1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/decode_pulses.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 +/*********************************************/
1.38 +/* Decode quantization indices of excitation */
1.39 +/*********************************************/
1.40 +void silk_decode_pulses(
1.41 + ec_dec *psRangeDec, /* I/O Compressor data structure */
1.42 + opus_int pulses[], /* O Excitation signal */
1.43 + const opus_int signalType, /* I Sigtype */
1.44 + const opus_int quantOffsetType, /* I quantOffsetType */
1.45 + const opus_int frame_length /* I Frame length */
1.46 +)
1.47 +{
1.48 + opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex;
1.49 + opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
1.50 + opus_int *pulses_ptr;
1.51 + const opus_uint8 *cdf_ptr;
1.52 +
1.53 + /*********************/
1.54 + /* Decode rate level */
1.55 + /*********************/
1.56 + RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
1.57 +
1.58 + /* Calculate number of shell blocks */
1.59 + silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
1.60 + iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
1.61 + if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
1.62 + silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
1.63 + iter++;
1.64 + }
1.65 +
1.66 + /***************************************************/
1.67 + /* Sum-Weighted-Pulses Decoding */
1.68 + /***************************************************/
1.69 + cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
1.70 + for( i = 0; i < iter; i++ ) {
1.71 + nLshifts[ i ] = 0;
1.72 + sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
1.73 +
1.74 + /* LSB indication */
1.75 + while( sum_pulses[ i ] == MAX_PULSES + 1 ) {
1.76 + nLshifts[ i ]++;
1.77 + /* When we've already got 10 LSBs, we shift the table to not allow (MAX_PULSES + 1) */
1.78 + sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
1.79 + silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
1.80 + }
1.81 + }
1.82 +
1.83 + /***************************************************/
1.84 + /* Shell decoding */
1.85 + /***************************************************/
1.86 + for( i = 0; i < iter; i++ ) {
1.87 + if( sum_pulses[ i ] > 0 ) {
1.88 + silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
1.89 + } else {
1.90 + silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( opus_int ) );
1.91 + }
1.92 + }
1.93 +
1.94 + /***************************************************/
1.95 + /* LSB Decoding */
1.96 + /***************************************************/
1.97 + for( i = 0; i < iter; i++ ) {
1.98 + if( nLshifts[ i ] > 0 ) {
1.99 + nLS = nLshifts[ i ];
1.100 + pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
1.101 + for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
1.102 + abs_q = pulses_ptr[ k ];
1.103 + for( j = 0; j < nLS; j++ ) {
1.104 + abs_q = silk_LSHIFT( abs_q, 1 );
1.105 + abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
1.106 + }
1.107 + pulses_ptr[ k ] = abs_q;
1.108 + }
1.109 + /* Mark the number of pulses non-zero for sign decoding. */
1.110 + sum_pulses[ i ] |= nLS << 5;
1.111 + }
1.112 + }
1.113 +
1.114 + /****************************************/
1.115 + /* Decode and add signs to pulse signal */
1.116 + /****************************************/
1.117 + silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
1.118 +}
