path: root/src_FLP/SKP_Silk_control_codec_FLP.c

/***********************************************************************
Copyright (c) 2006-2010, Skype Limited. All rights reserved. 
Redistribution and use in source and binary forms, with or without 
modification, (subject to the limitations in the disclaimer below) 
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 Skype Limited, nor the names of specific 
contributors, may be used to endorse or promote products derived from 
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 
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.
***********************************************************************/

#include "SKP_Silk_main_FLP.h"
#include "SKP_Silk_setup_complexity.h"

SKP_INLINE SKP_int SKP_Silk_setup_resamplers(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Pointer to Silk encoder state FLP       */
    SKP_int                         fs_kHz              /* I    Internal sampling rate (kHz)            */
);

SKP_INLINE SKP_int SKP_Silk_setup_packetsize(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Pointer to Silk encoder state FLP       */
    SKP_int                         PacketSize_ms       /* I    Packet length (ms)                      */
);

SKP_INLINE SKP_int SKP_Silk_setup_fs(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O                      */
    SKP_int                         fs_kHz,             /* I                        */
    SKP_int                         PacketSize_ms       /* I                        */
);

SKP_INLINE SKP_int SKP_Silk_setup_rate(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Pointer to Silk encoder state FLP       */
    SKP_int                         TargetRate_bps      /* I    Target max bitrate                      */
);

SKP_INLINE SKP_int SKP_Silk_setup_LBRR(
    SKP_Silk_encoder_state_FLP      *psEnc              /* I/O  Pointer to Silk encoder state FLP       */
);

/* Control encoder */
SKP_int SKP_Silk_control_encoder_FLP( 
    SKP_Silk_encoder_state_FLP  *psEnc,                 /* I/O  Pointer to Silk encoder state FLP       */
    const SKP_int               PacketSize_ms,          /* I    Packet length (ms)                      */
    const SKP_int32             TargetRate_bps,         /* I    Target max bitrate (bps)                */
    const SKP_int               PacketLoss_perc,        /* I    Packet loss rate (in percent)           */
    const SKP_int               Complexity              /* I    Complexity (0->low; 1->medium; 2->high) */
)
{
    SKP_int   fs_kHz, ret = 0;

    if( psEnc->sCmn.controlled_since_last_payload != 0 ) {
        if( psEnc->sCmn.API_fs_Hz != psEnc->sCmn.prev_API_fs_Hz && psEnc->sCmn.fs_kHz > 0 ) {
            /* Change in API sampling rate in the middle of encoding a packet */
            ret += SKP_Silk_setup_resamplers( psEnc, psEnc->sCmn.fs_kHz );
        }
        return ret;
    }

    /* Beyond this point we know that there are no previously coded frames in the payload buffer */

    /********************************************/
    /* Determine internal sampling rate         */
    /********************************************/
    fs_kHz = SKP_Silk_control_audio_bandwidth( &psEnc->sCmn, TargetRate_bps );

    /********************************************/
    /* Prepare resampler and buffered data      */
    /********************************************/
    ret += SKP_Silk_setup_resamplers( psEnc, fs_kHz );

    /********************************************/
    /* Set internal sampling frequency          */
    /********************************************/
    ret += SKP_Silk_setup_fs( psEnc, fs_kHz, PacketSize_ms );

    /********************************************/
    /* Set encoding complexity                  */
    /********************************************/
    ret += SKP_Silk_setup_complexity( &psEnc->sCmn, Complexity );

    /********************************************/
    /* Set bitrate/coding quality               */
    /********************************************/
    ret += SKP_Silk_setup_rate( psEnc, TargetRate_bps );

    /********************************************/
    /* Set packet loss rate measured by farend  */
    /********************************************/
    if( ( PacketLoss_perc < 0 ) || ( PacketLoss_perc > 100 ) ) {
        ret = SKP_SILK_ENC_INVALID_LOSS_RATE;
    }
    psEnc->sCmn.PacketLoss_perc = PacketLoss_perc;

    /********************************************/
    /* Set LBRR usage                           */
    /********************************************/
    ret += SKP_Silk_setup_LBRR( psEnc );

    psEnc->sCmn.controlled_since_last_payload = 1;

    return ret;
}

/* Control low bitrate redundancy usage */
void SKP_Silk_LBRR_ctrl_FLP(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I    Encoder state FLP                       */
    SKP_Silk_encoder_control        *psEncCtrlC         /* I/O  Encoder control                         */
)
{
    SKP_int LBRR_usage;

    if( psEnc->sCmn.LBRR_enabled ) {
        /* Control LBRR */

        /* Usage Control based on sensitivity and packet loss caracteristics */
        /* For now only enable adding to next for active frames. Make more complex later */
        LBRR_usage = SKP_SILK_NO_LBRR;
        if( psEnc->speech_activity > LBRR_SPEECH_ACTIVITY_THRES && psEnc->sCmn.PacketLoss_perc > LBRR_LOSS_THRES ) {
            LBRR_usage = SKP_SILK_LBRR;
        }
        psEncCtrlC->LBRR_usage = LBRR_usage;
    } else {
        psEncCtrlC->LBRR_usage = SKP_SILK_NO_LBRR;
    }
}

SKP_INLINE SKP_int SKP_Silk_setup_packetsize(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O                      */
    SKP_int                         PacketSize_ms       /* I                        */
)
{
    SKP_int ret = SKP_SILK_NO_ERROR;
    if( ( PacketSize_ms !=  10 ) &&
        ( PacketSize_ms !=  20 ) &&
        ( PacketSize_ms !=  40 ) && 
        ( PacketSize_ms !=  60 ) ) {
        ret = SKP_SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
    } else {
        if( PacketSize_ms != psEnc->sCmn.PacketSize_ms ) {
            if( PacketSize_ms == 10 ) {
                /* Only allowed when the payload buffer is empty */
                psEnc->sCmn.nb_subfr = MAX_NB_SUBFR >> 1;
                psEnc->sCmn.PacketSize_ms = PacketSize_ms;
                psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, psEnc->sCmn.fs_kHz );
                /* Packet length changes. Reset LBRR buffer */
                SKP_Silk_LBRR_reset( &psEnc->sCmn );
            } else{
                psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
                psEnc->sCmn.PacketSize_ms = PacketSize_ms;
                psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS, psEnc->sCmn.fs_kHz );
                /* Packet length changes. Reset LBRR buffer */
                SKP_Silk_LBRR_reset( &psEnc->sCmn );
            }
        }
        psEnc->sCmn.frame_length = SKP_SMULBB( psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
    }

    return(ret);
}

SKP_INLINE SKP_int SKP_Silk_setup_resamplers(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Pointer to Silk encoder state FLP       */
    SKP_int                         fs_kHz              /* I    External (API) sampling rate (Hz)       */
)
{
    SKP_int ret = SKP_SILK_NO_ERROR;
    
    if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz ) {

        if( psEnc->sCmn.fs_kHz == 0 ) {
            /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
            ret += SKP_Silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000 );
        } else {
            /* Allocate space for worst case temporary upsampling, 8 to 48 kHz, so a factor 6 */
            SKP_int16 x_buf_API_fs_Hz[ ( 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ) * ( MAX_API_FS_KHZ / 8 ) ];
            SKP_int16 x_bufFIX[          2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ]; 

            SKP_int32 nSamples_temp = 2 * psEnc->sCmn.frame_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz;

            SKP_float2short_array( x_bufFIX, psEnc->x_buf, nSamples_temp );

            if( fs_kHz * 1000 < psEnc->sCmn.API_fs_Hz && psEnc->sCmn.fs_kHz != 0 ) {
                /* Resample buffered data in x_buf to API_fs_Hz */

                SKP_Silk_resampler_state_struct  temp_resampler_state;

                /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */
                ret += SKP_Silk_resampler_init( &temp_resampler_state, psEnc->sCmn.fs_kHz * 1000, psEnc->sCmn.API_fs_Hz );

                /* Temporary resampling of x_buf data to API_fs_Hz */
                ret += SKP_Silk_resampler( &temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, nSamples_temp );

                /* Calculate number of samples that has been temporarily upsampled */
                nSamples_temp = SKP_DIV32_16( nSamples_temp * psEnc->sCmn.API_fs_Hz, psEnc->sCmn.fs_kHz * 1000 );

                /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
                ret += SKP_Silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000 );

            } else {
                /* Copy data */
                SKP_memcpy( x_buf_API_fs_Hz, x_bufFIX, nSamples_temp * sizeof( SKP_int16 ) );
            }

            if( 1000 * fs_kHz != psEnc->sCmn.API_fs_Hz ) {
                /* Correct resampler state (unless resampling by a factor 1) by resampling buffered data from API_fs_Hz to fs_kHz */
                ret += SKP_Silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, nSamples_temp );
            }
            SKP_short2float_array( psEnc->x_buf, x_bufFIX, ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * fs_kHz );
        }
    }

    psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz;

    return(ret);
}

SKP_INLINE SKP_int SKP_Silk_setup_fs(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O                      */
    SKP_int                         fs_kHz,             /* I                        */
    SKP_int                         PacketSize_ms       /* I                        */
)
{
    SKP_int ret = SKP_SILK_NO_ERROR;

    /* Set internal sampling frequency */
    if( psEnc->sCmn.fs_kHz != fs_kHz ) {
        /* reset part of the state */
        SKP_memset( &psEnc->sShape,          0,                            sizeof( SKP_Silk_shape_state_FLP ) );
        SKP_memset( &psEnc->sPrefilt,        0,                            sizeof( SKP_Silk_prefilter_state_FLP ) );
        SKP_memset( &psEnc->sNSQ,            0,                            sizeof( SKP_Silk_nsq_state ) );
        SKP_memset( &psEnc->sPred,           0,                            sizeof( SKP_Silk_predict_state_FLP ) );
        SKP_memset( psEnc->sNSQ.xq,          0, ( 2 * MAX_FRAME_LENGTH ) * sizeof( SKP_int16 ) );
        SKP_memset( psEnc->sNSQ_LBRR.xq,     0, ( 2 * MAX_FRAME_LENGTH ) * sizeof( SKP_int16 ) );
        SKP_memset( psEnc->sCmn.LBRR_buffer, 0,           MAX_LBRR_DELAY * sizeof( SKP_SILK_LBRR_struct ) );
#if SWITCH_TRANSITION_FILTERING
        SKP_memset( psEnc->sCmn.sLP.In_LP_State, 0, 2 * sizeof( SKP_int32 ) );
        if( psEnc->sCmn.sLP.mode == 1 ) {
            /* Begin transition phase */
            psEnc->sCmn.sLP.transition_frame_no = 1;
        } else {
            /* End transition phase */
            psEnc->sCmn.sLP.transition_frame_no = 0;
        }
#endif
        psEnc->sCmn.inputBufIx          = 0;
        psEnc->sCmn.nFramesInPayloadBuf = 0;
        psEnc->sCmn.nBytesInPayloadBuf  = 0;
        psEnc->sCmn.oldest_LBRR_idx     = 0;
        psEnc->sCmn.TargetRate_bps      = 0; /* Ensures that psEnc->SNR_dB is recomputed */

        SKP_memset( psEnc->sPred.prev_NLSFq, 0, MAX_LPC_ORDER * sizeof( SKP_float ) );

        /* Initialize non-zero parameters */
        psEnc->sCmn.prevLag                 = 100;
        psEnc->sCmn.prev_sigtype            = SIG_TYPE_UNVOICED;
        psEnc->sCmn.first_frame_after_reset = 1;
        psEnc->sPrefilt.lagPrev             = 100;
        psEnc->sShape.LastGainIndex         = 1;
        psEnc->sNSQ.lagPrev                 = 100;
        psEnc->sNSQ.prev_inv_gain_Q16       = 65536;
        psEnc->sNSQ_LBRR.prev_inv_gain_Q16  = 65536;

        psEnc->sCmn.fs_kHz = fs_kHz;
        if( psEnc->sCmn.fs_kHz == 8 ) {
            psEnc->sCmn.predictLPCOrder = MIN_LPC_ORDER;
            psEnc->sCmn.psNLSF_CB[ 0 ]  = &SKP_Silk_NLSF_CB0_10;
            psEnc->sCmn.psNLSF_CB[ 1 ]  = &SKP_Silk_NLSF_CB1_10;
            psEnc->psNLSF_CB_FLP[  0 ]  = &SKP_Silk_NLSF_CB0_10_FLP;
            psEnc->psNLSF_CB_FLP[  1 ]  = &SKP_Silk_NLSF_CB1_10_FLP;
        } else {
            psEnc->sCmn.predictLPCOrder = MAX_LPC_ORDER;
            psEnc->sCmn.psNLSF_CB[ 0 ]  = &SKP_Silk_NLSF_CB0_16;
            psEnc->sCmn.psNLSF_CB[ 1 ]  = &SKP_Silk_NLSF_CB1_16;
            psEnc->psNLSF_CB_FLP[  0 ]  = &SKP_Silk_NLSF_CB0_16_FLP;
            psEnc->psNLSF_CB_FLP[  1 ]  = &SKP_Silk_NLSF_CB1_16_FLP;
        }
        psEnc->sCmn.subfr_length   = SUB_FRAME_LENGTH_MS * fs_kHz;
        psEnc->sCmn.ltp_mem_length = LTP_MEM_LENGTH_MS * fs_kHz; 
        psEnc->sCmn.la_pitch       = LA_PITCH_MS * fs_kHz;
        psEnc->sPred.min_pitch_lag =  3 * fs_kHz;
        psEnc->sPred.max_pitch_lag = 18 * fs_kHz;
        if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ){
            psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
        } else {
            psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
        }
        if( psEnc->sCmn.fs_kHz == 24 ) {
            psEnc->mu_LTP = MU_LTP_QUANT_SWB;
            psEnc->sCmn.bitrate_threshold_up   = SKP_int32_MAX;
            psEnc->sCmn.bitrate_threshold_down = SWB2WB_BITRATE_BPS; 
        } else if( psEnc->sCmn.fs_kHz == 16 ) {
            psEnc->mu_LTP = MU_LTP_QUANT_WB;
            psEnc->sCmn.bitrate_threshold_up   = WB2SWB_BITRATE_BPS;
            psEnc->sCmn.bitrate_threshold_down = WB2MB_BITRATE_BPS; 
        } else if( psEnc->sCmn.fs_kHz == 12 ) {
            psEnc->mu_LTP = MU_LTP_QUANT_MB;
            psEnc->sCmn.bitrate_threshold_up   = MB2WB_BITRATE_BPS;
            psEnc->sCmn.bitrate_threshold_down = MB2NB_BITRATE_BPS;
        } else {
            psEnc->mu_LTP = MU_LTP_QUANT_NB;
            psEnc->sCmn.bitrate_threshold_up   = NB2MB_BITRATE_BPS;
            psEnc->sCmn.bitrate_threshold_down = 0;
        }
        psEnc->sCmn.fs_kHz_changed = 1;
    }

    /********************************************/
    /* Set packet size                          */
    /********************************************/
    ret += SKP_Silk_setup_packetsize( psEnc, PacketSize_ms );

    /* Check that settings are valid */
    SKP_assert( ( psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr ) == psEnc->sCmn.frame_length );
 
    return( ret );
}

SKP_INLINE SKP_int SKP_Silk_setup_rate(
    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Pointer to Silk encoder state FLP       */
    SKP_int                         TargetRate_bps      /* I    Target max bitrate                      */
)
{
    SKP_int k, ret = SKP_SILK_NO_ERROR;
    SKP_float frac;
    const SKP_int32 *rateTable;

    /* Set bitrate/coding quality */
    if( TargetRate_bps != psEnc->sCmn.TargetRate_bps ) {
        psEnc->sCmn.TargetRate_bps = TargetRate_bps;

        /* If new TargetRate_bps, translate to SNR_dB value */
        if( psEnc->sCmn.fs_kHz == 8 ) {
            rateTable = TargetRate_table_NB;
        } else if( psEnc->sCmn.fs_kHz == 12 ) {
            rateTable = TargetRate_table_MB;
        } else if( psEnc->sCmn.fs_kHz == 16 ) {
            rateTable = TargetRate_table_WB;
        } else {
            rateTable = TargetRate_table_SWB;
        }
        for( k = 1; k < TARGET_RATE_TAB_SZ; k++ ) {
            /* Find bitrate interval in table and interpolate */
            if( TargetRate_bps < rateTable[ k ] ) {
                frac = (SKP_float)( TargetRate_bps - rateTable[ k - 1 ] ) / 
                       (SKP_float)( rateTable[ k ] - rateTable[ k - 1 ] );
                psEnc->SNR_dB = 0.5f * ( SNR_table_Q1[ k - 1 ] + frac * ( SNR_table_Q1[ k ] - SNR_table_Q1[ k - 1 ] ) );
                break;
            }
        }
    }
    return( ret );
}

SKP_INLINE SKP_int SKP_Silk_setup_LBRR(
    SKP_Silk_encoder_state_FLP      *psEnc              /* I/O  Pointer to Silk encoder state FLP       */
)
{
    SKP_int   ret = SKP_SILK_NO_ERROR;

#if USE_LBRR
    SKP_int32 LBRRRate_thres_bps;

    if( psEnc->sCmn.useInBandFEC < 0 || psEnc->sCmn.useInBandFEC > 1 ) {
        ret = SKP_SILK_ENC_INVALID_INBAND_FEC_SETTING;
    }
    
    psEnc->sCmn.LBRR_enabled = psEnc->sCmn.useInBandFEC;
    if( psEnc->sCmn.fs_kHz == 8 ) {
        LBRRRate_thres_bps = INBAND_FEC_MIN_RATE_BPS - 9000;
    } else if( psEnc->sCmn.fs_kHz == 12 ) {
        LBRRRate_thres_bps = INBAND_FEC_MIN_RATE_BPS - 6000;;
    } else if( psEnc->sCmn.fs_kHz == 16 ) {
        LBRRRate_thres_bps = INBAND_FEC_MIN_RATE_BPS - 3000;
    } else {
        LBRRRate_thres_bps = INBAND_FEC_MIN_RATE_BPS;
    }

    if( psEnc->sCmn.TargetRate_bps >= LBRRRate_thres_bps ) {
        /* Set gain increase / rate reduction for LBRR usage */
        /* Coarsely tuned with PESQ for now. */
        /* Linear regression coefs G = 8 - 0.5 * loss */
        /* Meaning that at 16% loss main rate and redundant rate is the same, -> G = 0 */
        psEnc->sCmn.LBRR_GainIncreases = SKP_max_int( 8 - SKP_RSHIFT( psEnc->sCmn.PacketLoss_perc, 1 ), 0 );

        /* Set main stream rate compensation */
        if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.PacketLoss_perc > LBRR_LOSS_THRES ) {
            /* Tuned to give approx same mean / weighted bitrate as no inband FEC */
            psEnc->inBandFEC_SNR_comp = 6.0f - 0.5f * psEnc->sCmn.LBRR_GainIncreases;
        } else {
            psEnc->inBandFEC_SNR_comp = 0;
            psEnc->sCmn.LBRR_enabled  = 0;
        }
    } else {
        psEnc->inBandFEC_SNR_comp     = 0;
        psEnc->sCmn.LBRR_enabled      = 0;
    }
#else
    if( psEnc->sCmn.LBRR_enabled != 0 ) {
        ret = SKP_SILK_ENC_INVALID_INBAND_FEC_SETTING;
        psEnc->sCmn.LBRR_enabled = 0;
    }
#endif
    return ret;
}