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aacdec: use a scale of 2 in the LTP MDCT rather than doubling the coefficient 

table values from the spec.
This commit is contained in:
Justin Ruggles 2011-04-26 15:30:19 -04:00
parent d70fa4c423
commit 6271794041
2 changed files with 4 additions and 4 deletions
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2
libavcodec/aacdec.c
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@ -593,7 +593,7 @@ static av_cold int aac_decode_init(AVCodecContext *avctx)
ff_mdct_init(&ac->mdct, 11, 1, 1.0);
ff_mdct_init(&ac->mdct_small, 8, 1, 1.0);
ff_mdct_init(&ac->mdct_ltp, 11, 0, 1.0);
ff_mdct_init(&ac->mdct_ltp, 11, 0, 2.0);
// window initialization
ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);

6
libavcodec/aacdectab.h
View File

@ -36,11 +36,11 @@
#include <stdint.h>
/* @name ltp_coef
* Table of the LTP coefficient (multiplied by 2)
* Table of the LTP coefficients
*/
static const float ltp_coef[8] = {
1.141658, 1.393232, 1.626008, 1.822608,
1.969800, 2.135788, 2.2389202, 2.739066,
0.570829, 0.696616, 0.813004, 0.911304,
0.984900, 1.067894, 1.194601, 1.369533,
};
/* @name tns_tmp2_map