Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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 | |
| 34 | /* Calculates residual energies of input subframes where all subframes have LPC_order */ |
| 35 | /* of preceding samples */ |
| 36 | void silk_residual_energy_FIX( |
| 37 | opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ |
| 38 | opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */ |
| 39 | const opus_int16 x[], /* I Input signal */ |
| 40 | opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ |
| 41 | const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */ |
| 42 | const opus_int subfr_length, /* I Subframe length */ |
| 43 | const opus_int nb_subfr, /* I Number of subframes */ |
| 44 | const opus_int LPC_order /* I LPC order */ |
| 45 | ) |
| 46 | { |
| 47 | opus_int offset, i, j, rshift, lz1, lz2; |
| 48 | opus_int16 *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; |
| 49 | const opus_int16 *x_ptr; |
| 50 | opus_int32 tmp32; |
| 51 | |
| 52 | x_ptr = x; |
| 53 | offset = LPC_order + subfr_length; |
| 54 | |
| 55 | /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ |
| 56 | for( i = 0; i < nb_subfr >> 1; i++ ) { |
| 57 | /* Calculate half frame LPC residual signal including preceding samples */ |
| 58 | silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order ); |
| 59 | |
| 60 | /* Point to first subframe of the just calculated LPC residual signal */ |
| 61 | LPC_res_ptr = LPC_res + LPC_order; |
| 62 | for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { |
| 63 | /* Measure subframe energy */ |
| 64 | silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length ); |
| 65 | |
| 66 | /* Set Q values for the measured energy */ |
| 67 | nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; |
| 68 | |
| 69 | /* Move to next subframe */ |
| 70 | LPC_res_ptr += offset; |
| 71 | } |
| 72 | /* Move to next frame half */ |
| 73 | x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset; |
| 74 | } |
| 75 | |
| 76 | /* Apply the squared subframe gains */ |
| 77 | for( i = 0; i < nb_subfr; i++ ) { |
| 78 | /* Fully upscale gains and energies */ |
| 79 | lz1 = silk_CLZ32( nrgs[ i ] ) - 1; |
| 80 | lz2 = silk_CLZ32( gains[ i ] ) - 1; |
| 81 | |
| 82 | tmp32 = silk_LSHIFT32( gains[ i ], lz2 ); |
| 83 | |
| 84 | /* Find squared gains */ |
| 85 | tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ |
| 86 | |
| 87 | /* Scale energies */ |
| 88 | nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ |
| 89 | nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; |
| 90 | } |
| 91 | } |