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aacenc_tns: use 4 bits for short windows

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With only 7 coefficients per short window at most the extra precision
makes a difference and seems to reduce crackling and stddev even
further.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
pull/164/head
Rostislav Pehlivanov 9 years ago
parent 8142daca44
commit 6e5dbe7267
2 changed files with 2 additions and 2 deletions
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  1. 2
      libavcodec/aacenc_tns.c
  2. 2
      tests/fate/aac.mak

2
libavcodec/aacenc_tns.c
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@ -35,7 +35,7 @@
#define TNS_Q_BITS 4
/* Coefficient resolution in short windows */
#define TNS_Q_BITS_IS8 3
#define TNS_Q_BITS_IS8 4
/* We really need the bits we save here elsewhere */
#define TNS_ENABLE_COEF_COMPRESSION

2
tests/fate/aac.mak
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@ -182,7 +182,7 @@ fate-aac-tns-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-re
fate-aac-tns-encode: CMP = stddev
fate-aac-tns-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
fate-aac-tns-encode: CMP_SHIFT = -4096
fate-aac-tns-encode: CMP_TARGET = 818
fate-aac-tns-encode: CMP_TARGET = 817
fate-aac-tns-encode: FUZZ = 6
fate-aac-tns-encode: SIZE_TOLERANCE = 3560

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