/***********************************************************************
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are met:
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***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef FIXED_POINT
#include "main_FIX.h"
#define silk_encoder_state_Fxx silk_encoder_state_FIX
#else
#include "main_FLP.h"
#define silk_encoder_state_Fxx silk_encoder_state_FLP
#endif
#include "stack_alloc.h"
#include "tuning_parameters.h"
#include "pitch_est_defines.h"
static opus_int silk_setup_resamplers(
silk_encoder_state_Fxx *psEnc, /* I/O */
opus_int fs_kHz /* I */
);
static opus_int silk_setup_fs(
silk_encoder_state_Fxx *psEnc, /* I/O */
opus_int fs_kHz, /* I */
opus_int PacketSize_ms /* I */
);
static opus_int silk_setup_complexity(
silk_encoder_state *psEncC, /* I/O */
opus_int Complexity /* I */
);
static OPUS_INLINE opus_int silk_setup_LBRR(
silk_encoder_state *psEncC, /* I/O */
const silk_EncControlStruct *encControl /* I */
);
/* Control encoder */
opus_int silk_control_encoder(
silk_encoder_state_Fxx *psEnc, /* I/O Pointer to Silk encoder state */
silk_EncControlStruct *encControl, /* I Control structure */
const opus_int allow_bw_switch, /* I Flag to allow switching audio bandwidth */
const opus_int channelNb, /* I Channel number */
const opus_int force_fs_kHz
)
{
opus_int fs_kHz, ret = 0;
psEnc->sCmn.useDTX = encControl->useDTX;
psEnc->sCmn.useCBR = encControl->useCBR;
psEnc->sCmn.API_fs_Hz = encControl->API_sampleRate;
psEnc->sCmn.maxInternal_fs_Hz = encControl->maxInternalSampleRate;
psEnc->sCmn.minInternal_fs_Hz = encControl->minInternalSampleRate;
psEnc->sCmn.desiredInternal_fs_Hz = encControl->desiredInternalSampleRate;
psEnc->sCmn.useInBandFEC = encControl->useInBandFEC;
psEnc->sCmn.nChannelsAPI = encControl->nChannelsAPI;
psEnc->sCmn.nChannelsInternal = encControl->nChannelsInternal;
psEnc->sCmn.allow_bandwidth_switch = allow_bw_switch;
psEnc->sCmn.channelNb = channelNb;
if( psEnc->sCmn.controlled_since_last_payload != 0 && psEnc->sCmn.prefillFlag == 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 += 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 = silk_control_audio_bandwidth( &psEnc->sCmn, encControl );
if( force_fs_kHz ) {
fs_kHz = force_fs_kHz;
}
/********************************************/
/* Prepare resampler and buffered data */
/********************************************/
ret += silk_setup_resamplers( psEnc, fs_kHz );
/********************************************/
/* Set internal sampling frequency */
/********************************************/
ret += silk_setup_fs( psEnc, fs_kHz, encControl->payloadSize_ms );
/********************************************/
/* Set encoding complexity */
/********************************************/
ret += silk_setup_complexity( &psEnc->sCmn, encControl->complexity );
/********************************************/
/* Set packet loss rate measured by farend */
/********************************************/
psEnc->sCmn.PacketLoss_perc = encControl->packetLossPercentage;
/********************************************/
/* Set LBRR usage */
/********************************************/
ret += silk_setup_LBRR( &psEnc->sCmn, encControl );
psEnc->sCmn.controlled_since_last_payload = 1;
return ret;
}
static opus_int silk_setup_resamplers(
silk_encoder_state_Fxx *psEnc, /* I/O */
opus_int fs_kHz /* I */
)
{
opus_int ret = SILK_NO_ERROR;
SAVE_STACK;
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 += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000, 1 );
} else {
VARDECL( opus_int16, x_buf_API_fs_Hz );
VARDECL( silk_resampler_state_struct, temp_resampler_state );
#ifdef FIXED_POINT
opus_int16 *x_bufFIX = psEnc->x_buf;
#else
VARDECL( opus_int16, x_bufFIX );
opus_int32 new_buf_samples;
#endif
opus_int32 api_buf_samples;
opus_int32 old_buf_samples;
opus_int32 buf_length_ms;
buf_length_ms = silk_LSHIFT( psEnc->sCmn.nb_subfr * 5, 1 ) + LA_SHAPE_MS;
old_buf_samples = buf_length_ms * psEnc->sCmn.fs_kHz;
#ifndef FIXED_POINT
new_buf_samples = buf_length_ms * fs_kHz;
ALLOC( x_bufFIX, silk_max( old_buf_samples, new_buf_samples ),
opus_int16 );
silk_float2short_array( x_bufFIX, psEnc->x_buf, old_buf_samples );
#endif
/* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */
ALLOC( temp_resampler_state, 1, silk_resampler_state_struct );
ret += silk_resampler_init( temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz, 0 );
/* Calculate number of samples to temporarily upsample */
api_buf_samples = buf_length_ms * silk_DIV32_16( psEnc->sCmn.API_fs_Hz, 1000 );
/* Temporary resampling of x_buf data to API_fs_Hz */
ALLOC( x_buf_API_fs_Hz, api_buf_samples, opus_int16 );
ret += silk_resampler( temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, old_buf_samples );
/* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ), 1 );
/* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */
ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, api_buf_samples );
#ifndef FIXED_POINT
silk_short2float_array( psEnc->x_buf, x_bufFIX, new_buf_samples);
#endif
}
}
psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz;
RESTORE_STACK;
return ret;
}
static opus_int silk_setup_fs(
silk_encoder_state_Fxx *psEnc, /* I/O */
opus_int fs_kHz, /* I */
opus_int PacketSize_ms /* I */
)
{
opus_int ret = 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 = SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
}
if( PacketSize_ms <= 10 ) {
psEnc->sCmn.nFramesPerPacket = 1;
psEnc->sCmn.nb_subfr = PacketSize_ms == 10 ? 2 : 1;
psEnc->sCmn.frame_length = silk_SMULBB( PacketSize_ms, fs_kHz );
psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
if( psEnc->sCmn.fs_kHz == 8 ) {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
} else {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
}
} else {
psEnc->sCmn.nFramesPerPacket = silk_DIV32_16( PacketSize_ms, MAX_FRAME_LENGTH_MS );
psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
psEnc->sCmn.frame_length = silk_SMULBB( 20, fs_kHz );
psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
if( psEnc->sCmn.fs_kHz == 8 ) {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
} else {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
}
}
psEnc->sCmn.PacketSize_ms = PacketSize_ms;
psEnc->sCmn.TargetRate_bps = 0; /* trigger new SNR computation */
}
/* Set internal sampling frequency */
silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
silk_assert( psEnc->sCmn.nb_subfr == 2 || psEnc->sCmn.nb_subfr == 4 );
if( psEnc->sCmn.fs_kHz != fs_kHz ) {
/* reset part of the state */
silk_memset( &psEnc->sShape, 0, sizeof( psEnc->sShape ) );
silk_memset( &psEnc->sCmn.sNSQ, 0, sizeof( psEnc->sCmn.sNSQ ) );
silk_memset( psEnc->sCmn.prev_NLSFq_Q15, 0, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
silk_memset( &psEnc->sCmn.sLP.In_LP_State, 0, sizeof( psEnc->sCmn.sLP.In_LP_State ) );
psEnc->sCmn.inputBufIx = 0;
psEnc->sCmn.nFramesEncoded = 0;
psEnc->sCmn.TargetRate_bps = 0; /* trigger new SNR computation */
/* Initialize non-zero parameters */
psEnc->sCmn.prevLag = 100;
psEnc->sCmn.first_frame_after_reset = 1;
psEnc->sShape.LastGainIndex = 10;
psEnc->sCmn.sNSQ.lagPrev = 100;
psEnc->sCmn.sNSQ.prev_gain_Q16 = 65536;
psEnc->sCmn.prevSignalType = TYPE_NO_VOICE_ACTIVITY;
psEnc->sCmn.fs_kHz = fs_kHz;
if( psEnc->sCmn.fs_kHz == 8 ) {
if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
} else {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
}
} else {
if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
} else {
psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
}
}
if( psEnc->sCmn.fs_kHz == 8 || psEnc->sCmn.fs_kHz == 12 ) {
psEnc->sCmn.predictLPCOrder = MIN_LPC_ORDER;
psEnc->sCmn.psNLSF_CB = &silk_NLSF_CB_NB_MB;
} else {
psEnc->sCmn.predictLPCOrder = MAX_LPC_ORDER;
psEnc->sCmn.psNLSF_CB = &silk_NLSF_CB_WB;
}
psEnc->sCmn.subfr_length = SUB_FRAME_LENGTH_MS * fs_kHz;
psEnc->sCmn.frame_length = silk_SMULBB( psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
psEnc->sCmn.ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
psEnc->sCmn.la_pitch = silk_SMULBB( LA_PITCH_MS, fs_kHz );
psEnc->sCmn.max_pitch_lag = silk_SMULBB( 18, fs_kHz );
if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
} else {
psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
}
if( psEnc->sCmn.fs_kHz == 16 ) {
psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
} else if( psEnc->sCmn.fs_kHz == 12 ) {
psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
} else {
psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
}
}
/* Check that settings are valid */
silk_assert( ( psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr ) == psEnc->sCmn.frame_length );
return ret;
}
static opus_int silk_setup_complexity(
silk_encoder_state *psEncC, /* I/O */
opus_int Complexity /* I */
)
{
opus_int ret = 0;
/* Set encoding complexity */
silk_assert( Complexity >= 0 && Complexity <= 10 );
if( Complexity < 1 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MIN_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.8, 16 );
psEncC->pitchEstimationLPCOrder = 6;
psEncC->shapingLPCOrder = 12;
psEncC->la_shape = 3 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 1;
psEncC->useInterpolatedNLSFs = 0;
psEncC->NLSF_MSVQ_Survivors = 2;
psEncC->warping_Q16 = 0;
} else if( Complexity < 2 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MID_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.76, 16 );
psEncC->pitchEstimationLPCOrder = 8;
psEncC->shapingLPCOrder = 14;
psEncC->la_shape = 5 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 1;
psEncC->useInterpolatedNLSFs = 0;
psEncC->NLSF_MSVQ_Survivors = 3;
psEncC->warping_Q16 = 0;
} else if( Complexity < 3 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MIN_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.8, 16 );
psEncC->pitchEstimationLPCOrder = 6;
psEncC->shapingLPCOrder = 12;
psEncC->la_shape = 3 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 2;
psEncC->useInterpolatedNLSFs = 0;
psEncC->NLSF_MSVQ_Survivors = 2;
psEncC->warping_Q16 = 0;
} else if( Complexity < 4 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MID_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.76, 16 );
psEncC->pitchEstimationLPCOrder = 8;
psEncC->shapingLPCOrder = 14;
psEncC->la_shape = 5 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 2;
psEncC->useInterpolatedNLSFs = 0;
psEncC->NLSF_MSVQ_Survivors = 4;
psEncC->warping_Q16 = 0;
} else if( Complexity < 6 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MID_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.74, 16 );
psEncC->pitchEstimationLPCOrder = 10;
psEncC->shapingLPCOrder = 16;
psEncC->la_shape = 5 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 2;
psEncC->useInterpolatedNLSFs = 1;
psEncC->NLSF_MSVQ_Survivors = 6;
psEncC->warping_Q16 = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
} else if( Complexity < 8 ) {
psEncC->pitchEstimationComplexity = SILK_PE_MID_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.72, 16 );
psEncC->pitchEstimationLPCOrder = 12;
psEncC->shapingLPCOrder = 20;
psEncC->la_shape = 5 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = 3;
psEncC->useInterpolatedNLSFs = 1;
psEncC->NLSF_MSVQ_Survivors = 8;
psEncC->warping_Q16 = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
} else {
psEncC->pitchEstimationComplexity = SILK_PE_MAX_COMPLEX;
psEncC->pitchEstimationThreshold_Q16 = SILK_FIX_CONST( 0.7, 16 );
psEncC->pitchEstimationLPCOrder = 16;
psEncC->shapingLPCOrder = 24;
psEncC->la_shape = 5 * psEncC->fs_kHz;
psEncC->nStatesDelayedDecision = MAX_DEL_DEC_STATES;
psEncC->useInterpolatedNLSFs = 1;
psEncC->NLSF_MSVQ_Survivors = 16;
psEncC->warping_Q16 = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
}
/* Do not allow higher pitch estimation LPC order than predict LPC order */
psEncC->pitchEstimationLPCOrder = silk_min_int( psEncC->pitchEstimationLPCOrder, psEncC->predictLPCOrder );
psEncC->shapeWinLength = SUB_FRAME_LENGTH_MS * psEncC->fs_kHz + 2 * psEncC->la_shape;
psEncC->Complexity = Complexity;
silk_assert( psEncC->pitchEstimationLPCOrder <= MAX_FIND_PITCH_LPC_ORDER );
silk_assert( psEncC->shapingLPCOrder <= MAX_SHAPE_LPC_ORDER );
silk_assert( psEncC->nStatesDelayedDecision <= MAX_DEL_DEC_STATES );
silk_assert( psEncC->warping_Q16 <= 32767 );
silk_assert( psEncC->la_shape <= LA_SHAPE_MAX );
silk_assert( psEncC->shapeWinLength <= SHAPE_LPC_WIN_MAX );
return ret;
}
static OPUS_INLINE opus_int silk_setup_LBRR(
silk_encoder_state *psEncC, /* I/O */
const silk_EncControlStruct *encControl /* I */
)
{
opus_int LBRR_in_previous_packet, ret = SILK_NO_ERROR;
LBRR_in_previous_packet = psEncC->LBRR_enabled;
psEncC->LBRR_enabled = encControl->LBRR_coded;
if( psEncC->LBRR_enabled ) {
/* Set gain increase for coding LBRR excitation */
if( LBRR_in_previous_packet == 0 ) {
/* Previous packet did not have LBRR, and was therefore coded at a higher bitrate */
psEncC->LBRR_GainIncreases = 7;
} else {
psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( (opus_int32)psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.4, 16 ) ), 2 );
}
}
return ret;
}