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115 lines
5.4 KiB
115 lines
5.4 KiB
/*********************************************************************** |
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Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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- Redistributions of source code must retain the above copyright notice, |
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this list of conditions and the following disclaimer. |
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- Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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- Neither the name of Internet Society, IETF or IETF Trust, nor the |
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names of specific contributors, may be used to endorse or promote |
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products derived from this software without specific prior written |
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permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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POSSIBILITY OF SUCH DAMAGE. |
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***********************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include "main.h" |
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/*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/ |
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/*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/ |
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/* shifting avoids if-statement */ |
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#define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 ) |
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#define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 ) |
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/* Encodes signs of excitation */ |
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void silk_encode_signs( |
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ec_enc *psRangeEnc, /* I/O Compressor data structure */ |
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const opus_int8 pulses[], /* I pulse signal */ |
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opus_int length, /* I length of input */ |
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const opus_int signalType, /* I Signal type */ |
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const opus_int quantOffsetType, /* I Quantization offset type */ |
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const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ |
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) |
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{ |
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opus_int i, j, p; |
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opus_uint8 icdf[ 2 ]; |
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const opus_int8 *q_ptr; |
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const opus_uint8 *icdf_ptr; |
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icdf[ 1 ] = 0; |
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q_ptr = pulses; |
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i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); |
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icdf_ptr = &silk_sign_iCDF[ i ]; |
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length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
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for( i = 0; i < length; i++ ) { |
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p = sum_pulses[ i ]; |
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if( p > 0 ) { |
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icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; |
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for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { |
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if( q_ptr[ j ] != 0 ) { |
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ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 ); |
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} |
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} |
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} |
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q_ptr += SHELL_CODEC_FRAME_LENGTH; |
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} |
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} |
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/* Decodes signs of excitation */ |
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void silk_decode_signs( |
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ec_dec *psRangeDec, /* I/O Compressor data structure */ |
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opus_int16 pulses[], /* I/O pulse signal */ |
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opus_int length, /* I length of input */ |
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const opus_int signalType, /* I Signal type */ |
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const opus_int quantOffsetType, /* I Quantization offset type */ |
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const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ |
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) |
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{ |
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opus_int i, j, p; |
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opus_uint8 icdf[ 2 ]; |
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opus_int16 *q_ptr; |
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const opus_uint8 *icdf_ptr; |
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icdf[ 1 ] = 0; |
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q_ptr = pulses; |
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i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); |
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icdf_ptr = &silk_sign_iCDF[ i ]; |
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length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
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for( i = 0; i < length; i++ ) { |
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p = sum_pulses[ i ]; |
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if( p > 0 ) { |
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icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; |
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for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { |
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if( q_ptr[ j ] > 0 ) { |
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/* attach sign */ |
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#if 0 |
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/* conditional implementation */ |
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if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { |
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q_ptr[ j ] = -q_ptr[ j ]; |
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} |
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#else |
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/* implementation with shift, subtraction, multiplication */ |
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q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) ); |
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#endif |
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} |
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} |
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} |
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q_ptr += SHELL_CODEC_FRAME_LENGTH; |
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} |
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}
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