46ae64cd60
This reverts commit e00426c512.
The way we handle platform-specific intrinsics is not good, so the
current state will not compile on armv8. This commit also requires
SSE4.1 support, which is likely not a good idea for portable binaries.
We'll have to redo this with more caution after 3.2 is released, or
we might simply drop opus as we're only using it as dependency for
theora right now.
Fixes #33606.
111 lines
5.3 KiB
C++
111 lines
5.3 KiB
C++
/* 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
|