113 lines
5.4 KiB
C
113 lines
5.4 KiB
C
/***********************************************************************
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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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#include "opus/opus_config.h"
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#include "opus/silk/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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