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| author | Rostislav Pehlivanov <atomnuker@gmail.com> | 2015-09-06 18:36:42 +0100 |
|---|---|---|
| committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2015-09-06 18:36:42 +0100 |
| commit | 1956cfbaedd364b30095e956fc881f7eaa1e21ff (patch) | |
| tree | 19af9c6d74dc89c57d1164097929534f3a09199d /libavcodec | |
| parent | ff99a388557480ac32fdf924c4f2f16a3cabfe0a (diff) | |
| download | ffmpeg-1956cfbaedd364b30095e956fc881f7eaa1e21ff.tar.gz | |
aacenc_is: take absolute coefficient value upon energy calculations
This was an oversight when the IS system was being first implemented.
The ener01 part was largely a result of trial and error and the fact
that the sum of coef0 and coef1 could result in a zero was
overlooked. Once ener01 turns to zero it's used to divide the left
channel energy which doesn't turn out so well as it fills IS[]
with -nan's and inf's which in turn confused the quantize_band_cost.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/aacenc_is.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/aacenc_is.c b/libavcodec/aacenc_is.c index 95ba3f8d50..e983b7548f 100644 --- a/libavcodec/aacenc_is.c +++ b/libavcodec/aacenc_is.c @@ -114,8 +114,8 @@ void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElemen } for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) { for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { - float coef0 = sce0->pcoeffs[start+(w+w2)*128+i]; - float coef1 = sce1->pcoeffs[start+(w+w2)*128+i]; + float coef0 = fabsf(sce0->pcoeffs[start+(w+w2)*128+i]); + float coef1 = fabsf(sce1->pcoeffs[start+(w+w2)*128+i]); ener0 += coef0*coef0; ener1 += coef1*coef1; ener01 += (coef0 + coef1)*(coef0 + coef1); |