mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-23 20:36:53 +01:00
116 lines
5.5 KiB
C
116 lines
5.5 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, 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 Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
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.
|
|
***********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "main.h"
|
|
|
|
/*********************************************/
|
|
/* Decode quantization indices of excitation */
|
|
/*********************************************/
|
|
void silk_decode_pulses(
|
|
ec_dec *psRangeDec, /* I/O Compressor data structure */
|
|
opus_int16 pulses[], /* O Excitation signal */
|
|
const opus_int signalType, /* I Sigtype */
|
|
const opus_int quantOffsetType, /* I quantOffsetType */
|
|
const opus_int frame_length /* I Frame length */
|
|
)
|
|
{
|
|
opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex;
|
|
opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
|
|
opus_int16 *pulses_ptr;
|
|
const opus_uint8 *cdf_ptr;
|
|
|
|
/*********************/
|
|
/* Decode rate level */
|
|
/*********************/
|
|
RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
|
|
|
|
/* Calculate number of shell blocks */
|
|
silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
|
|
iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
|
|
if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
|
|
silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
|
|
iter++;
|
|
}
|
|
|
|
/***************************************************/
|
|
/* Sum-Weighted-Pulses Decoding */
|
|
/***************************************************/
|
|
cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
|
|
for( i = 0; i < iter; i++ ) {
|
|
nLshifts[ i ] = 0;
|
|
sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
|
|
|
|
/* LSB indication */
|
|
while( sum_pulses[ i ] == SILK_MAX_PULSES + 1 ) {
|
|
nLshifts[ i ]++;
|
|
/* When we've already got 10 LSBs, we shift the table to not allow (SILK_MAX_PULSES + 1) */
|
|
sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
|
|
silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
|
|
}
|
|
}
|
|
|
|
/***************************************************/
|
|
/* Shell decoding */
|
|
/***************************************************/
|
|
for( i = 0; i < iter; i++ ) {
|
|
if( sum_pulses[ i ] > 0 ) {
|
|
silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
|
|
} else {
|
|
silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) );
|
|
}
|
|
}
|
|
|
|
/***************************************************/
|
|
/* LSB Decoding */
|
|
/***************************************************/
|
|
for( i = 0; i < iter; i++ ) {
|
|
if( nLshifts[ i ] > 0 ) {
|
|
nLS = nLshifts[ i ];
|
|
pulses_ptr = &pulses[ silk_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 = silk_LSHIFT( abs_q, 1 );
|
|
abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
|
|
}
|
|
pulses_ptr[ k ] = abs_q;
|
|
}
|
|
/* Mark the number of pulses non-zero for sign decoding. */
|
|
sum_pulses[ i ] |= nLS << 5;
|
|
}
|
|
}
|
|
|
|
/****************************************/
|
|
/* Decode and add signs to pulse signal */
|
|
/****************************************/
|
|
silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
|
|
}
|