Home | History | Annotate | Download | only in silk 
      1 /***********************************************************************
      2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
      3 Redistribution and use in source and binary forms, with or without
      4 modification, are permitted provided that the following conditions
      5 are met:
      6 - Redistributions of source code must retain the above copyright notice,
      7 this list of conditions and the following disclaimer.
      8 - Redistributions in binary form must reproduce the above copyright
      9 notice, this list of conditions and the following disclaimer in the
     10 documentation and/or other materials provided with the distribution.
     11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
     12 names of specific contributors, may be used to endorse or promote
     13 products derived from this software without specific prior written
     14 permission.
     15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
     19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25 POSSIBILITY OF SUCH DAMAGE.
     26 ***********************************************************************/
     27 
     28 #ifdef HAVE_CONFIG_H
     29 #include "config.h"
     30 #endif
     31 
     32 #include "main.h"
     33 #include "stack_alloc.h"
     34 #include "PLC.h"
     35 
     36 /****************/
     37 /* Decode frame */
     38 /****************/
     39 opus_int silk_decode_frame(
     40     silk_decoder_state          *psDec,                         /* I/O  Pointer to Silk decoder state               */
     41     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
     42     opus_int16                  pOut[],                         /* O    Pointer to output speech frame              */
     43     opus_int32                  *pN,                            /* O    Pointer to size of output frame             */
     44     opus_int                    lostFlag,                       /* I    0: no loss, 1 loss, 2 decode fec            */
     45     opus_int                    condCoding,                     /* I    The type of conditional coding to use       */
     46     int                         arch                            /* I    Run-time architecture                       */
     47 )
     48 {
     49     VARDECL( silk_decoder_control, psDecCtrl );
     50     opus_int         L, mv_len, ret = 0;
     51     SAVE_STACK;
     52 
     53     L = psDec->frame_length;
     54     ALLOC( psDecCtrl, 1, silk_decoder_control );
     55     psDecCtrl->LTP_scale_Q14 = 0;
     56 
     57     /* Safety checks */
     58     silk_assert( L > 0 && L <= MAX_FRAME_LENGTH );
     59 
     60     if(   lostFlag == FLAG_DECODE_NORMAL ||
     61         ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) )
     62     {
     63         VARDECL( opus_int16, pulses );
     64         ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) &
     65                        ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int16 );
     66         /*********************************************/
     67         /* Decode quantization indices of side info  */
     68         /*********************************************/
     69         silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding );
     70 
     71         /*********************************************/
     72         /* Decode quantization indices of excitation */
     73         /*********************************************/
     74         silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType,
     75                 psDec->indices.quantOffsetType, psDec->frame_length );
     76 
     77         /********************************************/
     78         /* Decode parameters and pulse signal       */
     79         /********************************************/
     80         silk_decode_parameters( psDec, psDecCtrl, condCoding );
     81 
     82         /********************************************************/
     83         /* Run inverse NSQ                                      */
     84         /********************************************************/
     85         silk_decode_core( psDec, psDecCtrl, pOut, pulses, arch );
     86 
     87         /********************************************************/
     88         /* Update PLC state                                     */
     89         /********************************************************/
     90         silk_PLC( psDec, psDecCtrl, pOut, 0, arch );
     91 
     92         psDec->lossCnt = 0;
     93         psDec->prevSignalType = psDec->indices.signalType;
     94         silk_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 );
     95 
     96         /* A frame has been decoded without errors */
     97         psDec->first_frame_after_reset = 0;
     98     } else {
     99         /* Handle packet loss by extrapolation */
    100         silk_PLC( psDec, psDecCtrl, pOut, 1, arch );
    101     }
    102 
    103     /*************************/
    104     /* Update output buffer. */
    105     /*************************/
    106     silk_assert( psDec->ltp_mem_length >= psDec->frame_length );
    107     mv_len = psDec->ltp_mem_length - psDec->frame_length;
    108     silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) );
    109     silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) );
    110 
    111     /************************************************/
    112     /* Comfort noise generation / estimation        */
    113     /************************************************/
    114     silk_CNG( psDec, psDecCtrl, pOut, L );
    115 
    116     /****************************************************************/
    117     /* Ensure smooth connection of extrapolated and good frames     */
    118     /****************************************************************/
    119     silk_PLC_glue_frames( psDec, pOut, L );
    120 
    121     /* Update some decoder state variables */
    122     psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ];
    123 
    124     /* Set output frame length */
    125     *pN = L;
    126 
    127     RESTORE_STACK;
    128     return ret;
    129 }
    130