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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libspeex/lpc.h | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libspeex/lpc.h')
-rw-r--r-- | lib/rbcodec/codecs/libspeex/lpc.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libspeex/lpc.h b/lib/rbcodec/codecs/libspeex/lpc.h new file mode 100644 index 0000000000..952ecdd933 --- /dev/null +++ b/lib/rbcodec/codecs/libspeex/lpc.h | |||
@@ -0,0 +1,53 @@ | |||
1 | /* Copyright (C) 2002 Jean-Marc Valin */ | ||
2 | /** | ||
3 | @file lpc.h | ||
4 | @brief Functions for LPC (Linear Prediction Coefficients) analysis | ||
5 | */ | ||
6 | /* | ||
7 | Redistribution and use in source and binary forms, with or without | ||
8 | modification, are permitted provided that the following conditions | ||
9 | are met: | ||
10 | |||
11 | - Redistributions of source code must retain the above copyright | ||
12 | notice, this list of conditions and the following disclaimer. | ||
13 | |||
14 | - Redistributions in binary form must reproduce the above copyright | ||
15 | notice, this list of conditions and the following disclaimer in the | ||
16 | documentation and/or other materials provided with the distribution. | ||
17 | |||
18 | - Neither the name of the Xiph.org Foundation nor the names of its | ||
19 | contributors may be used to endorse or promote products derived from | ||
20 | this software without specific prior written permission. | ||
21 | |||
22 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
23 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
24 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
25 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR | ||
26 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
27 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
28 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
29 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
30 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
31 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
32 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
33 | */ | ||
34 | |||
35 | #ifndef LPC_H | ||
36 | #define LPC_H | ||
37 | |||
38 | #include "arch.h" | ||
39 | |||
40 | void _spx_autocorr( | ||
41 | const spx_word16_t * x, /* in: [0...n-1] samples x */ | ||
42 | spx_word16_t *ac, /* out: [0...lag-1] ac values */ | ||
43 | int lag, int n); | ||
44 | |||
45 | spx_word32_t /* returns minimum mean square error */ | ||
46 | _spx_lpc( | ||
47 | spx_coef_t * lpc, /* [0...p-1] LPC coefficients */ | ||
48 | const spx_word16_t * ac, /* in: [0...p] autocorrelation values */ | ||
49 | int p | ||
50 | ); | ||
51 | |||
52 | |||
53 | #endif | ||