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aacenc_ltp: disable LTP with high lambda values 

Makes no sense to enable for high bitrates, the coder does well enough.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2015-12-08 13:24:48 +00:00
parent 6e5dbe7267
commit 4c5136a48b
2 changed files with 2 additions and 2 deletions
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2
libavcodec/aacenc_ltp.c
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@ -173,7 +173,7 @@ void ff_aac_search_for_ltp(AACEncContext *s, SingleChannelElement *sce,
return;
}
if (!sce->ics.ltp.lag)
if (!sce->ics.ltp.lag || s->lambda > 120.0f)
return;
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {

2
tests/fate/aac.mak
View File

@ -209,7 +209,7 @@ fate-aac-ltp-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-re
fate-aac-ltp-encode: CMP = stddev
fate-aac-ltp-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
fate-aac-ltp-encode: CMP_SHIFT = -4096
fate-aac-ltp-encode: CMP_TARGET = 1273
fate-aac-ltp-encode: CMP_TARGET = 1270
fate-aac-ltp-encode: SIZE_TOLERANCE = 3560
fate-aac-ltp-encode: FUZZ = 17