[SCM] libav/experimental: Fix for issue #829 ("ffvorbis outputs crackling sound, libvorbis plays fine")

[siretart at users.alioth.debian.org]

The following commit has been merged in the experimental branch:
commit 460c0abfbb6390533a8a04e661971ff0ad4c6cbd
Author: Siarhei Siamashka <siarhei.siamashka at gmail.com>
Date:   Thu May 14 06:38:49 2009 +0000

    Fix for issue #829 ("ffvorbis outputs crackling sound, libvorbis plays fine")
    
    This was off-by-one bug which affects floor0 encoded files. Tracked down
    by valgrind (was reported as the use of uninitialized memory).
    
    With this patch applied, tiny_psnr now reports the following when ffvorbis
    is compared to libvorbis-1.0beta4 output for 'lsp-test.ogg' sample:
    stddev:    0.76 PSNR: 98.69 bytes:  3498380/  3498452
    
    Output from libvorbis-1.2 is substantially different:
    stddev:  132.57 PSNR: 53.87 bytes:  3498424/  3498496
    
    Originally committed as revision 18821 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c
index 12a9fed..b304e7b 100644
--- a/libavcodec/vorbis_dec.c
+++ b/libavcodec/vorbis_dec.c
@@ -1054,7 +1054,7 @@ static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
 
                 /* similar part for the q and p products */
-                for(j=0;j<order;j+=2) {
+                for(j=0;j+1<order;j+=2) {
                     q *= lsp[j]  -two_cos_w;
                     p *= lsp[j+1]-two_cos_w;
                 }

-- 
Libav/FFmpeg packaging