[FFmpeg-cvslog] mpc8: fix maximum bands handling
Kostya Shishkov
git at videolan.org
Wed Jun 6 01:20:55 CEST 2012
ffmpeg | branch: master | Kostya Shishkov <kostya.shishkov at gmail.com> | Mon Jun 4 08:01:34 2012 +0200| [b56825c40ee1329b33aed34ff8a639fa18d263a0] | committer: Kostya Shishkov
mpc8: fix maximum bands handling
In Musepack SV8 codec property tell the maximum nonzero band, but every
frame codes maximum band as a limit (i.e. strictly less than given value).
Synthesis also expects maximum nonzero band, so there's a need to convert
frame maximum band limit value.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b56825c40ee1329b33aed34ff8a639fa18d263a0
---
libavcodec/mpc8.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/mpc8.c b/libavcodec/mpc8.c
index f682edb..f2e8342 100644
--- a/libavcodec/mpc8.c
+++ b/libavcodec/mpc8.c
@@ -270,7 +270,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
if(maxband > 32) maxband -= 33;
}
- if(maxband > c->maxbands)
+ if(maxband > c->maxbands + 1)
return AVERROR_INVALIDDATA;
c->last_max_band = maxband;
@@ -405,7 +405,8 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
}
}
- ff_mpc_dequantize_and_synth(c, maxband, c->frame.data[0], avctx->channels);
+ ff_mpc_dequantize_and_synth(c, maxband - 1, c->frame.data[0],
+ avctx->channels);
c->cur_frame++;
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