decode_frame.c (7388B)
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 #ifdef ENABLE_OSCE 37 #include "osce.h" 38 #endif 39 40 /****************/ 41 /* Decode frame */ 42 /****************/ 43 opus_int silk_decode_frame( 44 silk_decoder_state *psDec, /* I/O Pointer to Silk decoder state */ 45 ec_dec *psRangeDec, /* I/O Compressor data structure */ 46 opus_int16 pOut[], /* O Pointer to output speech frame */ 47 opus_int32 *pN, /* O Pointer to size of output frame */ 48 opus_int lostFlag, /* I 0: no loss, 1 loss, 2 decode fec */ 49 opus_int condCoding, /* I The type of conditional coding to use */ 50 #ifdef ENABLE_DEEP_PLC 51 LPCNetPLCState *lpcnet, 52 #endif 53 #ifdef ENABLE_OSCE 54 OSCEModel *osce_model, 55 #endif 56 int arch /* I Run-time architecture */ 57 ) 58 { 59 VARDECL( silk_decoder_control, psDecCtrl ); 60 opus_int L, mv_len, ret = 0; 61 SAVE_STACK; 62 63 L = psDec->frame_length; 64 ALLOC( psDecCtrl, 1, silk_decoder_control ); 65 psDecCtrl->LTP_scale_Q14 = 0; 66 67 /* Safety checks */ 68 celt_assert( L > 0 && L <= MAX_FRAME_LENGTH ); 69 70 if( lostFlag == FLAG_DECODE_NORMAL || 71 ( lostFlag == FLAG_DECODE_LBRR && psDec->LBRR_flags[ psDec->nFramesDecoded ] == 1 ) ) 72 { 73 VARDECL( opus_int16, pulses ); 74 #ifdef ENABLE_OSCE 75 opus_int32 ec_start; 76 ec_start = ec_tell(psRangeDec); 77 #endif 78 ALLOC( pulses, (L + SHELL_CODEC_FRAME_LENGTH - 1) & 79 ~(SHELL_CODEC_FRAME_LENGTH - 1), opus_int16 ); 80 /*********************************************/ 81 /* Decode quantization indices of side info */ 82 /*********************************************/ 83 silk_decode_indices( psDec, psRangeDec, psDec->nFramesDecoded, lostFlag, condCoding ); 84 85 /*********************************************/ 86 /* Decode quantization indices of excitation */ 87 /*********************************************/ 88 silk_decode_pulses( psRangeDec, pulses, psDec->indices.signalType, 89 psDec->indices.quantOffsetType, psDec->frame_length ); 90 91 /********************************************/ 92 /* Decode parameters and pulse signal */ 93 /********************************************/ 94 silk_decode_parameters( psDec, psDecCtrl, condCoding ); 95 96 /********************************************************/ 97 /* Run inverse NSQ */ 98 /********************************************************/ 99 silk_decode_core( psDec, psDecCtrl, pOut, pulses, arch ); 100 101 /*************************/ 102 /* Update output buffer. */ 103 /*************************/ 104 celt_assert( psDec->ltp_mem_length >= psDec->frame_length ); 105 mv_len = psDec->ltp_mem_length - psDec->frame_length; 106 silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) ); 107 silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) ); 108 109 #ifdef ENABLE_OSCE 110 /********************************************************/ 111 /* Run SILK enhancer */ 112 /********************************************************/ 113 osce_enhance_frame( osce_model, psDec, psDecCtrl, pOut, ec_tell(psRangeDec) - ec_start, arch ); 114 #endif 115 116 /********************************************************/ 117 /* Update PLC state */ 118 /********************************************************/ 119 silk_PLC( psDec, psDecCtrl, pOut, 0, 120 #ifdef ENABLE_DEEP_PLC 121 lpcnet, 122 #endif 123 arch ); 124 125 psDec->lossCnt = 0; 126 psDec->prevSignalType = psDec->indices.signalType; 127 celt_assert( psDec->prevSignalType >= 0 && psDec->prevSignalType <= 2 ); 128 129 /* A frame has been decoded without errors */ 130 psDec->first_frame_after_reset = 0; 131 } else { 132 /* Handle packet loss by extrapolation */ 133 silk_PLC( psDec, psDecCtrl, pOut, 1, 134 #ifdef ENABLE_DEEP_PLC 135 lpcnet, 136 #endif 137 arch ); 138 139 #ifdef ENABLE_OSCE 140 osce_reset( &psDec->osce, psDec->osce.method ); 141 #endif 142 /*************************/ 143 /* Update output buffer. */ 144 /*************************/ 145 celt_assert( psDec->ltp_mem_length >= psDec->frame_length ); 146 mv_len = psDec->ltp_mem_length - psDec->frame_length; 147 silk_memmove( psDec->outBuf, &psDec->outBuf[ psDec->frame_length ], mv_len * sizeof(opus_int16) ); 148 silk_memcpy( &psDec->outBuf[ mv_len ], pOut, psDec->frame_length * sizeof( opus_int16 ) ); 149 } 150 151 /************************************************/ 152 /* Comfort noise generation / estimation */ 153 /************************************************/ 154 silk_CNG( psDec, psDecCtrl, pOut, L ); 155 156 /****************************************************************/ 157 /* Ensure smooth connection of extrapolated and good frames */ 158 /****************************************************************/ 159 silk_PLC_glue_frames( psDec, pOut, L ); 160 161 /* Update some decoder state variables */ 162 psDec->lagPrev = psDecCtrl->pitchL[ psDec->nb_subfr - 1 ]; 163 164 /* Set output frame length */ 165 *pN = L; 166 167 RESTORE_STACK; 168 return ret; 169 }