[FFmpeg-cvslog] aacenc_ltp: disable LTP with high lambda values

[Rostislav Pehlivanov]

ffmpeg | branch: master | Rostislav Pehlivanov <atomnuker at gmail.com> | Tue Dec  8 13:24:48 2015 +0000| [4c5136a48ba8beb7737a0b67d4d4f64add1263a9] | committer: Rostislav Pehlivanov

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 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4c5136a48ba8beb7737a0b67d4d4f64add1263a9
---

 libavcodec/aacenc_ltp.c |    2 +-
 tests/fate/aac.mak      |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/aacenc_ltp.c b/libavcodec/aacenc_ltp.c
index 1917ee9..b9d43b4 100644
--- 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]) {
diff --git a/tests/fate/aac.mak b/tests/fate/aac.mak
index 816fbf0..4e55b76 100644
--- 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