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AAC encoder: use signed coeffs when measuring IS energy 

I/S energy, especially when it comes to phase cancellations,
needs to use signed coefficients as input, yet it was using
abs'd coefficients. That was a slight bug.
This commit is contained in:
Claudio Freire 2016-01-16 20:47:00 -03:00
parent 60a76f8be8
commit df3fa48288
2 changed files with 3 additions and 3 deletions
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4
libavcodec/aacenc_is.c
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@ -120,8 +120,8 @@ void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElemen
struct AACISError ph_err1, ph_err2, *best;
for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) {
for (i = 0; i < sce0->ics.swb_sizes[g]; i++) {
float coef0 = fabsf(sce0->coeffs[start+(w+w2)*128+i]);
float coef1 = fabsf(sce1->coeffs[start+(w+w2)*128+i]);
float coef0 = sce0->coeffs[start+(w+w2)*128+i];
float coef1 = sce1->coeffs[start+(w+w2)*128+i];
ener0 += coef0*coef0;
ener1 += coef1*coef1;
ener01 += (coef0 + coef1)*(coef0 + coef1);

2
tests/fate/aac.mak
View File

@ -191,7 +191,7 @@ fate-aac-is-encode: CMD = enc_dec_pcm adts wav s16le $(TARGET_SAMPLES)/audio-ref
fate-aac-is-encode: CMP = stddev
fate-aac-is-encode: REF = $(SAMPLES)/audio-reference/luckynight_2ch_44kHz_s16.wav
fate-aac-is-encode: CMP_SHIFT = -4096
fate-aac-is-encode: CMP_TARGET = 597
fate-aac-is-encode: CMP_TARGET = 615
fate-aac-is-encode: SIZE_TOLERANCE = 3560
fate-aac-is-encode: FUZZ = 10