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comparison: media/libopus/silk/decode_frame.c
media/libopus/silk/decode_frame.c
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| 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 ) | |
| 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 } |
