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dir: /silk/SKP_Silk_encode_pulses.c/

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/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved. 
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are permitted provided that the following conditions are met:
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this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED 
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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***********************************************************************/

#include "SKP_Silk_main.h"

/*********************************************/
/* Encode quantization indices of excitation */
/*********************************************/

SKP_INLINE SKP_int combine_and_check(       /* return ok */
    SKP_int         *pulses_comb,           /* O */
    const SKP_int   *pulses_in,             /* I */
    SKP_int         max_pulses,             /* I    max value for sum of pulses */
    SKP_int         len                     /* I    number of output values */
) 
{
    SKP_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 SKP_Silk_encode_pulses(
    ec_enc                      *psRangeEnc,        /* I/O  compressor data structure                   */
    const SKP_int               signalType,         /* I    Sigtype                                     */
    const SKP_int               quantOffsetType,    /* I    quantOffsetType                             */
    SKP_int8                    pulses[],           /* I    quantization indices                        */
    const SKP_int               frame_length        /* I    Frame length                                */
)
{
    SKP_int   i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
    SKP_int32 abs_q, minSumBits_Q5, sumBits_Q5;
    SKP_int   abs_pulses[ MAX_FRAME_LENGTH ];
    SKP_int   sum_pulses[ MAX_NB_SHELL_BLOCKS ];
    SKP_int   nRshifts[   MAX_NB_SHELL_BLOCKS ];
    SKP_int   pulses_comb[ 8 ];
    SKP_int   *abs_pulses_ptr;
    const SKP_int8 *pulses_ptr;
    const SKP_uint8 *cdf_ptr;
    const SKP_uint8 *nBits_ptr;

    SKP_memset( pulses_comb, 0, 8 * sizeof( SKP_int ) ); // Fixing Valgrind reported problem

    /****************************/
    /* Prepare for shell coding */
    /****************************/
    /* Calculate number of shell blocks */
    SKP_assert( 1 << LOG2_SHELL_CODEC_FRAME_LENGTH == SHELL_CODEC_FRAME_LENGTH );
    iter = SKP_RSHIFT( frame_length, LOG2_SHELL_CODEC_FRAME_LENGTH );
    if( iter * SHELL_CODEC_FRAME_LENGTH < frame_length ){
        SKP_assert( frame_length == 12 * 10 ); /* Make sure only happens for 10 ms @ 12 kHz */
        iter++;
        SKP_memset( &pulses[ frame_length ], 0, SHELL_CODEC_FRAME_LENGTH * sizeof(SKP_int8));
    }

    /* Take the absolute value of the pulses */
    for( i = 0; i < iter * SHELL_CODEC_FRAME_LENGTH; i+=4 ) {
        abs_pulses[i+0] = ( SKP_int )SKP_abs( pulses[ i + 0 ] );
        abs_pulses[i+1] = ( SKP_int )SKP_abs( pulses[ i + 1 ] );
        abs_pulses[i+2] = ( SKP_int )SKP_abs( pulses[ i + 2 ] );
        abs_pulses[i+3] = ( SKP_int )SKP_abs( pulses[ i + 3 ] );
    }

    /* Calc sum pulses per shell code frame */
    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, SKP_Silk_max_pulses_table[ 0 ], 8 );
            /* 2+2 -> 4 */
            scale_down += combine_and_check( pulses_comb, pulses_comb, SKP_Silk_max_pulses_table[ 1 ], 4 );
            /* 4+4 -> 8 */
            scale_down += combine_and_check( pulses_comb, pulses_comb, SKP_Silk_max_pulses_table[ 2 ], 2 );
            /* 8+8 -> 16 */
            scale_down += combine_and_check( &sum_pulses[ i ], pulses_comb, SKP_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 ] = SKP_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 = SKP_int32_MAX;
    for( k = 0; k < N_RATE_LEVELS - 1; k++ ) {
        nBits_ptr  = SKP_Silk_pulses_per_block_BITS_Q5[ k ];
        sumBits_Q5 = SKP_Silk_rate_levels_BITS_Q5[ signalType >> 1 ][ k ];
        for( i = 0; i < iter; i++ ) {
            if( nRshifts[ i ] > 0 ) {
                sumBits_Q5 += nBits_ptr[ 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, SKP_Silk_rate_levels_iCDF[ signalType >> 1 ], 8 );

    /***************************************************/
    /* Sum-Weighted-Pulses Encoding                    */
    /***************************************************/
    cdf_ptr = SKP_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, MAX_PULSES + 1, cdf_ptr, 8 );
            for( k = 0; k < nRshifts[ i ] - 1; k++ ) {
                ec_enc_icdf( psRangeEnc, MAX_PULSES + 1, SKP_Silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
            }
            ec_enc_icdf( psRangeEnc, sum_pulses[ i ], SKP_Silk_pulses_per_block_iCDF[ N_RATE_LEVELS - 1 ], 8 );
        }
    }

    /******************/
    /* Shell Encoding */
    /******************/
    for( i = 0; i < iter; i++ ) {
        if( sum_pulses[ i ] > 0 ) {
            SKP_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 = (SKP_int8)SKP_abs( pulses_ptr[ k ] );
                for( j = nLS; j > 0; j-- ) {
                    bit = SKP_RSHIFT( abs_q, j ) & 1;
                    ec_enc_icdf( psRangeEnc, bit, SKP_Silk_lsb_iCDF, 8 );
                }
                bit = abs_q & 1;
                ec_enc_icdf( psRangeEnc, bit, SKP_Silk_lsb_iCDF, 8 );
            }
        }
    }

#if! USE_CELT_PVQ
    /****************/
    /* Encode signs */
    /****************/
    SKP_Silk_encode_signs( psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses );
#endif
}