[ scummvm-Patches-615745 ] GMD tracks through IMuseAdlib

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Patches item #615745, was opened at 2002-09-27 19:12
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Jamieson Christian (jamieson630)
Assigned to: Nobody/Anonymous (nobody)
Summary: GMD tracks through IMuseAdlib

Initial Comment:
This patch augments IMuseAdlib with support for playing 
GMD (General MIDI) tracks using Adlib output.

Some notes:

* GMD tracks are now given a comparison priority even if 
_use_adlib is true. This allows GMD tracks to be 
selected in the absence of ADL (Adlib) tracks, where 
previously no track was selected at all.

* A table mapping GM programs to FM instrument 
definitions has been dropped into imuse.cpp. This table 
was built by matching up DOTT instrument definitions 
with GM program changes. While is still has gaps, it 
has been verified to provide reasonable output with the 
whole of DOTT and the Sam & Max demo.

* Program change messages cause IMuseAdlib to use 
the _glob_instr table ONLY if it has determined that 
anything was ever loaded into it (through SysEx 
command 0x11). Otherwise, it draws off the GM-to-FM 
mapping table.


Some attention areas:

* Percussion is not implemented. If IMuseAdlib detects 
anything coming in on the percussion channel, it throws 
it out. NOTE that this may actually be too 
indiscriminatory, i.e. actual Adlib tracks don't have a 
predefined percussion track and may use that channel 
legitimately. Probably need a way for IMuseAdlib to 
determine if it's a GM or Adlib track and filter channels 
accordingly. I didn't notice it kicking out Adlib parts, but 
I'm not certain that it NEVER does that.

* The mapping table currently provides definitions for 
about 70 out of 128 possible programs. If you want to 
help in making it complete, run ScummVM with Sam & 
Max full version, using debug level 2, and capture the 
output and send it to me. Program changes recorded in 
the debug output will tell me which programs are being 
used that are not implemented yet.


Hope this helps bring Sam & Max to life on those Linux 
systems! :-)

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=418822&aid=615745&group_id=37116