opus-embedded-sys 0.1.1

Bindings to libopus for decoding Opus audio on embedded systems
Documentation 
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/* Copyright (c) 2014-2020, Cisco Systems, INC
   Written by XiangMingZhu WeiZhou MinPeng YanWang FrancisQuiers

   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.

   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 <xmmintrin.h>
#include <emmintrin.h>
#include <smmintrin.h>
#include "main.h"
#include "celt/x86/x86cpu.h"

/* Entropy constrained matrix-weighted VQ, hard-coded to 5-element vectors, for a single input data vector */
void silk_VQ_WMat_EC_sse4_1(
    opus_int8                   *ind,                           /* O    index of best codebook vector               */
    opus_int32                  *res_nrg_Q15,                   /* O    best residual energy                        */
    opus_int32                  *rate_dist_Q8,                  /* O    best total bitrate                          */
    opus_int                    *gain_Q7,                       /* O    sum of absolute LTP coefficients            */
    const opus_int32            *XX_Q17,                        /* I    correlation matrix                          */
    const opus_int32            *xX_Q17,                        /* I    correlation vector                          */
    const opus_int8             *cb_Q7,                         /* I    codebook                                    */
    const opus_uint8            *cb_gain_Q7,                    /* I    codebook effective gain                     */
    const opus_uint8            *cl_Q5,                         /* I    code length for each codebook vector        */
    const opus_int              subfr_len,                      /* I    number of samples per subframe              */
    const opus_int32            max_gain_Q7,                    /* I    maximum sum of absolute LTP coefficients    */
    const opus_int              L                               /* I    number of vectors in codebook               */
)
{
    opus_int   k, gain_tmp_Q7;
    const opus_int8 *cb_row_Q7;
    opus_int32 neg_xX_Q24[ 5 ];
    opus_int32 sum1_Q15, sum2_Q24;
    opus_int32 bits_res_Q8, bits_tot_Q8;
    __m128i v_XX_31_Q17, v_XX_42_Q17, v_cb_row_31_Q7, v_cb_row_42_Q7, v_acc1_Q24, v_acc2_Q24;

    /* Negate and convert to new Q domain */
    neg_xX_Q24[ 0 ] = -silk_LSHIFT32( xX_Q17[ 0 ], 7 );
    neg_xX_Q24[ 1 ] = -silk_LSHIFT32( xX_Q17[ 1 ], 7 );
    neg_xX_Q24[ 2 ] = -silk_LSHIFT32( xX_Q17[ 2 ], 7 );
    neg_xX_Q24[ 3 ] = -silk_LSHIFT32( xX_Q17[ 3 ], 7 );
    neg_xX_Q24[ 4 ] = -silk_LSHIFT32( xX_Q17[ 4 ], 7 );

    v_XX_31_Q17 = _mm_loadu_si128( (__m128i *)(void*)(&XX_Q17[ 1 ] ) );
    v_XX_42_Q17 = _mm_shuffle_epi32( v_XX_31_Q17, _MM_SHUFFLE( 0, 3, 2, 1 ) );

    /* Loop over codebook */
    *rate_dist_Q8 = silk_int32_MAX;
    *res_nrg_Q15 = silk_int32_MAX;
    cb_row_Q7 = cb_Q7;
    /* If things go really bad, at least *ind is set to something safe. */
    *ind = 0;
    for( k = 0; k < L; k++ ) {
        opus_int32 penalty;
        gain_tmp_Q7 = cb_gain_Q7[k];
        /* Weighted rate */
        /* Quantization error: 1 - 2 * xX * cb + cb' * XX * cb */
        sum1_Q15 = SILK_FIX_CONST( 1.001, 15 );

        /* Penalty for too large gain */
        penalty = silk_LSHIFT32( silk_max( silk_SUB32( gain_tmp_Q7, max_gain_Q7 ), 0 ), 11 );

        /* first row of XX_Q17 */
        v_cb_row_31_Q7 = OP_CVTEPI8_EPI32_M32( &cb_row_Q7[ 1 ] );
        v_cb_row_42_Q7 = _mm_shuffle_epi32( v_cb_row_31_Q7, _MM_SHUFFLE( 0, 3, 2, 1 ) );
        v_cb_row_31_Q7 = _mm_mul_epi32( v_XX_31_Q17, v_cb_row_31_Q7 );
        v_cb_row_42_Q7 = _mm_mul_epi32( v_XX_42_Q17, v_cb_row_42_Q7 );
        v_acc1_Q24 = _mm_add_epi64( v_cb_row_31_Q7, v_cb_row_42_Q7);
        v_acc2_Q24 = _mm_shuffle_epi32( v_acc1_Q24, _MM_SHUFFLE( 1, 0, 3, 2 ) );
        v_acc1_Q24 = _mm_add_epi64( v_acc1_Q24, v_acc2_Q24);
        sum2_Q24 = _mm_cvtsi128_si32( v_acc1_Q24 );
        sum2_Q24 = silk_ADD32( neg_xX_Q24[ 0 ], sum2_Q24 );
        sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[  0 ], cb_row_Q7[ 0 ] );
        sum1_Q15 = silk_SMLAWB( sum1_Q15,        sum2_Q24,  cb_row_Q7[ 0 ] );

        /* second row of XX_Q17 */
        sum2_Q24 = silk_MLA( neg_xX_Q24[ 1 ], XX_Q17[  7 ], cb_row_Q7[ 2 ] );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[  8 ], cb_row_Q7[ 3 ] );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[  9 ], cb_row_Q7[ 4 ] );
        sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[  6 ], cb_row_Q7[ 1 ] );
        sum1_Q15 = silk_SMLAWB( sum1_Q15,        sum2_Q24,  cb_row_Q7[ 1 ] );

        /* third row of XX_Q17 */
        sum2_Q24 = silk_MLA( neg_xX_Q24[ 2 ], XX_Q17[ 13 ], cb_row_Q7[ 3 ] );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[ 14 ], cb_row_Q7[ 4 ] );
        sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[ 12 ], cb_row_Q7[ 2 ] );
        sum1_Q15 = silk_SMLAWB( sum1_Q15,        sum2_Q24,  cb_row_Q7[ 2 ] );

        /* fourth row of XX_Q17 */
        sum2_Q24 = silk_MLA( neg_xX_Q24[ 3 ], XX_Q17[ 19 ], cb_row_Q7[ 4 ] );
        sum2_Q24 = silk_LSHIFT32( sum2_Q24, 1 );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[ 18 ], cb_row_Q7[ 3 ] );
        sum1_Q15 = silk_SMLAWB( sum1_Q15,        sum2_Q24,  cb_row_Q7[ 3 ] );

        /* last row of XX_Q17 */
        sum2_Q24 = silk_LSHIFT32( neg_xX_Q24[ 4 ], 1 );
        sum2_Q24 = silk_MLA( sum2_Q24,        XX_Q17[ 24 ], cb_row_Q7[ 4 ] );
        sum1_Q15 = silk_SMLAWB( sum1_Q15,        sum2_Q24,  cb_row_Q7[ 4 ] );

        /* find best */
        if( sum1_Q15 >= 0 ) {
            /* Translate residual energy to bits using high-rate assumption (6 dB ==> 1 bit/sample) */
            bits_res_Q8 = silk_SMULBB( subfr_len, silk_lin2log( sum1_Q15 + penalty) - (15 << 7) );
            /* In the following line we reduce the codelength component by half ("-1"); seems to slightly improve quality */
            bits_tot_Q8 = silk_ADD_LSHIFT32( bits_res_Q8, cl_Q5[ k ], 3-1 );
            if( bits_tot_Q8 <= *rate_dist_Q8 ) {
                *rate_dist_Q8 = bits_tot_Q8;
                *res_nrg_Q15 = sum1_Q15 + penalty;
                *ind = (opus_int8)k;
                *gain_Q7 = gain_tmp_Q7;
            }
        }

        /* Go to next cbk vector */
        cb_row_Q7 += LTP_ORDER;
    }

#ifdef OPUS_CHECK_ASM
    {
        opus_int8  ind_c = 0;
        opus_int32 res_nrg_Q15_c = 0;
        opus_int32 rate_dist_Q8_c = 0;
        opus_int   gain_Q7_c = 0;

        silk_VQ_WMat_EC_c(
            &ind_c,
            &res_nrg_Q15_c,
            &rate_dist_Q8_c,
            &gain_Q7_c,
            XX_Q17,
            xX_Q17,
            cb_Q7,
            cb_gain_Q7,
            cl_Q5,
            subfr_len,
            max_gain_Q7,
            L
        );

        silk_assert( *ind == ind_c );
        silk_assert( *res_nrg_Q15 == res_nrg_Q15_c );
        silk_assert( *rate_dist_Q8 == rate_dist_Q8_c );
        silk_assert( *gain_Q7 == gain_Q7_c );
    }
#endif
}