── Devices (0: PSG only, 1: Device list incuded; see bellow) └─┴─┴─┴────────── File format version (0) (xx) Devices (only present if Options#2 is 1) 7 6 5 4 3 2 1 0 │ │ │ │ │ │ └── Include PSG data (AY-3-8910) │ │ │ │ │ └──── Include MSX-MUSIC data (YM2413/OPLL) │ │ │ │ └────── Include MSX-AUDIO data (Y8950/OPL1+ADPCM) │ │ │ └──────── Include SCC data (K051649) │ │ └────────── Include SCC+ data (K052539) │ └──────────── Include secondary PSG data └──────────────── Include Moonsound data (YMF278/OPL4) (xx) PSG - Most common value (only present if Opions#2 is 0 or Devices#0 is 1) ============================================================================== COMMON DATA (E0~FF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ En Wait n+1 cycles (1~16) .............................................................................. F0 Start of PSG chunk (default when not defined) F1 Start of MSX-MUSIC chunk F2 Start of MSX-AUDIO chunk F3 Start of SCC chunk F4 Start of SCC+ chunk F5 Start of secondary PSG chunk F7 Start of Moonsound chunk FD nn Special markers (trigger notification by the replayer) 00 End of data segment .. 7F ............... Replayer ony notification (not incuded in data) 80 .. FE Reach loop marker FF Jump to loop marker FE Loop position FF End of song .............................................................................. Not used: F6, F8~FC ============================================================================== PSG DATA (00~DF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ 00 xx Tone Period (R#0 = xx) 1x Tone Period (R#1 = x) 02 xx Tone Period (R#2 = xx) 2x Tone Period (R#3 = x) 04 xx Tone Period (R#4 = xx) 3x Tone Period (R#5 = x) 4x Noise Period (R#6 = x) 5x Noise Period (R#6 = x | 0x10) 07 xx Mixer (R#7 = x) 6x Tone Amplitude (R#8 = x) 7x Tone Amplitude (R#8 = x | 0x10) 8x Tone Amplitude (R#9 = x) 9x Tone Amplitude (R#9 = x | 0x10) Ax Tone Amplitude (R#10 = x) Bx Tone Amplitude (R#10 = x | 0x10) 0B xx Envelope Period (R#11 = xx) 0C xx Envelope Period (R#12 = xx) Cx Envelope Shape (R#13 = x) .............................................................................. Dx More common byte value (R#x = <Most common value>) .............................................................................. Not used: 01, 03, 05, 06, 08, 09, 0A, 0D~0F, DE~DF ============================================================================== MSX-MUSIC DATA (00~DF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ xx yy R#xx = yy (xx ∈ [00:38]) xx|80 R#xx = 0 (xx ∈ [80:B8]) .............................................................................. 40 xx[8] User Tone (copy 8 bytes from R#0) 50 xx User Tone (fill 8 bytes from R#0) 41 xx[9] F-Number (copy 9 bytes from R#10) 51 xx F-Number (fill 9 bytes from R#10) 42 xx[9] Setting (copy 9 bytes from R#20) 52 xx Setting (fill 9 bytes from R#20) 43 xx[9] Inst/col (copy 9 bytes from R#30) 53 xx Inst/col (fill 9 bytes from R#30) .............................................................................. 44 xx[3] Rhythm F-Number (copy 3 bytes from R#16) 54 xx Rhythm F-Number (fill 3 bytes from R#16) 45 xx[3] Rhythm Setting (copy 3 bytes from R#26) 55 xx Rhythm Setting (fill 3 bytes from R#26) 46 xx[3] Rhythm Inst/col (copy 3 bytes from R#36) 56 xx Rhythm Inst/col (fill 3 bytes from R#36) .............................................................................. 6x yy zz Set x+3 bytes (3~18) start from R#yy 7x yy zz[] Copy x+3 bytes (3~18) start from R#yy .............................................................................. Not used: 08~0D, 19~1F, 29~2F, 39~3F, 47~4F, 57~5F, 88~8D, 99~9F, A9~AF, B9~DF ============================================================================== MSX-AUDIO DATA (00~DF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ xx yy R#xx = yy (xx ∈ [00:C8]) .............................................................................. 1F xx[8] User Tone 1 (copy 8 bytes in 20,23,40,43,60,63,80,83) 2F xx[8] User Tone 2 (copy 8 bytes in 21,24,41,44,61,64,81,84) 3F xx[8] User Tone 3 (copy 8 bytes in 22,25,42,45,62,65,82,85) 4F xx[8] User Tone 4 (copy 8 bytes in 28,2B,48,4B,68,6B,88,8B) 5F xx[8] User Tone 5 (copy 8 bytes in 29,2C,49,4C,69,6C,89,8C) 6F xx[8] User Tone 6 (copy 8 bytes in 2A,2D,4A,4D,6A,6D,8A,8D) 7F xx[8] User Tone 7 (copy 8 bytes in 30,33,50,53,70,73,90,93) 8F xx[8] User Tone 8 (copy 8 bytes in 31,34,51,54,71,74,91,94) 9F xx[8] User Tone 9 (copy 8 bytes in 32,35,52,55,72,75,92,95) .............................................................................. Dx yy zz[] Copy x+3 bytes (3~18) start from R#yy .............................................................................. Not used: 13~14, 1B~1E, 26~27, 2E, 36~3E, 46~47, 4E, 56~5E, 66~67, 6E, 76~7E, 86~87, 8E, 96~9E, A9~AF, B9~BC, BE~BF, C9~CF ============================================================================== SCC/SCC+ DATA (00~DF) ============================================================================== Opcode Action SCC SCC+ ------------------------------------------------------------------------------ xx yy R#xx = yy (xx ∈ [00:AF]) 9800 B800 .............................................................................. B0 xx[32] Copy 32 bytes to channel 1 waveform 9800 B800 B1 xx[32] Copy 32 bytes to channel 2 waveform 9820 B820 B2 xx[32] Copy 32 bytes to channel 3 waveform 9840 B840 B3 xx[32] Copy 32 bytes to channel 4 waveform 9860 B860 B4 xx[32] Copy 32 bytes to channel 5 waveform B880 B8 xx Set 32 bytes to channel 1 waveform 9800 B800 B9 xx Set 32 bytes to channel 2 waveform 9820 B820 BA xx Set 32 bytes to channel 3 waveform 9840 B840 BB xx Set 32 bytes to channel 4 waveform 9860 B860 BC xx Set 32 bytes to channel 5 waveform B880 .............................................................................. Cx yy zz Set x+3 bytes (3~18) start from R#yy Dx yy zz[] Copy x+3 bytes (3~18) start from R#yy .............................................................................. Not used: B5-B7, BD-BF