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>
9 years ago · 4c5136a48b
parent 6e5dbe7267
commit 4c5136a48b
2 changed files with 2 additions and 2 deletions
--- a/libavcodec/aacenc_ltp.c
+++ b/libavcodec/aacenc_ltp.c
@ -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]) {
--- a/tests/fate/aac.mak
+++ b/tests/fate/aac.mak
@ -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