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mpc8: fix maximum bands handling

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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.
This commit is contained in:
Kostya Shishkov 2012-06-04 08:01:34 +02:00
parent 79c8e29a7e
commit b56825c40e
1 changed files with 3 additions and 2 deletions
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5
libavcodec/mpc8.c
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@ -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); maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
if(maxband > 32) maxband -= 33; if(maxband > 32) maxband -= 33;
} }
if(maxband > c->maxbands) if(maxband > c->maxbands + 1)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
c->last_max_band = maxband; 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++; c->cur_frame++;