| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| - Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| names of specific contributors, may be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. |
| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main.h" |
| #include "stack_alloc.h" |
| |
| /*********************************************/ |
| /* Encode quantization indices of excitation */ |
| /*********************************************/ |
| |
| static OPUS_INLINE opus_int combine_and_check( /* return ok */ |
| opus_int *pulses_comb, /* O */ |
| const opus_int *pulses_in, /* I */ |
| opus_int max_pulses, /* I max value for sum of pulses */ |
| opus_int len /* I number of output values */ |
| ) |
| { |
| opus_int k, sum; |
| |
| for( k = 0; k < len; k++ ) { |
| sum = pulses_in[ 2 * k ] + pulses_in[ 2 * k + 1 ]; |
| if( sum > max_pulses ) { |
| return 1; |
| } |
| pulses_comb[ k ] = sum; |
| } |
| |
| return 0; |
| } |
| |
| /* Encode quantization indices of excitation */ |
| void silk_encode_pulses( |
| ec_enc *psRangeEnc, /* I/O compressor data structure */ |
| const opus_int signalType, /* I Signal type */ |
| const opus_int quantOffsetType, /* I quantOffsetType */ |
| opus_int8 pulses[], /* I quantization indices */ |
| const opus_int frame_length /* I Frame length */ |
| ) |
| { |
| opus_int i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0; |
| opus_int32 abs_q, minSumBits_Q5, sumBits_Q5; |
| VARDECL( opus_int, abs_pulses ); |
| VARDECL( opus_int, sum_pulses ); |
| VARDECL( opus_int, nRshifts ); |
| opus_int pulses_comb[ 8 ]; |
| opus_int *abs_pulses_ptr; |
| const opus_int8 *pulses_ptr; |
| const opus_uint8 *cdf_ptr; |
| const opus_uint8 *nBits_ptr; |
| SAVE_STACK; |
| |
| silk_memset( pulses_comb, 0, 8 * sizeof( opus_int ) ); /* Fixing Valgrind reported problem*/ |
| |
| /****************************/ |
| /* Prepare for shell coding */ |
| /****************************/ |
| /* Calculate number of shell blocks */ |
| silk_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH ); |
| iter = silk_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH ); |
| if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ) { |
| silk_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */ |
| iter++; |
| silk_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(opus_int8)); |
| } |
| |
| /* Take the absolute value of the pulses */ |
| ALLOC( abs_pulses, iter * SHELL_CODEC_FRAME_LENGTH, opus_int ); |
| silk_assert( !( SHELL_CODEC_FRAME_LENGTH & 3 ) ); |
| for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) { |
| abs_pulses[i+0] = ( opus_int )silk_abs( pulses[ i + 0 ] ); |
| abs_pulses[i+1] = ( opus_int )silk_abs( pulses[ i + 1 ] ); |
| abs_pulses[i+2] = ( opus_int )silk_abs( pulses[ i + 2 ] ); |
| abs_pulses[i+3] = ( opus_int )silk_abs( pulses[ i + 3 ] ); |
| } |
| |
| /* Calc sum pulses per shell code frame */ |
| ALLOC( sum_pulses, iter, opus_int ); |
| ALLOC( nRshifts, iter, opus_int ); |
| abs_pulses_ptr = abs_pulses; |
| for( i = 0; i < iter; i++ ) { |
| nRshifts[ i ] = 0; |
| |
| while( 1 ) { |
| /* 1+1 -> 2 */ |
| scale_down = combine_and_check( pulses_comb, abs_pulses_ptr, silk_max_pulses_table[ 0 ], 8 ); |
| /* 2+2 -> 4 */ |
| scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 1 ], 4 ); |
| /* 4+4 -> 8 */ |
| scale_down += combine_and_check( pulses_comb, pulses_comb, silk_max_pulses_table[ 2 ], 2 ); |
| /* 8+8 -> 16 */ |
| scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, silk_max_pulses_table[ 3 ], 1 ); |
| |
| if( scale_down ) { |
| /* We need to downscale the quantization signal */ |
| nRshifts[ i ]++; |
| for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { |
| abs_pulses_ptr[ k ] = silk_RSHIFT( abs_pulses_ptr[ k ], 1 ); |
| } |
| } else { |
| /* Jump out of while(1) loop and go to next shell coding frame */ |
| break; |
| } |
| } |
| abs_pulses_ptr += SHELL_CODEC_FRAME_LENGTH; |
| } |
| |
| /**************/ |
| /* Rate level */ |
| /**************/ |
| /* find rate level that leads to fewest bits for coding of pulses per block info */ |
| minSumBits_Q5 = silk_int32_MAX; |
| for( k = 0; k < N_RATE_LEVELS - 1; k++ ) { |
| nBits_ptr = silk_pulses_per_block_BITS_Q5[ k ]; |
| sumBits_Q5 = silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ]; |
| for( i = 0; i < iter; i++ ) { |
| if( nRshifts[ i ] > 0 ) { |
| sumBits_Q5 += nBits_ptr[ SILK_MAX_PULSES + 1 ]; |
| } else { |
| sumBits_Q5 += nBits_ptr[ sum_pulses[ i ] ]; |
| } |
| } |
| if( sumBits_Q5 < minSumBits_Q5 ) { |
| minSumBits_Q5 = sumBits_Q5; |
| RateLevelIndex = k; |
| } |
| } |
| ec_enc_icdf( psRangeEnc, RateLevelIndex, silk_rate_levels_iCDF[ signalType >> 1 ], 8 ); |
| |
| /***************************************************/ |
| /* Sum-Weighted-Pulses Encoding */ |
| /***************************************************/ |
| cdf_ptr = silk_pulses_per_block_iCDF[ RateLevelIndex ]; |
| for( i = 0; i < iter; i++ ) { |
| if( nRshifts[ i ] == 0 ) { |
| ec_enc_icdf( psRangeEnc, sum_pulses[ i ], cdf_ptr, 8 ); |
| } else { |
| ec_enc_icdf( psRangeEnc, SILK_MAX_PULSES + 1, cdf_ptr, 8 ); |
| for( k = 0; k < nRshifts[ i ] - 1; k++ ) { |
| ec_enc_icdf( psRangeEnc, SILK_MAX_PULSES + 1, silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 ); |
| } |
| ec_enc_icdf( psRangeEnc, sum_pulses[ i ], silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 ); |
| } |
| } |
| |
| /******************/ |
| /* Shell Encoding */ |
| /******************/ |
| for( i = 0; i < iter; i++ ) { |
| if( sum_pulses[ i ] > 0 ) { |
| silk_shell_encoder( psRangeEnc, &abs_pulses[ i * SHELL_CODEC_FRAME_LENGTH ] ); |
| } |
| } |
| |
| /****************/ |
| /* LSB Encoding */ |
| /****************/ |
| for( i = 0; i < iter; i++ ) { |
| if( nRshifts[ i ] > 0 ) { |
| pulses_ptr = &pulses[ i * SHELL_CODEC_FRAME_LENGTH ]; |
| nLS = nRshifts[ i ] - 1; |
| for( k = 0; k < SHELL_CODEC_FRAME_LENGTH; k++ ) { |
| abs_q = (opus_int8)silk_abs( pulses_ptr[ k ] ); |
| for( j = nLS; j > 0; j-- ) { |
| bit = silk_RSHIFT( abs_q, j ) & 1; |
| ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 ); |
| } |
| bit = abs_q & 1; |
| ec_enc_icdf( psRangeEnc, bit, silk_lsb_iCDF, 8 ); |
| } |
| } |
| } |
| |
| /****************/ |
| /* Encode signs */ |
| /****************/ |
| silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses ); |
| RESTORE_STACK; |
| } |
