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Difference between revisions of "User:Buddha^/GSoC2007-ProjectDiary"
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User:Buddha^/GSoC2007-ProjectDiary (view source)
Revision as of 12:46, 30 August 2007
, 12:46, 30 August 2007Added info on SIERRASTANDARD's samples.
(Update to used commands in Apple IIGS AGI midi resources (Correction).) |
(Added info on SIERRASTANDARD's samples.) |
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As a sidenote program 17 seems ok but for some reason it seems not to be used | As a sidenote program 17 seems ok but for some reason it seems not to be used | ||
at all. Maybe just not a particularly popular instrument?-) | at all. Maybe just not a particularly popular instrument?-) | ||
== 2007-08-30 (Thursday) - SIERRASTANDARD investigation etc == | |||
The Apple IIGS AGI uses a file named SIERRASTANDARD that holds | |||
the sample data used by the instruments. It's 65536 bytes in size, | |||
it holds 8-bit unsigned sample data and all the different samples | |||
start on 256 byte boundaries. None of the SIERRASTANDARD files I've | |||
tested have zeroes in them (A zero would mark a premature end of a sample). | |||
After some investigation (Looking at the file rawly imported into Audacity) etc | |||
here's some info on it (This info applies directly to the newer SIERRASTANDARD | |||
file used with Apple IIGS AGI v1.003+. There are some little differences in | |||
the older SIERRASTANDARD file that's used at least with Space Quest I (AGI v1.002)): | |||
* Number of samples (Not all unique!): | |||
** 34 | |||
* Sample sizes log2 (2**x will give the true sample size): | |||
** sampleSizesLog2 = [10, 10, 10, 9, 9, 10, 10, 10, 10, 10, 10, 11, 10, 10, 10, 10, 10, 10, 11, 10, 10, 11, 10, 10, 11, 10, 10, 11, 14, 13, 11, 11, 11, 11] | |||
* Sample sizes (This table can be calculated from the sample sizes log2): | |||
** sampleSizes = [1024, 1024, 1024, 512, 512, 1024, 1024, 1024, 1024, 1024, 1024, 2048, 1024, 1024, 1024, 1024, 1024, 1024, 2048, 1024, 1024, 2048, 1024, 1024, 2048, 1024, 1024, 2048, 16384, 8192, 2048, 2048, 2048, 2048] | |||
*** Way to calculate this with Python: sampleSizes = map(lambda x: 2**x, sampleSizesLog2) | |||
*** Note that sum(sampleSizes) should always be 65536 (The size of SIERRASTANDARD) | |||
* Sample positions (This table can be calculated from the sample sizes): | |||
** samplePos = [0, 1024, 2048, 3072, 3584, 4096, 5120, 6144, 7168, 8192, 9216, 10240, 12288, 13312, 14336, 15360, 16384, 17408, 18432, 20480, 21504, 22528, 24576, 25600, 26624, 28672, 29696, 30720, 32768, 49152, 57344, 59392, 61440, 63488] | |||
*** Way to calculate this with Python: samplePos = [sum(sampleSizes[:end]) for end in xrange(len(sampleSizes))] | |||