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| === Sound === | | === Sound === |
| * Sound - [http://qmt.ath.cx/~quietust/scumm/maniac/music.txt] | | * Still need to link in an NES APU module to get sound output; otherwise, Player_NES is complete. |
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| Sound Format:
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| uint16 length (added by extract util)
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| uint8 slot - specifies which slot the sound plays in - 2 for music, 0/1/4 for sound effects
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| - slot 4 sound effects appear to play in slot 0, but only if no music is playing?
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| uint8 type - 10 (0x0A) for sound effects, 100 (0x64) for music
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| uint8 data[]
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| Type 10 data:
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| [03/07/0B/0F] - next 4 bytes is data for sound channel 0/1/2/3 (square1, square2, triangle, noise)
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| [10] - next byte is a number of frames to wait before processing the next update
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| [FE] - loop back to beginning
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| [FF] - terminate sound
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| Type 100 data:
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| uint8 auxLen - specifies length of auxiliary data blocks
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| uint8 noteInstrs[auxLen] - Specifies the instrument of each predefined note
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| uint8 noteFreqs[auxLen] - Specifies the pitch of each predefined note
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| uint8 music[]:
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| 00 thru (auxLen-1) - start playing a note using the specified instrument at the specified pitch
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| auxLen thru (auxLen+15) - update the note playing in the specified instrument (?)
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| (auxLen+16) thru 0xFF - delay N-auxLen-16 frames before parsing next byte
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| [FE] - loop back to beginning
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| [FF] - terminate sound
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| There are a total of 16 instruments, spread out over the 4 NES sound channels using the following mapping:
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| A total of 28 commands exist within the sound engine, each tied to one or more instruments.
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| Sound channels: (00 = square A, 01 = square B, 02 = triangle, 03 = noise)
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| * 00 00 00 00 00 00 00 01 01 01 02 02 01 03 03 03
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| Start commands:
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| * 05 03 06 08 0B 01 01 1A 16 06 04 17 02 10 0E 0D
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| Update (?) commands:
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| * 0F 00 00 09 00 14 15 00 00 00 1B 1B 0F 0F 0F 0F
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| To make matters worse, each command automatically chains to another after a set number of frames:
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| 00 -> xx
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| 01 -> xx
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| 02 -> xx
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| 03 -> xx
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| 04 -> 17 (3)
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| 05 -> xx
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| 06 -> 07 (3)
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| 07 -> xx
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| 08 -> xx
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| 09 -> 0A (5)
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| 0A -> 09 (8)
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| 0B -> 0C (3)
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| 0C -> 00 (0?)
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| 0D -> 00 (0?)
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| 0E -> 00 (0)
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| 0F -> 00 (0)
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| 10 -> 11 (2)
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| 11 -> 12 (2)
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| 12 -> 11 (2)
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| 13 -> 03 (0)?
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| 14 -> xx
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| 15 -> xx
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| 16 -> 18 (3)
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| 17 -> 00 (0)?
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| 18 -> 19 (3)
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| 19 -> 00 (0)?
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| 1A -> 00 (0)?
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| 1B -> 00 (0)?
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| Behavior of each command has not yet been determined
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