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Diffstat (limited to 'lib/rbcodec/codecs/libopus/celt/entdec.h')
-rw-r--r-- | lib/rbcodec/codecs/libopus/celt/entdec.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/celt/entdec.h b/lib/rbcodec/codecs/libopus/celt/entdec.h new file mode 100644 index 0000000000..d8ab318730 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/celt/entdec.h | |||
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1 | /* Copyright (c) 2001-2011 Timothy B. Terriberry | ||
2 | Copyright (c) 2008-2009 Xiph.Org Foundation */ | ||
3 | /* | ||
4 | Redistribution and use in source and binary forms, with or without | ||
5 | modification, are permitted provided that the following conditions | ||
6 | are met: | ||
7 | |||
8 | - Redistributions of source code must retain the above copyright | ||
9 | notice, this list of conditions and the following disclaimer. | ||
10 | |||
11 | - Redistributions in binary form must reproduce the above copyright | ||
12 | notice, this list of conditions and the following disclaimer in the | ||
13 | documentation and/or other materials provided with the distribution. | ||
14 | |||
15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
16 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
17 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
18 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | ||
19 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
20 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
22 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
23 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
24 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
25 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
26 | */ | ||
27 | |||
28 | #if !defined(_entdec_H) | ||
29 | # define _entdec_H (1) | ||
30 | # include <limits.h> | ||
31 | # include "entcode.h" | ||
32 | |||
33 | /*Initializes the decoder. | ||
34 | _buf: The input buffer to use. | ||
35 | Return: 0 on success, or a negative value on error.*/ | ||
36 | void ec_dec_init(ec_dec *_this,unsigned char *_buf,opus_uint32 _storage); | ||
37 | |||
38 | /*Calculates the cumulative frequency for the next symbol. | ||
39 | This can then be fed into the probability model to determine what that | ||
40 | symbol is, and the additional frequency information required to advance to | ||
41 | the next symbol. | ||
42 | This function cannot be called more than once without a corresponding call to | ||
43 | ec_dec_update(), or decoding will not proceed correctly. | ||
44 | _ft: The total frequency of the symbols in the alphabet the next symbol was | ||
45 | encoded with. | ||
46 | Return: A cumulative frequency representing the encoded symbol. | ||
47 | If the cumulative frequency of all the symbols before the one that | ||
48 | was encoded was fl, and the cumulative frequency of all the symbols | ||
49 | up to and including the one encoded is fh, then the returned value | ||
50 | will fall in the range [fl,fh).*/ | ||
51 | unsigned ec_decode(ec_dec *_this,unsigned _ft); | ||
52 | |||
53 | /*Equivalent to ec_decode() with _ft==1<<_bits.*/ | ||
54 | unsigned ec_decode_bin(ec_dec *_this,unsigned _bits); | ||
55 | |||
56 | /*Advance the decoder past the next symbol using the frequency information the | ||
57 | symbol was encoded with. | ||
58 | Exactly one call to ec_decode() must have been made so that all necessary | ||
59 | intermediate calculations are performed. | ||
60 | _fl: The cumulative frequency of all symbols that come before the symbol | ||
61 | decoded. | ||
62 | _fh: The cumulative frequency of all symbols up to and including the symbol | ||
63 | decoded. | ||
64 | Together with _fl, this defines the range [_fl,_fh) in which the value | ||
65 | returned above must fall. | ||
66 | _ft: The total frequency of the symbols in the alphabet the symbol decoded | ||
67 | was encoded in. | ||
68 | This must be the same as passed to the preceding call to ec_decode().*/ | ||
69 | void ec_dec_update(ec_dec *_this,unsigned _fl,unsigned _fh,unsigned _ft); | ||
70 | |||
71 | /* Decode a bit that has a 1/(1<<_logp) probability of being a one */ | ||
72 | int ec_dec_bit_logp(ec_dec *_this,unsigned _logp); | ||
73 | |||
74 | /*Decodes a symbol given an "inverse" CDF table. | ||
75 | No call to ec_dec_update() is necessary after this call. | ||
76 | _icdf: The "inverse" CDF, such that symbol s falls in the range | ||
77 | [s>0?ft-_icdf[s-1]:0,ft-_icdf[s]), where ft=1<<_ftb. | ||
78 | The values must be monotonically non-increasing, and the last value | ||
79 | must be 0. | ||
80 | _ftb: The number of bits of precision in the cumulative distribution. | ||
81 | Return: The decoded symbol s.*/ | ||
82 | int ec_dec_icdf(ec_dec *_this,const unsigned char *_icdf,unsigned _ftb); | ||
83 | |||
84 | /*Extracts a raw unsigned integer with a non-power-of-2 range from the stream. | ||
85 | The bits must have been encoded with ec_enc_uint(). | ||
86 | No call to ec_dec_update() is necessary after this call. | ||
87 | _ft: The number of integers that can be decoded (one more than the max). | ||
88 | This must be at least one, and no more than 2**32-1. | ||
89 | Return: The decoded bits.*/ | ||
90 | opus_uint32 ec_dec_uint(ec_dec *_this,opus_uint32 _ft); | ||
91 | |||
92 | /*Extracts a sequence of raw bits from the stream. | ||
93 | The bits must have been encoded with ec_enc_bits(). | ||
94 | No call to ec_dec_update() is necessary after this call. | ||
95 | _ftb: The number of bits to extract. | ||
96 | This must be between 0 and 25, inclusive. | ||
97 | Return: The decoded bits.*/ | ||
98 | opus_uint32 ec_dec_bits(ec_dec *_this,unsigned _ftb); | ||
99 | |||
100 | #endif | ||