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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
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+/* Copyright (c) 2001-2011 Timothy B. Terriberry
+ Copyright (c) 2008-2009 Xiph.Org Foundation */
+/*
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ - Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ - Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#if !defined(_entenc_H)
+# define _entenc_H (1)
+# include <stddef.h>
+# include "entcode.h"
+
+/*Initializes the encoder.
+ _buf: The buffer to store output bytes in.
+ _size: The size of the buffer, in chars.*/
+void ec_enc_init(ec_enc *_this,unsigned char *_buf,opus_uint32 _size);
+/*Encodes a symbol given its frequency information.
+ The frequency information must be discernable by the decoder, assuming it
+ has read only the previous symbols from the stream.
+ It is allowable to change the frequency information, or even the entire
+ source alphabet, so long as the decoder can tell from the context of the
+ previously encoded information that it is supposed to do so as well.
+ _fl: The cumulative frequency of all symbols that come before the one to be
+ encoded.
+ _fh: The cumulative frequency of all symbols up to and including the one to
+ be encoded.
+ Together with _fl, this defines the range [_fl,_fh) in which the
+ decoded value will fall.
+ _ft: The sum of the frequencies of all the symbols*/
+void ec_encode(ec_enc *_this,unsigned _fl,unsigned _fh,unsigned _ft);
+
+/*Equivalent to ec_encode() with _ft==1<<_bits.*/
+void ec_encode_bin(ec_enc *_this,unsigned _fl,unsigned _fh,unsigned _bits);
+
+/* Encode a bit that has a 1/(1<<_logp) probability of being a one */
+void ec_enc_bit_logp(ec_enc *_this,int _val,unsigned _logp);
+
+/*Encodes a symbol given an "inverse" CDF table.
+ _s: The index of the symbol to encode.
+ _icdf: The "inverse" CDF, such that symbol _s falls in the range
+ [_s>0?ft-_icdf[_s-1]:0,ft-_icdf[_s]), where ft=1<<_ftb.
+ The values must be monotonically non-increasing, and the last value
+ must be 0.
+ _ftb: The number of bits of precision in the cumulative distribution.*/
+void ec_enc_icdf(ec_enc *_this,int _s,const unsigned char *_icdf,unsigned _ftb);
+
+/*Encodes a raw unsigned integer in the stream.
+ _fl: The integer to encode.
+ _ft: The number of integers that can be encoded (one more than the max).
+ This must be at least one, and no more than 2**32-1.*/
+void ec_enc_uint(ec_enc *_this,opus_uint32 _fl,opus_uint32 _ft);
+
+/*Encodes a sequence of raw bits in the stream.
+ _fl: The bits to encode.
+ _ftb: The number of bits to encode.
+ This must be between 1 and 25, inclusive.*/
+void ec_enc_bits(ec_enc *_this,opus_uint32 _fl,unsigned _ftb);
+
+/*Overwrites a few bits at the very start of an existing stream, after they
+ have already been encoded.
+ This makes it possible to have a few flags up front, where it is easy for
+ decoders to access them without parsing the whole stream, even if their
+ values are not determined until late in the encoding process, without having
+ to buffer all the intermediate symbols in the encoder.
+ In order for this to work, at least _nbits bits must have already been
+ encoded using probabilities that are an exact power of two.
+ The encoder can verify the number of encoded bits is sufficient, but cannot
+ check this latter condition.
+ _val: The bits to encode (in the least _nbits significant bits).
+ They will be decoded in order from most-significant to least.
+ _nbits: The number of bits to overwrite.
+ This must be no more than 8.*/
+void ec_enc_patch_initial_bits(ec_enc *_this,unsigned _val,unsigned _nbits);
+
+/*Compacts the data to fit in the target size.
+ This moves up the raw bits at the end of the current buffer so they are at
+ the end of the new buffer size.
+ The caller must ensure that the amount of data that's already been written
+ will fit in the new size.
+ _size: The number of bytes in the new buffer.
+ This must be large enough to contain the bits already written, and
+ must be no larger than the existing size.*/
+void ec_enc_shrink(ec_enc *_this,opus_uint32 _size);
+
+/*Indicates that there are no more symbols to encode.
+ All reamining output bytes are flushed to the output buffer.
+ ec_enc_init() must be called before the encoder can be used again.*/
+void ec_enc_done(ec_enc *_this);
+
+#endif