forked from len0rd/rockbox
115 lines
5.5 KiB
C
115 lines
5.5 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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/*********************************************/
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/* Decode quantization indices of excitation */
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/*********************************************/
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void silk_decode_pulses(
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ec_dec *psRangeDec, /* I/O Compressor data structure */
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opus_int16 pulses[], /* O Excitation signal */
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const opus_int signalType, /* I Sigtype */
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const opus_int quantOffsetType, /* I quantOffsetType */
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const opus_int frame_length /* I Frame length */
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)
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{
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opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex;
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opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ];
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opus_int16 *pulses_ptr;
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const opus_uint8 *cdf_ptr;
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/*********************/
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/* Decode rate level */
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/*********************/
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RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 );
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/* Calculate number of shell blocks */
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silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
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iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
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if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) {
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celt_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
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iter++;
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}
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/***************************************************/
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/* Sum-Weighted-Pulses Decoding */
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/***************************************************/
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cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ];
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for( i = 0; i < iter; i++ ) {
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nLshifts[ i ] = 0;
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sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 );
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/* LSB indication */
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while( sum_pulses[ i ] == SILK_MAX_PULSES + 1 ) {
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nLshifts[ i ]++;
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/* When we've already got 10 LSBs, we shift the table to not allow (SILK_MAX_PULSES + 1) */
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sum_pulses[ i ] = ec_dec_icdf( psRangeDec,
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silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 );
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}
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}
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/***************************************************/
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/* Shell decoding */
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/***************************************************/
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for( i = 0; i < iter; i++ ) {
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if( sum_pulses[ i ] > 0 ) {
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silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] );
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} else {
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silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) );
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}
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}
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/***************************************************/
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/* LSB Decoding */
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/***************************************************/
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for( i = 0; i < iter; i++ ) {
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if( nLshifts[ i ] > 0 ) {
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nLS = nLshifts[ i ];
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pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ];
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for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) {
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abs_q = pulses_ptr[ k ];
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for( j = 0; j < nLS; j++ ) {
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abs_q = silk_LSHIFT( abs_q, 1 );
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abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 );
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}
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pulses_ptr[ k ] = abs_q;
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}
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/* Mark the number of pulses non-zero for sign decoding. */
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sum_pulses[ i ] |= nLS << 5;
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}
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}
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/****************************************/
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/* Decode and add signs to pulse signal */
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/****************************************/
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silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
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}
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