106 lines
5.2 KiB
C
106 lines
5.2 KiB
C
/***********************************************************************
|
|
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.
|
|
***********************************************************************/
|
|
|
|
#include "SKP_Silk_main.h"
|
|
|
|
/*********************************************/
|
|
/* Decode quantization indices of excitation */
|
|
/*********************************************/
|
|
void SKP_Silk_decode_pulses(
|
|
SKP_Silk_range_coder_state *psRC, /* I/O Range coder state */
|
|
SKP_Silk_decoder_control *psDecCtrl, /* I/O Decoder control */
|
|
SKP_int q[], /* O Excitation signal */
|
|
const SKP_int frame_length /* I Frame length (preliminary) */
|
|
)
|
|
{
|
|
SKP_int i, j, k, iter, abs_q, nLS, bit;
|
|
SKP_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
|
|
SKP_int *pulses_ptr;
|
|
const SKP_uint16 *cdf_ptr;
|
|
|
|
/*********************/
|
|
/* Decode rate level */
|
|
/*********************/
|
|
SKP_Silk_range_decoder( &psDecCtrl->RateLevelIndex, psRC,
|
|
SKP_Silk_rate_levels_CDF[ psDecCtrl->sigtype ], SKP_Silk_rate_levels_CDF_offset );
|
|
|
|
/* Calculate number of shell blocks */
|
|
iter = frame_length / SHELL_CODEC_FRAME_LENGTH;
|
|
|
|
/***************************************************/
|
|
/* Sum-Weighted-Pulses Decoding */
|
|
/***************************************************/
|
|
cdf_ptr = SKP_Silk_pulses_per_block_CDF[ psDecCtrl->RateLevelIndex ];
|
|
for( i = 0; i < iter; i++ ) {
|
|
nLshifts[ i ] = 0;
|
|
SKP_Silk_range_decoder( &sum_pulses[ i ], psRC, cdf_ptr, SKP_Silk_pulses_per_block_CDF_offset );
|
|
|
|
/* LSB indication */
|
|
while( sum_pulses[ i ] == ( MAX_PULSES + 1 ) ) {
|
|
nLshifts[ i ]++;
|
|
SKP_Silk_range_decoder( &sum_pulses[ i ], psRC,
|
|
SKP_Silk_pulses_per_block_CDF[ N_RATE_LEVELS - 1 ], SKP_Silk_pulses_per_block_CDF_offset );
|
|
}
|
|
}
|
|
|
|
/***************************************************/
|
|
/* Shell decoding */
|
|
/***************************************************/
|
|
for( i = 0; i < iter; i++ ) {
|
|
if( sum_pulses[ i ] > 0 ) {
|
|
SKP_Silk_shell_decoder( &q[ SKP_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRC, sum_pulses[ i ] );
|
|
} else {
|
|
SKP_memset( &q[ SKP_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( SKP_int ) );
|
|
}
|
|
}
|
|
|
|
/***************************************************/
|
|
/* LSB Decoding */
|
|
/***************************************************/
|
|
for( i = 0; i < iter; i++ ) {
|
|
if( nLshifts[ i ] > 0 ) {
|
|
nLS = nLshifts[ i ];
|
|
pulses_ptr = &q[ SKP_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
|
|
for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
|
|
abs_q = pulses_ptr[ k ];
|
|
for( j = 0; j < nLS; j++ ) {
|
|
abs_q = SKP_LSHIFT( abs_q, 1 );
|
|
SKP_Silk_range_decoder( &bit, psRC, SKP_Silk_lsb_CDF, 1 );
|
|
abs_q += bit;
|
|
}
|
|
pulses_ptr[ k ] = abs_q;
|
|
}
|
|
}
|
|
}
|
|
|
|
/****************************************/
|
|
/* Decode and add signs to pulse signal */
|
|
/****************************************/
|
|
SKP_Silk_decode_signs( psRC, q, frame_length, psDecCtrl->sigtype,
|
|
psDecCtrl->QuantOffsetType, psDecCtrl->RateLevelIndex);
|
|
}
|