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. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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.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 */ |
| 41 | void 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 */ |
| 75 | void 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 | } |