ref: 0ed6577500c8e388ed1957d6ee8216469164a38f
dir: /silk/fixed/silk_encode_frame_FIX.c/
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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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
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documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
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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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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
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include "silk_main_FIX.h"
#include "silk_tuning_parameters.h"
/****************/
/* Encode frame */
/****************/
SKP_int silk_encode_frame_FIX(
silk_encoder_state_FIX *psEnc, /* I/O Encoder state FIX */
SKP_int32 *pnBytesOut, /* O Number of payload bytes */
ec_enc *psRangeEnc /* I/O compressor data structure */
)
{
silk_encoder_control_FIX sEncCtrl;
SKP_int ret = 0;
SKP_int16 *x_frame, *res_pitch_frame;
SKP_int16 xfw[ MAX_FRAME_LENGTH ];
SKP_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( SKP_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( SKP_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( SKP_int16 ) );
DEBUG_STORE_DATA( xfw.dat, xfw, psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( pitchL.dat, sEncCtrl.pitchL, psEnc->sCmn.nb_subfr * sizeof( SKP_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( SKP_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( SKP_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( 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) );
}
#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 SKP_int16 xfw[] /* I Input signal */
)
{
SKP_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( SKP_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( SKP_int32 ) );
}
}