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Adjust the splitting threshold.

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Previously, we would only split a band if it was allocated more than
 32 bits.
However, the N=4 codebook can only produce about 22.5 bits, and two
 N=2 bands combined can only produce 26 bits, including 8 bits for
 qtheta, so if we wait until we allocate 32, we're guaranteed to fall
 short.
Several of the larger bands come pretty far from filling 32 bits as
 well, though their split versions will.

Greg Maxwell also suggested adding an offset to the threshold to
 account for the inefficiency of using qtheta compared to another
 VQ dimension.
This patch uses 1 bit as a placeholder, as it's a clear
 improvement, but we may adjust this later after collecting data on
 more possibilities over more files.
This commit is contained in:
Timothy B. Terriberry 2011-01-31 10:44:03 -08:00 • committed by Jean-Marc Valin
parent 5cf41c9d1f
commit 4499263b44
4 changed files with 12 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

2
libcelt/static_modes_float.c
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@ -22,7 +22,7 @@ static const celt_int16 cache_index50[105] = {
static const unsigned char cache_bits50[392] = {
40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28, 31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50, 51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65, 66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61, 64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92, 94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123, 124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94, 97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139, 142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35, 28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149, 153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225, 229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157, 166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63, 86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250, 25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180, 185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89, 110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41, 74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138, 163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214, 228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49, 90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47, 87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57, 106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187, 224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127, 182, 234, };
static const unsigned char cache_caps50[168] = {
18, 18, 18, 18, 18, 18, 18, 18, 28, 28, 28, 28, 55, 55, 55, 90, 90, 116, 148, 141, 139, 18, 18, 18, 18, 18, 18, 18, 18, 38, 38, 38, 38, 62, 62, 62, 98, 98, 123, 156, 146, 144, 14, 14, 14, 14, 14, 14, 14, 14, 27, 27, 27, 27, 58, 58, 58, 92, 92, 118, 151, 144, 141, 19, 19, 19, 19, 19, 19, 19, 19, 31, 31, 31, 31, 61, 61, 61, 96, 96, 122, 155, 147, 143, 13, 13, 13, 13, 13, 13, 13, 13, 29, 29, 29, 29, 59, 59, 59, 92, 92, 118, 152, 145, 142, 15, 15, 15, 15, 15, 15, 15, 15, 30, 30, 30, 30, 61, 61, 61, 94, 94, 120, 153, 147, 143, 14, 14, 14, 14, 14, 14, 14, 14, 29, 29, 29, 29, 59, 59, 59, 93, 93, 118, 152, 145, 142, 15, 15, 15, 15, 15, 15, 15, 15, 30, 30, 30, 30, 60, 60, 60, 94, 94, 119, 153, 146, 143, };
18, 18, 18, 18, 18, 18, 18, 18, 28, 28, 28, 28, 62, 62, 62, 90, 90, 116, 148, 141, 139, 18, 18, 18, 18, 18, 18, 18, 18, 38, 38, 38, 38, 67, 67, 67, 98, 98, 123, 156, 146, 144, 14, 14, 14, 14, 14, 14, 14, 14, 31, 31, 31, 31, 64, 64, 64, 92, 92, 118, 151, 144, 141, 19, 19, 19, 19, 19, 19, 19, 19, 33, 33, 33, 33, 67, 67, 67, 96, 96, 122, 155, 147, 143, 15, 15, 15, 15, 15, 15, 15, 15, 32, 32, 32, 32, 64, 64, 64, 92, 92, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 66, 66, 66, 94, 94, 120, 153, 147, 143, 16, 16, 16, 16, 16, 16, 16, 16, 32, 32, 32, 32, 64, 64, 64, 93, 93, 118, 152, 145, 142, 16, 16, 16, 16, 16, 16, 16, 16, 33, 33, 33, 33, 65, 65, 65, 94, 94, 119, 153, 146, 143, };
#endif
#ifndef FFT_TWIDDLES48000_960