1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/code_signs.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,115 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +
1.37 +/*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/
1.38 +/*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/
1.39 +/* shifting avoids if-statement */
1.40 +#define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 )
1.41 +#define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 )
1.42 +
1.43 +/* Encodes signs of excitation */
1.44 +void silk_encode_signs(
1.45 + ec_enc *psRangeEnc, /* I/O Compressor data structure */
1.46 + const opus_int8 pulses[], /* I pulse signal */
1.47 + opus_int length, /* I length of input */
1.48 + const opus_int signalType, /* I Signal type */
1.49 + const opus_int quantOffsetType, /* I Quantization offset type */
1.50 + const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
1.51 +)
1.52 +{
1.53 + opus_int i, j, p;
1.54 + opus_uint8 icdf[ 2 ];
1.55 + const opus_int8 *q_ptr;
1.56 + const opus_uint8 *icdf_ptr;
1.57 +
1.58 + icdf[ 1 ] = 0;
1.59 + q_ptr = pulses;
1.60 + i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
1.61 + icdf_ptr = &silk_sign_iCDF[ i ];
1.62 + length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
1.63 + for( i = 0; i < length; i++ ) {
1.64 + p = sum_pulses[ i ];
1.65 + if( p > 0 ) {
1.66 + icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
1.67 + for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
1.68 + if( q_ptr[ j ] != 0 ) {
1.69 + ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 );
1.70 + }
1.71 + }
1.72 + }
1.73 + q_ptr += SHELL_CODEC_FRAME_LENGTH;
1.74 + }
1.75 +}
1.76 +
1.77 +/* Decodes signs of excitation */
1.78 +void silk_decode_signs(
1.79 + ec_dec *psRangeDec, /* I/O Compressor data structure */
1.80 + opus_int pulses[], /* I/O pulse signal */
1.81 + opus_int length, /* I length of input */
1.82 + const opus_int signalType, /* I Signal type */
1.83 + const opus_int quantOffsetType, /* I Quantization offset type */
1.84 + const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */
1.85 +)
1.86 +{
1.87 + opus_int i, j, p;
1.88 + opus_uint8 icdf[ 2 ];
1.89 + opus_int *q_ptr;
1.90 + const opus_uint8 *icdf_ptr;
1.91 +
1.92 + icdf[ 1 ] = 0;
1.93 + q_ptr = pulses;
1.94 + i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) );
1.95 + icdf_ptr = &silk_sign_iCDF[ i ];
1.96 + length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH );
1.97 + for( i = 0; i < length; i++ ) {
1.98 + p = sum_pulses[ i ];
1.99 + if( p > 0 ) {
1.100 + icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ];
1.101 + for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) {
1.102 + if( q_ptr[ j ] > 0 ) {
1.103 + /* attach sign */
1.104 +#if 0
1.105 + /* conditional implementation */
1.106 + if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) {
1.107 + q_ptr[ j ] = -q_ptr[ j ];
1.108 + }
1.109 +#else
1.110 + /* implementation with shift, subtraction, multiplication */
1.111 + q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) );
1.112 +#endif
1.113 + }
1.114 + }
1.115 + }
1.116 + q_ptr += SHELL_CODEC_FRAME_LENGTH;
1.117 + }
1.118 +}
