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| author | Rostislav Pehlivanov <atomnuker@gmail.com> | 2015-07-02 19:13:00 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-07-03 13:17:57 +0200 |
| commit | 8e607c747eca582a4ef66fa85a27492f517cde1d (patch) | |
| tree | 656d18c3b7710f293ada9f4765369d01244b58be /libavcodec/aacpsy.c | |
| parent | 8f4cfda9721fa099f49869092295717d0b4cc133 (diff) | |
| download | ffmpeg-8e607c747eca582a4ef66fa85a27492f517cde1d.tar.gz | |
aacpsy: use a different metric for the spread of a band
This commit modifies 02dbed6 to use band->active_lines to better gauge how much information is contained within a single band and thus allow the perceptual noise subsitution to more accurately determine which bands to code as noise. The spread[w+g] used before this patch behaved more like a low-pass filter for PNS band_types, which could mistakingly mark some low frequency bands as noise.
Reviewed-by: Claudio Freire <klaussfreire@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavcodec/aacpsy.c')
| -rw-r--r-- | libavcodec/aacpsy.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/aacpsy.c b/libavcodec/aacpsy.c index 78232d4518..b16f6b94f0 100644 --- a/libavcodec/aacpsy.c +++ b/libavcodec/aacpsy.c @@ -787,7 +787,7 @@ static void psy_3gpp_analyze_channel(FFPsyContext *ctx, int channel, psy_band->threshold = band->thr; psy_band->energy = band->energy; - psy_band->spread = spread_en[w+g]; + psy_band->spread = band->active_lines * 2.0f / band_sizes[g]; } } |