gecko/media/libopus/silk/stereo_encode_pred.c

/***********************************************************************
Copyright (c) 2006-2012 IETF Trust and Skype Limited. All rights reserved.

This file is extracted from RFC6716. Please see that RFC for additional
information.

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***********************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "main.h"

/* Entropy code the mid/side quantization indices */
void silk_stereo_encode_pred(
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int8                   ix[ 2 ][ 3 ]                    /* I    Quantization indices                        */
)
{
    opus_int   n;

    /* Entropy coding */
    n = 5 * ix[ 0 ][ 2 ] + ix[ 1 ][ 2 ];
    silk_assert( n < 25 );
    ec_enc_icdf( psRangeEnc, n, silk_stereo_pred_joint_iCDF, 8 );
    for( n = 0; n < 2; n++ ) {
        silk_assert( ix[ n ][ 0 ] < 3 );
        silk_assert( ix[ n ][ 1 ] < STEREO_QUANT_SUB_STEPS );
        ec_enc_icdf( psRangeEnc, ix[ n ][ 0 ], silk_uniform3_iCDF, 8 );
        ec_enc_icdf( psRangeEnc, ix[ n ][ 1 ], silk_uniform5_iCDF, 8 );
    }
}

/* Entropy code the mid-only flag */
void silk_stereo_encode_mid_only(
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int8                   mid_only_flag
)
{
    /* Encode flag that only mid channel is coded */
    ec_enc_icdf( psRangeEnc, mid_only_flag, silk_stereo_only_code_mid_iCDF, 8 );
}