1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/decode_frame.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,128 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +#include "stack_alloc.h"
1.37 +#include "PLC.h"
1.38 +
1.39 +/****************/
1.40 +/* Decode frame */
1.41 +/****************/
1.42 +opus_int silk_decode_frame(
1.43 + silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */
1.44 + ec_dec *psRangeDec, /* I/O Compressor data structure */
1.45 + opus_int16 pOut[], /* O Pointer to output speech frame */
1.46 + opus_int32 *pN, /* O Pointer to size of output frame */
1.47 + opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */
1.48 + opus_int condCoding /* I The type of conditional coding to use */
1.49 +)
1.50 +{
1.51 + VARDECL( silk_decoder_control, psDecCtrl );
1.52 + opus_int L, mv_len, ret = 0;
1.53 + VARDECL( opus_int, pulses );
1.54 + SAVE_STACK;
1.55 +
1.56 + L = psDec->frame_length;
1.57 + ALLOC( psDecCtrl, 1, silk_decoder_control );
1.58 + ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
1.59 + ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int );
1.60 + psDecCtrl->LTP_scale_Q14 = 0;
1.61 +
1.62 + /* Safety checks */
1.63 + silk_assert( L > 0 && L <= MAX_FRAME_LENGTH );
1.64 +
1.65 + if( lostFlag == FLAG_DECODE_NORMAL ||
1.66 + ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
1.67 + {
1.68 + /*********************************************/
1.69 + /* Decode quantization indices of side info */
1.70 + /*********************************************/
1.71 + silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
1.72 +
1.73 + /*********************************************/
1.74 + /* Decode quantization indices of excitation */
1.75 + /*********************************************/
1.76 + silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
1.77 + psDec->indices.quantOffsetType, psDec->frame_length );
1.78 +
1.79 + /********************************************/
1.80 + /* Decode parameters and pulse signal */
1.81 + /********************************************/
1.82 + silk_decode_parameters( psDec, psDecCtrl, condCoding );
1.83 +
1.84 + /********************************************************/
1.85 + /* Run inverse NSQ */
1.86 + /********************************************************/
1.87 + silk_decode_core( psDec, psDecCtrl, pOut, pulses );
1.88 +
1.89 + /********************************************************/
1.90 + /* Update PLC state */
1.91 + /********************************************************/
1.92 + silk_PLC( psDec, psDecCtrl, pOut, 0 );
1.93 +
1.94 + psDec->lossCnt = 0;
1.95 + psDec->prevSignalType = psDec->indices.signalType;
1.96 + silk_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
1.97 +
1.98 + /* A frame has been decoded without errors */
1.99 + psDec->first_frame_after_reset = 0;
1.100 + } else {
1.101 + /* Handle packet loss by extrapolation */
1.102 + silk_PLC( psDec, psDecCtrl, pOut, 1 );
1.103 + }
1.104 +
1.105 + /*************************/
1.106 + /* Update output buffer. */
1.107 + /*************************/
1.108 + silk_assert( psDec->ltp_mem_length >= psDec->frame_length );
1.109 + mv_len = psDec->ltp_mem_length - psDec->frame_length;
1.110 + silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
1.111 + silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
1.112 +
1.113 + /****************************************************************/
1.114 + /* Ensure smooth connection of extrapolated and good frames */
1.115 + /****************************************************************/
1.116 + silk_PLC_glue_frames( psDec, pOut, L );
1.117 +
1.118 + /************************************************/
1.119 + /* Comfort noise generation / estimation */
1.120 + /************************************************/
1.121 + silk_CNG( psDec, psDecCtrl, pOut, L );
1.122 +
1.123 + /* Update some decoder state variables */
1.124 + psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
1.125 +
1.126 + /* Set output frame length */
1.127 + *pN = L;
1.128 +
1.129 + RESTORE_STACK;
1.130 + return ret;
1.131 +}
