Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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 | ) |
| 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 | } |