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add support for spectral extension

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Originally committed as revision 15812 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
2008-11-13 03:18:13 +00:00
parent 0c5d750df9
commit 0cc51734b2
5 changed files with 272 additions and 17 deletions
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46
libavcodec/ac3dec_data.c
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@@ -1127,6 +1127,52 @@ const uint8_t ff_eac3_frm_expstr[32][6] = {
const uint8_t ff_eac3_default_cpl_band_struct[18] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 };
/**
* Table E2.15 Default Spectral Extension Banding Structure
*/
const uint8_t ff_eac3_default_spx_band_struct[17] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };
/**
* Table E.25: Spectral Extension Attenuation Table
* 24-bit fixed-point version of the floating-point table in the specification.
* ff_eac3_spx_atten_tab[code][bin]=lrint(pow(1<<(bin+1),(code+1)/-15.0)*(1<<23));
*/
const int32_t ff_eac3_spx_atten_tab[32][3] = {
{ 8009792, 7648083, 7302707 },
{ 7648083, 6972929, 6357376 },
{ 7302707, 6357376, 5534417 },
{ 6972929, 5796163, 4817990 },
{ 6658043, 5284492, 4194304 },
{ 6357376, 4817990, 3651354 },
{ 6070287, 4392670, 3178688 },
{ 5796163, 4004896, 2767209 },
{ 5534417, 3651354, 2408995 },
{ 5284492, 3329021, 2097152 },
{ 5045853, 3035144, 1825677 },
{ 4817990, 2767209, 1589344 },
{ 4600417, 2522926, 1383604 },
{ 4392670, 2300209, 1204498 },
{ 4194304, 2097152, 1048576 },
{ 4004896, 1912021, 912838 },
{ 3824041, 1743232, 794672 },
{ 3651354, 1589344, 691802 },
{ 3486464, 1449041, 602249 },
{ 3329021, 1321123, 524288 },
{ 3178688, 1204498, 456419 },
{ 3035144, 1098167, 397336 },
{ 2898081, 1001224, 345901 },
{ 2767209, 912838, 301124 },
{ 2642246, 832255, 262144 },
{ 2522926, 758786, 228210 },
{ 2408995, 691802, 198668 },
{ 2300209, 630732, 172951 },
{ 2196335, 575052, 150562 },
{ 2097152, 524288, 131072 },
{ 2002448, 478005, 114105 },
{ 1912021, 435808, 99334 }
};
/**
* Table of bin locations for rematrixing bands
* reference: Section 7.5.2 Rematrixing : Frequency Band Definitions