Chris@69: /*********************************************************************** Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved. Chris@69: Redistribution and use in source and binary forms, with or without Chris@69: modification, are permitted provided that the following conditions Chris@69: are met: Chris@69: - Redistributions of source code must retain the above copyright notice, Chris@69: this list of conditions and the following disclaimer. Chris@69: - Redistributions in binary form must reproduce the above copyright Chris@69: notice, this list of conditions and the following disclaimer in the Chris@69: documentation and/or other materials provided with the distribution. Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the Chris@69: names of specific contributors, may be used to endorse or promote Chris@69: products derived from this software without specific prior written Chris@69: permission. Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE Chris@69: POSSIBILITY OF SUCH DAMAGE. Chris@69: ***********************************************************************/ Chris@69: Chris@69: #ifdef HAVE_CONFIG_H Chris@69: #include "config.h" Chris@69: #endif Chris@69: Chris@69: #include "main.h" Chris@69: Chris@69: /*********************************************/ Chris@69: /* Decode quantization indices of excitation */ Chris@69: /*********************************************/ Chris@69: void silk_decode_pulses( Chris@69: ec_dec *psRangeDec, /* I/O Compressor data structure */ Chris@69: opus_int16 pulses[], /* O Excitation signal */ Chris@69: const opus_int signalType, /* I Sigtype */ Chris@69: const opus_int quantOffsetType, /* I quantOffsetType */ Chris@69: const opus_int frame_length /* I Frame length */ Chris@69: ) Chris@69: { Chris@69: opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex; Chris@69: opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ]; Chris@69: opus_int16 *pulses_ptr; Chris@69: const opus_uint8 *cdf_ptr; Chris@69: Chris@69: /*********************/ Chris@69: /* Decode rate level */ Chris@69: /*********************/ Chris@69: RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 ); Chris@69: Chris@69: /* Calculate number of shell blocks */ Chris@69: silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH ); Chris@69: iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH ); Chris@69: if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) { Chris@69: celt_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */ Chris@69: iter++; Chris@69: } Chris@69: Chris@69: /***************************************************/ Chris@69: /* Sum-Weighted-Pulses Decoding */ Chris@69: /***************************************************/ Chris@69: cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ]; Chris@69: for( i = 0; i < iter; i++ ) { Chris@69: nLshifts[ i ] = 0; Chris@69: sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 ); Chris@69: Chris@69: /* LSB indication */ Chris@69: while( sum_pulses[ i ] == SILK_MAX_PULSES + 1 ) { Chris@69: nLshifts[ i ]++; Chris@69: /* When we've already got 10 LSBs, we shift the table to not allow (SILK_MAX_PULSES + 1) */ Chris@69: sum_pulses[ i ] = ec_dec_icdf( psRangeDec, Chris@69: silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 ); Chris@69: } Chris@69: } Chris@69: Chris@69: /***************************************************/ Chris@69: /* Shell decoding */ Chris@69: /***************************************************/ Chris@69: for( i = 0; i < iter; i++ ) { Chris@69: if( sum_pulses[ i ] > 0 ) { Chris@69: silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] ); Chris@69: } else { Chris@69: silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) ); Chris@69: } Chris@69: } Chris@69: Chris@69: /***************************************************/ Chris@69: /* LSB Decoding */ Chris@69: /***************************************************/ Chris@69: for( i = 0; i < iter; i++ ) { Chris@69: if( nLshifts[ i ] > 0 ) { Chris@69: nLS = nLshifts[ i ]; Chris@69: pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ]; Chris@69: for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { Chris@69: abs_q = pulses_ptr[ k ]; Chris@69: for( j = 0; j < nLS; j++ ) { Chris@69: abs_q = silk_LSHIFT( abs_q, 1 ); Chris@69: abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 ); Chris@69: } Chris@69: pulses_ptr[ k ] = abs_q; Chris@69: } Chris@69: /* Mark the number of pulses non-zero for sign decoding. */ Chris@69: sum_pulses[ i ] |= nLS << 5; Chris@69: } Chris@69: } Chris@69: Chris@69: /****************************************/ Chris@69: /* Decode and add signs to pulse signal */ Chris@69: /****************************************/ Chris@69: silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses ); Chris@69: }