shithub: opus

ref: 9f555bc4e7c04ce8c2119979e0138a1a7ae9c2c4
dir: /silk/fixed/silk_encode_frame_FIX.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 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 Skype Limited, nor the names of specific
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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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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

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

#include "silk_main_FIX.h"
#include "silk_tuning_parameters.h"

/****************/
/* Encode frame */
/****************/
opus_int silk_encode_frame_FIX(
    silk_encoder_state_FIX          *psEnc,             /* I/O  Encoder state FIX                       */
    opus_int32                       *pnBytesOut,        /*   O  Number of payload bytes                 */
    ec_enc                          *psRangeEnc         /* I/O  compressor data structure               */
)
{
    silk_encoder_control_FIX sEncCtrl;
    opus_int     ret = 0;
    opus_int16   *x_frame, *res_pitch_frame;
    opus_int16   xfw[ MAX_FRAME_LENGTH ];
    opus_int16   res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];

TIC(ENCODE_FRAME)

    psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;

    /**************************************************************/
    /* Setup Input Pointers, and insert frame in input buffer    */
    /*************************************************************/
    /* pointers aligned with start of frame to encode */
    x_frame         = psEnc->x_buf + psEnc->sCmn.ltp_mem_length;    /* start of frame to encode */
    res_pitch_frame = res_pitch    + psEnc->sCmn.ltp_mem_length;    /* start of pitch LPC residual frame */

    /****************************/
    /* Voice Activity Detection */
    /****************************/
TIC(VAD)
    ret = silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf - 1 );
TOC(VAD)

    /**************************************************/
    /* Convert speech activity into VAD and DTX flags */
    /**************************************************/
    if( psEnc->sCmn.nFramesEncoded == 0 ) {
        psEnc->sCmn.inDTX = psEnc->sCmn.useDTX;
    }
    if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
        psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
        psEnc->sCmn.noSpeechCounter++;
        if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
            psEnc->sCmn.inDTX = 0;
        } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
            psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
            psEnc->sCmn.inDTX           = 0;
        }
        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
    } else {
        psEnc->sCmn.noSpeechCounter    = 0;
        psEnc->sCmn.inDTX              = 0;
        psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
    }

    /***************************************/
    /* Ensure smooth bandwidth transitions */
    /***************************************/
    silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf - 1, psEnc->sCmn.frame_length );

    /*******************************************/
    /* Copy new frame to front of input buffer */
    /*******************************************/
    SKP_memcpy( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf - 1, psEnc->sCmn.frame_length * sizeof( opus_int16 ) );

    /*****************************************/
    /* Find pitch lags, initial LPC analysis */
    /*****************************************/
TIC(FIND_PITCH)
    silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PITCH)

    /************************/
    /* Noise shape analysis */
    /************************/
TIC(NOISE_SHAPE_ANALYSIS)
    silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
TOC(NOISE_SHAPE_ANALYSIS)

    /***************************************************/
    /* Find linear prediction coefficients (LPC + LTP) */
    /***************************************************/
TIC(FIND_PRED_COEF)
    silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PRED_COEF)

    /****************************************/
    /* Process gains                        */
    /****************************************/
TIC(PROCESS_GAINS)
    silk_process_gains_FIX( psEnc, &sEncCtrl );
TOC(PROCESS_GAINS)

    /*****************************************/
    /* Prefiltering for noise shaper         */
    /*****************************************/
TIC(PREFILTER)
    silk_prefilter_FIX( psEnc, &sEncCtrl, xfw, x_frame );
TOC(PREFILTER)

    /****************************************/
    /* Low Bitrate Redundant Encoding       */
    /****************************************/
TIC(LBRR)
    silk_LBRR_encode_FIX( psEnc, &sEncCtrl, xfw );
TOC(LBRR)

    /*****************************************/
    /* Noise shaping quantization            */
    /*****************************************/
TIC(NSQ)
    if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
        silk_NSQ_del_dec( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw, psEnc->sCmn.pulses,
            sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
            sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
    } else {
        silk_NSQ( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw, psEnc->sCmn.pulses,
            sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
            sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
    }
TOC(NSQ)

    /* Update input buffer */
    SKP_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
        ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( opus_int16 ) );

    /* Parameters needed for next frame */
    psEnc->sCmn.prevLag        = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
    psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;

    /* Exit without entropy coding */
    if( psEnc->sCmn.prefillFlag ) {
        /* No payload */
        *pnBytesOut = 0;
        return ret;
    }

    /****************************************/
    /* Encode Parameters                    */
    /****************************************/
TIC(ENCODE_PARAMS)
    silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0 );
TOC(ENCODE_PARAMS)

    /****************************************/
    /* Encode Excitation Signal             */
    /****************************************/
TIC(ENCODE_PULSES)
    silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
        psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
TOC(ENCODE_PULSES)

    /****************************************/
    /* Finalize payload                     */
    /****************************************/
    psEnc->sCmn.first_frame_after_reset = 0;
    if( ++psEnc->sCmn.nFramesEncoded >= psEnc->sCmn.nFramesPerPacket ) {
        /* Payload size */
        *pnBytesOut = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );

        /* Reset the number of frames in payload buffer */
        psEnc->sCmn.nFramesEncoded = 0;
    } else {
        /* No payload this time */
        *pnBytesOut = 0;
    }
TOC(ENCODE_FRAME)

#ifdef SAVE_ALL_INTERNAL_DATA
    {
        SKP_float tmp[ MAX_NB_SUBFR * LTP_ORDER ];
        int i;
        DEBUG_STORE_DATA( xf.dat,                   x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.frame_length * sizeof( opus_int16 ) );
        DEBUG_STORE_DATA( xfw.dat,                  xfw,                            psEnc->sCmn.frame_length    * sizeof( opus_int16 ) );
        DEBUG_STORE_DATA( pitchL.dat,               sEncCtrl.pitchL,                psEnc->sCmn.nb_subfr        * sizeof( opus_int ) );
        for( i = 0; i < psEnc->sCmn.nb_subfr * LTP_ORDER; i++ ) {
            tmp[ i ] = (SKP_float)sEncCtrl.LTPCoef_Q14[ i ] / 16384.0f;
        }
        DEBUG_STORE_DATA( pitchG_quantized.dat,     tmp,                            psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( SKP_float ) );
        for( i = 0; i <psEnc->sCmn.predictLPCOrder; i++ ) {
            tmp[ i ] = (SKP_float)sEncCtrl.PredCoef_Q12[ 1 ][ i ] / 4096.0f;
        }
        DEBUG_STORE_DATA( PredCoef.dat,             tmp,                            psEnc->sCmn.predictLPCOrder * sizeof( SKP_float ) );

        tmp[ 0 ] = (SKP_float)sEncCtrl.LTPredCodGain_Q7 / 128.0f;
        DEBUG_STORE_DATA( LTPredCodGain.dat,        tmp,                            sizeof( SKP_float ) );
        tmp[ 0 ] = (SKP_float)psEnc->LTPCorr_Q15 / 32768.0f;
        DEBUG_STORE_DATA( LTPcorr.dat,              tmp,                            sizeof( SKP_float ) );
        tmp[ 0 ] = (SKP_float)psEnc->sCmn.input_tilt_Q15 / 32768.0f;
        DEBUG_STORE_DATA( tilt.dat,                 tmp,                            sizeof( SKP_float ) );
        for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
            tmp[ i ] = (SKP_float)sEncCtrl.Gains_Q16[ i ] / 65536.0f;
        }
        DEBUG_STORE_DATA( gains.dat,                tmp,                            psEnc->sCmn.nb_subfr * sizeof( SKP_float ) );
        DEBUG_STORE_DATA( gains_indices.dat,        &psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr * sizeof( opus_int ) );
        tmp[ 0 ] = (SKP_float)sEncCtrl.current_SNR_dB_Q7 / 128.0f;
        DEBUG_STORE_DATA( current_SNR_db.dat,       tmp,                            sizeof( SKP_float ) );
        DEBUG_STORE_DATA( quantOffsetType.dat,      &psEnc->sCmn.indices.quantOffsetType, sizeof( opus_int ) );
        tmp[ 0 ] = (SKP_float)psEnc->sCmn.speech_activity_Q8 / 256.0f;
        DEBUG_STORE_DATA( speech_activity.dat,      tmp,                            sizeof( SKP_float ) );
        for( i = 0; i < VAD_N_BANDS; i++ ) {
            tmp[ i ] = (SKP_float)psEnc->sCmn.input_quality_bands_Q15[ i ] / 32768.0f;
        }
        DEBUG_STORE_DATA( input_quality_bands.dat,  tmp,                       VAD_N_BANDS * sizeof( SKP_float ) );
        DEBUG_STORE_DATA( signalType.dat,           &psEnc->sCmn.indices.signalType,         sizeof( opus_int8) );
        DEBUG_STORE_DATA( lag_index.dat,            &psEnc->sCmn.indices.lagIndex,           sizeof( opus_int16 ) );
        DEBUG_STORE_DATA( contour_index.dat,        &psEnc->sCmn.indices.contourIndex,       sizeof( opus_int8 ) );
        DEBUG_STORE_DATA( per_index.dat,            &psEnc->sCmn.indices.PERIndex,           sizeof( opus_int8) );
    }
#endif
    return ret;
}

/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate  */
void silk_LBRR_encode_FIX(
    silk_encoder_state_FIX          *psEnc,         /* I/O  Pointer to Silk FIX encoder state           */
    silk_encoder_control_FIX        *psEncCtrl,     /* I/O  Pointer to Silk FIX encoder control struct  */
    const opus_int16                 xfw[]           /* I    Input signal                                */
)
{
    opus_int32   TempGains_Q16[ MAX_NB_SUBFR ];
    SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
    silk_nsq_state sNSQ_LBRR;

    /*******************************************/
    /* Control use of inband LBRR              */
    /*******************************************/
    if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
        psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;

        /* Copy noise shaping quantizer state and quantization indices from regular encoding */
        SKP_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
        SKP_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );

        /* Save original gains */
        SKP_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );

        if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
            /* First frame in packet or previous frame not LBRR coded */
            psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;

            /* Increase Gains to get target LBRR rate */
            psIndices_LBRR->GainsIndices[ 0 ] = psIndices_LBRR->GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases;
            psIndices_LBRR->GainsIndices[ 0 ] = SKP_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
        }

        /* Decode to get gains in sync with decoder         */
        /* Overwrite unquantized gains with quantized gains */
        silk_gains_dequant( psEncCtrl->Gains_Q16, psIndices_LBRR->GainsIndices,
            &psEnc->sCmn.LBRRprevLastGainIndex, psEnc->sCmn.nFramesEncoded, psEnc->sCmn.nb_subfr );

        /*****************************************/
        /* Noise shaping quantization            */
        /*****************************************/
        if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
            silk_NSQ_del_dec( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw,
                psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
                psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
                psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
        } else {
            silk_NSQ( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw,
                psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
                psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
                psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
        }

        /* Restore original gains */
        SKP_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
    }
}