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 celt_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 celt_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 psDec->indices.signalType = psDec->prevSignalType; 101 silk_PLC( psDec, psDecCtrl, pOut, 1, arch ); 102 } 103 104 /*************************/ 105 /* Update output buffer. */ 106 /*************************/ 107 celt_assert( psDec->ltp_mem_length >= psDec->frame_length ); 108 mv_len = psDec->ltp_mem_length - psDec->frame_length; 109 silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) ); 110 silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) ); 111 112 /************************************************/ 113 /* Comfort noise generation / estimation */ 114 /************************************************/ 115 silk_CNG( psDec, psDecCtrl, pOut, L ); 116 117 /****************************************************************/ 118 /* Ensure smooth connection of extrapolated and good frames */ 119 /****************************************************************/ 120 silk_PLC_glue_frames( psDec, pOut, L ); 121 122 /* Update some decoder state variables */ 123 psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ]; 124 125 /* Set output frame length */ 126 *pN = L; 127 128 RESTORE_STACK; 129 return ret; 130 } 131
