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 <klaussfre...@gmail.com>
---
libavcodec/aacpsy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/aacpsy.c b/libavcodec/aacpsy.c
index 78232d4..b16f6b9 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];
}
}
--
2.1.4
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