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Difference between revisions of "User:Buddha^/GSoC2007-ProjectDiary"
User:Buddha^/GSoC2007-ProjectDiary (view source)
Revision as of 08:42, 18 August 2007
, 08:42, 18 August 2007Added info on done work on 2007-08-14 - 2007-08-17.
(Added info on done work on 2007-08-13.) |
(Added info on done work on 2007-08-14 - 2007-08-17.) |
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is next monday, on the 20th. That hadn't really sunk in yet in my mind so this means | is next monday, on the 20th. That hadn't really sunk in yet in my mind so this means | ||
this week's going to include lots of ScummVM hacking :). | this week's going to include lots of ScummVM hacking :). | ||
== 2007-08-14 (Tuesday) - General Apple IIGS sound hacking #1 == | |||
Worked on the Apple IIGS sound code. | |||
== 2007-08-15 (Wednesday) - General Apple IIGS sound hacking #2 == | |||
More work on the Apple IIGS sound code. | |||
== 2007-08-16 (Thursday) - Inspecting Apple IIGS MIDI sound resources == | |||
Played around with the Apple IIGS AGI midi sound resources. Yep, they're | |||
standard MIDI files with a 16-bit little endian 0x0002 header. Sometimes they | |||
start with 0xFC (Stop sequence) right after the header with no encoded delta-time | |||
before the command. And sometimes they end by simply exhausting the midi stream's | |||
length and not giving a 0xFC (Although it might be just that I'm not parsing the | |||
files 100% correctly yet and that's what's making it happen). Also some of the | |||
midi streams seem to have additional data after the first encountered 0xFC. I | |||
looked at the additional trailing data from some of the files and at a first | |||
glance it seems they're full of commands for centering the pitch wheel on different | |||
channels, setting some default values for different controllers or something like that. | |||
Here are some statistics about the Apple IIGS AGI midi sound resources I tested: | |||
* Used commands in the Apple IIGS AGI midi resources (Approximate counts): | |||
** 0x80: 00064488 "Note off" (Varying parameters) | |||
** 0x90: 00065516 "Note on" (Varying parameters) | |||
** 0xB0: 00006252 "Controller" (Varying parameters) | |||
** 0xC0: 00001574 "Program Change" (Varying parameters) | |||
** 0xE0: 00000146 "Pitch Wheel" (Only used with parameter 0x2000 i.e. wheel center) | |||
** 0xFC: 00000271 "Stop sequence" (No parameters for this, ends the stream) | |||
== 2007-08-17 (Friday) - First Apple IIGS sample playing! == | |||
Got an experimental and not-pretty sound mixing code to run and heard the first | |||
Apple IIGS sample playing at a near reasonable pitch too :-). Whee! Getting something | |||
concrete done raises the spirit! Had some red wine and blue cheese for | |||
celebration :-). | |||