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comparison: media/libopus/silk/fixed/residual_energy_FIX.c
media/libopus/silk/fixed/residual_energy_FIX.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:d36cc3141e32 |
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| 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_FIX.h" | |
| 33 #include "stack_alloc.h" | |
| 34 | |
| 35 /* Calculates residual energies of input subframes where all subframes have LPC_order */ | |
| 36 /* of preceding samples */ | |
| 37 void silk_residual_energy_FIX( | |
| 38 opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ | |
| 39 opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */ | |
| 40 const opus_int16 x[], /* I Input signal */ | |
| 41 opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ | |
| 42 const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */ | |
| 43 const opus_int subfr_length, /* I Subframe length */ | |
| 44 const opus_int nb_subfr, /* I Number of subframes */ | |
| 45 const opus_int LPC_order /* I LPC order */ | |
| 46 ) | |
| 47 { | |
| 48 opus_int offset, i, j, rshift, lz1, lz2; | |
| 49 opus_int16 *LPC_res_ptr; | |
| 50 VARDECL( opus_int16, LPC_res ); | |
| 51 const opus_int16 *x_ptr; | |
| 52 opus_int32 tmp32; | |
| 53 SAVE_STACK; | |
| 54 | |
| 55 x_ptr = x; | |
| 56 offset = LPC_order + subfr_length; | |
| 57 | |
| 58 /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ | |
| 59 ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); | |
| 60 silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); | |
| 61 for( i = 0; i < nb_subfr >> 1; i++ ) { | |
| 62 /* Calculate half frame LPC residual signal including preceding samples */ | |
| 63 silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order ); | |
| 64 | |
| 65 /* Point to first subframe of the just calculated LPC residual signal */ | |
| 66 LPC_res_ptr = LPC_res + LPC_order; | |
| 67 for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { | |
| 68 /* Measure subframe energy */ | |
| 69 silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length ); | |
| 70 | |
| 71 /* Set Q values for the measured energy */ | |
| 72 nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; | |
| 73 | |
| 74 /* Move to next subframe */ | |
| 75 LPC_res_ptr += offset; | |
| 76 } | |
| 77 /* Move to next frame half */ | |
| 78 x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset; | |
| 79 } | |
| 80 | |
| 81 /* Apply the squared subframe gains */ | |
| 82 for( i = 0; i < nb_subfr; i++ ) { | |
| 83 /* Fully upscale gains and energies */ | |
| 84 lz1 = silk_CLZ32( nrgs[ i ] ) - 1; | |
| 85 lz2 = silk_CLZ32( gains[ i ] ) - 1; | |
| 86 | |
| 87 tmp32 = silk_LSHIFT32( gains[ i ], lz2 ); | |
| 88 | |
| 89 /* Find squared gains */ | |
| 90 tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ | |
| 91 | |
| 92 /* Scale energies */ | |
| 93 nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ | |
| 94 nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; | |
| 95 } | |
| 96 RESTORE_STACK; | |
| 97 } |
