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