ref: 9edde42690a11afea6681275411d2c5f16484ea4
dir: /silk/SKP_Silk_decode_frame.c/
/***********************************************************************
Copyright (c) 2006-2011, 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
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(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.h"
#include "SKP_Silk_PLC.h"
/****************/
/* Decode frame */
/****************/
SKP_int SKP_Silk_decode_frame(
SKP_Silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
ec_dec *psRangeDec, /* I/O Compressor data structure */
SKP_int16 pOut[], /* O Pointer to output speech frame */
SKP_int32 *pN, /* O Pointer to size of output frame */
SKP_int lostFlag /* I 0: no loss, 1 loss, 2 decode fec */
)
{
SKP_Silk_decoder_control sDecCtrl;
SKP_int L, mv_len, ret = 0;
SKP_int pulses[ MAX_FRAME_LENGTH ];
TIC(DECODE_FRAME)
L = psDec->frame_length;
sDecCtrl.LTP_scale_Q14 = 0;
/* Safety checks */
SKP_assert( L > 0 && L <= MAX_FRAME_LENGTH );
if( lostFlag == FLAG_DECODE_NORMAL ||
( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
{
/*********************************************/
/* Decode quantization indices of side info */
/*********************************************/
TIC(decode_indices)
SKP_Silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag );
TOC(decode_indices)
/*********************************************/
/* Decode quantization indices of excitation */
/*********************************************/
TIC(decode_pulses)
SKP_Silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
psDec->indices.quantOffsetType, psDec->frame_length );
TOC(decode_pulses)
/********************************************/
/* Decode parameters and pulse signal */
/********************************************/
TIC(decode_params)
SKP_Silk_decode_parameters( psDec, &sDecCtrl );
TOC(decode_params)
/* Update length. Sampling frequency may have changed */
L = psDec->frame_length;
/********************************************************/
/* Run inverse NSQ */
/********************************************************/
TIC(decode_core)
SKP_Silk_decode_core( psDec, &sDecCtrl, pOut, pulses );
TOC(decode_core)
/********************************************************/
/* Update PLC state */
/********************************************************/
SKP_Silk_PLC( psDec, &sDecCtrl, pOut, L, 0 );
psDec->lossCnt = 0;
psDec->prevSignalType = psDec->indices.signalType;
SKP_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
/* A frame has been decoded without errors */
psDec->first_frame_after_reset = 0;
} else {
/* Handle packet loss by extrapolation */
SKP_Silk_PLC( psDec, &sDecCtrl, pOut, L, 1 );
}
/*************************/
/* Update output buffer. */
/*************************/
SKP_assert( psDec->ltp_mem_length >= psDec->frame_length );
mv_len = psDec->ltp_mem_length - psDec->frame_length;
SKP_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(SKP_int16) );
SKP_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( SKP_int16 ) );
/****************************************************************/
/* Ensure smooth connection of extrapolated and good frames */
/****************************************************************/
SKP_Silk_PLC_glue_frames( psDec, &sDecCtrl, pOut, L );
/************************************************/
/* Comfort noise generation / estimation */
/************************************************/
SKP_Silk_CNG( psDec, &sDecCtrl, pOut, L );
/* Update some decoder state variables */
psDec->lagPrev = sDecCtrl.pitchL[ psDec->nb_subfr - 1 ];
psDec->nFramesDecoded++;
/* Set output frame length */
*pN = L;
TOC(DECODE_FRAME)
return ret;
}