1/*********************************************************************** 2Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3Redistribution and use in source and binary forms, with or without 4modification, are permitted provided that the following conditions 5are met: 6- Redistributions of source code must retain the above copyright notice, 7this list of conditions and the following disclaimer. 8- Redistributions in binary form must reproduce the above copyright 9notice, this list of conditions and the following disclaimer in the 10documentation and/or other materials provided with the distribution. 11- Neither the name of Internet Society, IETF or IETF Trust, nor the 12names of specific contributors, may be used to endorse or promote 13products derived from this software without specific prior written 14permission. 15THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25POSSIBILITY OF SUCH DAMAGE. 26***********************************************************************/ 27 28#ifdef HAVE_CONFIG_H 29#include "config.h" 30#endif 31 32#include "main.h" 33 34/*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/ 35/*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/ 36/* shifting avoids if-statement */ 37#define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 ) 38#define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 ) 39 40/* Encodes signs of excitation */ 41void silk_encode_signs( 42 ec_enc *psRangeEnc, /* I/O Compressor data structure */ 43 const opus_int8 pulses[], /* I pulse signal */ 44 opus_int length, /* I length of input */ 45 const opus_int signalType, /* I Signal type */ 46 const opus_int quantOffsetType, /* I Quantization offset type */ 47 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ 48) 49{ 50 opus_int i, j, p; 51 opus_uint8 icdf[ 2 ]; 52 const opus_int8 *q_ptr; 53 const opus_uint8 *icdf_ptr; 54 55 icdf[ 1 ] = 0; 56 q_ptr = pulses; 57 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); 58 icdf_ptr = &silk_sign_iCDF[ i ]; 59 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); 60 for( i = 0; i < length; i++ ) { 61 p = sum_pulses[ i ]; 62 if( p > 0 ) { 63 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; 64 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { 65 if( q_ptr[ j ] != 0 ) { 66 ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 ); 67 } 68 } 69 } 70 q_ptr += SHELL_CODEC_FRAME_LENGTH; 71 } 72} 73 74/* Decodes signs of excitation */ 75void silk_decode_signs( 76 ec_dec *psRangeDec, /* I/O Compressor data structure */ 77 opus_int pulses[], /* I/O pulse signal */ 78 opus_int length, /* I length of input */ 79 const opus_int signalType, /* I Signal type */ 80 const opus_int quantOffsetType, /* I Quantization offset type */ 81 const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ 82) 83{ 84 opus_int i, j, p; 85 opus_uint8 icdf[ 2 ]; 86 opus_int *q_ptr; 87 const opus_uint8 *icdf_ptr; 88 89 icdf[ 1 ] = 0; 90 q_ptr = pulses; 91 i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); 92 icdf_ptr = &silk_sign_iCDF[ i ]; 93 length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); 94 for( i = 0; i < length; i++ ) { 95 p = sum_pulses[ i ]; 96 if( p > 0 ) { 97 icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; 98 for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { 99 if( q_ptr[ j ] > 0 ) { 100 /* attach sign */ 101#if 0 102 /* conditional implementation */ 103 if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { 104 q_ptr[ j ] = -q_ptr[ j ]; 105 } 106#else 107 /* implementation with shift, subtraction, multiplication */ 108 q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) ); 109#endif 110 } 111 } 112 } 113 q_ptr += SHELL_CODEC_FRAME_LENGTH; 114 } 115} 116