ef2e650592
This tunes the entropy model for coarse energy introduced in commit
c1c40a76.
It uses a constant set of parameters, tuned from about an hour and a
half of randomly selected test data encoded for each frame size,
prediction type (inter/intra), and band number.
These will be slightly sub-optimal for different frame sizes, but
should be better than what we were using.
For inter, this saves an average of 2.8, 5.2, 7.1, and 6.7 bits/frame
for frame sizes of 120, 240, 480, and 960, respectively.
For intra, this saves an average of 1.5, 3.0, 4.5, and 5.3 bits/frame
(for the same frame sizes, respectively).
52 lines
2.3 KiB
C
52 lines
2.3 KiB
C
/* Copyright (c) 2007 CSIRO
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Copyright (c) 2007-2009 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "entenc.h"
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#include "entdec.h"
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/** Encode a value that is assumed to be the realisation of a
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Laplace-distributed random process
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@param enc Entropy encoder state
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@param value Value to encode
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@param fs Probability of 0, multiplied by 32768
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@param decay Probability of the value +/- 1, multiplied by 16384
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*/
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void ec_laplace_encode(ec_enc *enc, int *value, int fs, int decay);
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/** Decode a value that is assumed to be the realisation of a
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Laplace-distributed random process
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@param dec Entropy decoder state
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@param fs Probability of 0, multiplied by 32768
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@param decay Probability of the value +/- 1, multiplied by 16384
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@return Value decoded
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*/
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int ec_laplace_decode(ec_dec *dec, int fs, int decay);
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