| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| Redistribution and use in source and binary forms, with or without |
| modification, (subject to the limitations in the disclaimer below) |
| are permitted provided that the following conditions are met: |
| - Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| - Neither the name of Skype Limited, nor the names of specific |
| contributors, may be used to endorse or promote products derived from |
| this software without specific prior written permission. |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED |
| BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, |
| BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main.h" |
| |
| /*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/ |
| /*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/ |
| /* shifting avoids if-statement */ |
| #define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 ) |
| #define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 ) |
| |
| /* Encodes signs of excitation */ |
| void silk_encode_signs( |
| ec_enc *psRangeEnc, /* I/O Compressor data structure */ |
| const opus_int8 pulses[], /* I pulse signal */ |
| opus_int length, /* I length of input */ |
| const opus_int signalType, /* I Signal type */ |
| const opus_int quantOffsetType, /* I Quantization offset type */ |
| const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ |
| ) |
| { |
| opus_int i, j, p; |
| opus_uint8 icdf[ 2 ]; |
| const opus_int8 *q_ptr; |
| const opus_uint8 *icdf_ptr; |
| |
| icdf[ 1 ] = 0; |
| q_ptr = pulses; |
| i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); |
| icdf_ptr = &silk_sign_iCDF[ i ]; |
| length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
| for( i = 0; i < length; i++ ) { |
| p = sum_pulses[ i ]; |
| if( p > 0 ) { |
| icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; |
| for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { |
| if( q_ptr[ j ] != 0 ) { |
| ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 ); |
| } |
| } |
| } |
| q_ptr += SHELL_CODEC_FRAME_LENGTH; |
| } |
| } |
| |
| /* Decodes signs of excitation */ |
| void silk_decode_signs( |
| ec_dec *psRangeDec, /* I/O Compressor data structure */ |
| opus_int pulses[], /* I/O pulse signal */ |
| opus_int length, /* I length of input */ |
| const opus_int signalType, /* I Signal type */ |
| const opus_int quantOffsetType, /* I Quantization offset type */ |
| const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ |
| ) |
| { |
| opus_int i, j, p; |
| opus_uint8 icdf[ 2 ]; |
| opus_int *q_ptr; |
| const opus_uint8 *icdf_ptr; |
| |
| icdf[ 1 ] = 0; |
| q_ptr = pulses; |
| i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); |
| icdf_ptr = &silk_sign_iCDF[ i ]; |
| length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
| for( i = 0; i < length; i++ ) { |
| p = sum_pulses[ i ]; |
| if( p > 0 ) { |
| icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; |
| for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { |
| if( q_ptr[ j ] > 0 ) { |
| /* attach sign */ |
| #if 0 |
| /* conditional implementation */ |
| if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { |
| q_ptr[ j ] = -q_ptr[ j ]; |
| } |
| #else |
| /* implementation with shift, subtraction, multiplication */ |
| q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) ); |
| #endif |
| } |
| } |
| } |
| q_ptr += SHELL_CODEC_FRAME_LENGTH; |
| } |
| } |