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comparison: media/libopus/silk/float/warped_autocorrelation_FLP.c
media/libopus/silk/float/warped_autocorrelation_FLP.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:98c3ba9f5009 |
|---|---|
| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "main_FLP.h" | |
| 33 | |
| 34 /* Autocorrelations for a warped frequency axis */ | |
| 35 void silk_warped_autocorrelation_FLP( | |
| 36 silk_float *corr, /* O Result [order + 1] */ | |
| 37 const silk_float *input, /* I Input data to correlate */ | |
| 38 const silk_float warping, /* I Warping coefficient */ | |
| 39 const opus_int length, /* I Length of input */ | |
| 40 const opus_int order /* I Correlation order (even) */ | |
| 41 ) | |
| 42 { | |
| 43 opus_int n, i; | |
| 44 double tmp1, tmp2; | |
| 45 double state[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; | |
| 46 double C[ MAX_SHAPE_LPC_ORDER + 1 ] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; | |
| 47 | |
| 48 /* Order must be even */ | |
| 49 silk_assert( ( order & 1 ) == 0 ); | |
| 50 | |
| 51 /* Loop over samples */ | |
| 52 for( n = 0; n < length; n++ ) { | |
| 53 tmp1 = input[ n ]; | |
| 54 /* Loop over allpass sections */ | |
| 55 for( i = 0; i < order; i += 2 ) { | |
| 56 /* Output of allpass section */ | |
| 57 tmp2 = state[ i ] + warping * ( state[ i + 1 ] - tmp1 ); | |
| 58 state[ i ] = tmp1; | |
| 59 C[ i ] += state[ 0 ] * tmp1; | |
| 60 /* Output of allpass section */ | |
| 61 tmp1 = state[ i + 1 ] + warping * ( state[ i + 2 ] - tmp2 ); | |
| 62 state[ i + 1 ] = tmp2; | |
| 63 C[ i + 1 ] += state[ 0 ] * tmp2; | |
| 64 } | |
| 65 state[ order ] = tmp1; | |
| 66 C[ order ] += state[ 0 ] * tmp1; | |
| 67 } | |
| 68 | |
| 69 /* Copy correlations in silk_float output format */ | |
| 70 for( i = 0; i < order + 1; i++ ) { | |
| 71 corr[ i ] = ( silk_float )C[ i ]; | |
| 72 } | |
| 73 } |
