ref: 606cc10f2f7d76046a25fde5ec5e0a35dafdaae6
dir: /src_FLP/SKP_Silk_control_codec_FLP.c/
/***********************************************************************
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are permitted provided that the following conditions are met:
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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***********************************************************************/
#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_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_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 packet size */
if( PacketSize_ms != psEnc->sCmn.PacketSize_ms ) {
if( ( PacketSize_ms != 10 ) &&
( PacketSize_ms != 20 ) &&
( PacketSize_ms != 40 ) &&
( PacketSize_ms != 60 ) ) {
ret = SKP_SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
}
if( PacketSize_ms == 10 ) {
/* Only allowed when the payload buffer is empty */
psEnc->sCmn.nb_subfr = MAX_NB_SUBFR >> 1;
psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
} else {
psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
}
/* Packet length changes. Reset LBRR buffer */
SKP_Silk_LBRR_reset( &psEnc->sCmn );
psEnc->sCmn.PacketSize_ms = PacketSize_ms;
}
/* 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;
if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ){
psEnc->sCmn.pitch_contour_iCDF = SKP_Silk_pitch_contour_NB_iCDF;
} else if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR / 2 ){
psEnc->sCmn.pitch_contour_iCDF = SKP_Silk_pitch_contour_10_ms_NB_iCDF;
} else {
/* Unsupported number of frames */
SKP_assert( 0 );
}
} 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;
if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ){
psEnc->sCmn.pitch_contour_iCDF = SKP_Silk_pitch_contour_iCDF;
} else if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR / 2 ){
psEnc->sCmn.pitch_contour_iCDF = SKP_Silk_pitch_contour_10_ms_iCDF;
} else {
/* Unsupported number of frames */
SKP_assert( 0 );
}
}
psEnc->sCmn.subfr_length = SUB_FRAME_LENGTH_MS * fs_kHz;
psEnc->sCmn.frame_length = psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr;
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 if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR / 2 ){
psEnc->sPred.pitch_LPC_win_length = SKP_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
} else {
/* Unsupported number of frames */
SKP_assert( 0 );
}
if( psEnc->sCmn.fs_kHz == 24 ) {
psEnc->sCmn.mu_LTP_Q10 = SKP_FIX_CONST( MU_LTP_QUANT_SWB, 10 );
psEnc->sCmn.bitrate_threshold_up = SKP_int32_MAX;
psEnc->sCmn.bitrate_threshold_down = SWB2WB_BITRATE_BPS;
psEnc->sCmn.pitch_lag_low_bits_iCDF = SKP_Silk_uniform12_iCDF;
} else if( psEnc->sCmn.fs_kHz == 16 ) {
psEnc->sCmn.mu_LTP_Q10 = SKP_FIX_CONST( MU_LTP_QUANT_WB, 10 );
psEnc->sCmn.bitrate_threshold_up = WB2SWB_BITRATE_BPS;
psEnc->sCmn.bitrate_threshold_down = WB2MB_BITRATE_BPS;
psEnc->sCmn.pitch_lag_low_bits_iCDF = SKP_Silk_uniform8_iCDF;
} else if( psEnc->sCmn.fs_kHz == 12 ) {
psEnc->sCmn.mu_LTP_Q10 = SKP_FIX_CONST( MU_LTP_QUANT_MB, 10 );
psEnc->sCmn.bitrate_threshold_up = MB2WB_BITRATE_BPS;
psEnc->sCmn.bitrate_threshold_down = MB2NB_BITRATE_BPS;
psEnc->sCmn.pitch_lag_low_bits_iCDF = SKP_Silk_uniform6_iCDF;
} else if( psEnc->sCmn.fs_kHz == 8 ) {
psEnc->sCmn.mu_LTP_Q10 = SKP_FIX_CONST( MU_LTP_QUANT_NB, 10 );
psEnc->sCmn.bitrate_threshold_up = NB2MB_BITRATE_BPS;
psEnc->sCmn.bitrate_threshold_down = 0;
psEnc->sCmn.pitch_lag_low_bits_iCDF = SKP_Silk_uniform4_iCDF;
} else {
/* unsupported sampling rate */
SKP_assert( 0 );
}
psEnc->sCmn.fs_kHz_changed = 1;
}
/* 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_uint16 *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;
}