From 3b00fd5985c3ddffe7f66f72dcaa13b478fc7459 Mon Sep 17 00:00:00 2001
From: Jakub Stachowski <qbast@go2.pl>
Date: Wed, 11 Apr 2012 23:36:07 +0200
Subject: [PATCH] wmalosslessdec: Reset residues to 0 if they were not decoded
 from bitstream.

If channel residues are have not been decoded from bitstream, they should be
initialized to 0 instead of using values from previous subframe.
This causes bursts of noise in silent parts of some files.
This patch fixes bug #1055

Reviewed-by: Benjamin Larsson <benjamin@southpole.se>
Reviewed-by: Mashiat Sarker Shakkhar <mashiat.sarker@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/wmalosslessdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index ab7af9552c..e5114436e6 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -955,7 +955,8 @@ static int decode_subframe(WmallDecodeCtx *s)
                 else
                     use_normal_update_speed(s, i);
                 revert_cdlms(s, i, 0, subframe_len);
-            }
+            } else
+                memset(s->channel_residues, 0, sizeof(s->channel_residues));
     }
     if (s->do_mclms)
         revert_mclms(s, subframe_len);