369 lines
19 KiB
C
369 lines
19 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, 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 Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
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 "opus/opus_config.h"
|
|
|
|
#include "opus/silk/float/main_FLP.h"
|
|
#include "opus/silk/tuning_parameters.h"
|
|
|
|
/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
|
|
static OPUS_INLINE void silk_LBRR_encode_FLP(
|
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
|
|
silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
|
|
const silk_float xfw[], /* I Input signal */
|
|
opus_int condCoding /* I The type of conditional coding used so far for this frame */
|
|
);
|
|
|
|
void silk_encode_do_VAD_FLP(
|
|
silk_encoder_state_FLP *psEnc /* I/O Encoder state FLP */
|
|
)
|
|
{
|
|
/****************************/
|
|
/* Voice Activity Detection */
|
|
/****************************/
|
|
silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch );
|
|
|
|
/**************************************************/
|
|
/* Convert speech activity into VAD and DTX flags */
|
|
/**************************************************/
|
|
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;
|
|
}
|
|
}
|
|
|
|
/****************/
|
|
/* Encode frame */
|
|
/****************/
|
|
opus_int silk_encode_frame_FLP(
|
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
|
|
opus_int32 *pnBytesOut, /* O Number of payload bytes; */
|
|
ec_enc *psRangeEnc, /* I/O compressor data structure */
|
|
opus_int condCoding, /* I The type of conditional coding to use */
|
|
opus_int maxBits, /* I If > 0: maximum number of output bits */
|
|
opus_int useCBR /* I Flag to force constant-bitrate operation */
|
|
)
|
|
{
|
|
silk_encoder_control_FLP sEncCtrl;
|
|
opus_int i, iter, maxIter, found_upper, found_lower, ret = 0;
|
|
silk_float *x_frame, *res_pitch_frame;
|
|
silk_float xfw[ MAX_FRAME_LENGTH ];
|
|
silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
|
|
ec_enc sRangeEnc_copy, sRangeEnc_copy2;
|
|
silk_nsq_state sNSQ_copy, sNSQ_copy2;
|
|
opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
|
|
opus_int32 gainsID, gainsID_lower, gainsID_upper;
|
|
opus_int16 gainMult_Q8;
|
|
opus_int16 ec_prevLagIndex_copy;
|
|
opus_int ec_prevSignalType_copy;
|
|
opus_int8 LastGainIndex_copy2;
|
|
opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
|
|
opus_uint8 ec_buf_copy[ 1275 ];
|
|
|
|
/* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
|
|
LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
|
|
|
|
psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
|
|
|
|
/**************************************************************/
|
|
/* Set up 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 */
|
|
|
|
/***************************************/
|
|
/* 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 */
|
|
/*******************************************/
|
|
silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, 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;
|
|
}
|
|
|
|
if( !psEnc->sCmn.prefillFlag ) {
|
|
/*****************************************/
|
|
/* Find pitch lags, initial LPC analysis */
|
|
/*****************************************/
|
|
silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
|
|
|
|
/************************/
|
|
/* Noise shape analysis */
|
|
/************************/
|
|
silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
|
|
|
|
/***************************************************/
|
|
/* Find linear prediction coefficients (LPC + LTP) */
|
|
/***************************************************/
|
|
silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding );
|
|
|
|
/****************************************/
|
|
/* Process gains */
|
|
/****************************************/
|
|
silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding );
|
|
|
|
/*****************************************/
|
|
/* Prefiltering for noise shaper */
|
|
/*****************************************/
|
|
silk_prefilter_FLP( psEnc, &sEncCtrl, xfw, x_frame );
|
|
|
|
/****************************************/
|
|
/* Low Bitrate Redundant Encoding */
|
|
/****************************************/
|
|
silk_LBRR_encode_FLP( psEnc, &sEncCtrl, xfw, condCoding );
|
|
|
|
/* Loop over quantizer and entroy coding to control bitrate */
|
|
maxIter = 6;
|
|
gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
|
|
found_lower = 0;
|
|
found_upper = 0;
|
|
gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
|
|
gainsID_lower = -1;
|
|
gainsID_upper = -1;
|
|
/* Copy part of the input state */
|
|
silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
|
|
silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
|
|
seed_copy = psEnc->sCmn.indices.Seed;
|
|
ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
|
|
ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
|
|
for( iter = 0; ; iter++ ) {
|
|
if( gainsID == gainsID_lower ) {
|
|
nBits = nBits_lower;
|
|
} else if( gainsID == gainsID_upper ) {
|
|
nBits = nBits_upper;
|
|
} else {
|
|
/* Restore part of the input state */
|
|
if( iter > 0 ) {
|
|
silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
|
|
silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) );
|
|
psEnc->sCmn.indices.Seed = seed_copy;
|
|
psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
|
|
psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
|
|
}
|
|
|
|
/*****************************************/
|
|
/* Noise shaping quantization */
|
|
/*****************************************/
|
|
silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, xfw );
|
|
|
|
/****************************************/
|
|
/* Encode Parameters */
|
|
/****************************************/
|
|
silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
|
|
|
|
/****************************************/
|
|
/* Encode Excitation Signal */
|
|
/****************************************/
|
|
silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
|
|
psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
|
|
|
|
nBits = ec_tell( psRangeEnc );
|
|
|
|
if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( iter == maxIter ) {
|
|
if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
|
|
/* Restore output state from earlier iteration that did meet the bitrate budget */
|
|
silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
|
|
silk_assert( sRangeEnc_copy2.offs <= 1275 );
|
|
silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
|
|
silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) );
|
|
psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if( nBits > maxBits ) {
|
|
if( found_lower == 0 && iter >= 2 ) {
|
|
/* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
|
|
sEncCtrl.Lambda *= 1.5f;
|
|
found_upper = 0;
|
|
gainsID_upper = -1;
|
|
} else {
|
|
found_upper = 1;
|
|
nBits_upper = nBits;
|
|
gainMult_upper = gainMult_Q8;
|
|
gainsID_upper = gainsID;
|
|
}
|
|
} else if( nBits < maxBits - 5 ) {
|
|
found_lower = 1;
|
|
nBits_lower = nBits;
|
|
gainMult_lower = gainMult_Q8;
|
|
if( gainsID != gainsID_lower ) {
|
|
gainsID_lower = gainsID;
|
|
/* Copy part of the output state */
|
|
silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
|
|
silk_assert( psRangeEnc->offs <= 1275 );
|
|
silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
|
|
silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
|
|
LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
|
|
}
|
|
} else {
|
|
/* Within 5 bits of budget: close enough */
|
|
break;
|
|
}
|
|
|
|
if( ( found_lower & found_upper ) == 0 ) {
|
|
/* Adjust gain according to high-rate rate/distortion curve */
|
|
opus_int32 gain_factor_Q16;
|
|
gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) );
|
|
gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) );
|
|
if( nBits > maxBits ) {
|
|
gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) );
|
|
}
|
|
gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 );
|
|
} else {
|
|
/* Adjust gain by interpolating */
|
|
gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower );
|
|
/* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
|
|
if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
|
|
gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
|
|
} else
|
|
if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
|
|
gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
|
|
}
|
|
}
|
|
|
|
for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
|
|
pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 );
|
|
}
|
|
|
|
/* Quantize gains */
|
|
psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
|
|
silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
|
|
&psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
|
|
|
|
/* Unique identifier of gains vector */
|
|
gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
|
|
|
|
/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
|
|
for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
|
|
sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Update input buffer */
|
|
silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
|
|
( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) );
|
|
|
|
/* Exit without entropy coding */
|
|
if( psEnc->sCmn.prefillFlag ) {
|
|
/* No payload */
|
|
*pnBytesOut = 0;
|
|
return ret;
|
|
}
|
|
|
|
/* Parameters needed for next frame */
|
|
psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
|
|
psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
|
|
|
|
/****************************************/
|
|
/* Finalize payload */
|
|
/****************************************/
|
|
psEnc->sCmn.first_frame_after_reset = 0;
|
|
/* Payload size */
|
|
*pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */
|
|
static OPUS_INLINE void silk_LBRR_encode_FLP(
|
|
silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
|
|
silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
|
|
const silk_float xfw[], /* I Input signal */
|
|
opus_int condCoding /* I The type of conditional coding used so far for this frame */
|
|
)
|
|
{
|
|
opus_int k;
|
|
opus_int32 Gains_Q16[ MAX_NB_SUBFR ];
|
|
silk_float TempGains[ 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 */
|
|
silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
|
|
silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
|
|
|
|
/* Save original gains */
|
|
silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
|
|
|
|
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 ] += psEnc->sCmn.LBRR_GainIncreases;
|
|
psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
|
|
}
|
|
|
|
/* Decode to get gains in sync with decoder */
|
|
silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
|
|
&psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, 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 ] * ( 1.0f / 65536.0f );
|
|
}
|
|
|
|
/*****************************************/
|
|
/* Noise shaping quantization */
|
|
/*****************************************/
|
|
silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR,
|
|
psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw );
|
|
|
|
/* Restore original gains */
|
|
silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
|
|
}
|
|
}
|