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