cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main.h" cannam@154: cannam@154: /*********************************************/ cannam@154: /* Decode quantization indices of excitation */ cannam@154: /*********************************************/ cannam@154: void silk_decode_pulses( cannam@154: ec_dec *psRangeDec, /* I/O Compressor data structure */ cannam@154: opus_int16 pulses[], /* O Excitation signal */ cannam@154: const opus_int signalType, /* I Sigtype */ cannam@154: const opus_int quantOffsetType, /* I quantOffsetType */ cannam@154: const opus_int frame_length /* I Frame length */ cannam@154: ) cannam@154: { cannam@154: opus_int i, j, k, iter, abs_q, nLS, RateLevelIndex; cannam@154: opus_int sum_pulses[ MAX_NB_SHELL_BLOCKS ], nLshifts[ MAX_NB_SHELL_BLOCKS ]; cannam@154: opus_int16 *pulses_ptr; cannam@154: const opus_uint8 *cdf_ptr; cannam@154: cannam@154: /*********************/ cannam@154: /* Decode rate level */ cannam@154: /*********************/ cannam@154: RateLevelIndex = ec_dec_icdf( psRangeDec, silk_rate_levels_iCDF[ signalType >> 1 ], 8 ); cannam@154: cannam@154: /* Calculate number of shell blocks */ cannam@154: silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH ); cannam@154: iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH ); cannam@154: if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) { cannam@154: celt_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */ cannam@154: iter++; cannam@154: } cannam@154: cannam@154: /***************************************************/ cannam@154: /* Sum-Weighted-Pulses Decoding */ cannam@154: /***************************************************/ cannam@154: cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ]; cannam@154: for( i = 0; i < iter; i++ ) { cannam@154: nLshifts[ i ] = 0; cannam@154: sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cdf_ptr, 8 ); cannam@154: cannam@154: /* LSB indication */ cannam@154: while( sum_pulses[ i ] == SILK_MAX_PULSES + 1 ) { cannam@154: nLshifts[ i ]++; cannam@154: /* When we've already got 10 LSBs, we shift the table to not allow (SILK_MAX_PULSES + 1) */ cannam@154: sum_pulses[ i ] = ec_dec_icdf( psRangeDec, cannam@154: silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1] + ( nLshifts[ i ] == 10 ), 8 ); cannam@154: } cannam@154: } cannam@154: cannam@154: /***************************************************/ cannam@154: /* Shell decoding */ cannam@154: /***************************************************/ cannam@154: for( i = 0; i < iter; i++ ) { cannam@154: if( sum_pulses[ i ] > 0 ) { cannam@154: silk_shell_decoder( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], psRangeDec, sum_pulses[ i ] ); cannam@154: } else { cannam@154: silk_memset( &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof( pulses[0] ) ); cannam@154: } cannam@154: } cannam@154: cannam@154: /***************************************************/ cannam@154: /* LSB Decoding */ cannam@154: /***************************************************/ cannam@154: for( i = 0; i < iter; i++ ) { cannam@154: if( nLshifts[ i ] > 0 ) { cannam@154: nLS = nLshifts[ i ]; cannam@154: pulses_ptr = &pulses[ silk_SMULBB( i, SHELL_CODEC_FRAME_LENGTH ) ]; cannam@154: for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { cannam@154: abs_q = pulses_ptr[ k ]; cannam@154: for( j = 0; j < nLS; j++ ) { cannam@154: abs_q = silk_LSHIFT( abs_q, 1 ); cannam@154: abs_q += ec_dec_icdf( psRangeDec, silk_lsb_iCDF, 8 ); cannam@154: } cannam@154: pulses_ptr[ k ] = abs_q; cannam@154: } cannam@154: /* Mark the number of pulses non-zero for sign decoding. */ cannam@154: sum_pulses[ i ] |= nLS << 5; cannam@154: } cannam@154: } cannam@154: cannam@154: /****************************************/ cannam@154: /* Decode and add signs to pulse signal */ cannam@154: /****************************************/ cannam@154: silk_decode_signs( psRangeDec, pulses, frame_length, signalType, quantOffsetType, sum_pulses ); cannam@154: }