ref: 310af750eb5726b4143a43208f2bc03677c6f5db
dir: /silk/SKP_Silk_encode_frame_FLP.c/
/***********************************************************************
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***********************************************************************/
#include "SKP_Silk_main_FLP.h"
#include "SKP_Silk_tuning_parameters.h"
/****************/
/* Encode frame */
/****************/
SKP_int SKP_Silk_encode_frame_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_int32 *pnBytesOut, /* O Number of payload bytes */
ec_enc *psRangeEnc /* I/O compressor data structure */
)
{
SKP_Silk_encoder_control_FLP sEncCtrl;
SKP_int i, ret = 0;
SKP_float *x_frame, *res_pitch_frame;
SKP_int16 pIn_HP[ MAX_FRAME_LENGTH ];
SKP_float xfw[ MAX_FRAME_LENGTH ];
SKP_float 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 = SKP_Silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf );
TOC(VAD)
/**************************************************/
/* Convert speech activity into VAD and DTX flags */
/**************************************************/
if( psEnc->sCmn.nFramesAnalyzed == 0 ) {
psEnc->sCmn.inDTX = psEnc->sCmn.useDTX;
}
if( psEnc->sCmn.speech_activity_Q8 < SKP_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.nFramesAnalyzed ] = 0;
} else {
psEnc->sCmn.noSpeechCounter = 0;
psEnc->sCmn.inDTX = 0;
psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesAnalyzed ] = 1;
}
/*******************************************/
/* High-pass filtering of the input signal */
/*******************************************/
TIC(HP_IN)
SKP_Silk_HP_variable_cutoff( &psEnc->sCmn, pIn_HP, psEnc->sCmn.inputBuf, psEnc->sCmn.frame_length );
TOC(HP_IN)
/* Ensure smooth bandwidth transitions */
SKP_Silk_LP_variable_cutoff( &psEnc->sCmn.sLP, pIn_HP, psEnc->sCmn.frame_length );
/*******************************************/
/* Copy new frame to front of input buffer */
/*******************************************/
SKP_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, pIn_HP, psEnc->sCmn.frame_length );
/* Add tiny signal to avoid high CPU load from denormalized floating point numbers */
for( i = 0; i < 8; i++ ) {
x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f;
}
/*****************************************/
/* Find pitch lags, initial LPC analysis */
/*****************************************/
TIC(FIND_PITCH)
SKP_Silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PITCH)
/************************/
/* Noise shape analysis */
/************************/
TIC(NOISE_SHAPE_ANALYSIS)
SKP_Silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
TOC(NOISE_SHAPE_ANALYSIS)
/*****************************************/
/* Prefiltering for noise shaper */
/*****************************************/
TIC(PREFILTER)
SKP_Silk_prefilter_FLP( psEnc, &sEncCtrl, xfw, x_frame );
TOC(PREFILTER)
/***************************************************/
/* Find linear prediction coefficients (LPC + LTP) */
/***************************************************/
TIC(FIND_PRED_COEF)
SKP_Silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch, x_frame );
TOC(FIND_PRED_COEF)
/****************************************/
/* Process gains */
/****************************************/
TIC(PROCESS_GAINS)
SKP_Silk_process_gains_FLP( psEnc, &sEncCtrl );
TOC(PROCESS_GAINS)
/****************************************/
/* Low Bitrate Redundant Encoding */
/****************************************/
TIC(LBRR)
SKP_Silk_LBRR_encode_FLP( psEnc, &sEncCtrl, xfw );
TOC(LBRR)
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
TIC(NSQ)
SKP_Silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, xfw );
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( SKP_float ) );
/* 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)
SKP_Silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesAnalyzed, 0 );
TOC(ENCODE_PARAMS)
/****************************************/
/* Encode Excitation Signal */
/****************************************/
TIC(ENCODE_PULSES)
SKP_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.nFramesAnalyzed >= psEnc->sCmn.nFramesPerPacket ) {
/* Payload size */
*pnBytesOut = SKP_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
/* Reset the number of frames in payload buffer */
psEnc->sCmn.nFramesAnalyzed = 0;
} else {
/* No payload this time */
*pnBytesOut = 0;
}
TOC(ENCODE_FRAME)
#ifdef SAVE_ALL_INTERNAL_DATA
//DEBUG_STORE_DATA( xf.dat, pIn_HP_LP, psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
//DEBUG_STORE_DATA( xfw.dat, xfw, psEnc->sCmn.frame_length * sizeof( SKP_float ) );
DEBUG_STORE_DATA( pitchL.dat, sEncCtrl.pitchL, MAX_NB_SUBFR * sizeof( SKP_int ) );
DEBUG_STORE_DATA( pitchG_quantized.dat, sEncCtrl.LTPCoef, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( SKP_float ) );
DEBUG_STORE_DATA( LTPcorr.dat, &psEnc->LTPCorr, sizeof( SKP_float ) );
DEBUG_STORE_DATA( gains.dat, sEncCtrl.Gains, psEnc->sCmn.nb_subfr * sizeof( SKP_float ) );
DEBUG_STORE_DATA( gains_indices.dat, &psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr * sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( quantOffsetType.dat, &psEnc->sCmn.indices.quantOffsetType, sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( speech_activity_q8.dat, &psEnc->sCmn.speech_activity_Q8, sizeof( SKP_int ) );
DEBUG_STORE_DATA( signalType.dat, &psEnc->sCmn.indices.signalType, sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( lag_index.dat, &psEnc->sCmn.indices.lagIndex, sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( contour_index.dat, &psEnc->sCmn.indices.contourIndex, sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( per_index.dat, &psEnc->sCmn.indices.PERIndex, sizeof( SKP_int8 ) );
DEBUG_STORE_DATA( PredCoef.dat, &sEncCtrl.PredCoef[ 1 ], psEnc->sCmn.predictLPCOrder * sizeof( SKP_float ) );
DEBUG_STORE_DATA( ltp_scale_idx.dat, &psEnc->sCmn.indices.LTP_scaleIndex, sizeof( SKP_int8 ) );
// DEBUG_STORE_DATA( xq.dat, psEnc->sCmn.sNSQ.xqBuf, psEnc->sCmn.frame_length * sizeof( SKP_float ) );
#endif
return ret;
}
/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */
void SKP_Silk_LBRR_encode_FLP(
SKP_Silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
SKP_Silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
const SKP_float xfw[] /* I Input signal */
)
{
SKP_int k;
SKP_int32 Gains_Q16[ MAX_NB_SUBFR ];
SKP_float TempGains[ MAX_NB_SUBFR ];
SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesAnalyzed ];
SKP_Silk_nsq_state sNSQ_LBRR;
/*******************************************/
/* Control use of inband LBRR */
/*******************************************/
if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SKP_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesAnalyzed ] = 1;
/* Copy noise shaping quantizer state and quantization indices from regular encoding */
SKP_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( SKP_Silk_nsq_state ) );
SKP_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
/* Save original gains */
SKP_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( SKP_float ) );
if( psEnc->sCmn.nFramesAnalyzed == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesAnalyzed - 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 ] += 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 */
SKP_Silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
&psEnc->sCmn.LBRRprevLastGainIndex, psEnc->sCmn.nFramesAnalyzed, psEnc->sCmn.nb_subfr );
/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
psEncCtrl->Gains[ k ] = Gains_Q16[ k ] / 65536.0f;
}
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
SKP_Silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR,
psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesAnalyzed ], xfw );
/* Restore original gains */
SKP_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( SKP_float ) );
}
}