From c9ca220ef26e36abd22085e6fa156c0dbc43bbf0 Mon Sep 17 00:00:00 2001
From: John Stebbins <stebbins@jetheaddev.com>
Date: Wed, 20 Nov 2013 09:26:45 -0800
Subject: [PATCH] ac3dec: make drc_scale exponentially
The a52 spec suggests that "partial compression" should scale the
drc value in this manner.
Signed-off-by: Anton Khirnov <anton@khirnov.net>
---
libavcodec/ac3dec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 7172e6378d4..e1c696269e7 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -756,8 +756,8 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
i = !s->channel_mode;
do {
if (get_bits1(gbc)) {
- s->dynamic_range[i] = ((dynamic_range_tab[get_bits(gbc, 8)] - 1.0) *
- s->drc_scale) + 1.0;
+ s->dynamic_range[i] = powf(dynamic_range_tab[get_bits(gbc, 8)],
+ s->drc_scale);
} else if (blk == 0) {
s->dynamic_range[i] = 1.0f;
}
--
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