cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main.h" cannam@154: cannam@154: /*#define silk_enc_map(a) ((a) > 0 ? 1 : 0)*/ cannam@154: /*#define silk_dec_map(a) ((a) > 0 ? 1 : -1)*/ cannam@154: /* shifting avoids if-statement */ cannam@154: #define silk_enc_map(a) ( silk_RSHIFT( (a), 15 ) + 1 ) cannam@154: #define silk_dec_map(a) ( silk_LSHIFT( (a), 1 ) - 1 ) cannam@154: cannam@154: /* Encodes signs of excitation */ cannam@154: void silk_encode_signs( cannam@154: ec_enc *psRangeEnc, /* I/O Compressor data structure */ cannam@154: const opus_int8 pulses[], /* I pulse signal */ cannam@154: opus_int length, /* I length of input */ cannam@154: const opus_int signalType, /* I Signal type */ cannam@154: const opus_int quantOffsetType, /* I Quantization offset type */ cannam@154: const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ cannam@154: ) cannam@154: { cannam@154: opus_int i, j, p; cannam@154: opus_uint8 icdf[ 2 ]; cannam@154: const opus_int8 *q_ptr; cannam@154: const opus_uint8 *icdf_ptr; cannam@154: cannam@154: icdf[ 1 ] = 0; cannam@154: q_ptr = pulses; cannam@154: i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); cannam@154: icdf_ptr = &silk_sign_iCDF[ i ]; cannam@154: length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); cannam@154: for( i = 0; i < length; i++ ) { cannam@154: p = sum_pulses[ i ]; cannam@154: if( p > 0 ) { cannam@154: icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; cannam@154: for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { cannam@154: if( q_ptr[ j ] != 0 ) { cannam@154: ec_enc_icdf( psRangeEnc, silk_enc_map( q_ptr[ j ]), icdf, 8 ); cannam@154: } cannam@154: } cannam@154: } cannam@154: q_ptr += SHELL_CODEC_FRAME_LENGTH; cannam@154: } cannam@154: } cannam@154: cannam@154: /* Decodes signs of excitation */ cannam@154: void silk_decode_signs( cannam@154: ec_dec *psRangeDec, /* I/O Compressor data structure */ cannam@154: opus_int16 pulses[], /* I/O pulse signal */ cannam@154: opus_int length, /* I length of input */ cannam@154: const opus_int signalType, /* I Signal type */ cannam@154: const opus_int quantOffsetType, /* I Quantization offset type */ cannam@154: const opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ] /* I Sum of absolute pulses per block */ cannam@154: ) cannam@154: { cannam@154: opus_int i, j, p; cannam@154: opus_uint8 icdf[ 2 ]; cannam@154: opus_int16 *q_ptr; cannam@154: const opus_uint8 *icdf_ptr; cannam@154: cannam@154: icdf[ 1 ] = 0; cannam@154: q_ptr = pulses; cannam@154: i = silk_SMULBB( 7, silk_ADD_LSHIFT( quantOffsetType, signalType, 1 ) ); cannam@154: icdf_ptr = &silk_sign_iCDF[ i ]; cannam@154: length = silk_RSHIFT( length + SHELL_CODEC_FRAME_LENGTH/2, LOG2_SHELL_CODEC_FRAME_LENGTH ); cannam@154: for( i = 0; i < length; i++ ) { cannam@154: p = sum_pulses[ i ]; cannam@154: if( p > 0 ) { cannam@154: icdf[ 0 ] = icdf_ptr[ silk_min( p & 0x1F, 6 ) ]; cannam@154: for( j = 0; j < SHELL_CODEC_FRAME_LENGTH; j++ ) { cannam@154: if( q_ptr[ j ] > 0 ) { cannam@154: /* attach sign */ cannam@154: #if 0 cannam@154: /* conditional implementation */ cannam@154: if( ec_dec_icdf( psRangeDec, icdf, 8 ) == 0 ) { cannam@154: q_ptr[ j ] = -q_ptr[ j ]; cannam@154: } cannam@154: #else cannam@154: /* implementation with shift, subtraction, multiplication */ cannam@154: q_ptr[ j ] *= silk_dec_map( ec_dec_icdf( psRangeDec, icdf, 8 ) ); cannam@154: #endif cannam@154: } cannam@154: } cannam@154: } cannam@154: q_ptr += SHELL_CODEC_FRAME_LENGTH; cannam@154: } cannam@154: }