Database
aa1197.txt
Associated article: Algorithm Alley
Tags: Database
Source code accompanying the article by Tim Kientzle in which he goes inside the IMA ADPCM audio compression format and examines how it is implemented by Microsoft and Apple. Also see AA1197.ZIP.
Algorithm Alley
by Tim Kientzle
Example 1:
static const int _stepSizeTable[89] = {
7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34,
37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143,
157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408, 449, 494,
544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282, 1411, 1552,
1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660, 4026,
4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442,
11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623,
27086, 29794, 32767
};
Example 2:
static const int indexAdjustTable[16] = {
-1, -1, -1, -1, // +0 - +3, decrease the step size
2, 4, 6, 8, // +4 - +7, increase the step size
-1, -1, -1, -1, // -0 - -3, decrease the step size
2, 4, 6, 8, // ...
