[FFmpeg-cvslog] aacsbr: Turnoff in the event of over read.

[Alex Converse]

ffmpeg | branch: master | Alex Converse <alex.converse at gmail.com> | Mon Mar 20 12:44:42 2017 -0700| [504403ab28688588fb85817ad58964482f67f29f] | committer: Sean McGovern

aacsbr: Turnoff in the event of over read.

Aliased compressed AAC bytes are almost certainly not meaningful SBR
data. In the wild this causes harsh artifacts switching HE-AAC streams
that don't have SBR headers aligned with segment boundaries.

Turning off SBR falls back to a default set of upsampling parameters
that can function as a sort of error concealment. This is consistent
with how the decoder handles other sorts of errors.

Bug-Id: 1047
CC: libav-stable at libav.org

Signed-off-by: Sean McGovern <gseanmcg at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=504403ab28688588fb85817ad58964482f67f29f
---

 libavcodec/aacsbr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c
index 99f7b0829c..d9bbe5eacc 100644
--- a/libavcodec/aacsbr.c
+++ b/libavcodec/aacsbr.c
@@ -1097,6 +1097,7 @@ int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
     if (bytes_read > cnt) {
         av_log(ac->avctx, AV_LOG_ERROR,
                "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
+        sbr_turnoff(sbr);
     }
     return cnt;
 }