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/***********************************************************************
Copyright (c) 2006-2012, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
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
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
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
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 "SKP_Silk_main_FIX.h"
#include "SKP_Silk_tuning_parameters.h"
/****************/
/* Encode frame */
/****************/
SKP_int SKP_Silk_encode_frame_FIX(
SKP_Silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk FIX encoder state */
SKP_uint8 *pCode, /* O Pointer to payload */
SKP_int16 *pnBytesOut, /* I/O Pointer to number of payload bytes */
/* input: max length; output: used */
const SKP_int16 *pIn /* I Pointer to input speech frame */
)
{
SKP_Silk_encoder_control_FIX sEncCtrl;
SKP_int nBytes, ret = 0;
SKP_int16 *x_frame, *res_pitch_frame;
SKP_int16 xfw[ MAX_FRAME_LENGTH ];
SKP_int16 pIn_HP[ MAX_FRAME_LENGTH ];
SKP_int16 res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
SKP_int LBRR_idx, frame_terminator, SNR_dB_Q7;
const SKP_uint16 *FrameTermination_CDF;
/* Low bitrate redundancy parameters */
SKP_uint8 LBRRpayload[ MAX_ARITHM_BYTES ];
SKP_int16 nBytesLBRR;
sEncCtrl.sCmn.Seed = psEnc->sCmn.frameCounter++ & 3;
/**************************************************************/
/* Setup Input Pointers, and insert frame in input buffer */
/*************************************************************/
x_frame = psEnc->x_buf + psEnc->sCmn.frame_length; /* start of frame to encode */
res_pitch_frame = res_pitch + psEnc->sCmn.frame_length; /* start of pitch LPC residual frame */
/****************************/
/* Voice Activity Detection */
/****************************/
ret = SKP_Silk_VAD_GetSA_Q8( &psEnc->sCmn.sVAD, &psEnc->speech_activity_Q8, &SNR_dB_Q7,
sEncCtrl.input_quality_bands_Q15, &sEncCtrl.input_tilt_Q15,
pIn,psEnc->sCmn.frame_length );
/*******************************************/
/* High-pass filtering of the input signal */
/*******************************************/
#if HIGH_PASS_INPUT
/* Variable high-pass filter */
SKP_Silk_HP_variable_cutoff_FIX( psEnc, &sEncCtrl, pIn_HP, pIn );
#else
SKP_memcpy( pIn_HP, pIn, psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
#endif
#if SWITCH_TRANSITION_FILTERING
/* Ensure smooth bandwidth transitions */
SKP_Silk_LP_variable_cutoff( &psEnc->sCmn.sLP, x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, pIn_HP, psEnc->sCmn.frame_length );
#else
SKP_memcpy( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, pIn_HP,psEnc->sCmn.frame_length * sizeof( SKP_int16 ) );
#endif
/*****************************************/
/* Find pitch lags, initial LPC analysis */
/*****************************************/
SKP_Silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame );
/************************/
/* Noise shape analysis */
/************************/
SKP_Silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
/*****************************************/
/* Prefiltering for noise shaper */
/*****************************************/
SKP_Silk_prefilter_FIX( psEnc, &sEncCtrl, xfw, x_frame );
/***************************************************/
/* Find linear prediction coefficients (LPC + LTP) */
/***************************************************/
SKP_Silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch );
/****************************************/
/* Process gains */
/****************************************/
SKP_Silk_process_gains_FIX( psEnc, &sEncCtrl );
/****************************************/
/* Low Bitrate Redundant Encoding */
/****************************************/
nBytesLBRR = MAX_ARITHM_BYTES;
SKP_Silk_LBRR_encode_FIX( psEnc, &sEncCtrl, LBRRpayload, &nBytesLBRR, xfw );
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
SKP_Silk_NSQ_del_dec( &psEnc->sCmn, &sEncCtrl.sCmn, &psEnc->sCmn.sNSQ, xfw,
psEnc->sCmn.q, sEncCtrl.sCmn.NLSFInterpCoef_Q2,
sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.Lambda_Q10,
sEncCtrl.LTP_scale_Q14 );
} else {
SKP_Silk_NSQ( &psEnc->sCmn, &sEncCtrl.sCmn, &psEnc->sCmn.sNSQ, xfw,
psEnc->sCmn.q, sEncCtrl.sCmn.NLSFInterpCoef_Q2,
sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.Lambda_Q10,
sEncCtrl.LTP_scale_Q14 );
}
/**************************************************/
/* Convert speech activity into VAD and DTX flags */
/**************************************************/
if( psEnc->speech_activity_Q8 < SKP_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
psEnc->sCmn.vadFlag = NO_VOICE_ACTIVITY;
psEnc->sCmn.noSpeechCounter++;
if( psEnc->sCmn.noSpeechCounter > NO_SPEECH_FRAMES_BEFORE_DTX ) {
psEnc->sCmn.inDTX = 1;
}
if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NO_SPEECH_FRAMES_BEFORE_DTX ) {
psEnc->sCmn.noSpeechCounter = NO_SPEECH_FRAMES_BEFORE_DTX;
psEnc->sCmn.inDTX = 0;
}
} else {
psEnc->sCmn.noSpeechCounter = 0;
psEnc->sCmn.inDTX = 0;
psEnc->sCmn.vadFlag = VOICE_ACTIVITY;
}
/****************************************/
/* Initialize range coder */
/****************************************/
if( psEnc->sCmn.nFramesInPayloadBuf == 0 ) {
SKP_Silk_range_enc_init( &psEnc->sCmn.sRC );
psEnc->sCmn.nBytesInPayloadBuf = 0;
}
/****************************************/
/* Encode Parameters */
/****************************************/
SKP_Silk_encode_parameters( &psEnc->sCmn, &sEncCtrl.sCmn, &psEnc->sCmn.sRC, psEnc->sCmn.q );
FrameTermination_CDF = SKP_Silk_FrameTermination_CDF;
/****************************************/
/* Update Buffers and State */
/****************************************/
/* Update input buffer */
SKP_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
( psEnc->sCmn.frame_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( SKP_int16 ) );
/* Parameters needed for next frame */
psEnc->sCmn.prev_sigtype = sEncCtrl.sCmn.sigtype;
psEnc->sCmn.prevLag = sEncCtrl.sCmn.pitchL[ NB_SUBFR - 1];
psEnc->sCmn.first_frame_after_reset = 0;
if( psEnc->sCmn.sRC.error ) {
/* Encoder returned error: clear payload buffer */
psEnc->sCmn.nFramesInPayloadBuf = 0;
} else {
psEnc->sCmn.nFramesInPayloadBuf++;
}
/****************************************/
/* Finalize payload and copy to output */
/****************************************/
if( psEnc->sCmn.nFramesInPayloadBuf * FRAME_LENGTH_MS >= psEnc->sCmn.PacketSize_ms ) {
LBRR_idx = ( psEnc->sCmn.oldest_LBRR_idx + 1 ) & LBRR_IDX_MASK;
/* Check if FEC information should be added */
frame_terminator = SKP_SILK_LAST_FRAME;
if( psEnc->sCmn.LBRR_buffer[ LBRR_idx ].usage == SKP_SILK_ADD_LBRR_TO_PLUS1 ) {
frame_terminator = SKP_SILK_LBRR_VER1;
}
if( psEnc->sCmn.LBRR_buffer[ psEnc->sCmn.oldest_LBRR_idx ].usage == SKP_SILK_ADD_LBRR_TO_PLUS2 ) {
frame_terminator = SKP_SILK_LBRR_VER2;
LBRR_idx = psEnc->sCmn.oldest_LBRR_idx;
}
/* Add the frame termination info to stream */
SKP_Silk_range_encoder( &psEnc->sCmn.sRC, frame_terminator, FrameTermination_CDF );
/* Payload length so far */
SKP_Silk_range_coder_get_length( &psEnc->sCmn.sRC, &nBytes );
/* Check that there is enough space in external output buffer, and move data */
if( *pnBytesOut >= nBytes ) {
SKP_Silk_range_enc_wrap_up( &psEnc->sCmn.sRC );
SKP_memcpy( pCode, psEnc->sCmn.sRC.buffer, nBytes * sizeof( SKP_uint8 ) );
if( frame_terminator > SKP_SILK_MORE_FRAMES &&
*pnBytesOut >= nBytes + psEnc->sCmn.LBRR_buffer[ LBRR_idx ].nBytes ) {
/* Get old packet and add to payload. */
SKP_memcpy( &pCode[ nBytes ],
psEnc->sCmn.LBRR_buffer[ LBRR_idx ].payload,
psEnc->sCmn.LBRR_buffer[ LBRR_idx ].nBytes * sizeof( SKP_uint8 ) );
nBytes += psEnc->sCmn.LBRR_buffer[ LBRR_idx ].nBytes;
}
*pnBytesOut = nBytes;
/* Update FEC buffer */
SKP_memcpy( psEnc->sCmn.LBRR_buffer[ psEnc->sCmn.oldest_LBRR_idx ].payload, LBRRpayload,
nBytesLBRR * sizeof( SKP_uint8 ) );
psEnc->sCmn.LBRR_buffer[ psEnc->sCmn.oldest_LBRR_idx ].nBytes = nBytesLBRR;
/* The line below describes how FEC should be used */
psEnc->sCmn.LBRR_buffer[ psEnc->sCmn.oldest_LBRR_idx ].usage = sEncCtrl.sCmn.LBRR_usage;
psEnc->sCmn.oldest_LBRR_idx = ( psEnc->sCmn.oldest_LBRR_idx + 1 ) & LBRR_IDX_MASK;
} else {
/* Not enough space: Payload will be discarded */
*pnBytesOut = 0;
nBytes = 0;
ret = SKP_SILK_ENC_PAYLOAD_BUF_TOO_SHORT;
}
/* Reset the number of frames in payload buffer */
psEnc->sCmn.nFramesInPayloadBuf = 0;
} else {
/* No payload this time */
*pnBytesOut = 0;
/* Encode that more frames follows */
frame_terminator = SKP_SILK_MORE_FRAMES;
SKP_Silk_range_encoder( &psEnc->sCmn.sRC, frame_terminator, FrameTermination_CDF );
/* Payload length so far */
SKP_Silk_range_coder_get_length( &psEnc->sCmn.sRC, &nBytes );
}
/* Check for arithmetic coder errors */
if( psEnc->sCmn.sRC.error ) {
ret = SKP_SILK_ENC_INTERNAL_ERROR;
}
/* Simulate number of ms buffered in channel because of exceeding TargetRate */
SKP_assert( ( 8 * 1000 * ( (SKP_int64)nBytes - (SKP_int64)psEnc->sCmn.nBytesInPayloadBuf ) ) ==
SKP_SAT32( 8 * 1000 * ( (SKP_int64)nBytes - (SKP_int64)psEnc->sCmn.nBytesInPayloadBuf ) ) );
SKP_assert( psEnc->sCmn.TargetRate_bps > 0 );
psEnc->BufferedInChannel_ms += SKP_DIV32( 8 * 1000 * ( nBytes - psEnc->sCmn.nBytesInPayloadBuf ), psEnc->sCmn.TargetRate_bps );
psEnc->BufferedInChannel_ms -= FRAME_LENGTH_MS;
psEnc->BufferedInChannel_ms = SKP_LIMIT_int( psEnc->BufferedInChannel_ms, 0, 100 );
psEnc->sCmn.nBytesInPayloadBuf = nBytes;
if( psEnc->speech_activity_Q8 > SKP_FIX_CONST( WB_DETECT_ACTIVE_SPEECH_LEVEL_THRES, 8 ) ) {
psEnc->sCmn.sSWBdetect.ActiveSpeech_ms = SKP_ADD_POS_SAT32( psEnc->sCmn.sSWBdetect.ActiveSpeech_ms, FRAME_LENGTH_MS );
}
return( ret );
}
/* Low BitRate Redundancy encoding functionality. Reuse all parameters but encode residual with lower bitrate */
void SKP_Silk_LBRR_encode_FIX(
SKP_Silk_encoder_state_FIX *psEnc, /* I/O Pointer to Silk encoder state */
SKP_Silk_encoder_control_FIX *psEncCtrl, /* I/O Pointer to Silk encoder control struct */
SKP_uint8 *pCode, /* O Pointer to payload */
SKP_int16 *pnBytesOut, /* I/O Pointer to number of payload bytes */
SKP_int16 xfw[] /* I Input signal */
)
{
SKP_int TempGainsIndices[ NB_SUBFR ], frame_terminator;
SKP_int nBytes, nFramesInPayloadBuf;
SKP_int32 TempGains_Q16[ NB_SUBFR ];
SKP_int typeOffset, LTP_scaleIndex, Rate_only_parameters = 0;
/*******************************************/
/* Control use of inband LBRR */
/*******************************************/
SKP_Silk_LBRR_ctrl_FIX( psEnc, &psEncCtrl->sCmn );
if( psEnc->sCmn.LBRR_enabled ) {
/* Save original gains */
SKP_memcpy( TempGainsIndices, psEncCtrl->sCmn.GainsIndices, NB_SUBFR * sizeof( SKP_int ) );
SKP_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, NB_SUBFR * sizeof( SKP_int32 ) );
typeOffset = psEnc->sCmn.typeOffsetPrev; // Temp save as cannot be overwritten
LTP_scaleIndex = psEncCtrl->sCmn.LTP_scaleIndex;
/* Set max rate where quant signal is encoded */
if( psEnc->sCmn.fs_kHz == 8 ) {
Rate_only_parameters = 13500;
} else if( psEnc->sCmn.fs_kHz == 12 ) {
Rate_only_parameters = 15500;
} else if( psEnc->sCmn.fs_kHz == 16 ) {
Rate_only_parameters = 17500;
} else if( psEnc->sCmn.fs_kHz == 24 ) {
Rate_only_parameters = 19500;
} else {
SKP_assert( 0 );
}
if( psEnc->sCmn.Complexity > 0 && psEnc->sCmn.TargetRate_bps > Rate_only_parameters ) {
if( psEnc->sCmn.nFramesInPayloadBuf == 0 ) {
/* First frame in packet; copy everything */
SKP_memcpy( &psEnc->sCmn.sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( SKP_Silk_nsq_state ) );
psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
/* Increase Gains to get target LBRR rate */
psEncCtrl->sCmn.GainsIndices[ 0 ] = psEncCtrl->sCmn.GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases;
psEncCtrl->sCmn.GainsIndices[ 0 ] = SKP_LIMIT_int( psEncCtrl->sCmn.GainsIndices[ 0 ], 0, N_LEVELS_QGAIN - 1 );
}
/* Decode to get gains in sync with decoder */
/* Overwrite unquantized gains with quantized gains */
SKP_Silk_gains_dequant( psEncCtrl->Gains_Q16, psEncCtrl->sCmn.GainsIndices,
&psEnc->sCmn.LBRRprevLastGainIndex, psEnc->sCmn.nFramesInPayloadBuf );
/*****************************************/
/* Noise shaping quantization */
/*****************************************/
if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
SKP_Silk_NSQ_del_dec( &psEnc->sCmn, &psEncCtrl->sCmn, &psEnc->sCmn.sNSQ_LBRR, xfw, psEnc->sCmn.q_LBRR,
psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
psEncCtrl->Gains_Q16, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
} else {
SKP_Silk_NSQ( &psEnc->sCmn, &psEncCtrl->sCmn, &psEnc->sCmn.sNSQ_LBRR, xfw, psEnc->sCmn.q_LBRR,
psEncCtrl->sCmn.NLSFInterpCoef_Q2, psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
psEncCtrl->Gains_Q16, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
}
} else {
SKP_memset( psEnc->sCmn.q_LBRR, 0, psEnc->sCmn.frame_length * sizeof( SKP_int8 ) );
psEncCtrl->sCmn.LTP_scaleIndex = 0;
}
/****************************************/
/* Initialize arithmetic coder */
/****************************************/
if( psEnc->sCmn.nFramesInPayloadBuf == 0 ) {
SKP_Silk_range_enc_init( &psEnc->sCmn.sRC_LBRR );
psEnc->sCmn.nBytesInPayloadBuf = 0;
}
/****************************************/
/* Encode Parameters */
/****************************************/
SKP_Silk_encode_parameters( &psEnc->sCmn, &psEncCtrl->sCmn,
&psEnc->sCmn.sRC_LBRR, psEnc->sCmn.q_LBRR );
if( psEnc->sCmn.sRC_LBRR.error ) {
/* Encoder returned error: clear payload buffer */
nFramesInPayloadBuf = 0;
} else {
nFramesInPayloadBuf = psEnc->sCmn.nFramesInPayloadBuf + 1;
}
/****************************************/
/* Finalize payload and copy to output */
/****************************************/
if( SKP_SMULBB( nFramesInPayloadBuf, FRAME_LENGTH_MS ) >= psEnc->sCmn.PacketSize_ms ) {
/* Check if FEC information should be added */
frame_terminator = SKP_SILK_LAST_FRAME;
/* Add the frame termination info to stream */
SKP_Silk_range_encoder( &psEnc->sCmn.sRC_LBRR, frame_terminator, SKP_Silk_FrameTermination_CDF );
/* Payload length so far */
SKP_Silk_range_coder_get_length( &psEnc->sCmn.sRC_LBRR, &nBytes );
/* Check that there is enough space in external output buffer and move data */
if( *pnBytesOut >= nBytes ) {
SKP_Silk_range_enc_wrap_up( &psEnc->sCmn.sRC_LBRR );
SKP_memcpy( pCode, psEnc->sCmn.sRC_LBRR.buffer, nBytes * sizeof( SKP_uint8 ) );
*pnBytesOut = nBytes;
} else {
/* Not enough space: payload will be discarded */
*pnBytesOut = 0;
SKP_assert( 0 );
}
} else {
/* No payload this time */
*pnBytesOut = 0;
/* Encode that more frames follows */
frame_terminator = SKP_SILK_MORE_FRAMES;
SKP_Silk_range_encoder( &psEnc->sCmn.sRC_LBRR, frame_terminator, SKP_Silk_FrameTermination_CDF );
}
/* Restore original Gains */
SKP_memcpy( psEncCtrl->sCmn.GainsIndices, TempGainsIndices, NB_SUBFR * sizeof( SKP_int ) );
SKP_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, NB_SUBFR * sizeof( SKP_int32 ) );
/* Restore LTP scale index and typeoffset */
psEncCtrl->sCmn.LTP_scaleIndex = LTP_scaleIndex;
psEnc->sCmn.typeOffsetPrev = typeOffset;
}
}